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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 const uint16_t dca_vlc_offs[] = {

  482.         0,   512,   640,   768,  1282,  1794,  2436,  3080,  3770,  4454,  5364,

  483.      5372,  5380,  5388,  5392,  5396,  5412,  5420,  5428,  5460,  5492,  5508,

  484.      5572,  5604,  5668,  5796,  5860,  5892,  6412,  6668,  6796,  7308,  7564,

  485.      7820,  8076,  8620,  9132,  9388,  9910, 10166, 10680, 11196, 11726, 12240,

  486.     12752, 13298, 13810, 14326, 14840, 15500, 16022, 16540, 17158, 17678, 18264,

  487.     18796, 19352, 19926, 20468, 21472, 22398, 23014, 23622,

  488. };

  489. 

  490. static av_cold void dca_init_vlcs(void)

  491. {

  492.     static int vlcs_initialized = 0;

  493.     int i, j, c = 14;

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

  495. 

  496.     if (vlcs_initialized)

  497.         return;

  498. 

  499.     dca_bitalloc_index.offset = 1;

  500.     dca_bitalloc_index.wrap = 2;

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

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

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

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

  505.                  bitalloc_12_bits[i], 1, 1,

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

  507.     }

  508.     dca_scalefactor.offset = -64;

  509.     dca_scalefactor.wrap = 2;

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

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

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

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

  514.                  scales_bits[i], 1, 1,

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

  516.     }

  517.     dca_tmode.offset = 0;

  518.     dca_tmode.wrap = 1;

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

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

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

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

  523.                  tmode_bits[i], 1, 1,

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

  525.     }

  526. 

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

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

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

  530.                 break;

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

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

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

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

  535. 

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

  537.                      bitalloc_sizes[i],

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

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

  540.             c++;

  541.         }

  542.     vlcs_initialized = 1;

  543. }

  544. 

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

  546. {

  547.     while (len--)

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

  549. }

  550. 

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

  552. {

  553.     int i, base, mask;

  554. 

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

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

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

  558.         base += av_popcount(mask);

  559. 

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

  561. }

  562. 

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

  564.                                          int xxch)

  565. {

  566.     int i, j;

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

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

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

  570.     int hdr_pos = 0, hdr_size = 0;

  571.     float sign, mag, scale_factor;

  572.     int this_chans, acc_mask;

  573.     int embedded_downmix;

  574.     int nchans, mask[8];

  575.     int coeff, ichan;

  576. 

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

  578.     if (xxch) {

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

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

  581.     }

  582. 

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

  584.     s->total_channels = nchans + base_channel;

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

  586. 

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

  588.     if (xxch) {

  589.         acc_mask = s->xxch_core_spkmask;

  590. 

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

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

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

  594. 

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

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

  597. 

  598.         /* check for downmixing information */

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

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

  601.             scale_factor     =

  602.                1.0f / dca_dmixtable[(get_bits(&s->gb, 6) - 1) << 2];

  603. 

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

  605. 

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

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

  608.             }

  609. 

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

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

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

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

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

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

  616.                             av_log(s->avctx, AV_LOG_WARNING,

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

  618.                             continue;

  619.                         }

  620. 

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

  622.                         sign  = (coeff & 64) ? 1.0 : -1.0;

  623.                         mag   = dca_dmixtable[((coeff & 63) - 1) << 2];

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

  625.                         s->xxch_dmix_coeff[j][ichan] = sign * mag;

  626.                     }

  627.                 }

  628.             }

  629.         }

  630.     }

  631. 

  632.     if (s->prim_channels > DCA_PRIM_CHANNELS_MAX)

  633.         s->prim_channels = DCA_PRIM_CHANNELS_MAX;

  634. 

  635. 

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

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

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

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

  640.     }

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

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

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

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

  645.     }

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

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

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

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

  650. 

  651.     /* Get codebooks quantization indexes */

  652.     if (!base_channel)

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

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

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

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

  657. 

  658.     /* Get scale factor adjustment */

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

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

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

  662. 

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

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

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

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

  667. 

  668.     if (!xxch) {

  669.         if (s->crc_present) {

  670.             /* Audio header CRC check */

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

  672.         }

  673.     } else {

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

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

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

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

  678.     }

  679. 

  680.     s->current_subframe    = 0;

  681.     s->current_subsubframe = 0;

  682. 

  683. #ifdef TRACE

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

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

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

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

  688.                s->subband_activity[i]);

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

  690.                s->vq_start_subband[i]);

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

  692.                s->joint_intensity[i]);

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

  694.                s->transient_huffman[i]);

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

  696.                s->scalefactor_huffman[i]);

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

  698.                s->bitalloc_huffman[i]);

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

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

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

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

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

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

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

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

  707.     }

  708. #endif

  709. 

  710.     return 0;

  711. }

  712. 

  713. static int dca_parse_frame_header(DCAContext *s)

  714. {

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

  716. 

  717.     /* Sync code */

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

  719. 

  720.     /* Frame header */

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

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

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

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

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

  726.     if (s->frame_size < 95)

  727.         return AVERROR_INVALIDDATA;

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

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

  730.     if (!s->sample_rate)

  731.         return AVERROR_INVALIDDATA;

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

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

  734.     if (!s->bit_rate)

  735.         return AVERROR_INVALIDDATA;

  736. 

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

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

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

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

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

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

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

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

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

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

  747. 

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

  749.         s->lfe = 0;

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

  751.         return AVERROR_INVALIDDATA;

  752.     }

  753. 

  754.     /* TODO: check CRC */

  755.     if (s->crc_present)

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

  757. 

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

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

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

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

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

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

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

  765. 

  766.     /* FIXME: channels mixing levels */

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

  768.     if (s->lfe)

  769.         s->output |= DCA_LFE;

  770. 

  771. #ifdef TRACE

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

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

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

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

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

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

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

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

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

  781.            s->sample_rate);

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

  783.            s->bit_rate);

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

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

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

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

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

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

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

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

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

  793.            s->predictor_history);

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

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

  796.            s->multirate_inter);

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

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

  799.     av_log(s->avctx, AV_LOG_DEBUG,

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

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

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

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

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

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

  806. #endif

  807. 

  808.     /* Primary audio coding header */

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

  810. 

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

  812. }

  813. 

  814. 

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

  816. {

  817.     if (level < 5) {

  818.         /* huffman encoded */

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

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

  821.     } else if (level < 8) {

  822.         if (level + 1 > log2range) {

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

  824.             value = get_bits(gb, log2range);

  825.         } else {

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

  827.         }

  828.     }

  829.     return value;

  830. }

  831. 

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

  833. {

  834.     /* Primary audio coding side information */

  835.     int j, k;

  836. 

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

  838.         return AVERROR_INVALIDDATA;

  839. 

  840.     if (!base_channel) {

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

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

  843.     }

  844. 

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

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

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

  848.     }

  849. 

  850.     /* Get prediction codebook */

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

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

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

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

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

  856.             }

  857.         }

  858.     }

  859. 

  860.     /* Bit allocation index */

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

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

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

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

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

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

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

  868.                 av_log(s->avctx, AV_LOG_ERROR,

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

  870.                 return AVERROR_INVALIDDATA;

  871.             } else {

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

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

  874.             }

  875. 

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

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

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

  879.                 return AVERROR_INVALIDDATA;

  880.             }

  881.         }

  882.     }

  883. 

  884.     /* Transition mode */

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

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

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

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

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

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

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

  892.             }

  893.         }

  894.     }

  895. 

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

  897.         return AVERROR_INVALIDDATA;

  898. 

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

  900.         const uint32_t *scale_table;

  901.         int scale_sum, log_size;

  902. 

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

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

  905. 

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

  907.             scale_table = scale_factor_quant7;

  908.             log_size = 7;

  909.         } else {

  910.             scale_table = scale_factor_quant6;

  911.             log_size = 6;

  912.         }

  913. 

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

  915.         scale_sum = 0;

  916. 

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

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

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

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

  921.             }

  922. 

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

  924.                 /* Get second scale factor */

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

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

  927.             }

  928.         }

  929.     }

  930. 

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

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

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

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

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

  936.     }

  937. 

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

  939.         return AVERROR_INVALIDDATA;

  940. 

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

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

  943.         int source_channel;

  944. 

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

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

  947.             int scale = 0;

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

  949. 

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

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

  952. 

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

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

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

  956.             }

  957. 

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

  959.                 av_log(s->avctx, AV_LOG_DEBUG,

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

  961.                 s->debug_flag |= 0x02;

  962.             }

  963.         }

  964.     }

  965. 

  966.     /* Dynamic range coefficient */

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

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

  969. 

  970.     /* Side information CRC check word */

  971.     if (s->crc_present) {

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

  973.     }

  974. 

  975.     /*

  976.      * Primary audio data arrays

  977.      */

  978. 

  979.     /* VQ encoded high frequency subbands */

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

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

  982.             /* 1 vector -> 32 samples */

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

  984. 

  985.     /* Low frequency effect data */

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

  987.         int quant7;

  988.         /* LFE samples */

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

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

  991.         float lfe_scale;

  992. 

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

  994.             /* Signed 8 bits int */

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

  996.         }

  997. 

  998.         /* Scale factor index */

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

  1000.         if (quant7 > 127) {

  1001.             avpriv_request_sample(s->avctx, "LFEScaleIndex larger than 127");

  1002.             return AVERROR_INVALIDDATA;

  1003.         }

  1004.         s->lfe_scale_factor = scale_factor_quant7[quant7];

  1005. 

  1006.         /* Quantization step size * scale factor */

  1007.         lfe_scale = 0.035 * s->lfe_scale_factor;

  1008. 

  1009.         for (j = lfe_samples; j < lfe_end_sample; j++)

  1010.             s->lfe_data[j] *= lfe_scale;

  1011.     }

  1012. 

  1013. #ifdef TRACE

  1014.     av_log(s->avctx, AV_LOG_DEBUG, "subsubframes: %i\n",

  1015.            s->subsubframes[s->current_subframe]);

  1016.     av_log(s->avctx, AV_LOG_DEBUG, "partial samples: %i\n",

  1017.            s->partial_samples[s->current_subframe]);

  1018. 

  1019.     for (j = base_channel; j < s->prim_channels; j++) {

  1020.         av_log(s->avctx, AV_LOG_DEBUG, "prediction mode:");

  1021.         for (k = 0; k < s->subband_activity[j]; k++)

  1022.             av_log(s->avctx, AV_LOG_DEBUG, " %i", s->prediction_mode[j][k]);

  1023.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1024.     }

  1025.     for (j = base_channel; j < s->prim_channels; j++) {

  1026.         for (k = 0; k < s->subband_activity[j]; k++)

  1027.             av_log(s->avctx, AV_LOG_DEBUG,

  1028.                    "prediction coefs: %f, %f, %f, %f\n",

  1029.                    (float) adpcm_vb[s->prediction_vq[j][k]][0] / 8192,

  1030.                    (float) adpcm_vb[s->prediction_vq[j][k]][1] / 8192,

  1031.                    (float) adpcm_vb[s->prediction_vq[j][k]][2] / 8192,

  1032.                    (float) adpcm_vb[s->prediction_vq[j][k]][3] / 8192);

  1033.     }

  1034.     for (j = base_channel; j < s->prim_channels; j++) {

  1035.         av_log(s->avctx, AV_LOG_DEBUG, "bitalloc index: ");

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

  1037.             av_log(s->avctx, AV_LOG_DEBUG, "%2.2i ", s->bitalloc[j][k]);

  1038.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1039.     }

  1040.     for (j = base_channel; j < s->prim_channels; j++) {

  1041.         av_log(s->avctx, AV_LOG_DEBUG, "Transition mode:");

  1042.         for (k = 0; k < s->subband_activity[j]; k++)

  1043.             av_log(s->avctx, AV_LOG_DEBUG, " %i", s->transition_mode[j][k]);

  1044.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1045.     }

  1046.     for (j = base_channel; j < s->prim_channels; j++) {

  1047.         av_log(s->avctx, AV_LOG_DEBUG, "Scale factor:");

  1048.         for (k = 0; k < s->subband_activity[j]; k++) {

  1049.             if (k >= s->vq_start_subband[j] || s->bitalloc[j][k] > 0)

  1050.                 av_log(s->avctx, AV_LOG_DEBUG, " %i", s->scale_factor[j][k][0]);

  1051.             if (k < s->vq_start_subband[j] && s->transition_mode[j][k])

  1052.                 av_log(s->avctx, AV_LOG_DEBUG, " %i(t)", s->scale_factor[j][k][1]);

  1053.         }

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

  1055.     }

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

  1057.         if (s->joint_intensity[j] > 0) {

  1058.             int source_channel = s->joint_intensity[j] - 1;

  1059.             av_log(s->avctx, AV_LOG_DEBUG, "Joint scale factor index:\n");

  1060.             for (k = s->subband_activity[j]; k < s->subband_activity[source_channel]; k++)

  1061.                 av_log(s->avctx, AV_LOG_DEBUG, " %i", s->joint_scale_factor[j][k]);

  1062.             av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1063.         }

  1064.     }

  1065.     for (j = base_channel; j < s->prim_channels; j++)

  1066.         for (k = s->vq_start_subband[j]; k < s->subband_activity[j]; k++)

  1067.             av_log(s->avctx, AV_LOG_DEBUG, "VQ index: %i\n", s->high_freq_vq[j][k]);

  1068.     if (!base_channel && s->lfe) {

  1069.         int lfe_samples = 2 * s->lfe * (4 + block_index);

  1070.         int lfe_end_sample = 2 * s->lfe * (4 + block_index + s->subsubframes[s->current_subframe]);

  1071. 

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

  1073.         for (j = lfe_samples; j < lfe_end_sample; j++)

  1074.             av_log(s->avctx, AV_LOG_DEBUG, " %f", s->lfe_data[j]);

  1075.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1076.     }

  1077. #endif

  1078. 

  1079.     return 0;

  1080. }

  1081. 

  1082. static void qmf_32_subbands(DCAContext *s, int chans,

  1083.                             float samples_in[32][8], float *samples_out,

  1084.                             float scale)

  1085. {

  1086.     const float *prCoeff;

  1087. 

  1088.     int sb_act = s->subband_activity[chans];

  1089. 

  1090.     scale *= sqrt(1 / 8.0);

  1091. 

  1092.     /* Select filter */

  1093.     if (!s->multirate_inter)    /* Non-perfect reconstruction */

  1094.         prCoeff = fir_32bands_nonperfect;

  1095.     else                        /* Perfect reconstruction */

  1096.         prCoeff = fir_32bands_perfect;

  1097. 

  1098.     s->dcadsp.qmf_32_subbands(samples_in, sb_act, &s->synth, &s->imdct,

  1099.                               s->subband_fir_hist[chans],

  1100.                               &s->hist_index[chans],

  1101.                               s->subband_fir_noidea[chans], prCoeff,

  1102.                               samples_out, s->raXin, scale);

  1103. }

  1104. 

  1105. static void lfe_interpolation_fir(DCAContext *s, int decimation_select,

  1106.                                   int num_deci_sample, float *samples_in,

  1107.                                   float *samples_out)

  1108. {

  1109.     /* samples_in: An array holding decimated samples.

  1110.      *   Samples in current subframe starts from samples_in[0],

  1111.      *   while samples_in[-1], samples_in[-2], ..., stores samples

  1112.      *   from last subframe as history.

  1113.      *

  1114.      * samples_out: An array holding interpolated samples

  1115.      */

  1116. 

  1117.     int idx;

  1118.     const float *prCoeff;

  1119.     int deciindex;

  1120. 

  1121.     /* Select decimation filter */

  1122.     if (decimation_select == 1) {

  1123.         idx = 1;

  1124.         prCoeff = lfe_fir_128;

  1125.     } else {

  1126.         idx = 0;

  1127.         prCoeff = lfe_fir_64;

  1128.     }

  1129.     /* Interpolation */

  1130.     for (deciindex = 0; deciindex < num_deci_sample; deciindex++) {

  1131.         s->dcadsp.lfe_fir[idx](samples_out, samples_in, prCoeff);

  1132.         samples_in++;

  1133.         samples_out += 2 * 32 * (1 + idx);

  1134.     }

  1135. }

  1136. 

  1137. /* downmixing routines */

  1138. #define MIX_REAR1(samples, s1, rs, coef)            \

  1139.     samples[0][i] += samples[s1][i] * coef[rs][0];  \

  1140.     samples[1][i] += samples[s1][i] * coef[rs][1];

  1141. 

  1142. #define MIX_REAR2(samples, s1, s2, rs, coef)                                          \

  1143.     samples[0][i] += samples[s1][i] * coef[rs][0] + samples[s2][i] * coef[rs + 1][0]; \

  1144.     samples[1][i] += samples[s1][i] * coef[rs][1] + samples[s2][i] * coef[rs + 1][1];

  1145. 

  1146. #define MIX_FRONT3(samples, coef)                                      \

  1147.     t = samples[c][i];                                                 \

  1148.     u = samples[l][i];                                                 \

  1149.     v = samples[r][i];                                                 \

  1150.     samples[0][i] = t * coef[0][0] + u * coef[1][0] + v * coef[2][0];  \

  1151.     samples[1][i] = t * coef[0][1] + u * coef[1][1] + v * coef[2][1];

  1152. 

  1153. #define DOWNMIX_TO_STEREO(op1, op2)             \

  1154.     for (i = 0; i < 256; i++) {                 \

  1155.         op1                                     \

  1156.         op2                                     \

  1157.     }

  1158. 

  1159. static void dca_downmix(float **samples, int srcfmt, int lfe_present,

  1160.                         float coef[DCA_PRIM_CHANNELS_MAX + 1][2],

  1161.                         const int8_t *channel_mapping)

  1162. {

  1163.     int c, l, r, sl, sr, s;

  1164.     int i;

  1165.     float t, u, v;

  1166. 

  1167.     switch (srcfmt) {

  1168.     case DCA_MONO:

  1169.     case DCA_4F2R:

  1170.         av_log(NULL, AV_LOG_ERROR, "Not implemented!\n");

  1171.         break;

  1172.     case DCA_CHANNEL:

  1173.     case DCA_STEREO:

  1174.     case DCA_STEREO_TOTAL:

  1175.     case DCA_STEREO_SUMDIFF:

  1176.         break;

  1177.     case DCA_3F:

  1178.         c = channel_mapping[0];

  1179.         l = channel_mapping[1];

  1180.         r = channel_mapping[2];

  1181.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef), );

  1182.         break;

  1183.     case DCA_2F1R:

  1184.         s = channel_mapping[2];

  1185.         DOWNMIX_TO_STEREO(MIX_REAR1(samples, s, 2, coef), );

  1186.         break;

  1187.     case DCA_3F1R:

  1188.         c = channel_mapping[0];

  1189.         l = channel_mapping[1];

  1190.         r = channel_mapping[2];

  1191.         s = channel_mapping[3];

  1192.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),

  1193.                           MIX_REAR1(samples, s, 3, coef));

  1194.         break;

  1195.     case DCA_2F2R:

  1196.         sl = channel_mapping[2];

  1197.         sr = channel_mapping[3];

  1198.         DOWNMIX_TO_STEREO(MIX_REAR2(samples, sl, sr, 2, coef), );

  1199.         break;

  1200.     case DCA_3F2R:

  1201.         c  = channel_mapping[0];

  1202.         l  = channel_mapping[1];

  1203.         r  = channel_mapping[2];

  1204.         sl = channel_mapping[3];

  1205.         sr = channel_mapping[4];

  1206.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),

  1207.                           MIX_REAR2(samples, sl, sr, 3, coef));

  1208.         break;

  1209.     }

  1210.     if (lfe_present) {

  1211.         int lf_buf = dca_lfe_index[srcfmt];

  1212.         int lf_idx = dca_channels [srcfmt];

  1213.         for (i = 0; i < 256; i++) {

  1214.             samples[0][i] += samples[lf_buf][i] * coef[lf_idx][0];

  1215.             samples[1][i] += samples[lf_buf][i] * coef[lf_idx][1];

  1216.         }

  1217.     }

  1218. }

  1219. 

  1220. 

  1221. #ifndef decode_blockcodes

  1222. /* Very compact version of the block code decoder that does not use table

  1223.  * look-up but is slightly slower */

  1224. static int decode_blockcode(int code, int levels, int32_t *values)

  1225. {

  1226.     int i;

  1227.     int offset = (levels - 1) >> 1;

  1228. 

  1229.     for (i = 0; i < 4; i++) {

  1230.         int div = FASTDIV(code, levels);

  1231.         values[i] = code - offset - div * levels;

  1232.         code = div;

  1233.     }

  1234. 

  1235.     return code;

  1236. }

  1237. 

  1238. static int decode_blockcodes(int code1, int code2, int levels, int32_t *values)

  1239. {

  1240.     return decode_blockcode(code1, levels, values) |

  1241.            decode_blockcode(code2, levels, values + 4);

  1242. }

  1243. #endif

  1244. 

  1245. static const uint8_t abits_sizes[7]  = { 7, 10, 12, 13, 15, 17, 19 };

  1246. static const uint8_t abits_levels[7] = { 3,  5,  7,  9, 13, 17, 25 };

  1247. 

  1248. static int dca_subsubframe(DCAContext *s, int base_channel, int block_index)

  1249. {

  1250.     int k, l;

  1251.     int subsubframe = s->current_subsubframe;

  1252. 

  1253.     const float *quant_step_table;

  1254. 

  1255.     /* FIXME */

  1256.     float (*subband_samples)[DCA_SUBBANDS][8] = s->subband_samples[block_index];

  1257.     LOCAL_ALIGNED_16(int32_t, block, [8 * DCA_SUBBANDS]);

  1258. 

  1259.     /*

  1260.      * Audio data

  1261.      */

  1262. 

  1263.     /* Select quantization step size table */

  1264.     if (s->bit_rate_index == 0x1f)

  1265.         quant_step_table = lossless_quant_d;

  1266.     else

  1267.         quant_step_table = lossy_quant_d;

  1268. 

  1269.     for (k = base_channel; k < s->prim_channels; k++) {

  1270.         float rscale[DCA_SUBBANDS];

  1271. 

  1272.         if (get_bits_left(&s->gb) < 0)

  1273.             return AVERROR_INVALIDDATA;

  1274. 

  1275.         for (l = 0; l < s->vq_start_subband[k]; l++) {

  1276.             int m;

  1277. 

  1278.             /* Select the mid-tread linear quantizer */

  1279.             int abits = s->bitalloc[k][l];

  1280. 

  1281.             float quant_step_size = quant_step_table[abits];

  1282. 

  1283.             /*

  1284.              * Determine quantization index code book and its type

  1285.              */

  1286. 

  1287.             /* Select quantization index code book */

  1288.             int sel = s->quant_index_huffman[k][abits];

  1289. 

  1290.             /*

  1291.              * Extract bits from the bit stream

  1292.              */

  1293.             if (!abits) {

  1294.                 rscale[l] = 0;

  1295.                 memset(block + 8 * l, 0, 8 * sizeof(block[0]));

  1296.             } else {

  1297.                 /* Deal with transients */

  1298.                 int sfi = s->transition_mode[k][l] && subsubframe >= s->transition_mode[k][l];

  1299.                 rscale[l] = quant_step_size * s->scale_factor[k][l][sfi] *

  1300.                                s->scalefactor_adj[k][sel];

  1301. 

  1302.                 if (abits >= 11 || !dca_smpl_bitalloc[abits].vlc[sel].table) {

  1303.                     if (abits <= 7) {

  1304.                         /* Block code */

  1305.                         int block_code1, block_code2, size, levels, err;

  1306. 

  1307.                         size   = abits_sizes[abits - 1];

  1308.                         levels = abits_levels[abits - 1];

  1309. 

  1310.                         block_code1 = get_bits(&s->gb, size);

  1311.                         block_code2 = get_bits(&s->gb, size);

  1312.                         err = decode_blockcodes(block_code1, block_code2,

  1313.                                                 levels, block + 8 * l);

  1314.                         if (err) {

  1315.                             av_log(s->avctx, AV_LOG_ERROR,

  1316.                                    "ERROR: block code look-up failed\n");

  1317.                             return AVERROR_INVALIDDATA;

  1318.                         }

  1319.                     } else {

  1320.                         /* no coding */

  1321.                         for (m = 0; m < 8; m++)

  1322.                             block[8 * l + m] = get_sbits(&s->gb, abits - 3);

  1323.                     }

  1324.                 } else {

  1325.                     /* Huffman coded */

  1326.                     for (m = 0; m < 8; m++)

  1327.                         block[8 * l + m] = get_bitalloc(&s->gb,

  1328.                                                 &dca_smpl_bitalloc[abits], sel);

  1329.                 }

  1330. 

  1331.             }

  1332.         }

  1333. 

  1334.         s->fmt_conv.int32_to_float_fmul_array8(&s->fmt_conv, subband_samples[k][0],

  1335.                                                block, rscale, 8 * s->vq_start_subband[k]);

  1336. 

  1337.         for (l = 0; l < s->vq_start_subband[k]; l++) {

  1338.             int m;

  1339.             /*

  1340.              * Inverse ADPCM if in prediction mode

  1341.              */

  1342.             if (s->prediction_mode[k][l]) {

  1343.                 int n;

  1344.                 if (s->predictor_history)

  1345.                     subband_samples[k][l][0] += (adpcm_vb[s->prediction_vq[k][l]][0] *

  1346.                                                  s->subband_samples_hist[k][l][3] +

  1347.                                                  adpcm_vb[s->prediction_vq[k][l]][1] *

  1348.                                                  s->subband_samples_hist[k][l][2] +

  1349.                                                  adpcm_vb[s->prediction_vq[k][l]][2] *

  1350.                                                  s->subband_samples_hist[k][l][1] +

  1351.                                                  adpcm_vb[s->prediction_vq[k][l]][3] *

  1352.                                                  s->subband_samples_hist[k][l][0]) *

  1353.                                                 (1.0f / 8192);

  1354.                 for (m = 1; m < 8; m++) {

  1355.                     float sum = adpcm_vb[s->prediction_vq[k][l]][0] *

  1356.                                 subband_samples[k][l][m - 1];

  1357.                     for (n = 2; n <= 4; n++)

  1358.                         if (m >= n)

  1359.                             sum += adpcm_vb[s->prediction_vq[k][l]][n - 1] *

  1360.                                    subband_samples[k][l][m - n];

  1361.                         else if (s->predictor_history)

  1362.                             sum += adpcm_vb[s->prediction_vq[k][l]][n - 1] *

  1363.                                    s->subband_samples_hist[k][l][m - n + 4];

  1364.                     subband_samples[k][l][m] += sum * (1.0f / 8192);

  1365.                 }

  1366.             }

  1367.         }

  1368. 

  1369.         /*

  1370.          * Decode VQ encoded high frequencies

  1371.          */

  1372.         if (s->subband_activity[k] > s->vq_start_subband[k]) {

  1373.             if (!(s->debug_flag & 0x01)) {

  1374.                 av_log(s->avctx, AV_LOG_DEBUG,

  1375.                        "Stream with high frequencies VQ coding\n");

  1376.                 s->debug_flag |= 0x01;

  1377.             }

  1378.             s->dcadsp.decode_hf(subband_samples[k], s->high_freq_vq[k],

  1379.                                 high_freq_vq, subsubframe * 8,

  1380.                                 s->scale_factor[k], s->vq_start_subband[k],

  1381.                                 s->subband_activity[k]);

  1382.         }

  1383.     }

  1384. 

  1385.     /* Check for DSYNC after subsubframe */

  1386.     if (s->aspf || subsubframe == s->subsubframes[s->current_subframe] - 1) {

  1387.         if (0xFFFF == get_bits(&s->gb, 16)) {   /* 0xFFFF */

  1388. #ifdef TRACE

  1389.             av_log(s->avctx, AV_LOG_DEBUG, "Got subframe DSYNC\n");

  1390. #endif

  1391.         } else {

  1392.             av_log(s->avctx, AV_LOG_ERROR, "Didn't get subframe DSYNC\n");

  1393.             return AVERROR_INVALIDDATA;

  1394.         }

  1395.     }

  1396. 

  1397.     /* Backup predictor history for adpcm */

  1398.     for (k = base_channel; k < s->prim_channels; k++)

  1399.         for (l = 0; l < s->vq_start_subband[k]; l++)

  1400.             AV_COPY128(s->subband_samples_hist[k][l], &subband_samples[k][l][4]);

  1401. 

  1402.     return 0;

  1403. }

  1404. 

  1405. static int dca_filter_channels(DCAContext *s, int block_index)

  1406. {

  1407.     float (*subband_samples)[DCA_SUBBANDS][8] = s->subband_samples[block_index];

  1408.     int k;

  1409. 

  1410.     /* 32 subbands QMF */

  1411.     for (k = 0; k < s->prim_channels; k++) {

  1412. /*        static float pcm_to_double[8] = { 32768.0, 32768.0, 524288.0, 524288.0,

  1413.                                             0, 8388608.0, 8388608.0 };*/

  1414.         if (s->channel_order_tab[k] >= 0)

  1415.             qmf_32_subbands(s, k, subband_samples[k],

  1416.                             s->samples_chanptr[s->channel_order_tab[k]],

  1417.                             M_SQRT1_2 / 32768.0 /* pcm_to_double[s->source_pcm_res] */);

  1418.     }

  1419. 

  1420.     /* Generate LFE samples for this subsubframe FIXME!!! */

  1421.     if (s->lfe) {

  1422.         lfe_interpolation_fir(s, s->lfe, 2 * s->lfe,

  1423.                               s->lfe_data + 2 * s->lfe * (block_index + 4),

  1424.                               s->samples_chanptr[s->lfe_index]);

  1425.         /* Outputs 20bits pcm samples */

  1426.     }

  1427. 

  1428.     /* Downmixing to Stereo */

  1429.     if (s->prim_channels + !!s->lfe > 2 &&

  1430.         s->avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {

  1431.         dca_downmix(s->samples_chanptr, s->amode, !!s->lfe, s->downmix_coef,

  1432.                     s->channel_order_tab);

  1433.     }

  1434. 

  1435.     return 0;

  1436. }

  1437. 

  1438. 

  1439. static int dca_subframe_footer(DCAContext *s, int base_channel)

  1440. {

  1441.     int in, out, aux_data_count, aux_data_end, reserved;

  1442.     uint32_t nsyncaux;

  1443. 

  1444.     /*

  1445.      * Unpack optional information

  1446.      */

  1447. 

  1448.     /* presumably optional information only appears in the core? */

  1449.     if (!base_channel) {

  1450.         if (s->timestamp)

  1451.             skip_bits_long(&s->gb, 32);

  1452. 

  1453.         if (s->aux_data) {

  1454.             aux_data_count = get_bits(&s->gb, 6);

  1455. 

  1456.             // align (32-bit)

  1457.             skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);

  1458. 

  1459.             aux_data_end = 8 * aux_data_count + get_bits_count(&s->gb);

  1460. 

  1461.             if ((nsyncaux = get_bits_long(&s->gb, 32)) != DCA_NSYNCAUX) {

  1462.                 av_log(s->avctx, AV_LOG_ERROR, "nSYNCAUX mismatch %#"PRIx32"\n",

  1463.                        nsyncaux);

  1464.                 return AVERROR_INVALIDDATA;

  1465.             }

  1466. 

  1467.             if (get_bits1(&s->gb)) { // bAUXTimeStampFlag

  1468.                 avpriv_request_sample(s->avctx,

  1469.                                       "Auxiliary Decode Time Stamp Flag");

  1470.                 // align (4-bit)

  1471.                 skip_bits(&s->gb, (-get_bits_count(&s->gb)) & 4);

  1472.                 // 44 bits: nMSByte (8), nMarker (4), nLSByte (28), nMarker (4)

  1473.                 skip_bits_long(&s->gb, 44);

  1474.             }

  1475. 

  1476.             if ((s->core_downmix = get_bits1(&s->gb))) {

  1477.                 int am = get_bits(&s->gb, 3);

  1478.                 switch (am) {

  1479.                 case 0:

  1480.                     s->core_downmix_amode = DCA_MONO;

  1481.                     break;

  1482.                 case 1:

  1483.                     s->core_downmix_amode = DCA_STEREO;

  1484.                     break;

  1485.                 case 2:

  1486.                     s->core_downmix_amode = DCA_STEREO_TOTAL;

  1487.                     break;

  1488.                 case 3:

  1489.                     s->core_downmix_amode = DCA_3F;

  1490.                     break;

  1491.                 case 4:

  1492.                     s->core_downmix_amode = DCA_2F1R;

  1493.                     break;

  1494.                 case 5:

  1495.                     s->core_downmix_amode = DCA_2F2R;

  1496.                     break;

  1497.                 case 6:

  1498.                     s->core_downmix_amode = DCA_3F1R;

  1499.                     break;

  1500.                 default:

  1501.                     av_log(s->avctx, AV_LOG_ERROR,

  1502.                            "Invalid mode %d for embedded downmix coefficients\n",

  1503.                            am);

  1504.                     return AVERROR_INVALIDDATA;

  1505.                 }

  1506.                 for (out = 0; out < dca_channels[s->core_downmix_amode]; out++) {

  1507.                     for (in = 0; in < s->prim_channels + !!s->lfe; in++) {

  1508.                         uint16_t tmp = get_bits(&s->gb, 9);

  1509.                         if ((tmp & 0xFF) > 241) {

  1510.                             av_log(s->avctx, AV_LOG_ERROR,

  1511.                                    "Invalid downmix coefficient code %"PRIu16"\n",

  1512.                                    tmp);

  1513.                             return AVERROR_INVALIDDATA;

  1514.                         }

  1515.                         s->core_downmix_codes[in][out] = tmp;

  1516.                     }

  1517.                 }

  1518.             }

  1519. 

  1520.             align_get_bits(&s->gb); // byte align

  1521.             skip_bits(&s->gb, 16);  // nAUXCRC16

  1522. 

  1523.             // additional data (reserved, cf. ETSI TS 102 114 V1.4.1)

  1524.             if ((reserved = (aux_data_end - get_bits_count(&s->gb))) < 0) {

  1525.                  av_log(s->avctx, AV_LOG_ERROR,

  1526.                         "Overread auxiliary data by %d bits\n", -reserved);

  1527.                 return AVERROR_INVALIDDATA;

  1528.             } else if (reserved) {

  1529.                 avpriv_request_sample(s->avctx,

  1530.                                       "Core auxiliary data reserved content");

  1531.                 skip_bits_long(&s->gb, reserved);

  1532.             }

  1533.         }

  1534. 

  1535.         if (s->crc_present && s->dynrange)

  1536.             get_bits(&s->gb, 16);

  1537.     }

  1538. 

  1539.     return 0;

  1540. }

  1541. 

  1542. /**

  1543.  * Decode a dca frame block

  1544.  *

  1545.  * @param s     pointer to the DCAContext

  1546.  */

  1547. 

  1548. static int dca_decode_block(DCAContext *s, int base_channel, int block_index)

  1549. {

  1550.     int ret;

  1551. 

  1552.     /* Sanity check */

  1553.     if (s->current_subframe >= s->subframes) {

  1554.         av_log(s->avctx, AV_LOG_DEBUG, "check failed: %i>%i",

  1555.                s->current_subframe, s->subframes);

  1556.         return AVERROR_INVALIDDATA;

  1557.     }

  1558. 

  1559.     if (!s->current_subsubframe) {

  1560. #ifdef TRACE

  1561.         av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subframe_header\n");

  1562. #endif

  1563.         /* Read subframe header */

  1564.         if ((ret = dca_subframe_header(s, base_channel, block_index)))

  1565.             return ret;

  1566.     }

  1567. 

  1568.     /* Read subsubframe */

  1569. #ifdef TRACE

  1570.     av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subsubframe\n");

  1571. #endif

  1572.     if ((ret = dca_subsubframe(s, base_channel, block_index)))

  1573.         return ret;

  1574. 

  1575.     /* Update state */

  1576.     s->current_subsubframe++;

  1577.     if (s->current_subsubframe >= s->subsubframes[s->current_subframe]) {

  1578.         s->current_subsubframe = 0;

  1579.         s->current_subframe++;

  1580.     }

  1581.     if (s->current_subframe >= s->subframes) {

  1582. #ifdef TRACE

  1583.         av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subframe_footer\n");

  1584. #endif

  1585.         /* Read subframe footer */

  1586.         if ((ret = dca_subframe_footer(s, base_channel)))

  1587.             return ret;

  1588.     }

  1589. 

  1590.     return 0;

  1591. }

  1592. 

  1593. /**

  1594.  * Return the number of channels in an ExSS speaker mask (HD)

  1595.  */

  1596. static int dca_exss_mask2count(int mask)

  1597. {

  1598.     /* count bits that mean speaker pairs twice */

  1599.     return av_popcount(mask) +

  1600.            av_popcount(mask & (DCA_EXSS_CENTER_LEFT_RIGHT      |

  1601.                                DCA_EXSS_FRONT_LEFT_RIGHT       |

  1602.                                DCA_EXSS_FRONT_HIGH_LEFT_RIGHT  |

  1603.                                DCA_EXSS_WIDE_LEFT_RIGHT        |

  1604.                                DCA_EXSS_SIDE_LEFT_RIGHT        |

  1605.                                DCA_EXSS_SIDE_HIGH_LEFT_RIGHT   |

  1606.                                DCA_EXSS_SIDE_REAR_LEFT_RIGHT   |

  1607.                                DCA_EXSS_REAR_LEFT_RIGHT        |

  1608.                                DCA_EXSS_REAR_HIGH_LEFT_RIGHT));

  1609. }

  1610. 

  1611. /**

  1612.  * Skip mixing coefficients of a single mix out configuration (HD)

  1613.  */

  1614. static void dca_exss_skip_mix_coeffs(GetBitContext *gb, int channels, int out_ch)

  1615. {

  1616.     int i;

  1617. 

  1618.     for (i = 0; i < channels; i++) {

  1619.         int mix_map_mask = get_bits(gb, out_ch);

  1620.         int num_coeffs = av_popcount(mix_map_mask);

  1621.         skip_bits_long(gb, num_coeffs * 6);

  1622.     }

  1623. }

  1624. 

  1625. /**

  1626.  * Parse extension substream asset header (HD)

  1627.  */

  1628. static int dca_exss_parse_asset_header(DCAContext *s)

  1629. {

  1630.     int header_pos = get_bits_count(&s->gb);

  1631.     int header_size;

  1632.     int channels = 0;

  1633.     int embedded_stereo = 0;

  1634.     int embedded_6ch    = 0;

  1635.     int drc_code_present;

  1636.     int av_uninit(extensions_mask);

  1637.     int i, j;

  1638. 

  1639.     if (get_bits_left(&s->gb) < 16)

  1640.         return -1;

  1641. 

  1642.     /* We will parse just enough to get to the extensions bitmask with which

  1643.      * we can set the profile value. */

  1644. 

  1645.     header_size = get_bits(&s->gb, 9) + 1;

  1646.     skip_bits(&s->gb, 3); // asset index

  1647. 

  1648.     if (s->static_fields) {

  1649.         if (get_bits1(&s->gb))

  1650.             skip_bits(&s->gb, 4); // asset type descriptor

  1651.         if (get_bits1(&s->gb))

  1652.             skip_bits_long(&s->gb, 24); // language descriptor

  1653. 

  1654.         if (get_bits1(&s->gb)) {

  1655.             /* How can one fit 1024 bytes of text here if the maximum value

  1656.              * for the asset header size field above was 512 bytes? */

  1657.             int text_length = get_bits(&s->gb, 10) + 1;

  1658.             if (get_bits_left(&s->gb) < text_length * 8)

  1659.                 return -1;

  1660.             skip_bits_long(&s->gb, text_length * 8); // info text

  1661.         }

  1662. 

  1663.         skip_bits(&s->gb, 5); // bit resolution - 1

  1664.         skip_bits(&s->gb, 4); // max sample rate code

  1665.         channels = get_bits(&s->gb, 8) + 1;

  1666. 

  1667.         if (get_bits1(&s->gb)) { // 1-to-1 channels to speakers

  1668.             int spkr_remap_sets;

  1669.             int spkr_mask_size = 16;

  1670.             int num_spkrs[7];

  1671. 

  1672.             if (channels > 2)

  1673.                 embedded_stereo = get_bits1(&s->gb);

  1674.             if (channels > 6)

  1675.                 embedded_6ch = get_bits1(&s->gb);

  1676. 

  1677.             if (get_bits1(&s->gb)) {

  1678.                 spkr_mask_size = (get_bits(&s->gb, 2) + 1) << 2;

  1679.                 skip_bits(&s->gb, spkr_mask_size); // spkr activity mask

  1680.             }

  1681. 

  1682.             spkr_remap_sets = get_bits(&s->gb, 3);

  1683. 

  1684.             for (i = 0; i < spkr_remap_sets; i++) {

  1685.                 /* std layout mask for each remap set */

  1686.                 num_spkrs[i] = dca_exss_mask2count(get_bits(&s->gb, spkr_mask_size));

  1687.             }

  1688. 

  1689.             for (i = 0; i < spkr_remap_sets; i++) {

  1690.                 int num_dec_ch_remaps = get_bits(&s->gb, 5) + 1;

  1691.                 if (get_bits_left(&s->gb) < 0)

  1692.                     return -1;

  1693. 

  1694.                 for (j = 0; j < num_spkrs[i]; j++) {

  1695.                     int remap_dec_ch_mask = get_bits_long(&s->gb, num_dec_ch_remaps);

  1696.                     int num_dec_ch = av_popcount(remap_dec_ch_mask);

  1697.                     skip_bits_long(&s->gb, num_dec_ch * 5); // remap codes

  1698.                 }

  1699.             }

  1700. 

  1701.         } else {

  1702.             skip_bits(&s->gb, 3); // representation type

  1703.         }

  1704.     }

  1705. 

  1706.     drc_code_present = get_bits1(&s->gb);

  1707.     if (drc_code_present)

  1708.         get_bits(&s->gb, 8); // drc code

  1709. 

  1710.     if (get_bits1(&s->gb))

  1711.         skip_bits(&s->gb, 5); // dialog normalization code

  1712. 

  1713.     if (drc_code_present && embedded_stereo)

  1714.         get_bits(&s->gb, 8); // drc stereo code

  1715. 

  1716.     if (s->mix_metadata && get_bits1(&s->gb)) {

  1717.         skip_bits(&s->gb, 1); // external mix

  1718.         skip_bits(&s->gb, 6); // post mix gain code

  1719. 

  1720.         if (get_bits(&s->gb, 2) != 3) // mixer drc code

  1721.             skip_bits(&s->gb, 3); // drc limit

  1722.         else

  1723.             skip_bits(&s->gb, 8); // custom drc code

  1724. 

  1725.         if (get_bits1(&s->gb)) // channel specific scaling

  1726.             for (i = 0; i < s->num_mix_configs; i++)

  1727.                 skip_bits_long(&s->gb, s->mix_config_num_ch[i] * 6); // scale codes

  1728.         else

  1729.             skip_bits_long(&s->gb, s->num_mix_configs * 6); // scale codes

  1730. 

  1731.         for (i = 0; i < s->num_mix_configs; i++) {

  1732.             if (get_bits_left(&s->gb) < 0)

  1733.                 return -1;

  1734.             dca_exss_skip_mix_coeffs(&s->gb, channels, s->mix_config_num_ch[i]);

  1735.             if (embedded_6ch)

  1736.                 dca_exss_skip_mix_coeffs(&s->gb, 6, s->mix_config_num_ch[i]);

  1737.             if (embedded_stereo)

  1738.                 dca_exss_skip_mix_coeffs(&s->gb, 2, s->mix_config_num_ch[i]);

  1739.         }

  1740.     }

  1741. 

  1742.     switch (get_bits(&s->gb, 2)) {

  1743.     case 0: extensions_mask = get_bits(&s->gb, 12); break;

  1744.     case 1: extensions_mask = DCA_EXT_EXSS_XLL;     break;

  1745.     case 2: extensions_mask = DCA_EXT_EXSS_LBR;     break;

  1746.     case 3: extensions_mask = 0; /* aux coding */   break;

  1747.     }

  1748. 

  1749.     /* not parsed further, we were only interested in the extensions mask */

  1750. 

  1751.     if (get_bits_left(&s->gb) < 0)

  1752.         return -1;

  1753. 

  1754.     if (get_bits_count(&s->gb) - header_pos > header_size * 8) {

  1755.         av_log(s->avctx, AV_LOG_WARNING, "Asset header size mismatch.\n");

  1756.         return -1;

  1757.     }

  1758.     skip_bits_long(&s->gb, header_pos + header_size * 8 - get_bits_count(&s->gb));

  1759. 

  1760.     if (extensions_mask & DCA_EXT_EXSS_XLL)

  1761.         s->profile = FF_PROFILE_DTS_HD_MA;

  1762.     else if (extensions_mask & (DCA_EXT_EXSS_XBR | DCA_EXT_EXSS_X96 |

  1763.                                 DCA_EXT_EXSS_XXCH))

  1764.         s->profile = FF_PROFILE_DTS_HD_HRA;

  1765. 

  1766.     if (!(extensions_mask & DCA_EXT_CORE))

  1767.         av_log(s->avctx, AV_LOG_WARNING, "DTS core detection mismatch.\n");

  1768.     if ((extensions_mask & DCA_CORE_EXTS) != s->core_ext_mask)

  1769.         av_log(s->avctx, AV_LOG_WARNING,

  1770.                "DTS extensions detection mismatch (%d, %d)\n",

  1771.                extensions_mask & DCA_CORE_EXTS, s->core_ext_mask);

  1772. 

  1773.     return 0;

  1774. }

  1775. 

  1776. static int dca_xbr_parse_frame(DCAContext *s)

  1777. {

  1778.     int scale_table_high[DCA_CHSET_CHANS_MAX][DCA_SUBBANDS][2];

  1779.     int active_bands[DCA_CHSETS_MAX][DCA_CHSET_CHANS_MAX];

  1780.     int abits_high[DCA_CHSET_CHANS_MAX][DCA_SUBBANDS];

  1781.     int anctemp[DCA_CHSET_CHANS_MAX];

  1782.     int chset_fsize[DCA_CHSETS_MAX];

  1783.     int n_xbr_ch[DCA_CHSETS_MAX];

  1784.     int hdr_size, num_chsets, xbr_tmode, hdr_pos;

  1785.     int i, j, k, l, chset, chan_base;

  1786. 

  1787.     av_log(s->avctx, AV_LOG_DEBUG, "DTS-XBR: decoding XBR extension\n");

  1788. 

  1789.     /* get bit position of sync header */

  1790.     hdr_pos = get_bits_count(&s->gb) - 32;

  1791. 

  1792.     hdr_size = get_bits(&s->gb, 6) + 1;

  1793.     num_chsets = get_bits(&s->gb, 2) + 1;

  1794. 

  1795.     for(i = 0; i < num_chsets; i++)

  1796.         chset_fsize[i] = get_bits(&s->gb, 14) + 1;

  1797. 

  1798.     xbr_tmode = get_bits1(&s->gb);

  1799. 

  1800.     for(i = 0; i < num_chsets; i++) {

  1801.         n_xbr_ch[i] = get_bits(&s->gb, 3) + 1;

  1802.         k = get_bits(&s->gb, 2) + 5;

  1803.         for(j = 0; j < n_xbr_ch[i]; j++)

  1804.             active_bands[i][j] = get_bits(&s->gb, k) + 1;

  1805.     }

  1806. 

  1807.     /* skip to the end of the header */

  1808.     i = get_bits_count(&s->gb);

  1809.     if(hdr_pos + hdr_size * 8 > i)

  1810.         skip_bits_long(&s->gb, hdr_pos + hdr_size * 8 - i);

  1811. 

  1812.     /* loop over the channel data sets */

  1813.     /* only decode as many channels as we've decoded base data for */

  1814.     for(chset = 0, chan_base = 0;

  1815.         chset < num_chsets && chan_base + n_xbr_ch[chset] <= s->prim_channels;

  1816.         chan_base += n_xbr_ch[chset++]) {

  1817.         int start_posn = get_bits_count(&s->gb);

  1818.         int subsubframe = 0;

  1819.         int subframe = 0;

  1820. 

  1821.         /* loop over subframes */

  1822.         for (k = 0; k < (s->sample_blocks / 8); k++) {

  1823.             /* parse header if we're on first subsubframe of a block */

  1824.             if(subsubframe == 0) {

  1825.                 /* Parse subframe header */

  1826.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1827.                     anctemp[i] = get_bits(&s->gb, 2) + 2;

  1828.                 }

  1829. 

  1830.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1831.                     get_array(&s->gb, abits_high[i], active_bands[chset][i], anctemp[i]);

  1832.                 }

  1833. 

  1834.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1835.                     anctemp[i] = get_bits(&s->gb, 3);

  1836.                     if(anctemp[i] < 1) {

  1837.                         av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: SYNC ERROR\n");

  1838.                         return AVERROR_INVALIDDATA;

  1839.                     }

  1840.                 }

  1841. 

  1842.                 /* generate scale factors */

  1843.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1844.                     const uint32_t *scale_table;

  1845.                     int nbits;

  1846. 

  1847.                     if (s->scalefactor_huffman[chan_base+i] == 6) {

  1848.                         scale_table = scale_factor_quant7;

  1849.                     } else {

  1850.                         scale_table = scale_factor_quant6;

  1851.                     }

  1852. 

  1853.                     nbits = anctemp[i];

  1854. 

  1855.                     for(j = 0; j < active_bands[chset][i]; j++) {

  1856.                         if(abits_high[i][j] > 0) {

  1857.                             scale_table_high[i][j][0] =

  1858.                                 scale_table[get_bits(&s->gb, nbits)];

  1859. 

  1860.                             if(xbr_tmode && s->transition_mode[i][j]) {

  1861.                                 scale_table_high[i][j][1] =

  1862.                                     scale_table[get_bits(&s->gb, nbits)];

  1863.                             }

  1864.                         }

  1865.                     }

  1866.                 }

  1867.             }

  1868. 

  1869.             /* decode audio array for this block */

  1870.             for(i = 0; i < n_xbr_ch[chset]; i++) {

  1871.                 for(j = 0; j < active_bands[chset][i]; j++) {

  1872.                     const int xbr_abits = abits_high[i][j];

  1873.                     const float quant_step_size = lossless_quant_d[xbr_abits];

  1874.                     const int sfi = xbr_tmode && s->transition_mode[i][j] && subsubframe >= s->transition_mode[i][j];

  1875.                     const float rscale = quant_step_size * scale_table_high[i][j][sfi];

  1876.                     float *subband_samples = s->subband_samples[k][chan_base+i][j];

  1877.                     int block[8];

  1878. 

  1879.                     if(xbr_abits <= 0)

  1880.                         continue;

  1881. 

  1882.                     if(xbr_abits > 7) {

  1883.                         get_array(&s->gb, block, 8, xbr_abits - 3);

  1884.                     } else {

  1885.                         int block_code1, block_code2, size, levels, err;

  1886. 

  1887.                         size   = abits_sizes[xbr_abits - 1];

  1888.                         levels = abits_levels[xbr_abits - 1];

  1889. 

  1890.                         block_code1 = get_bits(&s->gb, size);

  1891.                         block_code2 = get_bits(&s->gb, size);

  1892.                         err = decode_blockcodes(block_code1, block_code2,

  1893.                                                 levels, block);

  1894.                         if (err) {

  1895.                             av_log(s->avctx, AV_LOG_ERROR,

  1896.                                    "ERROR: DTS-XBR: block code look-up failed\n");

  1897.                             return AVERROR_INVALIDDATA;

  1898.                         }

  1899.                     }

  1900. 

  1901.                     /* scale & sum into subband */

  1902.                     for(l = 0; l < 8; l++)

  1903.                         subband_samples[l] += (float)block[l] * rscale;

  1904.                 }

  1905.             }

  1906. 

  1907.             /* check DSYNC marker */

  1908.             if(s->aspf || subsubframe == s->subsubframes[subframe] - 1) {

  1909.                 if(get_bits(&s->gb, 16) != 0xffff) {

  1910.                     av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: Didn't get subframe DSYNC\n");

  1911.                     return AVERROR_INVALIDDATA;

  1912.                 }

  1913.             }

  1914. 

  1915.             /* advance sub-sub-frame index */

  1916.             if(++subsubframe >= s->subsubframes[subframe]) {

  1917.                 subsubframe = 0;

  1918.                 subframe++;

  1919.             }

  1920.         }

  1921. 

  1922.         /* skip to next channel set */

  1923.         i = get_bits_count(&s->gb);

  1924.         if(start_posn + chset_fsize[chset] * 8 != i) {

  1925.             j = start_posn + chset_fsize[chset] * 8 - i;

  1926.             if(j < 0 || j >= 8)

  1927.                 av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: end of channel set,"

  1928.                        " skipping further than expected (%d bits)\n", j);

  1929.             skip_bits_long(&s->gb, j);

  1930.         }

  1931.     }

  1932. 

  1933.     return 0;

  1934. }

  1935. 

  1936. /* parse initial header for XXCH and dump details */

  1937. static int dca_xxch_decode_frame(DCAContext *s)

  1938. {

  1939.     int hdr_size, spkmsk_bits, num_chsets, core_spk, hdr_pos;

  1940.     int i, chset, base_channel, chstart, fsize[8];

  1941. 

  1942.     /* assume header word has already been parsed */

  1943.     hdr_pos     = get_bits_count(&s->gb) - 32;

  1944.     hdr_size    = get_bits(&s->gb, 6) + 1;

  1945.   /*chhdr_crc   =*/ skip_bits1(&s->gb);

  1946.     spkmsk_bits = get_bits(&s->gb, 5) + 1;

  1947.     num_chsets  = get_bits(&s->gb, 2) + 1;

  1948. 

  1949.     for (i = 0; i < num_chsets; i++)

  1950.         fsize[i] = get_bits(&s->gb, 14) + 1;

  1951. 

  1952.     core_spk               = get_bits(&s->gb, spkmsk_bits);

  1953.     s->xxch_core_spkmask   = core_spk;

  1954.     s->xxch_nbits_spk_mask = spkmsk_bits;

  1955.     s->xxch_dmix_embedded  = 0;

  1956. 

  1957.     /* skip to the end of the header */

  1958.     i = get_bits_count(&s->gb);

  1959.     if (hdr_pos + hdr_size * 8 > i)

  1960.         skip_bits_long(&s->gb, hdr_pos + hdr_size * 8 - i);

  1961. 

  1962.     for (chset = 0; chset < num_chsets; chset++) {

  1963.         chstart       = get_bits_count(&s->gb);

  1964.         base_channel  = s->prim_channels;

  1965.         s->xxch_chset = chset;

  1966. 

  1967.         /* XXCH and Core headers differ, see 6.4.2 "XXCH Channel Set Header" vs.

  1968.            5.3.2 "Primary Audio Coding Header", DTS Spec 1.3.1 */

  1969.         dca_parse_audio_coding_header(s, base_channel, 1);

  1970. 

  1971.         /* decode channel data */

  1972.         for (i = 0; i < (s->sample_blocks / 8); i++) {

  1973.             if (dca_decode_block(s, base_channel, i)) {

  1974.                 av_log(s->avctx, AV_LOG_ERROR,

  1975.                        "Error decoding DTS-XXCH extension\n");

  1976.                 continue;

  1977.             }

  1978.         }

  1979. 

  1980.         /* skip to end of this section */

  1981.         i = get_bits_count(&s->gb);

  1982.         if (chstart + fsize[chset] * 8 > i)

  1983.             skip_bits_long(&s->gb, chstart + fsize[chset] * 8 - i);

  1984.     }

  1985.     s->xxch_chset = num_chsets;

  1986. 

  1987.     return 0;

  1988. }

  1989. 

  1990. /**

  1991.  * Parse extension substream header (HD)

  1992.  */

  1993. static void dca_exss_parse_header(DCAContext *s)

  1994. {

  1995.     int asset_size[8];

  1996.     int ss_index;

  1997.     int blownup;

  1998.     int num_audiop = 1;

  1999.     int num_assets = 1;

  2000.     int active_ss_mask[8];

  2001.     int i, j;

  2002.     int start_posn;

  2003.     int hdrsize;

  2004.     uint32_t mkr;

  2005. 

  2006.     if (get_bits_left(&s->gb) < 52)

  2007.         return;

  2008. 

  2009.     start_posn = get_bits_count(&s->gb) - 32;

  2010. 

  2011.     skip_bits(&s->gb, 8); // user data

  2012.     ss_index = get_bits(&s->gb, 2);

  2013. 

  2014.     blownup = get_bits1(&s->gb);

  2015.     hdrsize = get_bits(&s->gb,  8 + 4 * blownup) + 1; // header_size

  2016.     skip_bits(&s->gb, 16 + 4 * blownup); // hd_size

  2017. 

  2018.     s->static_fields = get_bits1(&s->gb);

  2019.     if (s->static_fields) {

  2020.         skip_bits(&s->gb, 2); // reference clock code

  2021.         skip_bits(&s->gb, 3); // frame duration code

  2022. 

  2023.         if (get_bits1(&s->gb))

  2024.             skip_bits_long(&s->gb, 36); // timestamp

  2025. 

  2026.         /* a single stream can contain multiple audio assets that can be

  2027.          * combined to form multiple audio presentations */

  2028. 

  2029.         num_audiop = get_bits(&s->gb, 3) + 1;

  2030.         if (num_audiop > 1) {

  2031.             avpriv_request_sample(s->avctx,

  2032.                                   "Multiple DTS-HD audio presentations");

  2033.             /* ignore such streams for now */

  2034.             return;

  2035.         }

  2036. 

  2037.         num_assets = get_bits(&s->gb, 3) + 1;

  2038.         if (num_assets > 1) {

  2039.             avpriv_request_sample(s->avctx, "Multiple DTS-HD audio assets");

  2040.             /* ignore such streams for now */

  2041.             return;

  2042.         }

  2043. 

  2044.         for (i = 0; i < num_audiop; i++)

  2045.             active_ss_mask[i] = get_bits(&s->gb, ss_index + 1);

  2046. 

  2047.         for (i = 0; i < num_audiop; i++)

  2048.             for (j = 0; j <= ss_index; j++)

  2049.                 if (active_ss_mask[i] & (1 << j))

  2050.                     skip_bits(&s->gb, 8); // active asset mask

  2051. 

  2052.         s->mix_metadata = get_bits1(&s->gb);

  2053.         if (s->mix_metadata) {

  2054.             int mix_out_mask_size;

  2055. 

  2056.             skip_bits(&s->gb, 2); // adjustment level

  2057.             mix_out_mask_size  = (get_bits(&s->gb, 2) + 1) << 2;

  2058.             s->num_mix_configs =  get_bits(&s->gb, 2) + 1;

  2059. 

  2060.             for (i = 0; i < s->num_mix_configs; i++) {

  2061.                 int mix_out_mask        = get_bits(&s->gb, mix_out_mask_size);

  2062.                 s->mix_config_num_ch[i] = dca_exss_mask2count(mix_out_mask);

  2063.             }

  2064.         }

  2065.     }

  2066. 

  2067.     for (i = 0; i < num_assets; i++)

  2068.         asset_size[i] = get_bits_long(&s->gb, 16 + 4 * blownup);

  2069. 

  2070.     for (i = 0; i < num_assets; i++) {

  2071.         if (dca_exss_parse_asset_header(s))

  2072.             return;

  2073.     }

  2074. 

  2075.     /* not parsed further, we were only interested in the extensions mask

  2076.      * from the asset header */

  2077. 

  2078.         j = get_bits_count(&s->gb);

  2079.         if (start_posn + hdrsize * 8 > j)

  2080.             skip_bits_long(&s->gb, start_posn + hdrsize * 8 - j);

  2081. 

  2082.         for (i = 0; i < num_assets; i++) {

  2083.             start_posn = get_bits_count(&s->gb);

  2084.             mkr        = get_bits_long(&s->gb, 32);

  2085. 

  2086.             /* parse extensions that we know about */

  2087.             if (mkr == 0x655e315e) {

  2088.                 dca_xbr_parse_frame(s);

  2089.             } else if (mkr == 0x47004a03) {

  2090.                 dca_xxch_decode_frame(s);

  2091.                 s->core_ext_mask |= DCA_EXT_XXCH; /* xxx use for chan reordering */

  2092.             } else {

  2093.                 av_log(s->avctx, AV_LOG_DEBUG,

  2094.                        "DTS-ExSS: unknown marker = 0x%08x\n", mkr);

  2095.             }

  2096. 

  2097.             /* skip to end of block */

  2098.             j = get_bits_count(&s->gb);

  2099.             if (start_posn + asset_size[i] * 8 > j)

  2100.                 skip_bits_long(&s->gb, start_posn + asset_size[i] * 8 - j);

  2101.         }

  2102. }

  2103. 

  2104. /**

  2105.  * Main frame decoding function

  2106.  * FIXME add arguments

  2107.  */

  2108. static int dca_decode_frame(AVCodecContext *avctx, void *data,

  2109.                             int *got_frame_ptr, AVPacket *avpkt)

  2110. {

  2111.     AVFrame *frame     = data;

  2112.     const uint8_t *buf = avpkt->data;

  2113.     int buf_size = avpkt->size;

  2114.     int channel_mask;

  2115.     int channel_layout;

  2116.     int lfe_samples;

  2117.     int num_core_channels = 0;

  2118.     int i, ret;

  2119.     float **samples_flt;

  2120.     float *src_chan;

  2121.     float *dst_chan;

  2122.     DCAContext *s = avctx->priv_data;

  2123.     int core_ss_end;

  2124.     int channels, full_channels;

  2125.     float scale;

  2126.     int achan;

  2127.     int chset;

  2128.     int mask;

  2129.     int lavc;

  2130.     int posn;

  2131.     int j, k;

  2132.     int endch;

  2133. 

  2134.     s->xch_present = 0;

  2135. 

  2136.     s->dca_buffer_size = ff_dca_convert_bitstream(buf, buf_size, s->dca_buffer,

  2137.                                                   DCA_MAX_FRAME_SIZE + DCA_MAX_EXSS_HEADER_SIZE);

  2138.     if (s->dca_buffer_size == AVERROR_INVALIDDATA) {

  2139.         av_log(avctx, AV_LOG_ERROR, "Not a valid DCA frame\n");

  2140.         return AVERROR_INVALIDDATA;

  2141.     }

  2142. 

  2143.     if ((ret = dca_parse_frame_header(s)) < 0) {

  2144.         //seems like the frame is corrupt, try with the next one

  2145.         return ret;

  2146.     }

  2147.     //set AVCodec values with parsed data

  2148.     avctx->sample_rate = s->sample_rate;

  2149.     avctx->bit_rate    = s->bit_rate;

  2150. 

  2151.     s->profile = FF_PROFILE_DTS;

  2152. 

  2153.     for (i = 0; i < (s->sample_blocks / 8); i++) {

  2154.         if ((ret = dca_decode_block(s, 0, i))) {

  2155.             av_log(avctx, AV_LOG_ERROR, "error decoding block\n");

  2156.             return ret;

  2157.         }

  2158.     }

  2159. 

  2160.     /* record number of core channels incase less than max channels are requested */

  2161.     num_core_channels = s->prim_channels;

  2162. 

  2163.     if (s->prim_channels + !!s->lfe > 2 &&

  2164.         avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {

  2165.             /* Stereo downmix coefficients

  2166.              *

  2167.              * The decoder can only downmix to 2-channel, so we need to ensure

  2168.              * embedded downmix coefficients are actually targeting 2-channel.

  2169.              */

  2170.             if (s->core_downmix && (s->core_downmix_amode == DCA_STEREO ||

  2171.                                     s->core_downmix_amode == DCA_STEREO_TOTAL)) {

  2172.                 int sign, code;

  2173.                 for (i = 0; i < num_core_channels + !!s->lfe; i++) {

  2174.                     sign = s->core_downmix_codes[i][0] & 0x100 ? 1 : -1;

  2175.                     code = s->core_downmix_codes[i][0] & 0x0FF;

  2176.                     s->downmix_coef[i][0] = (!code ? 0.0f :

  2177.                                              sign * dca_dmixtable[code - 1]);

  2178.                     sign = s->core_downmix_codes[i][1] & 0x100 ? 1 : -1;

  2179.                     code = s->core_downmix_codes[i][1] & 0x0FF;

  2180.                     s->downmix_coef[i][1] = (!code ? 0.0f :

  2181.                                              sign * dca_dmixtable[code - 1]);

  2182.                 }

  2183.                 s->output = s->core_downmix_amode;

  2184.             } else {

  2185.                 int am = s->amode & DCA_CHANNEL_MASK;

  2186.                 if (am >= FF_ARRAY_ELEMS(dca_default_coeffs)) {

  2187.                     av_log(s->avctx, AV_LOG_ERROR,

  2188.                            "Invalid channel mode %d\n", am);

  2189.                     return AVERROR_INVALIDDATA;

  2190.                 }

  2191.                 if (num_core_channels + !!s->lfe >

  2192.                     FF_ARRAY_ELEMS(dca_default_coeffs[0])) {

  2193.                     avpriv_request_sample(s->avctx, "Downmixing %d channels",

  2194.                                           s->prim_channels + !!s->lfe);

  2195.                     return AVERROR_PATCHWELCOME;

  2196.                 }

  2197.                 for (i = 0; i < num_core_channels + !!s->lfe; i++) {

  2198.                     s->downmix_coef[i][0] = dca_default_coeffs[am][i][0];

  2199.                     s->downmix_coef[i][1] = dca_default_coeffs[am][i][1];

  2200.                 }

  2201.             }

  2202.             av_dlog(s->avctx, "Stereo downmix coeffs:\n");

  2203.             for (i = 0; i < num_core_channels + !!s->lfe; i++) {

  2204.                 av_dlog(s->avctx, "L, input channel %d = %f\n", i,

  2205.                         s->downmix_coef[i][0]);

  2206.                 av_dlog(s->avctx, "R, input channel %d = %f\n", i,

  2207.                         s->downmix_coef[i][1]);

  2208.             }

  2209.             av_dlog(s->avctx, "\n");

  2210.     }

  2211. 

  2212.     if (s->ext_coding)

  2213.         s->core_ext_mask = dca_ext_audio_descr_mask[s->ext_descr];

  2214.     else

  2215.         s->core_ext_mask = 0;

  2216. 

  2217.     core_ss_end = FFMIN(s->frame_size, s->dca_buffer_size) * 8;

  2218. 

  2219.     /* only scan for extensions if ext_descr was unknown or indicated a

  2220.      * supported XCh extension */

  2221.     if (s->core_ext_mask < 0 || s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH)) {

  2222. 

  2223.         /* if ext_descr was unknown, clear s->core_ext_mask so that the

  2224.          * extensions scan can fill it up */

  2225.         s->core_ext_mask = FFMAX(s->core_ext_mask, 0);

  2226. 

  2227.         /* extensions start at 32-bit boundaries into bitstream */

  2228.         skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);

  2229. 

  2230.         while (core_ss_end - get_bits_count(&s->gb) >= 32) {

  2231.             uint32_t bits = get_bits_long(&s->gb, 32);

  2232. 

  2233.             switch (bits) {

  2234.             case 0x5a5a5a5a: {

  2235.                 int ext_amode, xch_fsize;

  2236. 

  2237.                 s->xch_base_channel = s->prim_channels;

  2238. 

  2239.                 /* validate sync word using XCHFSIZE field */

  2240.                 xch_fsize = show_bits(&s->gb, 10);

  2241.                 if ((s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize) &&

  2242.                     (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize + 1))

  2243.                     continue;

  2244. 

  2245.                 /* skip length-to-end-of-frame field for the moment */

  2246.                 skip_bits(&s->gb, 10);

  2247. 

  2248.                 s->core_ext_mask |= DCA_EXT_XCH;

  2249. 

  2250.                 /* extension amode(number of channels in extension) should be 1 */

  2251.                 /* AFAIK XCh is not used for more channels */

  2252.                 if ((ext_amode = get_bits(&s->gb, 4)) != 1) {

  2253.                     av_log(avctx, AV_LOG_ERROR, "XCh extension amode %d not"

  2254.                            " supported!\n", ext_amode);

  2255.                     continue;

  2256.                 }

  2257. 

  2258.                 if (s->xch_base_channel < 2) {

  2259.                     avpriv_request_sample(avctx, "XCh with fewer than 2 base channels");

  2260.                     continue;

  2261.                 }

  2262. 

  2263.                 /* much like core primary audio coding header */

  2264.                 dca_parse_audio_coding_header(s, s->xch_base_channel, 0);

  2265. 

  2266.                 for (i = 0; i < (s->sample_blocks / 8); i++)

  2267.                     if ((ret = dca_decode_block(s, s->xch_base_channel, i))) {

  2268.                         av_log(avctx, AV_LOG_ERROR, "error decoding XCh extension\n");

  2269.                         continue;

  2270.                     }

  2271. 

  2272.                 s->xch_present = 1;

  2273.                 break;

  2274.             }

  2275.             case 0x47004a03:

  2276.                 /* XXCh: extended channels */

  2277.                 /* usually found either in core or HD part in DTS-HD HRA streams,

  2278.                  * but not in DTS-ES which contains XCh extensions instead */

  2279.                 s->core_ext_mask |= DCA_EXT_XXCH;

  2280.                 dca_xxch_decode_frame(s);

  2281.                 break;

  2282. 

  2283.             case 0x1d95f262: {

  2284.                 int fsize96 = show_bits(&s->gb, 12) + 1;

  2285.                 if (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + fsize96)

  2286.                     continue;

  2287. 

  2288.                 av_log(avctx, AV_LOG_DEBUG, "X96 extension found at %d bits\n",

  2289.                        get_bits_count(&s->gb));

  2290.                 skip_bits(&s->gb, 12);

  2291.                 av_log(avctx, AV_LOG_DEBUG, "FSIZE96 = %d bytes\n", fsize96);

  2292.                 av_log(avctx, AV_LOG_DEBUG, "REVNO = %d\n", get_bits(&s->gb, 4));

  2293. 

  2294.                 s->core_ext_mask |= DCA_EXT_X96;

  2295.                 break;

  2296.             }

  2297.             }

  2298. 

  2299.             skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);

  2300.         }

  2301.     } else {

  2302.         /* no supported extensions, skip the rest of the core substream */

  2303.         skip_bits_long(&s->gb, core_ss_end - get_bits_count(&s->gb));

  2304.     }

  2305. 

  2306.     if (s->core_ext_mask & DCA_EXT_X96)

  2307.         s->profile = FF_PROFILE_DTS_96_24;

  2308.     else if (s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH))

  2309.         s->profile = FF_PROFILE_DTS_ES;

  2310. 

  2311.     /* check for ExSS (HD part) */

  2312.     if (s->dca_buffer_size - s->frame_size > 32 &&

  2313.         get_bits_long(&s->gb, 32) == DCA_HD_MARKER)

  2314.         dca_exss_parse_header(s);

  2315. 

  2316.     avctx->profile = s->profile;

  2317. 

  2318.     full_channels = channels = s->prim_channels + !!s->lfe;

  2319. 

  2320.     /* If we have XXCH then the channel layout is managed differently */

  2321.     /* note that XLL will also have another way to do things */

  2322.     if (!(s->core_ext_mask & DCA_EXT_XXCH)

  2323.         || (s->core_ext_mask & DCA_EXT_XXCH && avctx->request_channels > 0

  2324.             && avctx->request_channels

  2325.             < num_core_channels + !!s->lfe + s->xxch_chset_nch[0]))

  2326.     { /* xxx should also do MA extensions */

  2327.         if (s->amode < 16) {

  2328.             avctx->channel_layout = dca_core_channel_layout[s->amode];

  2329. 

  2330.             if (s->prim_channels + !!s->lfe > 2 &&

  2331.                 avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {

  2332.                 /*

  2333.                  * Neither the core's auxiliary data nor our default tables contain

  2334.                  * downmix coefficients for the additional channel coded in the XCh

  2335.                  * extension, so when we're doing a Stereo downmix, don't decode it.

  2336.                  */

  2337.                 s->xch_disable = 1;

  2338.             }

  2339. 

  2340. #if FF_API_REQUEST_CHANNELS

  2341. FF_DISABLE_DEPRECATION_WARNINGS

  2342.             if (s->xch_present && !s->xch_disable &&

  2343.                 (!avctx->request_channels ||

  2344.                  avctx->request_channels > num_core_channels + !!s->lfe)) {

  2345. FF_ENABLE_DEPRECATION_WARNINGS

  2346. #else

  2347.             if (s->xch_present && !s->xch_disable) {

  2348. #endif

  2349.                 avctx->channel_layout |= AV_CH_BACK_CENTER;

  2350.                 if (s->lfe) {

  2351.                     avctx->channel_layout |= AV_CH_LOW_FREQUENCY;

  2352.                     s->channel_order_tab = dca_channel_reorder_lfe_xch[s->amode];

  2353.                 } else {

  2354.                     s->channel_order_tab = dca_channel_reorder_nolfe_xch[s->amode];

  2355.                 }

  2356.                 if (s->channel_order_tab[s->xch_base_channel] < 0)

  2357.                     return AVERROR_INVALIDDATA;

  2358.             } else {

  2359.                 channels = num_core_channels + !!s->lfe;

  2360.                 s->xch_present = 0; /* disable further xch processing */

  2361.                 if (s->lfe) {

  2362.                     avctx->channel_layout |= AV_CH_LOW_FREQUENCY;

  2363.                     s->channel_order_tab = dca_channel_reorder_lfe[s->amode];

  2364.                 } else

  2365.                     s->channel_order_tab = dca_channel_reorder_nolfe[s->amode];

  2366.             }

  2367. 

  2368.             if (channels > !!s->lfe &&

  2369.                 s->channel_order_tab[channels - 1 - !!s->lfe] < 0)

  2370.                 return AVERROR_INVALIDDATA;

  2371. 

  2372.             if (av_get_channel_layout_nb_channels(avctx->channel_layout) != channels) {

  2373.                 av_log(avctx, AV_LOG_ERROR, "Number of channels %d mismatches layout %d\n", channels, av_get_channel_layout_nb_channels(avctx->channel_layout));

  2374.                 return AVERROR_INVALIDDATA;

  2375.             }

  2376. 

  2377.             if (num_core_channels + !!s->lfe > 2 &&

  2378.                 avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {

  2379.                 channels = 2;

  2380.                 s->output = s->prim_channels == 2 ? s->amode : DCA_STEREO;

  2381.                 avctx->channel_layout = AV_CH_LAYOUT_STEREO;

  2382.             }

  2383.             else if (avctx->request_channel_layout & AV_CH_LAYOUT_NATIVE) {

  2384.                 static const int8_t dca_channel_order_native[9] = { 0, 1, 2, 3, 4, 5, 6, 7, 8 };

  2385.                 s->channel_order_tab = dca_channel_order_native;

  2386.             }

  2387.             s->lfe_index = dca_lfe_index[s->amode];

  2388.         } else {

  2389.             av_log(avctx, AV_LOG_ERROR,

  2390.                    "Non standard configuration %d !\n", s->amode);

  2391.             return AVERROR_INVALIDDATA;

  2392.         }

  2393. 

  2394.         s->xxch_dmix_embedded = 0;

  2395.     } else {

  2396.         /* we only get here if an XXCH channel set can be added to the mix */

  2397.         channel_mask = s->xxch_core_spkmask;

  2398. 

  2399.         if (avctx->request_channels > 0

  2400.             && avctx->request_channels < s->prim_channels) {

  2401.             channels = num_core_channels + !!s->lfe;

  2402.             for (i = 0; i < s->xxch_chset && channels + s->xxch_chset_nch[i]

  2403.                                               <= avctx->request_channels; i++) {

  2404.                 channels += s->xxch_chset_nch[i];

  2405.                 channel_mask |= s->xxch_spk_masks[i];

  2406.             }

  2407.         } else {

  2408.             channels = s->prim_channels + !!s->lfe;

  2409.             for (i = 0; i < s->xxch_chset; i++) {

  2410.                 channel_mask |= s->xxch_spk_masks[i];

  2411.             }

  2412.         }

  2413. 

  2414.         /* Given the DTS spec'ed channel mask, generate an avcodec version */

  2415.         channel_layout = 0;

  2416.         for (i = 0; i < s->xxch_nbits_spk_mask; ++i) {

  2417.             if (channel_mask & (1 << i)) {

  2418.                 channel_layout |= map_xxch_to_native[i];

  2419.             }

  2420.         }

  2421. 

  2422.         /* make sure that we have managed to get equivelant dts/avcodec channel

  2423.          * masks in some sense -- unfortunately some channels could overlap */

  2424.         if (av_popcount(channel_mask) != av_popcount(channel_layout)) {

  2425.             av_log(avctx, AV_LOG_DEBUG,

  2426.                    "DTS-XXCH: Inconsistent avcodec/dts channel layouts\n");

  2427.             return AVERROR_INVALIDDATA;

  2428.         }

  2429. 

  2430.         avctx->channel_layout = channel_layout;

  2431. 

  2432.         if (!(avctx->request_channel_layout & AV_CH_LAYOUT_NATIVE)) {

  2433.             /* Estimate DTS --> avcodec ordering table */

  2434.             for (chset = -1, j = 0; chset < s->xxch_chset; ++chset) {

  2435.                 mask = chset >= 0 ? s->xxch_spk_masks[chset]

  2436.                                   : s->xxch_core_spkmask;

  2437.                 for (i = 0; i < s->xxch_nbits_spk_mask; i++) {

  2438.                     if (mask & ~(DCA_XXCH_LFE1 | DCA_XXCH_LFE2) & (1 << i)) {

  2439.                         lavc = map_xxch_to_native[i];

  2440.                         posn = av_popcount(channel_layout & (lavc - 1));

  2441.                         s->xxch_order_tab[j++] = posn;

  2442.                     }

  2443.                 }

  2444. 

  2445.             }

  2446. 

  2447.             s->lfe_index = av_popcount(channel_layout & (AV_CH_LOW_FREQUENCY-1));

  2448.         } else { /* native ordering */

  2449.             for (i = 0; i < channels; i++)

  2450.                 s->xxch_order_tab[i] = i;

  2451. 

  2452.             s->lfe_index = channels - 1;

  2453.         }

  2454. 

  2455.         s->channel_order_tab = s->xxch_order_tab;

  2456.     }

  2457. 

  2458.     if (avctx->channels != channels) {

  2459.         if (avctx->channels)

  2460.             av_log(avctx, AV_LOG_INFO, "Number of channels changed in DCA decoder (%d -> %d)\n", avctx->channels, channels);

  2461.         avctx->channels = channels;

  2462.     }

  2463. 

  2464.     /* get output buffer */

  2465.     frame->nb_samples = 256 * (s->sample_blocks / 8);

  2466.     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)

  2467.         return ret;

  2468.     samples_flt = (float **)frame->extended_data;

  2469. 

  2470.     /* allocate buffer for extra channels if downmixing */

  2471.     if (avctx->channels < full_channels) {

  2472.         ret = av_samples_get_buffer_size(NULL, full_channels - channels,

  2473.                                          frame->nb_samples,

  2474.                                          avctx->sample_fmt, 0);

  2475.         if (ret < 0)

  2476.             return ret;

  2477. 

  2478.         av_fast_malloc(&s->extra_channels_buffer,

  2479.                        &s->extra_channels_buffer_size, ret);

  2480.         if (!s->extra_channels_buffer)

  2481.             return AVERROR(ENOMEM);

  2482. 

  2483.         ret = av_samples_fill_arrays((uint8_t **)s->extra_channels, NULL,

  2484.                                      s->extra_channels_buffer,

  2485.                                      full_channels - channels,

  2486.                                      frame->nb_samples, avctx->sample_fmt, 0);

  2487.         if (ret < 0)

  2488.             return ret;

  2489.     }

  2490. 

  2491.     /* filter to get final output */

  2492.     for (i = 0; i < (s->sample_blocks / 8); i++) {

  2493.         int ch;

  2494. 

  2495.         for (ch = 0; ch < channels; ch++)

  2496.             s->samples_chanptr[ch] = samples_flt[ch] + i * 256;

  2497.         for (; ch < full_channels; ch++)

  2498.             s->samples_chanptr[ch] = s->extra_channels[ch - channels] + i * 256;

  2499. 

  2500.         dca_filter_channels(s, i);

  2501. 

  2502.         /* If this was marked as a DTS-ES stream we need to subtract back- */

  2503.         /* channel from SL & SR to remove matrixed back-channel signal */

  2504.         if ((s->source_pcm_res & 1) && s->xch_present) {

  2505.             float *back_chan = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel]];

  2506.             float *lt_chan   = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel - 2]];

  2507.             float *rt_chan   = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel - 1]];

  2508.             s->fdsp.vector_fmac_scalar(lt_chan, back_chan, -M_SQRT1_2, 256);

  2509.             s->fdsp.vector_fmac_scalar(rt_chan, back_chan, -M_SQRT1_2, 256);

  2510.         }

  2511. 

  2512.         /* If stream contains XXCH, we might need to undo an embedded downmix */

  2513.         if (s->xxch_dmix_embedded) {

  2514.             /* Loop over channel sets in turn */

  2515.             ch = num_core_channels;

  2516.             for (chset = 0; chset < s->xxch_chset; chset++) {

  2517.                 endch = ch + s->xxch_chset_nch[chset];

  2518.                 mask = s->xxch_dmix_embedded;

  2519. 

  2520.                 /* undo downmix */

  2521.                 for (j = ch; j < endch; j++) {

  2522.                     if (mask & (1 << j)) { /* this channel has been mixed-out */

  2523.                         src_chan = s->samples_chanptr[s->channel_order_tab[j]];

  2524.                         for (k = 0; k < endch; k++) {

  2525.                             achan = s->channel_order_tab[k];

  2526.                             scale = s->xxch_dmix_coeff[j][k];

  2527.                             if (scale != 0.0) {

  2528.                                 dst_chan = s->samples_chanptr[achan];

  2529.                                 s->fdsp.vector_fmac_scalar(dst_chan, src_chan,

  2530.                                                            -scale, 256);

  2531.                             }

  2532.                         }

  2533.                     }

  2534.                 }

  2535. 

  2536.                 /* if a downmix has been embedded then undo the pre-scaling */

  2537.                 if ((mask & (1 << ch)) && s->xxch_dmix_sf[chset] != 1.0f) {

  2538.                     scale = s->xxch_dmix_sf[chset];

  2539. 

  2540.                     for (j = 0; j < ch; j++) {

  2541.                         src_chan = s->samples_chanptr[s->channel_order_tab[j]];

  2542.                         for (k = 0; k < 256; k++)

  2543.                             src_chan[k] *= scale;

  2544.                     }

  2545. 

  2546.                     /* LFE channel is always part of core, scale if it exists */

  2547.                     if (s->lfe) {

  2548.                         src_chan = s->samples_chanptr[s->lfe_index];

  2549.                         for (k = 0; k < 256; k++)

  2550.                             src_chan[k] *= scale;

  2551.                     }

  2552.                 }

  2553. 

  2554.                 ch = endch;

  2555.             }

  2556. 

  2557.         }

  2558.     }

  2559. 

  2560.     /* update lfe history */

  2561.     lfe_samples = 2 * s->lfe * (s->sample_blocks / 8);

  2562.     for (i = 0; i < 2 * s->lfe * 4; i++)

  2563.         s->lfe_data[i] = s->lfe_data[i + lfe_samples];

  2564. 

  2565.     /* AVMatrixEncoding

  2566.      *

  2567.      * DCA_STEREO_TOTAL (Lt/Rt) is equivalent to Dolby Surround */

  2568.     ret = ff_side_data_update_matrix_encoding(frame,

  2569.                                               (s->output & ~DCA_LFE) == DCA_STEREO_TOTAL ?

  2570.                                               AV_MATRIX_ENCODING_DOLBY : AV_MATRIX_ENCODING_NONE);

  2571.     if (ret < 0)

  2572.         return ret;

  2573. 

  2574.     *got_frame_ptr = 1;

  2575. 

  2576.     return buf_size;

  2577. }

  2578. 

  2579. 

  2580. 

  2581. /**

  2582.  * DCA initialization

  2583.  *

  2584.  * @param avctx     pointer to the AVCodecContext

  2585.  */

  2586. 

  2587. static av_cold int dca_decode_init(AVCodecContext *avctx)

  2588. {

  2589.     DCAContext *s = avctx->priv_data;

  2590. 

  2591.     s->avctx = avctx;

  2592.     dca_init_vlcs();

  2593. 

  2594.     avpriv_float_dsp_init(&s->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);

  2595.     ff_mdct_init(&s->imdct, 6, 1, 1.0);

  2596.     ff_synth_filter_init(&s->synth);

  2597.     ff_dcadsp_init(&s->dcadsp);

  2598.     ff_fmt_convert_init(&s->fmt_conv, avctx);

  2599. 

  2600.     avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;

  2601. 

  2602.     /* allow downmixing to stereo */

  2603. #if FF_API_REQUEST_CHANNELS

  2604. FF_DISABLE_DEPRECATION_WARNINGS

  2605.     if (avctx->request_channels == 2)

  2606.         avctx->request_channel_layout = AV_CH_LAYOUT_STEREO;

  2607. FF_ENABLE_DEPRECATION_WARNINGS

  2608. #endif

  2609.     if (avctx->channels > 2 &&

  2610.         avctx->request_channel_layout == AV_CH_LAYOUT_STEREO)

  2611.         avctx->channels = 2;

  2612. 

  2613.     return 0;

  2614. }

  2615. 

  2616. static av_cold int dca_decode_end(AVCodecContext *avctx)

  2617. {

  2618.     DCAContext *s = avctx->priv_data;

  2619.     ff_mdct_end(&s->imdct);

  2620.     av_freep(&s->extra_channels_buffer);

  2621.     return 0;

  2622. }

  2623. 

  2624. static const AVProfile profiles[] = {

  2625.     { FF_PROFILE_DTS,        "DTS"        },

  2626.     { FF_PROFILE_DTS_ES,     "DTS-ES"     },

  2627.     { FF_PROFILE_DTS_96_24,  "DTS 96/24"  },

  2628.     { FF_PROFILE_DTS_HD_HRA, "DTS-HD HRA" },

  2629.     { FF_PROFILE_DTS_HD_MA,  "DTS-HD MA"  },

  2630.     { FF_PROFILE_UNKNOWN },

  2631. };

  2632. 

  2633. static const AVOption options[] = {

  2634.     { "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 },

  2635.     { NULL },

  2636. };

  2637. 

  2638. static const AVClass dca_decoder_class = {

  2639.     .class_name = "DCA decoder",

  2640.     .item_name  = av_default_item_name,

  2641.     .option     = options,

  2642.     .version    = LIBAVUTIL_VERSION_INT,

  2643.     .category   = AV_CLASS_CATEGORY_DECODER,

  2644. };

  2645. 

  2646. AVCodec ff_dca_decoder = {

  2647.     .name            = "dca",

  2648.     .long_name       = NULL_IF_CONFIG_SMALL("DCA (DTS Coherent Acoustics)"),

  2649.     .type            = AVMEDIA_TYPE_AUDIO,

  2650.     .id              = AV_CODEC_ID_DTS,

  2651.     .priv_data_size  = sizeof(DCAContext),

  2652.     .init            = dca_decode_init,

  2653.     .decode          = dca_decode_frame,

  2654.     .close           = dca_decode_end,

  2655.     .capabilities    = CODEC_CAP_CHANNEL_CONF | CODEC_CAP_DR1,

  2656.     .sample_fmts     = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,

  2657.                                                        AV_SAMPLE_FMT_NONE },

  2658.     .profiles        = NULL_IF_CONFIG_SMALL(profiles),

  2659.     .priv_class      = &dca_decoder_class,

  2660. };