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FFmpeg/libavcodec/dcadec.c

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  1. /*

  2.  * DCA compatible decoder

  3.  * Copyright (C) 2004 Gildas Bazin

  4.  * Copyright (C) 2004 Benjamin Zores

  5.  * Copyright (C) 2006 Benjamin Larsson

  6.  * Copyright (C) 2007 Konstantin Shishkov

  7.  *

  8.  * This file is part of FFmpeg.

  9.  *

  10.  * FFmpeg is free software; you can redistribute it and/or

  11.  * modify it under the terms of the GNU Lesser General Public

  12.  * License as published by the Free Software Foundation; either

  13.  * version 2.1 of the License, or (at your option) any later version.

  14.  *

  15.  * FFmpeg is distributed in the hope that it will be useful,

  16.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  17.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  18.  * Lesser General Public License for more details.

  19.  *

  20.  * You should have received a copy of the GNU Lesser General Public

  21.  * License along with FFmpeg; if not, write to the Free Software

  22.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  23.  */

  24. 

  25. #include <math.h>

  26. #include <stddef.h>

  27. #include <stdio.h>

  28. 

  29. #include "libavutil/channel_layout.h"

  30. #include "libavutil/common.h"

  31. #include "libavutil/float_dsp.h"

  32. #include "libavutil/internal.h"

  33. #include "libavutil/intreadwrite.h"

  34. #include "libavutil/mathematics.h"

  35. #include "libavutil/opt.h"

  36. #include "libavutil/samplefmt.h"

  37. #include "avcodec.h"

  38. #include "fft.h"

  39. #include "get_bits.h"

  40. #include "dcadata.h"

  41. #include "dcahuff.h"

  42. #include "dca.h"

  43. #include "mathops.h"

  44. #include "synth_filter.h"

  45. #include "dcadsp.h"

  46. #include "fmtconvert.h"

  47. #include "internal.h"

  48. 

  49. #if ARCH_ARM

  50. #   include "arm/dca.h"

  51. #endif

  52. 

  53. //#define TRACE

  54. 

  55. #define DCA_PRIM_CHANNELS_MAX  (7)

  56. #define DCA_ABITS_MAX         (32)      /* Should be 28 */

  57. #define DCA_SUBSUBFRAMES_MAX   (4)

  58. #define DCA_SUBFRAMES_MAX     (16)

  59. #define DCA_BLOCKS_MAX        (16)

  60. #define DCA_LFE_MAX            (3)

  61. #define DCA_CHSETS_MAX         (4)

  62. #define DCA_CHSET_CHANS_MAX    (8)

  63. 

  64. enum DCAMode {

  65.     DCA_MONO = 0,

  66.     DCA_CHANNEL,

  67.     DCA_STEREO,

  68.     DCA_STEREO_SUMDIFF,

  69.     DCA_STEREO_TOTAL,

  70.     DCA_3F,

  71.     DCA_2F1R,

  72.     DCA_3F1R,

  73.     DCA_2F2R,

  74.     DCA_3F2R,

  75.     DCA_4F2R

  76. };

  77. 

  78. /* these are unconfirmed but should be mostly correct */

  79. enum DCAExSSSpeakerMask {

  80.     DCA_EXSS_FRONT_CENTER          = 0x0001,

  81.     DCA_EXSS_FRONT_LEFT_RIGHT      = 0x0002,

  82.     DCA_EXSS_SIDE_REAR_LEFT_RIGHT  = 0x0004,

  83.     DCA_EXSS_LFE                   = 0x0008,

  84.     DCA_EXSS_REAR_CENTER           = 0x0010,

  85.     DCA_EXSS_FRONT_HIGH_LEFT_RIGHT = 0x0020,

  86.     DCA_EXSS_REAR_LEFT_RIGHT       = 0x0040,

  87.     DCA_EXSS_FRONT_HIGH_CENTER     = 0x0080,

  88.     DCA_EXSS_OVERHEAD              = 0x0100,

  89.     DCA_EXSS_CENTER_LEFT_RIGHT     = 0x0200,

  90.     DCA_EXSS_WIDE_LEFT_RIGHT       = 0x0400,

  91.     DCA_EXSS_SIDE_LEFT_RIGHT       = 0x0800,

  92.     DCA_EXSS_LFE2                  = 0x1000,

  93.     DCA_EXSS_SIDE_HIGH_LEFT_RIGHT  = 0x2000,

  94.     DCA_EXSS_REAR_HIGH_CENTER      = 0x4000,

  95.     DCA_EXSS_REAR_HIGH_LEFT_RIGHT  = 0x8000,

  96. };

  97. 

  98. enum DCAXxchSpeakerMask {

  99.     DCA_XXCH_FRONT_CENTER          = 0x0000001,

  100.     DCA_XXCH_FRONT_LEFT            = 0x0000002,

  101.     DCA_XXCH_FRONT_RIGHT           = 0x0000004,

  102.     DCA_XXCH_SIDE_REAR_LEFT        = 0x0000008,

  103.     DCA_XXCH_SIDE_REAR_RIGHT       = 0x0000010,

  104.     DCA_XXCH_LFE1                  = 0x0000020,

  105.     DCA_XXCH_REAR_CENTER           = 0x0000040,

  106.     DCA_XXCH_SURROUND_REAR_LEFT    = 0x0000080,

  107.     DCA_XXCH_SURROUND_REAR_RIGHT   = 0x0000100,

  108.     DCA_XXCH_SIDE_SURROUND_LEFT    = 0x0000200,

  109.     DCA_XXCH_SIDE_SURROUND_RIGHT   = 0x0000400,

  110.     DCA_XXCH_FRONT_CENTER_LEFT     = 0x0000800,

  111.     DCA_XXCH_FRONT_CENTER_RIGHT    = 0x0001000,

  112.     DCA_XXCH_FRONT_HIGH_LEFT       = 0x0002000,

  113.     DCA_XXCH_FRONT_HIGH_CENTER     = 0x0004000,

  114.     DCA_XXCH_FRONT_HIGH_RIGHT      = 0x0008000,

  115.     DCA_XXCH_LFE2                  = 0x0010000,

  116.     DCA_XXCH_SIDE_FRONT_LEFT       = 0x0020000,

  117.     DCA_XXCH_SIDE_FRONT_RIGHT      = 0x0040000,

  118.     DCA_XXCH_OVERHEAD              = 0x0080000,

  119.     DCA_XXCH_SIDE_HIGH_LEFT        = 0x0100000,

  120.     DCA_XXCH_SIDE_HIGH_RIGHT       = 0x0200000,

  121.     DCA_XXCH_REAR_HIGH_CENTER      = 0x0400000,

  122.     DCA_XXCH_REAR_HIGH_LEFT        = 0x0800000,

  123.     DCA_XXCH_REAR_HIGH_RIGHT       = 0x1000000,

  124.     DCA_XXCH_REAR_LOW_CENTER       = 0x2000000,

  125.     DCA_XXCH_REAR_LOW_LEFT         = 0x4000000,

  126.     DCA_XXCH_REAR_LOW_RIGHT        = 0x8000000,

  127. };

  128. 

  129. static const uint32_t map_xxch_to_native[28] = {

  130.     AV_CH_FRONT_CENTER,

  131.     AV_CH_FRONT_LEFT,

  132.     AV_CH_FRONT_RIGHT,

  133.     AV_CH_SIDE_LEFT,

  134.     AV_CH_SIDE_RIGHT,

  135.     AV_CH_LOW_FREQUENCY,

  136.     AV_CH_BACK_CENTER,

  137.     AV_CH_BACK_LEFT,

  138.     AV_CH_BACK_RIGHT,

  139.     AV_CH_SIDE_LEFT,           /* side surround left -- dup sur side L */

  140.     AV_CH_SIDE_RIGHT,          /* side surround right -- dup sur side R */

  141.     AV_CH_FRONT_LEFT_OF_CENTER,

  142.     AV_CH_FRONT_RIGHT_OF_CENTER,

  143.     AV_CH_TOP_FRONT_LEFT,

  144.     AV_CH_TOP_FRONT_CENTER,

  145.     AV_CH_TOP_FRONT_RIGHT,

  146.     AV_CH_LOW_FREQUENCY,        /* lfe2 -- duplicate lfe1 position */

  147.     AV_CH_FRONT_LEFT_OF_CENTER, /* side front left -- dup front cntr L */

  148.     AV_CH_FRONT_RIGHT_OF_CENTER,/* side front right -- dup front cntr R */

  149.     AV_CH_TOP_CENTER,           /* overhead */

  150.     AV_CH_TOP_FRONT_LEFT,       /* side high left -- dup */

  151.     AV_CH_TOP_FRONT_RIGHT,      /* side high right -- dup */

  152.     AV_CH_TOP_BACK_CENTER,

  153.     AV_CH_TOP_BACK_LEFT,

  154.     AV_CH_TOP_BACK_RIGHT,

  155.     AV_CH_BACK_CENTER,          /* rear low center -- dup */

  156.     AV_CH_BACK_LEFT,            /* rear low left -- dup */

  157.     AV_CH_BACK_RIGHT            /* read low right -- dup  */

  158. };

  159. 

  160. enum DCAExtensionMask {

  161.     DCA_EXT_CORE       = 0x001, ///< core in core substream

  162.     DCA_EXT_XXCH       = 0x002, ///< XXCh channels extension in core substream

  163.     DCA_EXT_X96        = 0x004, ///< 96/24 extension in core substream

  164.     DCA_EXT_XCH        = 0x008, ///< XCh channel extension in core substream

  165.     DCA_EXT_EXSS_CORE  = 0x010, ///< core in ExSS (extension substream)

  166.     DCA_EXT_EXSS_XBR   = 0x020, ///< extended bitrate extension in ExSS

  167.     DCA_EXT_EXSS_XXCH  = 0x040, ///< XXCh channels extension in ExSS

  168.     DCA_EXT_EXSS_X96   = 0x080, ///< 96/24 extension in ExSS

  169.     DCA_EXT_EXSS_LBR   = 0x100, ///< low bitrate component in ExSS

  170.     DCA_EXT_EXSS_XLL   = 0x200, ///< lossless extension in ExSS

  171. };

  172. 

  173. /* -1 are reserved or unknown */

  174. static const int dca_ext_audio_descr_mask[] = {

  175.     DCA_EXT_XCH,

  176.     -1,

  177.     DCA_EXT_X96,

  178.     DCA_EXT_XCH | DCA_EXT_X96,

  179.     -1,

  180.     -1,

  181.     DCA_EXT_XXCH,

  182.     -1,

  183. };

  184. 

  185. /* extensions that reside in core substream */

  186. #define DCA_CORE_EXTS (DCA_EXT_XCH | DCA_EXT_XXCH | DCA_EXT_X96)

  187. 

  188. /* Tables for mapping dts channel configurations to libavcodec multichannel api.

  189.  * Some compromises have been made for special configurations. Most configurations

  190.  * are never used so complete accuracy is not needed.

  191.  *

  192.  * L = left, R = right, C = center, S = surround, F = front, R = rear, T = total, OV = overhead.

  193.  * S  -> side, when both rear and back are configured move one of them to the side channel

  194.  * OV -> center back

  195.  * All 2 channel configurations -> AV_CH_LAYOUT_STEREO

  196.  */

  197. static const uint64_t dca_core_channel_layout[] = {

  198.     AV_CH_FRONT_CENTER,                                                     ///< 1, A

  199.     AV_CH_LAYOUT_STEREO,                                                    ///< 2, A + B (dual mono)

  200.     AV_CH_LAYOUT_STEREO,                                                    ///< 2, L + R (stereo)

  201.     AV_CH_LAYOUT_STEREO,                                                    ///< 2, (L + R) + (L - R) (sum-difference)

  202.     AV_CH_LAYOUT_STEREO,                                                    ///< 2, LT + RT (left and right total)

  203.     AV_CH_LAYOUT_STEREO | AV_CH_FRONT_CENTER,                               ///< 3, C + L + R

  204.     AV_CH_LAYOUT_STEREO | AV_CH_BACK_CENTER,                                ///< 3, L + R + S

  205.     AV_CH_LAYOUT_STEREO | AV_CH_FRONT_CENTER | AV_CH_BACK_CENTER,           ///< 4, C + L + R + S

  206.     AV_CH_LAYOUT_STEREO | AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT,               ///< 4, L + R + SL + SR

  207. 

  208.     AV_CH_LAYOUT_STEREO | AV_CH_FRONT_CENTER | AV_CH_SIDE_LEFT |

  209.     AV_CH_SIDE_RIGHT,                                                       ///< 5, C + L + R + SL + SR

  210. 

  211.     AV_CH_LAYOUT_STEREO | AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT |

  212.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER,               ///< 6, CL + CR + L + R + SL + SR

  213. 

  214.     AV_CH_LAYOUT_STEREO | AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT |

  215.     AV_CH_FRONT_CENTER  | AV_CH_BACK_CENTER,                                ///< 6, C + L + R + LR + RR + OV

  216. 

  217.     AV_CH_FRONT_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER |

  218.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_BACK_CENTER   |

  219.     AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT,                                     ///< 6, CF + CR + LF + RF + LR + RR

  220. 

  221.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_CENTER   |

  222.     AV_CH_FRONT_RIGHT_OF_CENTER | AV_CH_LAYOUT_STEREO |

  223.     AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT,                                     ///< 7, CL + C + CR + L + R + SL + SR

  224. 

  225.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER |

  226.     AV_CH_LAYOUT_STEREO | AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT |

  227.     AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT,                                     ///< 8, CL + CR + L + R + SL1 + SL2 + SR1 + SR2

  228. 

  229.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_CENTER   |

  230.     AV_CH_FRONT_RIGHT_OF_CENTER | AV_CH_LAYOUT_STEREO |

  231.     AV_CH_SIDE_LEFT | AV_CH_BACK_CENTER | AV_CH_SIDE_RIGHT,                 ///< 8, CL + C + CR + L + R + SL + S + SR

  232. };

  233. 

  234. static const int8_t dca_lfe_index[] = {

  235.     1, 2, 2, 2, 2, 3, 2, 3, 2, 3, 2, 3, 1, 3, 2, 3

  236. };

  237. 

  238. static const int8_t dca_channel_reorder_lfe[][9] = {

  239.     { 0, -1, -1, -1, -1, -1, -1, -1, -1},

  240.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  241.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  242.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  243.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  244.     { 2,  0,  1, -1, -1, -1, -1, -1, -1},

  245.     { 0,  1,  3, -1, -1, -1, -1, -1, -1},

  246.     { 2,  0,  1,  4, -1, -1, -1, -1, -1},

  247.     { 0,  1,  3,  4, -1, -1, -1, -1, -1},

  248.     { 2,  0,  1,  4,  5, -1, -1, -1, -1},

  249.     { 3,  4,  0,  1,  5,  6, -1, -1, -1},

  250.     { 2,  0,  1,  4,  5,  6, -1, -1, -1},

  251.     { 0,  6,  4,  5,  2,  3, -1, -1, -1},

  252.     { 4,  2,  5,  0,  1,  6,  7, -1, -1},

  253.     { 5,  6,  0,  1,  7,  3,  8,  4, -1},

  254.     { 4,  2,  5,  0,  1,  6,  8,  7, -1},

  255. };

  256. 

  257. static const int8_t dca_channel_reorder_lfe_xch[][9] = {

  258.     { 0,  2, -1, -1, -1, -1, -1, -1, -1},

  259.     { 0,  1,  3, -1, -1, -1, -1, -1, -1},

  260.     { 0,  1,  3, -1, -1, -1, -1, -1, -1},

  261.     { 0,  1,  3, -1, -1, -1, -1, -1, -1},

  262.     { 0,  1,  3, -1, -1, -1, -1, -1, -1},

  263.     { 2,  0,  1,  4, -1, -1, -1, -1, -1},

  264.     { 0,  1,  3,  4, -1, -1, -1, -1, -1},

  265.     { 2,  0,  1,  4,  5, -1, -1, -1, -1},

  266.     { 0,  1,  4,  5,  3, -1, -1, -1, -1},

  267.     { 2,  0,  1,  5,  6,  4, -1, -1, -1},

  268.     { 3,  4,  0,  1,  6,  7,  5, -1, -1},

  269.     { 2,  0,  1,  4,  5,  6,  7, -1, -1},

  270.     { 0,  6,  4,  5,  2,  3,  7, -1, -1},

  271.     { 4,  2,  5,  0,  1,  7,  8,  6, -1},

  272.     { 5,  6,  0,  1,  8,  3,  9,  4,  7},

  273.     { 4,  2,  5,  0,  1,  6,  9,  8,  7},

  274. };

  275. 

  276. static const int8_t dca_channel_reorder_nolfe[][9] = {

  277.     { 0, -1, -1, -1, -1, -1, -1, -1, -1},

  278.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  279.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  280.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  281.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  282.     { 2,  0,  1, -1, -1, -1, -1, -1, -1},

  283.     { 0,  1,  2, -1, -1, -1, -1, -1, -1},

  284.     { 2,  0,  1,  3, -1, -1, -1, -1, -1},

  285.     { 0,  1,  2,  3, -1, -1, -1, -1, -1},

  286.     { 2,  0,  1,  3,  4, -1, -1, -1, -1},

  287.     { 2,  3,  0,  1,  4,  5, -1, -1, -1},

  288.     { 2,  0,  1,  3,  4,  5, -1, -1, -1},

  289.     { 0,  5,  3,  4,  1,  2, -1, -1, -1},

  290.     { 3,  2,  4,  0,  1,  5,  6, -1, -1},

  291.     { 4,  5,  0,  1,  6,  2,  7,  3, -1},

  292.     { 3,  2,  4,  0,  1,  5,  7,  6, -1},

  293. };

  294. 

  295. static const int8_t dca_channel_reorder_nolfe_xch[][9] = {

  296.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  297.     { 0,  1,  2, -1, -1, -1, -1, -1, -1},

  298.     { 0,  1,  2, -1, -1, -1, -1, -1, -1},

  299.     { 0,  1,  2, -1, -1, -1, -1, -1, -1},

  300.     { 0,  1,  2, -1, -1, -1, -1, -1, -1},

  301.     { 2,  0,  1,  3, -1, -1, -1, -1, -1},

  302.     { 0,  1,  2,  3, -1, -1, -1, -1, -1},

  303.     { 2,  0,  1,  3,  4, -1, -1, -1, -1},

  304.     { 0,  1,  3,  4,  2, -1, -1, -1, -1},

  305.     { 2,  0,  1,  4,  5,  3, -1, -1, -1},

  306.     { 2,  3,  0,  1,  5,  6,  4, -1, -1},

  307.     { 2,  0,  1,  3,  4,  5,  6, -1, -1},

  308.     { 0,  5,  3,  4,  1,  2,  6, -1, -1},

  309.     { 3,  2,  4,  0,  1,  6,  7,  5, -1},

  310.     { 4,  5,  0,  1,  7,  2,  8,  3,  6},

  311.     { 3,  2,  4,  0,  1,  5,  8,  7,  6},

  312. };

  313. 

  314. #define DCA_DOLBY                  101           /* FIXME */

  315. 

  316. #define DCA_CHANNEL_BITS             6

  317. #define DCA_CHANNEL_MASK          0x3F

  318. 

  319. #define DCA_LFE                   0x80

  320. 

  321. #define HEADER_SIZE                 14

  322. 

  323. #define DCA_MAX_FRAME_SIZE       16384

  324. #define DCA_MAX_EXSS_HEADER_SIZE  4096

  325. 

  326. #define DCA_BUFFER_PADDING_SIZE   1024

  327. 

  328. #define DCA_NSYNCAUX        0x9A1105A0

  329. 

  330. /** Bit allocation */

  331. typedef struct {

  332.     int offset;                 ///< code values offset

  333.     int maxbits[8];             ///< max bits in VLC

  334.     int wrap;                   ///< wrap for get_vlc2()

  335.     VLC vlc[8];                 ///< actual codes

  336. } BitAlloc;

  337. 

  338. static BitAlloc dca_bitalloc_index;    ///< indexes for samples VLC select

  339. static BitAlloc dca_tmode;             ///< transition mode VLCs

  340. static BitAlloc dca_scalefactor;       ///< scalefactor VLCs

  341. static BitAlloc dca_smpl_bitalloc[11]; ///< samples VLCs

  342. 

  343. static av_always_inline int get_bitalloc(GetBitContext *gb, BitAlloc *ba,

  344.                                          int idx)

  345. {

  346.     return get_vlc2(gb, ba->vlc[idx].table, ba->vlc[idx].bits, ba->wrap) +

  347.            ba->offset;

  348. }

  349. 

  350. typedef struct {

  351.     const AVClass *class;       ///< class for AVOptions

  352.     AVCodecContext *avctx;

  353.     /* Frame header */

  354.     int frame_type;             ///< type of the current frame

  355.     int samples_deficit;        ///< deficit sample count

  356.     int crc_present;            ///< crc is present in the bitstream

  357.     int sample_blocks;          ///< number of PCM sample blocks

  358.     int frame_size;             ///< primary frame byte size

  359.     int amode;                  ///< audio channels arrangement

  360.     int sample_rate;            ///< audio sampling rate

  361.     int bit_rate;               ///< transmission bit rate

  362.     int bit_rate_index;         ///< transmission bit rate index

  363. 

  364.     int dynrange;               ///< embedded dynamic range flag

  365.     int timestamp;              ///< embedded time stamp flag

  366.     int aux_data;               ///< auxiliary data flag

  367.     int hdcd;                   ///< source material is mastered in HDCD

  368.     int ext_descr;              ///< extension audio descriptor flag

  369.     int ext_coding;             ///< extended coding flag

  370.     int aspf;                   ///< audio sync word insertion flag

  371.     int lfe;                    ///< low frequency effects flag

  372.     int predictor_history;      ///< predictor history flag

  373.     int header_crc;             ///< header crc check bytes

  374.     int multirate_inter;        ///< multirate interpolator switch

  375.     int version;                ///< encoder software revision

  376.     int copy_history;           ///< copy history

  377.     int source_pcm_res;         ///< source pcm resolution

  378.     int front_sum;              ///< front sum/difference flag

  379.     int surround_sum;           ///< surround sum/difference flag

  380.     int dialog_norm;            ///< dialog normalisation parameter

  381. 

  382.     /* Primary audio coding header */

  383.     int subframes;              ///< number of subframes

  384.     int total_channels;         ///< number of channels including extensions

  385.     int prim_channels;          ///< number of primary audio channels

  386.     int subband_activity[DCA_PRIM_CHANNELS_MAX];    ///< subband activity count

  387.     int vq_start_subband[DCA_PRIM_CHANNELS_MAX];    ///< high frequency vq start subband

  388.     int joint_intensity[DCA_PRIM_CHANNELS_MAX];     ///< joint intensity coding index

  389.     int transient_huffman[DCA_PRIM_CHANNELS_MAX];   ///< transient mode code book

  390.     int scalefactor_huffman[DCA_PRIM_CHANNELS_MAX]; ///< scale factor code book

  391.     int bitalloc_huffman[DCA_PRIM_CHANNELS_MAX];    ///< bit allocation quantizer select

  392.     int quant_index_huffman[DCA_PRIM_CHANNELS_MAX][DCA_ABITS_MAX]; ///< quantization index codebook select

  393.     float scalefactor_adj[DCA_PRIM_CHANNELS_MAX][DCA_ABITS_MAX];   ///< scale factor adjustment

  394. 

  395.     /* Primary audio coding side information */

  396.     int subsubframes[DCA_SUBFRAMES_MAX];                         ///< number of subsubframes

  397.     int partial_samples[DCA_SUBFRAMES_MAX];                      ///< partial subsubframe samples count

  398.     int prediction_mode[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS];    ///< prediction mode (ADPCM used or not)

  399.     int prediction_vq[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS];      ///< prediction VQ coefs

  400.     int bitalloc[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS];           ///< bit allocation index

  401.     int transition_mode[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS];    ///< transition mode (transients)

  402.     int32_t scale_factor[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][2];///< scale factors (2 if transient)

  403.     int joint_huff[DCA_PRIM_CHANNELS_MAX];                       ///< joint subband scale factors codebook

  404.     int joint_scale_factor[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; ///< joint subband scale factors

  405.     float downmix_coef[DCA_PRIM_CHANNELS_MAX + 1][2];            ///< stereo downmix coefficients

  406.     int dynrange_coef;                                           ///< dynamic range coefficient

  407. 

  408.     /* Core substream's embedded downmix coefficients (cf. ETSI TS 102 114 V1.4.1)

  409.      * Input:  primary audio channels (incl. LFE if present)

  410.      * Output: downmix audio channels (up to 4, no LFE) */

  411.     uint8_t  core_downmix;                                       ///< embedded downmix coefficients available

  412.     uint8_t  core_downmix_amode;                                 ///< audio channel arrangement of embedded downmix

  413.     uint16_t core_downmix_codes[DCA_PRIM_CHANNELS_MAX + 1][4];   ///< embedded downmix coefficients (9-bit codes)

  414. 

  415.     int32_t  high_freq_vq[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS];  ///< VQ encoded high frequency subbands

  416. 

  417.     float lfe_data[2 * DCA_LFE_MAX * (DCA_BLOCKS_MAX + 4)];      ///< Low frequency effect data

  418.     int lfe_scale_factor;

  419. 

  420.     /* Subband samples history (for ADPCM) */

  421.     DECLARE_ALIGNED(16, float, subband_samples_hist)[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][4];

  422.     DECLARE_ALIGNED(32, float, subband_fir_hist)[DCA_PRIM_CHANNELS_MAX][512];

  423.     DECLARE_ALIGNED(32, float, subband_fir_noidea)[DCA_PRIM_CHANNELS_MAX][32];

  424.     int hist_index[DCA_PRIM_CHANNELS_MAX];

  425.     DECLARE_ALIGNED(32, float, raXin)[32];

  426. 

  427.     int output;                 ///< type of output

  428. 

  429.     DECLARE_ALIGNED(32, float, subband_samples)[DCA_BLOCKS_MAX][DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][8];

  430.     float *samples_chanptr[DCA_PRIM_CHANNELS_MAX + 1];

  431.     float *extra_channels[DCA_PRIM_CHANNELS_MAX + 1];

  432.     uint8_t *extra_channels_buffer;

  433.     unsigned int extra_channels_buffer_size;

  434. 

  435.     uint8_t dca_buffer[DCA_MAX_FRAME_SIZE + DCA_MAX_EXSS_HEADER_SIZE + DCA_BUFFER_PADDING_SIZE];

  436.     int dca_buffer_size;        ///< how much data is in the dca_buffer

  437. 

  438.     const int8_t *channel_order_tab;  ///< channel reordering table, lfe and non lfe

  439.     GetBitContext gb;

  440.     /* Current position in DCA frame */

  441.     int current_subframe;

  442.     int current_subsubframe;

  443. 

  444.     int core_ext_mask;          ///< present extensions in the core substream

  445. 

  446.     /* XCh extension information */

  447.     int xch_present;            ///< XCh extension present and valid

  448.     int xch_base_channel;       ///< index of first (only) channel containing XCH data

  449.     int xch_disable;            ///< whether the XCh extension should be decoded or not

  450. 

  451.     /* XXCH extension information */

  452.     int xxch_chset;

  453.     int xxch_nbits_spk_mask;

  454.     uint32_t xxch_core_spkmask;

  455.     uint32_t xxch_spk_masks[4]; /* speaker masks, last element is core mask */

  456.     int xxch_chset_nch[4];

  457.     float xxch_dmix_sf[DCA_CHSETS_MAX];

  458. 

  459.     uint32_t xxch_dmix_embedded;  /* lower layer has mix pre-embedded, per chset */

  460.     float xxch_dmix_coeff[DCA_PRIM_CHANNELS_MAX][32]; /* worst case sizing */

  461. 

  462.     int8_t xxch_order_tab[32];

  463.     int8_t lfe_index;

  464. 

  465.     /* ExSS header parser */

  466.     int static_fields;          ///< static fields present

  467.     int mix_metadata;           ///< mixing metadata present

  468.     int num_mix_configs;        ///< number of mix out configurations

  469.     int mix_config_num_ch[4];   ///< number of channels in each mix out configuration

  470. 

  471.     int profile;

  472. 

  473.     int debug_flag;             ///< used for suppressing repeated error messages output

  474.     AVFloatDSPContext fdsp;

  475.     FFTContext imdct;

  476.     SynthFilterContext synth;

  477.     DCADSPContext dcadsp;

  478.     FmtConvertContext fmt_conv;

  479. } DCAContext;

  480. 

  481. static float dca_dmix_code(unsigned code);

  482. 

  483. static const uint16_t dca_vlc_offs[] = {

  484.         0,   512,   640,   768,  1282,  1794,  2436,  3080,  3770,  4454,  5364,

  485.      5372,  5380,  5388,  5392,  5396,  5412,  5420,  5428,  5460,  5492,  5508,

  486.      5572,  5604,  5668,  5796,  5860,  5892,  6412,  6668,  6796,  7308,  7564,

  487.      7820,  8076,  8620,  9132,  9388,  9910, 10166, 10680, 11196, 11726, 12240,

  488.     12752, 13298, 13810, 14326, 14840, 15500, 16022, 16540, 17158, 17678, 18264,

  489.     18796, 19352, 19926, 20468, 21472, 22398, 23014, 23622,

  490. };

  491. 

  492. static av_cold void dca_init_vlcs(void)

  493. {

  494.     static int vlcs_initialized = 0;

  495.     int i, j, c = 14;

  496.     static VLC_TYPE dca_table[23622][2];

  497. 

  498.     if (vlcs_initialized)

  499.         return;

  500. 

  501.     dca_bitalloc_index.offset = 1;

  502.     dca_bitalloc_index.wrap = 2;

  503.     for (i = 0; i < 5; i++) {

  504.         dca_bitalloc_index.vlc[i].table = &dca_table[dca_vlc_offs[i]];

  505.         dca_bitalloc_index.vlc[i].table_allocated = dca_vlc_offs[i + 1] - dca_vlc_offs[i];

  506.         init_vlc(&dca_bitalloc_index.vlc[i], bitalloc_12_vlc_bits[i], 12,

  507.                  bitalloc_12_bits[i], 1, 1,

  508.                  bitalloc_12_codes[i], 2, 2, INIT_VLC_USE_NEW_STATIC);

  509.     }

  510.     dca_scalefactor.offset = -64;

  511.     dca_scalefactor.wrap = 2;

  512.     for (i = 0; i < 5; i++) {

  513.         dca_scalefactor.vlc[i].table = &dca_table[dca_vlc_offs[i + 5]];

  514.         dca_scalefactor.vlc[i].table_allocated = dca_vlc_offs[i + 6] - dca_vlc_offs[i + 5];

  515.         init_vlc(&dca_scalefactor.vlc[i], SCALES_VLC_BITS, 129,

  516.                  scales_bits[i], 1, 1,

  517.                  scales_codes[i], 2, 2, INIT_VLC_USE_NEW_STATIC);

  518.     }

  519.     dca_tmode.offset = 0;

  520.     dca_tmode.wrap = 1;

  521.     for (i = 0; i < 4; i++) {

  522.         dca_tmode.vlc[i].table = &dca_table[dca_vlc_offs[i + 10]];

  523.         dca_tmode.vlc[i].table_allocated = dca_vlc_offs[i + 11] - dca_vlc_offs[i + 10];

  524.         init_vlc(&dca_tmode.vlc[i], tmode_vlc_bits[i], 4,

  525.                  tmode_bits[i], 1, 1,

  526.                  tmode_codes[i], 2, 2, INIT_VLC_USE_NEW_STATIC);

  527.     }

  528. 

  529.     for (i = 0; i < 10; i++)

  530.         for (j = 0; j < 7; j++) {

  531.             if (!bitalloc_codes[i][j])

  532.                 break;

  533.             dca_smpl_bitalloc[i + 1].offset                 = bitalloc_offsets[i];

  534.             dca_smpl_bitalloc[i + 1].wrap                   = 1 + (j > 4);

  535.             dca_smpl_bitalloc[i + 1].vlc[j].table           = &dca_table[dca_vlc_offs[c]];

  536.             dca_smpl_bitalloc[i + 1].vlc[j].table_allocated = dca_vlc_offs[c + 1] - dca_vlc_offs[c];

  537. 

  538.             init_vlc(&dca_smpl_bitalloc[i + 1].vlc[j], bitalloc_maxbits[i][j],

  539.                      bitalloc_sizes[i],

  540.                      bitalloc_bits[i][j], 1, 1,

  541.                      bitalloc_codes[i][j], 2, 2, INIT_VLC_USE_NEW_STATIC);

  542.             c++;

  543.         }

  544.     vlcs_initialized = 1;

  545. }

  546. 

  547. static inline void get_array(GetBitContext *gb, int *dst, int len, int bits)

  548. {

  549.     while (len--)

  550.         *dst++ = get_bits(gb, bits);

  551. }

  552. 

  553. static inline int dca_xxch2index(DCAContext *s, int xxch_ch)

  554. {

  555.     int i, base, mask;

  556. 

  557.     /* locate channel set containing the channel */

  558.     for (i = -1, base = 0, mask = (s->xxch_core_spkmask & ~DCA_XXCH_LFE1);

  559.          i <= s->xxch_chset && !(mask & xxch_ch); mask = s->xxch_spk_masks[++i])

  560.         base += av_popcount(mask);

  561. 

  562.     return base + av_popcount(mask & (xxch_ch - 1));

  563. }

  564. 

  565. static int dca_parse_audio_coding_header(DCAContext *s, int base_channel,

  566.                                          int xxch)

  567. {

  568.     int i, j;

  569.     static const float adj_table[4] = { 1.0, 1.1250, 1.2500, 1.4375 };

  570.     static const int bitlen[11] = { 0, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3 };

  571.     static const int thr[11]    = { 0, 1, 3, 3, 3, 3, 7, 7, 7, 7, 7 };

  572.     int hdr_pos = 0, hdr_size = 0;

  573.     float scale_factor;

  574.     int this_chans, acc_mask;

  575.     int embedded_downmix;

  576.     int nchans, mask[8];

  577.     int coeff, ichan;

  578. 

  579.     /* xxch has arbitrary sized audio coding headers */

  580.     if (xxch) {

  581.         hdr_pos  = get_bits_count(&s->gb);

  582.         hdr_size = get_bits(&s->gb, 7) + 1;

  583.     }

  584. 

  585.     nchans = get_bits(&s->gb, 3) + 1;

  586.     s->total_channels = nchans + base_channel;

  587.     s->prim_channels  = s->total_channels;

  588. 

  589.     /* obtain speaker layout mask & downmix coefficients for XXCH */

  590.     if (xxch) {

  591.         acc_mask = s->xxch_core_spkmask;

  592. 

  593.         this_chans = get_bits(&s->gb, s->xxch_nbits_spk_mask - 6) << 6;

  594.         s->xxch_spk_masks[s->xxch_chset] = this_chans;

  595.         s->xxch_chset_nch[s->xxch_chset] = nchans;

  596. 

  597.         for (i = 0; i <= s->xxch_chset; i++)

  598.             acc_mask |= s->xxch_spk_masks[i];

  599. 

  600.         /* check for downmixing information */

  601.         if (get_bits1(&s->gb)) {

  602.             embedded_downmix = get_bits1(&s->gb);

  603.             coeff            = get_bits(&s->gb, 6);

  604. 

  605.             if (coeff<1 || coeff>61) {

  606.                 av_log(s->avctx, AV_LOG_ERROR, "6bit coeff %d is out of range\n", coeff);

  607.                 return AVERROR_INVALIDDATA;

  608.             }

  609. 

  610.             scale_factor     = -1.0f / dca_dmix_code((coeff<<2)-3);

  611. 

  612.             s->xxch_dmix_sf[s->xxch_chset] = scale_factor;

  613. 

  614.             for (i = base_channel; i < s->prim_channels; i++) {

  615.                 mask[i] = get_bits(&s->gb, s->xxch_nbits_spk_mask);

  616.             }

  617. 

  618.             for (j = base_channel; j < s->prim_channels; j++) {

  619.                 memset(s->xxch_dmix_coeff[j], 0, sizeof(s->xxch_dmix_coeff[0]));

  620.                 s->xxch_dmix_embedded |= (embedded_downmix << j);

  621.                 for (i = 0; i < s->xxch_nbits_spk_mask; i++) {

  622.                     if (mask[j] & (1 << i)) {

  623.                         if ((1 << i) == DCA_XXCH_LFE1) {

  624.                             av_log(s->avctx, AV_LOG_WARNING,

  625.                                    "DCA-XXCH: dmix to LFE1 not supported.\n");

  626.                             continue;

  627.                         }

  628. 

  629.                         coeff = get_bits(&s->gb, 7);

  630.                         ichan = dca_xxch2index(s, 1 << i);

  631.                         if ((coeff&63)<1 || (coeff&63)>61) {

  632.                             av_log(s->avctx, AV_LOG_ERROR, "7bit coeff %d is out of range\n", coeff);

  633.                             return AVERROR_INVALIDDATA;

  634.                         }

  635.                         s->xxch_dmix_coeff[j][ichan] = dca_dmix_code((coeff<<2)-3);

  636.                     }

  637.                 }

  638.             }

  639.         }

  640.     }

  641. 

  642.     if (s->prim_channels > DCA_PRIM_CHANNELS_MAX)

  643.         s->prim_channels = DCA_PRIM_CHANNELS_MAX;

  644. 

  645. 

  646.     for (i = base_channel; i < s->prim_channels; i++) {

  647.         s->subband_activity[i] = get_bits(&s->gb, 5) + 2;

  648.         if (s->subband_activity[i] > DCA_SUBBANDS)

  649.             s->subband_activity[i] = DCA_SUBBANDS;

  650.     }

  651.     for (i = base_channel; i < s->prim_channels; i++) {

  652.         s->vq_start_subband[i] = get_bits(&s->gb, 5) + 1;

  653.         if (s->vq_start_subband[i] > DCA_SUBBANDS)

  654.             s->vq_start_subband[i] = DCA_SUBBANDS;

  655.     }

  656.     get_array(&s->gb, s->joint_intensity + base_channel,     s->prim_channels - base_channel, 3);

  657.     get_array(&s->gb, s->transient_huffman + base_channel,   s->prim_channels - base_channel, 2);

  658.     get_array(&s->gb, s->scalefactor_huffman + base_channel, s->prim_channels - base_channel, 3);

  659.     get_array(&s->gb, s->bitalloc_huffman + base_channel,    s->prim_channels - base_channel, 3);

  660. 

  661.     /* Get codebooks quantization indexes */

  662.     if (!base_channel)

  663.         memset(s->quant_index_huffman, 0, sizeof(s->quant_index_huffman));

  664.     for (j = 1; j < 11; j++)

  665.         for (i = base_channel; i < s->prim_channels; i++)

  666.             s->quant_index_huffman[i][j] = get_bits(&s->gb, bitlen[j]);

  667. 

  668.     /* Get scale factor adjustment */

  669.     for (j = 0; j < 11; j++)

  670.         for (i = base_channel; i < s->prim_channels; i++)

  671.             s->scalefactor_adj[i][j] = 1;

  672. 

  673.     for (j = 1; j < 11; j++)

  674.         for (i = base_channel; i < s->prim_channels; i++)

  675.             if (s->quant_index_huffman[i][j] < thr[j])

  676.                 s->scalefactor_adj[i][j] = adj_table[get_bits(&s->gb, 2)];

  677. 

  678.     if (!xxch) {

  679.         if (s->crc_present) {

  680.             /* Audio header CRC check */

  681.             get_bits(&s->gb, 16);

  682.         }

  683.     } else {

  684.         /* Skip to the end of the header, also ignore CRC if present  */

  685.         i = get_bits_count(&s->gb);

  686.         if (hdr_pos + 8 * hdr_size > i)

  687.             skip_bits_long(&s->gb, hdr_pos + 8 * hdr_size - i);

  688.     }

  689. 

  690.     s->current_subframe    = 0;

  691.     s->current_subsubframe = 0;

  692. 

  693. #ifdef TRACE

  694.     av_log(s->avctx, AV_LOG_DEBUG, "subframes: %i\n", s->subframes);

  695.     av_log(s->avctx, AV_LOG_DEBUG, "prim channels: %i\n", s->prim_channels);

  696.     for (i = base_channel; i < s->prim_channels; i++) {

  697.         av_log(s->avctx, AV_LOG_DEBUG, "subband activity: %i\n",

  698.                s->subband_activity[i]);

  699.         av_log(s->avctx, AV_LOG_DEBUG, "vq start subband: %i\n",

  700.                s->vq_start_subband[i]);

  701.         av_log(s->avctx, AV_LOG_DEBUG, "joint intensity: %i\n",

  702.                s->joint_intensity[i]);

  703.         av_log(s->avctx, AV_LOG_DEBUG, "transient mode codebook: %i\n",

  704.                s->transient_huffman[i]);

  705.         av_log(s->avctx, AV_LOG_DEBUG, "scale factor codebook: %i\n",

  706.                s->scalefactor_huffman[i]);

  707.         av_log(s->avctx, AV_LOG_DEBUG, "bit allocation quantizer: %i\n",

  708.                s->bitalloc_huffman[i]);

  709.         av_log(s->avctx, AV_LOG_DEBUG, "quant index huff:");

  710.         for (j = 0; j < 11; j++)

  711.             av_log(s->avctx, AV_LOG_DEBUG, " %i", s->quant_index_huffman[i][j]);

  712.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  713.         av_log(s->avctx, AV_LOG_DEBUG, "scalefac adj:");

  714.         for (j = 0; j < 11; j++)

  715.             av_log(s->avctx, AV_LOG_DEBUG, " %1.3f", s->scalefactor_adj[i][j]);

  716.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  717.     }

  718. #endif

  719. 

  720.     return 0;

  721. }

  722. 

  723. static int dca_parse_frame_header(DCAContext *s)

  724. {

  725.     init_get_bits(&s->gb, s->dca_buffer, s->dca_buffer_size * 8);

  726. 

  727.     /* Sync code */

  728.     skip_bits_long(&s->gb, 32);

  729. 

  730.     /* Frame header */

  731.     s->frame_type        = get_bits(&s->gb, 1);

  732.     s->samples_deficit   = get_bits(&s->gb, 5) + 1;

  733.     s->crc_present       = get_bits(&s->gb, 1);

  734.     s->sample_blocks     = get_bits(&s->gb, 7) + 1;

  735.     s->frame_size        = get_bits(&s->gb, 14) + 1;

  736.     if (s->frame_size < 95)

  737.         return AVERROR_INVALIDDATA;

  738.     s->amode             = get_bits(&s->gb, 6);

  739.     s->sample_rate       = avpriv_dca_sample_rates[get_bits(&s->gb, 4)];

  740.     if (!s->sample_rate)

  741.         return AVERROR_INVALIDDATA;

  742.     s->bit_rate_index    = get_bits(&s->gb, 5);

  743.     s->bit_rate          = dca_bit_rates[s->bit_rate_index];

  744.     if (!s->bit_rate)

  745.         return AVERROR_INVALIDDATA;

  746. 

  747.     skip_bits1(&s->gb); // always 0 (reserved, cf. ETSI TS 102 114 V1.4.1)

  748.     s->dynrange          = get_bits(&s->gb, 1);

  749.     s->timestamp         = get_bits(&s->gb, 1);

  750.     s->aux_data          = get_bits(&s->gb, 1);

  751.     s->hdcd              = get_bits(&s->gb, 1);

  752.     s->ext_descr         = get_bits(&s->gb, 3);

  753.     s->ext_coding        = get_bits(&s->gb, 1);

  754.     s->aspf              = get_bits(&s->gb, 1);

  755.     s->lfe               = get_bits(&s->gb, 2);

  756.     s->predictor_history = get_bits(&s->gb, 1);

  757. 

  758.     if (s->lfe > 2) {

  759.         s->lfe = 0;

  760.         av_log(s->avctx, AV_LOG_ERROR, "Invalid LFE value: %d\n", s->lfe);

  761.         return AVERROR_INVALIDDATA;

  762.     }

  763. 

  764.     /* TODO: check CRC */

  765.     if (s->crc_present)

  766.         s->header_crc    = get_bits(&s->gb, 16);

  767. 

  768.     s->multirate_inter   = get_bits(&s->gb, 1);

  769.     s->version           = get_bits(&s->gb, 4);

  770.     s->copy_history      = get_bits(&s->gb, 2);

  771.     s->source_pcm_res    = get_bits(&s->gb, 3);

  772.     s->front_sum         = get_bits(&s->gb, 1);

  773.     s->surround_sum      = get_bits(&s->gb, 1);

  774.     s->dialog_norm       = get_bits(&s->gb, 4);

  775. 

  776.     /* FIXME: channels mixing levels */

  777.     s->output = s->amode;

  778.     if (s->lfe)

  779.         s->output |= DCA_LFE;

  780. 

  781. #ifdef TRACE

  782.     av_log(s->avctx, AV_LOG_DEBUG, "frame type: %i\n", s->frame_type);

  783.     av_log(s->avctx, AV_LOG_DEBUG, "samples deficit: %i\n", s->samples_deficit);

  784.     av_log(s->avctx, AV_LOG_DEBUG, "crc present: %i\n", s->crc_present);

  785.     av_log(s->avctx, AV_LOG_DEBUG, "sample blocks: %i (%i samples)\n",

  786.            s->sample_blocks, s->sample_blocks * 32);

  787.     av_log(s->avctx, AV_LOG_DEBUG, "frame size: %i bytes\n", s->frame_size);

  788.     av_log(s->avctx, AV_LOG_DEBUG, "amode: %i (%i channels)\n",

  789.            s->amode, dca_channels[s->amode]);

  790.     av_log(s->avctx, AV_LOG_DEBUG, "sample rate: %i Hz\n",

  791.            s->sample_rate);

  792.     av_log(s->avctx, AV_LOG_DEBUG, "bit rate: %i bits/s\n",

  793.            s->bit_rate);

  794.     av_log(s->avctx, AV_LOG_DEBUG, "dynrange: %i\n", s->dynrange);

  795.     av_log(s->avctx, AV_LOG_DEBUG, "timestamp: %i\n", s->timestamp);

  796.     av_log(s->avctx, AV_LOG_DEBUG, "aux_data: %i\n", s->aux_data);

  797.     av_log(s->avctx, AV_LOG_DEBUG, "hdcd: %i\n", s->hdcd);

  798.     av_log(s->avctx, AV_LOG_DEBUG, "ext descr: %i\n", s->ext_descr);

  799.     av_log(s->avctx, AV_LOG_DEBUG, "ext coding: %i\n", s->ext_coding);

  800.     av_log(s->avctx, AV_LOG_DEBUG, "aspf: %i\n", s->aspf);

  801.     av_log(s->avctx, AV_LOG_DEBUG, "lfe: %i\n", s->lfe);

  802.     av_log(s->avctx, AV_LOG_DEBUG, "predictor history: %i\n",

  803.            s->predictor_history);

  804.     av_log(s->avctx, AV_LOG_DEBUG, "header crc: %i\n", s->header_crc);

  805.     av_log(s->avctx, AV_LOG_DEBUG, "multirate inter: %i\n",

  806.            s->multirate_inter);

  807.     av_log(s->avctx, AV_LOG_DEBUG, "version number: %i\n", s->version);

  808.     av_log(s->avctx, AV_LOG_DEBUG, "copy history: %i\n", s->copy_history);

  809.     av_log(s->avctx, AV_LOG_DEBUG,

  810.            "source pcm resolution: %i (%i bits/sample)\n",

  811.            s->source_pcm_res, dca_bits_per_sample[s->source_pcm_res]);

  812.     av_log(s->avctx, AV_LOG_DEBUG, "front sum: %i\n", s->front_sum);

  813.     av_log(s->avctx, AV_LOG_DEBUG, "surround sum: %i\n", s->surround_sum);

  814.     av_log(s->avctx, AV_LOG_DEBUG, "dialog norm: %i\n", s->dialog_norm);

  815.     av_log(s->avctx, AV_LOG_DEBUG, "\n");

  816. #endif

  817. 

  818.     /* Primary audio coding header */

  819.     s->subframes         = get_bits(&s->gb, 4) + 1;

  820. 

  821.     return dca_parse_audio_coding_header(s, 0, 0);

  822. }

  823. 

  824. 

  825. static inline int get_scale(GetBitContext *gb, int level, int value, int log2range)

  826. {

  827.     if (level < 5) {

  828.         /* huffman encoded */

  829.         value += get_bitalloc(gb, &dca_scalefactor, level);

  830.         value = av_clip(value, 0, (1 << log2range) - 1);

  831.     } else if (level < 8) {

  832.         if (level + 1 > log2range) {

  833.             skip_bits(gb, level + 1 - log2range);

  834.             value = get_bits(gb, log2range);

  835.         } else {

  836.             value = get_bits(gb, level + 1);

  837.         }

  838.     }

  839.     return value;

  840. }

  841. 

  842. static int dca_subframe_header(DCAContext *s, int base_channel, int block_index)

  843. {

  844.     /* Primary audio coding side information */

  845.     int j, k;

  846. 

  847.     if (get_bits_left(&s->gb) < 0)

  848.         return AVERROR_INVALIDDATA;

  849. 

  850.     if (!base_channel) {

  851.         s->subsubframes[s->current_subframe]    = get_bits(&s->gb, 2) + 1;

  852.         s->partial_samples[s->current_subframe] = get_bits(&s->gb, 3);

  853.     }

  854. 

  855.     for (j = base_channel; j < s->prim_channels; j++) {

  856.         for (k = 0; k < s->subband_activity[j]; k++)

  857.             s->prediction_mode[j][k] = get_bits(&s->gb, 1);

  858.     }

  859. 

  860.     /* Get prediction codebook */

  861.     for (j = base_channel; j < s->prim_channels; j++) {

  862.         for (k = 0; k < s->subband_activity[j]; k++) {

  863.             if (s->prediction_mode[j][k] > 0) {

  864.                 /* (Prediction coefficient VQ address) */

  865.                 s->prediction_vq[j][k] = get_bits(&s->gb, 12);

  866.             }

  867.         }

  868.     }

  869. 

  870.     /* Bit allocation index */

  871.     for (j = base_channel; j < s->prim_channels; j++) {

  872.         for (k = 0; k < s->vq_start_subband[j]; k++) {

  873.             if (s->bitalloc_huffman[j] == 6)

  874.                 s->bitalloc[j][k] = get_bits(&s->gb, 5);

  875.             else if (s->bitalloc_huffman[j] == 5)

  876.                 s->bitalloc[j][k] = get_bits(&s->gb, 4);

  877.             else if (s->bitalloc_huffman[j] == 7) {

  878.                 av_log(s->avctx, AV_LOG_ERROR,

  879.                        "Invalid bit allocation index\n");

  880.                 return AVERROR_INVALIDDATA;

  881.             } else {

  882.                 s->bitalloc[j][k] =

  883.                     get_bitalloc(&s->gb, &dca_bitalloc_index, s->bitalloc_huffman[j]);

  884.             }

  885. 

  886.             if (s->bitalloc[j][k] > 26) {

  887.                 av_dlog(s->avctx, "bitalloc index [%i][%i] too big (%i)\n",

  888.                         j, k, s->bitalloc[j][k]);

  889.                 return AVERROR_INVALIDDATA;

  890.             }

  891.         }

  892.     }

  893. 

  894.     /* Transition mode */

  895.     for (j = base_channel; j < s->prim_channels; j++) {

  896.         for (k = 0; k < s->subband_activity[j]; k++) {

  897.             s->transition_mode[j][k] = 0;

  898.             if (s->subsubframes[s->current_subframe] > 1 &&

  899.                 k < s->vq_start_subband[j] && s->bitalloc[j][k] > 0) {

  900.                 s->transition_mode[j][k] =

  901.                     get_bitalloc(&s->gb, &dca_tmode, s->transient_huffman[j]);

  902.             }

  903.         }

  904.     }

  905. 

  906.     if (get_bits_left(&s->gb) < 0)

  907.         return AVERROR_INVALIDDATA;

  908. 

  909.     for (j = base_channel; j < s->prim_channels; j++) {

  910.         const uint32_t *scale_table;

  911.         int scale_sum, log_size;

  912. 

  913.         memset(s->scale_factor[j], 0,

  914.                s->subband_activity[j] * sizeof(s->scale_factor[0][0][0]) * 2);

  915. 

  916.         if (s->scalefactor_huffman[j] == 6) {

  917.             scale_table = scale_factor_quant7;

  918.             log_size = 7;

  919.         } else {

  920.             scale_table = scale_factor_quant6;

  921.             log_size = 6;

  922.         }

  923. 

  924.         /* When huffman coded, only the difference is encoded */

  925.         scale_sum = 0;

  926. 

  927.         for (k = 0; k < s->subband_activity[j]; k++) {

  928.             if (k >= s->vq_start_subband[j] || s->bitalloc[j][k] > 0) {

  929.                 scale_sum = get_scale(&s->gb, s->scalefactor_huffman[j], scale_sum, log_size);

  930.                 s->scale_factor[j][k][0] = scale_table[scale_sum];

  931.             }

  932. 

  933.             if (k < s->vq_start_subband[j] && s->transition_mode[j][k]) {

  934.                 /* Get second scale factor */

  935.                 scale_sum = get_scale(&s->gb, s->scalefactor_huffman[j], scale_sum, log_size);

  936.                 s->scale_factor[j][k][1] = scale_table[scale_sum];

  937.             }

  938.         }

  939.     }

  940. 

  941.     /* Joint subband scale factor codebook select */

  942.     for (j = base_channel; j < s->prim_channels; j++) {

  943.         /* Transmitted only if joint subband coding enabled */

  944.         if (s->joint_intensity[j] > 0)

  945.             s->joint_huff[j] = get_bits(&s->gb, 3);

  946.     }

  947. 

  948.     if (get_bits_left(&s->gb) < 0)

  949.         return AVERROR_INVALIDDATA;

  950. 

  951.     /* Scale factors for joint subband coding */

  952.     for (j = base_channel; j < s->prim_channels; j++) {

  953.         int source_channel;

  954. 

  955.         /* Transmitted only if joint subband coding enabled */

  956.         if (s->joint_intensity[j] > 0) {

  957.             int scale = 0;

  958.             source_channel = s->joint_intensity[j] - 1;

  959. 

  960.             /* When huffman coded, only the difference is encoded

  961.              * (is this valid as well for joint scales ???) */

  962. 

  963.             for (k = s->subband_activity[j]; k < s->subband_activity[source_channel]; k++) {

  964.                 scale = get_scale(&s->gb, s->joint_huff[j], 64 /* bias */, 7);

  965.                 s->joint_scale_factor[j][k] = scale;    /*joint_scale_table[scale]; */

  966.             }

  967. 

  968.             if (!(s->debug_flag & 0x02)) {

  969.                 av_log(s->avctx, AV_LOG_DEBUG,

  970.                        "Joint stereo coding not supported\n");

  971.                 s->debug_flag |= 0x02;

  972.             }

  973.         }

  974.     }

  975. 

  976.     /* Dynamic range coefficient */

  977.     if (!base_channel && s->dynrange)

  978.         s->dynrange_coef = get_bits(&s->gb, 8);

  979. 

  980.     /* Side information CRC check word */

  981.     if (s->crc_present) {

  982.         get_bits(&s->gb, 16);

  983.     }

  984. 

  985.     /*

  986.      * Primary audio data arrays

  987.      */

  988. 

  989.     /* VQ encoded high frequency subbands */

  990.     for (j = base_channel; j < s->prim_channels; j++)

  991.         for (k = s->vq_start_subband[j]; k < s->subband_activity[j]; k++)

  992.             /* 1 vector -> 32 samples */

  993.             s->high_freq_vq[j][k] = get_bits(&s->gb, 10);

  994. 

  995.     /* Low frequency effect data */

  996.     if (!base_channel && s->lfe) {

  997.         int quant7;

  998.         /* LFE samples */

  999.         int lfe_samples = 2 * s->lfe * (4 + block_index);

  1000.         int lfe_end_sample = 2 * s->lfe * (4 + block_index + s->subsubframes[s->current_subframe]);

  1001.         float lfe_scale;

  1002. 

  1003.         for (j = lfe_samples; j < lfe_end_sample; j++) {

  1004.             /* Signed 8 bits int */

  1005.             s->lfe_data[j] = get_sbits(&s->gb, 8);

  1006.         }

  1007. 

  1008.         /* Scale factor index */

  1009.         quant7 = get_bits(&s->gb, 8);

  1010.         if (quant7 > 127) {

  1011.             avpriv_request_sample(s->avctx, "LFEScaleIndex larger than 127");

  1012.             return AVERROR_INVALIDDATA;

  1013.         }

  1014.         s->lfe_scale_factor = scale_factor_quant7[quant7];

  1015. 

  1016.         /* Quantization step size * scale factor */

  1017.         lfe_scale = 0.035 * s->lfe_scale_factor;

  1018. 

  1019.         for (j = lfe_samples; j < lfe_end_sample; j++)

  1020.             s->lfe_data[j] *= lfe_scale;

  1021.     }

  1022. 

  1023. #ifdef TRACE

  1024.     av_log(s->avctx, AV_LOG_DEBUG, "subsubframes: %i\n",

  1025.            s->subsubframes[s->current_subframe]);

  1026.     av_log(s->avctx, AV_LOG_DEBUG, "partial samples: %i\n",

  1027.            s->partial_samples[s->current_subframe]);

  1028. 

  1029.     for (j = base_channel; j < s->prim_channels; j++) {

  1030.         av_log(s->avctx, AV_LOG_DEBUG, "prediction mode:");

  1031.         for (k = 0; k < s->subband_activity[j]; k++)

  1032.             av_log(s->avctx, AV_LOG_DEBUG, " %i", s->prediction_mode[j][k]);

  1033.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1034.     }

  1035.     for (j = base_channel; j < s->prim_channels; j++) {

  1036.         for (k = 0; k < s->subband_activity[j]; k++)

  1037.             av_log(s->avctx, AV_LOG_DEBUG,

  1038.                    "prediction coefs: %f, %f, %f, %f\n",

  1039.                    (float) adpcm_vb[s->prediction_vq[j][k]][0] / 8192,

  1040.                    (float) adpcm_vb[s->prediction_vq[j][k]][1] / 8192,

  1041.                    (float) adpcm_vb[s->prediction_vq[j][k]][2] / 8192,

  1042.                    (float) adpcm_vb[s->prediction_vq[j][k]][3] / 8192);

  1043.     }

  1044.     for (j = base_channel; j < s->prim_channels; j++) {

  1045.         av_log(s->avctx, AV_LOG_DEBUG, "bitalloc index: ");

  1046.         for (k = 0; k < s->vq_start_subband[j]; k++)

  1047.             av_log(s->avctx, AV_LOG_DEBUG, "%2.2i ", s->bitalloc[j][k]);

  1048.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1049.     }

  1050.     for (j = base_channel; j < s->prim_channels; j++) {

  1051.         av_log(s->avctx, AV_LOG_DEBUG, "Transition mode:");

  1052.         for (k = 0; k < s->subband_activity[j]; k++)

  1053.             av_log(s->avctx, AV_LOG_DEBUG, " %i", s->transition_mode[j][k]);

  1054.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1055.     }

  1056.     for (j = base_channel; j < s->prim_channels; j++) {

  1057.         av_log(s->avctx, AV_LOG_DEBUG, "Scale factor:");

  1058.         for (k = 0; k < s->subband_activity[j]; k++) {

  1059.             if (k >= s->vq_start_subband[j] || s->bitalloc[j][k] > 0)

  1060.                 av_log(s->avctx, AV_LOG_DEBUG, " %i", s->scale_factor[j][k][0]);

  1061.             if (k < s->vq_start_subband[j] && s->transition_mode[j][k])

  1062.                 av_log(s->avctx, AV_LOG_DEBUG, " %i(t)", s->scale_factor[j][k][1]);

  1063.         }

  1064.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1065.     }

  1066.     for (j = base_channel; j < s->prim_channels; j++) {

  1067.         if (s->joint_intensity[j] > 0) {

  1068.             int source_channel = s->joint_intensity[j] - 1;

  1069.             av_log(s->avctx, AV_LOG_DEBUG, "Joint scale factor index:\n");

  1070.             for (k = s->subband_activity[j]; k < s->subband_activity[source_channel]; k++)

  1071.                 av_log(s->avctx, AV_LOG_DEBUG, " %i", s->joint_scale_factor[j][k]);

  1072.             av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1073.         }

  1074.     }

  1075.     for (j = base_channel; j < s->prim_channels; j++)

  1076.         for (k = s->vq_start_subband[j]; k < s->subband_activity[j]; k++)

  1077.             av_log(s->avctx, AV_LOG_DEBUG, "VQ index: %i\n", s->high_freq_vq[j][k]);

  1078.     if (!base_channel && s->lfe) {

  1079.         int lfe_samples = 2 * s->lfe * (4 + block_index);

  1080.         int lfe_end_sample = 2 * s->lfe * (4 + block_index + s->subsubframes[s->current_subframe]);

  1081. 

  1082.         av_log(s->avctx, AV_LOG_DEBUG, "LFE samples:\n");

  1083.         for (j = lfe_samples; j < lfe_end_sample; j++)

  1084.             av_log(s->avctx, AV_LOG_DEBUG, " %f", s->lfe_data[j]);

  1085.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1086.     }

  1087. #endif

  1088. 

  1089.     return 0;

  1090. }

  1091. 

  1092. static void qmf_32_subbands(DCAContext *s, int chans,

  1093.                             float samples_in[32][8], float *samples_out,

  1094.                             float scale)

  1095. {

  1096.     const float *prCoeff;

  1097. 

  1098.     int sb_act = s->subband_activity[chans];

  1099. 

  1100.     scale *= sqrt(1 / 8.0);

  1101. 

  1102.     /* Select filter */

  1103.     if (!s->multirate_inter)    /* Non-perfect reconstruction */

  1104.         prCoeff = fir_32bands_nonperfect;

  1105.     else                        /* Perfect reconstruction */

  1106.         prCoeff = fir_32bands_perfect;

  1107. 

  1108.     s->dcadsp.qmf_32_subbands(samples_in, sb_act, &s->synth, &s->imdct,

  1109.                               s->subband_fir_hist[chans],

  1110.                               &s->hist_index[chans],

  1111.                               s->subband_fir_noidea[chans], prCoeff,

  1112.                               samples_out, s->raXin, scale);

  1113. }

  1114. 

  1115. static void lfe_interpolation_fir(DCAContext *s, int decimation_select,

  1116.                                   int num_deci_sample, float *samples_in,

  1117.                                   float *samples_out)

  1118. {

  1119.     /* samples_in: An array holding decimated samples.

  1120.      *   Samples in current subframe starts from samples_in[0],

  1121.      *   while samples_in[-1], samples_in[-2], ..., stores samples

  1122.      *   from last subframe as history.

  1123.      *

  1124.      * samples_out: An array holding interpolated samples

  1125.      */

  1126. 

  1127.     int idx;

  1128.     const float *prCoeff;

  1129.     int deciindex;

  1130. 

  1131.     /* Select decimation filter */

  1132.     if (decimation_select == 1) {

  1133.         idx = 1;

  1134.         prCoeff = lfe_fir_128;

  1135.     } else {

  1136.         idx = 0;

  1137.         prCoeff = lfe_fir_64;

  1138.     }

  1139.     /* Interpolation */

  1140.     for (deciindex = 0; deciindex < num_deci_sample; deciindex++) {

  1141.         s->dcadsp.lfe_fir[idx](samples_out, samples_in, prCoeff);

  1142.         samples_in++;

  1143.         samples_out += 2 * 32 * (1 + idx);

  1144.     }

  1145. }

  1146. 

  1147. /* downmixing routines */

  1148. #define MIX_REAR1(samples, s1, rs, coef)            \

  1149.     samples[0][i] += samples[s1][i] * coef[rs][0];  \

  1150.     samples[1][i] += samples[s1][i] * coef[rs][1];

  1151. 

  1152. #define MIX_REAR2(samples, s1, s2, rs, coef)                                          \

  1153.     samples[0][i] += samples[s1][i] * coef[rs][0] + samples[s2][i] * coef[rs + 1][0]; \

  1154.     samples[1][i] += samples[s1][i] * coef[rs][1] + samples[s2][i] * coef[rs + 1][1];

  1155. 

  1156. #define MIX_FRONT3(samples, coef)                                      \

  1157.     t = samples[c][i];                                                 \

  1158.     u = samples[l][i];                                                 \

  1159.     v = samples[r][i];                                                 \

  1160.     samples[0][i] = t * coef[0][0] + u * coef[1][0] + v * coef[2][0];  \

  1161.     samples[1][i] = t * coef[0][1] + u * coef[1][1] + v * coef[2][1];

  1162. 

  1163. #define DOWNMIX_TO_STEREO(op1, op2)             \

  1164.     for (i = 0; i < 256; i++) {                 \

  1165.         op1                                     \

  1166.         op2                                     \

  1167.     }

  1168. 

  1169. static void dca_downmix(float **samples, int srcfmt, int lfe_present,

  1170.                         float coef[DCA_PRIM_CHANNELS_MAX + 1][2],

  1171.                         const int8_t *channel_mapping)

  1172. {

  1173.     int c, l, r, sl, sr, s;

  1174.     int i;

  1175.     float t, u, v;

  1176. 

  1177.     switch (srcfmt) {

  1178.     case DCA_MONO:

  1179.     case DCA_4F2R:

  1180.         av_log(NULL, AV_LOG_ERROR, "Not implemented!\n");

  1181.         break;

  1182.     case DCA_CHANNEL:

  1183.     case DCA_STEREO:

  1184.     case DCA_STEREO_TOTAL:

  1185.     case DCA_STEREO_SUMDIFF:

  1186.         break;

  1187.     case DCA_3F:

  1188.         c = channel_mapping[0];

  1189.         l = channel_mapping[1];

  1190.         r = channel_mapping[2];

  1191.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef), );

  1192.         break;

  1193.     case DCA_2F1R:

  1194.         s = channel_mapping[2];

  1195.         DOWNMIX_TO_STEREO(MIX_REAR1(samples, s, 2, coef), );

  1196.         break;

  1197.     case DCA_3F1R:

  1198.         c = channel_mapping[0];

  1199.         l = channel_mapping[1];

  1200.         r = channel_mapping[2];

  1201.         s = channel_mapping[3];

  1202.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),

  1203.                           MIX_REAR1(samples, s, 3, coef));

  1204.         break;

  1205.     case DCA_2F2R:

  1206.         sl = channel_mapping[2];

  1207.         sr = channel_mapping[3];

  1208.         DOWNMIX_TO_STEREO(MIX_REAR2(samples, sl, sr, 2, coef), );

  1209.         break;

  1210.     case DCA_3F2R:

  1211.         c  = channel_mapping[0];

  1212.         l  = channel_mapping[1];

  1213.         r  = channel_mapping[2];

  1214.         sl = channel_mapping[3];

  1215.         sr = channel_mapping[4];

  1216.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),

  1217.                           MIX_REAR2(samples, sl, sr, 3, coef));

  1218.         break;

  1219.     }

  1220.     if (lfe_present) {

  1221.         int lf_buf = dca_lfe_index[srcfmt];

  1222.         int lf_idx = dca_channels [srcfmt];

  1223.         for (i = 0; i < 256; i++) {

  1224.             samples[0][i] += samples[lf_buf][i] * coef[lf_idx][0];

  1225.             samples[1][i] += samples[lf_buf][i] * coef[lf_idx][1];

  1226.         }

  1227.     }

  1228. }

  1229. 

  1230. 

  1231. #ifndef decode_blockcodes

  1232. /* Very compact version of the block code decoder that does not use table

  1233.  * look-up but is slightly slower */

  1234. static int decode_blockcode(int code, int levels, int32_t *values)

  1235. {

  1236.     int i;

  1237.     int offset = (levels - 1) >> 1;

  1238. 

  1239.     for (i = 0; i < 4; i++) {

  1240.         int div = FASTDIV(code, levels);

  1241.         values[i] = code - offset - div * levels;

  1242.         code = div;

  1243.     }

  1244. 

  1245.     return code;

  1246. }

  1247. 

  1248. static int decode_blockcodes(int code1, int code2, int levels, int32_t *values)

  1249. {

  1250.     return decode_blockcode(code1, levels, values) |

  1251.            decode_blockcode(code2, levels, values + 4);

  1252. }

  1253. #endif

  1254. 

  1255. static const uint8_t abits_sizes[7]  = { 7, 10, 12, 13, 15, 17, 19 };

  1256. static const uint8_t abits_levels[7] = { 3,  5,  7,  9, 13, 17, 25 };

  1257. 

  1258. static int dca_subsubframe(DCAContext *s, int base_channel, int block_index)

  1259. {

  1260.     int k, l;

  1261.     int subsubframe = s->current_subsubframe;

  1262. 

  1263.     const float *quant_step_table;

  1264. 

  1265.     /* FIXME */

  1266.     float (*subband_samples)[DCA_SUBBANDS][8] = s->subband_samples[block_index];

  1267.     LOCAL_ALIGNED_16(int32_t, block, [8 * DCA_SUBBANDS]);

  1268. 

  1269.     /*

  1270.      * Audio data

  1271.      */

  1272. 

  1273.     /* Select quantization step size table */

  1274.     if (s->bit_rate_index == 0x1f)

  1275.         quant_step_table = lossless_quant_d;

  1276.     else

  1277.         quant_step_table = lossy_quant_d;

  1278. 

  1279.     for (k = base_channel; k < s->prim_channels; k++) {

  1280.         float rscale[DCA_SUBBANDS];

  1281. 

  1282.         if (get_bits_left(&s->gb) < 0)

  1283.             return AVERROR_INVALIDDATA;

  1284. 

  1285.         for (l = 0; l < s->vq_start_subband[k]; l++) {

  1286.             int m;

  1287. 

  1288.             /* Select the mid-tread linear quantizer */

  1289.             int abits = s->bitalloc[k][l];

  1290. 

  1291.             float quant_step_size = quant_step_table[abits];

  1292. 

  1293.             /*

  1294.              * Determine quantization index code book and its type

  1295.              */

  1296. 

  1297.             /* Select quantization index code book */

  1298.             int sel = s->quant_index_huffman[k][abits];

  1299. 

  1300.             /*

  1301.              * Extract bits from the bit stream

  1302.              */

  1303.             if (!abits) {

  1304.                 rscale[l] = 0;

  1305.                 memset(block + 8 * l, 0, 8 * sizeof(block[0]));

  1306.             } else {

  1307.                 /* Deal with transients */

  1308.                 int sfi = s->transition_mode[k][l] && subsubframe >= s->transition_mode[k][l];

  1309.                 rscale[l] = quant_step_size * s->scale_factor[k][l][sfi] *

  1310.                                s->scalefactor_adj[k][sel];

  1311. 

  1312.                 if (abits >= 11 || !dca_smpl_bitalloc[abits].vlc[sel].table) {

  1313.                     if (abits <= 7) {

  1314.                         /* Block code */

  1315.                         int block_code1, block_code2, size, levels, err;

  1316. 

  1317.                         size   = abits_sizes[abits - 1];

  1318.                         levels = abits_levels[abits - 1];

  1319. 

  1320.                         block_code1 = get_bits(&s->gb, size);

  1321.                         block_code2 = get_bits(&s->gb, size);

  1322.                         err = decode_blockcodes(block_code1, block_code2,

  1323.                                                 levels, block + 8 * l);

  1324.                         if (err) {

  1325.                             av_log(s->avctx, AV_LOG_ERROR,

  1326.                                    "ERROR: block code look-up failed\n");

  1327.                             return AVERROR_INVALIDDATA;

  1328.                         }

  1329.                     } else {

  1330.                         /* no coding */

  1331.                         for (m = 0; m < 8; m++)

  1332.                             block[8 * l + m] = get_sbits(&s->gb, abits - 3);

  1333.                     }

  1334.                 } else {

  1335.                     /* Huffman coded */

  1336.                     for (m = 0; m < 8; m++)

  1337.                         block[8 * l + m] = get_bitalloc(&s->gb,

  1338.                                                 &dca_smpl_bitalloc[abits], sel);

  1339.                 }

  1340. 

  1341.             }

  1342.         }

  1343. 

  1344.         s->fmt_conv.int32_to_float_fmul_array8(&s->fmt_conv, subband_samples[k][0],

  1345.                                                block, rscale, 8 * s->vq_start_subband[k]);

  1346. 

  1347.         for (l = 0; l < s->vq_start_subband[k]; l++) {

  1348.             int m;

  1349.             /*

  1350.              * Inverse ADPCM if in prediction mode

  1351.              */

  1352.             if (s->prediction_mode[k][l]) {

  1353.                 int n;

  1354.                 if (s->predictor_history)

  1355.                     subband_samples[k][l][0] += (adpcm_vb[s->prediction_vq[k][l]][0] *

  1356.                                                  s->subband_samples_hist[k][l][3] +

  1357.                                                  adpcm_vb[s->prediction_vq[k][l]][1] *

  1358.                                                  s->subband_samples_hist[k][l][2] +

  1359.                                                  adpcm_vb[s->prediction_vq[k][l]][2] *

  1360.                                                  s->subband_samples_hist[k][l][1] +

  1361.                                                  adpcm_vb[s->prediction_vq[k][l]][3] *

  1362.                                                  s->subband_samples_hist[k][l][0]) *

  1363.                                                 (1.0f / 8192);

  1364.                 for (m = 1; m < 8; m++) {

  1365.                     float sum = adpcm_vb[s->prediction_vq[k][l]][0] *

  1366.                                 subband_samples[k][l][m - 1];

  1367.                     for (n = 2; n <= 4; n++)

  1368.                         if (m >= n)

  1369.                             sum += adpcm_vb[s->prediction_vq[k][l]][n - 1] *

  1370.                                    subband_samples[k][l][m - n];

  1371.                         else if (s->predictor_history)

  1372.                             sum += adpcm_vb[s->prediction_vq[k][l]][n - 1] *

  1373.                                    s->subband_samples_hist[k][l][m - n + 4];

  1374.                     subband_samples[k][l][m] += sum * (1.0f / 8192);

  1375.                 }

  1376.             }

  1377.         }

  1378. 

  1379.         /*

  1380.          * Decode VQ encoded high frequencies

  1381.          */

  1382.         if (s->subband_activity[k] > s->vq_start_subband[k]) {

  1383.             if (!(s->debug_flag & 0x01)) {

  1384.                 av_log(s->avctx, AV_LOG_DEBUG,

  1385.                        "Stream with high frequencies VQ coding\n");

  1386.                 s->debug_flag |= 0x01;

  1387.             }

  1388.             s->dcadsp.decode_hf(subband_samples[k], s->high_freq_vq[k],

  1389.                                 high_freq_vq, subsubframe * 8,

  1390.                                 s->scale_factor[k], s->vq_start_subband[k],

  1391.                                 s->subband_activity[k]);

  1392.         }

  1393.     }

  1394. 

  1395.     /* Check for DSYNC after subsubframe */

  1396.     if (s->aspf || subsubframe == s->subsubframes[s->current_subframe] - 1) {

  1397.         if (0xFFFF == get_bits(&s->gb, 16)) {   /* 0xFFFF */

  1398. #ifdef TRACE

  1399.             av_log(s->avctx, AV_LOG_DEBUG, "Got subframe DSYNC\n");

  1400. #endif

  1401.         } else {

  1402.             av_log(s->avctx, AV_LOG_ERROR, "Didn't get subframe DSYNC\n");

  1403.             return AVERROR_INVALIDDATA;

  1404.         }

  1405.     }

  1406. 

  1407.     /* Backup predictor history for adpcm */

  1408.     for (k = base_channel; k < s->prim_channels; k++)

  1409.         for (l = 0; l < s->vq_start_subband[k]; l++)

  1410.             AV_COPY128(s->subband_samples_hist[k][l], &subband_samples[k][l][4]);

  1411. 

  1412.     return 0;

  1413. }

  1414. 

  1415. static int dca_filter_channels(DCAContext *s, int block_index)

  1416. {

  1417.     float (*subband_samples)[DCA_SUBBANDS][8] = s->subband_samples[block_index];

  1418.     int k;

  1419. 

  1420.     /* 32 subbands QMF */

  1421.     for (k = 0; k < s->prim_channels; k++) {

  1422. /*        static float pcm_to_double[8] = { 32768.0, 32768.0, 524288.0, 524288.0,

  1423.                                             0, 8388608.0, 8388608.0 };*/

  1424.         if (s->channel_order_tab[k] >= 0)

  1425.             qmf_32_subbands(s, k, subband_samples[k],

  1426.                             s->samples_chanptr[s->channel_order_tab[k]],

  1427.                             M_SQRT1_2 / 32768.0 /* pcm_to_double[s->source_pcm_res] */);

  1428.     }

  1429. 

  1430.     /* Generate LFE samples for this subsubframe FIXME!!! */

  1431.     if (s->lfe) {

  1432.         lfe_interpolation_fir(s, s->lfe, 2 * s->lfe,

  1433.                               s->lfe_data + 2 * s->lfe * (block_index + 4),

  1434.                               s->samples_chanptr[s->lfe_index]);

  1435.         /* Outputs 20bits pcm samples */

  1436.     }

  1437. 

  1438.     /* Downmixing to Stereo */

  1439.     if (s->prim_channels + !!s->lfe > 2 &&

  1440.         s->avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {

  1441.         dca_downmix(s->samples_chanptr, s->amode, !!s->lfe, s->downmix_coef,

  1442.                     s->channel_order_tab);

  1443.     }

  1444. 

  1445.     return 0;

  1446. }

  1447. 

  1448. 

  1449. static int dca_subframe_footer(DCAContext *s, int base_channel)

  1450. {

  1451.     int in, out, aux_data_count, aux_data_end, reserved;

  1452.     uint32_t nsyncaux;

  1453. 

  1454.     /*

  1455.      * Unpack optional information

  1456.      */

  1457. 

  1458.     /* presumably optional information only appears in the core? */

  1459.     if (!base_channel) {

  1460.         if (s->timestamp)

  1461.             skip_bits_long(&s->gb, 32);

  1462. 

  1463.         if (s->aux_data) {

  1464.             aux_data_count = get_bits(&s->gb, 6);

  1465. 

  1466.             // align (32-bit)

  1467.             skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);

  1468. 

  1469.             aux_data_end = 8 * aux_data_count + get_bits_count(&s->gb);

  1470. 

  1471.             if ((nsyncaux = get_bits_long(&s->gb, 32)) != DCA_NSYNCAUX) {

  1472.                 av_log(s->avctx, AV_LOG_ERROR, "nSYNCAUX mismatch %#"PRIx32"\n",

  1473.                        nsyncaux);

  1474.                 return AVERROR_INVALIDDATA;

  1475.             }

  1476. 

  1477.             if (get_bits1(&s->gb)) { // bAUXTimeStampFlag

  1478.                 avpriv_request_sample(s->avctx,

  1479.                                       "Auxiliary Decode Time Stamp Flag");

  1480.                 // align (4-bit)

  1481.                 skip_bits(&s->gb, (-get_bits_count(&s->gb)) & 4);

  1482.                 // 44 bits: nMSByte (8), nMarker (4), nLSByte (28), nMarker (4)

  1483.                 skip_bits_long(&s->gb, 44);

  1484.             }

  1485. 

  1486.             if ((s->core_downmix = get_bits1(&s->gb))) {

  1487.                 int am = get_bits(&s->gb, 3);

  1488.                 switch (am) {

  1489.                 case 0:

  1490.                     s->core_downmix_amode = DCA_MONO;

  1491.                     break;

  1492.                 case 1:

  1493.                     s->core_downmix_amode = DCA_STEREO;

  1494.                     break;

  1495.                 case 2:

  1496.                     s->core_downmix_amode = DCA_STEREO_TOTAL;

  1497.                     break;

  1498.                 case 3:

  1499.                     s->core_downmix_amode = DCA_3F;

  1500.                     break;

  1501.                 case 4:

  1502.                     s->core_downmix_amode = DCA_2F1R;

  1503.                     break;

  1504.                 case 5:

  1505.                     s->core_downmix_amode = DCA_2F2R;

  1506.                     break;

  1507.                 case 6:

  1508.                     s->core_downmix_amode = DCA_3F1R;

  1509.                     break;

  1510.                 default:

  1511.                     av_log(s->avctx, AV_LOG_ERROR,

  1512.                            "Invalid mode %d for embedded downmix coefficients\n",

  1513.                            am);

  1514.                     return AVERROR_INVALIDDATA;

  1515.                 }

  1516.                 for (out = 0; out < dca_channels[s->core_downmix_amode]; out++) {

  1517.                     for (in = 0; in < s->prim_channels + !!s->lfe; in++) {

  1518.                         uint16_t tmp = get_bits(&s->gb, 9);

  1519.                         if ((tmp & 0xFF) > 241) {

  1520.                             av_log(s->avctx, AV_LOG_ERROR,

  1521.                                    "Invalid downmix coefficient code %"PRIu16"\n",

  1522.                                    tmp);

  1523.                             return AVERROR_INVALIDDATA;

  1524.                         }

  1525.                         s->core_downmix_codes[in][out] = tmp;

  1526.                     }

  1527.                 }

  1528.             }

  1529. 

  1530.             align_get_bits(&s->gb); // byte align

  1531.             skip_bits(&s->gb, 16);  // nAUXCRC16

  1532. 

  1533.             // additional data (reserved, cf. ETSI TS 102 114 V1.4.1)

  1534.             if ((reserved = (aux_data_end - get_bits_count(&s->gb))) < 0) {

  1535.                  av_log(s->avctx, AV_LOG_ERROR,

  1536.                         "Overread auxiliary data by %d bits\n", -reserved);

  1537.                 return AVERROR_INVALIDDATA;

  1538.             } else if (reserved) {

  1539.                 avpriv_request_sample(s->avctx,

  1540.                                       "Core auxiliary data reserved content");

  1541.                 skip_bits_long(&s->gb, reserved);

  1542.             }

  1543.         }

  1544. 

  1545.         if (s->crc_present && s->dynrange)

  1546.             get_bits(&s->gb, 16);

  1547.     }

  1548. 

  1549.     return 0;

  1550. }

  1551. 

  1552. /**

  1553.  * Decode a dca frame block

  1554.  *

  1555.  * @param s     pointer to the DCAContext

  1556.  */

  1557. 

  1558. static int dca_decode_block(DCAContext *s, int base_channel, int block_index)

  1559. {

  1560.     int ret;

  1561. 

  1562.     /* Sanity check */

  1563.     if (s->current_subframe >= s->subframes) {

  1564.         av_log(s->avctx, AV_LOG_DEBUG, "check failed: %i>%i",

  1565.                s->current_subframe, s->subframes);

  1566.         return AVERROR_INVALIDDATA;

  1567.     }

  1568. 

  1569.     if (!s->current_subsubframe) {

  1570. #ifdef TRACE

  1571.         av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subframe_header\n");

  1572. #endif

  1573.         /* Read subframe header */

  1574.         if ((ret = dca_subframe_header(s, base_channel, block_index)))

  1575.             return ret;

  1576.     }

  1577. 

  1578.     /* Read subsubframe */

  1579. #ifdef TRACE

  1580.     av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subsubframe\n");

  1581. #endif

  1582.     if ((ret = dca_subsubframe(s, base_channel, block_index)))

  1583.         return ret;

  1584. 

  1585.     /* Update state */

  1586.     s->current_subsubframe++;

  1587.     if (s->current_subsubframe >= s->subsubframes[s->current_subframe]) {

  1588.         s->current_subsubframe = 0;

  1589.         s->current_subframe++;

  1590.     }

  1591.     if (s->current_subframe >= s->subframes) {

  1592. #ifdef TRACE

  1593.         av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subframe_footer\n");

  1594. #endif

  1595.         /* Read subframe footer */

  1596.         if ((ret = dca_subframe_footer(s, base_channel)))

  1597.             return ret;

  1598.     }

  1599. 

  1600.     return 0;

  1601. }

  1602. 

  1603. /**

  1604.  * Return the number of channels in an ExSS speaker mask (HD)

  1605.  */

  1606. static int dca_exss_mask2count(int mask)

  1607. {

  1608.     /* count bits that mean speaker pairs twice */

  1609.     return av_popcount(mask) +

  1610.            av_popcount(mask & (DCA_EXSS_CENTER_LEFT_RIGHT      |

  1611.                                DCA_EXSS_FRONT_LEFT_RIGHT       |

  1612.                                DCA_EXSS_FRONT_HIGH_LEFT_RIGHT  |

  1613.                                DCA_EXSS_WIDE_LEFT_RIGHT        |

  1614.                                DCA_EXSS_SIDE_LEFT_RIGHT        |

  1615.                                DCA_EXSS_SIDE_HIGH_LEFT_RIGHT   |

  1616.                                DCA_EXSS_SIDE_REAR_LEFT_RIGHT   |

  1617.                                DCA_EXSS_REAR_LEFT_RIGHT        |

  1618.                                DCA_EXSS_REAR_HIGH_LEFT_RIGHT));

  1619. }

  1620. 

  1621. /**

  1622.  * Skip mixing coefficients of a single mix out configuration (HD)

  1623.  */

  1624. static void dca_exss_skip_mix_coeffs(GetBitContext *gb, int channels, int out_ch)

  1625. {

  1626.     int i;

  1627. 

  1628.     for (i = 0; i < channels; i++) {

  1629.         int mix_map_mask = get_bits(gb, out_ch);

  1630.         int num_coeffs = av_popcount(mix_map_mask);

  1631.         skip_bits_long(gb, num_coeffs * 6);

  1632.     }

  1633. }

  1634. 

  1635. /**

  1636.  * Parse extension substream asset header (HD)

  1637.  */

  1638. static int dca_exss_parse_asset_header(DCAContext *s)

  1639. {

  1640.     int header_pos = get_bits_count(&s->gb);

  1641.     int header_size;

  1642.     int channels = 0;

  1643.     int embedded_stereo = 0;

  1644.     int embedded_6ch    = 0;

  1645.     int drc_code_present;

  1646.     int av_uninit(extensions_mask);

  1647.     int i, j;

  1648. 

  1649.     if (get_bits_left(&s->gb) < 16)

  1650.         return -1;

  1651. 

  1652.     /* We will parse just enough to get to the extensions bitmask with which

  1653.      * we can set the profile value. */

  1654. 

  1655.     header_size = get_bits(&s->gb, 9) + 1;

  1656.     skip_bits(&s->gb, 3); // asset index

  1657. 

  1658.     if (s->static_fields) {

  1659.         if (get_bits1(&s->gb))

  1660.             skip_bits(&s->gb, 4); // asset type descriptor

  1661.         if (get_bits1(&s->gb))

  1662.             skip_bits_long(&s->gb, 24); // language descriptor

  1663. 

  1664.         if (get_bits1(&s->gb)) {

  1665.             /* How can one fit 1024 bytes of text here if the maximum value

  1666.              * for the asset header size field above was 512 bytes? */

  1667.             int text_length = get_bits(&s->gb, 10) + 1;

  1668.             if (get_bits_left(&s->gb) < text_length * 8)

  1669.                 return -1;

  1670.             skip_bits_long(&s->gb, text_length * 8); // info text

  1671.         }

  1672. 

  1673.         skip_bits(&s->gb, 5); // bit resolution - 1

  1674.         skip_bits(&s->gb, 4); // max sample rate code

  1675.         channels = get_bits(&s->gb, 8) + 1;

  1676. 

  1677.         if (get_bits1(&s->gb)) { // 1-to-1 channels to speakers

  1678.             int spkr_remap_sets;

  1679.             int spkr_mask_size = 16;

  1680.             int num_spkrs[7];

  1681. 

  1682.             if (channels > 2)

  1683.                 embedded_stereo = get_bits1(&s->gb);

  1684.             if (channels > 6)

  1685.                 embedded_6ch = get_bits1(&s->gb);

  1686. 

  1687.             if (get_bits1(&s->gb)) {

  1688.                 spkr_mask_size = (get_bits(&s->gb, 2) + 1) << 2;

  1689.                 skip_bits(&s->gb, spkr_mask_size); // spkr activity mask

  1690.             }

  1691. 

  1692.             spkr_remap_sets = get_bits(&s->gb, 3);

  1693. 

  1694.             for (i = 0; i < spkr_remap_sets; i++) {

  1695.                 /* std layout mask for each remap set */

  1696.                 num_spkrs[i] = dca_exss_mask2count(get_bits(&s->gb, spkr_mask_size));

  1697.             }

  1698. 

  1699.             for (i = 0; i < spkr_remap_sets; i++) {

  1700.                 int num_dec_ch_remaps = get_bits(&s->gb, 5) + 1;

  1701.                 if (get_bits_left(&s->gb) < 0)

  1702.                     return -1;

  1703. 

  1704.                 for (j = 0; j < num_spkrs[i]; j++) {

  1705.                     int remap_dec_ch_mask = get_bits_long(&s->gb, num_dec_ch_remaps);

  1706.                     int num_dec_ch = av_popcount(remap_dec_ch_mask);

  1707.                     skip_bits_long(&s->gb, num_dec_ch * 5); // remap codes

  1708.                 }

  1709.             }

  1710. 

  1711.         } else {

  1712.             skip_bits(&s->gb, 3); // representation type

  1713.         }

  1714.     }

  1715. 

  1716.     drc_code_present = get_bits1(&s->gb);

  1717.     if (drc_code_present)

  1718.         get_bits(&s->gb, 8); // drc code

  1719. 

  1720.     if (get_bits1(&s->gb))

  1721.         skip_bits(&s->gb, 5); // dialog normalization code

  1722. 

  1723.     if (drc_code_present && embedded_stereo)

  1724.         get_bits(&s->gb, 8); // drc stereo code

  1725. 

  1726.     if (s->mix_metadata && get_bits1(&s->gb)) {

  1727.         skip_bits(&s->gb, 1); // external mix

  1728.         skip_bits(&s->gb, 6); // post mix gain code

  1729. 

  1730.         if (get_bits(&s->gb, 2) != 3) // mixer drc code

  1731.             skip_bits(&s->gb, 3); // drc limit

  1732.         else

  1733.             skip_bits(&s->gb, 8); // custom drc code

  1734. 

  1735.         if (get_bits1(&s->gb)) // channel specific scaling

  1736.             for (i = 0; i < s->num_mix_configs; i++)

  1737.                 skip_bits_long(&s->gb, s->mix_config_num_ch[i] * 6); // scale codes

  1738.         else

  1739.             skip_bits_long(&s->gb, s->num_mix_configs * 6); // scale codes

  1740. 

  1741.         for (i = 0; i < s->num_mix_configs; i++) {

  1742.             if (get_bits_left(&s->gb) < 0)

  1743.                 return -1;

  1744.             dca_exss_skip_mix_coeffs(&s->gb, channels, s->mix_config_num_ch[i]);

  1745.             if (embedded_6ch)

  1746.                 dca_exss_skip_mix_coeffs(&s->gb, 6, s->mix_config_num_ch[i]);

  1747.             if (embedded_stereo)

  1748.                 dca_exss_skip_mix_coeffs(&s->gb, 2, s->mix_config_num_ch[i]);

  1749.         }

  1750.     }

  1751. 

  1752.     switch (get_bits(&s->gb, 2)) {

  1753.     case 0: extensions_mask = get_bits(&s->gb, 12); break;

  1754.     case 1: extensions_mask = DCA_EXT_EXSS_XLL;     break;

  1755.     case 2: extensions_mask = DCA_EXT_EXSS_LBR;     break;

  1756.     case 3: extensions_mask = 0; /* aux coding */   break;

  1757.     }

  1758. 

  1759.     /* not parsed further, we were only interested in the extensions mask */

  1760. 

  1761.     if (get_bits_left(&s->gb) < 0)

  1762.         return -1;

  1763. 

  1764.     if (get_bits_count(&s->gb) - header_pos > header_size * 8) {

  1765.         av_log(s->avctx, AV_LOG_WARNING, "Asset header size mismatch.\n");

  1766.         return -1;

  1767.     }

  1768.     skip_bits_long(&s->gb, header_pos + header_size * 8 - get_bits_count(&s->gb));

  1769. 

  1770.     if (extensions_mask & DCA_EXT_EXSS_XLL)

  1771.         s->profile = FF_PROFILE_DTS_HD_MA;

  1772.     else if (extensions_mask & (DCA_EXT_EXSS_XBR | DCA_EXT_EXSS_X96 |

  1773.                                 DCA_EXT_EXSS_XXCH))

  1774.         s->profile = FF_PROFILE_DTS_HD_HRA;

  1775. 

  1776.     if (!(extensions_mask & DCA_EXT_CORE))

  1777.         av_log(s->avctx, AV_LOG_WARNING, "DTS core detection mismatch.\n");

  1778.     if ((extensions_mask & DCA_CORE_EXTS) != s->core_ext_mask)

  1779.         av_log(s->avctx, AV_LOG_WARNING,

  1780.                "DTS extensions detection mismatch (%d, %d)\n",

  1781.                extensions_mask & DCA_CORE_EXTS, s->core_ext_mask);

  1782. 

  1783.     return 0;

  1784. }

  1785. 

  1786. static int dca_xbr_parse_frame(DCAContext *s)

  1787. {

  1788.     int scale_table_high[DCA_CHSET_CHANS_MAX][DCA_SUBBANDS][2];

  1789.     int active_bands[DCA_CHSETS_MAX][DCA_CHSET_CHANS_MAX];

  1790.     int abits_high[DCA_CHSET_CHANS_MAX][DCA_SUBBANDS];

  1791.     int anctemp[DCA_CHSET_CHANS_MAX];

  1792.     int chset_fsize[DCA_CHSETS_MAX];

  1793.     int n_xbr_ch[DCA_CHSETS_MAX];

  1794.     int hdr_size, num_chsets, xbr_tmode, hdr_pos;

  1795.     int i, j, k, l, chset, chan_base;

  1796. 

  1797.     av_log(s->avctx, AV_LOG_DEBUG, "DTS-XBR: decoding XBR extension\n");

  1798. 

  1799.     /* get bit position of sync header */

  1800.     hdr_pos = get_bits_count(&s->gb) - 32;

  1801. 

  1802.     hdr_size = get_bits(&s->gb, 6) + 1;

  1803.     num_chsets = get_bits(&s->gb, 2) + 1;

  1804. 

  1805.     for(i = 0; i < num_chsets; i++)

  1806.         chset_fsize[i] = get_bits(&s->gb, 14) + 1;

  1807. 

  1808.     xbr_tmode = get_bits1(&s->gb);

  1809. 

  1810.     for(i = 0; i < num_chsets; i++) {

  1811.         n_xbr_ch[i] = get_bits(&s->gb, 3) + 1;

  1812.         k = get_bits(&s->gb, 2) + 5;

  1813.         for(j = 0; j < n_xbr_ch[i]; j++)

  1814.             active_bands[i][j] = get_bits(&s->gb, k) + 1;

  1815.     }

  1816. 

  1817.     /* skip to the end of the header */

  1818.     i = get_bits_count(&s->gb);

  1819.     if(hdr_pos + hdr_size * 8 > i)

  1820.         skip_bits_long(&s->gb, hdr_pos + hdr_size * 8 - i);

  1821. 

  1822.     /* loop over the channel data sets */

  1823.     /* only decode as many channels as we've decoded base data for */

  1824.     for(chset = 0, chan_base = 0;

  1825.         chset < num_chsets && chan_base + n_xbr_ch[chset] <= s->prim_channels;

  1826.         chan_base += n_xbr_ch[chset++]) {

  1827.         int start_posn = get_bits_count(&s->gb);

  1828.         int subsubframe = 0;

  1829.         int subframe = 0;

  1830. 

  1831.         /* loop over subframes */

  1832.         for (k = 0; k < (s->sample_blocks / 8); k++) {

  1833.             /* parse header if we're on first subsubframe of a block */

  1834.             if(subsubframe == 0) {

  1835.                 /* Parse subframe header */

  1836.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1837.                     anctemp[i] = get_bits(&s->gb, 2) + 2;

  1838.                 }

  1839. 

  1840.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1841.                     get_array(&s->gb, abits_high[i], active_bands[chset][i], anctemp[i]);

  1842.                 }

  1843. 

  1844.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1845.                     anctemp[i] = get_bits(&s->gb, 3);

  1846.                     if(anctemp[i] < 1) {

  1847.                         av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: SYNC ERROR\n");

  1848.                         return AVERROR_INVALIDDATA;

  1849.                     }

  1850.                 }

  1851. 

  1852.                 /* generate scale factors */

  1853.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1854.                     const uint32_t *scale_table;

  1855.                     int nbits;

  1856. 

  1857.                     if (s->scalefactor_huffman[chan_base+i] == 6) {

  1858.                         scale_table = scale_factor_quant7;

  1859.                     } else {

  1860.                         scale_table = scale_factor_quant6;

  1861.                     }

  1862. 

  1863.                     nbits = anctemp[i];

  1864. 

  1865.                     for(j = 0; j < active_bands[chset][i]; j++) {

  1866.                         if(abits_high[i][j] > 0) {

  1867.                             scale_table_high[i][j][0] =

  1868.                                 scale_table[get_bits(&s->gb, nbits)];

  1869. 

  1870.                             if(xbr_tmode && s->transition_mode[i][j]) {

  1871.                                 scale_table_high[i][j][1] =

  1872.                                     scale_table[get_bits(&s->gb, nbits)];

  1873.                             }

  1874.                         }

  1875.                     }

  1876.                 }

  1877.             }

  1878. 

  1879.             /* decode audio array for this block */

  1880.             for(i = 0; i < n_xbr_ch[chset]; i++) {

  1881.                 for(j = 0; j < active_bands[chset][i]; j++) {

  1882.                     const int xbr_abits = abits_high[i][j];

  1883.                     const float quant_step_size = lossless_quant_d[xbr_abits];

  1884.                     const int sfi = xbr_tmode && s->transition_mode[i][j] && subsubframe >= s->transition_mode[i][j];

  1885.                     const float rscale = quant_step_size * scale_table_high[i][j][sfi];

  1886.                     float *subband_samples = s->subband_samples[k][chan_base+i][j];

  1887.                     int block[8];

  1888. 

  1889.                     if(xbr_abits <= 0)

  1890.                         continue;

  1891. 

  1892.                     if(xbr_abits > 7) {

  1893.                         get_array(&s->gb, block, 8, xbr_abits - 3);

  1894.                     } else {

  1895.                         int block_code1, block_code2, size, levels, err;

  1896. 

  1897.                         size   = abits_sizes[xbr_abits - 1];

  1898.                         levels = abits_levels[xbr_abits - 1];

  1899. 

  1900.                         block_code1 = get_bits(&s->gb, size);

  1901.                         block_code2 = get_bits(&s->gb, size);

  1902.                         err = decode_blockcodes(block_code1, block_code2,

  1903.                                                 levels, block);

  1904.                         if (err) {

  1905.                             av_log(s->avctx, AV_LOG_ERROR,

  1906.                                    "ERROR: DTS-XBR: block code look-up failed\n");

  1907.                             return AVERROR_INVALIDDATA;

  1908.                         }

  1909.                     }

  1910. 

  1911.                     /* scale & sum into subband */

  1912.                     for(l = 0; l < 8; l++)

  1913.                         subband_samples[l] += (float)block[l] * rscale;

  1914.                 }

  1915.             }

  1916. 

  1917.             /* check DSYNC marker */

  1918.             if(s->aspf || subsubframe == s->subsubframes[subframe] - 1) {

  1919.                 if(get_bits(&s->gb, 16) != 0xffff) {

  1920.                     av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: Didn't get subframe DSYNC\n");

  1921.                     return AVERROR_INVALIDDATA;

  1922.                 }

  1923.             }

  1924. 

  1925.             /* advance sub-sub-frame index */

  1926.             if(++subsubframe >= s->subsubframes[subframe]) {

  1927.                 subsubframe = 0;

  1928.                 subframe++;

  1929.             }

  1930.         }

  1931. 

  1932.         /* skip to next channel set */

  1933.         i = get_bits_count(&s->gb);

  1934.         if(start_posn + chset_fsize[chset] * 8 != i) {

  1935.             j = start_posn + chset_fsize[chset] * 8 - i;

  1936.             if(j < 0 || j >= 8)

  1937.                 av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: end of channel set,"

  1938.                        " skipping further than expected (%d bits)\n", j);

  1939.             skip_bits_long(&s->gb, j);

  1940.         }

  1941.     }

  1942. 

  1943.     return 0;

  1944. }

  1945. 

  1946. /* parse initial header for XXCH and dump details */

  1947. static int dca_xxch_decode_frame(DCAContext *s)

  1948. {

  1949.     int hdr_size, spkmsk_bits, num_chsets, core_spk, hdr_pos;

  1950.     int i, chset, base_channel, chstart, fsize[8];

  1951. 

  1952.     /* assume header word has already been parsed */

  1953.     hdr_pos     = get_bits_count(&s->gb) - 32;

  1954.     hdr_size    = get_bits(&s->gb, 6) + 1;

  1955.   /*chhdr_crc   =*/ skip_bits1(&s->gb);

  1956.     spkmsk_bits = get_bits(&s->gb, 5) + 1;

  1957.     num_chsets  = get_bits(&s->gb, 2) + 1;

  1958. 

  1959.     for (i = 0; i < num_chsets; i++)

  1960.         fsize[i] = get_bits(&s->gb, 14) + 1;

  1961. 

  1962.     core_spk               = get_bits(&s->gb, spkmsk_bits);

  1963.     s->xxch_core_spkmask   = core_spk;

  1964.     s->xxch_nbits_spk_mask = spkmsk_bits;

  1965.     s->xxch_dmix_embedded  = 0;

  1966. 

  1967.     /* skip to the end of the header */

  1968.     i = get_bits_count(&s->gb);

  1969.     if (hdr_pos + hdr_size * 8 > i)

  1970.         skip_bits_long(&s->gb, hdr_pos + hdr_size * 8 - i);

  1971. 

  1972.     for (chset = 0; chset < num_chsets; chset++) {

  1973.         chstart       = get_bits_count(&s->gb);

  1974.         base_channel  = s->prim_channels;

  1975.         s->xxch_chset = chset;

  1976. 

  1977.         /* XXCH and Core headers differ, see 6.4.2 "XXCH Channel Set Header" vs.

  1978.            5.3.2 "Primary Audio Coding Header", DTS Spec 1.3.1 */

  1979.         dca_parse_audio_coding_header(s, base_channel, 1);

  1980. 

  1981.         /* decode channel data */

  1982.         for (i = 0; i < (s->sample_blocks / 8); i++) {

  1983.             if (dca_decode_block(s, base_channel, i)) {

  1984.                 av_log(s->avctx, AV_LOG_ERROR,

  1985.                        "Error decoding DTS-XXCH extension\n");

  1986.                 continue;

  1987.             }

  1988.         }

  1989. 

  1990.         /* skip to end of this section */

  1991.         i = get_bits_count(&s->gb);

  1992.         if (chstart + fsize[chset] * 8 > i)

  1993.             skip_bits_long(&s->gb, chstart + fsize[chset] * 8 - i);

  1994.     }

  1995.     s->xxch_chset = num_chsets;

  1996. 

  1997.     return 0;

  1998. }

  1999. 

  2000. /**

  2001.  * Parse extension substream header (HD)

  2002.  */

  2003. static void dca_exss_parse_header(DCAContext *s)

  2004. {

  2005.     int asset_size[8];

  2006.     int ss_index;

  2007.     int blownup;

  2008.     int num_audiop = 1;

  2009.     int num_assets = 1;

  2010.     int active_ss_mask[8];

  2011.     int i, j;

  2012.     int start_posn;

  2013.     int hdrsize;

  2014.     uint32_t mkr;

  2015. 

  2016.     if (get_bits_left(&s->gb) < 52)

  2017.         return;

  2018. 

  2019.     start_posn = get_bits_count(&s->gb) - 32;

  2020. 

  2021.     skip_bits(&s->gb, 8); // user data

  2022.     ss_index = get_bits(&s->gb, 2);

  2023. 

  2024.     blownup = get_bits1(&s->gb);

  2025.     hdrsize = get_bits(&s->gb,  8 + 4 * blownup) + 1; // header_size

  2026.     skip_bits(&s->gb, 16 + 4 * blownup); // hd_size

  2027. 

  2028.     s->static_fields = get_bits1(&s->gb);

  2029.     if (s->static_fields) {

  2030.         skip_bits(&s->gb, 2); // reference clock code

  2031.         skip_bits(&s->gb, 3); // frame duration code

  2032. 

  2033.         if (get_bits1(&s->gb))

  2034.             skip_bits_long(&s->gb, 36); // timestamp

  2035. 

  2036.         /* a single stream can contain multiple audio assets that can be

  2037.          * combined to form multiple audio presentations */

  2038. 

  2039.         num_audiop = get_bits(&s->gb, 3) + 1;

  2040.         if (num_audiop > 1) {

  2041.             avpriv_request_sample(s->avctx,

  2042.                                   "Multiple DTS-HD audio presentations");

  2043.             /* ignore such streams for now */

  2044.             return;

  2045.         }

  2046. 

  2047.         num_assets = get_bits(&s->gb, 3) + 1;

  2048.         if (num_assets > 1) {

  2049.             avpriv_request_sample(s->avctx, "Multiple DTS-HD audio assets");

  2050.             /* ignore such streams for now */

  2051.             return;

  2052.         }

  2053. 

  2054.         for (i = 0; i < num_audiop; i++)

  2055.             active_ss_mask[i] = get_bits(&s->gb, ss_index + 1);

  2056. 

  2057.         for (i = 0; i < num_audiop; i++)

  2058.             for (j = 0; j <= ss_index; j++)

  2059.                 if (active_ss_mask[i] & (1 << j))

  2060.                     skip_bits(&s->gb, 8); // active asset mask

  2061. 

  2062.         s->mix_metadata = get_bits1(&s->gb);

  2063.         if (s->mix_metadata) {

  2064.             int mix_out_mask_size;

  2065. 

  2066.             skip_bits(&s->gb, 2); // adjustment level

  2067.             mix_out_mask_size  = (get_bits(&s->gb, 2) + 1) << 2;

  2068.             s->num_mix_configs =  get_bits(&s->gb, 2) + 1;

  2069. 

  2070.             for (i = 0; i < s->num_mix_configs; i++) {

  2071.                 int mix_out_mask        = get_bits(&s->gb, mix_out_mask_size);

  2072.                 s->mix_config_num_ch[i] = dca_exss_mask2count(mix_out_mask);

  2073.             }

  2074.         }

  2075.     }

  2076. 

  2077.     av_assert0(num_assets > 0); // silence a warning

  2078. 

  2079.     for (i = 0; i < num_assets; i++)

  2080.         asset_size[i] = get_bits_long(&s->gb, 16 + 4 * blownup);

  2081. 

  2082.     for (i = 0; i < num_assets; i++) {

  2083.         if (dca_exss_parse_asset_header(s))

  2084.             return;

  2085.     }

  2086. 

  2087.     /* not parsed further, we were only interested in the extensions mask

  2088.      * from the asset header */

  2089. 

  2090.         j = get_bits_count(&s->gb);

  2091.         if (start_posn + hdrsize * 8 > j)

  2092.             skip_bits_long(&s->gb, start_posn + hdrsize * 8 - j);

  2093. 

  2094.         for (i = 0; i < num_assets; i++) {

  2095.             start_posn = get_bits_count(&s->gb);

  2096.             mkr        = get_bits_long(&s->gb, 32);

  2097. 

  2098.             /* parse extensions that we know about */

  2099.             if (mkr == 0x655e315e) {

  2100.                 dca_xbr_parse_frame(s);

  2101.             } else if (mkr == 0x47004a03) {

  2102.                 dca_xxch_decode_frame(s);

  2103.                 s->core_ext_mask |= DCA_EXT_XXCH; /* xxx use for chan reordering */

  2104.             } else {

  2105.                 av_log(s->avctx, AV_LOG_DEBUG,

  2106.                        "DTS-ExSS: unknown marker = 0x%08x\n", mkr);

  2107.             }

  2108. 

  2109.             /* skip to end of block */

  2110.             j = get_bits_count(&s->gb);

  2111.             if (start_posn + asset_size[i] * 8 > j)

  2112.                 skip_bits_long(&s->gb, start_posn + asset_size[i] * 8 - j);

  2113.         }

  2114. }

  2115. 

  2116. static float dca_dmix_code(unsigned code)

  2117. {

  2118.     int sign = (code >> 8) - 1;

  2119.     code &= 0xff;

  2120. <<<<<<< HEAD

  2121. #define POW2_MINUS15 .000030517578125

  2122.     return ((dca_dmixtable[code] ^ sign) - sign) * POW2_MINUS15;

  2123. ||||||| merged common ancestors

  2124.     return ldexpf((dca_dmixtable[code] ^ sign) - sign, -15);

  2125. =======

  2126.     return ((dca_dmixtable[code] ^ sign) - sign) * (1.0 / (1U << 15));

  2127. >>>>>>> f2ce63246f5c934429f9cb857a794e07624d7912

  2128. }

  2129. 

  2130. /**

  2131.  * Main frame decoding function

  2132.  * FIXME add arguments

  2133.  */

  2134. static int dca_decode_frame(AVCodecContext *avctx, void *data,

  2135.                             int *got_frame_ptr, AVPacket *avpkt)

  2136. {

  2137.     AVFrame *frame     = data;

  2138.     const uint8_t *buf = avpkt->data;

  2139.     int buf_size = avpkt->size;

  2140.     int channel_mask;

  2141.     int channel_layout;

  2142.     int lfe_samples;

  2143.     int num_core_channels = 0;

  2144.     int i, ret;

  2145.     float **samples_flt;

  2146.     float *src_chan;

  2147.     float *dst_chan;

  2148.     DCAContext *s = avctx->priv_data;

  2149.     int core_ss_end;

  2150.     int channels, full_channels;

  2151.     float scale;

  2152.     int achan;

  2153.     int chset;

  2154.     int mask;

  2155.     int lavc;

  2156.     int posn;

  2157.     int j, k;

  2158.     int endch;

  2159. 

  2160.     s->xch_present = 0;

  2161. 

  2162.     s->dca_buffer_size = ff_dca_convert_bitstream(buf, buf_size, s->dca_buffer,

  2163.                                                   DCA_MAX_FRAME_SIZE + DCA_MAX_EXSS_HEADER_SIZE);

  2164.     if (s->dca_buffer_size == AVERROR_INVALIDDATA) {

  2165.         av_log(avctx, AV_LOG_ERROR, "Not a valid DCA frame\n");

  2166.         return AVERROR_INVALIDDATA;

  2167.     }

  2168. 

  2169.     if ((ret = dca_parse_frame_header(s)) < 0) {

  2170.         //seems like the frame is corrupt, try with the next one

  2171.         return ret;

  2172.     }

  2173.     //set AVCodec values with parsed data

  2174.     avctx->sample_rate = s->sample_rate;

  2175.     avctx->bit_rate    = s->bit_rate;

  2176. 

  2177.     s->profile = FF_PROFILE_DTS;

  2178. 

  2179.     for (i = 0; i < (s->sample_blocks / 8); i++) {

  2180.         if ((ret = dca_decode_block(s, 0, i))) {

  2181.             av_log(avctx, AV_LOG_ERROR, "error decoding block\n");

  2182.             return ret;

  2183.         }

  2184.     }

  2185. 

  2186.     /* record number of core channels incase less than max channels are requested */

  2187.     num_core_channels = s->prim_channels;

  2188. 

  2189.     if (s->prim_channels + !!s->lfe > 2 &&

  2190.         avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {

  2191.             /* Stereo downmix coefficients

  2192.              *

  2193.              * The decoder can only downmix to 2-channel, so we need to ensure

  2194.              * embedded downmix coefficients are actually targeting 2-channel.

  2195.              */

  2196.             if (s->core_downmix && (s->core_downmix_amode == DCA_STEREO ||

  2197.                                     s->core_downmix_amode == DCA_STEREO_TOTAL)) {

  2198.                 for (i = 0; i < num_core_channels + !!s->lfe; i++) {

  2199.                     /* Range checked earlier */

  2200.                     s->downmix_coef[i][0] = dca_dmix_code(s->core_downmix_codes[i][0]);

  2201.                     s->downmix_coef[i][1] = dca_dmix_code(s->core_downmix_codes[i][1]);

  2202.                 }

  2203.                 s->output = s->core_downmix_amode;

  2204.             } else {

  2205.                 int am = s->amode & DCA_CHANNEL_MASK;

  2206.                 if (am >= FF_ARRAY_ELEMS(dca_default_coeffs)) {

  2207.                     av_log(s->avctx, AV_LOG_ERROR,

  2208.                            "Invalid channel mode %d\n", am);

  2209.                     return AVERROR_INVALIDDATA;

  2210.                 }

  2211.                 if (num_core_channels + !!s->lfe >

  2212.                     FF_ARRAY_ELEMS(dca_default_coeffs[0])) {

  2213.                     avpriv_request_sample(s->avctx, "Downmixing %d channels",

  2214.                                           s->prim_channels + !!s->lfe);

  2215.                     return AVERROR_PATCHWELCOME;

  2216.                 }

  2217.                 for (i = 0; i < num_core_channels + !!s->lfe; i++) {

  2218.                     s->downmix_coef[i][0] = dca_default_coeffs[am][i][0];

  2219.                     s->downmix_coef[i][1] = dca_default_coeffs[am][i][1];

  2220.                 }

  2221.             }

  2222.             av_dlog(s->avctx, "Stereo downmix coeffs:\n");

  2223.             for (i = 0; i < num_core_channels + !!s->lfe; i++) {

  2224.                 av_dlog(s->avctx, "L, input channel %d = %f\n", i,

  2225.                         s->downmix_coef[i][0]);

  2226.                 av_dlog(s->avctx, "R, input channel %d = %f\n", i,

  2227.                         s->downmix_coef[i][1]);

  2228.             }

  2229.             av_dlog(s->avctx, "\n");

  2230.     }

  2231. 

  2232.     if (s->ext_coding)

  2233.         s->core_ext_mask = dca_ext_audio_descr_mask[s->ext_descr];

  2234.     else

  2235.         s->core_ext_mask = 0;

  2236. 

  2237.     core_ss_end = FFMIN(s->frame_size, s->dca_buffer_size) * 8;

  2238. 

  2239.     /* only scan for extensions if ext_descr was unknown or indicated a

  2240.      * supported XCh extension */

  2241.     if (s->core_ext_mask < 0 || s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH)) {

  2242. 

  2243.         /* if ext_descr was unknown, clear s->core_ext_mask so that the

  2244.          * extensions scan can fill it up */

  2245.         s->core_ext_mask = FFMAX(s->core_ext_mask, 0);

  2246. 

  2247.         /* extensions start at 32-bit boundaries into bitstream */

  2248.         skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);

  2249. 

  2250.         while (core_ss_end - get_bits_count(&s->gb) >= 32) {

  2251.             uint32_t bits = get_bits_long(&s->gb, 32);

  2252. 

  2253.             switch (bits) {

  2254.             case 0x5a5a5a5a: {

  2255.                 int ext_amode, xch_fsize;

  2256. 

  2257.                 s->xch_base_channel = s->prim_channels;

  2258. 

  2259.                 /* validate sync word using XCHFSIZE field */

  2260.                 xch_fsize = show_bits(&s->gb, 10);

  2261.                 if ((s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize) &&

  2262.                     (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize + 1))

  2263.                     continue;

  2264. 

  2265.                 /* skip length-to-end-of-frame field for the moment */

  2266.                 skip_bits(&s->gb, 10);

  2267. 

  2268.                 s->core_ext_mask |= DCA_EXT_XCH;

  2269. 

  2270.                 /* extension amode(number of channels in extension) should be 1 */

  2271.                 /* AFAIK XCh is not used for more channels */

  2272.                 if ((ext_amode = get_bits(&s->gb, 4)) != 1) {

  2273.                     av_log(avctx, AV_LOG_ERROR, "XCh extension amode %d not"

  2274.                            " supported!\n", ext_amode);

  2275.                     continue;

  2276.                 }

  2277. 

  2278.                 if (s->xch_base_channel < 2) {

  2279.                     avpriv_request_sample(avctx, "XCh with fewer than 2 base channels");

  2280.                     continue;

  2281.                 }

  2282. 

  2283.                 /* much like core primary audio coding header */

  2284.                 dca_parse_audio_coding_header(s, s->xch_base_channel, 0);

  2285. 

  2286.                 for (i = 0; i < (s->sample_blocks / 8); i++)

  2287.                     if ((ret = dca_decode_block(s, s->xch_base_channel, i))) {

  2288.                         av_log(avctx, AV_LOG_ERROR, "error decoding XCh extension\n");

  2289.                         continue;

  2290.                     }

  2291. 

  2292.                 s->xch_present = 1;

  2293.                 break;

  2294.             }

  2295.             case 0x47004a03:

  2296.                 /* XXCh: extended channels */

  2297.                 /* usually found either in core or HD part in DTS-HD HRA streams,

  2298.                  * but not in DTS-ES which contains XCh extensions instead */

  2299.                 s->core_ext_mask |= DCA_EXT_XXCH;

  2300.                 dca_xxch_decode_frame(s);

  2301.                 break;

  2302. 

  2303.             case 0x1d95f262: {

  2304.                 int fsize96 = show_bits(&s->gb, 12) + 1;

  2305.                 if (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + fsize96)

  2306.                     continue;

  2307. 

  2308.                 av_log(avctx, AV_LOG_DEBUG, "X96 extension found at %d bits\n",

  2309.                        get_bits_count(&s->gb));

  2310.                 skip_bits(&s->gb, 12);

  2311.                 av_log(avctx, AV_LOG_DEBUG, "FSIZE96 = %d bytes\n", fsize96);

  2312.                 av_log(avctx, AV_LOG_DEBUG, "REVNO = %d\n", get_bits(&s->gb, 4));

  2313. 

  2314.                 s->core_ext_mask |= DCA_EXT_X96;

  2315.                 break;

  2316.             }

  2317.             }

  2318. 

  2319.             skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);

  2320.         }

  2321.     } else {

  2322.         /* no supported extensions, skip the rest of the core substream */

  2323.         skip_bits_long(&s->gb, core_ss_end - get_bits_count(&s->gb));

  2324.     }

  2325. 

  2326.     if (s->core_ext_mask & DCA_EXT_X96)

  2327.         s->profile = FF_PROFILE_DTS_96_24;

  2328.     else if (s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH))

  2329.         s->profile = FF_PROFILE_DTS_ES;

  2330. 

  2331.     /* check for ExSS (HD part) */

  2332.     if (s->dca_buffer_size - s->frame_size > 32 &&

  2333.         get_bits_long(&s->gb, 32) == DCA_HD_MARKER)

  2334.         dca_exss_parse_header(s);

  2335. 

  2336.     avctx->profile = s->profile;

  2337. 

  2338.     full_channels = channels = s->prim_channels + !!s->lfe;

  2339. 

  2340.     /* If we have XXCH then the channel layout is managed differently */

  2341.     /* note that XLL will also have another way to do things */

  2342.     if (!(s->core_ext_mask & DCA_EXT_XXCH)

  2343.         || (s->core_ext_mask & DCA_EXT_XXCH && avctx->request_channels > 0

  2344.             && avctx->request_channels

  2345.             < num_core_channels + !!s->lfe + s->xxch_chset_nch[0]))

  2346.     { /* xxx should also do MA extensions */

  2347.         if (s->amode < 16) {

  2348.             avctx->channel_layout = dca_core_channel_layout[s->amode];

  2349. 

  2350.             if (s->prim_channels + !!s->lfe > 2 &&

  2351.                 avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {

  2352.                 /*

  2353.                  * Neither the core's auxiliary data nor our default tables contain

  2354.                  * downmix coefficients for the additional channel coded in the XCh

  2355.                  * extension, so when we're doing a Stereo downmix, don't decode it.

  2356.                  */

  2357.                 s->xch_disable = 1;

  2358.             }

  2359. 

  2360. #if FF_API_REQUEST_CHANNELS

  2361. FF_DISABLE_DEPRECATION_WARNINGS

  2362.             if (s->xch_present && !s->xch_disable &&

  2363.                 (!avctx->request_channels ||

  2364.                  avctx->request_channels > num_core_channels + !!s->lfe)) {

  2365. FF_ENABLE_DEPRECATION_WARNINGS

  2366. #else

  2367.             if (s->xch_present && !s->xch_disable) {

  2368. #endif

  2369.                 avctx->channel_layout |= AV_CH_BACK_CENTER;

  2370.                 if (s->lfe) {

  2371.                     avctx->channel_layout |= AV_CH_LOW_FREQUENCY;

  2372.                     s->channel_order_tab = dca_channel_reorder_lfe_xch[s->amode];

  2373.                 } else {

  2374.                     s->channel_order_tab = dca_channel_reorder_nolfe_xch[s->amode];

  2375.                 }

  2376.                 if (s->channel_order_tab[s->xch_base_channel] < 0)

  2377.                     return AVERROR_INVALIDDATA;

  2378.             } else {

  2379.                 channels = num_core_channels + !!s->lfe;

  2380.                 s->xch_present = 0; /* disable further xch processing */

  2381.                 if (s->lfe) {

  2382.                     avctx->channel_layout |= AV_CH_LOW_FREQUENCY;

  2383.                     s->channel_order_tab = dca_channel_reorder_lfe[s->amode];

  2384.                 } else

  2385.                     s->channel_order_tab = dca_channel_reorder_nolfe[s->amode];

  2386.             }

  2387. 

  2388.             if (channels > !!s->lfe &&

  2389.                 s->channel_order_tab[channels - 1 - !!s->lfe] < 0)

  2390.                 return AVERROR_INVALIDDATA;

  2391. 

  2392.             if (av_get_channel_layout_nb_channels(avctx->channel_layout) != channels) {

  2393.                 av_log(avctx, AV_LOG_ERROR, "Number of channels %d mismatches layout %d\n", channels, av_get_channel_layout_nb_channels(avctx->channel_layout));

  2394.                 return AVERROR_INVALIDDATA;

  2395.             }

  2396. 

  2397.             if (num_core_channels + !!s->lfe > 2 &&

  2398.                 avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {

  2399.                 channels = 2;

  2400.                 s->output = s->prim_channels == 2 ? s->amode : DCA_STEREO;

  2401.                 avctx->channel_layout = AV_CH_LAYOUT_STEREO;

  2402.             }

  2403.             else if (avctx->request_channel_layout & AV_CH_LAYOUT_NATIVE) {

  2404.                 static const int8_t dca_channel_order_native[9] = { 0, 1, 2, 3, 4, 5, 6, 7, 8 };

  2405.                 s->channel_order_tab = dca_channel_order_native;

  2406.             }

  2407.             s->lfe_index = dca_lfe_index[s->amode];

  2408.         } else {

  2409.             av_log(avctx, AV_LOG_ERROR,

  2410.                    "Non standard configuration %d !\n", s->amode);

  2411.             return AVERROR_INVALIDDATA;

  2412.         }

  2413. 

  2414.         s->xxch_dmix_embedded = 0;

  2415.     } else {

  2416.         /* we only get here if an XXCH channel set can be added to the mix */

  2417.         channel_mask = s->xxch_core_spkmask;

  2418. 

  2419.         if (avctx->request_channels > 0

  2420.             && avctx->request_channels < s->prim_channels) {

  2421.             channels = num_core_channels + !!s->lfe;

  2422.             for (i = 0; i < s->xxch_chset && channels + s->xxch_chset_nch[i]

  2423.                                               <= avctx->request_channels; i++) {

  2424.                 channels += s->xxch_chset_nch[i];

  2425.                 channel_mask |= s->xxch_spk_masks[i];

  2426.             }

  2427.         } else {

  2428.             channels = s->prim_channels + !!s->lfe;

  2429.             for (i = 0; i < s->xxch_chset; i++) {

  2430.                 channel_mask |= s->xxch_spk_masks[i];

  2431.             }

  2432.         }

  2433. 

  2434.         /* Given the DTS spec'ed channel mask, generate an avcodec version */

  2435.         channel_layout = 0;

  2436.         for (i = 0; i < s->xxch_nbits_spk_mask; ++i) {

  2437.             if (channel_mask & (1 << i)) {

  2438.                 channel_layout |= map_xxch_to_native[i];

  2439.             }

  2440.         }

  2441. 

  2442.         /* make sure that we have managed to get equivalent dts/avcodec channel

  2443.          * masks in some sense -- unfortunately some channels could overlap */

  2444.         if (av_popcount(channel_mask) != av_popcount(channel_layout)) {

  2445.             av_log(avctx, AV_LOG_DEBUG,

  2446.                    "DTS-XXCH: Inconsistent avcodec/dts channel layouts\n");

  2447.             return AVERROR_INVALIDDATA;

  2448.         }

  2449. 

  2450.         avctx->channel_layout = channel_layout;

  2451. 

  2452.         if (!(avctx->request_channel_layout & AV_CH_LAYOUT_NATIVE)) {

  2453.             /* Estimate DTS --> avcodec ordering table */

  2454.             for (chset = -1, j = 0; chset < s->xxch_chset; ++chset) {

  2455.                 mask = chset >= 0 ? s->xxch_spk_masks[chset]

  2456.                                   : s->xxch_core_spkmask;

  2457.                 for (i = 0; i < s->xxch_nbits_spk_mask; i++) {

  2458.                     if (mask & ~(DCA_XXCH_LFE1 | DCA_XXCH_LFE2) & (1 << i)) {

  2459.                         lavc = map_xxch_to_native[i];

  2460.                         posn = av_popcount(channel_layout & (lavc - 1));

  2461.                         s->xxch_order_tab[j++] = posn;

  2462.                     }

  2463.                 }

  2464. 

  2465.             }

  2466. 

  2467.             s->lfe_index = av_popcount(channel_layout & (AV_CH_LOW_FREQUENCY-1));

  2468.         } else { /* native ordering */

  2469.             for (i = 0; i < channels; i++)

  2470.                 s->xxch_order_tab[i] = i;

  2471. 

  2472.             s->lfe_index = channels - 1;

  2473.         }

  2474. 

  2475.         s->channel_order_tab = s->xxch_order_tab;

  2476.     }

  2477. 

  2478.     if (avctx->channels != channels) {

  2479.         if (avctx->channels)

  2480.             av_log(avctx, AV_LOG_INFO, "Number of channels changed in DCA decoder (%d -> %d)\n", avctx->channels, channels);

  2481.         avctx->channels = channels;

  2482.     }

  2483. 

  2484.     /* get output buffer */

  2485.     frame->nb_samples = 256 * (s->sample_blocks / 8);

  2486.     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)

  2487.         return ret;

  2488.     samples_flt = (float **)frame->extended_data;

  2489. 

  2490.     /* allocate buffer for extra channels if downmixing */

  2491.     if (avctx->channels < full_channels) {

  2492.         ret = av_samples_get_buffer_size(NULL, full_channels - channels,

  2493.                                          frame->nb_samples,

  2494.                                          avctx->sample_fmt, 0);

  2495.         if (ret < 0)

  2496.             return ret;

  2497. 

  2498.         av_fast_malloc(&s->extra_channels_buffer,

  2499.                        &s->extra_channels_buffer_size, ret);

  2500.         if (!s->extra_channels_buffer)

  2501.             return AVERROR(ENOMEM);

  2502. 

  2503.         ret = av_samples_fill_arrays((uint8_t **)s->extra_channels, NULL,

  2504.                                      s->extra_channels_buffer,

  2505.                                      full_channels - channels,

  2506.                                      frame->nb_samples, avctx->sample_fmt, 0);

  2507.         if (ret < 0)

  2508.             return ret;

  2509.     }

  2510. 

  2511.     /* filter to get final output */

  2512.     for (i = 0; i < (s->sample_blocks / 8); i++) {

  2513.         int ch;

  2514. 

  2515.         for (ch = 0; ch < channels; ch++)

  2516.             s->samples_chanptr[ch] = samples_flt[ch] + i * 256;

  2517.         for (; ch < full_channels; ch++)

  2518.             s->samples_chanptr[ch] = s->extra_channels[ch - channels] + i * 256;

  2519. 

  2520.         dca_filter_channels(s, i);

  2521. 

  2522.         /* If this was marked as a DTS-ES stream we need to subtract back- */

  2523.         /* channel from SL & SR to remove matrixed back-channel signal */

  2524.         if ((s->source_pcm_res & 1) && s->xch_present) {

  2525.             float *back_chan = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel]];

  2526.             float *lt_chan   = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel - 2]];

  2527.             float *rt_chan   = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel - 1]];

  2528.             s->fdsp.vector_fmac_scalar(lt_chan, back_chan, -M_SQRT1_2, 256);

  2529.             s->fdsp.vector_fmac_scalar(rt_chan, back_chan, -M_SQRT1_2, 256);

  2530.         }

  2531. 

  2532.         /* If stream contains XXCH, we might need to undo an embedded downmix */

  2533.         if (s->xxch_dmix_embedded) {

  2534.             /* Loop over channel sets in turn */

  2535.             ch = num_core_channels;

  2536.             for (chset = 0; chset < s->xxch_chset; chset++) {

  2537.                 endch = ch + s->xxch_chset_nch[chset];

  2538.                 mask = s->xxch_dmix_embedded;

  2539. 

  2540.                 /* undo downmix */

  2541.                 for (j = ch; j < endch; j++) {

  2542.                     if (mask & (1 << j)) { /* this channel has been mixed-out */

  2543.                         src_chan = s->samples_chanptr[s->channel_order_tab[j]];

  2544.                         for (k = 0; k < endch; k++) {

  2545.                             achan = s->channel_order_tab[k];

  2546.                             scale = s->xxch_dmix_coeff[j][k];

  2547.                             if (scale != 0.0) {

  2548.                                 dst_chan = s->samples_chanptr[achan];

  2549.                                 s->fdsp.vector_fmac_scalar(dst_chan, src_chan,

  2550.                                                            -scale, 256);

  2551.                             }

  2552.                         }

  2553.                     }

  2554.                 }

  2555. 

  2556.                 /* if a downmix has been embedded then undo the pre-scaling */

  2557.                 if ((mask & (1 << ch)) && s->xxch_dmix_sf[chset] != 1.0f) {

  2558.                     scale = s->xxch_dmix_sf[chset];

  2559. 

  2560.                     for (j = 0; j < ch; j++) {

  2561.                         src_chan = s->samples_chanptr[s->channel_order_tab[j]];

  2562.                         for (k = 0; k < 256; k++)

  2563.                             src_chan[k] *= scale;

  2564.                     }

  2565. 

  2566.                     /* LFE channel is always part of core, scale if it exists */

  2567.                     if (s->lfe) {

  2568.                         src_chan = s->samples_chanptr[s->lfe_index];

  2569.                         for (k = 0; k < 256; k++)

  2570.                             src_chan[k] *= scale;

  2571.                     }

  2572.                 }

  2573. 

  2574.                 ch = endch;

  2575.             }

  2576. 

  2577.         }

  2578.     }

  2579. 

  2580.     /* update lfe history */

  2581.     lfe_samples = 2 * s->lfe * (s->sample_blocks / 8);

  2582.     for (i = 0; i < 2 * s->lfe * 4; i++)

  2583.         s->lfe_data[i] = s->lfe_data[i + lfe_samples];

  2584. 

  2585.     /* AVMatrixEncoding

  2586.      *

  2587.      * DCA_STEREO_TOTAL (Lt/Rt) is equivalent to Dolby Surround */

  2588.     ret = ff_side_data_update_matrix_encoding(frame,

  2589.                                               (s->output & ~DCA_LFE) == DCA_STEREO_TOTAL ?

  2590.                                               AV_MATRIX_ENCODING_DOLBY : AV_MATRIX_ENCODING_NONE);

  2591.     if (ret < 0)

  2592.         return ret;

  2593. 

  2594.     *got_frame_ptr = 1;

  2595. 

  2596.     return buf_size;

  2597. }

  2598. 

  2599. 

  2600. 

  2601. /**

  2602.  * DCA initialization

  2603.  *

  2604.  * @param avctx     pointer to the AVCodecContext

  2605.  */

  2606. 

  2607. static av_cold int dca_decode_init(AVCodecContext *avctx)

  2608. {

  2609.     DCAContext *s = avctx->priv_data;

  2610. 

  2611.     s->avctx = avctx;

  2612.     dca_init_vlcs();

  2613. 

  2614.     avpriv_float_dsp_init(&s->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);

  2615.     ff_mdct_init(&s->imdct, 6, 1, 1.0);

  2616.     ff_synth_filter_init(&s->synth);

  2617.     ff_dcadsp_init(&s->dcadsp);

  2618.     ff_fmt_convert_init(&s->fmt_conv, avctx);

  2619. 

  2620.     avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;

  2621. 

  2622.     /* allow downmixing to stereo */

  2623. #if FF_API_REQUEST_CHANNELS

  2624. FF_DISABLE_DEPRECATION_WARNINGS

  2625.     if (avctx->request_channels == 2)

  2626.         avctx->request_channel_layout = AV_CH_LAYOUT_STEREO;

  2627. FF_ENABLE_DEPRECATION_WARNINGS

  2628. #endif

  2629.     if (avctx->channels > 2 &&

  2630.         avctx->request_channel_layout == AV_CH_LAYOUT_STEREO)

  2631.         avctx->channels = 2;

  2632. 

  2633.     return 0;

  2634. }

  2635. 

  2636. static av_cold int dca_decode_end(AVCodecContext *avctx)

  2637. {

  2638.     DCAContext *s = avctx->priv_data;

  2639.     ff_mdct_end(&s->imdct);

  2640.     av_freep(&s->extra_channels_buffer);

  2641.     return 0;

  2642. }

  2643. 

  2644. static const AVProfile profiles[] = {

  2645.     { FF_PROFILE_DTS,        "DTS"        },

  2646.     { FF_PROFILE_DTS_ES,     "DTS-ES"     },

  2647.     { FF_PROFILE_DTS_96_24,  "DTS 96/24"  },

  2648.     { FF_PROFILE_DTS_HD_HRA, "DTS-HD HRA" },

  2649.     { FF_PROFILE_DTS_HD_MA,  "DTS-HD MA"  },

  2650.     { FF_PROFILE_UNKNOWN },

  2651. };

  2652. 

  2653. static const AVOption options[] = {

  2654.     { "disable_xch", "disable decoding of the XCh extension", offsetof(DCAContext, xch_disable), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM|AV_OPT_FLAG_AUDIO_PARAM },

  2655.     { NULL },

  2656. };

  2657. 

  2658. static const AVClass dca_decoder_class = {

  2659.     .class_name = "DCA decoder",

  2660.     .item_name  = av_default_item_name,

  2661.     .option     = options,

  2662.     .version    = LIBAVUTIL_VERSION_INT,

  2663.     .category   = AV_CLASS_CATEGORY_DECODER,

  2664. };

  2665. 

  2666. AVCodec ff_dca_decoder = {

  2667.     .name            = "dca",

  2668.     .long_name       = NULL_IF_CONFIG_SMALL("DCA (DTS Coherent Acoustics)"),

  2669.     .type            = AVMEDIA_TYPE_AUDIO,

  2670.     .id              = AV_CODEC_ID_DTS,

  2671.     .priv_data_size  = sizeof(DCAContext),

  2672.     .init            = dca_decode_init,

  2673.     .decode          = dca_decode_frame,

  2674.     .close           = dca_decode_end,

  2675.     .capabilities    = CODEC_CAP_CHANNEL_CONF | CODEC_CAP_DR1,

  2676.     .sample_fmts     = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,

  2677.                                                        AV_SAMPLE_FMT_NONE },

  2678.     .profiles        = NULL_IF_CONFIG_SMALL(profiles),

  2679.     .priv_class      = &dca_decoder_class,

  2680. };