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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/common.h"

  30. #include "libavutil/float_dsp.h"

  31. #include "libavutil/intmath.h"

  32. #include "libavutil/intreadwrite.h"

  33. #include "libavutil/mathematics.h"

  34. #include "libavutil/audioconvert.h"

  35. #include "avcodec.h"

  36. #include "dsputil.h"

  37. #include "fft.h"

  38. #include "get_bits.h"

  39. #include "put_bits.h"

  40. #include "dcadata.h"

  41. #include "dcahuff.h"

  42. #include "dca.h"

  43. #include "dca_parser.h"

  44. #include "synth_filter.h"

  45. #include "dcadsp.h"

  46. #include "fmtconvert.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.     AVFrame frame;

  351.     /* Frame header */

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

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

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

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

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

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

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

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

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

  361. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  375.     int copy_history;           ///< copy history

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

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

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

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

  380. 

  381.     /* Primary audio coding header */

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

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

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

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

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

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

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

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

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

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

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

  393. 

  394.     /* Primary audio coding side information */

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

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

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

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

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

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

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

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

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

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

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

  406. 

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

  408. 

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

  410.     int lfe_scale_factor;

  411. 

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

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

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

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

  416.     int hist_index[DCA_PRIM_CHANNELS_MAX];

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

  418. 

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

  420. 

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

  422.     float *samples_chanptr[DCA_PRIM_CHANNELS_MAX + 1];

  423. 

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

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

  426. 

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

  428.     GetBitContext gb;

  429.     /* Current position in DCA frame */

  430.     int current_subframe;

  431.     int current_subsubframe;

  432. 

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

  434. 

  435.     /* XCh extension information */

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

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

  438. 

  439.     /* XXCH extension information */

  440.     int xxch_chset;

  441.     int xxch_nbits_spk_mask;

  442.     uint32_t xxch_core_spkmask;

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

  444.     int xxch_chset_nch[4];

  445.     float xxch_dmix_sf[DCA_CHSETS_MAX];

  446. 

  447.     uint32_t xxch_downmix;        /* downmix enabled per channel set */

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

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

  450. 

  451.     int8_t xxch_order_tab[32];

  452.     int8_t lfe_index;

  453. 

  454.     /* ExSS header parser */

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

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

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

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

  459. 

  460.     int profile;

  461. 

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

  463.     AVFloatDSPContext fdsp;

  464.     FFTContext imdct;

  465.     SynthFilterContext synth;

  466.     DCADSPContext dcadsp;

  467.     FmtConvertContext fmt_conv;

  468. } DCAContext;

  469. 

  470. static const uint16_t dca_vlc_offs[] = {

  471.         0,   512,   640,   768,  1282,  1794,  2436,  3080,  3770,  4454,  5364,

  472.      5372,  5380,  5388,  5392,  5396,  5412,  5420,  5428,  5460,  5492,  5508,

  473.      5572,  5604,  5668,  5796,  5860,  5892,  6412,  6668,  6796,  7308,  7564,

  474.      7820,  8076,  8620,  9132,  9388,  9910, 10166, 10680, 11196, 11726, 12240,

  475.     12752, 13298, 13810, 14326, 14840, 15500, 16022, 16540, 17158, 17678, 18264,

  476.     18796, 19352, 19926, 20468, 21472, 22398, 23014, 23622,

  477. };

  478. 

  479. static av_cold void dca_init_vlcs(void)

  480. {

  481.     static int vlcs_initialized = 0;

  482.     int i, j, c = 14;

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

  484. 

  485.     if (vlcs_initialized)

  486.         return;

  487. 

  488.     dca_bitalloc_index.offset = 1;

  489.     dca_bitalloc_index.wrap = 2;

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

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

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

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

  494.                  bitalloc_12_bits[i], 1, 1,

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

  496.     }

  497.     dca_scalefactor.offset = -64;

  498.     dca_scalefactor.wrap = 2;

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

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

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

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

  503.                  scales_bits[i], 1, 1,

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

  505.     }

  506.     dca_tmode.offset = 0;

  507.     dca_tmode.wrap = 1;

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

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

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

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

  512.                  tmode_bits[i], 1, 1,

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

  514.     }

  515. 

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

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

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

  519.                 break;

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

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

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

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

  524. 

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

  526.                      bitalloc_sizes[i],

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

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

  529.             c++;

  530.         }

  531.     vlcs_initialized = 1;

  532. }

  533. 

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

  535. {

  536.     while (len--)

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

  538. }

  539. 

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

  541. {

  542.     int i, base, mask;

  543. 

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

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

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

  547.         base += av_popcount(mask);

  548. 

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

  550. }

  551. 

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

  553.                                          int xxch)

  554. {

  555.     int i, j;

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

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

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

  559.     int hdr_pos = 0, hdr_size = 0;

  560.     float sign, mag, scale_factor;

  561.     int this_chans, acc_mask;

  562.     int embedded_downmix;

  563.     int nchans, mask[8];

  564.     int coeff, ichan;

  565. 

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

  567.     if (xxch) {

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

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

  570.     }

  571. 

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

  573.     s->total_channels = nchans + base_channel;

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

  575. 

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

  577.     if (xxch) {

  578.         acc_mask = s->xxch_core_spkmask;

  579. 

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

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

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

  583. 

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

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

  586. 

  587.         /* check for downmixing information */

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

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

  590.             scale_factor     =

  591.                1.0f / dca_downmix_scale_factors[(get_bits(&s->gb, 6) - 1) << 2];

  592. 

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

  594. 

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

  596.                 s->xxch_downmix |= (1 << 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.     /* TODO: check CRC */

  739.     if (s->crc_present)

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

  741. 

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

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

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

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

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

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

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

  749. 

  750.     /* FIXME: channels mixing levels */

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

  752.     if (s->lfe)

  753.         s->output |= DCA_LFE;

  754. 

  755. #ifdef TRACE

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

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

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

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

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

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

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

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

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

  765.            s->sample_rate);

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

  767.            s->bit_rate);

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

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

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

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

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

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

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

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

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

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

  778.            s->predictor_history);

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

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

  781.            s->multirate_inter);

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

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

  784.     av_log(s->avctx, AV_LOG_DEBUG,

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

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

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

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

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

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

  791. #endif

  792. 

  793.     /* Primary audio coding header */

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

  795. 

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

  797. }

  798. 

  799. 

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

  801. {

  802.     if (level < 5) {

  803.         /* huffman encoded */

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

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

  806.     } else if (level < 8) {

  807.         if (level + 1 > log2range) {

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

  809.             value = get_bits(gb, log2range);

  810.         } else {

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

  812.         }

  813.     }

  814.     return value;

  815. }

  816. 

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

  818. {

  819.     /* Primary audio coding side information */

  820.     int j, k;

  821. 

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

  823.         return AVERROR_INVALIDDATA;

  824. 

  825.     if (!base_channel) {

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

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

  828.     }

  829. 

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

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

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

  833.     }

  834. 

  835.     /* Get prediction codebook */

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

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

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

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

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

  841.             }

  842.         }

  843.     }

  844. 

  845.     /* Bit allocation index */

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

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

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

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

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

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

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

  853.                 av_log(s->avctx, AV_LOG_ERROR,

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

  855.                 return AVERROR_INVALIDDATA;

  856.             } else {

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

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

  859.             }

  860. 

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

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

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

  864.                 return AVERROR_INVALIDDATA;

  865.             }

  866.         }

  867.     }

  868. 

  869.     /* Transition mode */

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

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

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

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

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

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

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

  877.             }

  878.         }

  879.     }

  880. 

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

  882.         return AVERROR_INVALIDDATA;

  883. 

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

  885.         const uint32_t *scale_table;

  886.         int scale_sum, log_size;

  887. 

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

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

  890. 

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

  892.             scale_table = scale_factor_quant7;

  893.             log_size = 7;

  894.         } else {

  895.             scale_table = scale_factor_quant6;

  896.             log_size = 6;

  897.         }

  898. 

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

  900.         scale_sum = 0;

  901. 

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

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

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

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

  906.             }

  907. 

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

  909.                 /* Get second scale factor */

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

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

  912.             }

  913.         }

  914.     }

  915. 

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

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

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

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

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

  921.     }

  922. 

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

  924.         return AVERROR_INVALIDDATA;

  925. 

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

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

  928.         int source_channel;

  929. 

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

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

  932.             int scale = 0;

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

  934. 

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

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

  937. 

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

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

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

  941.             }

  942. 

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

  944.                 av_log(s->avctx, AV_LOG_DEBUG,

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

  946.                 s->debug_flag |= 0x02;

  947.             }

  948.         }

  949.     }

  950. 

  951.     /* Stereo downmix coefficients */

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

  953.         if (s->downmix) {

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

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

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

  957.             }

  958.         } else {

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

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

  961.                 av_log(s->avctx, AV_LOG_ERROR,

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

  963.                 return AVERROR_INVALIDDATA;

  964.             }

  965.             for (j = base_channel; j < FFMIN(s->prim_channels, FF_ARRAY_ELEMS(dca_default_coeffs[am])); j++) {

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

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

  968.             }

  969.         }

  970.     }

  971. 

  972.     /* Dynamic range coefficient */

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

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

  975. 

  976.     /* Side information CRC check word */

  977.     if (s->crc_present) {

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

  979.     }

  980. 

  981.     /*

  982.      * Primary audio data arrays

  983.      */

  984. 

  985.     /* VQ encoded high frequency subbands */

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

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

  988.             /* 1 vector -> 32 samples */

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

  990. 

  991.     /* Low frequency effect data */

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

  993.         int quant7;

  994.         /* LFE samples */

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

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

  997.         float lfe_scale;

  998. 

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

  1000.             /* Signed 8 bits int */

  1001.             s->lfe_data[j] = get_sbits(&s->gb, 8);

  1002.         }

  1003. 

  1004.         /* Scale factor index */

  1005.         quant7 = get_bits(&s->gb, 8);

  1006.         if (quant7 > 127) {

  1007.             av_log_ask_for_sample(s->avctx, "LFEScaleIndex larger than 127\n");

  1008.             return AVERROR_INVALIDDATA;

  1009.         }

  1010.         s->lfe_scale_factor = scale_factor_quant7[quant7];

  1011. 

  1012.         /* Quantization step size * scale factor */

  1013.         lfe_scale = 0.035 * s->lfe_scale_factor;

  1014. 

  1015.         for (j = lfe_samples; j < lfe_end_sample; j++)

  1016.             s->lfe_data[j] *= lfe_scale;

  1017.     }

  1018. 

  1019. #ifdef TRACE

  1020.     av_log(s->avctx, AV_LOG_DEBUG, "subsubframes: %i\n",

  1021.            s->subsubframes[s->current_subframe]);

  1022.     av_log(s->avctx, AV_LOG_DEBUG, "partial samples: %i\n",

  1023.            s->partial_samples[s->current_subframe]);

  1024. 

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

  1026.         av_log(s->avctx, AV_LOG_DEBUG, "prediction mode:");

  1027.         for (k = 0; k < s->subband_activity[j]; k++)

  1028.             av_log(s->avctx, AV_LOG_DEBUG, " %i", s->prediction_mode[j][k]);

  1029.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1030.     }

  1031.     for (j = base_channel; j < s->prim_channels; j++) {

  1032.         for (k = 0; k < s->subband_activity[j]; k++)

  1033.             av_log(s->avctx, AV_LOG_DEBUG,

  1034.                    "prediction coefs: %f, %f, %f, %f\n",

  1035.                    (float) adpcm_vb[s->prediction_vq[j][k]][0] / 8192,

  1036.                    (float) adpcm_vb[s->prediction_vq[j][k]][1] / 8192,

  1037.                    (float) adpcm_vb[s->prediction_vq[j][k]][2] / 8192,

  1038.                    (float) adpcm_vb[s->prediction_vq[j][k]][3] / 8192);

  1039.     }

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

  1041.         av_log(s->avctx, AV_LOG_DEBUG, "bitalloc index: ");

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

  1043.             av_log(s->avctx, AV_LOG_DEBUG, "%2.2i ", s->bitalloc[j][k]);

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

  1045.     }

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

  1047.         av_log(s->avctx, AV_LOG_DEBUG, "Transition mode:");

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

  1049.             av_log(s->avctx, AV_LOG_DEBUG, " %i", s->transition_mode[j][k]);

  1050.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1051.     }

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

  1053.         av_log(s->avctx, AV_LOG_DEBUG, "Scale factor:");

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

  1055.             if (k >= s->vq_start_subband[j] || s->bitalloc[j][k] > 0)

  1056.                 av_log(s->avctx, AV_LOG_DEBUG, " %i", s->scale_factor[j][k][0]);

  1057.             if (k < s->vq_start_subband[j] && s->transition_mode[j][k])

  1058.                 av_log(s->avctx, AV_LOG_DEBUG, " %i(t)", s->scale_factor[j][k][1]);

  1059.         }

  1060.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1061.     }

  1062.     for (j = base_channel; j < s->prim_channels; j++) {

  1063.         if (s->joint_intensity[j] > 0) {

  1064.             int source_channel = s->joint_intensity[j] - 1;

  1065.             av_log(s->avctx, AV_LOG_DEBUG, "Joint scale factor index:\n");

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

  1067.                 av_log(s->avctx, AV_LOG_DEBUG, " %i", s->joint_scale_factor[j][k]);

  1068.             av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1069.         }

  1070.     }

  1071.     if (!base_channel && s->prim_channels > 2 && s->downmix) {

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

  1073.         for (j = 0; j < s->prim_channels; j++) {

  1074.             av_log(s->avctx, AV_LOG_DEBUG, "Channel 0, %d = %f\n", j,

  1075.                    dca_downmix_coeffs[s->downmix_coef[j][0]]);

  1076.             av_log(s->avctx, AV_LOG_DEBUG, "Channel 1, %d = %f\n", j,

  1077.                    dca_downmix_coeffs[s->downmix_coef[j][1]]);

  1078.         }

  1079.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1080.     }

  1081.     for (j = base_channel; j < s->prim_channels; j++)

  1082.         for (k = s->vq_start_subband[j]; k < s->subband_activity[j]; k++)

  1083.             av_log(s->avctx, AV_LOG_DEBUG, "VQ index: %i\n", s->high_freq_vq[j][k]);

  1084.     if (!base_channel && s->lfe) {

  1085.         int lfe_samples = 2 * s->lfe * (4 + block_index);

  1086.         int lfe_end_sample = 2 * s->lfe * (4 + block_index + s->subsubframes[s->current_subframe]);

  1087. 

  1088.         av_log(s->avctx, AV_LOG_DEBUG, "LFE samples:\n");

  1089.         for (j = lfe_samples; j < lfe_end_sample; j++)

  1090.             av_log(s->avctx, AV_LOG_DEBUG, " %f", s->lfe_data[j]);

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

  1092.     }

  1093. #endif

  1094. 

  1095.     return 0;

  1096. }

  1097. 

  1098. static void qmf_32_subbands(DCAContext *s, int chans,

  1099.                             float samples_in[32][8], float *samples_out,

  1100.                             float scale)

  1101. {

  1102.     const float *prCoeff;

  1103.     int i;

  1104. 

  1105.     int sb_act = s->subband_activity[chans];

  1106.     int subindex;

  1107. 

  1108.     scale *= sqrt(1 / 8.0);

  1109. 

  1110.     /* Select filter */

  1111.     if (!s->multirate_inter)    /* Non-perfect reconstruction */

  1112.         prCoeff = fir_32bands_nonperfect;

  1113.     else                        /* Perfect reconstruction */

  1114.         prCoeff = fir_32bands_perfect;

  1115. 

  1116.     for (i = sb_act; i < 32; i++)

  1117.         s->raXin[i] = 0.0;

  1118. 

  1119.     /* Reconstructed channel sample index */

  1120.     for (subindex = 0; subindex < 8; subindex++) {

  1121.         /* Load in one sample from each subband and clear inactive subbands */

  1122.         for (i = 0; i < sb_act; i++) {

  1123.             unsigned sign = (i - 1) & 2;

  1124.             uint32_t v    = AV_RN32A(&samples_in[i][subindex]) ^ sign << 30;

  1125.             AV_WN32A(&s->raXin[i], v);

  1126.         }

  1127. 

  1128.         s->synth.synth_filter_float(&s->imdct,

  1129.                                     s->subband_fir_hist[chans],

  1130.                                     &s->hist_index[chans],

  1131.                                     s->subband_fir_noidea[chans], prCoeff,

  1132.                                     samples_out, s->raXin, scale);

  1133.         samples_out += 32;

  1134.     }

  1135. }

  1136. 

  1137. static void lfe_interpolation_fir(DCAContext *s, int decimation_select,

  1138.                                   int num_deci_sample, float *samples_in,

  1139.                                   float *samples_out, float scale)

  1140. {

  1141.     /* samples_in: An array holding decimated samples.

  1142.      *   Samples in current subframe starts from samples_in[0],

  1143.      *   while samples_in[-1], samples_in[-2], ..., stores samples

  1144.      *   from last subframe as history.

  1145.      *

  1146.      * samples_out: An array holding interpolated samples

  1147.      */

  1148. 

  1149.     int decifactor;

  1150.     const float *prCoeff;

  1151.     int deciindex;

  1152. 

  1153.     /* Select decimation filter */

  1154.     if (decimation_select == 1) {

  1155.         decifactor = 64;

  1156.         prCoeff = lfe_fir_128;

  1157.     } else {

  1158.         decifactor = 32;

  1159.         prCoeff = lfe_fir_64;

  1160.     }

  1161.     /* Interpolation */

  1162.     for (deciindex = 0; deciindex < num_deci_sample; deciindex++) {

  1163.         s->dcadsp.lfe_fir(samples_out, samples_in, prCoeff, decifactor, scale);

  1164.         samples_in++;

  1165.         samples_out += 2 * decifactor;

  1166.     }

  1167. }

  1168. 

  1169. /* downmixing routines */

  1170. #define MIX_REAR1(samples, s1, rs, coef)            \

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

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

  1173. 

  1174. #define MIX_REAR2(samples, s1, s2, rs, coef)                                          \

  1175.     samples[0][i] += samples[s1][i] * coef[rs][0] + samples[s2][i] * coef[rs + 1][0]; \

  1176.     samples[1][i] += samples[s1][i] * coef[rs][1] + samples[s2][i] * coef[rs + 1][1];

  1177. 

  1178. #define MIX_FRONT3(samples, coef)                                      \

  1179.     t = samples[c][i];                                                 \

  1180.     u = samples[l][i];                                                 \

  1181.     v = samples[r][i];                                                 \

  1182.     samples[0][i] = t * coef[0][0] + u * coef[1][0] + v * coef[2][0];  \

  1183.     samples[1][i] = t * coef[0][1] + u * coef[1][1] + v * coef[2][1];

  1184. 

  1185. #define DOWNMIX_TO_STEREO(op1, op2)             \

  1186.     for (i = 0; i < 256; i++) {                 \

  1187.         op1                                     \

  1188.         op2                                     \

  1189.     }

  1190. 

  1191. static void dca_downmix(float **samples, int srcfmt,

  1192.                         int downmix_coef[DCA_PRIM_CHANNELS_MAX][2],

  1193.                         const int8_t *channel_mapping)

  1194. {

  1195.     int c, l, r, sl, sr, s;

  1196.     int i;

  1197.     float t, u, v;

  1198.     float coef[DCA_PRIM_CHANNELS_MAX][2];

  1199. 

  1200.     for (i = 0; i < DCA_PRIM_CHANNELS_MAX; i++) {

  1201.         coef[i][0] = dca_downmix_coeffs[downmix_coef[i][0]];

  1202.         coef[i][1] = dca_downmix_coeffs[downmix_coef[i][1]];

  1203.     }

  1204. 

  1205.     switch (srcfmt) {

  1206.     case DCA_MONO:

  1207.     case DCA_CHANNEL:

  1208.     case DCA_STEREO_TOTAL:

  1209.     case DCA_STEREO_SUMDIFF:

  1210.     case DCA_4F2R:

  1211.         av_log(NULL, 0, "Not implemented!\n");

  1212.         break;

  1213.     case DCA_STEREO:

  1214.         break;

  1215.     case DCA_3F:

  1216.         c = channel_mapping[0];

  1217.         l = channel_mapping[1];

  1218.         r = channel_mapping[2];

  1219.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef), );

  1220.         break;

  1221.     case DCA_2F1R:

  1222.         s = channel_mapping[2];

  1223.         DOWNMIX_TO_STEREO(MIX_REAR1(samples, s, 2, coef), );

  1224.         break;

  1225.     case DCA_3F1R:

  1226.         c = channel_mapping[0];

  1227.         l = channel_mapping[1];

  1228.         r = channel_mapping[2];

  1229.         s = channel_mapping[3];

  1230.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),

  1231.                           MIX_REAR1(samples, s, 3, coef));

  1232.         break;

  1233.     case DCA_2F2R:

  1234.         sl = channel_mapping[2];

  1235.         sr = channel_mapping[3];

  1236.         DOWNMIX_TO_STEREO(MIX_REAR2(samples, sl, sr, 2, coef), );

  1237.         break;

  1238.     case DCA_3F2R:

  1239.         c  = channel_mapping[0];

  1240.         l  = channel_mapping[1];

  1241.         r  = channel_mapping[2];

  1242.         sl = channel_mapping[3];

  1243.         sr = channel_mapping[4];

  1244.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),

  1245.                           MIX_REAR2(samples, sl, sr, 3, coef));

  1246.         break;

  1247.     }

  1248. }

  1249. 

  1250. 

  1251. #ifndef decode_blockcodes

  1252. /* Very compact version of the block code decoder that does not use table

  1253.  * look-up but is slightly slower */

  1254. static int decode_blockcode(int code, int levels, int *values)

  1255. {

  1256.     int i;

  1257.     int offset = (levels - 1) >> 1;

  1258. 

  1259.     for (i = 0; i < 4; i++) {

  1260.         int div = FASTDIV(code, levels);

  1261.         values[i] = code - offset - div * levels;

  1262.         code = div;

  1263.     }

  1264. 

  1265.     return code;

  1266. }

  1267. 

  1268. static int decode_blockcodes(int code1, int code2, int levels, int *values)

  1269. {

  1270.     return decode_blockcode(code1, levels, values) |

  1271.            decode_blockcode(code2, levels, values + 4);

  1272. }

  1273. #endif

  1274. 

  1275. static const uint8_t abits_sizes[7]  = { 7, 10, 12, 13, 15, 17, 19 };

  1276. static const uint8_t abits_levels[7] = { 3,  5,  7,  9, 13, 17, 25 };

  1277. 

  1278. #ifndef int8x8_fmul_int32

  1279. static inline void int8x8_fmul_int32(float *dst, const int8_t *src, int scale)

  1280. {

  1281.     float fscale = scale / 16.0;

  1282.     int i;

  1283.     for (i = 0; i < 8; i++)

  1284.         dst[i] = src[i] * fscale;

  1285. }

  1286. #endif

  1287. 

  1288. static int dca_subsubframe(DCAContext *s, int base_channel, int block_index)

  1289. {

  1290.     int k, l;

  1291.     int subsubframe = s->current_subsubframe;

  1292. 

  1293.     const float *quant_step_table;

  1294. 

  1295.     /* FIXME */

  1296.     float (*subband_samples)[DCA_SUBBANDS][8] = s->subband_samples[block_index];

  1297.     LOCAL_ALIGNED_16(int, block, [8]);

  1298. 

  1299.     /*

  1300.      * Audio data

  1301.      */

  1302. 

  1303.     /* Select quantization step size table */

  1304.     if (s->bit_rate_index == 0x1f)

  1305.         quant_step_table = lossless_quant_d;

  1306.     else

  1307.         quant_step_table = lossy_quant_d;

  1308. 

  1309.     for (k = base_channel; k < s->prim_channels; k++) {

  1310.         if (get_bits_left(&s->gb) < 0)

  1311.             return AVERROR_INVALIDDATA;

  1312. 

  1313.         for (l = 0; l < s->vq_start_subband[k]; l++) {

  1314.             int m;

  1315. 

  1316.             /* Select the mid-tread linear quantizer */

  1317.             int abits = s->bitalloc[k][l];

  1318. 

  1319.             float quant_step_size = quant_step_table[abits];

  1320. 

  1321.             /*

  1322.              * Determine quantization index code book and its type

  1323.              */

  1324. 

  1325.             /* Select quantization index code book */

  1326.             int sel = s->quant_index_huffman[k][abits];

  1327. 

  1328.             /*

  1329.              * Extract bits from the bit stream

  1330.              */

  1331.             if (!abits) {

  1332.                 memset(subband_samples[k][l], 0, 8 * sizeof(subband_samples[0][0][0]));

  1333.             } else {

  1334.                 /* Deal with transients */

  1335.                 int sfi = s->transition_mode[k][l] && subsubframe >= s->transition_mode[k][l];

  1336.                 float rscale = quant_step_size * s->scale_factor[k][l][sfi] *

  1337.                                s->scalefactor_adj[k][sel];

  1338. 

  1339.                 if (abits >= 11 || !dca_smpl_bitalloc[abits].vlc[sel].table) {

  1340.                     if (abits <= 7) {

  1341.                         /* Block code */

  1342.                         int block_code1, block_code2, size, levels, err;

  1343. 

  1344.                         size   = abits_sizes[abits - 1];

  1345.                         levels = abits_levels[abits - 1];

  1346. 

  1347.                         block_code1 = get_bits(&s->gb, size);

  1348.                         block_code2 = get_bits(&s->gb, size);

  1349.                         err = decode_blockcodes(block_code1, block_code2,

  1350.                                                 levels, block);

  1351.                         if (err) {

  1352.                             av_log(s->avctx, AV_LOG_ERROR,

  1353.                                    "ERROR: block code look-up failed\n");

  1354.                             return AVERROR_INVALIDDATA;

  1355.                         }

  1356.                     } else {

  1357.                         /* no coding */

  1358.                         for (m = 0; m < 8; m++)

  1359.                             block[m] = get_sbits(&s->gb, abits - 3);

  1360.                     }

  1361.                 } else {

  1362.                     /* Huffman coded */

  1363.                     for (m = 0; m < 8; m++)

  1364.                         block[m] = get_bitalloc(&s->gb,

  1365.                                                 &dca_smpl_bitalloc[abits], sel);

  1366.                 }

  1367. 

  1368.                 s->fmt_conv.int32_to_float_fmul_scalar(subband_samples[k][l],

  1369.                                                        block, rscale, 8);

  1370.             }

  1371. 

  1372.             /*

  1373.              * Inverse ADPCM if in prediction mode

  1374.              */

  1375.             if (s->prediction_mode[k][l]) {

  1376.                 int n;

  1377.                 for (m = 0; m < 8; m++) {

  1378.                     for (n = 1; n <= 4; n++)

  1379.                         if (m >= n)

  1380.                             subband_samples[k][l][m] +=

  1381.                                 (adpcm_vb[s->prediction_vq[k][l]][n - 1] *

  1382.                                  subband_samples[k][l][m - n] / 8192);

  1383.                         else if (s->predictor_history)

  1384.                             subband_samples[k][l][m] +=

  1385.                                 (adpcm_vb[s->prediction_vq[k][l]][n - 1] *

  1386.                                  s->subband_samples_hist[k][l][m - n + 4] / 8192);

  1387.                 }

  1388.             }

  1389.         }

  1390. 

  1391.         /*

  1392.          * Decode VQ encoded high frequencies

  1393.          */

  1394.         for (l = s->vq_start_subband[k]; l < s->subband_activity[k]; l++) {

  1395.             /* 1 vector -> 32 samples but we only need the 8 samples

  1396.              * for this subsubframe. */

  1397.             int hfvq = s->high_freq_vq[k][l];

  1398. 

  1399.             if (!s->debug_flag & 0x01) {

  1400.                 av_log(s->avctx, AV_LOG_DEBUG,

  1401.                        "Stream with high frequencies VQ coding\n");

  1402.                 s->debug_flag |= 0x01;

  1403.             }

  1404. 

  1405.             int8x8_fmul_int32(subband_samples[k][l],

  1406.                               &high_freq_vq[hfvq][subsubframe * 8],

  1407.                               s->scale_factor[k][l][0]);

  1408.         }

  1409.     }

  1410. 

  1411.     /* Check for DSYNC after subsubframe */

  1412.     if (s->aspf || subsubframe == s->subsubframes[s->current_subframe] - 1) {

  1413.         if (0xFFFF == get_bits(&s->gb, 16)) {   /* 0xFFFF */

  1414. #ifdef TRACE

  1415.             av_log(s->avctx, AV_LOG_DEBUG, "Got subframe DSYNC\n");

  1416. #endif

  1417.         } else {

  1418.             av_log(s->avctx, AV_LOG_ERROR, "Didn't get subframe DSYNC\n");

  1419.         }

  1420.     }

  1421. 

  1422.     /* Backup predictor history for adpcm */

  1423.     for (k = base_channel; k < s->prim_channels; k++)

  1424.         for (l = 0; l < s->vq_start_subband[k]; l++)

  1425.             memcpy(s->subband_samples_hist[k][l],

  1426.                    &subband_samples[k][l][4],

  1427.                    4 * sizeof(subband_samples[0][0][0]));

  1428. 

  1429.     return 0;

  1430. }

  1431. 

  1432. static int dca_filter_channels(DCAContext *s, int block_index)

  1433. {

  1434.     float (*subband_samples)[DCA_SUBBANDS][8] = s->subband_samples[block_index];

  1435.     int k;

  1436. 

  1437.     /* 32 subbands QMF */

  1438.     for (k = 0; k < s->prim_channels; k++) {

  1439. /*        static float pcm_to_double[8] = { 32768.0, 32768.0, 524288.0, 524288.0,

  1440.                                             0, 8388608.0, 8388608.0 };*/

  1441.         qmf_32_subbands(s, k, subband_samples[k],

  1442.                         s->samples_chanptr[s->channel_order_tab[k]],

  1443.                         M_SQRT1_2 / 32768.0 /* pcm_to_double[s->source_pcm_res] */);

  1444.     }

  1445. 

  1446.     /* Down mixing */

  1447.     if (s->avctx->request_channels == 2 && s->prim_channels > 2) {

  1448.         dca_downmix(s->samples_chanptr, s->amode, s->downmix_coef, s->channel_order_tab);

  1449.     }

  1450. 

  1451.     /* Generate LFE samples for this subsubframe FIXME!!! */

  1452.     if (s->output & DCA_LFE) {

  1453.         lfe_interpolation_fir(s, s->lfe, 2 * s->lfe,

  1454.                               s->lfe_data + 2 * s->lfe * (block_index + 4),

  1455.                               s->samples_chanptr[s->lfe_index],

  1456.                               1.0 / (256.0 * 32768.0));

  1457.         /* Outputs 20bits pcm samples */

  1458.     }

  1459. 

  1460.     return 0;

  1461. }

  1462. 

  1463. 

  1464. static int dca_subframe_footer(DCAContext *s, int base_channel)

  1465. {

  1466.     int aux_data_count = 0, i;

  1467. 

  1468.     /*

  1469.      * Unpack optional information

  1470.      */

  1471. 

  1472.     /* presumably optional information only appears in the core? */

  1473.     if (!base_channel) {

  1474.         if (s->timestamp)

  1475.             skip_bits_long(&s->gb, 32);

  1476. 

  1477.         if (s->aux_data)

  1478.             aux_data_count = get_bits(&s->gb, 6);

  1479. 

  1480.         for (i = 0; i < aux_data_count; i++)

  1481.             get_bits(&s->gb, 8);

  1482. 

  1483.         if (s->crc_present && (s->downmix || s->dynrange))

  1484.             get_bits(&s->gb, 16);

  1485.     }

  1486. 

  1487.     return 0;

  1488. }

  1489. 

  1490. /**

  1491.  * Decode a dca frame block

  1492.  *

  1493.  * @param s     pointer to the DCAContext

  1494.  */

  1495. 

  1496. static int dca_decode_block(DCAContext *s, int base_channel, int block_index)

  1497. {

  1498.     int ret;

  1499. 

  1500.     /* Sanity check */

  1501.     if (s->current_subframe >= s->subframes) {

  1502.         av_log(s->avctx, AV_LOG_DEBUG, "check failed: %i>%i",

  1503.                s->current_subframe, s->subframes);

  1504.         return AVERROR_INVALIDDATA;

  1505.     }

  1506. 

  1507.     if (!s->current_subsubframe) {

  1508. #ifdef TRACE

  1509.         av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subframe_header\n");

  1510. #endif

  1511.         /* Read subframe header */

  1512.         if ((ret = dca_subframe_header(s, base_channel, block_index)))

  1513.             return ret;

  1514.     }

  1515. 

  1516.     /* Read subsubframe */

  1517. #ifdef TRACE

  1518.     av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subsubframe\n");

  1519. #endif

  1520.     if ((ret = dca_subsubframe(s, base_channel, block_index)))

  1521.         return ret;

  1522. 

  1523.     /* Update state */

  1524.     s->current_subsubframe++;

  1525.     if (s->current_subsubframe >= s->subsubframes[s->current_subframe]) {

  1526.         s->current_subsubframe = 0;

  1527.         s->current_subframe++;

  1528.     }

  1529.     if (s->current_subframe >= s->subframes) {

  1530. #ifdef TRACE

  1531.         av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subframe_footer\n");

  1532. #endif

  1533.         /* Read subframe footer */

  1534.         if ((ret = dca_subframe_footer(s, base_channel)))

  1535.             return ret;

  1536.     }

  1537. 

  1538.     return 0;

  1539. }

  1540. 

  1541. /**

  1542.  * Return the number of channels in an ExSS speaker mask (HD)

  1543.  */

  1544. static int dca_exss_mask2count(int mask)

  1545. {

  1546.     /* count bits that mean speaker pairs twice */

  1547.     return av_popcount(mask) +

  1548.            av_popcount(mask & (DCA_EXSS_CENTER_LEFT_RIGHT      |

  1549.                                DCA_EXSS_FRONT_LEFT_RIGHT       |

  1550.                                DCA_EXSS_FRONT_HIGH_LEFT_RIGHT  |

  1551.                                DCA_EXSS_WIDE_LEFT_RIGHT        |

  1552.                                DCA_EXSS_SIDE_LEFT_RIGHT        |

  1553.                                DCA_EXSS_SIDE_HIGH_LEFT_RIGHT   |

  1554.                                DCA_EXSS_SIDE_REAR_LEFT_RIGHT   |

  1555.                                DCA_EXSS_REAR_LEFT_RIGHT        |

  1556.                                DCA_EXSS_REAR_HIGH_LEFT_RIGHT));

  1557. }

  1558. 

  1559. /**

  1560.  * Skip mixing coefficients of a single mix out configuration (HD)

  1561.  */

  1562. static void dca_exss_skip_mix_coeffs(GetBitContext *gb, int channels, int out_ch)

  1563. {

  1564.     int i;

  1565. 

  1566.     for (i = 0; i < channels; i++) {

  1567.         int mix_map_mask = get_bits(gb, out_ch);

  1568.         int num_coeffs = av_popcount(mix_map_mask);

  1569.         skip_bits_long(gb, num_coeffs * 6);

  1570.     }

  1571. }

  1572. 

  1573. /**

  1574.  * Parse extension substream asset header (HD)

  1575.  */

  1576. static int dca_exss_parse_asset_header(DCAContext *s)

  1577. {

  1578.     int header_pos = get_bits_count(&s->gb);

  1579.     int header_size;

  1580.     int channels = 0;

  1581.     int embedded_stereo = 0;

  1582.     int embedded_6ch    = 0;

  1583.     int drc_code_present;

  1584.     int av_uninit(extensions_mask);

  1585.     int i, j;

  1586. 

  1587.     if (get_bits_left(&s->gb) < 16)

  1588.         return -1;

  1589. 

  1590.     /* We will parse just enough to get to the extensions bitmask with which

  1591.      * we can set the profile value. */

  1592. 

  1593.     header_size = get_bits(&s->gb, 9) + 1;

  1594.     skip_bits(&s->gb, 3); // asset index

  1595. 

  1596.     if (s->static_fields) {

  1597.         if (get_bits1(&s->gb))

  1598.             skip_bits(&s->gb, 4); // asset type descriptor

  1599.         if (get_bits1(&s->gb))

  1600.             skip_bits_long(&s->gb, 24); // language descriptor

  1601. 

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

  1603.             /* How can one fit 1024 bytes of text here if the maximum value

  1604.              * for the asset header size field above was 512 bytes? */

  1605.             int text_length = get_bits(&s->gb, 10) + 1;

  1606.             if (get_bits_left(&s->gb) < text_length * 8)

  1607.                 return -1;

  1608.             skip_bits_long(&s->gb, text_length * 8); // info text

  1609.         }

  1610. 

  1611.         skip_bits(&s->gb, 5); // bit resolution - 1

  1612.         skip_bits(&s->gb, 4); // max sample rate code

  1613.         channels = get_bits(&s->gb, 8) + 1;

  1614. 

  1615.         if (get_bits1(&s->gb)) { // 1-to-1 channels to speakers

  1616.             int spkr_remap_sets;

  1617.             int spkr_mask_size = 16;

  1618.             int num_spkrs[7];

  1619. 

  1620.             if (channels > 2)

  1621.                 embedded_stereo = get_bits1(&s->gb);

  1622.             if (channels > 6)

  1623.                 embedded_6ch = get_bits1(&s->gb);

  1624. 

  1625.             if (get_bits1(&s->gb)) {

  1626.                 spkr_mask_size = (get_bits(&s->gb, 2) + 1) << 2;

  1627.                 skip_bits(&s->gb, spkr_mask_size); // spkr activity mask

  1628.             }

  1629. 

  1630.             spkr_remap_sets = get_bits(&s->gb, 3);

  1631. 

  1632.             for (i = 0; i < spkr_remap_sets; i++) {

  1633.                 /* std layout mask for each remap set */

  1634.                 num_spkrs[i] = dca_exss_mask2count(get_bits(&s->gb, spkr_mask_size));

  1635.             }

  1636. 

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

  1638.                 int num_dec_ch_remaps = get_bits(&s->gb, 5) + 1;

  1639.                 if (get_bits_left(&s->gb) < 0)

  1640.                     return -1;

  1641. 

  1642.                 for (j = 0; j < num_spkrs[i]; j++) {

  1643.                     int remap_dec_ch_mask = get_bits_long(&s->gb, num_dec_ch_remaps);

  1644.                     int num_dec_ch = av_popcount(remap_dec_ch_mask);

  1645.                     skip_bits_long(&s->gb, num_dec_ch * 5); // remap codes

  1646.                 }

  1647.             }

  1648. 

  1649.         } else {

  1650.             skip_bits(&s->gb, 3); // representation type

  1651.         }

  1652.     }

  1653. 

  1654.     drc_code_present = get_bits1(&s->gb);

  1655.     if (drc_code_present)

  1656.         get_bits(&s->gb, 8); // drc code

  1657. 

  1658.     if (get_bits1(&s->gb))

  1659.         skip_bits(&s->gb, 5); // dialog normalization code

  1660. 

  1661.     if (drc_code_present && embedded_stereo)

  1662.         get_bits(&s->gb, 8); // drc stereo code

  1663. 

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

  1665.         skip_bits(&s->gb, 1); // external mix

  1666.         skip_bits(&s->gb, 6); // post mix gain code

  1667. 

  1668.         if (get_bits(&s->gb, 2) != 3) // mixer drc code

  1669.             skip_bits(&s->gb, 3); // drc limit

  1670.         else

  1671.             skip_bits(&s->gb, 8); // custom drc code

  1672. 

  1673.         if (get_bits1(&s->gb)) // channel specific scaling

  1674.             for (i = 0; i < s->num_mix_configs; i++)

  1675.                 skip_bits_long(&s->gb, s->mix_config_num_ch[i] * 6); // scale codes

  1676.         else

  1677.             skip_bits_long(&s->gb, s->num_mix_configs * 6); // scale codes

  1678. 

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

  1680.             if (get_bits_left(&s->gb) < 0)

  1681.                 return -1;

  1682.             dca_exss_skip_mix_coeffs(&s->gb, channels, s->mix_config_num_ch[i]);

  1683.             if (embedded_6ch)

  1684.                 dca_exss_skip_mix_coeffs(&s->gb, 6, s->mix_config_num_ch[i]);

  1685.             if (embedded_stereo)

  1686.                 dca_exss_skip_mix_coeffs(&s->gb, 2, s->mix_config_num_ch[i]);

  1687.         }

  1688.     }

  1689. 

  1690.     switch (get_bits(&s->gb, 2)) {

  1691.     case 0: extensions_mask = get_bits(&s->gb, 12); break;

  1692.     case 1: extensions_mask = DCA_EXT_EXSS_XLL;     break;

  1693.     case 2: extensions_mask = DCA_EXT_EXSS_LBR;     break;

  1694.     case 3: extensions_mask = 0; /* aux coding */   break;

  1695.     }

  1696. 

  1697.     /* not parsed further, we were only interested in the extensions mask */

  1698. 

  1699.     if (get_bits_left(&s->gb) < 0)

  1700.         return -1;

  1701. 

  1702.     if (get_bits_count(&s->gb) - header_pos > header_size * 8) {

  1703.         av_log(s->avctx, AV_LOG_WARNING, "Asset header size mismatch.\n");

  1704.         return -1;

  1705.     }

  1706.     skip_bits_long(&s->gb, header_pos + header_size * 8 - get_bits_count(&s->gb));

  1707. 

  1708.     if (extensions_mask & DCA_EXT_EXSS_XLL)

  1709.         s->profile = FF_PROFILE_DTS_HD_MA;

  1710.     else if (extensions_mask & (DCA_EXT_EXSS_XBR | DCA_EXT_EXSS_X96 |

  1711.                                 DCA_EXT_EXSS_XXCH))

  1712.         s->profile = FF_PROFILE_DTS_HD_HRA;

  1713. 

  1714.     if (!(extensions_mask & DCA_EXT_CORE))

  1715.         av_log(s->avctx, AV_LOG_WARNING, "DTS core detection mismatch.\n");

  1716.     if ((extensions_mask & DCA_CORE_EXTS) != s->core_ext_mask)

  1717.         av_log(s->avctx, AV_LOG_WARNING,

  1718.                "DTS extensions detection mismatch (%d, %d)\n",

  1719.                extensions_mask & DCA_CORE_EXTS, s->core_ext_mask);

  1720. 

  1721.     return 0;

  1722. }

  1723. 

  1724. static int dca_xbr_parse_frame(DCAContext *s)

  1725. {

  1726.     int scale_table_high[DCA_CHSET_CHANS_MAX][DCA_SUBBANDS][2];

  1727.     int active_bands[DCA_CHSETS_MAX][DCA_CHSET_CHANS_MAX];

  1728.     int abits_high[DCA_CHSET_CHANS_MAX][DCA_SUBBANDS];

  1729.     int anctemp[DCA_CHSET_CHANS_MAX];

  1730.     int chset_fsize[DCA_CHSETS_MAX];

  1731.     int n_xbr_ch[DCA_CHSETS_MAX];

  1732.     int hdr_size, num_chsets, xbr_tmode, hdr_pos;

  1733.     int i, j, k, l, chset, chan_base;

  1734. 

  1735.     av_log(s->avctx, AV_LOG_DEBUG, "DTS-XBR: decoding XBR extension\n");

  1736. 

  1737.     /* get bit position of sync header */

  1738.     hdr_pos = get_bits_count(&s->gb) - 32;

  1739. 

  1740.     hdr_size = get_bits(&s->gb, 6) + 1;

  1741.     num_chsets = get_bits(&s->gb, 2) + 1;

  1742. 

  1743.     for(i = 0; i < num_chsets; i++)

  1744.         chset_fsize[i] = get_bits(&s->gb, 14) + 1;

  1745. 

  1746.     xbr_tmode = get_bits1(&s->gb);

  1747. 

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

  1749.         n_xbr_ch[i] = get_bits(&s->gb, 3) + 1;

  1750.         k = get_bits(&s->gb, 2) + 5;

  1751.         for(j = 0; j < n_xbr_ch[i]; j++)

  1752.             active_bands[i][j] = get_bits(&s->gb, k) + 1;

  1753.     }

  1754. 

  1755.     /* skip to the end of the header */

  1756.     i = get_bits_count(&s->gb);

  1757.     if(hdr_pos + hdr_size * 8 > i)

  1758.         skip_bits_long(&s->gb, hdr_pos + hdr_size * 8 - i);

  1759. 

  1760.     /* loop over the channel data sets */

  1761.     /* only decode as many channels as we've decoded base data for */

  1762.     for(chset = 0, chan_base = 0;

  1763.         chset < num_chsets && chan_base + n_xbr_ch[chset] <= s->prim_channels;

  1764.         chan_base += n_xbr_ch[chset++]) {

  1765.         int start_posn = get_bits_count(&s->gb);

  1766.         int subsubframe = 0;

  1767.         int subframe = 0;

  1768. 

  1769.         /* loop over subframes */

  1770.         for (k = 0; k < (s->sample_blocks / 8); k++) {

  1771.             /* parse header if we're on first subsubframe of a block */

  1772.             if(subsubframe == 0) {

  1773.                 /* Parse subframe header */

  1774.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1775.                     anctemp[i] = get_bits(&s->gb, 2) + 2;

  1776.                 }

  1777. 

  1778.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1779.                     get_array(&s->gb, abits_high[i], active_bands[chset][i], anctemp[i]);

  1780.                 }

  1781. 

  1782.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1783.                     anctemp[i] = get_bits(&s->gb, 3);

  1784.                     if(anctemp[i] < 1) {

  1785.                         av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: SYNC ERROR\n");

  1786.                         return AVERROR_INVALIDDATA;

  1787.                     }

  1788.                 }

  1789. 

  1790.                 /* generate scale factors */

  1791.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1792.                     const uint32_t *scale_table;

  1793.                     int nbits;

  1794. 

  1795.                     if (s->scalefactor_huffman[chan_base+i] == 6) {

  1796.                         scale_table = scale_factor_quant7;

  1797.                     } else {

  1798.                         scale_table = scale_factor_quant6;

  1799.                     }

  1800. 

  1801.                     nbits = anctemp[i];

  1802. 

  1803.                     for(j = 0; j < active_bands[chset][i]; j++) {

  1804.                         if(abits_high[i][j] > 0) {

  1805.                             scale_table_high[i][j][0] =

  1806.                                 scale_table[get_bits(&s->gb, nbits)];

  1807. 

  1808.                             if(xbr_tmode && s->transition_mode[i][j]) {

  1809.                                 scale_table_high[i][j][1] =

  1810.                                     scale_table[get_bits(&s->gb, nbits)];

  1811.                             }

  1812.                         }

  1813.                     }

  1814.                 }

  1815.             }

  1816. 

  1817.             /* decode audio array for this block */

  1818.             for(i = 0; i < n_xbr_ch[chset]; i++) {

  1819.                 for(j = 0; j < active_bands[chset][i]; j++) {

  1820.                     const int xbr_abits = abits_high[i][j];

  1821.                     const float quant_step_size = lossless_quant_d[xbr_abits];

  1822.                     const int sfi = xbr_tmode && s->transition_mode[i][j] && subsubframe >= s->transition_mode[i][j];

  1823.                     const float rscale = quant_step_size * scale_table_high[i][j][sfi];

  1824.                     float *subband_samples = s->subband_samples[k][chan_base+i][j];

  1825.                     int block[8];

  1826. 

  1827.                     if(xbr_abits <= 0)

  1828.                         continue;

  1829. 

  1830.                     if(xbr_abits > 7) {

  1831.                         get_array(&s->gb, block, 8, xbr_abits - 3);

  1832.                     } else {

  1833.                         int block_code1, block_code2, size, levels, err;

  1834. 

  1835.                         size   = abits_sizes[xbr_abits - 1];

  1836.                         levels = abits_levels[xbr_abits - 1];

  1837. 

  1838.                         block_code1 = get_bits(&s->gb, size);

  1839.                         block_code2 = get_bits(&s->gb, size);

  1840.                         err = decode_blockcodes(block_code1, block_code2,

  1841.                                                 levels, block);

  1842.                         if (err) {

  1843.                             av_log(s->avctx, AV_LOG_ERROR,

  1844.                                    "ERROR: DTS-XBR: block code look-up failed\n");

  1845.                             return AVERROR_INVALIDDATA;

  1846.                         }

  1847.                     }

  1848. 

  1849.                     /* scale & sum into subband */

  1850.                     for(l = 0; l < 8; l++)

  1851.                         subband_samples[l] += (float)block[l] * rscale;

  1852.                 }

  1853.             }

  1854. 

  1855.             /* check DSYNC marker */

  1856.             if(s->aspf || subsubframe == s->subsubframes[subframe] - 1) {

  1857.                 if(get_bits(&s->gb, 16) != 0xffff) {

  1858.                     av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: Didn't get subframe DSYNC\n");

  1859.                     return AVERROR_INVALIDDATA;

  1860.                 }

  1861.             }

  1862. 

  1863.             /* advance sub-sub-frame index */

  1864.             if(++subsubframe >= s->subsubframes[subframe]) {

  1865.                 subsubframe = 0;

  1866.                 subframe++;

  1867.             }

  1868.         }

  1869. 

  1870.         /* skip to next channel set */

  1871.         i = get_bits_count(&s->gb);

  1872.         if(start_posn + chset_fsize[chset] * 8 != i) {

  1873.             j = start_posn + chset_fsize[chset] * 8 - i;

  1874.             if(j < 0 || j >= 8)

  1875.                 av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: end of channel set,"

  1876.                        " skipping further than expected (%d bits)\n", j);

  1877.             skip_bits_long(&s->gb, j);

  1878.         }

  1879.     }

  1880. 

  1881.     return 0;

  1882. }

  1883. 

  1884. /* parse initial header for XXCH and dump details */

  1885. static int dca_xxch_decode_frame(DCAContext *s)

  1886. {

  1887.     int hdr_size, spkmsk_bits, num_chsets, core_spk, hdr_pos;

  1888.     int i, chset, base_channel, chstart, fsize[8];

  1889. 

  1890.     /* assume header word has already been parsed */

  1891.     hdr_pos     = get_bits_count(&s->gb) - 32;

  1892.     hdr_size    = get_bits(&s->gb, 6) + 1;

  1893.   /*chhdr_crc   =*/ skip_bits1(&s->gb);

  1894.     spkmsk_bits = get_bits(&s->gb, 5) + 1;

  1895.     num_chsets  = get_bits(&s->gb, 2) + 1;

  1896. 

  1897.     for (i = 0; i < num_chsets; i++)

  1898.         fsize[i] = get_bits(&s->gb, 14) + 1;

  1899. 

  1900.     core_spk               = get_bits(&s->gb, spkmsk_bits);

  1901.     s->xxch_core_spkmask   = core_spk;

  1902.     s->xxch_nbits_spk_mask = spkmsk_bits;

  1903.     s->xxch_downmix        = 0;

  1904.     s->xxch_dmix_embedded  = 0;

  1905. 

  1906.     /* skip to the end of the header */

  1907.     i = get_bits_count(&s->gb);

  1908.     if (hdr_pos + hdr_size * 8 > i)

  1909.         skip_bits_long(&s->gb, hdr_pos + hdr_size * 8 - i);

  1910. 

  1911.     for (chset = 0; chset < num_chsets; chset++) {

  1912.         chstart       = get_bits_count(&s->gb);

  1913.         base_channel  = s->prim_channels;

  1914.         s->xxch_chset = chset;

  1915. 

  1916.         /* XXCH and Core headers differ, see 6.4.2 "XXCH Channel Set Header" vs.

  1917.            5.3.2 "Primary Audio Coding Header", DTS Spec 1.3.1 */

  1918.         dca_parse_audio_coding_header(s, base_channel, 1);

  1919. 

  1920.         /* decode channel data */

  1921.         for (i = 0; i < (s->sample_blocks / 8); i++) {

  1922.             if (dca_decode_block(s, base_channel, i)) {

  1923.                 av_log(s->avctx, AV_LOG_ERROR,

  1924.                        "Error decoding DTS-XXCH extension\n");

  1925.                 continue;

  1926.             }

  1927.         }

  1928. 

  1929.         /* skip to end of this section */

  1930.         i = get_bits_count(&s->gb);

  1931.         if (chstart + fsize[chset] * 8 > i)

  1932.             skip_bits_long(&s->gb, chstart + fsize[chset] * 8 - i);

  1933.     }

  1934.     s->xxch_chset = num_chsets;

  1935. 

  1936.     return 0;

  1937. }

  1938. 

  1939. /**

  1940.  * Parse extension substream header (HD)

  1941.  */

  1942. static void dca_exss_parse_header(DCAContext *s)

  1943. {

  1944.     int asset_size[8];

  1945.     int ss_index;

  1946.     int blownup;

  1947.     int num_audiop = 1;

  1948.     int num_assets = 1;

  1949.     int active_ss_mask[8];

  1950.     int i, j;

  1951.     int start_posn;

  1952.     int hdrsize;

  1953.     uint32_t mkr;

  1954. 

  1955.     if (get_bits_left(&s->gb) < 52)

  1956.         return;

  1957. 

  1958.     start_posn = get_bits_count(&s->gb) - 32;

  1959. 

  1960.     skip_bits(&s->gb, 8); // user data

  1961.     ss_index = get_bits(&s->gb, 2);

  1962. 

  1963.     blownup = get_bits1(&s->gb);

  1964.     hdrsize = get_bits(&s->gb,  8 + 4 * blownup) + 1; // header_size

  1965.     skip_bits(&s->gb, 16 + 4 * blownup); // hd_size

  1966. 

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

  1968.     if (s->static_fields) {

  1969.         skip_bits(&s->gb, 2); // reference clock code

  1970.         skip_bits(&s->gb, 3); // frame duration code

  1971. 

  1972.         if (get_bits1(&s->gb))

  1973.             skip_bits_long(&s->gb, 36); // timestamp

  1974. 

  1975.         /* a single stream can contain multiple audio assets that can be

  1976.          * combined to form multiple audio presentations */

  1977. 

  1978.         num_audiop = get_bits(&s->gb, 3) + 1;

  1979.         if (num_audiop > 1) {

  1980.             av_log_ask_for_sample(s->avctx, "Multiple DTS-HD audio presentations.");

  1981.             /* ignore such streams for now */

  1982.             return;

  1983.         }

  1984. 

  1985.         num_assets = get_bits(&s->gb, 3) + 1;

  1986.         if (num_assets > 1) {

  1987.             av_log_ask_for_sample(s->avctx, "Multiple DTS-HD audio assets.");

  1988.             /* ignore such streams for now */

  1989.             return;

  1990.         }

  1991. 

  1992.         for (i = 0; i < num_audiop; i++)

  1993.             active_ss_mask[i] = get_bits(&s->gb, ss_index + 1);

  1994. 

  1995.         for (i = 0; i < num_audiop; i++)

  1996.             for (j = 0; j <= ss_index; j++)

  1997.                 if (active_ss_mask[i] & (1 << j))

  1998.                     skip_bits(&s->gb, 8); // active asset mask

  1999. 

  2000.         s->mix_metadata = get_bits1(&s->gb);

  2001.         if (s->mix_metadata) {

  2002.             int mix_out_mask_size;

  2003. 

  2004.             skip_bits(&s->gb, 2); // adjustment level

  2005.             mix_out_mask_size  = (get_bits(&s->gb, 2) + 1) << 2;

  2006.             s->num_mix_configs =  get_bits(&s->gb, 2) + 1;

  2007. 

  2008.             for (i = 0; i < s->num_mix_configs; i++) {

  2009.                 int mix_out_mask        = get_bits(&s->gb, mix_out_mask_size);

  2010.                 s->mix_config_num_ch[i] = dca_exss_mask2count(mix_out_mask);

  2011.             }

  2012.         }

  2013.     }

  2014. 

  2015.     for (i = 0; i < num_assets; i++)

  2016.         asset_size[i] = get_bits_long(&s->gb, 16 + 4 * blownup);

  2017. 

  2018.     for (i = 0; i < num_assets; i++) {

  2019.         if (dca_exss_parse_asset_header(s))

  2020.             return;

  2021.     }

  2022. 

  2023.     /* not parsed further, we were only interested in the extensions mask

  2024.      * from the asset header */

  2025. 

  2026.     if (num_assets > 0) {

  2027.         j = get_bits_count(&s->gb);

  2028.         if (start_posn + hdrsize * 8 > j)

  2029.             skip_bits_long(&s->gb, start_posn + hdrsize * 8 - j);

  2030. 

  2031.         for (i = 0; i < num_assets; i++) {

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

  2033.             mkr        = get_bits_long(&s->gb, 32);

  2034. 

  2035.             /* parse extensions that we know about */

  2036.             if (mkr == 0x655e315e) {

  2037.                 dca_xbr_parse_frame(s);

  2038.             } else if (mkr == 0x47004a03) {

  2039.                 dca_xxch_decode_frame(s);

  2040.                 s->core_ext_mask |= DCA_EXT_XXCH; /* xxx use for chan reordering */

  2041.             } else {

  2042.                 av_log(s->avctx, AV_LOG_DEBUG,

  2043.                        "DTS-ExSS: unknown marker = 0x%08x\n", mkr);

  2044.             }

  2045. 

  2046.             /* skip to end of block */

  2047.             j = get_bits_count(&s->gb);

  2048.             if (start_posn + asset_size[i] * 8 > j)

  2049.                 skip_bits_long(&s->gb, start_posn + asset_size[i] * 8 - j);

  2050.         }

  2051.     }

  2052. }

  2053. 

  2054. /**

  2055.  * Main frame decoding function

  2056.  * FIXME add arguments

  2057.  */

  2058. static int dca_decode_frame(AVCodecContext *avctx, void *data,

  2059.                             int *got_frame_ptr, AVPacket *avpkt)

  2060. {

  2061.     const uint8_t *buf = avpkt->data;

  2062.     int buf_size = avpkt->size;

  2063.     int channel_mask;

  2064.     int channel_layout;

  2065.     int lfe_samples;

  2066.     int num_core_channels = 0;

  2067.     int i, ret;

  2068.     float **samples_flt;

  2069.     float *src_chan;

  2070.     float *dst_chan;

  2071.     DCAContext *s = avctx->priv_data;

  2072.     int core_ss_end;

  2073.     int channels;

  2074.     float scale;

  2075.     int achan;

  2076.     int chset;

  2077.     int mask;

  2078.     int lavc;

  2079.     int posn;

  2080.     int j, k;

  2081.     int endch;

  2082. 

  2083.     s->xch_present = 0;

  2084. 

  2085.     s->dca_buffer_size = ff_dca_convert_bitstream(buf, buf_size, s->dca_buffer,

  2086.                                                   DCA_MAX_FRAME_SIZE + DCA_MAX_EXSS_HEADER_SIZE);

  2087.     if (s->dca_buffer_size == AVERROR_INVALIDDATA) {

  2088.         av_log(avctx, AV_LOG_ERROR, "Not a valid DCA frame\n");

  2089.         return AVERROR_INVALIDDATA;

  2090.     }

  2091. 

  2092.     init_get_bits(&s->gb, s->dca_buffer, s->dca_buffer_size * 8);

  2093.     if ((ret = dca_parse_frame_header(s)) < 0) {

  2094.         //seems like the frame is corrupt, try with the next one

  2095.         return ret;

  2096.     }

  2097.     //set AVCodec values with parsed data

  2098.     avctx->sample_rate = s->sample_rate;

  2099.     avctx->bit_rate    = s->bit_rate;

  2100. 

  2101.     s->profile = FF_PROFILE_DTS;

  2102. 

  2103.     for (i = 0; i < (s->sample_blocks / 8); i++) {

  2104.         if ((ret = dca_decode_block(s, 0, i))) {

  2105.             av_log(avctx, AV_LOG_ERROR, "error decoding block\n");

  2106.             return ret;

  2107.         }

  2108.     }

  2109. 

  2110.     /* record number of core channels incase less than max channels are requested */

  2111.     num_core_channels = s->prim_channels;

  2112. 

  2113.     if (s->ext_coding)

  2114.         s->core_ext_mask = dca_ext_audio_descr_mask[s->ext_descr];

  2115.     else

  2116.         s->core_ext_mask = 0;

  2117. 

  2118.     core_ss_end = FFMIN(s->frame_size, s->dca_buffer_size) * 8;

  2119. 

  2120.     /* only scan for extensions if ext_descr was unknown or indicated a

  2121.      * supported XCh extension */

  2122.     if (s->core_ext_mask < 0 || s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH)) {

  2123. 

  2124.         /* if ext_descr was unknown, clear s->core_ext_mask so that the

  2125.          * extensions scan can fill it up */

  2126.         s->core_ext_mask = FFMAX(s->core_ext_mask, 0);

  2127. 

  2128.         /* extensions start at 32-bit boundaries into bitstream */

  2129.         skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);

  2130. 

  2131.         while (core_ss_end - get_bits_count(&s->gb) >= 32) {

  2132.             uint32_t bits = get_bits_long(&s->gb, 32);

  2133. 

  2134.             switch (bits) {

  2135.             case 0x5a5a5a5a: {

  2136.                 int ext_amode, xch_fsize;

  2137. 

  2138.                 s->xch_base_channel = s->prim_channels;

  2139. 

  2140.                 /* validate sync word using XCHFSIZE field */

  2141.                 xch_fsize = show_bits(&s->gb, 10);

  2142.                 if ((s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize) &&

  2143.                     (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize + 1))

  2144.                     continue;

  2145. 

  2146.                 /* skip length-to-end-of-frame field for the moment */

  2147.                 skip_bits(&s->gb, 10);

  2148. 

  2149.                 s->core_ext_mask |= DCA_EXT_XCH;

  2150. 

  2151.                 /* extension amode(number of channels in extension) should be 1 */

  2152.                 /* AFAIK XCh is not used for more channels */

  2153.                 if ((ext_amode = get_bits(&s->gb, 4)) != 1) {

  2154.                     av_log(avctx, AV_LOG_ERROR, "XCh extension amode %d not"

  2155.                            " supported!\n", ext_amode);

  2156.                     continue;

  2157.                 }

  2158. 

  2159.                 /* much like core primary audio coding header */

  2160.                 dca_parse_audio_coding_header(s, s->xch_base_channel, 0);

  2161. 

  2162.                 for (i = 0; i < (s->sample_blocks / 8); i++)

  2163.                     if ((ret = dca_decode_block(s, s->xch_base_channel, i))) {

  2164.                         av_log(avctx, AV_LOG_ERROR, "error decoding XCh extension\n");

  2165.                         continue;

  2166.                     }

  2167. 

  2168.                 s->xch_present = 1;

  2169.                 break;

  2170.             }

  2171.             case 0x47004a03:

  2172.                 /* XXCh: extended channels */

  2173.                 /* usually found either in core or HD part in DTS-HD HRA streams,

  2174.                  * but not in DTS-ES which contains XCh extensions instead */

  2175.                 s->core_ext_mask |= DCA_EXT_XXCH;

  2176.                 dca_xxch_decode_frame(s);

  2177.                 break;

  2178. 

  2179.             case 0x1d95f262: {

  2180.                 int fsize96 = show_bits(&s->gb, 12) + 1;

  2181.                 if (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + fsize96)

  2182.                     continue;

  2183. 

  2184.                 av_log(avctx, AV_LOG_DEBUG, "X96 extension found at %d bits\n",

  2185.                        get_bits_count(&s->gb));

  2186.                 skip_bits(&s->gb, 12);

  2187.                 av_log(avctx, AV_LOG_DEBUG, "FSIZE96 = %d bytes\n", fsize96);

  2188.                 av_log(avctx, AV_LOG_DEBUG, "REVNO = %d\n", get_bits(&s->gb, 4));

  2189. 

  2190.                 s->core_ext_mask |= DCA_EXT_X96;

  2191.                 break;

  2192.             }

  2193.             }

  2194. 

  2195.             skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);

  2196.         }

  2197.     } else {

  2198.         /* no supported extensions, skip the rest of the core substream */

  2199.         skip_bits_long(&s->gb, core_ss_end - get_bits_count(&s->gb));

  2200.     }

  2201. 

  2202.     if (s->core_ext_mask & DCA_EXT_X96)

  2203.         s->profile = FF_PROFILE_DTS_96_24;

  2204.     else if (s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH))

  2205.         s->profile = FF_PROFILE_DTS_ES;

  2206. 

  2207.     /* check for ExSS (HD part) */

  2208.     if (s->dca_buffer_size - s->frame_size > 32 &&

  2209.         get_bits_long(&s->gb, 32) == DCA_HD_MARKER)

  2210.         dca_exss_parse_header(s);

  2211. 

  2212.     avctx->profile = s->profile;

  2213. 

  2214.     channels = s->prim_channels + !!s->lfe;

  2215. 

  2216.     /* If we have XXCH then the channel layout is managed differently */

  2217.     /* note that XLL will also have another way to do things */

  2218.     if (!(s->core_ext_mask & DCA_EXT_XXCH)

  2219.         || (s->core_ext_mask & DCA_EXT_XXCH && avctx->request_channels > 0

  2220.             && avctx->request_channels

  2221.             < num_core_channels + !!s->lfe + s->xxch_chset_nch[0]))

  2222.     { /* xxx should also do MA extensions */

  2223.         if (s->amode < 16) {

  2224.             avctx->channel_layout = dca_core_channel_layout[s->amode];

  2225. 

  2226.             if (s->xch_present && (!avctx->request_channels ||

  2227.                                    avctx->request_channels

  2228.                                    > num_core_channels + !!s->lfe)) {

  2229.                 avctx->channel_layout |= AV_CH_BACK_CENTER;

  2230.                 if (s->lfe) {

  2231.                     avctx->channel_layout |= AV_CH_LOW_FREQUENCY;

  2232.                     s->channel_order_tab = dca_channel_reorder_lfe_xch[s->amode];

  2233.                 } else {

  2234.                     s->channel_order_tab = dca_channel_reorder_nolfe_xch[s->amode];

  2235.                 }

  2236.             } else {

  2237.                 channels = num_core_channels + !!s->lfe;

  2238.                 s->xch_present = 0; /* disable further xch processing */

  2239.                 if (s->lfe) {

  2240.                     avctx->channel_layout |= AV_CH_LOW_FREQUENCY;

  2241.                     s->channel_order_tab = dca_channel_reorder_lfe[s->amode];

  2242.                 } else

  2243.                     s->channel_order_tab = dca_channel_reorder_nolfe[s->amode];

  2244.             }

  2245. 

  2246.             if (channels > !!s->lfe &&

  2247.                 s->channel_order_tab[channels - 1 - !!s->lfe] < 0)

  2248.                 return AVERROR_INVALIDDATA;

  2249. 

  2250.             if (avctx->request_channels == 2 && s->prim_channels > 2) {

  2251.                 channels = 2;

  2252.                 s->output = DCA_STEREO;

  2253.                 avctx->channel_layout = AV_CH_LAYOUT_STEREO;

  2254.             }

  2255.             else if (avctx->request_channel_layout & AV_CH_LAYOUT_NATIVE) {

  2256.                 static const int8_t dca_channel_order_native[9] = { 0, 1, 2, 3, 4, 5, 6, 7, 8 };

  2257.                 s->channel_order_tab = dca_channel_order_native;

  2258.             }

  2259.             s->lfe_index = dca_lfe_index[s->amode];

  2260.         } else {

  2261.             av_log(avctx, AV_LOG_ERROR,

  2262.                    "Non standard configuration %d !\n", s->amode);

  2263.             return AVERROR_INVALIDDATA;

  2264.         }

  2265. 

  2266.         s->xxch_downmix = 0;

  2267.     } else {

  2268.         /* we only get here if an XXCH channel set can be added to the mix */

  2269.         channel_mask = s->xxch_core_spkmask;

  2270. 

  2271.         if (avctx->request_channels > 0

  2272.             && avctx->request_channels < s->prim_channels) {

  2273.             channels = num_core_channels + !!s->lfe;

  2274.             for (i = 0; i < s->xxch_chset && channels + s->xxch_chset_nch[i]

  2275.                                               <= avctx->request_channels; i++) {

  2276.                 channels += s->xxch_chset_nch[i];

  2277.                 channel_mask |= s->xxch_spk_masks[i];

  2278.             }

  2279.         } else {

  2280.             channels = s->prim_channels + !!s->lfe;

  2281.             for (i = 0; i < s->xxch_chset; i++) {

  2282.                 channel_mask |= s->xxch_spk_masks[i];

  2283.             }

  2284.         }

  2285. 

  2286.         /* Given the DTS spec'ed channel mask, generate an avcodec version */

  2287.         channel_layout = 0;

  2288.         for (i = 0; i < s->xxch_nbits_spk_mask; ++i) {

  2289.             if (channel_mask & (1 << i)) {

  2290.                 channel_layout |= map_xxch_to_native[i];

  2291.             }

  2292.         }

  2293. 

  2294.         /* make sure that we have managed to get equivelant dts/avcodec channel

  2295.          * masks in some sense -- unfortunately some channels could overlap */

  2296.         if (av_popcount(channel_mask) != av_popcount(channel_layout)) {

  2297.             av_log(avctx, AV_LOG_DEBUG,

  2298.                    "DTS-XXCH: Inconsistant avcodec/dts channel layouts\n");

  2299.             return AVERROR_INVALIDDATA;

  2300.         }

  2301. 

  2302.         avctx->channel_layout = channel_layout;

  2303. 

  2304.         if (!(avctx->request_channel_layout & AV_CH_LAYOUT_NATIVE)) {

  2305.             /* Estimate DTS --> avcodec ordering table */

  2306.             for (chset = -1, j = 0; chset < s->xxch_chset; ++chset) {

  2307.                 mask = chset >= 0 ? s->xxch_spk_masks[chset]

  2308.                                   : s->xxch_core_spkmask;

  2309.                 for (i = 0; i < s->xxch_nbits_spk_mask; i++) {

  2310.                     if (mask & ~(DCA_XXCH_LFE1 | DCA_XXCH_LFE2) & (1 << i)) {

  2311.                         lavc = map_xxch_to_native[i];

  2312.                         posn = av_popcount(channel_layout & (lavc - 1));

  2313.                         s->xxch_order_tab[j++] = posn;

  2314.                     }

  2315.                 }

  2316.             }

  2317. 

  2318.             s->lfe_index = av_popcount(channel_layout & (AV_CH_LOW_FREQUENCY-1));

  2319.         } else { /* native ordering */

  2320.             for (i = 0; i < channels; i++)

  2321.                 s->xxch_order_tab[i] = i;

  2322. 

  2323.             s->lfe_index = channels - 1;

  2324.         }

  2325. 

  2326.         s->channel_order_tab = s->xxch_order_tab;

  2327.     }

  2328. 

  2329.     if (avctx->channels != channels) {

  2330.         if (avctx->channels)

  2331.             av_log(avctx, AV_LOG_INFO, "Number of channels changed in DCA decoder (%d -> %d)\n", avctx->channels, channels);

  2332.         avctx->channels = channels;

  2333.     }

  2334. 

  2335.     /* get output buffer */

  2336.     s->frame.nb_samples = 256 * (s->sample_blocks / 8);

  2337.     if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {

  2338.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  2339.         return ret;

  2340.     }

  2341.     samples_flt = (float  **) s->frame.extended_data;

  2342. 

  2343.     /* filter to get final output */

  2344.     for (i = 0; i < (s->sample_blocks / 8); i++) {

  2345.         int ch;

  2346. 

  2347.         for (ch = 0; ch < channels; ch++)

  2348.             s->samples_chanptr[ch] = samples_flt[ch] + i * 256;

  2349. 

  2350.         dca_filter_channels(s, i);

  2351. 

  2352.         /* If this was marked as a DTS-ES stream we need to subtract back- */

  2353.         /* channel from SL & SR to remove matrixed back-channel signal */

  2354.         if ((s->source_pcm_res & 1) && s->xch_present) {

  2355.             float *back_chan = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel]];

  2356.             float *lt_chan   = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel - 2]];

  2357.             float *rt_chan   = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel - 1]];

  2358.             s->fdsp.vector_fmac_scalar(lt_chan, back_chan, -M_SQRT1_2, 256);

  2359.             s->fdsp.vector_fmac_scalar(rt_chan, back_chan, -M_SQRT1_2, 256);

  2360.         }

  2361. 

  2362.         /* If stream contains XXCH, we might need to undo an embedded downmix */

  2363.         if (s->xxch_dmix_embedded) {

  2364.             /* Loop over channel sets in turn */

  2365.             ch = num_core_channels;

  2366.             for (chset = 0; chset < s->xxch_chset; chset++) {

  2367.                 endch = ch + s->xxch_chset_nch[chset];

  2368.                 mask = s->xxch_dmix_embedded;

  2369. 

  2370.                 /* undo downmix */

  2371.                 for (j = ch; j < endch; j++) {

  2372.                     if (mask & (1 << j)) { /* this channel has been mixed-out */

  2373.                         src_chan = s->samples_chanptr[s->channel_order_tab[j]];

  2374.                         for (k = 0; k < endch; k++) {

  2375.                             achan = s->channel_order_tab[k];

  2376.                             scale = s->xxch_dmix_coeff[j][k];

  2377.                             if (scale != 0.0) {

  2378.                                 dst_chan = s->samples_chanptr[achan];

  2379.                                 s->fdsp.vector_fmac_scalar(dst_chan, src_chan,

  2380.                                                            -scale, 256);

  2381.                             }

  2382.                         }

  2383.                     }

  2384.                 }

  2385. 

  2386.                 /* if a downmix has been embedded then undo the pre-scaling */

  2387.                 if ((mask & (1 << ch)) && s->xxch_dmix_sf[chset] != 1.0f) {

  2388.                     scale = s->xxch_dmix_sf[chset];

  2389. 

  2390.                     for (j = 0; j < ch; j++) {

  2391.                         src_chan = s->samples_chanptr[s->channel_order_tab[j]];

  2392.                         for (k = 0; k < 256; k++)

  2393.                             src_chan[k] *= scale;

  2394.                     }

  2395. 

  2396.                     /* LFE channel is always part of core, scale if it exists */

  2397.                     if (s->lfe) {

  2398.                         src_chan = s->samples_chanptr[s->lfe_index];

  2399.                         for (k = 0; k < 256; k++)

  2400.                             src_chan[k] *= scale;

  2401.                     }

  2402.                 }

  2403. 

  2404.                 ch = endch;

  2405.             }

  2406. 

  2407.         }

  2408.     }

  2409. 

  2410.     /* update lfe history */

  2411.     lfe_samples = 2 * s->lfe * (s->sample_blocks / 8);

  2412.     for (i = 0; i < 2 * s->lfe * 4; i++)

  2413.         s->lfe_data[i] = s->lfe_data[i + lfe_samples];

  2414. 

  2415.     *got_frame_ptr    = 1;

  2416.     *(AVFrame *) data = s->frame;

  2417. 

  2418.     return buf_size;

  2419. }

  2420. 

  2421. 

  2422. 

  2423. /**

  2424.  * DCA initialization

  2425.  *

  2426.  * @param avctx     pointer to the AVCodecContext

  2427.  */

  2428. 

  2429. static av_cold int dca_decode_init(AVCodecContext *avctx)

  2430. {

  2431.     DCAContext *s = avctx->priv_data;

  2432. 

  2433.     s->avctx = avctx;

  2434.     dca_init_vlcs();

  2435. 

  2436.     avpriv_float_dsp_init(&s->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);

  2437.     ff_mdct_init(&s->imdct, 6, 1, 1.0);

  2438.     ff_synth_filter_init(&s->synth);

  2439.     ff_dcadsp_init(&s->dcadsp);

  2440.     ff_fmt_convert_init(&s->fmt_conv, avctx);

  2441. 

  2442.     avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;

  2443. 

  2444.     /* allow downmixing to stereo */

  2445.     if (avctx->channels > 0 && avctx->request_channels < avctx->channels &&

  2446.         avctx->request_channels == 2) {

  2447.         avctx->channels = avctx->request_channels;

  2448.     }

  2449. 

  2450.     avcodec_get_frame_defaults(&s->frame);

  2451.     avctx->coded_frame = &s->frame;

  2452. 

  2453.     return 0;

  2454. }

  2455. 

  2456. static av_cold int dca_decode_end(AVCodecContext *avctx)

  2457. {

  2458.     DCAContext *s = avctx->priv_data;

  2459.     ff_mdct_end(&s->imdct);

  2460.     return 0;

  2461. }

  2462. 

  2463. static const AVProfile profiles[] = {

  2464.     { FF_PROFILE_DTS,        "DTS"        },

  2465.     { FF_PROFILE_DTS_ES,     "DTS-ES"     },

  2466.     { FF_PROFILE_DTS_96_24,  "DTS 96/24"  },

  2467.     { FF_PROFILE_DTS_HD_HRA, "DTS-HD HRA" },

  2468.     { FF_PROFILE_DTS_HD_MA,  "DTS-HD MA"  },

  2469.     { FF_PROFILE_UNKNOWN },

  2470. };

  2471. 

  2472. AVCodec ff_dca_decoder = {

  2473.     .name            = "dca",

  2474.     .type            = AVMEDIA_TYPE_AUDIO,

  2475.     .id              = AV_CODEC_ID_DTS,

  2476.     .priv_data_size  = sizeof(DCAContext),

  2477.     .init            = dca_decode_init,

  2478.     .decode          = dca_decode_frame,

  2479.     .close           = dca_decode_end,

  2480.     .long_name       = NULL_IF_CONFIG_SMALL("DCA (DTS Coherent Acoustics)"),

  2481.     .capabilities    = CODEC_CAP_CHANNEL_CONF | CODEC_CAP_DR1,

  2482.     .sample_fmts     = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,

  2483.                                                        AV_SAMPLE_FMT_NONE },

  2484.     .profiles        = NULL_IF_CONFIG_SMALL(profiles),

  2485. };