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FFmpeg/libavcodec/dcadec.c

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  1. /*

  2.  * DCA compatible decoder

  3.  * Copyright (C) 2004 Gildas Bazin

  4.  * Copyright (C) 2004 Benjamin Zores

  5.  * Copyright (C) 2006 Benjamin Larsson

  6.  * Copyright (C) 2007 Konstantin Shishkov

  7.  *

  8.  * This file is part of FFmpeg.

  9.  *

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

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

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

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

  14.  *

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

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

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

  18.  * Lesser General Public License for more details.

  19.  *

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

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

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

  23.  */

  24. 

  25. #include <math.h>

  26. #include <stddef.h>

  27. #include <stdio.h>

  28. 

  29. #include "libavutil/channel_layout.h"

  30. #include "libavutil/common.h"

  31. #include "libavutil/float_dsp.h"

  32. #include "libavutil/intmath.h"

  33. #include "libavutil/intreadwrite.h"

  34. #include "libavutil/mathematics.h"

  35. #include "libavutil/samplefmt.h"

  36. #include "avcodec.h"

  37. #include "dsputil.h"

  38. #include "fft.h"

  39. #include "get_bits.h"

  40. #include "put_bits.h"

  41. #include "dcadata.h"

  42. #include "dcahuff.h"

  43. #include "dca.h"

  44. #include "dca_parser.h"

  45. #include "synth_filter.h"

  46. #include "dcadsp.h"

  47. #include "fmtconvert.h"

  48. #include "internal.h"

  49. 

  50. #if ARCH_ARM

  51. #   include "arm/dca.h"

  52. #endif

  53. 

  54. //#define TRACE

  55. 

  56. #define DCA_PRIM_CHANNELS_MAX  (7)

  57. #define DCA_SUBBANDS          (64)

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

  59. #define DCA_SUBSUBFRAMES_MAX   (4)

  60. #define DCA_SUBFRAMES_MAX     (16)

  61. #define DCA_BLOCKS_MAX        (16)

  62. #define DCA_LFE_MAX            (3)

  63. #define DCA_CHSETS_MAX         (4)

  64. #define DCA_CHSET_CHANS_MAX    (8)

  65. 

  66. enum DCAMode {

  67.     DCA_MONO = 0,

  68.     DCA_CHANNEL,

  69.     DCA_STEREO,

  70.     DCA_STEREO_SUMDIFF,

  71.     DCA_STEREO_TOTAL,

  72.     DCA_3F,

  73.     DCA_2F1R,

  74.     DCA_3F1R,

  75.     DCA_2F2R,

  76.     DCA_3F2R,

  77.     DCA_4F2R

  78. };

  79. 

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

  81. enum DCAExSSSpeakerMask {

  82.     DCA_EXSS_FRONT_CENTER          = 0x0001,

  83.     DCA_EXSS_FRONT_LEFT_RIGHT      = 0x0002,

  84.     DCA_EXSS_SIDE_REAR_LEFT_RIGHT  = 0x0004,

  85.     DCA_EXSS_LFE                   = 0x0008,

  86.     DCA_EXSS_REAR_CENTER           = 0x0010,

  87.     DCA_EXSS_FRONT_HIGH_LEFT_RIGHT = 0x0020,

  88.     DCA_EXSS_REAR_LEFT_RIGHT       = 0x0040,

  89.     DCA_EXSS_FRONT_HIGH_CENTER     = 0x0080,

  90.     DCA_EXSS_OVERHEAD              = 0x0100,

  91.     DCA_EXSS_CENTER_LEFT_RIGHT     = 0x0200,

  92.     DCA_EXSS_WIDE_LEFT_RIGHT       = 0x0400,

  93.     DCA_EXSS_SIDE_LEFT_RIGHT       = 0x0800,

  94.     DCA_EXSS_LFE2                  = 0x1000,

  95.     DCA_EXSS_SIDE_HIGH_LEFT_RIGHT  = 0x2000,

  96.     DCA_EXSS_REAR_HIGH_CENTER      = 0x4000,

  97.     DCA_EXSS_REAR_HIGH_LEFT_RIGHT  = 0x8000,

  98. };

  99. 

  100. enum DCAXxchSpeakerMask {

  101.     DCA_XXCH_FRONT_CENTER          = 0x0000001,

  102.     DCA_XXCH_FRONT_LEFT            = 0x0000002,

  103.     DCA_XXCH_FRONT_RIGHT           = 0x0000004,

  104.     DCA_XXCH_SIDE_REAR_LEFT        = 0x0000008,

  105.     DCA_XXCH_SIDE_REAR_RIGHT       = 0x0000010,

  106.     DCA_XXCH_LFE1                  = 0x0000020,

  107.     DCA_XXCH_REAR_CENTER           = 0x0000040,

  108.     DCA_XXCH_SURROUND_REAR_LEFT    = 0x0000080,

  109.     DCA_XXCH_SURROUND_REAR_RIGHT   = 0x0000100,

  110.     DCA_XXCH_SIDE_SURROUND_LEFT    = 0x0000200,

  111.     DCA_XXCH_SIDE_SURROUND_RIGHT   = 0x0000400,

  112.     DCA_XXCH_FRONT_CENTER_LEFT     = 0x0000800,

  113.     DCA_XXCH_FRONT_CENTER_RIGHT    = 0x0001000,

  114.     DCA_XXCH_FRONT_HIGH_LEFT       = 0x0002000,

  115.     DCA_XXCH_FRONT_HIGH_CENTER     = 0x0004000,

  116.     DCA_XXCH_FRONT_HIGH_RIGHT      = 0x0008000,

  117.     DCA_XXCH_LFE2                  = 0x0010000,

  118.     DCA_XXCH_SIDE_FRONT_LEFT       = 0x0020000,

  119.     DCA_XXCH_SIDE_FRONT_RIGHT      = 0x0040000,

  120.     DCA_XXCH_OVERHEAD              = 0x0080000,

  121.     DCA_XXCH_SIDE_HIGH_LEFT        = 0x0100000,

  122.     DCA_XXCH_SIDE_HIGH_RIGHT       = 0x0200000,

  123.     DCA_XXCH_REAR_HIGH_CENTER      = 0x0400000,

  124.     DCA_XXCH_REAR_HIGH_LEFT        = 0x0800000,

  125.     DCA_XXCH_REAR_HIGH_RIGHT       = 0x1000000,

  126.     DCA_XXCH_REAR_LOW_CENTER       = 0x2000000,

  127.     DCA_XXCH_REAR_LOW_LEFT         = 0x4000000,

  128.     DCA_XXCH_REAR_LOW_RIGHT        = 0x8000000,

  129. };

  130. 

  131. static const uint32_t map_xxch_to_native[28] = {

  132.     AV_CH_FRONT_CENTER,

  133.     AV_CH_FRONT_LEFT,

  134.     AV_CH_FRONT_RIGHT,

  135.     AV_CH_SIDE_LEFT,

  136.     AV_CH_SIDE_RIGHT,

  137.     AV_CH_LOW_FREQUENCY,

  138.     AV_CH_BACK_CENTER,

  139.     AV_CH_BACK_LEFT,

  140.     AV_CH_BACK_RIGHT,

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

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

  143.     AV_CH_FRONT_LEFT_OF_CENTER,

  144.     AV_CH_FRONT_RIGHT_OF_CENTER,

  145.     AV_CH_TOP_FRONT_LEFT,

  146.     AV_CH_TOP_FRONT_CENTER,

  147.     AV_CH_TOP_FRONT_RIGHT,

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

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

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

  151.     AV_CH_TOP_CENTER,           /* overhead */

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

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

  154.     AV_CH_TOP_BACK_CENTER,

  155.     AV_CH_TOP_BACK_LEFT,

  156.     AV_CH_TOP_BACK_RIGHT,

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

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

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

  160. };

  161. 

  162. enum DCAExtensionMask {

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

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

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

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

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

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

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

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

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

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

  173. };

  174. 

  175. /* -1 are reserved or unknown */

  176. static const int dca_ext_audio_descr_mask[] = {

  177.     DCA_EXT_XCH,

  178.     -1,

  179.     DCA_EXT_X96,

  180.     DCA_EXT_XCH | DCA_EXT_X96,

  181.     -1,

  182.     -1,

  183.     DCA_EXT_XXCH,

  184.     -1,

  185. };

  186. 

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

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

  189. 

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

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

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

  193.  *

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

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

  196.  * OV -> center back

  197.  * All 2 channel configurations -> AV_CH_LAYOUT_STEREO

  198.  */

  199. static const uint64_t dca_core_channel_layout[] = {

  200.     AV_CH_FRONT_CENTER,                                                     ///< 1, A

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

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

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

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

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

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

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

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

  209. 

  210.     AV_CH_LAYOUT_STEREO | AV_CH_FRONT_CENTER | AV_CH_SIDE_LEFT |

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

  212. 

  213.     AV_CH_LAYOUT_STEREO | AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT |

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

  215. 

  216.     AV_CH_LAYOUT_STEREO | AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT |

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

  218. 

  219.     AV_CH_FRONT_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER |

  220.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_BACK_CENTER   |

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

  222. 

  223.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_CENTER   |

  224.     AV_CH_FRONT_RIGHT_OF_CENTER | AV_CH_LAYOUT_STEREO |

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

  226. 

  227.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER |

  228.     AV_CH_LAYOUT_STEREO | AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT |

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

  230. 

  231.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_CENTER   |

  232.     AV_CH_FRONT_RIGHT_OF_CENTER | AV_CH_LAYOUT_STEREO |

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

  234. };

  235. 

  236. static const int8_t dca_lfe_index[] = {

  237.     1, 2, 2, 2, 2, 3, 2, 3, 2, 3, 2, 3, 1, 3, 2, 3

  238. };

  239. 

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

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

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

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

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

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

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

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

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

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

  253.     { 0,  6,  4,  5,  2,  3, -1, -1, -1},

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

  255.     { 5,  6,  0,  1,  7,  3,  8,  4, -1},

  256.     { 4,  2,  5,  0,  1,  6,  8,  7, -1},

  257. };

  258. 

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

  260.     { 0,  2, -1, -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.     { 0,  1,  3, -1, -1, -1, -1, -1, -1},

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

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

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

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

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

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

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

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

  272.     { 0,  6,  4,  5,  2,  3,  7, -1, -1},

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

  274.     { 5,  6,  0,  1,  8,  3,  9,  4,  7},

  275.     { 4,  2,  5,  0,  1,  6,  9,  8,  7},

  276. };

  277. 

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

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

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

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

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

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

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

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

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

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

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

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

  293.     { 4,  5,  0,  1,  6,  2,  7,  3, -1},

  294.     { 3,  2,  4,  0,  1,  5,  7,  6, -1},

  295. };

  296. 

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

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

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

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

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

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

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

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

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

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

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

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

  312.     { 4,  5,  0,  1,  7,  2,  8,  3,  6},

  313.     { 3,  2,  4,  0,  1,  5,  8,  7,  6},

  314. };

  315. 

  316. #define DCA_DOLBY                  101           /* FIXME */

  317. 

  318. #define DCA_CHANNEL_BITS             6

  319. #define DCA_CHANNEL_MASK          0x3F

  320. 

  321. #define DCA_LFE                   0x80

  322. 

  323. #define HEADER_SIZE                 14

  324. 

  325. #define DCA_MAX_FRAME_SIZE       16384

  326. #define DCA_MAX_EXSS_HEADER_SIZE  4096

  327. 

  328. #define DCA_BUFFER_PADDING_SIZE   1024

  329. 

  330. /** Bit allocation */

  331. typedef struct {

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

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

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

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

  336. } BitAlloc;

  337. 

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

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

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

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

  342. 

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

  344.                                          int idx)

  345. {

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

  347.            ba->offset;

  348. }

  349. 

  350. typedef struct {

  351.     AVCodecContext *avctx;

  352.     AVFrame frame;

  353.     /* Frame header */

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

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

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

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

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

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

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

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

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

  363. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  377.     int copy_history;           ///< copy history

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

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

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

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

  382. 

  383.     /* Primary audio coding header */

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

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

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

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

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

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

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

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

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

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

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

  395. 

  396.     /* Primary audio coding side information */

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

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

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

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

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

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

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

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

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

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

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

  408. 

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

  410. 

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

  412.     int lfe_scale_factor;

  413. 

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

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

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

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

  418.     int hist_index[DCA_PRIM_CHANNELS_MAX];

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

  420. 

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

  422. 

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

  424.     float *samples_chanptr[DCA_PRIM_CHANNELS_MAX + 1];

  425.     float *extra_channels[DCA_PRIM_CHANNELS_MAX + 1];

  426.     uint8_t *extra_channels_buffer;

  427.     unsigned int extra_channels_buffer_size;

  428. 

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

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

  431. 

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

  433.     GetBitContext gb;

  434.     /* Current position in DCA frame */

  435.     int current_subframe;

  436.     int current_subsubframe;

  437. 

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

  439. 

  440.     /* XCh extension information */

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

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

  443. 

  444.     /* XXCH extension information */

  445.     int xxch_chset;

  446.     int xxch_nbits_spk_mask;

  447.     uint32_t xxch_core_spkmask;

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

  449.     int xxch_chset_nch[4];

  450.     float xxch_dmix_sf[DCA_CHSETS_MAX];

  451. 

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

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

  454. 

  455.     int8_t xxch_order_tab[32];

  456.     int8_t lfe_index;

  457. 

  458.     /* ExSS header parser */

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

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

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

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

  463. 

  464.     int profile;

  465. 

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

  467.     AVFloatDSPContext fdsp;

  468.     FFTContext imdct;

  469.     SynthFilterContext synth;

  470.     DCADSPContext dcadsp;

  471.     FmtConvertContext fmt_conv;

  472. } DCAContext;

  473. 

  474. static const uint16_t dca_vlc_offs[] = {

  475.         0,   512,   640,   768,  1282,  1794,  2436,  3080,  3770,  4454,  5364,

  476.      5372,  5380,  5388,  5392,  5396,  5412,  5420,  5428,  5460,  5492,  5508,

  477.      5572,  5604,  5668,  5796,  5860,  5892,  6412,  6668,  6796,  7308,  7564,

  478.      7820,  8076,  8620,  9132,  9388,  9910, 10166, 10680, 11196, 11726, 12240,

  479.     12752, 13298, 13810, 14326, 14840, 15500, 16022, 16540, 17158, 17678, 18264,

  480.     18796, 19352, 19926, 20468, 21472, 22398, 23014, 23622,

  481. };

  482. 

  483. static av_cold void dca_init_vlcs(void)

  484. {

  485.     static int vlcs_initialized = 0;

  486.     int i, j, c = 14;

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

  488. 

  489.     if (vlcs_initialized)

  490.         return;

  491. 

  492.     dca_bitalloc_index.offset = 1;

  493.     dca_bitalloc_index.wrap = 2;

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

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

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

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

  498.                  bitalloc_12_bits[i], 1, 1,

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

  500.     }

  501.     dca_scalefactor.offset = -64;

  502.     dca_scalefactor.wrap = 2;

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

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

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

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

  507.                  scales_bits[i], 1, 1,

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

  509.     }

  510.     dca_tmode.offset = 0;

  511.     dca_tmode.wrap = 1;

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

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

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

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

  516.                  tmode_bits[i], 1, 1,

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

  518.     }

  519. 

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

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

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

  523.                 break;

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

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

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

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

  528. 

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

  530.                      bitalloc_sizes[i],

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

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

  533.             c++;

  534.         }

  535.     vlcs_initialized = 1;

  536. }

  537. 

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

  539. {

  540.     while (len--)

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

  542. }

  543. 

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

  545. {

  546.     int i, base, mask;

  547. 

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

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

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

  551.         base += av_popcount(mask);

  552. 

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

  554. }

  555. 

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

  557.                                          int xxch)

  558. {

  559.     int i, j;

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

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

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

  563.     int hdr_pos = 0, hdr_size = 0;

  564.     float sign, mag, scale_factor;

  565.     int this_chans, acc_mask;

  566.     int embedded_downmix;

  567.     int nchans, mask[8];

  568.     int coeff, ichan;

  569. 

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

  571.     if (xxch) {

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

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

  574.     }

  575. 

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

  577.     s->total_channels = nchans + base_channel;

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

  579. 

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

  581.     if (xxch) {

  582.         acc_mask = s->xxch_core_spkmask;

  583. 

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

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

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

  587. 

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

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

  590. 

  591.         /* check for downmixing information */

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

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

  594.             scale_factor     =

  595.                1.0f / dca_downmix_scale_factors[(get_bits(&s->gb, 6) - 1) << 2];

  596. 

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

  598. 

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

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

  601.             }

  602. 

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

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

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

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

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

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

  609.                             av_log(s->avctx, AV_LOG_WARNING,

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

  611.                             continue;

  612.                         }

  613. 

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

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

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

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

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

  619.                     }

  620.                 }

  621.             }

  622.         }

  623.     }

  624. 

  625.     if (s->prim_channels > DCA_PRIM_CHANNELS_MAX)

  626.         s->prim_channels = DCA_PRIM_CHANNELS_MAX;

  627. 

  628. 

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

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

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

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

  633.     }

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

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

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

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

  638.     }

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

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

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

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

  643. 

  644.     /* Get codebooks quantization indexes */

  645.     if (!base_channel)

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

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

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

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

  650. 

  651.     /* Get scale factor adjustment */

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

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

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

  655. 

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

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

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

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

  660. 

  661.     if (!xxch) {

  662.         if (s->crc_present) {

  663.             /* Audio header CRC check */

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

  665.         }

  666.     } else {

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

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

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

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

  671.     }

  672. 

  673.     s->current_subframe    = 0;

  674.     s->current_subsubframe = 0;

  675. 

  676. #ifdef TRACE

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

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

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

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

  681.                s->subband_activity[i]);

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

  683.                s->vq_start_subband[i]);

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

  685.                s->joint_intensity[i]);

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

  687.                s->transient_huffman[i]);

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

  689.                s->scalefactor_huffman[i]);

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

  691.                s->bitalloc_huffman[i]);

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

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

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

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

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

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

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

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

  700.     }

  701. #endif

  702. 

  703.     return 0;

  704. }

  705. 

  706. static int dca_parse_frame_header(DCAContext *s)

  707. {

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

  709. 

  710.     /* Sync code */

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

  712. 

  713.     /* Frame header */

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

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

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

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

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

  719.     if (s->frame_size < 95)

  720.         return AVERROR_INVALIDDATA;

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

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

  723.     if (!s->sample_rate)

  724.         return AVERROR_INVALIDDATA;

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

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

  727.     if (!s->bit_rate)

  728.         return AVERROR_INVALIDDATA;

  729. 

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

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

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

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

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

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

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

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

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

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

  740. 

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

  742.         s->lfe = 0;

  743.         av_log_ask_for_sample(s->avctx, "LFE is 3\n");

  744.         return AVERROR_PATCHWELCOME;

  745.     }

  746. 

  747.     /* TODO: check CRC */

  748.     if (s->crc_present)

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

  750. 

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

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

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

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

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

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

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

  758. 

  759.     /* FIXME: channels mixing levels */

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

  761.     if (s->lfe)

  762.         s->output |= DCA_LFE;

  763. 

  764. #ifdef TRACE

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

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

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

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

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

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

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

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

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

  774.            s->sample_rate);

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

  776.            s->bit_rate);

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

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

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

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

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

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

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

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

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

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

  787.            s->predictor_history);

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

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

  790.            s->multirate_inter);

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

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

  793.     av_log(s->avctx, AV_LOG_DEBUG,

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

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

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

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

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

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

  800. #endif

  801. 

  802.     /* Primary audio coding header */

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

  804. 

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

  806. }

  807. 

  808. 

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

  810. {

  811.     if (level < 5) {

  812.         /* huffman encoded */

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

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

  815.     } else if (level < 8) {

  816.         if (level + 1 > log2range) {

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

  818.             value = get_bits(gb, log2range);

  819.         } else {

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

  821.         }

  822.     }

  823.     return value;

  824. }

  825. 

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

  827. {

  828.     /* Primary audio coding side information */

  829.     int j, k;

  830. 

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

  832.         return AVERROR_INVALIDDATA;

  833. 

  834.     if (!base_channel) {

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

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

  837.     }

  838. 

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

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

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

  842.     }

  843. 

  844.     /* Get prediction codebook */

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

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

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

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

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

  850.             }

  851.         }

  852.     }

  853. 

  854.     /* Bit allocation index */

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

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

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

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

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

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

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

  862.                 av_log(s->avctx, AV_LOG_ERROR,

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

  864.                 return AVERROR_INVALIDDATA;

  865.             } else {

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

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

  868.             }

  869. 

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

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

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

  873.                 return AVERROR_INVALIDDATA;

  874.             }

  875.         }

  876.     }

  877. 

  878.     /* Transition mode */

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

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

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

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

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

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

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

  886.             }

  887.         }

  888.     }

  889. 

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

  891.         return AVERROR_INVALIDDATA;

  892. 

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

  894.         const uint32_t *scale_table;

  895.         int scale_sum, log_size;

  896. 

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

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

  899. 

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

  901.             scale_table = scale_factor_quant7;

  902.             log_size = 7;

  903.         } else {

  904.             scale_table = scale_factor_quant6;

  905.             log_size = 6;

  906.         }

  907. 

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

  909.         scale_sum = 0;

  910. 

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

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

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

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

  915.             }

  916. 

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

  918.                 /* Get second scale factor */

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

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

  921.             }

  922.         }

  923.     }

  924. 

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

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

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

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

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

  930.     }

  931. 

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

  933.         return AVERROR_INVALIDDATA;

  934. 

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

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

  937.         int source_channel;

  938. 

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

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

  941.             int scale = 0;

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

  943. 

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

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

  946. 

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

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

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

  950.             }

  951. 

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

  953.                 av_log(s->avctx, AV_LOG_DEBUG,

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

  955.                 s->debug_flag |= 0x02;

  956.             }

  957.         }

  958.     }

  959. 

  960.     /* Stereo downmix coefficients */

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

  962.         if (s->downmix) {

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

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

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

  966.             }

  967.         } else {

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

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

  970.                 av_log(s->avctx, AV_LOG_ERROR,

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

  972.                 return AVERROR_INVALIDDATA;

  973.             }

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

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

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

  977.             }

  978.         }

  979.     }

  980. 

  981.     /* Dynamic range coefficient */

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

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

  984. 

  985.     /* Side information CRC check word */

  986.     if (s->crc_present) {

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

  988.     }

  989. 

  990.     /*

  991.      * Primary audio data arrays

  992.      */

  993. 

  994.     /* VQ encoded high frequency subbands */

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

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

  997.             /* 1 vector -> 32 samples */

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

  999. 

  1000.     /* Low frequency effect data */

  1001.     if (!base_channel && s->lfe) {

  1002.         int quant7;

  1003.         /* LFE samples */

  1004.         int lfe_samples = 2 * s->lfe * (4 + block_index);

  1005.         int lfe_end_sample = 2 * s->lfe * (4 + block_index + s->subsubframes[s->current_subframe]);

  1006.         float lfe_scale;

  1007. 

  1008.         for (j = lfe_samples; j < lfe_end_sample; j++) {

  1009.             /* Signed 8 bits int */

  1010.             s->lfe_data[j] = get_sbits(&s->gb, 8);

  1011.         }

  1012. 

  1013.         /* Scale factor index */

  1014.         quant7 = get_bits(&s->gb, 8);

  1015.         if (quant7 > 127) {

  1016.             av_log_ask_for_sample(s->avctx, "LFEScaleIndex larger than 127\n");

  1017.             return AVERROR_INVALIDDATA;

  1018.         }

  1019.         s->lfe_scale_factor = scale_factor_quant7[quant7];

  1020. 

  1021.         /* Quantization step size * scale factor */

  1022.         lfe_scale = 0.035 * s->lfe_scale_factor;

  1023. 

  1024.         for (j = lfe_samples; j < lfe_end_sample; j++)

  1025.             s->lfe_data[j] *= lfe_scale;

  1026.     }

  1027. 

  1028. #ifdef TRACE

  1029.     av_log(s->avctx, AV_LOG_DEBUG, "subsubframes: %i\n",

  1030.            s->subsubframes[s->current_subframe]);

  1031.     av_log(s->avctx, AV_LOG_DEBUG, "partial samples: %i\n",

  1032.            s->partial_samples[s->current_subframe]);

  1033. 

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

  1035.         av_log(s->avctx, AV_LOG_DEBUG, "prediction mode:");

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

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

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

  1039.     }

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

  1041.         for (k = 0; k < s->subband_activity[j]; k++)

  1042.             av_log(s->avctx, AV_LOG_DEBUG,

  1043.                    "prediction coefs: %f, %f, %f, %f\n",

  1044.                    (float) adpcm_vb[s->prediction_vq[j][k]][0] / 8192,

  1045.                    (float) adpcm_vb[s->prediction_vq[j][k]][1] / 8192,

  1046.                    (float) adpcm_vb[s->prediction_vq[j][k]][2] / 8192,

  1047.                    (float) adpcm_vb[s->prediction_vq[j][k]][3] / 8192);

  1048.     }

  1049.     for (j = base_channel; j < s->prim_channels; j++) {

  1050.         av_log(s->avctx, AV_LOG_DEBUG, "bitalloc index: ");

  1051.         for (k = 0; k < s->vq_start_subband[j]; k++)

  1052.             av_log(s->avctx, AV_LOG_DEBUG, "%2.2i ", s->bitalloc[j][k]);

  1053.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1054.     }

  1055.     for (j = base_channel; j < s->prim_channels; j++) {

  1056.         av_log(s->avctx, AV_LOG_DEBUG, "Transition mode:");

  1057.         for (k = 0; k < s->subband_activity[j]; k++)

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

  1059.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1060.     }

  1061.     for (j = base_channel; j < s->prim_channels; j++) {

  1062.         av_log(s->avctx, AV_LOG_DEBUG, "Scale factor:");

  1063.         for (k = 0; k < s->subband_activity[j]; k++) {

  1064.             if (k >= s->vq_start_subband[j] || s->bitalloc[j][k] > 0)

  1065.                 av_log(s->avctx, AV_LOG_DEBUG, " %i", s->scale_factor[j][k][0]);

  1066.             if (k < s->vq_start_subband[j] && s->transition_mode[j][k])

  1067.                 av_log(s->avctx, AV_LOG_DEBUG, " %i(t)", s->scale_factor[j][k][1]);

  1068.         }

  1069.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1070.     }

  1071.     for (j = base_channel; j < s->prim_channels; j++) {

  1072.         if (s->joint_intensity[j] > 0) {

  1073.             int source_channel = s->joint_intensity[j] - 1;

  1074.             av_log(s->avctx, AV_LOG_DEBUG, "Joint scale factor index:\n");

  1075.             for (k = s->subband_activity[j]; k < s->subband_activity[source_channel]; k++)

  1076.                 av_log(s->avctx, AV_LOG_DEBUG, " %i", s->joint_scale_factor[j][k]);

  1077.             av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1078.         }

  1079.     }

  1080.     if (!base_channel && s->prim_channels > 2 && s->downmix) {

  1081.         av_log(s->avctx, AV_LOG_DEBUG, "Downmix coeffs:\n");

  1082.         for (j = 0; j < s->prim_channels; j++) {

  1083.             av_log(s->avctx, AV_LOG_DEBUG, "Channel 0, %d = %f\n", j,

  1084.                    dca_downmix_coeffs[s->downmix_coef[j][0]]);

  1085.             av_log(s->avctx, AV_LOG_DEBUG, "Channel 1, %d = %f\n", j,

  1086.                    dca_downmix_coeffs[s->downmix_coef[j][1]]);

  1087.         }

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

  1089.     }

  1090.     for (j = base_channel; j < s->prim_channels; j++)

  1091.         for (k = s->vq_start_subband[j]; k < s->subband_activity[j]; k++)

  1092.             av_log(s->avctx, AV_LOG_DEBUG, "VQ index: %i\n", s->high_freq_vq[j][k]);

  1093.     if (!base_channel && s->lfe) {

  1094.         int lfe_samples = 2 * s->lfe * (4 + block_index);

  1095.         int lfe_end_sample = 2 * s->lfe * (4 + block_index + s->subsubframes[s->current_subframe]);

  1096. 

  1097.         av_log(s->avctx, AV_LOG_DEBUG, "LFE samples:\n");

  1098.         for (j = lfe_samples; j < lfe_end_sample; j++)

  1099.             av_log(s->avctx, AV_LOG_DEBUG, " %f", s->lfe_data[j]);

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

  1101.     }

  1102. #endif

  1103. 

  1104.     return 0;

  1105. }

  1106. 

  1107. static void qmf_32_subbands(DCAContext *s, int chans,

  1108.                             float samples_in[32][8], float *samples_out,

  1109.                             float scale)

  1110. {

  1111.     const float *prCoeff;

  1112.     int i;

  1113. 

  1114.     int sb_act = s->subband_activity[chans];

  1115.     int subindex;

  1116. 

  1117.     scale *= sqrt(1 / 8.0);

  1118. 

  1119.     /* Select filter */

  1120.     if (!s->multirate_inter)    /* Non-perfect reconstruction */

  1121.         prCoeff = fir_32bands_nonperfect;

  1122.     else                        /* Perfect reconstruction */

  1123.         prCoeff = fir_32bands_perfect;

  1124. 

  1125.     for (i = sb_act; i < 32; i++)

  1126.         s->raXin[i] = 0.0;

  1127. 

  1128.     /* Reconstructed channel sample index */

  1129.     for (subindex = 0; subindex < 8; subindex++) {

  1130.         /* Load in one sample from each subband and clear inactive subbands */

  1131.         for (i = 0; i < sb_act; i++) {

  1132.             unsigned sign = (i - 1) & 2;

  1133.             uint32_t v    = AV_RN32A(&samples_in[i][subindex]) ^ sign << 30;

  1134.             AV_WN32A(&s->raXin[i], v);

  1135.         }

  1136. 

  1137.         s->synth.synth_filter_float(&s->imdct,

  1138.                                     s->subband_fir_hist[chans],

  1139.                                     &s->hist_index[chans],

  1140.                                     s->subband_fir_noidea[chans], prCoeff,

  1141.                                     samples_out, s->raXin, scale);

  1142.         samples_out += 32;

  1143.     }

  1144. }

  1145. 

  1146. static void lfe_interpolation_fir(DCAContext *s, int decimation_select,

  1147.                                   int num_deci_sample, float *samples_in,

  1148.                                   float *samples_out, float scale)

  1149. {

  1150.     /* samples_in: An array holding decimated samples.

  1151.      *   Samples in current subframe starts from samples_in[0],

  1152.      *   while samples_in[-1], samples_in[-2], ..., stores samples

  1153.      *   from last subframe as history.

  1154.      *

  1155.      * samples_out: An array holding interpolated samples

  1156.      */

  1157. 

  1158.     int decifactor;

  1159.     const float *prCoeff;

  1160.     int deciindex;

  1161. 

  1162.     /* Select decimation filter */

  1163.     if (decimation_select == 1) {

  1164.         decifactor = 64;

  1165.         prCoeff = lfe_fir_128;

  1166.     } else {

  1167.         decifactor = 32;

  1168.         prCoeff = lfe_fir_64;

  1169.     }

  1170.     /* Interpolation */

  1171.     for (deciindex = 0; deciindex < num_deci_sample; deciindex++) {

  1172.         s->dcadsp.lfe_fir(samples_out, samples_in, prCoeff, decifactor, scale);

  1173.         samples_in++;

  1174.         samples_out += 2 * decifactor;

  1175.     }

  1176. }

  1177. 

  1178. /* downmixing routines */

  1179. #define MIX_REAR1(samples, s1, rs, coef)            \

  1180.     samples[0][i] += samples[s1][i] * coef[rs][0];  \

  1181.     samples[1][i] += samples[s1][i] * coef[rs][1];

  1182. 

  1183. #define MIX_REAR2(samples, s1, s2, rs, coef)                                          \

  1184.     samples[0][i] += samples[s1][i] * coef[rs][0] + samples[s2][i] * coef[rs + 1][0]; \

  1185.     samples[1][i] += samples[s1][i] * coef[rs][1] + samples[s2][i] * coef[rs + 1][1];

  1186. 

  1187. #define MIX_FRONT3(samples, coef)                                      \

  1188.     t = samples[c][i];                                                 \

  1189.     u = samples[l][i];                                                 \

  1190.     v = samples[r][i];                                                 \

  1191.     samples[0][i] = t * coef[0][0] + u * coef[1][0] + v * coef[2][0];  \

  1192.     samples[1][i] = t * coef[0][1] + u * coef[1][1] + v * coef[2][1];

  1193. 

  1194. #define DOWNMIX_TO_STEREO(op1, op2)             \

  1195.     for (i = 0; i < 256; i++) {                 \

  1196.         op1                                     \

  1197.         op2                                     \

  1198.     }

  1199. 

  1200. static void dca_downmix(float **samples, int srcfmt,

  1201.                         int downmix_coef[DCA_PRIM_CHANNELS_MAX][2],

  1202.                         const int8_t *channel_mapping)

  1203. {

  1204.     int c, l, r, sl, sr, s;

  1205.     int i;

  1206.     float t, u, v;

  1207.     float coef[DCA_PRIM_CHANNELS_MAX][2];

  1208. 

  1209.     for (i = 0; i < DCA_PRIM_CHANNELS_MAX; i++) {

  1210.         coef[i][0] = dca_downmix_coeffs[downmix_coef[i][0]];

  1211.         coef[i][1] = dca_downmix_coeffs[downmix_coef[i][1]];

  1212.     }

  1213. 

  1214.     switch (srcfmt) {

  1215.     case DCA_MONO:

  1216.     case DCA_CHANNEL:

  1217.     case DCA_STEREO_TOTAL:

  1218.     case DCA_STEREO_SUMDIFF:

  1219.     case DCA_4F2R:

  1220.         av_log(NULL, AV_LOG_ERROR, "Not implemented!\n");

  1221.         break;

  1222.     case DCA_STEREO:

  1223.         break;

  1224.     case DCA_3F:

  1225.         c = channel_mapping[0];

  1226.         l = channel_mapping[1];

  1227.         r = channel_mapping[2];

  1228.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef), );

  1229.         break;

  1230.     case DCA_2F1R:

  1231.         s = channel_mapping[2];

  1232.         DOWNMIX_TO_STEREO(MIX_REAR1(samples, s, 2, coef), );

  1233.         break;

  1234.     case DCA_3F1R:

  1235.         c = channel_mapping[0];

  1236.         l = channel_mapping[1];

  1237.         r = channel_mapping[2];

  1238.         s = channel_mapping[3];

  1239.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),

  1240.                           MIX_REAR1(samples, s, 3, coef));

  1241.         break;

  1242.     case DCA_2F2R:

  1243.         sl = channel_mapping[2];

  1244.         sr = channel_mapping[3];

  1245.         DOWNMIX_TO_STEREO(MIX_REAR2(samples, sl, sr, 2, coef), );

  1246.         break;

  1247.     case DCA_3F2R:

  1248.         c  = channel_mapping[0];

  1249.         l  = channel_mapping[1];

  1250.         r  = channel_mapping[2];

  1251.         sl = channel_mapping[3];

  1252.         sr = channel_mapping[4];

  1253.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),

  1254.                           MIX_REAR2(samples, sl, sr, 3, coef));

  1255.         break;

  1256.     }

  1257. }

  1258. 

  1259. 

  1260. #ifndef decode_blockcodes

  1261. /* Very compact version of the block code decoder that does not use table

  1262.  * look-up but is slightly slower */

  1263. static int decode_blockcode(int code, int levels, int *values)

  1264. {

  1265.     int i;

  1266.     int offset = (levels - 1) >> 1;

  1267. 

  1268.     for (i = 0; i < 4; i++) {

  1269.         int div = FASTDIV(code, levels);

  1270.         values[i] = code - offset - div * levels;

  1271.         code = div;

  1272.     }

  1273. 

  1274.     return code;

  1275. }

  1276. 

  1277. static int decode_blockcodes(int code1, int code2, int levels, int *values)

  1278. {

  1279.     return decode_blockcode(code1, levels, values) |

  1280.            decode_blockcode(code2, levels, values + 4);

  1281. }

  1282. #endif

  1283. 

  1284. static const uint8_t abits_sizes[7]  = { 7, 10, 12, 13, 15, 17, 19 };

  1285. static const uint8_t abits_levels[7] = { 3,  5,  7,  9, 13, 17, 25 };

  1286. 

  1287. #ifndef int8x8_fmul_int32

  1288. static inline void int8x8_fmul_int32(float *dst, const int8_t *src, int scale)

  1289. {

  1290.     float fscale = scale / 16.0;

  1291.     int i;

  1292.     for (i = 0; i < 8; i++)

  1293.         dst[i] = src[i] * fscale;

  1294. }

  1295. #endif

  1296. 

  1297. static int dca_subsubframe(DCAContext *s, int base_channel, int block_index)

  1298. {

  1299.     int k, l;

  1300.     int subsubframe = s->current_subsubframe;

  1301. 

  1302.     const float *quant_step_table;

  1303. 

  1304.     /* FIXME */

  1305.     float (*subband_samples)[DCA_SUBBANDS][8] = s->subband_samples[block_index];

  1306.     LOCAL_ALIGNED_16(int, block, [8]);

  1307. 

  1308.     /*

  1309.      * Audio data

  1310.      */

  1311. 

  1312.     /* Select quantization step size table */

  1313.     if (s->bit_rate_index == 0x1f)

  1314.         quant_step_table = lossless_quant_d;

  1315.     else

  1316.         quant_step_table = lossy_quant_d;

  1317. 

  1318.     for (k = base_channel; k < s->prim_channels; k++) {

  1319.         if (get_bits_left(&s->gb) < 0)

  1320.             return AVERROR_INVALIDDATA;

  1321. 

  1322.         for (l = 0; l < s->vq_start_subband[k]; l++) {

  1323.             int m;

  1324. 

  1325.             /* Select the mid-tread linear quantizer */

  1326.             int abits = s->bitalloc[k][l];

  1327. 

  1328.             float quant_step_size = quant_step_table[abits];

  1329. 

  1330.             /*

  1331.              * Determine quantization index code book and its type

  1332.              */

  1333. 

  1334.             /* Select quantization index code book */

  1335.             int sel = s->quant_index_huffman[k][abits];

  1336. 

  1337.             /*

  1338.              * Extract bits from the bit stream

  1339.              */

  1340.             if (!abits) {

  1341.                 memset(subband_samples[k][l], 0, 8 * sizeof(subband_samples[0][0][0]));

  1342.             } else {

  1343.                 /* Deal with transients */

  1344.                 int sfi = s->transition_mode[k][l] && subsubframe >= s->transition_mode[k][l];

  1345.                 float rscale = quant_step_size * s->scale_factor[k][l][sfi] *

  1346.                                s->scalefactor_adj[k][sel];

  1347. 

  1348.                 if (abits >= 11 || !dca_smpl_bitalloc[abits].vlc[sel].table) {

  1349.                     if (abits <= 7) {

  1350.                         /* Block code */

  1351.                         int block_code1, block_code2, size, levels, err;

  1352. 

  1353.                         size   = abits_sizes[abits - 1];

  1354.                         levels = abits_levels[abits - 1];

  1355. 

  1356.                         block_code1 = get_bits(&s->gb, size);

  1357.                         block_code2 = get_bits(&s->gb, size);

  1358.                         err = decode_blockcodes(block_code1, block_code2,

  1359.                                                 levels, block);

  1360.                         if (err) {

  1361.                             av_log(s->avctx, AV_LOG_ERROR,

  1362.                                    "ERROR: block code look-up failed\n");

  1363.                             return AVERROR_INVALIDDATA;

  1364.                         }

  1365.                     } else {

  1366.                         /* no coding */

  1367.                         for (m = 0; m < 8; m++)

  1368.                             block[m] = get_sbits(&s->gb, abits - 3);

  1369.                     }

  1370.                 } else {

  1371.                     /* Huffman coded */

  1372.                     for (m = 0; m < 8; m++)

  1373.                         block[m] = get_bitalloc(&s->gb,

  1374.                                                 &dca_smpl_bitalloc[abits], sel);

  1375.                 }

  1376. 

  1377.                 s->fmt_conv.int32_to_float_fmul_scalar(subband_samples[k][l],

  1378.                                                        block, rscale, 8);

  1379.             }

  1380. 

  1381.             /*

  1382.              * Inverse ADPCM if in prediction mode

  1383.              */

  1384.             if (s->prediction_mode[k][l]) {

  1385.                 int n;

  1386.                 for (m = 0; m < 8; m++) {

  1387.                     for (n = 1; n <= 4; n++)

  1388.                         if (m >= n)

  1389.                             subband_samples[k][l][m] +=

  1390.                                 (adpcm_vb[s->prediction_vq[k][l]][n - 1] *

  1391.                                  subband_samples[k][l][m - n] / 8192);

  1392.                         else if (s->predictor_history)

  1393.                             subband_samples[k][l][m] +=

  1394.                                 (adpcm_vb[s->prediction_vq[k][l]][n - 1] *

  1395.                                  s->subband_samples_hist[k][l][m - n + 4] / 8192);

  1396.                 }

  1397.             }

  1398.         }

  1399. 

  1400.         /*

  1401.          * Decode VQ encoded high frequencies

  1402.          */

  1403.         for (l = s->vq_start_subband[k]; l < s->subband_activity[k]; l++) {

  1404.             /* 1 vector -> 32 samples but we only need the 8 samples

  1405.              * for this subsubframe. */

  1406.             int hfvq = s->high_freq_vq[k][l];

  1407. 

  1408.             if (!s->debug_flag & 0x01) {

  1409.                 av_log(s->avctx, AV_LOG_DEBUG,

  1410.                        "Stream with high frequencies VQ coding\n");

  1411.                 s->debug_flag |= 0x01;

  1412.             }

  1413. 

  1414.             int8x8_fmul_int32(subband_samples[k][l],

  1415.                               &high_freq_vq[hfvq][subsubframe * 8],

  1416.                               s->scale_factor[k][l][0]);

  1417.         }

  1418.     }

  1419. 

  1420.     /* Check for DSYNC after subsubframe */

  1421.     if (s->aspf || subsubframe == s->subsubframes[s->current_subframe] - 1) {

  1422.         if (0xFFFF == get_bits(&s->gb, 16)) {   /* 0xFFFF */

  1423. #ifdef TRACE

  1424.             av_log(s->avctx, AV_LOG_DEBUG, "Got subframe DSYNC\n");

  1425. #endif

  1426.         } else {

  1427.             av_log(s->avctx, AV_LOG_ERROR, "Didn't get subframe DSYNC\n");

  1428.         }

  1429.     }

  1430. 

  1431.     /* Backup predictor history for adpcm */

  1432.     for (k = base_channel; k < s->prim_channels; k++)

  1433.         for (l = 0; l < s->vq_start_subband[k]; l++)

  1434.             memcpy(s->subband_samples_hist[k][l],

  1435.                    &subband_samples[k][l][4],

  1436.                    4 * sizeof(subband_samples[0][0][0]));

  1437. 

  1438.     return 0;

  1439. }

  1440. 

  1441. static int dca_filter_channels(DCAContext *s, int block_index)

  1442. {

  1443.     float (*subband_samples)[DCA_SUBBANDS][8] = s->subband_samples[block_index];

  1444.     int k;

  1445. 

  1446.     /* 32 subbands QMF */

  1447.     for (k = 0; k < s->prim_channels; k++) {

  1448. /*        static float pcm_to_double[8] = { 32768.0, 32768.0, 524288.0, 524288.0,

  1449.                                             0, 8388608.0, 8388608.0 };*/

  1450.         if (s->channel_order_tab[k] >= 0)

  1451.             qmf_32_subbands(s, k, subband_samples[k],

  1452.                             s->samples_chanptr[s->channel_order_tab[k]],

  1453.                             M_SQRT1_2 / 32768.0 /* pcm_to_double[s->source_pcm_res] */);

  1454.     }

  1455. 

  1456.     /* Down mixing */

  1457.     if (s->avctx->request_channels == 2 && s->prim_channels > 2) {

  1458.         dca_downmix(s->samples_chanptr, s->amode, s->downmix_coef, s->channel_order_tab);

  1459.     }

  1460. 

  1461.     /* Generate LFE samples for this subsubframe FIXME!!! */

  1462.     if (s->output & DCA_LFE) {

  1463.         lfe_interpolation_fir(s, s->lfe, 2 * s->lfe,

  1464.                               s->lfe_data + 2 * s->lfe * (block_index + 4),

  1465.                               s->samples_chanptr[s->lfe_index],

  1466.                               1.0 / (256.0 * 32768.0));

  1467.         /* Outputs 20bits pcm samples */

  1468.     }

  1469. 

  1470.     return 0;

  1471. }

  1472. 

  1473. 

  1474. static int dca_subframe_footer(DCAContext *s, int base_channel)

  1475. {

  1476.     int aux_data_count = 0, i;

  1477. 

  1478.     /*

  1479.      * Unpack optional information

  1480.      */

  1481. 

  1482.     /* presumably optional information only appears in the core? */

  1483.     if (!base_channel) {

  1484.         if (s->timestamp)

  1485.             skip_bits_long(&s->gb, 32);

  1486. 

  1487.         if (s->aux_data)

  1488.             aux_data_count = get_bits(&s->gb, 6);

  1489. 

  1490.         for (i = 0; i < aux_data_count; i++)

  1491.             get_bits(&s->gb, 8);

  1492. 

  1493.         if (s->crc_present && (s->downmix || s->dynrange))

  1494.             get_bits(&s->gb, 16);

  1495.     }

  1496. 

  1497.     return 0;

  1498. }

  1499. 

  1500. /**

  1501.  * Decode a dca frame block

  1502.  *

  1503.  * @param s     pointer to the DCAContext

  1504.  */

  1505. 

  1506. static int dca_decode_block(DCAContext *s, int base_channel, int block_index)

  1507. {

  1508.     int ret;

  1509. 

  1510.     /* Sanity check */

  1511.     if (s->current_subframe >= s->subframes) {

  1512.         av_log(s->avctx, AV_LOG_DEBUG, "check failed: %i>%i",

  1513.                s->current_subframe, s->subframes);

  1514.         return AVERROR_INVALIDDATA;

  1515.     }

  1516. 

  1517.     if (!s->current_subsubframe) {

  1518. #ifdef TRACE

  1519.         av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subframe_header\n");

  1520. #endif

  1521.         /* Read subframe header */

  1522.         if ((ret = dca_subframe_header(s, base_channel, block_index)))

  1523.             return ret;

  1524.     }

  1525. 

  1526.     /* Read subsubframe */

  1527. #ifdef TRACE

  1528.     av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subsubframe\n");

  1529. #endif

  1530.     if ((ret = dca_subsubframe(s, base_channel, block_index)))

  1531.         return ret;

  1532. 

  1533.     /* Update state */

  1534.     s->current_subsubframe++;

  1535.     if (s->current_subsubframe >= s->subsubframes[s->current_subframe]) {

  1536.         s->current_subsubframe = 0;

  1537.         s->current_subframe++;

  1538.     }

  1539.     if (s->current_subframe >= s->subframes) {

  1540. #ifdef TRACE

  1541.         av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subframe_footer\n");

  1542. #endif

  1543.         /* Read subframe footer */

  1544.         if ((ret = dca_subframe_footer(s, base_channel)))

  1545.             return ret;

  1546.     }

  1547. 

  1548.     return 0;

  1549. }

  1550. 

  1551. /**

  1552.  * Return the number of channels in an ExSS speaker mask (HD)

  1553.  */

  1554. static int dca_exss_mask2count(int mask)

  1555. {

  1556.     /* count bits that mean speaker pairs twice */

  1557.     return av_popcount(mask) +

  1558.            av_popcount(mask & (DCA_EXSS_CENTER_LEFT_RIGHT      |

  1559.                                DCA_EXSS_FRONT_LEFT_RIGHT       |

  1560.                                DCA_EXSS_FRONT_HIGH_LEFT_RIGHT  |

  1561.                                DCA_EXSS_WIDE_LEFT_RIGHT        |

  1562.                                DCA_EXSS_SIDE_LEFT_RIGHT        |

  1563.                                DCA_EXSS_SIDE_HIGH_LEFT_RIGHT   |

  1564.                                DCA_EXSS_SIDE_REAR_LEFT_RIGHT   |

  1565.                                DCA_EXSS_REAR_LEFT_RIGHT        |

  1566.                                DCA_EXSS_REAR_HIGH_LEFT_RIGHT));

  1567. }

  1568. 

  1569. /**

  1570.  * Skip mixing coefficients of a single mix out configuration (HD)

  1571.  */

  1572. static void dca_exss_skip_mix_coeffs(GetBitContext *gb, int channels, int out_ch)

  1573. {

  1574.     int i;

  1575. 

  1576.     for (i = 0; i < channels; i++) {

  1577.         int mix_map_mask = get_bits(gb, out_ch);

  1578.         int num_coeffs = av_popcount(mix_map_mask);

  1579.         skip_bits_long(gb, num_coeffs * 6);

  1580.     }

  1581. }

  1582. 

  1583. /**

  1584.  * Parse extension substream asset header (HD)

  1585.  */

  1586. static int dca_exss_parse_asset_header(DCAContext *s)

  1587. {

  1588.     int header_pos = get_bits_count(&s->gb);

  1589.     int header_size;

  1590.     int channels = 0;

  1591.     int embedded_stereo = 0;

  1592.     int embedded_6ch    = 0;

  1593.     int drc_code_present;

  1594.     int av_uninit(extensions_mask);

  1595.     int i, j;

  1596. 

  1597.     if (get_bits_left(&s->gb) < 16)

  1598.         return -1;

  1599. 

  1600.     /* We will parse just enough to get to the extensions bitmask with which

  1601.      * we can set the profile value. */

  1602. 

  1603.     header_size = get_bits(&s->gb, 9) + 1;

  1604.     skip_bits(&s->gb, 3); // asset index

  1605. 

  1606.     if (s->static_fields) {

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

  1608.             skip_bits(&s->gb, 4); // asset type descriptor

  1609.         if (get_bits1(&s->gb))

  1610.             skip_bits_long(&s->gb, 24); // language descriptor

  1611. 

  1612.         if (get_bits1(&s->gb)) {

  1613.             /* How can one fit 1024 bytes of text here if the maximum value

  1614.              * for the asset header size field above was 512 bytes? */

  1615.             int text_length = get_bits(&s->gb, 10) + 1;

  1616.             if (get_bits_left(&s->gb) < text_length * 8)

  1617.                 return -1;

  1618.             skip_bits_long(&s->gb, text_length * 8); // info text

  1619.         }

  1620. 

  1621.         skip_bits(&s->gb, 5); // bit resolution - 1

  1622.         skip_bits(&s->gb, 4); // max sample rate code

  1623.         channels = get_bits(&s->gb, 8) + 1;

  1624. 

  1625.         if (get_bits1(&s->gb)) { // 1-to-1 channels to speakers

  1626.             int spkr_remap_sets;

  1627.             int spkr_mask_size = 16;

  1628.             int num_spkrs[7];

  1629. 

  1630.             if (channels > 2)

  1631.                 embedded_stereo = get_bits1(&s->gb);

  1632.             if (channels > 6)

  1633.                 embedded_6ch = get_bits1(&s->gb);

  1634. 

  1635.             if (get_bits1(&s->gb)) {

  1636.                 spkr_mask_size = (get_bits(&s->gb, 2) + 1) << 2;

  1637.                 skip_bits(&s->gb, spkr_mask_size); // spkr activity mask

  1638.             }

  1639. 

  1640.             spkr_remap_sets = get_bits(&s->gb, 3);

  1641. 

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

  1643.                 /* std layout mask for each remap set */

  1644.                 num_spkrs[i] = dca_exss_mask2count(get_bits(&s->gb, spkr_mask_size));

  1645.             }

  1646. 

  1647.             for (i = 0; i < spkr_remap_sets; i++) {

  1648.                 int num_dec_ch_remaps = get_bits(&s->gb, 5) + 1;

  1649.                 if (get_bits_left(&s->gb) < 0)

  1650.                     return -1;

  1651. 

  1652.                 for (j = 0; j < num_spkrs[i]; j++) {

  1653.                     int remap_dec_ch_mask = get_bits_long(&s->gb, num_dec_ch_remaps);

  1654.                     int num_dec_ch = av_popcount(remap_dec_ch_mask);

  1655.                     skip_bits_long(&s->gb, num_dec_ch * 5); // remap codes

  1656.                 }

  1657.             }

  1658. 

  1659.         } else {

  1660.             skip_bits(&s->gb, 3); // representation type

  1661.         }

  1662.     }

  1663. 

  1664.     drc_code_present = get_bits1(&s->gb);

  1665.     if (drc_code_present)

  1666.         get_bits(&s->gb, 8); // drc code

  1667. 

  1668.     if (get_bits1(&s->gb))

  1669.         skip_bits(&s->gb, 5); // dialog normalization code

  1670. 

  1671.     if (drc_code_present && embedded_stereo)

  1672.         get_bits(&s->gb, 8); // drc stereo code

  1673. 

  1674.     if (s->mix_metadata && get_bits1(&s->gb)) {

  1675.         skip_bits(&s->gb, 1); // external mix

  1676.         skip_bits(&s->gb, 6); // post mix gain code

  1677. 

  1678.         if (get_bits(&s->gb, 2) != 3) // mixer drc code

  1679.             skip_bits(&s->gb, 3); // drc limit

  1680.         else

  1681.             skip_bits(&s->gb, 8); // custom drc code

  1682. 

  1683.         if (get_bits1(&s->gb)) // channel specific scaling

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

  1685.                 skip_bits_long(&s->gb, s->mix_config_num_ch[i] * 6); // scale codes

  1686.         else

  1687.             skip_bits_long(&s->gb, s->num_mix_configs * 6); // scale codes

  1688. 

  1689.         for (i = 0; i < s->num_mix_configs; i++) {

  1690.             if (get_bits_left(&s->gb) < 0)

  1691.                 return -1;

  1692.             dca_exss_skip_mix_coeffs(&s->gb, channels, s->mix_config_num_ch[i]);

  1693.             if (embedded_6ch)

  1694.                 dca_exss_skip_mix_coeffs(&s->gb, 6, s->mix_config_num_ch[i]);

  1695.             if (embedded_stereo)

  1696.                 dca_exss_skip_mix_coeffs(&s->gb, 2, s->mix_config_num_ch[i]);

  1697.         }

  1698.     }

  1699. 

  1700.     switch (get_bits(&s->gb, 2)) {

  1701.     case 0: extensions_mask = get_bits(&s->gb, 12); break;

  1702.     case 1: extensions_mask = DCA_EXT_EXSS_XLL;     break;

  1703.     case 2: extensions_mask = DCA_EXT_EXSS_LBR;     break;

  1704.     case 3: extensions_mask = 0; /* aux coding */   break;

  1705.     }

  1706. 

  1707.     /* not parsed further, we were only interested in the extensions mask */

  1708. 

  1709.     if (get_bits_left(&s->gb) < 0)

  1710.         return -1;

  1711. 

  1712.     if (get_bits_count(&s->gb) - header_pos > header_size * 8) {

  1713.         av_log(s->avctx, AV_LOG_WARNING, "Asset header size mismatch.\n");

  1714.         return -1;

  1715.     }

  1716.     skip_bits_long(&s->gb, header_pos + header_size * 8 - get_bits_count(&s->gb));

  1717. 

  1718.     if (extensions_mask & DCA_EXT_EXSS_XLL)

  1719.         s->profile = FF_PROFILE_DTS_HD_MA;

  1720.     else if (extensions_mask & (DCA_EXT_EXSS_XBR | DCA_EXT_EXSS_X96 |

  1721.                                 DCA_EXT_EXSS_XXCH))

  1722.         s->profile = FF_PROFILE_DTS_HD_HRA;

  1723. 

  1724.     if (!(extensions_mask & DCA_EXT_CORE))

  1725.         av_log(s->avctx, AV_LOG_WARNING, "DTS core detection mismatch.\n");

  1726.     if ((extensions_mask & DCA_CORE_EXTS) != s->core_ext_mask)

  1727.         av_log(s->avctx, AV_LOG_WARNING,

  1728.                "DTS extensions detection mismatch (%d, %d)\n",

  1729.                extensions_mask & DCA_CORE_EXTS, s->core_ext_mask);

  1730. 

  1731.     return 0;

  1732. }

  1733. 

  1734. static int dca_xbr_parse_frame(DCAContext *s)

  1735. {

  1736.     int scale_table_high[DCA_CHSET_CHANS_MAX][DCA_SUBBANDS][2];

  1737.     int active_bands[DCA_CHSETS_MAX][DCA_CHSET_CHANS_MAX];

  1738.     int abits_high[DCA_CHSET_CHANS_MAX][DCA_SUBBANDS];

  1739.     int anctemp[DCA_CHSET_CHANS_MAX];

  1740.     int chset_fsize[DCA_CHSETS_MAX];

  1741.     int n_xbr_ch[DCA_CHSETS_MAX];

  1742.     int hdr_size, num_chsets, xbr_tmode, hdr_pos;

  1743.     int i, j, k, l, chset, chan_base;

  1744. 

  1745.     av_log(s->avctx, AV_LOG_DEBUG, "DTS-XBR: decoding XBR extension\n");

  1746. 

  1747.     /* get bit position of sync header */

  1748.     hdr_pos = get_bits_count(&s->gb) - 32;

  1749. 

  1750.     hdr_size = get_bits(&s->gb, 6) + 1;

  1751.     num_chsets = get_bits(&s->gb, 2) + 1;

  1752. 

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

  1754.         chset_fsize[i] = get_bits(&s->gb, 14) + 1;

  1755. 

  1756.     xbr_tmode = get_bits1(&s->gb);

  1757. 

  1758.     for(i = 0; i < num_chsets; i++) {

  1759.         n_xbr_ch[i] = get_bits(&s->gb, 3) + 1;

  1760.         k = get_bits(&s->gb, 2) + 5;

  1761.         for(j = 0; j < n_xbr_ch[i]; j++)

  1762.             active_bands[i][j] = get_bits(&s->gb, k) + 1;

  1763.     }

  1764. 

  1765.     /* skip to the end of the header */

  1766.     i = get_bits_count(&s->gb);

  1767.     if(hdr_pos + hdr_size * 8 > i)

  1768.         skip_bits_long(&s->gb, hdr_pos + hdr_size * 8 - i);

  1769. 

  1770.     /* loop over the channel data sets */

  1771.     /* only decode as many channels as we've decoded base data for */

  1772.     for(chset = 0, chan_base = 0;

  1773.         chset < num_chsets && chan_base + n_xbr_ch[chset] <= s->prim_channels;

  1774.         chan_base += n_xbr_ch[chset++]) {

  1775.         int start_posn = get_bits_count(&s->gb);

  1776.         int subsubframe = 0;

  1777.         int subframe = 0;

  1778. 

  1779.         /* loop over subframes */

  1780.         for (k = 0; k < (s->sample_blocks / 8); k++) {

  1781.             /* parse header if we're on first subsubframe of a block */

  1782.             if(subsubframe == 0) {

  1783.                 /* Parse subframe header */

  1784.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1785.                     anctemp[i] = get_bits(&s->gb, 2) + 2;

  1786.                 }

  1787. 

  1788.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1789.                     get_array(&s->gb, abits_high[i], active_bands[chset][i], anctemp[i]);

  1790.                 }

  1791. 

  1792.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1793.                     anctemp[i] = get_bits(&s->gb, 3);

  1794.                     if(anctemp[i] < 1) {

  1795.                         av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: SYNC ERROR\n");

  1796.                         return AVERROR_INVALIDDATA;

  1797.                     }

  1798.                 }

  1799. 

  1800.                 /* generate scale factors */

  1801.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1802.                     const uint32_t *scale_table;

  1803.                     int nbits;

  1804. 

  1805.                     if (s->scalefactor_huffman[chan_base+i] == 6) {

  1806.                         scale_table = scale_factor_quant7;

  1807.                     } else {

  1808.                         scale_table = scale_factor_quant6;

  1809.                     }

  1810. 

  1811.                     nbits = anctemp[i];

  1812. 

  1813.                     for(j = 0; j < active_bands[chset][i]; j++) {

  1814.                         if(abits_high[i][j] > 0) {

  1815.                             scale_table_high[i][j][0] =

  1816.                                 scale_table[get_bits(&s->gb, nbits)];

  1817. 

  1818.                             if(xbr_tmode && s->transition_mode[i][j]) {

  1819.                                 scale_table_high[i][j][1] =

  1820.                                     scale_table[get_bits(&s->gb, nbits)];

  1821.                             }

  1822.                         }

  1823.                     }

  1824.                 }

  1825.             }

  1826. 

  1827.             /* decode audio array for this block */

  1828.             for(i = 0; i < n_xbr_ch[chset]; i++) {

  1829.                 for(j = 0; j < active_bands[chset][i]; j++) {

  1830.                     const int xbr_abits = abits_high[i][j];

  1831.                     const float quant_step_size = lossless_quant_d[xbr_abits];

  1832.                     const int sfi = xbr_tmode && s->transition_mode[i][j] && subsubframe >= s->transition_mode[i][j];

  1833.                     const float rscale = quant_step_size * scale_table_high[i][j][sfi];

  1834.                     float *subband_samples = s->subband_samples[k][chan_base+i][j];

  1835.                     int block[8];

  1836. 

  1837.                     if(xbr_abits <= 0)

  1838.                         continue;

  1839. 

  1840.                     if(xbr_abits > 7) {

  1841.                         get_array(&s->gb, block, 8, xbr_abits - 3);

  1842.                     } else {

  1843.                         int block_code1, block_code2, size, levels, err;

  1844. 

  1845.                         size   = abits_sizes[xbr_abits - 1];

  1846.                         levels = abits_levels[xbr_abits - 1];

  1847. 

  1848.                         block_code1 = get_bits(&s->gb, size);

  1849.                         block_code2 = get_bits(&s->gb, size);

  1850.                         err = decode_blockcodes(block_code1, block_code2,

  1851.                                                 levels, block);

  1852.                         if (err) {

  1853.                             av_log(s->avctx, AV_LOG_ERROR,

  1854.                                    "ERROR: DTS-XBR: block code look-up failed\n");

  1855.                             return AVERROR_INVALIDDATA;

  1856.                         }

  1857.                     }

  1858. 

  1859.                     /* scale & sum into subband */

  1860.                     for(l = 0; l < 8; l++)

  1861.                         subband_samples[l] += (float)block[l] * rscale;

  1862.                 }

  1863.             }

  1864. 

  1865.             /* check DSYNC marker */

  1866.             if(s->aspf || subsubframe == s->subsubframes[subframe] - 1) {

  1867.                 if(get_bits(&s->gb, 16) != 0xffff) {

  1868.                     av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: Didn't get subframe DSYNC\n");

  1869.                     return AVERROR_INVALIDDATA;

  1870.                 }

  1871.             }

  1872. 

  1873.             /* advance sub-sub-frame index */

  1874.             if(++subsubframe >= s->subsubframes[subframe]) {

  1875.                 subsubframe = 0;

  1876.                 subframe++;

  1877.             }

  1878.         }

  1879. 

  1880.         /* skip to next channel set */

  1881.         i = get_bits_count(&s->gb);

  1882.         if(start_posn + chset_fsize[chset] * 8 != i) {

  1883.             j = start_posn + chset_fsize[chset] * 8 - i;

  1884.             if(j < 0 || j >= 8)

  1885.                 av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: end of channel set,"

  1886.                        " skipping further than expected (%d bits)\n", j);

  1887.             skip_bits_long(&s->gb, j);

  1888.         }

  1889.     }

  1890. 

  1891.     return 0;

  1892. }

  1893. 

  1894. /* parse initial header for XXCH and dump details */

  1895. static int dca_xxch_decode_frame(DCAContext *s)

  1896. {

  1897.     int hdr_size, spkmsk_bits, num_chsets, core_spk, hdr_pos;

  1898.     int i, chset, base_channel, chstart, fsize[8];

  1899. 

  1900.     /* assume header word has already been parsed */

  1901.     hdr_pos     = get_bits_count(&s->gb) - 32;

  1902.     hdr_size    = get_bits(&s->gb, 6) + 1;

  1903.   /*chhdr_crc   =*/ skip_bits1(&s->gb);

  1904.     spkmsk_bits = get_bits(&s->gb, 5) + 1;

  1905.     num_chsets  = get_bits(&s->gb, 2) + 1;

  1906. 

  1907.     for (i = 0; i < num_chsets; i++)

  1908.         fsize[i] = get_bits(&s->gb, 14) + 1;

  1909. 

  1910.     core_spk               = get_bits(&s->gb, spkmsk_bits);

  1911.     s->xxch_core_spkmask   = core_spk;

  1912.     s->xxch_nbits_spk_mask = spkmsk_bits;

  1913.     s->xxch_dmix_embedded  = 0;

  1914. 

  1915.     /* skip to the end of the header */

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

  1917.     if (hdr_pos + hdr_size * 8 > i)

  1918.         skip_bits_long(&s->gb, hdr_pos + hdr_size * 8 - i);

  1919. 

  1920.     for (chset = 0; chset < num_chsets; chset++) {

  1921.         chstart       = get_bits_count(&s->gb);

  1922.         base_channel  = s->prim_channels;

  1923.         s->xxch_chset = chset;

  1924. 

  1925.         /* XXCH and Core headers differ, see 6.4.2 "XXCH Channel Set Header" vs.

  1926.            5.3.2 "Primary Audio Coding Header", DTS Spec 1.3.1 */

  1927.         dca_parse_audio_coding_header(s, base_channel, 1);

  1928. 

  1929.         /* decode channel data */

  1930.         for (i = 0; i < (s->sample_blocks / 8); i++) {

  1931.             if (dca_decode_block(s, base_channel, i)) {

  1932.                 av_log(s->avctx, AV_LOG_ERROR,

  1933.                        "Error decoding DTS-XXCH extension\n");

  1934.                 continue;

  1935.             }

  1936.         }

  1937. 

  1938.         /* skip to end of this section */

  1939.         i = get_bits_count(&s->gb);

  1940.         if (chstart + fsize[chset] * 8 > i)

  1941.             skip_bits_long(&s->gb, chstart + fsize[chset] * 8 - i);

  1942.     }

  1943.     s->xxch_chset = num_chsets;

  1944. 

  1945.     return 0;

  1946. }

  1947. 

  1948. /**

  1949.  * Parse extension substream header (HD)

  1950.  */

  1951. static void dca_exss_parse_header(DCAContext *s)

  1952. {

  1953.     int asset_size[8];

  1954.     int ss_index;

  1955.     int blownup;

  1956.     int num_audiop = 1;

  1957.     int num_assets = 1;

  1958.     int active_ss_mask[8];

  1959.     int i, j;

  1960.     int start_posn;

  1961.     int hdrsize;

  1962.     uint32_t mkr;

  1963. 

  1964.     if (get_bits_left(&s->gb) < 52)

  1965.         return;

  1966. 

  1967.     start_posn = get_bits_count(&s->gb) - 32;

  1968. 

  1969.     skip_bits(&s->gb, 8); // user data

  1970.     ss_index = get_bits(&s->gb, 2);

  1971. 

  1972.     blownup = get_bits1(&s->gb);

  1973.     hdrsize = get_bits(&s->gb,  8 + 4 * blownup) + 1; // header_size

  1974.     skip_bits(&s->gb, 16 + 4 * blownup); // hd_size

  1975. 

  1976.     s->static_fields = get_bits1(&s->gb);

  1977.     if (s->static_fields) {

  1978.         skip_bits(&s->gb, 2); // reference clock code

  1979.         skip_bits(&s->gb, 3); // frame duration code

  1980. 

  1981.         if (get_bits1(&s->gb))

  1982.             skip_bits_long(&s->gb, 36); // timestamp

  1983. 

  1984.         /* a single stream can contain multiple audio assets that can be

  1985.          * combined to form multiple audio presentations */

  1986. 

  1987.         num_audiop = get_bits(&s->gb, 3) + 1;

  1988.         if (num_audiop > 1) {

  1989.             av_log_ask_for_sample(s->avctx, "Multiple DTS-HD audio presentations.");

  1990.             /* ignore such streams for now */

  1991.             return;

  1992.         }

  1993. 

  1994.         num_assets = get_bits(&s->gb, 3) + 1;

  1995.         if (num_assets > 1) {

  1996.             av_log_ask_for_sample(s->avctx, "Multiple DTS-HD audio assets.");

  1997.             /* ignore such streams for now */

  1998.             return;

  1999.         }

  2000. 

  2001.         for (i = 0; i < num_audiop; i++)

  2002.             active_ss_mask[i] = get_bits(&s->gb, ss_index + 1);

  2003. 

  2004.         for (i = 0; i < num_audiop; i++)

  2005.             for (j = 0; j <= ss_index; j++)

  2006.                 if (active_ss_mask[i] & (1 << j))

  2007.                     skip_bits(&s->gb, 8); // active asset mask

  2008. 

  2009.         s->mix_metadata = get_bits1(&s->gb);

  2010.         if (s->mix_metadata) {

  2011.             int mix_out_mask_size;

  2012. 

  2013.             skip_bits(&s->gb, 2); // adjustment level

  2014.             mix_out_mask_size  = (get_bits(&s->gb, 2) + 1) << 2;

  2015.             s->num_mix_configs =  get_bits(&s->gb, 2) + 1;

  2016. 

  2017.             for (i = 0; i < s->num_mix_configs; i++) {

  2018.                 int mix_out_mask        = get_bits(&s->gb, mix_out_mask_size);

  2019.                 s->mix_config_num_ch[i] = dca_exss_mask2count(mix_out_mask);

  2020.             }

  2021.         }

  2022.     }

  2023. 

  2024.     for (i = 0; i < num_assets; i++)

  2025.         asset_size[i] = get_bits_long(&s->gb, 16 + 4 * blownup);

  2026. 

  2027.     for (i = 0; i < num_assets; i++) {

  2028.         if (dca_exss_parse_asset_header(s))

  2029.             return;

  2030.     }

  2031. 

  2032.     /* not parsed further, we were only interested in the extensions mask

  2033.      * from the asset header */

  2034. 

  2035.     if (num_assets > 0) {

  2036.         j = get_bits_count(&s->gb);

  2037.         if (start_posn + hdrsize * 8 > j)

  2038.             skip_bits_long(&s->gb, start_posn + hdrsize * 8 - j);

  2039. 

  2040.         for (i = 0; i < num_assets; i++) {

  2041.             start_posn = get_bits_count(&s->gb);

  2042.             mkr        = get_bits_long(&s->gb, 32);

  2043. 

  2044.             /* parse extensions that we know about */

  2045.             if (mkr == 0x655e315e) {

  2046.                 dca_xbr_parse_frame(s);

  2047.             } else if (mkr == 0x47004a03) {

  2048.                 dca_xxch_decode_frame(s);

  2049.                 s->core_ext_mask |= DCA_EXT_XXCH; /* xxx use for chan reordering */

  2050.             } else {

  2051.                 av_log(s->avctx, AV_LOG_DEBUG,

  2052.                        "DTS-ExSS: unknown marker = 0x%08x\n", mkr);

  2053.             }

  2054. 

  2055.             /* skip to end of block */

  2056.             j = get_bits_count(&s->gb);

  2057.             if (start_posn + asset_size[i] * 8 > j)

  2058.                 skip_bits_long(&s->gb, start_posn + asset_size[i] * 8 - j);

  2059.         }

  2060.     }

  2061. }

  2062. 

  2063. /**

  2064.  * Main frame decoding function

  2065.  * FIXME add arguments

  2066.  */

  2067. static int dca_decode_frame(AVCodecContext *avctx, void *data,

  2068.                             int *got_frame_ptr, AVPacket *avpkt)

  2069. {

  2070.     const uint8_t *buf = avpkt->data;

  2071.     int buf_size = avpkt->size;

  2072.     int channel_mask;

  2073.     int channel_layout;

  2074.     int lfe_samples;

  2075.     int num_core_channels = 0;

  2076.     int i, ret;

  2077.     float **samples_flt;

  2078.     float *src_chan;

  2079.     float *dst_chan;

  2080.     DCAContext *s = avctx->priv_data;

  2081.     int core_ss_end;

  2082.     int channels, full_channels;

  2083.     float scale;

  2084.     int achan;

  2085.     int chset;

  2086.     int mask;

  2087.     int lavc;

  2088.     int posn;

  2089.     int j, k;

  2090.     int endch;

  2091. 

  2092.     s->xch_present = 0;

  2093. 

  2094.     s->dca_buffer_size = ff_dca_convert_bitstream(buf, buf_size, s->dca_buffer,

  2095.                                                   DCA_MAX_FRAME_SIZE + DCA_MAX_EXSS_HEADER_SIZE);

  2096.     if (s->dca_buffer_size == AVERROR_INVALIDDATA) {

  2097.         av_log(avctx, AV_LOG_ERROR, "Not a valid DCA frame\n");

  2098.         return AVERROR_INVALIDDATA;

  2099.     }

  2100. 

  2101.     init_get_bits(&s->gb, s->dca_buffer, s->dca_buffer_size * 8);

  2102.     if ((ret = dca_parse_frame_header(s)) < 0) {

  2103.         //seems like the frame is corrupt, try with the next one

  2104.         return ret;

  2105.     }

  2106.     //set AVCodec values with parsed data

  2107.     avctx->sample_rate = s->sample_rate;

  2108.     avctx->bit_rate    = s->bit_rate;

  2109. 

  2110.     s->profile = FF_PROFILE_DTS;

  2111. 

  2112.     for (i = 0; i < (s->sample_blocks / 8); i++) {

  2113.         if ((ret = dca_decode_block(s, 0, i))) {

  2114.             av_log(avctx, AV_LOG_ERROR, "error decoding block\n");

  2115.             return ret;

  2116.         }

  2117.     }

  2118. 

  2119.     /* record number of core channels incase less than max channels are requested */

  2120.     num_core_channels = s->prim_channels;

  2121. 

  2122.     if (s->ext_coding)

  2123.         s->core_ext_mask = dca_ext_audio_descr_mask[s->ext_descr];

  2124.     else

  2125.         s->core_ext_mask = 0;

  2126. 

  2127.     core_ss_end = FFMIN(s->frame_size, s->dca_buffer_size) * 8;

  2128. 

  2129.     /* only scan for extensions if ext_descr was unknown or indicated a

  2130.      * supported XCh extension */

  2131.     if (s->core_ext_mask < 0 || s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH)) {

  2132. 

  2133.         /* if ext_descr was unknown, clear s->core_ext_mask so that the

  2134.          * extensions scan can fill it up */

  2135.         s->core_ext_mask = FFMAX(s->core_ext_mask, 0);

  2136. 

  2137.         /* extensions start at 32-bit boundaries into bitstream */

  2138.         skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);

  2139. 

  2140.         while (core_ss_end - get_bits_count(&s->gb) >= 32) {

  2141.             uint32_t bits = get_bits_long(&s->gb, 32);

  2142. 

  2143.             switch (bits) {

  2144.             case 0x5a5a5a5a: {

  2145.                 int ext_amode, xch_fsize;

  2146. 

  2147.                 s->xch_base_channel = s->prim_channels;

  2148. 

  2149.                 /* validate sync word using XCHFSIZE field */

  2150.                 xch_fsize = show_bits(&s->gb, 10);

  2151.                 if ((s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize) &&

  2152.                     (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize + 1))

  2153.                     continue;

  2154. 

  2155.                 /* skip length-to-end-of-frame field for the moment */

  2156.                 skip_bits(&s->gb, 10);

  2157. 

  2158.                 s->core_ext_mask |= DCA_EXT_XCH;

  2159. 

  2160.                 /* extension amode(number of channels in extension) should be 1 */

  2161.                 /* AFAIK XCh is not used for more channels */

  2162.                 if ((ext_amode = get_bits(&s->gb, 4)) != 1) {

  2163.                     av_log(avctx, AV_LOG_ERROR, "XCh extension amode %d not"

  2164.                            " supported!\n", ext_amode);

  2165.                     continue;

  2166.                 }

  2167. 

  2168.                 if (s->xch_base_channel < 2) {

  2169.                     av_log_ask_for_sample(avctx, "XCh with fewer than 2 base channels is not supported\n");

  2170.                     continue;

  2171.                 }

  2172. 

  2173.                 /* much like core primary audio coding header */

  2174.                 dca_parse_audio_coding_header(s, s->xch_base_channel, 0);

  2175. 

  2176.                 for (i = 0; i < (s->sample_blocks / 8); i++)

  2177.                     if ((ret = dca_decode_block(s, s->xch_base_channel, i))) {

  2178.                         av_log(avctx, AV_LOG_ERROR, "error decoding XCh extension\n");

  2179.                         continue;

  2180.                     }

  2181. 

  2182.                 s->xch_present = 1;

  2183.                 break;

  2184.             }

  2185.             case 0x47004a03:

  2186.                 /* XXCh: extended channels */

  2187.                 /* usually found either in core or HD part in DTS-HD HRA streams,

  2188.                  * but not in DTS-ES which contains XCh extensions instead */

  2189.                 s->core_ext_mask |= DCA_EXT_XXCH;

  2190.                 dca_xxch_decode_frame(s);

  2191.                 break;

  2192. 

  2193.             case 0x1d95f262: {

  2194.                 int fsize96 = show_bits(&s->gb, 12) + 1;

  2195.                 if (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + fsize96)

  2196.                     continue;

  2197. 

  2198.                 av_log(avctx, AV_LOG_DEBUG, "X96 extension found at %d bits\n",

  2199.                        get_bits_count(&s->gb));

  2200.                 skip_bits(&s->gb, 12);

  2201.                 av_log(avctx, AV_LOG_DEBUG, "FSIZE96 = %d bytes\n", fsize96);

  2202.                 av_log(avctx, AV_LOG_DEBUG, "REVNO = %d\n", get_bits(&s->gb, 4));

  2203. 

  2204.                 s->core_ext_mask |= DCA_EXT_X96;

  2205.                 break;

  2206.             }

  2207.             }

  2208. 

  2209.             skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);

  2210.         }

  2211.     } else {

  2212.         /* no supported extensions, skip the rest of the core substream */

  2213.         skip_bits_long(&s->gb, core_ss_end - get_bits_count(&s->gb));

  2214.     }

  2215. 

  2216.     if (s->core_ext_mask & DCA_EXT_X96)

  2217.         s->profile = FF_PROFILE_DTS_96_24;

  2218.     else if (s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH))

  2219.         s->profile = FF_PROFILE_DTS_ES;

  2220. 

  2221.     /* check for ExSS (HD part) */

  2222.     if (s->dca_buffer_size - s->frame_size > 32 &&

  2223.         get_bits_long(&s->gb, 32) == DCA_HD_MARKER)

  2224.         dca_exss_parse_header(s);

  2225. 

  2226.     avctx->profile = s->profile;

  2227. 

  2228.     full_channels = channels = s->prim_channels + !!s->lfe;

  2229. 

  2230.     /* If we have XXCH then the channel layout is managed differently */

  2231.     /* note that XLL will also have another way to do things */

  2232.     if (!(s->core_ext_mask & DCA_EXT_XXCH)

  2233.         || (s->core_ext_mask & DCA_EXT_XXCH && avctx->request_channels > 0

  2234.             && avctx->request_channels

  2235.             < num_core_channels + !!s->lfe + s->xxch_chset_nch[0]))

  2236.     { /* xxx should also do MA extensions */

  2237.         if (s->amode < 16) {

  2238.             avctx->channel_layout = dca_core_channel_layout[s->amode];

  2239. 

  2240.             if (s->xch_present && (!avctx->request_channels ||

  2241.                                    avctx->request_channels

  2242.                                    > num_core_channels + !!s->lfe)) {

  2243.                 avctx->channel_layout |= AV_CH_BACK_CENTER;

  2244.                 if (s->lfe) {

  2245.                     avctx->channel_layout |= AV_CH_LOW_FREQUENCY;

  2246.                     s->channel_order_tab = dca_channel_reorder_lfe_xch[s->amode];

  2247.                 } else {

  2248.                     s->channel_order_tab = dca_channel_reorder_nolfe_xch[s->amode];

  2249.                 }

  2250.                 if (s->channel_order_tab[s->xch_base_channel] < 0)

  2251.                     return AVERROR_INVALIDDATA;

  2252.             } else {

  2253.                 channels = num_core_channels + !!s->lfe;

  2254.                 s->xch_present = 0; /* disable further xch processing */

  2255.                 if (s->lfe) {

  2256.                     avctx->channel_layout |= AV_CH_LOW_FREQUENCY;

  2257.                     s->channel_order_tab = dca_channel_reorder_lfe[s->amode];

  2258.                 } else

  2259.                     s->channel_order_tab = dca_channel_reorder_nolfe[s->amode];

  2260.             }

  2261. 

  2262.             if (channels > !!s->lfe &&

  2263.                 s->channel_order_tab[channels - 1 - !!s->lfe] < 0)

  2264.                 return AVERROR_INVALIDDATA;

  2265. 

  2266.             if (av_get_channel_layout_nb_channels(avctx->channel_layout) != channels) {

  2267.                 av_log(avctx, AV_LOG_ERROR, "Number of channels %d mismatches layout %d\n", channels, av_get_channel_layout_nb_channels(avctx->channel_layout));

  2268.                 return AVERROR_INVALIDDATA;

  2269.             }

  2270. 

  2271.             if (avctx->request_channels == 2 && s->prim_channels > 2) {

  2272.                 channels = 2;

  2273.                 s->output = DCA_STEREO;

  2274.                 avctx->channel_layout = AV_CH_LAYOUT_STEREO;

  2275.             }

  2276.             else if (avctx->request_channel_layout & AV_CH_LAYOUT_NATIVE) {

  2277.                 static const int8_t dca_channel_order_native[9] = { 0, 1, 2, 3, 4, 5, 6, 7, 8 };

  2278.                 s->channel_order_tab = dca_channel_order_native;

  2279.             }

  2280.             s->lfe_index = dca_lfe_index[s->amode];

  2281.         } else {

  2282.             av_log(avctx, AV_LOG_ERROR,

  2283.                    "Non standard configuration %d !\n", s->amode);

  2284.             return AVERROR_INVALIDDATA;

  2285.         }

  2286. 

  2287.         s->xxch_dmix_embedded = 0;

  2288.     } else {

  2289.         /* we only get here if an XXCH channel set can be added to the mix */

  2290.         channel_mask = s->xxch_core_spkmask;

  2291. 

  2292.         if (avctx->request_channels > 0

  2293.             && avctx->request_channels < s->prim_channels) {

  2294.             channels = num_core_channels + !!s->lfe;

  2295.             for (i = 0; i < s->xxch_chset && channels + s->xxch_chset_nch[i]

  2296.                                               <= avctx->request_channels; i++) {

  2297.                 channels += s->xxch_chset_nch[i];

  2298.                 channel_mask |= s->xxch_spk_masks[i];

  2299.             }

  2300.         } else {

  2301.             channels = s->prim_channels + !!s->lfe;

  2302.             for (i = 0; i < s->xxch_chset; i++) {

  2303.                 channel_mask |= s->xxch_spk_masks[i];

  2304.             }

  2305.         }

  2306. 

  2307.         /* Given the DTS spec'ed channel mask, generate an avcodec version */

  2308.         channel_layout = 0;

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

  2310.             if (channel_mask & (1 << i)) {

  2311.                 channel_layout |= map_xxch_to_native[i];

  2312.             }

  2313.         }

  2314. 

  2315.         /* make sure that we have managed to get equivelant dts/avcodec channel

  2316.          * masks in some sense -- unfortunately some channels could overlap */

  2317.         if (av_popcount(channel_mask) != av_popcount(channel_layout)) {

  2318.             av_log(avctx, AV_LOG_DEBUG,

  2319.                    "DTS-XXCH: Inconsistant avcodec/dts channel layouts\n");

  2320.             return AVERROR_INVALIDDATA;

  2321.         }

  2322. 

  2323.         avctx->channel_layout = channel_layout;

  2324. 

  2325.         if (!(avctx->request_channel_layout & AV_CH_LAYOUT_NATIVE)) {

  2326.             /* Estimate DTS --> avcodec ordering table */

  2327.             for (chset = -1, j = 0; chset < s->xxch_chset; ++chset) {

  2328.                 mask = chset >= 0 ? s->xxch_spk_masks[chset]

  2329.                                   : s->xxch_core_spkmask;

  2330.                 for (i = 0; i < s->xxch_nbits_spk_mask; i++) {

  2331.                     if (mask & ~(DCA_XXCH_LFE1 | DCA_XXCH_LFE2) & (1 << i)) {

  2332.                         lavc = map_xxch_to_native[i];

  2333.                         posn = av_popcount(channel_layout & (lavc - 1));

  2334.                         s->xxch_order_tab[j++] = posn;

  2335.                     }

  2336.                 }

  2337.             }

  2338. 

  2339.             s->lfe_index = av_popcount(channel_layout & (AV_CH_LOW_FREQUENCY-1));

  2340.         } else { /* native ordering */

  2341.             for (i = 0; i < channels; i++)

  2342.                 s->xxch_order_tab[i] = i;

  2343. 

  2344.             s->lfe_index = channels - 1;

  2345.         }

  2346. 

  2347.         s->channel_order_tab = s->xxch_order_tab;

  2348.     }

  2349. 

  2350.     if (avctx->channels != channels) {

  2351.         if (avctx->channels)

  2352.             av_log(avctx, AV_LOG_INFO, "Number of channels changed in DCA decoder (%d -> %d)\n", avctx->channels, channels);

  2353.         avctx->channels = channels;

  2354.     }

  2355. 

  2356.     /* get output buffer */

  2357.     s->frame.nb_samples = 256 * (s->sample_blocks / 8);

  2358.     if ((ret = ff_get_buffer(avctx, &s->frame)) < 0) {

  2359.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  2360.         return ret;

  2361.     }

  2362.     samples_flt = (float  **) s->frame.extended_data;

  2363. 

  2364.     /* allocate buffer for extra channels if downmixing */

  2365.     if (avctx->channels < full_channels) {

  2366.         ret = av_samples_get_buffer_size(NULL, full_channels - channels,

  2367.                                          s->frame.nb_samples,

  2368.                                          avctx->sample_fmt, 0);

  2369.         if (ret < 0)

  2370.             return ret;

  2371. 

  2372.         av_fast_malloc(&s->extra_channels_buffer,

  2373.                        &s->extra_channels_buffer_size, ret);

  2374.         if (!s->extra_channels_buffer)

  2375.             return AVERROR(ENOMEM);

  2376. 

  2377.         ret = av_samples_fill_arrays((uint8_t **)s->extra_channels, NULL,

  2378.                                      s->extra_channels_buffer,

  2379.                                      full_channels - channels,

  2380.                                      s->frame.nb_samples, avctx->sample_fmt, 0);

  2381.         if (ret < 0)

  2382.             return ret;

  2383.     }

  2384. 

  2385.     /* filter to get final output */

  2386.     for (i = 0; i < (s->sample_blocks / 8); i++) {

  2387.         int ch;

  2388. 

  2389.         for (ch = 0; ch < channels; ch++)

  2390.             s->samples_chanptr[ch] = samples_flt[ch] + i * 256;

  2391.         for (; ch < full_channels; ch++)

  2392.             s->samples_chanptr[ch] = s->extra_channels[ch - channels] + i * 256;

  2393. 

  2394.         dca_filter_channels(s, i);

  2395. 

  2396.         /* If this was marked as a DTS-ES stream we need to subtract back- */

  2397.         /* channel from SL & SR to remove matrixed back-channel signal */

  2398.         if ((s->source_pcm_res & 1) && s->xch_present) {

  2399.             float *back_chan = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel]];

  2400.             float *lt_chan   = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel - 2]];

  2401.             float *rt_chan   = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel - 1]];

  2402.             s->fdsp.vector_fmac_scalar(lt_chan, back_chan, -M_SQRT1_2, 256);

  2403.             s->fdsp.vector_fmac_scalar(rt_chan, back_chan, -M_SQRT1_2, 256);

  2404.         }

  2405. 

  2406.         /* If stream contains XXCH, we might need to undo an embedded downmix */

  2407.         if (s->xxch_dmix_embedded) {

  2408.             /* Loop over channel sets in turn */

  2409.             ch = num_core_channels;

  2410.             for (chset = 0; chset < s->xxch_chset; chset++) {

  2411.                 endch = ch + s->xxch_chset_nch[chset];

  2412.                 mask = s->xxch_dmix_embedded;

  2413. 

  2414.                 /* undo downmix */

  2415.                 for (j = ch; j < endch; j++) {

  2416.                     if (mask & (1 << j)) { /* this channel has been mixed-out */

  2417.                         src_chan = s->samples_chanptr[s->channel_order_tab[j]];

  2418.                         for (k = 0; k < endch; k++) {

  2419.                             achan = s->channel_order_tab[k];

  2420.                             scale = s->xxch_dmix_coeff[j][k];

  2421.                             if (scale != 0.0) {

  2422.                                 dst_chan = s->samples_chanptr[achan];

  2423.                                 s->fdsp.vector_fmac_scalar(dst_chan, src_chan,

  2424.                                                            -scale, 256);

  2425.                             }

  2426.                         }

  2427.                     }

  2428.                 }

  2429. 

  2430.                 /* if a downmix has been embedded then undo the pre-scaling */

  2431.                 if ((mask & (1 << ch)) && s->xxch_dmix_sf[chset] != 1.0f) {

  2432.                     scale = s->xxch_dmix_sf[chset];

  2433. 

  2434.                     for (j = 0; j < ch; j++) {

  2435.                         src_chan = s->samples_chanptr[s->channel_order_tab[j]];

  2436.                         for (k = 0; k < 256; k++)

  2437.                             src_chan[k] *= scale;

  2438.                     }

  2439. 

  2440.                     /* LFE channel is always part of core, scale if it exists */

  2441.                     if (s->lfe) {

  2442.                         src_chan = s->samples_chanptr[s->lfe_index];

  2443.                         for (k = 0; k < 256; k++)

  2444.                             src_chan[k] *= scale;

  2445.                     }

  2446.                 }

  2447. 

  2448.                 ch = endch;

  2449.             }

  2450. 

  2451.         }

  2452.     }

  2453. 

  2454.     /* update lfe history */

  2455.     lfe_samples = 2 * s->lfe * (s->sample_blocks / 8);

  2456.     for (i = 0; i < 2 * s->lfe * 4; i++)

  2457.         s->lfe_data[i] = s->lfe_data[i + lfe_samples];

  2458. 

  2459.     *got_frame_ptr    = 1;

  2460.     *(AVFrame *) data = s->frame;

  2461. 

  2462.     return buf_size;

  2463. }

  2464. 

  2465. 

  2466. 

  2467. /**

  2468.  * DCA initialization

  2469.  *

  2470.  * @param avctx     pointer to the AVCodecContext

  2471.  */

  2472. 

  2473. static av_cold int dca_decode_init(AVCodecContext *avctx)

  2474. {

  2475.     DCAContext *s = avctx->priv_data;

  2476. 

  2477.     s->avctx = avctx;

  2478.     dca_init_vlcs();

  2479. 

  2480.     avpriv_float_dsp_init(&s->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);

  2481.     ff_mdct_init(&s->imdct, 6, 1, 1.0);

  2482.     ff_synth_filter_init(&s->synth);

  2483.     ff_dcadsp_init(&s->dcadsp);

  2484.     ff_fmt_convert_init(&s->fmt_conv, avctx);

  2485. 

  2486.     avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;

  2487. 

  2488.     /* allow downmixing to stereo */

  2489.     if (avctx->channels > 0 && avctx->request_channels < avctx->channels &&

  2490.         avctx->request_channels == 2) {

  2491.         avctx->channels = avctx->request_channels;

  2492.     }

  2493. 

  2494.     avcodec_get_frame_defaults(&s->frame);

  2495.     avctx->coded_frame = &s->frame;

  2496. 

  2497.     return 0;

  2498. }

  2499. 

  2500. static av_cold int dca_decode_end(AVCodecContext *avctx)

  2501. {

  2502.     DCAContext *s = avctx->priv_data;

  2503.     ff_mdct_end(&s->imdct);

  2504.     av_freep(&s->extra_channels_buffer);

  2505.     return 0;

  2506. }

  2507. 

  2508. static const AVProfile profiles[] = {

  2509.     { FF_PROFILE_DTS,        "DTS"        },

  2510.     { FF_PROFILE_DTS_ES,     "DTS-ES"     },

  2511.     { FF_PROFILE_DTS_96_24,  "DTS 96/24"  },

  2512.     { FF_PROFILE_DTS_HD_HRA, "DTS-HD HRA" },

  2513.     { FF_PROFILE_DTS_HD_MA,  "DTS-HD MA"  },

  2514.     { FF_PROFILE_UNKNOWN },

  2515. };

  2516. 

  2517. AVCodec ff_dca_decoder = {

  2518.     .name            = "dca",

  2519.     .type            = AVMEDIA_TYPE_AUDIO,

  2520.     .id              = AV_CODEC_ID_DTS,

  2521.     .priv_data_size  = sizeof(DCAContext),

  2522.     .init            = dca_decode_init,

  2523.     .decode          = dca_decode_frame,

  2524.     .close           = dca_decode_end,

  2525.     .long_name       = NULL_IF_CONFIG_SMALL("DCA (DTS Coherent Acoustics)"),

  2526.     .capabilities    = CODEC_CAP_CHANNEL_CONF | CODEC_CAP_DR1,

  2527.     .sample_fmts     = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,

  2528.                                                        AV_SAMPLE_FMT_NONE },

  2529.     .profiles        = NULL_IF_CONFIG_SMALL(profiles),

  2530. };