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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/samplefmt.h"

  36. #include "avcodec.h"

  37. #include "fft.h"

  38. #include "get_bits.h"

  39. #include "dcadata.h"

  40. #include "dcahuff.h"

  41. #include "dca.h"

  42. #include "mathops.h"

  43. #include "synth_filter.h"

  44. #include "dcadsp.h"

  45. #include "fmtconvert.h"

  46. #include "internal.h"

  47. 

  48. #if ARCH_ARM

  49. #   include "arm/dca.h"

  50. #endif

  51. 

  52. //#define TRACE

  53. 

  54. #define DCA_PRIM_CHANNELS_MAX  (7)

  55. #define DCA_SUBBANDS          (64)

  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. /** Bit allocation */

  329. typedef struct {

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

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

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

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

  334. } BitAlloc;

  335. 

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

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

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

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

  340. 

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

  342.                                          int idx)

  343. {

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

  345.            ba->offset;

  346. }

  347. 

  348. typedef struct {

  349.     AVCodecContext *avctx;

  350.     /* Frame header */

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

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

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

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

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

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

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

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

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

  360. 

  361.     int downmix;                ///< embedded downmix enabled

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

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

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

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

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

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

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

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

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

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

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

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

  374.     int copy_history;           ///< copy history

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

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

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

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

  379. 

  380.     /* Primary audio coding header */

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

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

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

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

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

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

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

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

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

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

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

  392. 

  393.     /* Primary audio coding side information */

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

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

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

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

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

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

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

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

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

  403.     int downmix_coef[DCA_PRIM_CHANNELS_MAX][2];                  ///< stereo downmix coefficients

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

  405. 

  406.     int high_freq_vq[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS];       ///< VQ encoded high frequency subbands

  407. 

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

  409.     int lfe_scale_factor;

  410. 

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

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

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

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

  415.     int hist_index[DCA_PRIM_CHANNELS_MAX];

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

  417. 

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

  419. 

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

  421.     float *samples_chanptr[DCA_PRIM_CHANNELS_MAX + 1];

  422.     float *extra_channels[DCA_PRIM_CHANNELS_MAX + 1];

  423.     uint8_t *extra_channels_buffer;

  424.     unsigned int extra_channels_buffer_size;

  425. 

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

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

  428. 

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

  430.     GetBitContext gb;

  431.     /* Current position in DCA frame */

  432.     int current_subframe;

  433.     int current_subsubframe;

  434. 

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

  436. 

  437.     /* XCh extension information */

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

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

  440. 

  441.     /* XXCH extension information */

  442.     int xxch_chset;

  443.     int xxch_nbits_spk_mask;

  444.     uint32_t xxch_core_spkmask;

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

  446.     int xxch_chset_nch[4];

  447.     float xxch_dmix_sf[DCA_CHSETS_MAX];

  448. 

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

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

  451. 

  452.     int8_t xxch_order_tab[32];

  453.     int8_t lfe_index;

  454. 

  455.     /* ExSS header parser */

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

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

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

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

  460. 

  461.     int profile;

  462. 

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

  464.     AVFloatDSPContext fdsp;

  465.     FFTContext imdct;

  466.     SynthFilterContext synth;

  467.     DCADSPContext dcadsp;

  468.     FmtConvertContext fmt_conv;

  469. } DCAContext;

  470. 

  471. static const uint16_t dca_vlc_offs[] = {

  472.         0,   512,   640,   768,  1282,  1794,  2436,  3080,  3770,  4454,  5364,

  473.      5372,  5380,  5388,  5392,  5396,  5412,  5420,  5428,  5460,  5492,  5508,

  474.      5572,  5604,  5668,  5796,  5860,  5892,  6412,  6668,  6796,  7308,  7564,

  475.      7820,  8076,  8620,  9132,  9388,  9910, 10166, 10680, 11196, 11726, 12240,

  476.     12752, 13298, 13810, 14326, 14840, 15500, 16022, 16540, 17158, 17678, 18264,

  477.     18796, 19352, 19926, 20468, 21472, 22398, 23014, 23622,

  478. };

  479. 

  480. static av_cold void dca_init_vlcs(void)

  481. {

  482.     static int vlcs_initialized = 0;

  483.     int i, j, c = 14;

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

  485. 

  486.     if (vlcs_initialized)

  487.         return;

  488. 

  489.     dca_bitalloc_index.offset = 1;

  490.     dca_bitalloc_index.wrap = 2;

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

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

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

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

  495.                  bitalloc_12_bits[i], 1, 1,

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

  497.     }

  498.     dca_scalefactor.offset = -64;

  499.     dca_scalefactor.wrap = 2;

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

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

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

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

  504.                  scales_bits[i], 1, 1,

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

  506.     }

  507.     dca_tmode.offset = 0;

  508.     dca_tmode.wrap = 1;

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

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

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

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

  513.                  tmode_bits[i], 1, 1,

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

  515.     }

  516. 

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

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

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

  520.                 break;

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

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

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

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

  525. 

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

  527.                      bitalloc_sizes[i],

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

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

  530.             c++;

  531.         }

  532.     vlcs_initialized = 1;

  533. }

  534. 

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

  536. {

  537.     while (len--)

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

  539. }

  540. 

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

  542. {

  543.     int i, base, mask;

  544. 

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

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

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

  548.         base += av_popcount(mask);

  549. 

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

  551. }

  552. 

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

  554.                                          int xxch)

  555. {

  556.     int i, j;

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

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

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

  560.     int hdr_pos = 0, hdr_size = 0;

  561.     float sign, mag, scale_factor;

  562.     int this_chans, acc_mask;

  563.     int embedded_downmix;

  564.     int nchans, mask[8];

  565.     int coeff, ichan;

  566. 

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

  568.     if (xxch) {

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

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

  571.     }

  572. 

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

  574.     s->total_channels = nchans + base_channel;

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

  576. 

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

  578.     if (xxch) {

  579.         acc_mask = s->xxch_core_spkmask;

  580. 

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

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

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

  584. 

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

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

  587. 

  588.         /* check for downmixing information */

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

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

  591.             scale_factor     =

  592.                1.0f / dca_downmix_scale_factors[(get_bits(&s->gb, 6) - 1) << 2];

  593. 

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

  595. 

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

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

  598.             }

  599. 

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

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

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

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

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

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

  606.                             av_log(s->avctx, AV_LOG_WARNING,

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

  608.                             continue;

  609.                         }

  610. 

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

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

  613.                         mag   = dca_downmix_scale_factors[((coeff & 63) - 1) << 2];

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

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

  616.                     }

  617.                 }

  618.             }

  619.         }

  620.     }

  621. 

  622.     if (s->prim_channels > DCA_PRIM_CHANNELS_MAX)

  623.         s->prim_channels = DCA_PRIM_CHANNELS_MAX;

  624. 

  625. 

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

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

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

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

  630.     }

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

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

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

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

  635.     }

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

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

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

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

  640. 

  641.     /* Get codebooks quantization indexes */

  642.     if (!base_channel)

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

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

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

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

  647. 

  648.     /* Get scale factor adjustment */

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

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

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

  652. 

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

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

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

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

  657. 

  658.     if (!xxch) {

  659.         if (s->crc_present) {

  660.             /* Audio header CRC check */

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

  662.         }

  663.     } else {

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

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

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

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

  668.     }

  669. 

  670.     s->current_subframe    = 0;

  671.     s->current_subsubframe = 0;

  672. 

  673. #ifdef TRACE

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

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

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

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

  678.                s->subband_activity[i]);

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

  680.                s->vq_start_subband[i]);

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

  682.                s->joint_intensity[i]);

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

  684.                s->transient_huffman[i]);

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

  686.                s->scalefactor_huffman[i]);

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

  688.                s->bitalloc_huffman[i]);

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

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

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

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

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

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

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

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

  697.     }

  698. #endif

  699. 

  700.     return 0;

  701. }

  702. 

  703. static int dca_parse_frame_header(DCAContext *s)

  704. {

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

  706. 

  707.     /* Sync code */

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

  709. 

  710.     /* Frame header */

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

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

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

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

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

  716.     if (s->frame_size < 95)

  717.         return AVERROR_INVALIDDATA;

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

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

  720.     if (!s->sample_rate)

  721.         return AVERROR_INVALIDDATA;

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

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

  724.     if (!s->bit_rate)

  725.         return AVERROR_INVALIDDATA;

  726. 

  727.     s->downmix           = get_bits(&s->gb, 1); /* note: this is FixedBit == 0 */

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

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

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

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

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

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

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

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

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

  737. 

  738.     if (s->lfe == 3) {

  739.         s->lfe = 0;

  740.         avpriv_request_sample(s->avctx, "LFE = 3");

  741.         return AVERROR_PATCHWELCOME;

  742.     }

  743. 

  744.     /* TODO: check CRC */

  745.     if (s->crc_present)

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

  747. 

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

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

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

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

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

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

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

  755. 

  756.     /* FIXME: channels mixing levels */

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

  758.     if (s->lfe)

  759.         s->output |= DCA_LFE;

  760. 

  761. #ifdef TRACE

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

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

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

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

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

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

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

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

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

  771.            s->sample_rate);

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

  773.            s->bit_rate);

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

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

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

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

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

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

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

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

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

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

  784.            s->predictor_history);

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

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

  787.            s->multirate_inter);

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

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

  790.     av_log(s->avctx, AV_LOG_DEBUG,

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

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

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

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

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

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

  797. #endif

  798. 

  799.     /* Primary audio coding header */

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

  801. 

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

  803. }

  804. 

  805. 

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

  807. {

  808.     if (level < 5) {

  809.         /* huffman encoded */

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

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

  812.     } else if (level < 8) {

  813.         if (level + 1 > log2range) {

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

  815.             value = get_bits(gb, log2range);

  816.         } else {

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

  818.         }

  819.     }

  820.     return value;

  821. }

  822. 

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

  824. {

  825.     /* Primary audio coding side information */

  826.     int j, k;

  827. 

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

  829.         return AVERROR_INVALIDDATA;

  830. 

  831.     if (!base_channel) {

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

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

  834.     }

  835. 

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

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

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

  839.     }

  840. 

  841.     /* Get prediction codebook */

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

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

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

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

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

  847.             }

  848.         }

  849.     }

  850. 

  851.     /* Bit allocation index */

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

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

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

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

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

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

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

  859.                 av_log(s->avctx, AV_LOG_ERROR,

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

  861.                 return AVERROR_INVALIDDATA;

  862.             } else {

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

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

  865.             }

  866. 

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

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

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

  870.                 return AVERROR_INVALIDDATA;

  871.             }

  872.         }

  873.     }

  874. 

  875.     /* Transition mode */

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

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

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

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

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

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

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

  883.             }

  884.         }

  885.     }

  886. 

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

  888.         return AVERROR_INVALIDDATA;

  889. 

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

  891.         const uint32_t *scale_table;

  892.         int scale_sum, log_size;

  893. 

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

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

  896. 

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

  898.             scale_table = scale_factor_quant7;

  899.             log_size = 7;

  900.         } else {

  901.             scale_table = scale_factor_quant6;

  902.             log_size = 6;

  903.         }

  904. 

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

  906.         scale_sum = 0;

  907. 

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

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

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

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

  912.             }

  913. 

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

  915.                 /* Get second scale factor */

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

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

  918.             }

  919.         }

  920.     }

  921. 

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

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

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

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

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

  927.     }

  928. 

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

  930.         return AVERROR_INVALIDDATA;

  931. 

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

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

  934.         int source_channel;

  935. 

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

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

  938.             int scale = 0;

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

  940. 

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

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

  943. 

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

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

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

  947.             }

  948. 

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

  950.                 av_log(s->avctx, AV_LOG_DEBUG,

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

  952.                 s->debug_flag |= 0x02;

  953.             }

  954.         }

  955.     }

  956. 

  957.     /* Stereo downmix coefficients */

  958.     if (!base_channel && s->prim_channels > 2) {

  959.         if (s->downmix) {

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

  961.                 s->downmix_coef[j][0] = get_bits(&s->gb, 7);

  962.                 s->downmix_coef[j][1] = get_bits(&s->gb, 7);

  963.             }

  964.         } else {

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

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

  967.                 av_log(s->avctx, AV_LOG_ERROR,

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

  969.                 return AVERROR_INVALIDDATA;

  970.             }

  971.             if (s->prim_channels > FF_ARRAY_ELEMS(dca_default_coeffs[0])) {

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

  973.                                       s->prim_channels);

  974.                 return AVERROR_PATCHWELCOME;

  975.             }

  976. 

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

  978.                 s->downmix_coef[j][0] = dca_default_coeffs[am][j][0];

  979.                 s->downmix_coef[j][1] = dca_default_coeffs[am][j][1];

  980.             }

  981.         }

  982.     }

  983. 

  984.     /* Dynamic range coefficient */

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

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

  987. 

  988.     /* Side information CRC check word */

  989.     if (s->crc_present) {

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

  991.     }

  992. 

  993.     /*

  994.      * Primary audio data arrays

  995.      */

  996. 

  997.     /* VQ encoded high frequency subbands */

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

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

  1000.             /* 1 vector -> 32 samples */

  1001.             s->high_freq_vq[j][k] = get_bits(&s->gb, 10);

  1002. 

  1003.     /* Low frequency effect data */

  1004.     if (!base_channel && s->lfe) {

  1005.         int quant7;

  1006.         /* LFE samples */

  1007.         int lfe_samples = 2 * s->lfe * (4 + block_index);

  1008.         int lfe_end_sample = 2 * s->lfe * (4 + block_index + s->subsubframes[s->current_subframe]);

  1009.         float lfe_scale;

  1010. 

  1011.         for (j = lfe_samples; j < lfe_end_sample; j++) {

  1012.             /* Signed 8 bits int */

  1013.             s->lfe_data[j] = get_sbits(&s->gb, 8);

  1014.         }

  1015. 

  1016.         /* Scale factor index */

  1017.         quant7 = get_bits(&s->gb, 8);

  1018.         if (quant7 > 127) {

  1019.             avpriv_request_sample(s->avctx, "LFEScaleIndex larger than 127");

  1020.             return AVERROR_INVALIDDATA;

  1021.         }

  1022.         s->lfe_scale_factor = scale_factor_quant7[quant7];

  1023. 

  1024.         /* Quantization step size * scale factor */

  1025.         lfe_scale = 0.035 * s->lfe_scale_factor;

  1026. 

  1027.         for (j = lfe_samples; j < lfe_end_sample; j++)

  1028.             s->lfe_data[j] *= lfe_scale;

  1029.     }

  1030. 

  1031. #ifdef TRACE

  1032.     av_log(s->avctx, AV_LOG_DEBUG, "subsubframes: %i\n",

  1033.            s->subsubframes[s->current_subframe]);

  1034.     av_log(s->avctx, AV_LOG_DEBUG, "partial samples: %i\n",

  1035.            s->partial_samples[s->current_subframe]);

  1036. 

  1037.     for (j = base_channel; j < s->prim_channels; j++) {

  1038.         av_log(s->avctx, AV_LOG_DEBUG, "prediction mode:");

  1039.         for (k = 0; k < s->subband_activity[j]; k++)

  1040.             av_log(s->avctx, AV_LOG_DEBUG, " %i", s->prediction_mode[j][k]);

  1041.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1042.     }

  1043.     for (j = base_channel; j < s->prim_channels; j++) {

  1044.         for (k = 0; k < s->subband_activity[j]; k++)

  1045.             av_log(s->avctx, AV_LOG_DEBUG,

  1046.                    "prediction coefs: %f, %f, %f, %f\n",

  1047.                    (float) adpcm_vb[s->prediction_vq[j][k]][0] / 8192,

  1048.                    (float) adpcm_vb[s->prediction_vq[j][k]][1] / 8192,

  1049.                    (float) adpcm_vb[s->prediction_vq[j][k]][2] / 8192,

  1050.                    (float) adpcm_vb[s->prediction_vq[j][k]][3] / 8192);

  1051.     }

  1052.     for (j = base_channel; j < s->prim_channels; j++) {

  1053.         av_log(s->avctx, AV_LOG_DEBUG, "bitalloc index: ");

  1054.         for (k = 0; k < s->vq_start_subband[j]; k++)

  1055.             av_log(s->avctx, AV_LOG_DEBUG, "%2.2i ", s->bitalloc[j][k]);

  1056.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1057.     }

  1058.     for (j = base_channel; j < s->prim_channels; j++) {

  1059.         av_log(s->avctx, AV_LOG_DEBUG, "Transition mode:");

  1060.         for (k = 0; k < s->subband_activity[j]; k++)

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

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

  1063.     }

  1064.     for (j = base_channel; j < s->prim_channels; j++) {

  1065.         av_log(s->avctx, AV_LOG_DEBUG, "Scale factor:");

  1066.         for (k = 0; k < s->subband_activity[j]; k++) {

  1067.             if (k >= s->vq_start_subband[j] || s->bitalloc[j][k] > 0)

  1068.                 av_log(s->avctx, AV_LOG_DEBUG, " %i", s->scale_factor[j][k][0]);

  1069.             if (k < s->vq_start_subband[j] && s->transition_mode[j][k])

  1070.                 av_log(s->avctx, AV_LOG_DEBUG, " %i(t)", s->scale_factor[j][k][1]);

  1071.         }

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

  1073.     }

  1074.     for (j = base_channel; j < s->prim_channels; j++) {

  1075.         if (s->joint_intensity[j] > 0) {

  1076.             int source_channel = s->joint_intensity[j] - 1;

  1077.             av_log(s->avctx, AV_LOG_DEBUG, "Joint scale factor index:\n");

  1078.             for (k = s->subband_activity[j]; k < s->subband_activity[source_channel]; k++)

  1079.                 av_log(s->avctx, AV_LOG_DEBUG, " %i", s->joint_scale_factor[j][k]);

  1080.             av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1081.         }

  1082.     }

  1083.     if (!base_channel && s->prim_channels > 2 && s->downmix) {

  1084.         av_log(s->avctx, AV_LOG_DEBUG, "Downmix coeffs:\n");

  1085.         for (j = 0; j < s->prim_channels; j++) {

  1086.             av_log(s->avctx, AV_LOG_DEBUG, "Channel 0, %d = %f\n", j,

  1087.                    dca_downmix_coeffs[s->downmix_coef[j][0]]);

  1088.             av_log(s->avctx, AV_LOG_DEBUG, "Channel 1, %d = %f\n", j,

  1089.                    dca_downmix_coeffs[s->downmix_coef[j][1]]);

  1090.         }

  1091.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1092.     }

  1093.     for (j = base_channel; j < s->prim_channels; j++)

  1094.         for (k = s->vq_start_subband[j]; k < s->subband_activity[j]; k++)

  1095.             av_log(s->avctx, AV_LOG_DEBUG, "VQ index: %i\n", s->high_freq_vq[j][k]);

  1096.     if (!base_channel && s->lfe) {

  1097.         int lfe_samples = 2 * s->lfe * (4 + block_index);

  1098.         int lfe_end_sample = 2 * s->lfe * (4 + block_index + s->subsubframes[s->current_subframe]);

  1099. 

  1100.         av_log(s->avctx, AV_LOG_DEBUG, "LFE samples:\n");

  1101.         for (j = lfe_samples; j < lfe_end_sample; j++)

  1102.             av_log(s->avctx, AV_LOG_DEBUG, " %f", s->lfe_data[j]);

  1103.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1104.     }

  1105. #endif

  1106. 

  1107.     return 0;

  1108. }

  1109. 

  1110. static void qmf_32_subbands(DCAContext *s, int chans,

  1111.                             float samples_in[32][8], float *samples_out,

  1112.                             float scale)

  1113. {

  1114.     const float *prCoeff;

  1115. 

  1116.     int sb_act = s->subband_activity[chans];

  1117. 

  1118.     scale *= sqrt(1 / 8.0);

  1119. 

  1120.     /* Select filter */

  1121.     if (!s->multirate_inter)    /* Non-perfect reconstruction */

  1122.         prCoeff = fir_32bands_nonperfect;

  1123.     else                        /* Perfect reconstruction */

  1124.         prCoeff = fir_32bands_perfect;

  1125. 

  1126.     s->dcadsp.qmf_32_subbands(samples_in, sb_act, &s->synth, &s->imdct,

  1127.                               s->subband_fir_hist[chans],

  1128.                               &s->hist_index[chans],

  1129.                               s->subband_fir_noidea[chans], prCoeff,

  1130.                               samples_out, s->raXin, scale);

  1131. }

  1132. 

  1133. static void lfe_interpolation_fir(DCAContext *s, int decimation_select,

  1134.                                   int num_deci_sample, float *samples_in,

  1135.                                   float *samples_out, float scale)

  1136. {

  1137.     /* samples_in: An array holding decimated samples.

  1138.      *   Samples in current subframe starts from samples_in[0],

  1139.      *   while samples_in[-1], samples_in[-2], ..., stores samples

  1140.      *   from last subframe as history.

  1141.      *

  1142.      * samples_out: An array holding interpolated samples

  1143.      */

  1144. 

  1145.     int decifactor;

  1146.     const float *prCoeff;

  1147.     int deciindex;

  1148. 

  1149.     /* Select decimation filter */

  1150.     if (decimation_select == 1) {

  1151.         decifactor = 64;

  1152.         prCoeff = lfe_fir_128;

  1153.     } else {

  1154.         decifactor = 32;

  1155.         prCoeff = lfe_fir_64;

  1156.     }

  1157.     /* Interpolation */

  1158.     for (deciindex = 0; deciindex < num_deci_sample; deciindex++) {

  1159.         s->dcadsp.lfe_fir(samples_out, samples_in, prCoeff, decifactor, scale);

  1160.         samples_in++;

  1161.         samples_out += 2 * decifactor;

  1162.     }

  1163. }

  1164. 

  1165. /* downmixing routines */

  1166. #define MIX_REAR1(samples, s1, rs, coef)            \

  1167.     samples[0][i] += samples[s1][i] * coef[rs][0];  \

  1168.     samples[1][i] += samples[s1][i] * coef[rs][1];

  1169. 

  1170. #define MIX_REAR2(samples, s1, s2, rs, coef)                                          \

  1171.     samples[0][i] += samples[s1][i] * coef[rs][0] + samples[s2][i] * coef[rs + 1][0]; \

  1172.     samples[1][i] += samples[s1][i] * coef[rs][1] + samples[s2][i] * coef[rs + 1][1];

  1173. 

  1174. #define MIX_FRONT3(samples, coef)                                      \

  1175.     t = samples[c][i];                                                 \

  1176.     u = samples[l][i];                                                 \

  1177.     v = samples[r][i];                                                 \

  1178.     samples[0][i] = t * coef[0][0] + u * coef[1][0] + v * coef[2][0];  \

  1179.     samples[1][i] = t * coef[0][1] + u * coef[1][1] + v * coef[2][1];

  1180. 

  1181. #define DOWNMIX_TO_STEREO(op1, op2)             \

  1182.     for (i = 0; i < 256; i++) {                 \

  1183.         op1                                     \

  1184.         op2                                     \

  1185.     }

  1186. 

  1187. static void dca_downmix(float **samples, int srcfmt,

  1188.                         int downmix_coef[DCA_PRIM_CHANNELS_MAX][2],

  1189.                         const int8_t *channel_mapping)

  1190. {

  1191.     int c, l, r, sl, sr, s;

  1192.     int i;

  1193.     float t, u, v;

  1194.     float coef[DCA_PRIM_CHANNELS_MAX][2];

  1195. 

  1196.     for (i = 0; i < DCA_PRIM_CHANNELS_MAX; i++) {

  1197.         coef[i][0] = dca_downmix_coeffs[downmix_coef[i][0]];

  1198.         coef[i][1] = dca_downmix_coeffs[downmix_coef[i][1]];

  1199.     }

  1200. 

  1201.     switch (srcfmt) {

  1202.     case DCA_MONO:

  1203.     case DCA_CHANNEL:

  1204.     case DCA_STEREO_TOTAL:

  1205.     case DCA_STEREO_SUMDIFF:

  1206.     case DCA_4F2R:

  1207.         av_log(NULL, AV_LOG_ERROR, "Not implemented!\n");

  1208.         break;

  1209.     case DCA_STEREO:

  1210.         break;

  1211.     case DCA_3F:

  1212.         c = channel_mapping[0];

  1213.         l = channel_mapping[1];

  1214.         r = channel_mapping[2];

  1215.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef), );

  1216.         break;

  1217.     case DCA_2F1R:

  1218.         s = channel_mapping[2];

  1219.         DOWNMIX_TO_STEREO(MIX_REAR1(samples, s, 2, coef), );

  1220.         break;

  1221.     case DCA_3F1R:

  1222.         c = channel_mapping[0];

  1223.         l = channel_mapping[1];

  1224.         r = channel_mapping[2];

  1225.         s = channel_mapping[3];

  1226.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),

  1227.                           MIX_REAR1(samples, s, 3, coef));

  1228.         break;

  1229.     case DCA_2F2R:

  1230.         sl = channel_mapping[2];

  1231.         sr = channel_mapping[3];

  1232.         DOWNMIX_TO_STEREO(MIX_REAR2(samples, sl, sr, 2, coef), );

  1233.         break;

  1234.     case DCA_3F2R:

  1235.         c  = channel_mapping[0];

  1236.         l  = channel_mapping[1];

  1237.         r  = channel_mapping[2];

  1238.         sl = channel_mapping[3];

  1239.         sr = channel_mapping[4];

  1240.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),

  1241.                           MIX_REAR2(samples, sl, sr, 3, coef));

  1242.         break;

  1243.     }

  1244. }

  1245. 

  1246. 

  1247. #ifndef decode_blockcodes

  1248. /* Very compact version of the block code decoder that does not use table

  1249.  * look-up but is slightly slower */

  1250. static int decode_blockcode(int code, int levels, int32_t *values)

  1251. {

  1252.     int i;

  1253.     int offset = (levels - 1) >> 1;

  1254. 

  1255.     for (i = 0; i < 4; i++) {

  1256.         int div = FASTDIV(code, levels);

  1257.         values[i] = code - offset - div * levels;

  1258.         code = div;

  1259.     }

  1260. 

  1261.     return code;

  1262. }

  1263. 

  1264. static int decode_blockcodes(int code1, int code2, int levels, int32_t *values)

  1265. {

  1266.     return decode_blockcode(code1, levels, values) |

  1267.            decode_blockcode(code2, levels, values + 4);

  1268. }

  1269. #endif

  1270. 

  1271. static const uint8_t abits_sizes[7]  = { 7, 10, 12, 13, 15, 17, 19 };

  1272. static const uint8_t abits_levels[7] = { 3,  5,  7,  9, 13, 17, 25 };

  1273. 

  1274. #ifndef int8x8_fmul_int32

  1275. static inline void int8x8_fmul_int32(float *dst, const int8_t *src, int scale)

  1276. {

  1277.     float fscale = scale / 16.0;

  1278.     int i;

  1279.     for (i = 0; i < 8; i++)

  1280.         dst[i] = src[i] * fscale;

  1281. }

  1282. #endif

  1283. 

  1284. static int dca_subsubframe(DCAContext *s, int base_channel, int block_index)

  1285. {

  1286.     int k, l;

  1287.     int subsubframe = s->current_subsubframe;

  1288. 

  1289.     const float *quant_step_table;

  1290. 

  1291.     /* FIXME */

  1292.     float (*subband_samples)[DCA_SUBBANDS][8] = s->subband_samples[block_index];

  1293.     LOCAL_ALIGNED_16(int32_t, block, [8 * DCA_SUBBANDS]);

  1294. 

  1295.     /*

  1296.      * Audio data

  1297.      */

  1298. 

  1299.     /* Select quantization step size table */

  1300.     if (s->bit_rate_index == 0x1f)

  1301.         quant_step_table = lossless_quant_d;

  1302.     else

  1303.         quant_step_table = lossy_quant_d;

  1304. 

  1305.     for (k = base_channel; k < s->prim_channels; k++) {

  1306.         float rscale[DCA_SUBBANDS];

  1307. 

  1308.         if (get_bits_left(&s->gb) < 0)

  1309.             return AVERROR_INVALIDDATA;

  1310. 

  1311.         for (l = 0; l < s->vq_start_subband[k]; l++) {

  1312.             int m;

  1313. 

  1314.             /* Select the mid-tread linear quantizer */

  1315.             int abits = s->bitalloc[k][l];

  1316. 

  1317.             float quant_step_size = quant_step_table[abits];

  1318. 

  1319.             /*

  1320.              * Determine quantization index code book and its type

  1321.              */

  1322. 

  1323.             /* Select quantization index code book */

  1324.             int sel = s->quant_index_huffman[k][abits];

  1325. 

  1326.             /*

  1327.              * Extract bits from the bit stream

  1328.              */

  1329.             if (!abits) {

  1330.                 rscale[l] = 0;

  1331.                 memset(block + 8 * l, 0, 8 * sizeof(block[0]));

  1332.             } else {

  1333.                 /* Deal with transients */

  1334.                 int sfi = s->transition_mode[k][l] && subsubframe >= s->transition_mode[k][l];

  1335.                 rscale[l] = quant_step_size * s->scale_factor[k][l][sfi] *

  1336.                                s->scalefactor_adj[k][sel];

  1337. 

  1338.                 if (abits >= 11 || !dca_smpl_bitalloc[abits].vlc[sel].table) {

  1339.                     if (abits <= 7) {

  1340.                         /* Block code */

  1341.                         int block_code1, block_code2, size, levels, err;

  1342. 

  1343.                         size   = abits_sizes[abits - 1];

  1344.                         levels = abits_levels[abits - 1];

  1345. 

  1346.                         block_code1 = get_bits(&s->gb, size);

  1347.                         block_code2 = get_bits(&s->gb, size);

  1348.                         err = decode_blockcodes(block_code1, block_code2,

  1349.                                                 levels, block + 8 * l);

  1350.                         if (err) {

  1351.                             av_log(s->avctx, AV_LOG_ERROR,

  1352.                                    "ERROR: block code look-up failed\n");

  1353.                             return AVERROR_INVALIDDATA;

  1354.                         }

  1355.                     } else {

  1356.                         /* no coding */

  1357.                         for (m = 0; m < 8; m++)

  1358.                             block[8 * l + m] = get_sbits(&s->gb, abits - 3);

  1359.                     }

  1360.                 } else {

  1361.                     /* Huffman coded */

  1362.                     for (m = 0; m < 8; m++)

  1363.                         block[8 * l + m] = get_bitalloc(&s->gb,

  1364.                                                 &dca_smpl_bitalloc[abits], sel);

  1365.                 }

  1366. 

  1367.             }

  1368.         }

  1369. 

  1370.         s->fmt_conv.int32_to_float_fmul_array8(&s->fmt_conv, subband_samples[k][0],

  1371.                                                block, rscale, 8 * s->vq_start_subband[k]);

  1372. 

  1373.         for (l = 0; l < s->vq_start_subband[k]; l++) {

  1374.             int m;

  1375.             /*

  1376.              * Inverse ADPCM if in prediction mode

  1377.              */

  1378.             if (s->prediction_mode[k][l]) {

  1379.                 int n;

  1380.                 for (m = 0; m < 8; m++) {

  1381.                     for (n = 1; n <= 4; n++)

  1382.                         if (m >= n)

  1383.                             subband_samples[k][l][m] +=

  1384.                                 (adpcm_vb[s->prediction_vq[k][l]][n - 1] *

  1385.                                  subband_samples[k][l][m - n] / 8192);

  1386.                         else if (s->predictor_history)

  1387.                             subband_samples[k][l][m] +=

  1388.                                 (adpcm_vb[s->prediction_vq[k][l]][n - 1] *

  1389.                                  s->subband_samples_hist[k][l][m - n + 4] / 8192);

  1390.                 }

  1391.             }

  1392.         }

  1393. 

  1394.         /*

  1395.          * Decode VQ encoded high frequencies

  1396.          */

  1397.         for (l = s->vq_start_subband[k]; l < s->subband_activity[k]; l++) {

  1398.             /* 1 vector -> 32 samples but we only need the 8 samples

  1399.              * for this subsubframe. */

  1400.             int hfvq = s->high_freq_vq[k][l];

  1401. 

  1402.             if (!s->debug_flag & 0x01) {

  1403.                 av_log(s->avctx, AV_LOG_DEBUG,

  1404.                        "Stream with high frequencies VQ coding\n");

  1405.                 s->debug_flag |= 0x01;

  1406.             }

  1407. 

  1408.             int8x8_fmul_int32(subband_samples[k][l],

  1409.                               &high_freq_vq[hfvq][subsubframe * 8],

  1410.                               s->scale_factor[k][l][0]);

  1411.         }

  1412.     }

  1413. 

  1414.     /* Check for DSYNC after subsubframe */

  1415.     if (s->aspf || subsubframe == s->subsubframes[s->current_subframe] - 1) {

  1416.         if (0xFFFF == get_bits(&s->gb, 16)) {   /* 0xFFFF */

  1417. #ifdef TRACE

  1418.             av_log(s->avctx, AV_LOG_DEBUG, "Got subframe DSYNC\n");

  1419. #endif

  1420.         } else {

  1421.             av_log(s->avctx, AV_LOG_ERROR, "Didn't get subframe DSYNC\n");

  1422.             return AVERROR_INVALIDDATA;

  1423.         }

  1424.     }

  1425. 

  1426.     /* Backup predictor history for adpcm */

  1427.     for (k = base_channel; k < s->prim_channels; k++)

  1428.         for (l = 0; l < s->vq_start_subband[k]; l++)

  1429.             memcpy(s->subband_samples_hist[k][l],

  1430.                    &subband_samples[k][l][4],

  1431.                    4 * sizeof(subband_samples[0][0][0]));

  1432. 

  1433.     return 0;

  1434. }

  1435. 

  1436. static int dca_filter_channels(DCAContext *s, int block_index)

  1437. {

  1438.     float (*subband_samples)[DCA_SUBBANDS][8] = s->subband_samples[block_index];

  1439.     int k;

  1440. 

  1441.     /* 32 subbands QMF */

  1442.     for (k = 0; k < s->prim_channels; k++) {

  1443. /*        static float pcm_to_double[8] = { 32768.0, 32768.0, 524288.0, 524288.0,

  1444.                                             0, 8388608.0, 8388608.0 };*/

  1445.         if (s->channel_order_tab[k] >= 0)

  1446.             qmf_32_subbands(s, k, subband_samples[k],

  1447.                             s->samples_chanptr[s->channel_order_tab[k]],

  1448.                             M_SQRT1_2 / 32768.0 /* pcm_to_double[s->source_pcm_res] */);

  1449.     }

  1450. 

  1451.     /* Down mixing */

  1452.     if (s->avctx->request_channels == 2 && s->prim_channels > 2) {

  1453.         dca_downmix(s->samples_chanptr, s->amode, s->downmix_coef, s->channel_order_tab);

  1454.     }

  1455. 

  1456.     /* Generate LFE samples for this subsubframe FIXME!!! */

  1457.     if (s->output & DCA_LFE) {

  1458.         lfe_interpolation_fir(s, s->lfe, 2 * s->lfe,

  1459.                               s->lfe_data + 2 * s->lfe * (block_index + 4),

  1460.                               s->samples_chanptr[s->lfe_index],

  1461.                               1.0 / (256.0 * 32768.0));

  1462.         /* Outputs 20bits pcm samples */

  1463.     }

  1464. 

  1465.     return 0;

  1466. }

  1467. 

  1468. 

  1469. static int dca_subframe_footer(DCAContext *s, int base_channel)

  1470. {

  1471.     int aux_data_count = 0, i;

  1472. 

  1473.     /*

  1474.      * Unpack optional information

  1475.      */

  1476. 

  1477.     /* presumably optional information only appears in the core? */

  1478.     if (!base_channel) {

  1479.         if (s->timestamp)

  1480.             skip_bits_long(&s->gb, 32);

  1481. 

  1482.         if (s->aux_data)

  1483.             aux_data_count = get_bits(&s->gb, 6);

  1484. 

  1485.         for (i = 0; i < aux_data_count; i++)

  1486.             get_bits(&s->gb, 8);

  1487. 

  1488.         if (s->crc_present && (s->downmix || s->dynrange))

  1489.             get_bits(&s->gb, 16);

  1490.     }

  1491. 

  1492.     return 0;

  1493. }

  1494. 

  1495. /**

  1496.  * Decode a dca frame block

  1497.  *

  1498.  * @param s     pointer to the DCAContext

  1499.  */

  1500. 

  1501. static int dca_decode_block(DCAContext *s, int base_channel, int block_index)

  1502. {

  1503.     int ret;

  1504. 

  1505.     /* Sanity check */

  1506.     if (s->current_subframe >= s->subframes) {

  1507.         av_log(s->avctx, AV_LOG_DEBUG, "check failed: %i>%i",

  1508.                s->current_subframe, s->subframes);

  1509.         return AVERROR_INVALIDDATA;

  1510.     }

  1511. 

  1512.     if (!s->current_subsubframe) {

  1513. #ifdef TRACE

  1514.         av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subframe_header\n");

  1515. #endif

  1516.         /* Read subframe header */

  1517.         if ((ret = dca_subframe_header(s, base_channel, block_index)))

  1518.             return ret;

  1519.     }

  1520. 

  1521.     /* Read subsubframe */

  1522. #ifdef TRACE

  1523.     av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subsubframe\n");

  1524. #endif

  1525.     if ((ret = dca_subsubframe(s, base_channel, block_index)))

  1526.         return ret;

  1527. 

  1528.     /* Update state */

  1529.     s->current_subsubframe++;

  1530.     if (s->current_subsubframe >= s->subsubframes[s->current_subframe]) {

  1531.         s->current_subsubframe = 0;

  1532.         s->current_subframe++;

  1533.     }

  1534.     if (s->current_subframe >= s->subframes) {

  1535. #ifdef TRACE

  1536.         av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subframe_footer\n");

  1537. #endif

  1538.         /* Read subframe footer */

  1539.         if ((ret = dca_subframe_footer(s, base_channel)))

  1540.             return ret;

  1541.     }

  1542. 

  1543.     return 0;

  1544. }

  1545. 

  1546. /**

  1547.  * Return the number of channels in an ExSS speaker mask (HD)

  1548.  */

  1549. static int dca_exss_mask2count(int mask)

  1550. {

  1551.     /* count bits that mean speaker pairs twice */

  1552.     return av_popcount(mask) +

  1553.            av_popcount(mask & (DCA_EXSS_CENTER_LEFT_RIGHT      |

  1554.                                DCA_EXSS_FRONT_LEFT_RIGHT       |

  1555.                                DCA_EXSS_FRONT_HIGH_LEFT_RIGHT  |

  1556.                                DCA_EXSS_WIDE_LEFT_RIGHT        |

  1557.                                DCA_EXSS_SIDE_LEFT_RIGHT        |

  1558.                                DCA_EXSS_SIDE_HIGH_LEFT_RIGHT   |

  1559.                                DCA_EXSS_SIDE_REAR_LEFT_RIGHT   |

  1560.                                DCA_EXSS_REAR_LEFT_RIGHT        |

  1561.                                DCA_EXSS_REAR_HIGH_LEFT_RIGHT));

  1562. }

  1563. 

  1564. /**

  1565.  * Skip mixing coefficients of a single mix out configuration (HD)

  1566.  */

  1567. static void dca_exss_skip_mix_coeffs(GetBitContext *gb, int channels, int out_ch)

  1568. {

  1569.     int i;

  1570. 

  1571.     for (i = 0; i < channels; i++) {

  1572.         int mix_map_mask = get_bits(gb, out_ch);

  1573.         int num_coeffs = av_popcount(mix_map_mask);

  1574.         skip_bits_long(gb, num_coeffs * 6);

  1575.     }

  1576. }

  1577. 

  1578. /**

  1579.  * Parse extension substream asset header (HD)

  1580.  */

  1581. static int dca_exss_parse_asset_header(DCAContext *s)

  1582. {

  1583.     int header_pos = get_bits_count(&s->gb);

  1584.     int header_size;

  1585.     int channels = 0;

  1586.     int embedded_stereo = 0;

  1587.     int embedded_6ch    = 0;

  1588.     int drc_code_present;

  1589.     int av_uninit(extensions_mask);

  1590.     int i, j;

  1591. 

  1592.     if (get_bits_left(&s->gb) < 16)

  1593.         return -1;

  1594. 

  1595.     /* We will parse just enough to get to the extensions bitmask with which

  1596.      * we can set the profile value. */

  1597. 

  1598.     header_size = get_bits(&s->gb, 9) + 1;

  1599.     skip_bits(&s->gb, 3); // asset index

  1600. 

  1601.     if (s->static_fields) {

  1602.         if (get_bits1(&s->gb))

  1603.             skip_bits(&s->gb, 4); // asset type descriptor

  1604.         if (get_bits1(&s->gb))

  1605.             skip_bits_long(&s->gb, 24); // language descriptor

  1606. 

  1607.         if (get_bits1(&s->gb)) {

  1608.             /* How can one fit 1024 bytes of text here if the maximum value

  1609.              * for the asset header size field above was 512 bytes? */

  1610.             int text_length = get_bits(&s->gb, 10) + 1;

  1611.             if (get_bits_left(&s->gb) < text_length * 8)

  1612.                 return -1;

  1613.             skip_bits_long(&s->gb, text_length * 8); // info text

  1614.         }

  1615. 

  1616.         skip_bits(&s->gb, 5); // bit resolution - 1

  1617.         skip_bits(&s->gb, 4); // max sample rate code

  1618.         channels = get_bits(&s->gb, 8) + 1;

  1619. 

  1620.         if (get_bits1(&s->gb)) { // 1-to-1 channels to speakers

  1621.             int spkr_remap_sets;

  1622.             int spkr_mask_size = 16;

  1623.             int num_spkrs[7];

  1624. 

  1625.             if (channels > 2)

  1626.                 embedded_stereo = get_bits1(&s->gb);

  1627.             if (channels > 6)

  1628.                 embedded_6ch = get_bits1(&s->gb);

  1629. 

  1630.             if (get_bits1(&s->gb)) {

  1631.                 spkr_mask_size = (get_bits(&s->gb, 2) + 1) << 2;

  1632.                 skip_bits(&s->gb, spkr_mask_size); // spkr activity mask

  1633.             }

  1634. 

  1635.             spkr_remap_sets = get_bits(&s->gb, 3);

  1636. 

  1637.             for (i = 0; i < spkr_remap_sets; i++) {

  1638.                 /* std layout mask for each remap set */

  1639.                 num_spkrs[i] = dca_exss_mask2count(get_bits(&s->gb, spkr_mask_size));

  1640.             }

  1641. 

  1642.             for (i = 0; i < spkr_remap_sets; i++) {

  1643.                 int num_dec_ch_remaps = get_bits(&s->gb, 5) + 1;

  1644.                 if (get_bits_left(&s->gb) < 0)

  1645.                     return -1;

  1646. 

  1647.                 for (j = 0; j < num_spkrs[i]; j++) {

  1648.                     int remap_dec_ch_mask = get_bits_long(&s->gb, num_dec_ch_remaps);

  1649.                     int num_dec_ch = av_popcount(remap_dec_ch_mask);

  1650.                     skip_bits_long(&s->gb, num_dec_ch * 5); // remap codes

  1651.                 }

  1652.             }

  1653. 

  1654.         } else {

  1655.             skip_bits(&s->gb, 3); // representation type

  1656.         }

  1657.     }

  1658. 

  1659.     drc_code_present = get_bits1(&s->gb);

  1660.     if (drc_code_present)

  1661.         get_bits(&s->gb, 8); // drc code

  1662. 

  1663.     if (get_bits1(&s->gb))

  1664.         skip_bits(&s->gb, 5); // dialog normalization code

  1665. 

  1666.     if (drc_code_present && embedded_stereo)

  1667.         get_bits(&s->gb, 8); // drc stereo code

  1668. 

  1669.     if (s->mix_metadata && get_bits1(&s->gb)) {

  1670.         skip_bits(&s->gb, 1); // external mix

  1671.         skip_bits(&s->gb, 6); // post mix gain code

  1672. 

  1673.         if (get_bits(&s->gb, 2) != 3) // mixer drc code

  1674.             skip_bits(&s->gb, 3); // drc limit

  1675.         else

  1676.             skip_bits(&s->gb, 8); // custom drc code

  1677. 

  1678.         if (get_bits1(&s->gb)) // channel specific scaling

  1679.             for (i = 0; i < s->num_mix_configs; i++)

  1680.                 skip_bits_long(&s->gb, s->mix_config_num_ch[i] * 6); // scale codes

  1681.         else

  1682.             skip_bits_long(&s->gb, s->num_mix_configs * 6); // scale codes

  1683. 

  1684.         for (i = 0; i < s->num_mix_configs; i++) {

  1685.             if (get_bits_left(&s->gb) < 0)

  1686.                 return -1;

  1687.             dca_exss_skip_mix_coeffs(&s->gb, channels, s->mix_config_num_ch[i]);

  1688.             if (embedded_6ch)

  1689.                 dca_exss_skip_mix_coeffs(&s->gb, 6, s->mix_config_num_ch[i]);

  1690.             if (embedded_stereo)

  1691.                 dca_exss_skip_mix_coeffs(&s->gb, 2, s->mix_config_num_ch[i]);

  1692.         }

  1693.     }

  1694. 

  1695.     switch (get_bits(&s->gb, 2)) {

  1696.     case 0: extensions_mask = get_bits(&s->gb, 12); break;

  1697.     case 1: extensions_mask = DCA_EXT_EXSS_XLL;     break;

  1698.     case 2: extensions_mask = DCA_EXT_EXSS_LBR;     break;

  1699.     case 3: extensions_mask = 0; /* aux coding */   break;

  1700.     }

  1701. 

  1702.     /* not parsed further, we were only interested in the extensions mask */

  1703. 

  1704.     if (get_bits_left(&s->gb) < 0)

  1705.         return -1;

  1706. 

  1707.     if (get_bits_count(&s->gb) - header_pos > header_size * 8) {

  1708.         av_log(s->avctx, AV_LOG_WARNING, "Asset header size mismatch.\n");

  1709.         return -1;

  1710.     }

  1711.     skip_bits_long(&s->gb, header_pos + header_size * 8 - get_bits_count(&s->gb));

  1712. 

  1713.     if (extensions_mask & DCA_EXT_EXSS_XLL)

  1714.         s->profile = FF_PROFILE_DTS_HD_MA;

  1715.     else if (extensions_mask & (DCA_EXT_EXSS_XBR | DCA_EXT_EXSS_X96 |

  1716.                                 DCA_EXT_EXSS_XXCH))

  1717.         s->profile = FF_PROFILE_DTS_HD_HRA;

  1718. 

  1719.     if (!(extensions_mask & DCA_EXT_CORE))

  1720.         av_log(s->avctx, AV_LOG_WARNING, "DTS core detection mismatch.\n");

  1721.     if ((extensions_mask & DCA_CORE_EXTS) != s->core_ext_mask)

  1722.         av_log(s->avctx, AV_LOG_WARNING,

  1723.                "DTS extensions detection mismatch (%d, %d)\n",

  1724.                extensions_mask & DCA_CORE_EXTS, s->core_ext_mask);

  1725. 

  1726.     return 0;

  1727. }

  1728. 

  1729. static int dca_xbr_parse_frame(DCAContext *s)

  1730. {

  1731.     int scale_table_high[DCA_CHSET_CHANS_MAX][DCA_SUBBANDS][2];

  1732.     int active_bands[DCA_CHSETS_MAX][DCA_CHSET_CHANS_MAX];

  1733.     int abits_high[DCA_CHSET_CHANS_MAX][DCA_SUBBANDS];

  1734.     int anctemp[DCA_CHSET_CHANS_MAX];

  1735.     int chset_fsize[DCA_CHSETS_MAX];

  1736.     int n_xbr_ch[DCA_CHSETS_MAX];

  1737.     int hdr_size, num_chsets, xbr_tmode, hdr_pos;

  1738.     int i, j, k, l, chset, chan_base;

  1739. 

  1740.     av_log(s->avctx, AV_LOG_DEBUG, "DTS-XBR: decoding XBR extension\n");

  1741. 

  1742.     /* get bit position of sync header */

  1743.     hdr_pos = get_bits_count(&s->gb) - 32;

  1744. 

  1745.     hdr_size = get_bits(&s->gb, 6) + 1;

  1746.     num_chsets = get_bits(&s->gb, 2) + 1;

  1747. 

  1748.     for(i = 0; i < num_chsets; i++)

  1749.         chset_fsize[i] = get_bits(&s->gb, 14) + 1;

  1750. 

  1751.     xbr_tmode = get_bits1(&s->gb);

  1752. 

  1753.     for(i = 0; i < num_chsets; i++) {

  1754.         n_xbr_ch[i] = get_bits(&s->gb, 3) + 1;

  1755.         k = get_bits(&s->gb, 2) + 5;

  1756.         for(j = 0; j < n_xbr_ch[i]; j++)

  1757.             active_bands[i][j] = get_bits(&s->gb, k) + 1;

  1758.     }

  1759. 

  1760.     /* skip to the end of the header */

  1761.     i = get_bits_count(&s->gb);

  1762.     if(hdr_pos + hdr_size * 8 > i)

  1763.         skip_bits_long(&s->gb, hdr_pos + hdr_size * 8 - i);

  1764. 

  1765.     /* loop over the channel data sets */

  1766.     /* only decode as many channels as we've decoded base data for */

  1767.     for(chset = 0, chan_base = 0;

  1768.         chset < num_chsets && chan_base + n_xbr_ch[chset] <= s->prim_channels;

  1769.         chan_base += n_xbr_ch[chset++]) {

  1770.         int start_posn = get_bits_count(&s->gb);

  1771.         int subsubframe = 0;

  1772.         int subframe = 0;

  1773. 

  1774.         /* loop over subframes */

  1775.         for (k = 0; k < (s->sample_blocks / 8); k++) {

  1776.             /* parse header if we're on first subsubframe of a block */

  1777.             if(subsubframe == 0) {

  1778.                 /* Parse subframe header */

  1779.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1780.                     anctemp[i] = get_bits(&s->gb, 2) + 2;

  1781.                 }

  1782. 

  1783.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1784.                     get_array(&s->gb, abits_high[i], active_bands[chset][i], anctemp[i]);

  1785.                 }

  1786. 

  1787.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1788.                     anctemp[i] = get_bits(&s->gb, 3);

  1789.                     if(anctemp[i] < 1) {

  1790.                         av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: SYNC ERROR\n");

  1791.                         return AVERROR_INVALIDDATA;

  1792.                     }

  1793.                 }

  1794. 

  1795.                 /* generate scale factors */

  1796.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1797.                     const uint32_t *scale_table;

  1798.                     int nbits;

  1799. 

  1800.                     if (s->scalefactor_huffman[chan_base+i] == 6) {

  1801.                         scale_table = scale_factor_quant7;

  1802.                     } else {

  1803.                         scale_table = scale_factor_quant6;

  1804.                     }

  1805. 

  1806.                     nbits = anctemp[i];

  1807. 

  1808.                     for(j = 0; j < active_bands[chset][i]; j++) {

  1809.                         if(abits_high[i][j] > 0) {

  1810.                             scale_table_high[i][j][0] =

  1811.                                 scale_table[get_bits(&s->gb, nbits)];

  1812. 

  1813.                             if(xbr_tmode && s->transition_mode[i][j]) {

  1814.                                 scale_table_high[i][j][1] =

  1815.                                     scale_table[get_bits(&s->gb, nbits)];

  1816.                             }

  1817.                         }

  1818.                     }

  1819.                 }

  1820.             }

  1821. 

  1822.             /* decode audio array for this block */

  1823.             for(i = 0; i < n_xbr_ch[chset]; i++) {

  1824.                 for(j = 0; j < active_bands[chset][i]; j++) {

  1825.                     const int xbr_abits = abits_high[i][j];

  1826.                     const float quant_step_size = lossless_quant_d[xbr_abits];

  1827.                     const int sfi = xbr_tmode && s->transition_mode[i][j] && subsubframe >= s->transition_mode[i][j];

  1828.                     const float rscale = quant_step_size * scale_table_high[i][j][sfi];

  1829.                     float *subband_samples = s->subband_samples[k][chan_base+i][j];

  1830.                     int block[8];

  1831. 

  1832.                     if(xbr_abits <= 0)

  1833.                         continue;

  1834. 

  1835.                     if(xbr_abits > 7) {

  1836.                         get_array(&s->gb, block, 8, xbr_abits - 3);

  1837.                     } else {

  1838.                         int block_code1, block_code2, size, levels, err;

  1839. 

  1840.                         size   = abits_sizes[xbr_abits - 1];

  1841.                         levels = abits_levels[xbr_abits - 1];

  1842. 

  1843.                         block_code1 = get_bits(&s->gb, size);

  1844.                         block_code2 = get_bits(&s->gb, size);

  1845.                         err = decode_blockcodes(block_code1, block_code2,

  1846.                                                 levels, block);

  1847.                         if (err) {

  1848.                             av_log(s->avctx, AV_LOG_ERROR,

  1849.                                    "ERROR: DTS-XBR: block code look-up failed\n");

  1850.                             return AVERROR_INVALIDDATA;

  1851.                         }

  1852.                     }

  1853. 

  1854.                     /* scale & sum into subband */

  1855.                     for(l = 0; l < 8; l++)

  1856.                         subband_samples[l] += (float)block[l] * rscale;

  1857.                 }

  1858.             }

  1859. 

  1860.             /* check DSYNC marker */

  1861.             if(s->aspf || subsubframe == s->subsubframes[subframe] - 1) {

  1862.                 if(get_bits(&s->gb, 16) != 0xffff) {

  1863.                     av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: Didn't get subframe DSYNC\n");

  1864.                     return AVERROR_INVALIDDATA;

  1865.                 }

  1866.             }

  1867. 

  1868.             /* advance sub-sub-frame index */

  1869.             if(++subsubframe >= s->subsubframes[subframe]) {

  1870.                 subsubframe = 0;

  1871.                 subframe++;

  1872.             }

  1873.         }

  1874. 

  1875.         /* skip to next channel set */

  1876.         i = get_bits_count(&s->gb);

  1877.         if(start_posn + chset_fsize[chset] * 8 != i) {

  1878.             j = start_posn + chset_fsize[chset] * 8 - i;

  1879.             if(j < 0 || j >= 8)

  1880.                 av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: end of channel set,"

  1881.                        " skipping further than expected (%d bits)\n", j);

  1882.             skip_bits_long(&s->gb, j);

  1883.         }

  1884.     }

  1885. 

  1886.     return 0;

  1887. }

  1888. 

  1889. /* parse initial header for XXCH and dump details */

  1890. static int dca_xxch_decode_frame(DCAContext *s)

  1891. {

  1892.     int hdr_size, spkmsk_bits, num_chsets, core_spk, hdr_pos;

  1893.     int i, chset, base_channel, chstart, fsize[8];

  1894. 

  1895.     /* assume header word has already been parsed */

  1896.     hdr_pos     = get_bits_count(&s->gb) - 32;

  1897.     hdr_size    = get_bits(&s->gb, 6) + 1;

  1898.   /*chhdr_crc   =*/ skip_bits1(&s->gb);

  1899.     spkmsk_bits = get_bits(&s->gb, 5) + 1;

  1900.     num_chsets  = get_bits(&s->gb, 2) + 1;

  1901. 

  1902.     for (i = 0; i < num_chsets; i++)

  1903.         fsize[i] = get_bits(&s->gb, 14) + 1;

  1904. 

  1905.     core_spk               = get_bits(&s->gb, spkmsk_bits);

  1906.     s->xxch_core_spkmask   = core_spk;

  1907.     s->xxch_nbits_spk_mask = spkmsk_bits;

  1908.     s->xxch_dmix_embedded  = 0;

  1909. 

  1910.     /* skip to the end of the header */

  1911.     i = get_bits_count(&s->gb);

  1912.     if (hdr_pos + hdr_size * 8 > i)

  1913.         skip_bits_long(&s->gb, hdr_pos + hdr_size * 8 - i);

  1914. 

  1915.     for (chset = 0; chset < num_chsets; chset++) {

  1916.         chstart       = get_bits_count(&s->gb);

  1917.         base_channel  = s->prim_channels;

  1918.         s->xxch_chset = chset;

  1919. 

  1920.         /* XXCH and Core headers differ, see 6.4.2 "XXCH Channel Set Header" vs.

  1921.            5.3.2 "Primary Audio Coding Header", DTS Spec 1.3.1 */

  1922.         dca_parse_audio_coding_header(s, base_channel, 1);

  1923. 

  1924.         /* decode channel data */

  1925.         for (i = 0; i < (s->sample_blocks / 8); i++) {

  1926.             if (dca_decode_block(s, base_channel, i)) {

  1927.                 av_log(s->avctx, AV_LOG_ERROR,

  1928.                        "Error decoding DTS-XXCH extension\n");

  1929.                 continue;

  1930.             }

  1931.         }

  1932. 

  1933.         /* skip to end of this section */

  1934.         i = get_bits_count(&s->gb);

  1935.         if (chstart + fsize[chset] * 8 > i)

  1936.             skip_bits_long(&s->gb, chstart + fsize[chset] * 8 - i);

  1937.     }

  1938.     s->xxch_chset = num_chsets;

  1939. 

  1940.     return 0;

  1941. }

  1942. 

  1943. /**

  1944.  * Parse extension substream header (HD)

  1945.  */

  1946. static void dca_exss_parse_header(DCAContext *s)

  1947. {

  1948.     int asset_size[8];

  1949.     int ss_index;

  1950.     int blownup;

  1951.     int num_audiop = 1;

  1952.     int num_assets = 1;

  1953.     int active_ss_mask[8];

  1954.     int i, j;

  1955.     int start_posn;

  1956.     int hdrsize;

  1957.     uint32_t mkr;

  1958. 

  1959.     if (get_bits_left(&s->gb) < 52)

  1960.         return;

  1961. 

  1962.     start_posn = get_bits_count(&s->gb) - 32;

  1963. 

  1964.     skip_bits(&s->gb, 8); // user data

  1965.     ss_index = get_bits(&s->gb, 2);

  1966. 

  1967.     blownup = get_bits1(&s->gb);

  1968.     hdrsize = get_bits(&s->gb,  8 + 4 * blownup) + 1; // header_size

  1969.     skip_bits(&s->gb, 16 + 4 * blownup); // hd_size

  1970. 

  1971.     s->static_fields = get_bits1(&s->gb);

  1972.     if (s->static_fields) {

  1973.         skip_bits(&s->gb, 2); // reference clock code

  1974.         skip_bits(&s->gb, 3); // frame duration code

  1975. 

  1976.         if (get_bits1(&s->gb))

  1977.             skip_bits_long(&s->gb, 36); // timestamp

  1978. 

  1979.         /* a single stream can contain multiple audio assets that can be

  1980.          * combined to form multiple audio presentations */

  1981. 

  1982.         num_audiop = get_bits(&s->gb, 3) + 1;

  1983.         if (num_audiop > 1) {

  1984.             avpriv_request_sample(s->avctx,

  1985.                                   "Multiple DTS-HD audio presentations");

  1986.             /* ignore such streams for now */

  1987.             return;

  1988.         }

  1989. 

  1990.         num_assets = get_bits(&s->gb, 3) + 1;

  1991.         if (num_assets > 1) {

  1992.             avpriv_request_sample(s->avctx, "Multiple DTS-HD audio assets");

  1993.             /* ignore such streams for now */

  1994.             return;

  1995.         }

  1996. 

  1997.         for (i = 0; i < num_audiop; i++)

  1998.             active_ss_mask[i] = get_bits(&s->gb, ss_index + 1);

  1999. 

  2000.         for (i = 0; i < num_audiop; i++)

  2001.             for (j = 0; j <= ss_index; j++)

  2002.                 if (active_ss_mask[i] & (1 << j))

  2003.                     skip_bits(&s->gb, 8); // active asset mask

  2004. 

  2005.         s->mix_metadata = get_bits1(&s->gb);

  2006.         if (s->mix_metadata) {

  2007.             int mix_out_mask_size;

  2008. 

  2009.             skip_bits(&s->gb, 2); // adjustment level

  2010.             mix_out_mask_size  = (get_bits(&s->gb, 2) + 1) << 2;

  2011.             s->num_mix_configs =  get_bits(&s->gb, 2) + 1;

  2012. 

  2013.             for (i = 0; i < s->num_mix_configs; i++) {

  2014.                 int mix_out_mask        = get_bits(&s->gb, mix_out_mask_size);

  2015.                 s->mix_config_num_ch[i] = dca_exss_mask2count(mix_out_mask);

  2016.             }

  2017.         }

  2018.     }

  2019. 

  2020.     for (i = 0; i < num_assets; i++)

  2021.         asset_size[i] = get_bits_long(&s->gb, 16 + 4 * blownup);

  2022. 

  2023.     for (i = 0; i < num_assets; i++) {

  2024.         if (dca_exss_parse_asset_header(s))

  2025.             return;

  2026.     }

  2027. 

  2028.     /* not parsed further, we were only interested in the extensions mask

  2029.      * from the asset header */

  2030. 

  2031.     if (num_assets > 0) {

  2032.         j = get_bits_count(&s->gb);

  2033.         if (start_posn + hdrsize * 8 > j)

  2034.             skip_bits_long(&s->gb, start_posn + hdrsize * 8 - j);

  2035. 

  2036.         for (i = 0; i < num_assets; i++) {

  2037.             start_posn = get_bits_count(&s->gb);

  2038.             mkr        = get_bits_long(&s->gb, 32);

  2039. 

  2040.             /* parse extensions that we know about */

  2041.             if (mkr == 0x655e315e) {

  2042.                 dca_xbr_parse_frame(s);

  2043.             } else if (mkr == 0x47004a03) {

  2044.                 dca_xxch_decode_frame(s);

  2045.                 s->core_ext_mask |= DCA_EXT_XXCH; /* xxx use for chan reordering */

  2046.             } else {

  2047.                 av_log(s->avctx, AV_LOG_DEBUG,

  2048.                        "DTS-ExSS: unknown marker = 0x%08x\n", mkr);

  2049.             }

  2050. 

  2051.             /* skip to end of block */

  2052.             j = get_bits_count(&s->gb);

  2053.             if (start_posn + asset_size[i] * 8 > j)

  2054.                 skip_bits_long(&s->gb, start_posn + asset_size[i] * 8 - j);

  2055.         }

  2056.     }

  2057. }

  2058. 

  2059. /**

  2060.  * Main frame decoding function

  2061.  * FIXME add arguments

  2062.  */

  2063. static int dca_decode_frame(AVCodecContext *avctx, void *data,

  2064.                             int *got_frame_ptr, AVPacket *avpkt)

  2065. {

  2066.     AVFrame *frame     = data;

  2067.     const uint8_t *buf = avpkt->data;

  2068.     int buf_size = avpkt->size;

  2069.     int channel_mask;

  2070.     int channel_layout;

  2071.     int lfe_samples;

  2072.     int num_core_channels = 0;

  2073.     int i, ret;

  2074.     float **samples_flt;

  2075.     float *src_chan;

  2076.     float *dst_chan;

  2077.     DCAContext *s = avctx->priv_data;

  2078.     int core_ss_end;

  2079.     int channels, full_channels;

  2080.     float scale;

  2081.     int achan;

  2082.     int chset;

  2083.     int mask;

  2084.     int lavc;

  2085.     int posn;

  2086.     int j, k;

  2087.     int endch;

  2088. 

  2089.     s->xch_present = 0;

  2090. 

  2091.     s->dca_buffer_size = ff_dca_convert_bitstream(buf, buf_size, s->dca_buffer,

  2092.                                                   DCA_MAX_FRAME_SIZE + DCA_MAX_EXSS_HEADER_SIZE);

  2093.     if (s->dca_buffer_size == AVERROR_INVALIDDATA) {

  2094.         av_log(avctx, AV_LOG_ERROR, "Not a valid DCA frame\n");

  2095.         return AVERROR_INVALIDDATA;

  2096.     }

  2097. 

  2098.     init_get_bits(&s->gb, s->dca_buffer, s->dca_buffer_size * 8);

  2099.     if ((ret = dca_parse_frame_header(s)) < 0) {

  2100.         //seems like the frame is corrupt, try with the next one

  2101.         return ret;

  2102.     }

  2103.     //set AVCodec values with parsed data

  2104.     avctx->sample_rate = s->sample_rate;

  2105.     avctx->bit_rate    = s->bit_rate;

  2106. 

  2107.     s->profile = FF_PROFILE_DTS;

  2108. 

  2109.     for (i = 0; i < (s->sample_blocks / 8); i++) {

  2110.         if ((ret = dca_decode_block(s, 0, i))) {

  2111.             av_log(avctx, AV_LOG_ERROR, "error decoding block\n");

  2112.             return ret;

  2113.         }

  2114.     }

  2115. 

  2116.     /* record number of core channels incase less than max channels are requested */

  2117.     num_core_channels = s->prim_channels;

  2118. 

  2119.     if (s->ext_coding)

  2120.         s->core_ext_mask = dca_ext_audio_descr_mask[s->ext_descr];

  2121.     else

  2122.         s->core_ext_mask = 0;

  2123. 

  2124.     core_ss_end = FFMIN(s->frame_size, s->dca_buffer_size) * 8;

  2125. 

  2126.     /* only scan for extensions if ext_descr was unknown or indicated a

  2127.      * supported XCh extension */

  2128.     if (s->core_ext_mask < 0 || s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH)) {

  2129. 

  2130.         /* if ext_descr was unknown, clear s->core_ext_mask so that the

  2131.          * extensions scan can fill it up */

  2132.         s->core_ext_mask = FFMAX(s->core_ext_mask, 0);

  2133. 

  2134.         /* extensions start at 32-bit boundaries into bitstream */

  2135.         skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);

  2136. 

  2137.         while (core_ss_end - get_bits_count(&s->gb) >= 32) {

  2138.             uint32_t bits = get_bits_long(&s->gb, 32);

  2139. 

  2140.             switch (bits) {

  2141.             case 0x5a5a5a5a: {

  2142.                 int ext_amode, xch_fsize;

  2143. 

  2144.                 s->xch_base_channel = s->prim_channels;

  2145. 

  2146.                 /* validate sync word using XCHFSIZE field */

  2147.                 xch_fsize = show_bits(&s->gb, 10);

  2148.                 if ((s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize) &&

  2149.                     (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize + 1))

  2150.                     continue;

  2151. 

  2152.                 /* skip length-to-end-of-frame field for the moment */

  2153.                 skip_bits(&s->gb, 10);

  2154. 

  2155.                 s->core_ext_mask |= DCA_EXT_XCH;

  2156. 

  2157.                 /* extension amode(number of channels in extension) should be 1 */

  2158.                 /* AFAIK XCh is not used for more channels */

  2159.                 if ((ext_amode = get_bits(&s->gb, 4)) != 1) {

  2160.                     av_log(avctx, AV_LOG_ERROR, "XCh extension amode %d not"

  2161.                            " supported!\n", ext_amode);

  2162.                     continue;

  2163.                 }

  2164. 

  2165.                 if (s->xch_base_channel < 2) {

  2166.                     avpriv_request_sample(avctx, "XCh with fewer than 2 base channels");

  2167.                     continue;

  2168.                 }

  2169. 

  2170.                 /* much like core primary audio coding header */

  2171.                 dca_parse_audio_coding_header(s, s->xch_base_channel, 0);

  2172. 

  2173.                 for (i = 0; i < (s->sample_blocks / 8); i++)

  2174.                     if ((ret = dca_decode_block(s, s->xch_base_channel, i))) {

  2175.                         av_log(avctx, AV_LOG_ERROR, "error decoding XCh extension\n");

  2176.                         continue;

  2177.                     }

  2178. 

  2179.                 s->xch_present = 1;

  2180.                 break;

  2181.             }

  2182.             case 0x47004a03:

  2183.                 /* XXCh: extended channels */

  2184.                 /* usually found either in core or HD part in DTS-HD HRA streams,

  2185.                  * but not in DTS-ES which contains XCh extensions instead */

  2186.                 s->core_ext_mask |= DCA_EXT_XXCH;

  2187.                 dca_xxch_decode_frame(s);

  2188.                 break;

  2189. 

  2190.             case 0x1d95f262: {

  2191.                 int fsize96 = show_bits(&s->gb, 12) + 1;

  2192.                 if (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + fsize96)

  2193.                     continue;

  2194. 

  2195.                 av_log(avctx, AV_LOG_DEBUG, "X96 extension found at %d bits\n",

  2196.                        get_bits_count(&s->gb));

  2197.                 skip_bits(&s->gb, 12);

  2198.                 av_log(avctx, AV_LOG_DEBUG, "FSIZE96 = %d bytes\n", fsize96);

  2199.                 av_log(avctx, AV_LOG_DEBUG, "REVNO = %d\n", get_bits(&s->gb, 4));

  2200. 

  2201.                 s->core_ext_mask |= DCA_EXT_X96;

  2202.                 break;

  2203.             }

  2204.             }

  2205. 

  2206.             skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);

  2207.         }

  2208.     } else {

  2209.         /* no supported extensions, skip the rest of the core substream */

  2210.         skip_bits_long(&s->gb, core_ss_end - get_bits_count(&s->gb));

  2211.     }

  2212. 

  2213.     if (s->core_ext_mask & DCA_EXT_X96)

  2214.         s->profile = FF_PROFILE_DTS_96_24;

  2215.     else if (s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH))

  2216.         s->profile = FF_PROFILE_DTS_ES;

  2217. 

  2218.     /* check for ExSS (HD part) */

  2219.     if (s->dca_buffer_size - s->frame_size > 32 &&

  2220.         get_bits_long(&s->gb, 32) == DCA_HD_MARKER)

  2221.         dca_exss_parse_header(s);

  2222. 

  2223.     avctx->profile = s->profile;

  2224. 

  2225.     full_channels = channels = s->prim_channels + !!s->lfe;

  2226. 

  2227.     /* If we have XXCH then the channel layout is managed differently */

  2228.     /* note that XLL will also have another way to do things */

  2229.     if (!(s->core_ext_mask & DCA_EXT_XXCH)

  2230.         || (s->core_ext_mask & DCA_EXT_XXCH && avctx->request_channels > 0

  2231.             && avctx->request_channels

  2232.             < num_core_channels + !!s->lfe + s->xxch_chset_nch[0]))

  2233.     { /* xxx should also do MA extensions */

  2234.         if (s->amode < 16) {

  2235.             avctx->channel_layout = dca_core_channel_layout[s->amode];

  2236. 

  2237.             if (s->xch_present && (!avctx->request_channels ||

  2238.                                    avctx->request_channels

  2239.                                    > num_core_channels + !!s->lfe)) {

  2240.                 avctx->channel_layout |= AV_CH_BACK_CENTER;

  2241.                 if (s->lfe) {

  2242.                     avctx->channel_layout |= AV_CH_LOW_FREQUENCY;

  2243.                     s->channel_order_tab = dca_channel_reorder_lfe_xch[s->amode];

  2244.                 } else {

  2245.                     s->channel_order_tab = dca_channel_reorder_nolfe_xch[s->amode];

  2246.                 }

  2247.                 if (s->channel_order_tab[s->xch_base_channel] < 0)

  2248.                     return AVERROR_INVALIDDATA;

  2249.             } else {

  2250.                 channels = num_core_channels + !!s->lfe;

  2251.                 s->xch_present = 0; /* disable further xch processing */

  2252.                 if (s->lfe) {

  2253.                     avctx->channel_layout |= AV_CH_LOW_FREQUENCY;

  2254.                     s->channel_order_tab = dca_channel_reorder_lfe[s->amode];

  2255.                 } else

  2256.                     s->channel_order_tab = dca_channel_reorder_nolfe[s->amode];

  2257.             }

  2258. 

  2259.             if (channels > !!s->lfe &&

  2260.                 s->channel_order_tab[channels - 1 - !!s->lfe] < 0)

  2261.                 return AVERROR_INVALIDDATA;

  2262. 

  2263.             if (av_get_channel_layout_nb_channels(avctx->channel_layout) != channels) {

  2264.                 av_log(avctx, AV_LOG_ERROR, "Number of channels %d mismatches layout %d\n", channels, av_get_channel_layout_nb_channels(avctx->channel_layout));

  2265.                 return AVERROR_INVALIDDATA;

  2266.             }

  2267. 

  2268.             if (avctx->request_channels == 2 && s->prim_channels > 2) {

  2269.                 channels = 2;

  2270.                 s->output = DCA_STEREO;

  2271.                 avctx->channel_layout = AV_CH_LAYOUT_STEREO;

  2272.             }

  2273.             else if (avctx->request_channel_layout & AV_CH_LAYOUT_NATIVE) {

  2274.                 static const int8_t dca_channel_order_native[9] = { 0, 1, 2, 3, 4, 5, 6, 7, 8 };

  2275.                 s->channel_order_tab = dca_channel_order_native;

  2276.             }

  2277.             s->lfe_index = dca_lfe_index[s->amode];

  2278.         } else {

  2279.             av_log(avctx, AV_LOG_ERROR,

  2280.                    "Non standard configuration %d !\n", s->amode);

  2281.             return AVERROR_INVALIDDATA;

  2282.         }

  2283. 

  2284.         s->xxch_dmix_embedded = 0;

  2285.     } else {

  2286.         /* we only get here if an XXCH channel set can be added to the mix */

  2287.         channel_mask = s->xxch_core_spkmask;

  2288. 

  2289.         if (avctx->request_channels > 0

  2290.             && avctx->request_channels < s->prim_channels) {

  2291.             channels = num_core_channels + !!s->lfe;

  2292.             for (i = 0; i < s->xxch_chset && channels + s->xxch_chset_nch[i]

  2293.                                               <= avctx->request_channels; i++) {

  2294.                 channels += s->xxch_chset_nch[i];

  2295.                 channel_mask |= s->xxch_spk_masks[i];

  2296.             }

  2297.         } else {

  2298.             channels = s->prim_channels + !!s->lfe;

  2299.             for (i = 0; i < s->xxch_chset; i++) {

  2300.                 channel_mask |= s->xxch_spk_masks[i];

  2301.             }

  2302.         }

  2303. 

  2304.         /* Given the DTS spec'ed channel mask, generate an avcodec version */

  2305.         channel_layout = 0;

  2306.         for (i = 0; i < s->xxch_nbits_spk_mask; ++i) {

  2307.             if (channel_mask & (1 << i)) {

  2308.                 channel_layout |= map_xxch_to_native[i];

  2309.             }

  2310.         }

  2311. 

  2312.         /* make sure that we have managed to get equivelant dts/avcodec channel

  2313.          * masks in some sense -- unfortunately some channels could overlap */

  2314.         if (av_popcount(channel_mask) != av_popcount(channel_layout)) {

  2315.             av_log(avctx, AV_LOG_DEBUG,

  2316.                    "DTS-XXCH: Inconsistant avcodec/dts channel layouts\n");

  2317.             return AVERROR_INVALIDDATA;

  2318.         }

  2319. 

  2320.         avctx->channel_layout = channel_layout;

  2321. 

  2322.         if (!(avctx->request_channel_layout & AV_CH_LAYOUT_NATIVE)) {

  2323.             /* Estimate DTS --> avcodec ordering table */

  2324.             for (chset = -1, j = 0; chset < s->xxch_chset; ++chset) {

  2325.                 mask = chset >= 0 ? s->xxch_spk_masks[chset]

  2326.                                   : s->xxch_core_spkmask;

  2327.                 for (i = 0; i < s->xxch_nbits_spk_mask; i++) {

  2328.                     if (mask & ~(DCA_XXCH_LFE1 | DCA_XXCH_LFE2) & (1 << i)) {

  2329.                         lavc = map_xxch_to_native[i];

  2330.                         posn = av_popcount(channel_layout & (lavc - 1));

  2331.                         s->xxch_order_tab[j++] = posn;

  2332.                     }

  2333.                 }

  2334.             }

  2335. 

  2336.             s->lfe_index = av_popcount(channel_layout & (AV_CH_LOW_FREQUENCY-1));

  2337.         } else { /* native ordering */

  2338.             for (i = 0; i < channels; i++)

  2339.                 s->xxch_order_tab[i] = i;

  2340. 

  2341.             s->lfe_index = channels - 1;

  2342.         }

  2343. 

  2344.         s->channel_order_tab = s->xxch_order_tab;

  2345.     }

  2346. 

  2347.     if (avctx->channels != channels) {

  2348.         if (avctx->channels)

  2349.             av_log(avctx, AV_LOG_INFO, "Number of channels changed in DCA decoder (%d -> %d)\n", avctx->channels, channels);

  2350.         avctx->channels = channels;

  2351.     }

  2352. 

  2353.     /* get output buffer */

  2354.     frame->nb_samples = 256 * (s->sample_blocks / 8);

  2355.     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)

  2356.         return ret;

  2357.     samples_flt = (float **)frame->extended_data;

  2358. 

  2359.     /* allocate buffer for extra channels if downmixing */

  2360.     if (avctx->channels < full_channels) {

  2361.         ret = av_samples_get_buffer_size(NULL, full_channels - channels,

  2362.                                          frame->nb_samples,

  2363.                                          avctx->sample_fmt, 0);

  2364.         if (ret < 0)

  2365.             return ret;

  2366. 

  2367.         av_fast_malloc(&s->extra_channels_buffer,

  2368.                        &s->extra_channels_buffer_size, ret);

  2369.         if (!s->extra_channels_buffer)

  2370.             return AVERROR(ENOMEM);

  2371. 

  2372.         ret = av_samples_fill_arrays((uint8_t **)s->extra_channels, NULL,

  2373.                                      s->extra_channels_buffer,

  2374.                                      full_channels - channels,

  2375.                                      frame->nb_samples, avctx->sample_fmt, 0);

  2376.         if (ret < 0)

  2377.             return ret;

  2378.     }

  2379. 

  2380.     /* filter to get final output */

  2381.     for (i = 0; i < (s->sample_blocks / 8); i++) {

  2382.         int ch;

  2383. 

  2384.         for (ch = 0; ch < channels; ch++)

  2385.             s->samples_chanptr[ch] = samples_flt[ch] + i * 256;

  2386.         for (; ch < full_channels; ch++)

  2387.             s->samples_chanptr[ch] = s->extra_channels[ch - channels] + i * 256;

  2388. 

  2389.         dca_filter_channels(s, i);

  2390. 

  2391.         /* If this was marked as a DTS-ES stream we need to subtract back- */

  2392.         /* channel from SL & SR to remove matrixed back-channel signal */

  2393.         if ((s->source_pcm_res & 1) && s->xch_present) {

  2394.             float *back_chan = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel]];

  2395.             float *lt_chan   = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel - 2]];

  2396.             float *rt_chan   = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel - 1]];

  2397.             s->fdsp.vector_fmac_scalar(lt_chan, back_chan, -M_SQRT1_2, 256);

  2398.             s->fdsp.vector_fmac_scalar(rt_chan, back_chan, -M_SQRT1_2, 256);

  2399.         }

  2400. 

  2401.         /* If stream contains XXCH, we might need to undo an embedded downmix */

  2402.         if (s->xxch_dmix_embedded) {

  2403.             /* Loop over channel sets in turn */

  2404.             ch = num_core_channels;

  2405.             for (chset = 0; chset < s->xxch_chset; chset++) {

  2406.                 endch = ch + s->xxch_chset_nch[chset];

  2407.                 mask = s->xxch_dmix_embedded;

  2408. 

  2409.                 /* undo downmix */

  2410.                 for (j = ch; j < endch; j++) {

  2411.                     if (mask & (1 << j)) { /* this channel has been mixed-out */

  2412.                         src_chan = s->samples_chanptr[s->channel_order_tab[j]];

  2413.                         for (k = 0; k < endch; k++) {

  2414.                             achan = s->channel_order_tab[k];

  2415.                             scale = s->xxch_dmix_coeff[j][k];

  2416.                             if (scale != 0.0) {

  2417.                                 dst_chan = s->samples_chanptr[achan];

  2418.                                 s->fdsp.vector_fmac_scalar(dst_chan, src_chan,

  2419.                                                            -scale, 256);

  2420.                             }

  2421.                         }

  2422.                     }

  2423.                 }

  2424. 

  2425.                 /* if a downmix has been embedded then undo the pre-scaling */

  2426.                 if ((mask & (1 << ch)) && s->xxch_dmix_sf[chset] != 1.0f) {

  2427.                     scale = s->xxch_dmix_sf[chset];

  2428. 

  2429.                     for (j = 0; j < ch; j++) {

  2430.                         src_chan = s->samples_chanptr[s->channel_order_tab[j]];

  2431.                         for (k = 0; k < 256; k++)

  2432.                             src_chan[k] *= scale;

  2433.                     }

  2434. 

  2435.                     /* LFE channel is always part of core, scale if it exists */

  2436.                     if (s->lfe) {

  2437.                         src_chan = s->samples_chanptr[s->lfe_index];

  2438.                         for (k = 0; k < 256; k++)

  2439.                             src_chan[k] *= scale;

  2440.                     }

  2441.                 }

  2442. 

  2443.                 ch = endch;

  2444.             }

  2445. 

  2446.         }

  2447.     }

  2448. 

  2449.     /* update lfe history */

  2450.     lfe_samples = 2 * s->lfe * (s->sample_blocks / 8);

  2451.     for (i = 0; i < 2 * s->lfe * 4; i++)

  2452.         s->lfe_data[i] = s->lfe_data[i + lfe_samples];

  2453. 

  2454.     *got_frame_ptr = 1;

  2455. 

  2456.     return buf_size;

  2457. }

  2458. 

  2459. 

  2460. 

  2461. /**

  2462.  * DCA initialization

  2463.  *

  2464.  * @param avctx     pointer to the AVCodecContext

  2465.  */

  2466. 

  2467. static av_cold int dca_decode_init(AVCodecContext *avctx)

  2468. {

  2469.     DCAContext *s = avctx->priv_data;

  2470. 

  2471.     s->avctx = avctx;

  2472.     dca_init_vlcs();

  2473. 

  2474.     avpriv_float_dsp_init(&s->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);

  2475.     ff_mdct_init(&s->imdct, 6, 1, 1.0);

  2476.     ff_synth_filter_init(&s->synth);

  2477.     ff_dcadsp_init(&s->dcadsp);

  2478.     ff_fmt_convert_init(&s->fmt_conv, avctx);

  2479. 

  2480.     avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;

  2481. 

  2482.     /* allow downmixing to stereo */

  2483.     if (avctx->channels > 0 && avctx->request_channels < avctx->channels &&

  2484.         avctx->request_channels == 2) {

  2485.         avctx->channels = avctx->request_channels;

  2486.     }

  2487. 

  2488.     return 0;

  2489. }

  2490. 

  2491. static av_cold int dca_decode_end(AVCodecContext *avctx)

  2492. {

  2493.     DCAContext *s = avctx->priv_data;

  2494.     ff_mdct_end(&s->imdct);

  2495.     av_freep(&s->extra_channels_buffer);

  2496.     return 0;

  2497. }

  2498. 

  2499. static const AVProfile profiles[] = {

  2500.     { FF_PROFILE_DTS,        "DTS"        },

  2501.     { FF_PROFILE_DTS_ES,     "DTS-ES"     },

  2502.     { FF_PROFILE_DTS_96_24,  "DTS 96/24"  },

  2503.     { FF_PROFILE_DTS_HD_HRA, "DTS-HD HRA" },

  2504.     { FF_PROFILE_DTS_HD_MA,  "DTS-HD MA"  },

  2505.     { FF_PROFILE_UNKNOWN },

  2506. };

  2507. 

  2508. AVCodec ff_dca_decoder = {

  2509.     .name            = "dca",

  2510.     .type            = AVMEDIA_TYPE_AUDIO,

  2511.     .id              = AV_CODEC_ID_DTS,

  2512.     .priv_data_size  = sizeof(DCAContext),

  2513.     .init            = dca_decode_init,

  2514.     .decode          = dca_decode_frame,

  2515.     .close           = dca_decode_end,

  2516.     .long_name       = NULL_IF_CONFIG_SMALL("DCA (DTS Coherent Acoustics)"),

  2517.     .capabilities    = CODEC_CAP_CHANNEL_CONF | CODEC_CAP_DR1,

  2518.     .sample_fmts     = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,

  2519.                                                        AV_SAMPLE_FMT_NONE },

  2520.     .profiles        = NULL_IF_CONFIG_SMALL(profiles),

  2521. };