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FFmpeg/libavcodec/dcadec.c

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  1. /*

  2.  * DCA compatible decoder

  3.  * Copyright (C) 2004 Gildas Bazin

  4.  * Copyright (C) 2004 Benjamin Zores

  5.  * Copyright (C) 2006 Benjamin Larsson

  6.  * Copyright (C) 2007 Konstantin Shishkov

  7.  *

  8.  * This file is part of FFmpeg.

  9.  *

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

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

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

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

  14.  *

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

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

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

  18.  * Lesser General Public License for more details.

  19.  *

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

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

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

  23.  */

  24. 

  25. #include <math.h>

  26. #include <stddef.h>

  27. #include <stdio.h>

  28. 

  29. #include "libavutil/channel_layout.h"

  30. #include "libavutil/common.h"

  31. #include "libavutil/float_dsp.h"

  32. #include "libavutil/internal.h"

  33. #include "libavutil/intreadwrite.h"

  34. #include "libavutil/mathematics.h"

  35. #include "libavutil/opt.h"

  36. #include "libavutil/samplefmt.h"

  37. #include "avcodec.h"

  38. #include "fft.h"

  39. #include "get_bits.h"

  40. #include "dcadata.h"

  41. #include "dcahuff.h"

  42. #include "dca.h"

  43. #include "mathops.h"

  44. #include "synth_filter.h"

  45. #include "dcadsp.h"

  46. #include "fmtconvert.h"

  47. #include "internal.h"

  48. 

  49. #if ARCH_ARM

  50. #   include "arm/dca.h"

  51. #endif

  52. #if ARCH_X86

  53. #   include "x86/dca.h"

  54. #endif

  55. 

  56. //#define TRACE

  57. 

  58. #define DCA_PRIM_CHANNELS_MAX  (7)

  59. #define DCA_SUBBANDS          (64)

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

  61. #define DCA_SUBSUBFRAMES_MAX   (4)

  62. #define DCA_SUBFRAMES_MAX     (16)

  63. #define DCA_BLOCKS_MAX        (16)

  64. #define DCA_LFE_MAX            (3)

  65. #define DCA_CHSETS_MAX         (4)

  66. #define DCA_CHSET_CHANS_MAX    (8)

  67. 

  68. enum DCAMode {

  69.     DCA_MONO = 0,

  70.     DCA_CHANNEL,

  71.     DCA_STEREO,

  72.     DCA_STEREO_SUMDIFF,

  73.     DCA_STEREO_TOTAL,

  74.     DCA_3F,

  75.     DCA_2F1R,

  76.     DCA_3F1R,

  77.     DCA_2F2R,

  78.     DCA_3F2R,

  79.     DCA_4F2R

  80. };

  81. 

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

  83. enum DCAExSSSpeakerMask {

  84.     DCA_EXSS_FRONT_CENTER          = 0x0001,

  85.     DCA_EXSS_FRONT_LEFT_RIGHT      = 0x0002,

  86.     DCA_EXSS_SIDE_REAR_LEFT_RIGHT  = 0x0004,

  87.     DCA_EXSS_LFE                   = 0x0008,

  88.     DCA_EXSS_REAR_CENTER           = 0x0010,

  89.     DCA_EXSS_FRONT_HIGH_LEFT_RIGHT = 0x0020,

  90.     DCA_EXSS_REAR_LEFT_RIGHT       = 0x0040,

  91.     DCA_EXSS_FRONT_HIGH_CENTER     = 0x0080,

  92.     DCA_EXSS_OVERHEAD              = 0x0100,

  93.     DCA_EXSS_CENTER_LEFT_RIGHT     = 0x0200,

  94.     DCA_EXSS_WIDE_LEFT_RIGHT       = 0x0400,

  95.     DCA_EXSS_SIDE_LEFT_RIGHT       = 0x0800,

  96.     DCA_EXSS_LFE2                  = 0x1000,

  97.     DCA_EXSS_SIDE_HIGH_LEFT_RIGHT  = 0x2000,

  98.     DCA_EXSS_REAR_HIGH_CENTER      = 0x4000,

  99.     DCA_EXSS_REAR_HIGH_LEFT_RIGHT  = 0x8000,

  100. };

  101. 

  102. enum DCAXxchSpeakerMask {

  103.     DCA_XXCH_FRONT_CENTER          = 0x0000001,

  104.     DCA_XXCH_FRONT_LEFT            = 0x0000002,

  105.     DCA_XXCH_FRONT_RIGHT           = 0x0000004,

  106.     DCA_XXCH_SIDE_REAR_LEFT        = 0x0000008,

  107.     DCA_XXCH_SIDE_REAR_RIGHT       = 0x0000010,

  108.     DCA_XXCH_LFE1                  = 0x0000020,

  109.     DCA_XXCH_REAR_CENTER           = 0x0000040,

  110.     DCA_XXCH_SURROUND_REAR_LEFT    = 0x0000080,

  111.     DCA_XXCH_SURROUND_REAR_RIGHT   = 0x0000100,

  112.     DCA_XXCH_SIDE_SURROUND_LEFT    = 0x0000200,

  113.     DCA_XXCH_SIDE_SURROUND_RIGHT   = 0x0000400,

  114.     DCA_XXCH_FRONT_CENTER_LEFT     = 0x0000800,

  115.     DCA_XXCH_FRONT_CENTER_RIGHT    = 0x0001000,

  116.     DCA_XXCH_FRONT_HIGH_LEFT       = 0x0002000,

  117.     DCA_XXCH_FRONT_HIGH_CENTER     = 0x0004000,

  118.     DCA_XXCH_FRONT_HIGH_RIGHT      = 0x0008000,

  119.     DCA_XXCH_LFE2                  = 0x0010000,

  120.     DCA_XXCH_SIDE_FRONT_LEFT       = 0x0020000,

  121.     DCA_XXCH_SIDE_FRONT_RIGHT      = 0x0040000,

  122.     DCA_XXCH_OVERHEAD              = 0x0080000,

  123.     DCA_XXCH_SIDE_HIGH_LEFT        = 0x0100000,

  124.     DCA_XXCH_SIDE_HIGH_RIGHT       = 0x0200000,

  125.     DCA_XXCH_REAR_HIGH_CENTER      = 0x0400000,

  126.     DCA_XXCH_REAR_HIGH_LEFT        = 0x0800000,

  127.     DCA_XXCH_REAR_HIGH_RIGHT       = 0x1000000,

  128.     DCA_XXCH_REAR_LOW_CENTER       = 0x2000000,

  129.     DCA_XXCH_REAR_LOW_LEFT         = 0x4000000,

  130.     DCA_XXCH_REAR_LOW_RIGHT        = 0x8000000,

  131. };

  132. 

  133. static const uint32_t map_xxch_to_native[28] = {

  134.     AV_CH_FRONT_CENTER,

  135.     AV_CH_FRONT_LEFT,

  136.     AV_CH_FRONT_RIGHT,

  137.     AV_CH_SIDE_LEFT,

  138.     AV_CH_SIDE_RIGHT,

  139.     AV_CH_LOW_FREQUENCY,

  140.     AV_CH_BACK_CENTER,

  141.     AV_CH_BACK_LEFT,

  142.     AV_CH_BACK_RIGHT,

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

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

  145.     AV_CH_FRONT_LEFT_OF_CENTER,

  146.     AV_CH_FRONT_RIGHT_OF_CENTER,

  147.     AV_CH_TOP_FRONT_LEFT,

  148.     AV_CH_TOP_FRONT_CENTER,

  149.     AV_CH_TOP_FRONT_RIGHT,

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

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

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

  153.     AV_CH_TOP_CENTER,           /* overhead */

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

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

  156.     AV_CH_TOP_BACK_CENTER,

  157.     AV_CH_TOP_BACK_LEFT,

  158.     AV_CH_TOP_BACK_RIGHT,

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

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

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

  162. };

  163. 

  164. enum DCAExtensionMask {

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

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

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

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

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

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

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

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

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

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

  175. };

  176. 

  177. /* -1 are reserved or unknown */

  178. static const int dca_ext_audio_descr_mask[] = {

  179.     DCA_EXT_XCH,

  180.     -1,

  181.     DCA_EXT_X96,

  182.     DCA_EXT_XCH | DCA_EXT_X96,

  183.     -1,

  184.     -1,

  185.     DCA_EXT_XXCH,

  186.     -1,

  187. };

  188. 

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

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

  191. 

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

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

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

  195.  *

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

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

  198.  * OV -> center back

  199.  * All 2 channel configurations -> AV_CH_LAYOUT_STEREO

  200.  */

  201. static const uint64_t dca_core_channel_layout[] = {

  202.     AV_CH_FRONT_CENTER,                                                     ///< 1, A

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

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

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

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

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

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

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

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

  211. 

  212.     AV_CH_LAYOUT_STEREO | AV_CH_FRONT_CENTER | AV_CH_SIDE_LEFT |

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

  214. 

  215.     AV_CH_LAYOUT_STEREO | AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT |

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

  217. 

  218.     AV_CH_LAYOUT_STEREO | AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT |

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

  220. 

  221.     AV_CH_FRONT_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER |

  222.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_BACK_CENTER   |

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

  224. 

  225.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_CENTER   |

  226.     AV_CH_FRONT_RIGHT_OF_CENTER | AV_CH_LAYOUT_STEREO |

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

  228. 

  229.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER |

  230.     AV_CH_LAYOUT_STEREO | AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT |

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

  232. 

  233.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_CENTER   |

  234.     AV_CH_FRONT_RIGHT_OF_CENTER | AV_CH_LAYOUT_STEREO |

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

  236. };

  237. 

  238. static const int8_t dca_lfe_index[] = {

  239.     1, 2, 2, 2, 2, 3, 2, 3, 2, 3, 2, 3, 1, 3, 2, 3

  240. };

  241. 

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

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

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

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

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

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

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

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

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

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

  255.     { 0,  6,  4,  5,  2,  3, -1, -1, -1},

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

  257.     { 5,  6,  0,  1,  7,  3,  8,  4, -1},

  258.     { 4,  2,  5,  0,  1,  6,  8,  7, -1},

  259. };

  260. 

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

  262.     { 0,  2, -1, -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.     { 0,  1,  3, -1, -1, -1, -1, -1, -1},

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

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

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

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

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

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

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

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

  274.     { 0,  6,  4,  5,  2,  3,  7, -1, -1},

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

  276.     { 5,  6,  0,  1,  8,  3,  9,  4,  7},

  277.     { 4,  2,  5,  0,  1,  6,  9,  8,  7},

  278. };

  279. 

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

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

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

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

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

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

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

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

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

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

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

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

  295.     { 4,  5,  0,  1,  6,  2,  7,  3, -1},

  296.     { 3,  2,  4,  0,  1,  5,  7,  6, -1},

  297. };

  298. 

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

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

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

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

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

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

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

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

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

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

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

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

  314.     { 4,  5,  0,  1,  7,  2,  8,  3,  6},

  315.     { 3,  2,  4,  0,  1,  5,  8,  7,  6},

  316. };

  317. 

  318. #define DCA_DOLBY                  101           /* FIXME */

  319. 

  320. #define DCA_CHANNEL_BITS             6

  321. #define DCA_CHANNEL_MASK          0x3F

  322. 

  323. #define DCA_LFE                   0x80

  324. 

  325. #define HEADER_SIZE                 14

  326. 

  327. #define DCA_MAX_FRAME_SIZE       16384

  328. #define DCA_MAX_EXSS_HEADER_SIZE  4096

  329. 

  330. #define DCA_BUFFER_PADDING_SIZE   1024

  331. 

  332. #define DCA_NSYNCAUX        0x9A1105A0

  333. 

  334. /** Bit allocation */

  335. typedef struct {

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

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

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

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

  340. } BitAlloc;

  341. 

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

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

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

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

  346. 

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

  348.                                          int idx)

  349. {

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

  351.            ba->offset;

  352. }

  353. 

  354. typedef struct {

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

  356.     AVCodecContext *avctx;

  357.     /* Frame header */

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

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

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

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

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

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

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

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

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

  367. 

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

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

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

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

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

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

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

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

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

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

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

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

  380.     int copy_history;           ///< copy history

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

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

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

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

  385. 

  386.     /* Primary audio coding header */

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

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

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

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

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

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

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

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

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

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

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

  398. 

  399.     /* Primary audio coding side information */

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

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

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

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

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

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

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

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

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

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

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

  411. 

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

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

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

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

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

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

  418. 

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

  420. 

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

  422.     int lfe_scale_factor;

  423. 

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

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

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

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

  428.     int hist_index[DCA_PRIM_CHANNELS_MAX];

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

  430. 

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

  432. 

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

  434.     float *samples_chanptr[DCA_PRIM_CHANNELS_MAX + 1];

  435.     float *extra_channels[DCA_PRIM_CHANNELS_MAX + 1];

  436.     uint8_t *extra_channels_buffer;

  437.     unsigned int extra_channels_buffer_size;

  438. 

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

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

  441. 

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

  443.     GetBitContext gb;

  444.     /* Current position in DCA frame */

  445.     int current_subframe;

  446.     int current_subsubframe;

  447. 

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

  449. 

  450.     /* XCh extension information */

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

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

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

  454. 

  455.     /* XXCH extension information */

  456.     int xxch_chset;

  457.     int xxch_nbits_spk_mask;

  458.     uint32_t xxch_core_spkmask;

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

  460.     int xxch_chset_nch[4];

  461.     float xxch_dmix_sf[DCA_CHSETS_MAX];

  462. 

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

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

  465. 

  466.     int8_t xxch_order_tab[32];

  467.     int8_t lfe_index;

  468. 

  469.     /* ExSS header parser */

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

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

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

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

  474. 

  475.     int profile;

  476. 

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

  478.     AVFloatDSPContext fdsp;

  479.     FFTContext imdct;

  480.     SynthFilterContext synth;

  481.     DCADSPContext dcadsp;

  482.     FmtConvertContext fmt_conv;

  483. } DCAContext;

  484. 

  485. static const uint16_t dca_vlc_offs[] = {

  486.         0,   512,   640,   768,  1282,  1794,  2436,  3080,  3770,  4454,  5364,

  487.      5372,  5380,  5388,  5392,  5396,  5412,  5420,  5428,  5460,  5492,  5508,

  488.      5572,  5604,  5668,  5796,  5860,  5892,  6412,  6668,  6796,  7308,  7564,

  489.      7820,  8076,  8620,  9132,  9388,  9910, 10166, 10680, 11196, 11726, 12240,

  490.     12752, 13298, 13810, 14326, 14840, 15500, 16022, 16540, 17158, 17678, 18264,

  491.     18796, 19352, 19926, 20468, 21472, 22398, 23014, 23622,

  492. };

  493. 

  494. static av_cold void dca_init_vlcs(void)

  495. {

  496.     static int vlcs_initialized = 0;

  497.     int i, j, c = 14;

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

  499. 

  500.     if (vlcs_initialized)

  501.         return;

  502. 

  503.     dca_bitalloc_index.offset = 1;

  504.     dca_bitalloc_index.wrap = 2;

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

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

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

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

  509.                  bitalloc_12_bits[i], 1, 1,

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

  511.     }

  512.     dca_scalefactor.offset = -64;

  513.     dca_scalefactor.wrap = 2;

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

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

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

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

  518.                  scales_bits[i], 1, 1,

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

  520.     }

  521.     dca_tmode.offset = 0;

  522.     dca_tmode.wrap = 1;

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

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

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

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

  527.                  tmode_bits[i], 1, 1,

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

  529.     }

  530. 

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

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

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

  534.                 break;

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

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

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

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

  539. 

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

  541.                      bitalloc_sizes[i],

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

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

  544.             c++;

  545.         }

  546.     vlcs_initialized = 1;

  547. }

  548. 

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

  550. {

  551.     while (len--)

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

  553. }

  554. 

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

  556. {

  557.     int i, base, mask;

  558. 

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

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

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

  562.         base += av_popcount(mask);

  563. 

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

  565. }

  566. 

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

  568.                                          int xxch)

  569. {

  570.     int i, j;

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

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

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

  574.     int hdr_pos = 0, hdr_size = 0;

  575.     float sign, mag, scale_factor;

  576.     int this_chans, acc_mask;

  577.     int embedded_downmix;

  578.     int nchans, mask[8];

  579.     int coeff, ichan;

  580. 

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

  582.     if (xxch) {

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

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

  585.     }

  586. 

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

  588.     s->total_channels = nchans + base_channel;

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

  590. 

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

  592.     if (xxch) {

  593.         acc_mask = s->xxch_core_spkmask;

  594. 

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

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

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

  598. 

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

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

  601. 

  602.         /* check for downmixing information */

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

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

  605.             scale_factor     =

  606.                1.0f / dca_dmixtable[(get_bits(&s->gb, 6) - 1) << 2];

  607. 

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

  609. 

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

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

  612.             }

  613. 

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

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

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

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

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

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

  620.                             av_log(s->avctx, AV_LOG_WARNING,

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

  622.                             continue;

  623.                         }

  624. 

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

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

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

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

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

  630.                     }

  631.                 }

  632.             }

  633.         }

  634.     }

  635. 

  636.     if (s->prim_channels > DCA_PRIM_CHANNELS_MAX)

  637.         s->prim_channels = DCA_PRIM_CHANNELS_MAX;

  638. 

  639. 

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

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

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

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

  644.     }

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

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

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

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

  649.     }

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

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

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

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

  654. 

  655.     /* Get codebooks quantization indexes */

  656.     if (!base_channel)

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

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

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

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

  661. 

  662.     /* Get scale factor adjustment */

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

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

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

  666. 

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

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

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

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

  671. 

  672.     if (!xxch) {

  673.         if (s->crc_present) {

  674.             /* Audio header CRC check */

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

  676.         }

  677.     } else {

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

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

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

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

  682.     }

  683. 

  684.     s->current_subframe    = 0;

  685.     s->current_subsubframe = 0;

  686. 

  687. #ifdef TRACE

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

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

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

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

  692.                s->subband_activity[i]);

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

  694.                s->vq_start_subband[i]);

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

  696.                s->joint_intensity[i]);

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

  698.                s->transient_huffman[i]);

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

  700.                s->scalefactor_huffman[i]);

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

  702.                s->bitalloc_huffman[i]);

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

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

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

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

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

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

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

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

  711.     }

  712. #endif

  713. 

  714.     return 0;

  715. }

  716. 

  717. static int dca_parse_frame_header(DCAContext *s)

  718. {

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

  720. 

  721.     /* Sync code */

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

  723. 

  724.     /* Frame header */

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

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

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

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

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

  730.     if (s->frame_size < 95)

  731.         return AVERROR_INVALIDDATA;

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

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

  734.     if (!s->sample_rate)

  735.         return AVERROR_INVALIDDATA;

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

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

  738.     if (!s->bit_rate)

  739.         return AVERROR_INVALIDDATA;

  740. 

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

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

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

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

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

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

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

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

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

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

  751. 

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

  753.         s->lfe = 0;

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

  755.         return AVERROR_INVALIDDATA;

  756.     }

  757. 

  758.     /* TODO: check CRC */

  759.     if (s->crc_present)

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

  761. 

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

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

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

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

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

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

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

  769. 

  770.     /* FIXME: channels mixing levels */

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

  772.     if (s->lfe)

  773.         s->output |= DCA_LFE;

  774. 

  775. #ifdef TRACE

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

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

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

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

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

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

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

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

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

  785.            s->sample_rate);

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

  787.            s->bit_rate);

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

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

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

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

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

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

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

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

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

  797.            s->predictor_history);

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

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

  800.            s->multirate_inter);

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

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

  803.     av_log(s->avctx, AV_LOG_DEBUG,

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

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

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

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

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

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

  810. #endif

  811. 

  812.     /* Primary audio coding header */

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

  814. 

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

  816. }

  817. 

  818. 

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

  820. {

  821.     if (level < 5) {

  822.         /* huffman encoded */

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

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

  825.     } else if (level < 8) {

  826.         if (level + 1 > log2range) {

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

  828.             value = get_bits(gb, log2range);

  829.         } else {

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

  831.         }

  832.     }

  833.     return value;

  834. }

  835. 

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

  837. {

  838.     /* Primary audio coding side information */

  839.     int j, k;

  840. 

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

  842.         return AVERROR_INVALIDDATA;

  843. 

  844.     if (!base_channel) {

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

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

  847.     }

  848. 

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

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

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

  852.     }

  853. 

  854.     /* Get prediction codebook */

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

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

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

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

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

  860.             }

  861.         }

  862.     }

  863. 

  864.     /* Bit allocation index */

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

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

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

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

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

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

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

  872.                 av_log(s->avctx, AV_LOG_ERROR,

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

  874.                 return AVERROR_INVALIDDATA;

  875.             } else {

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

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

  878.             }

  879. 

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

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

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

  883.                 return AVERROR_INVALIDDATA;

  884.             }

  885.         }

  886.     }

  887. 

  888.     /* Transition mode */

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

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

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

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

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

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

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

  896.             }

  897.         }

  898.     }

  899. 

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

  901.         return AVERROR_INVALIDDATA;

  902. 

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

  904.         const uint32_t *scale_table;

  905.         int scale_sum, log_size;

  906. 

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

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

  909. 

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

  911.             scale_table = scale_factor_quant7;

  912.             log_size = 7;

  913.         } else {

  914.             scale_table = scale_factor_quant6;

  915.             log_size = 6;

  916.         }

  917. 

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

  919.         scale_sum = 0;

  920. 

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

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

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

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

  925.             }

  926. 

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

  928.                 /* Get second scale factor */

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

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

  931.             }

  932.         }

  933.     }

  934. 

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

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

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

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

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

  940.     }

  941. 

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

  943.         return AVERROR_INVALIDDATA;

  944. 

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

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

  947.         int source_channel;

  948. 

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

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

  951.             int scale = 0;

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

  953. 

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

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

  956. 

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

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

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

  960.             }

  961. 

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

  963.                 av_log(s->avctx, AV_LOG_DEBUG,

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

  965.                 s->debug_flag |= 0x02;

  966.             }

  967.         }

  968.     }

  969. 

  970.     /* Dynamic range coefficient */

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

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

  973. 

  974.     /* Side information CRC check word */

  975.     if (s->crc_present) {

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

  977.     }

  978. 

  979.     /*

  980.      * Primary audio data arrays

  981.      */

  982. 

  983.     /* VQ encoded high frequency subbands */

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

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

  986.             /* 1 vector -> 32 samples */

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

  988. 

  989.     /* Low frequency effect data */

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

  991.         int quant7;

  992.         /* LFE samples */

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

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

  995.         float lfe_scale;

  996. 

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

  998.             /* Signed 8 bits int */

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

  1000.         }

  1001. 

  1002.         /* Scale factor index */

  1003.         quant7 = get_bits(&s->gb, 8);

  1004.         if (quant7 > 127) {

  1005.             avpriv_request_sample(s->avctx, "LFEScaleIndex larger than 127");

  1006.             return AVERROR_INVALIDDATA;

  1007.         }

  1008.         s->lfe_scale_factor = scale_factor_quant7[quant7];

  1009. 

  1010.         /* Quantization step size * scale factor */

  1011.         lfe_scale = 0.035 * s->lfe_scale_factor;

  1012. 

  1013.         for (j = lfe_samples; j < lfe_end_sample; j++)

  1014.             s->lfe_data[j] *= lfe_scale;

  1015.     }

  1016. 

  1017. #ifdef TRACE

  1018.     av_log(s->avctx, AV_LOG_DEBUG, "subsubframes: %i\n",

  1019.            s->subsubframes[s->current_subframe]);

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

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

  1022. 

  1023.     for (j = base_channel; j < s->prim_channels; j++) {

  1024.         av_log(s->avctx, AV_LOG_DEBUG, "prediction mode:");

  1025.         for (k = 0; k < s->subband_activity[j]; k++)

  1026.             av_log(s->avctx, AV_LOG_DEBUG, " %i", s->prediction_mode[j][k]);

  1027.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1028.     }

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

  1030.         for (k = 0; k < s->subband_activity[j]; k++)

  1031.             av_log(s->avctx, AV_LOG_DEBUG,

  1032.                    "prediction coefs: %f, %f, %f, %f\n",

  1033.                    (float) adpcm_vb[s->prediction_vq[j][k]][0] / 8192,

  1034.                    (float) adpcm_vb[s->prediction_vq[j][k]][1] / 8192,

  1035.                    (float) adpcm_vb[s->prediction_vq[j][k]][2] / 8192,

  1036.                    (float) adpcm_vb[s->prediction_vq[j][k]][3] / 8192);

  1037.     }

  1038.     for (j = base_channel; j < s->prim_channels; j++) {

  1039.         av_log(s->avctx, AV_LOG_DEBUG, "bitalloc index: ");

  1040.         for (k = 0; k < s->vq_start_subband[j]; k++)

  1041.             av_log(s->avctx, AV_LOG_DEBUG, "%2.2i ", s->bitalloc[j][k]);

  1042.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1043.     }

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

  1045.         av_log(s->avctx, AV_LOG_DEBUG, "Transition mode:");

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

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

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

  1049.     }

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

  1051.         av_log(s->avctx, AV_LOG_DEBUG, "Scale factor:");

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

  1053.             if (k >= s->vq_start_subband[j] || s->bitalloc[j][k] > 0)

  1054.                 av_log(s->avctx, AV_LOG_DEBUG, " %i", s->scale_factor[j][k][0]);

  1055.             if (k < s->vq_start_subband[j] && s->transition_mode[j][k])

  1056.                 av_log(s->avctx, AV_LOG_DEBUG, " %i(t)", s->scale_factor[j][k][1]);

  1057.         }

  1058.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1059.     }

  1060.     for (j = base_channel; j < s->prim_channels; j++) {

  1061.         if (s->joint_intensity[j] > 0) {

  1062.             int source_channel = s->joint_intensity[j] - 1;

  1063.             av_log(s->avctx, AV_LOG_DEBUG, "Joint scale factor index:\n");

  1064.             for (k = s->subband_activity[j]; k < s->subband_activity[source_channel]; k++)

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

  1066.             av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1067.         }

  1068.     }

  1069.     for (j = base_channel; j < s->prim_channels; j++)

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

  1071.             av_log(s->avctx, AV_LOG_DEBUG, "VQ index: %i\n", s->high_freq_vq[j][k]);

  1072.     if (!base_channel && s->lfe) {

  1073.         int lfe_samples = 2 * s->lfe * (4 + block_index);

  1074.         int lfe_end_sample = 2 * s->lfe * (4 + block_index + s->subsubframes[s->current_subframe]);

  1075. 

  1076.         av_log(s->avctx, AV_LOG_DEBUG, "LFE samples:\n");

  1077.         for (j = lfe_samples; j < lfe_end_sample; j++)

  1078.             av_log(s->avctx, AV_LOG_DEBUG, " %f", s->lfe_data[j]);

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

  1080.     }

  1081. #endif

  1082. 

  1083.     return 0;

  1084. }

  1085. 

  1086. static void qmf_32_subbands(DCAContext *s, int chans,

  1087.                             float samples_in[32][8], float *samples_out,

  1088.                             float scale)

  1089. {

  1090.     const float *prCoeff;

  1091. 

  1092.     int sb_act = s->subband_activity[chans];

  1093. 

  1094.     scale *= sqrt(1 / 8.0);

  1095. 

  1096.     /* Select filter */

  1097.     if (!s->multirate_inter)    /* Non-perfect reconstruction */

  1098.         prCoeff = fir_32bands_nonperfect;

  1099.     else                        /* Perfect reconstruction */

  1100.         prCoeff = fir_32bands_perfect;

  1101. 

  1102.     s->dcadsp.qmf_32_subbands(samples_in, sb_act, &s->synth, &s->imdct,

  1103.                               s->subband_fir_hist[chans],

  1104.                               &s->hist_index[chans],

  1105.                               s->subband_fir_noidea[chans], prCoeff,

  1106.                               samples_out, s->raXin, scale);

  1107. }

  1108. 

  1109. static void lfe_interpolation_fir(DCAContext *s, int decimation_select,

  1110.                                   int num_deci_sample, float *samples_in,

  1111.                                   float *samples_out, float scale)

  1112. {

  1113.     /* samples_in: An array holding decimated samples.

  1114.      *   Samples in current subframe starts from samples_in[0],

  1115.      *   while samples_in[-1], samples_in[-2], ..., stores samples

  1116.      *   from last subframe as history.

  1117.      *

  1118.      * samples_out: An array holding interpolated samples

  1119.      */

  1120. 

  1121.     int idx;

  1122.     const float *prCoeff;

  1123.     int deciindex;

  1124. 

  1125.     /* Select decimation filter */

  1126.     if (decimation_select == 1) {

  1127.         idx = 1;

  1128.         prCoeff = lfe_fir_128;

  1129.     } else {

  1130.         idx = 0;

  1131.         prCoeff = lfe_fir_64;

  1132.     }

  1133.     /* Interpolation */

  1134.     for (deciindex = 0; deciindex < num_deci_sample; deciindex++) {

  1135.         s->dcadsp.lfe_fir[idx](samples_out, samples_in, prCoeff, scale);

  1136.         samples_in++;

  1137.         samples_out += 2 * 32 * (1 + idx);

  1138.     }

  1139. }

  1140. 

  1141. /* downmixing routines */

  1142. #define MIX_REAR1(samples, s1, rs, coef)            \

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

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

  1145. 

  1146. #define MIX_REAR2(samples, s1, s2, rs, coef)                                          \

  1147.     samples[0][i] += samples[s1][i] * coef[rs][0] + samples[s2][i] * coef[rs + 1][0]; \

  1148.     samples[1][i] += samples[s1][i] * coef[rs][1] + samples[s2][i] * coef[rs + 1][1];

  1149. 

  1150. #define MIX_FRONT3(samples, coef)                                      \

  1151.     t = samples[c][i];                                                 \

  1152.     u = samples[l][i];                                                 \

  1153.     v = samples[r][i];                                                 \

  1154.     samples[0][i] = t * coef[0][0] + u * coef[1][0] + v * coef[2][0];  \

  1155.     samples[1][i] = t * coef[0][1] + u * coef[1][1] + v * coef[2][1];

  1156. 

  1157. #define DOWNMIX_TO_STEREO(op1, op2)             \

  1158.     for (i = 0; i < 256; i++) {                 \

  1159.         op1                                     \

  1160.         op2                                     \

  1161.     }

  1162. 

  1163. static void dca_downmix(float **samples, int srcfmt, int lfe_present,

  1164.                         float coef[DCA_PRIM_CHANNELS_MAX + 1][2],

  1165.                         const int8_t *channel_mapping)

  1166. {

  1167.     int c, l, r, sl, sr, s;

  1168.     int i;

  1169.     float t, u, v;

  1170. 

  1171.     switch (srcfmt) {

  1172.     case DCA_MONO:

  1173.     case DCA_4F2R:

  1174.         av_log(NULL, AV_LOG_ERROR, "Not implemented!\n");

  1175.         break;

  1176.     case DCA_CHANNEL:

  1177.     case DCA_STEREO:

  1178.     case DCA_STEREO_TOTAL:

  1179.     case DCA_STEREO_SUMDIFF:

  1180.         break;

  1181.     case DCA_3F:

  1182.         c = channel_mapping[0];

  1183.         l = channel_mapping[1];

  1184.         r = channel_mapping[2];

  1185.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef), );

  1186.         break;

  1187.     case DCA_2F1R:

  1188.         s = channel_mapping[2];

  1189.         DOWNMIX_TO_STEREO(MIX_REAR1(samples, s, 2, coef), );

  1190.         break;

  1191.     case DCA_3F1R:

  1192.         c = channel_mapping[0];

  1193.         l = channel_mapping[1];

  1194.         r = channel_mapping[2];

  1195.         s = channel_mapping[3];

  1196.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),

  1197.                           MIX_REAR1(samples, s, 3, coef));

  1198.         break;

  1199.     case DCA_2F2R:

  1200.         sl = channel_mapping[2];

  1201.         sr = channel_mapping[3];

  1202.         DOWNMIX_TO_STEREO(MIX_REAR2(samples, sl, sr, 2, coef), );

  1203.         break;

  1204.     case DCA_3F2R:

  1205.         c  = channel_mapping[0];

  1206.         l  = channel_mapping[1];

  1207.         r  = channel_mapping[2];

  1208.         sl = channel_mapping[3];

  1209.         sr = channel_mapping[4];

  1210.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),

  1211.                           MIX_REAR2(samples, sl, sr, 3, coef));

  1212.         break;

  1213.     }

  1214.     if (lfe_present) {

  1215.         int lf_buf = dca_lfe_index[srcfmt];

  1216.         int lf_idx = dca_channels [srcfmt];

  1217.         for (i = 0; i < 256; i++) {

  1218.             samples[0][i] += samples[lf_buf][i] * coef[lf_idx][0];

  1219.             samples[1][i] += samples[lf_buf][i] * coef[lf_idx][1];

  1220.         }

  1221.     }

  1222. }

  1223. 

  1224. 

  1225. #ifndef decode_blockcodes

  1226. /* Very compact version of the block code decoder that does not use table

  1227.  * look-up but is slightly slower */

  1228. static int decode_blockcode(int code, int levels, int32_t *values)

  1229. {

  1230.     int i;

  1231.     int offset = (levels - 1) >> 1;

  1232. 

  1233.     for (i = 0; i < 4; i++) {

  1234.         int div = FASTDIV(code, levels);

  1235.         values[i] = code - offset - div * levels;

  1236.         code = div;

  1237.     }

  1238. 

  1239.     return code;

  1240. }

  1241. 

  1242. static int decode_blockcodes(int code1, int code2, int levels, int32_t *values)

  1243. {

  1244.     return decode_blockcode(code1, levels, values) |

  1245.            decode_blockcode(code2, levels, values + 4);

  1246. }

  1247. #endif

  1248. 

  1249. static const uint8_t abits_sizes[7]  = { 7, 10, 12, 13, 15, 17, 19 };

  1250. static const uint8_t abits_levels[7] = { 3,  5,  7,  9, 13, 17, 25 };

  1251. 

  1252. #ifndef int8x8_fmul_int32

  1253. static inline void int8x8_fmul_int32(DCADSPContext *dsp, float *dst,

  1254.                                      const int8_t *src, int scale)

  1255. {

  1256.     dsp->int8x8_fmul_int32(dst, src, scale);

  1257. }

  1258. #endif

  1259. 

  1260. static int dca_subsubframe(DCAContext *s, int base_channel, int block_index)

  1261. {

  1262.     int k, l;

  1263.     int subsubframe = s->current_subsubframe;

  1264. 

  1265.     const float *quant_step_table;

  1266. 

  1267.     /* FIXME */

  1268.     float (*subband_samples)[DCA_SUBBANDS][8] = s->subband_samples[block_index];

  1269.     LOCAL_ALIGNED_16(int32_t, block, [8 * DCA_SUBBANDS]);

  1270. 

  1271.     /*

  1272.      * Audio data

  1273.      */

  1274. 

  1275.     /* Select quantization step size table */

  1276.     if (s->bit_rate_index == 0x1f)

  1277.         quant_step_table = lossless_quant_d;

  1278.     else

  1279.         quant_step_table = lossy_quant_d;

  1280. 

  1281.     for (k = base_channel; k < s->prim_channels; k++) {

  1282.         float rscale[DCA_SUBBANDS];

  1283. 

  1284.         if (get_bits_left(&s->gb) < 0)

  1285.             return AVERROR_INVALIDDATA;

  1286. 

  1287.         for (l = 0; l < s->vq_start_subband[k]; l++) {

  1288.             int m;

  1289. 

  1290.             /* Select the mid-tread linear quantizer */

  1291.             int abits = s->bitalloc[k][l];

  1292. 

  1293.             float quant_step_size = quant_step_table[abits];

  1294. 

  1295.             /*

  1296.              * Determine quantization index code book and its type

  1297.              */

  1298. 

  1299.             /* Select quantization index code book */

  1300.             int sel = s->quant_index_huffman[k][abits];

  1301. 

  1302.             /*

  1303.              * Extract bits from the bit stream

  1304.              */

  1305.             if (!abits) {

  1306.                 rscale[l] = 0;

  1307.                 memset(block + 8 * l, 0, 8 * sizeof(block[0]));

  1308.             } else {

  1309.                 /* Deal with transients */

  1310.                 int sfi = s->transition_mode[k][l] && subsubframe >= s->transition_mode[k][l];

  1311.                 rscale[l] = quant_step_size * s->scale_factor[k][l][sfi] *

  1312.                                s->scalefactor_adj[k][sel];

  1313. 

  1314.                 if (abits >= 11 || !dca_smpl_bitalloc[abits].vlc[sel].table) {

  1315.                     if (abits <= 7) {

  1316.                         /* Block code */

  1317.                         int block_code1, block_code2, size, levels, err;

  1318. 

  1319.                         size   = abits_sizes[abits - 1];

  1320.                         levels = abits_levels[abits - 1];

  1321. 

  1322.                         block_code1 = get_bits(&s->gb, size);

  1323.                         block_code2 = get_bits(&s->gb, size);

  1324.                         err = decode_blockcodes(block_code1, block_code2,

  1325.                                                 levels, block + 8 * l);

  1326.                         if (err) {

  1327.                             av_log(s->avctx, AV_LOG_ERROR,

  1328.                                    "ERROR: block code look-up failed\n");

  1329.                             return AVERROR_INVALIDDATA;

  1330.                         }

  1331.                     } else {

  1332.                         /* no coding */

  1333.                         for (m = 0; m < 8; m++)

  1334.                             block[8 * l + m] = get_sbits(&s->gb, abits - 3);

  1335.                     }

  1336.                 } else {

  1337.                     /* Huffman coded */

  1338.                     for (m = 0; m < 8; m++)

  1339.                         block[8 * l + m] = get_bitalloc(&s->gb,

  1340.                                                 &dca_smpl_bitalloc[abits], sel);

  1341.                 }

  1342. 

  1343.             }

  1344.         }

  1345. 

  1346.         s->fmt_conv.int32_to_float_fmul_array8(&s->fmt_conv, subband_samples[k][0],

  1347.                                                block, rscale, 8 * s->vq_start_subband[k]);

  1348. 

  1349.         for (l = 0; l < s->vq_start_subband[k]; l++) {

  1350.             int m;

  1351.             /*

  1352.              * Inverse ADPCM if in prediction mode

  1353.              */

  1354.             if (s->prediction_mode[k][l]) {

  1355.                 int n;

  1356.                 for (m = 0; m < 8; m++) {

  1357.                     for (n = 1; n <= 4; n++)

  1358.                         if (m >= n)

  1359.                             subband_samples[k][l][m] +=

  1360.                                 (adpcm_vb[s->prediction_vq[k][l]][n - 1] *

  1361.                                  subband_samples[k][l][m - n] / 8192);

  1362.                         else if (s->predictor_history)

  1363.                             subband_samples[k][l][m] +=

  1364.                                 (adpcm_vb[s->prediction_vq[k][l]][n - 1] *

  1365.                                  s->subband_samples_hist[k][l][m - n + 4] / 8192);

  1366.                 }

  1367.             }

  1368.         }

  1369. 

  1370.         /*

  1371.          * Decode VQ encoded high frequencies

  1372.          */

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

  1374.             /* 1 vector -> 32 samples but we only need the 8 samples

  1375.              * for this subsubframe. */

  1376.             int hfvq = s->high_freq_vq[k][l];

  1377. 

  1378.             if (!s->debug_flag & 0x01) {

  1379.                 av_log(s->avctx, AV_LOG_DEBUG,

  1380.                        "Stream with high frequencies VQ coding\n");

  1381.                 s->debug_flag |= 0x01;

  1382.             }

  1383. 

  1384.             int8x8_fmul_int32(&s->dcadsp, subband_samples[k][l],

  1385.                               &high_freq_vq[hfvq][subsubframe * 8],

  1386.                               s->scale_factor[k][l][0]);

  1387.         }

  1388.     }

  1389. 

  1390.     /* Check for DSYNC after subsubframe */

  1391.     if (s->aspf || subsubframe == s->subsubframes[s->current_subframe] - 1) {

  1392.         if (0xFFFF == get_bits(&s->gb, 16)) {   /* 0xFFFF */

  1393. #ifdef TRACE

  1394.             av_log(s->avctx, AV_LOG_DEBUG, "Got subframe DSYNC\n");

  1395. #endif

  1396.         } else {

  1397.             av_log(s->avctx, AV_LOG_ERROR, "Didn't get subframe DSYNC\n");

  1398.             return AVERROR_INVALIDDATA;

  1399.         }

  1400.     }

  1401. 

  1402.     /* Backup predictor history for adpcm */

  1403.     for (k = base_channel; k < s->prim_channels; k++)

  1404.         for (l = 0; l < s->vq_start_subband[k]; l++)

  1405.             AV_COPY128(s->subband_samples_hist[k][l], &subband_samples[k][l][4]);

  1406. 

  1407.     return 0;

  1408. }

  1409. 

  1410. static int dca_filter_channels(DCAContext *s, int block_index)

  1411. {

  1412.     float (*subband_samples)[DCA_SUBBANDS][8] = s->subband_samples[block_index];

  1413.     int k;

  1414. 

  1415.     /* 32 subbands QMF */

  1416.     for (k = 0; k < s->prim_channels; k++) {

  1417. /*        static float pcm_to_double[8] = { 32768.0, 32768.0, 524288.0, 524288.0,

  1418.                                             0, 8388608.0, 8388608.0 };*/

  1419.         if (s->channel_order_tab[k] >= 0)

  1420.             qmf_32_subbands(s, k, subband_samples[k],

  1421.                             s->samples_chanptr[s->channel_order_tab[k]],

  1422.                             M_SQRT1_2 / 32768.0 /* pcm_to_double[s->source_pcm_res] */);

  1423.     }

  1424. 

  1425.     /* Generate LFE samples for this subsubframe FIXME!!! */

  1426.     if (s->lfe) {

  1427.         lfe_interpolation_fir(s, s->lfe, 2 * s->lfe,

  1428.                               s->lfe_data + 2 * s->lfe * (block_index + 4),

  1429.                               s->samples_chanptr[s->lfe_index],

  1430.                               1.0 / (256.0 * 32768.0));

  1431.         /* Outputs 20bits pcm samples */

  1432.     }

  1433. 

  1434.     /* Downmixing to Stereo */

  1435.     if (s->prim_channels + !!s->lfe > 2 &&

  1436.         s->avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {

  1437.         dca_downmix(s->samples_chanptr, s->amode, !!s->lfe, s->downmix_coef,

  1438.                     s->channel_order_tab);

  1439.     }

  1440. 

  1441.     return 0;

  1442. }

  1443. 

  1444. 

  1445. static int dca_subframe_footer(DCAContext *s, int base_channel)

  1446. {

  1447.     int in, out, aux_data_count, aux_data_end, reserved;

  1448.     uint32_t nsyncaux;

  1449. 

  1450.     /*

  1451.      * Unpack optional information

  1452.      */

  1453. 

  1454.     /* presumably optional information only appears in the core? */

  1455.     if (!base_channel) {

  1456.         if (s->timestamp)

  1457.             skip_bits_long(&s->gb, 32);

  1458. 

  1459.         if (s->aux_data) {

  1460.             aux_data_count = get_bits(&s->gb, 6);

  1461. 

  1462.             // align (32-bit)

  1463.             skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);

  1464. 

  1465.             aux_data_end = 8 * aux_data_count + get_bits_count(&s->gb);

  1466. 

  1467.             if ((nsyncaux = get_bits_long(&s->gb, 32)) != DCA_NSYNCAUX) {

  1468.                 av_log(s->avctx, AV_LOG_ERROR, "nSYNCAUX mismatch %#"PRIx32"\n",

  1469.                        nsyncaux);

  1470.                 return AVERROR_INVALIDDATA;

  1471.             }

  1472. 

  1473.             if (get_bits1(&s->gb)) { // bAUXTimeStampFlag

  1474.                 avpriv_request_sample(s->avctx,

  1475.                                       "Auxiliary Decode Time Stamp Flag");

  1476.                 // align (4-bit)

  1477.                 skip_bits(&s->gb, (-get_bits_count(&s->gb)) & 4);

  1478.                 // 44 bits: nMSByte (8), nMarker (4), nLSByte (28), nMarker (4)

  1479.                 skip_bits_long(&s->gb, 44);

  1480.             }

  1481. 

  1482.             if ((s->core_downmix = get_bits1(&s->gb))) {

  1483.                 int am = get_bits(&s->gb, 3);

  1484.                 switch (am) {

  1485.                 case 0:

  1486.                     s->core_downmix_amode = DCA_MONO;

  1487.                     break;

  1488.                 case 1:

  1489.                     s->core_downmix_amode = DCA_STEREO;

  1490.                     break;

  1491.                 case 2:

  1492.                     s->core_downmix_amode = DCA_STEREO_TOTAL;

  1493.                     break;

  1494.                 case 3:

  1495.                     s->core_downmix_amode = DCA_3F;

  1496.                     break;

  1497.                 case 4:

  1498.                     s->core_downmix_amode = DCA_2F1R;

  1499.                     break;

  1500.                 case 5:

  1501.                     s->core_downmix_amode = DCA_2F2R;

  1502.                     break;

  1503.                 case 6:

  1504.                     s->core_downmix_amode = DCA_3F1R;

  1505.                     break;

  1506.                 default:

  1507.                     av_log(s->avctx, AV_LOG_ERROR,

  1508.                            "Invalid mode %d for embedded downmix coefficients\n",

  1509.                            am);

  1510.                     return AVERROR_INVALIDDATA;

  1511.                 }

  1512.                 for (out = 0; out < dca_channels[s->core_downmix_amode]; out++) {

  1513.                     for (in = 0; in < s->prim_channels + !!s->lfe; in++) {

  1514.                         uint16_t tmp = get_bits(&s->gb, 9);

  1515.                         if ((tmp & 0xFF) > 241) {

  1516.                             av_log(s->avctx, AV_LOG_ERROR,

  1517.                                    "Invalid downmix coefficient code %"PRIu16"\n",

  1518.                                    tmp);

  1519.                             return AVERROR_INVALIDDATA;

  1520.                         }

  1521.                         s->core_downmix_codes[in][out] = tmp;

  1522.                     }

  1523.                 }

  1524.             }

  1525. 

  1526.             align_get_bits(&s->gb); // byte align

  1527.             skip_bits(&s->gb, 16);  // nAUXCRC16

  1528. 

  1529.             // additional data (reserved, cf. ETSI TS 102 114 V1.4.1)

  1530.             if ((reserved = (aux_data_end - get_bits_count(&s->gb))) < 0) {

  1531.                  av_log(s->avctx, AV_LOG_ERROR,

  1532.                         "Overread auxiliary data by %d bits\n", -reserved);

  1533.                 return AVERROR_INVALIDDATA;

  1534.             } else if (reserved) {

  1535.                 avpriv_request_sample(s->avctx,

  1536.                                       "Core auxiliary data reserved content");

  1537.                 skip_bits_long(&s->gb, reserved);

  1538.             }

  1539.         }

  1540. 

  1541.         if (s->crc_present && s->dynrange)

  1542.             get_bits(&s->gb, 16);

  1543.     }

  1544. 

  1545.     return 0;

  1546. }

  1547. 

  1548. /**

  1549.  * Decode a dca frame block

  1550.  *

  1551.  * @param s     pointer to the DCAContext

  1552.  */

  1553. 

  1554. static int dca_decode_block(DCAContext *s, int base_channel, int block_index)

  1555. {

  1556.     int ret;

  1557. 

  1558.     /* Sanity check */

  1559.     if (s->current_subframe >= s->subframes) {

  1560.         av_log(s->avctx, AV_LOG_DEBUG, "check failed: %i>%i",

  1561.                s->current_subframe, s->subframes);

  1562.         return AVERROR_INVALIDDATA;

  1563.     }

  1564. 

  1565.     if (!s->current_subsubframe) {

  1566. #ifdef TRACE

  1567.         av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subframe_header\n");

  1568. #endif

  1569.         /* Read subframe header */

  1570.         if ((ret = dca_subframe_header(s, base_channel, block_index)))

  1571.             return ret;

  1572.     }

  1573. 

  1574.     /* Read subsubframe */

  1575. #ifdef TRACE

  1576.     av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subsubframe\n");

  1577. #endif

  1578.     if ((ret = dca_subsubframe(s, base_channel, block_index)))

  1579.         return ret;

  1580. 

  1581.     /* Update state */

  1582.     s->current_subsubframe++;

  1583.     if (s->current_subsubframe >= s->subsubframes[s->current_subframe]) {

  1584.         s->current_subsubframe = 0;

  1585.         s->current_subframe++;

  1586.     }

  1587.     if (s->current_subframe >= s->subframes) {

  1588. #ifdef TRACE

  1589.         av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subframe_footer\n");

  1590. #endif

  1591.         /* Read subframe footer */

  1592.         if ((ret = dca_subframe_footer(s, base_channel)))

  1593.             return ret;

  1594.     }

  1595. 

  1596.     return 0;

  1597. }

  1598. 

  1599. /**

  1600.  * Return the number of channels in an ExSS speaker mask (HD)

  1601.  */

  1602. static int dca_exss_mask2count(int mask)

  1603. {

  1604.     /* count bits that mean speaker pairs twice */

  1605.     return av_popcount(mask) +

  1606.            av_popcount(mask & (DCA_EXSS_CENTER_LEFT_RIGHT      |

  1607.                                DCA_EXSS_FRONT_LEFT_RIGHT       |

  1608.                                DCA_EXSS_FRONT_HIGH_LEFT_RIGHT  |

  1609.                                DCA_EXSS_WIDE_LEFT_RIGHT        |

  1610.                                DCA_EXSS_SIDE_LEFT_RIGHT        |

  1611.                                DCA_EXSS_SIDE_HIGH_LEFT_RIGHT   |

  1612.                                DCA_EXSS_SIDE_REAR_LEFT_RIGHT   |

  1613.                                DCA_EXSS_REAR_LEFT_RIGHT        |

  1614.                                DCA_EXSS_REAR_HIGH_LEFT_RIGHT));

  1615. }

  1616. 

  1617. /**

  1618.  * Skip mixing coefficients of a single mix out configuration (HD)

  1619.  */

  1620. static void dca_exss_skip_mix_coeffs(GetBitContext *gb, int channels, int out_ch)

  1621. {

  1622.     int i;

  1623. 

  1624.     for (i = 0; i < channels; i++) {

  1625.         int mix_map_mask = get_bits(gb, out_ch);

  1626.         int num_coeffs = av_popcount(mix_map_mask);

  1627.         skip_bits_long(gb, num_coeffs * 6);

  1628.     }

  1629. }

  1630. 

  1631. /**

  1632.  * Parse extension substream asset header (HD)

  1633.  */

  1634. static int dca_exss_parse_asset_header(DCAContext *s)

  1635. {

  1636.     int header_pos = get_bits_count(&s->gb);

  1637.     int header_size;

  1638.     int channels = 0;

  1639.     int embedded_stereo = 0;

  1640.     int embedded_6ch    = 0;

  1641.     int drc_code_present;

  1642.     int av_uninit(extensions_mask);

  1643.     int i, j;

  1644. 

  1645.     if (get_bits_left(&s->gb) < 16)

  1646.         return -1;

  1647. 

  1648.     /* We will parse just enough to get to the extensions bitmask with which

  1649.      * we can set the profile value. */

  1650. 

  1651.     header_size = get_bits(&s->gb, 9) + 1;

  1652.     skip_bits(&s->gb, 3); // asset index

  1653. 

  1654.     if (s->static_fields) {

  1655.         if (get_bits1(&s->gb))

  1656.             skip_bits(&s->gb, 4); // asset type descriptor

  1657.         if (get_bits1(&s->gb))

  1658.             skip_bits_long(&s->gb, 24); // language descriptor

  1659. 

  1660.         if (get_bits1(&s->gb)) {

  1661.             /* How can one fit 1024 bytes of text here if the maximum value

  1662.              * for the asset header size field above was 512 bytes? */

  1663.             int text_length = get_bits(&s->gb, 10) + 1;

  1664.             if (get_bits_left(&s->gb) < text_length * 8)

  1665.                 return -1;

  1666.             skip_bits_long(&s->gb, text_length * 8); // info text

  1667.         }

  1668. 

  1669.         skip_bits(&s->gb, 5); // bit resolution - 1

  1670.         skip_bits(&s->gb, 4); // max sample rate code

  1671.         channels = get_bits(&s->gb, 8) + 1;

  1672. 

  1673.         if (get_bits1(&s->gb)) { // 1-to-1 channels to speakers

  1674.             int spkr_remap_sets;

  1675.             int spkr_mask_size = 16;

  1676.             int num_spkrs[7];

  1677. 

  1678.             if (channels > 2)

  1679.                 embedded_stereo = get_bits1(&s->gb);

  1680.             if (channels > 6)

  1681.                 embedded_6ch = get_bits1(&s->gb);

  1682. 

  1683.             if (get_bits1(&s->gb)) {

  1684.                 spkr_mask_size = (get_bits(&s->gb, 2) + 1) << 2;

  1685.                 skip_bits(&s->gb, spkr_mask_size); // spkr activity mask

  1686.             }

  1687. 

  1688.             spkr_remap_sets = get_bits(&s->gb, 3);

  1689. 

  1690.             for (i = 0; i < spkr_remap_sets; i++) {

  1691.                 /* std layout mask for each remap set */

  1692.                 num_spkrs[i] = dca_exss_mask2count(get_bits(&s->gb, spkr_mask_size));

  1693.             }

  1694. 

  1695.             for (i = 0; i < spkr_remap_sets; i++) {

  1696.                 int num_dec_ch_remaps = get_bits(&s->gb, 5) + 1;

  1697.                 if (get_bits_left(&s->gb) < 0)

  1698.                     return -1;

  1699. 

  1700.                 for (j = 0; j < num_spkrs[i]; j++) {

  1701.                     int remap_dec_ch_mask = get_bits_long(&s->gb, num_dec_ch_remaps);

  1702.                     int num_dec_ch = av_popcount(remap_dec_ch_mask);

  1703.                     skip_bits_long(&s->gb, num_dec_ch * 5); // remap codes

  1704.                 }

  1705.             }

  1706. 

  1707.         } else {

  1708.             skip_bits(&s->gb, 3); // representation type

  1709.         }

  1710.     }

  1711. 

  1712.     drc_code_present = get_bits1(&s->gb);

  1713.     if (drc_code_present)

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

  1715. 

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

  1717.         skip_bits(&s->gb, 5); // dialog normalization code

  1718. 

  1719.     if (drc_code_present && embedded_stereo)

  1720.         get_bits(&s->gb, 8); // drc stereo code

  1721. 

  1722.     if (s->mix_metadata && get_bits1(&s->gb)) {

  1723.         skip_bits(&s->gb, 1); // external mix

  1724.         skip_bits(&s->gb, 6); // post mix gain code

  1725. 

  1726.         if (get_bits(&s->gb, 2) != 3) // mixer drc code

  1727.             skip_bits(&s->gb, 3); // drc limit

  1728.         else

  1729.             skip_bits(&s->gb, 8); // custom drc code

  1730. 

  1731.         if (get_bits1(&s->gb)) // channel specific scaling

  1732.             for (i = 0; i < s->num_mix_configs; i++)

  1733.                 skip_bits_long(&s->gb, s->mix_config_num_ch[i] * 6); // scale codes

  1734.         else

  1735.             skip_bits_long(&s->gb, s->num_mix_configs * 6); // scale codes

  1736. 

  1737.         for (i = 0; i < s->num_mix_configs; i++) {

  1738.             if (get_bits_left(&s->gb) < 0)

  1739.                 return -1;

  1740.             dca_exss_skip_mix_coeffs(&s->gb, channels, s->mix_config_num_ch[i]);

  1741.             if (embedded_6ch)

  1742.                 dca_exss_skip_mix_coeffs(&s->gb, 6, s->mix_config_num_ch[i]);

  1743.             if (embedded_stereo)

  1744.                 dca_exss_skip_mix_coeffs(&s->gb, 2, s->mix_config_num_ch[i]);

  1745.         }

  1746.     }

  1747. 

  1748.     switch (get_bits(&s->gb, 2)) {

  1749.     case 0: extensions_mask = get_bits(&s->gb, 12); break;

  1750.     case 1: extensions_mask = DCA_EXT_EXSS_XLL;     break;

  1751.     case 2: extensions_mask = DCA_EXT_EXSS_LBR;     break;

  1752.     case 3: extensions_mask = 0; /* aux coding */   break;

  1753.     }

  1754. 

  1755.     /* not parsed further, we were only interested in the extensions mask */

  1756. 

  1757.     if (get_bits_left(&s->gb) < 0)

  1758.         return -1;

  1759. 

  1760.     if (get_bits_count(&s->gb) - header_pos > header_size * 8) {

  1761.         av_log(s->avctx, AV_LOG_WARNING, "Asset header size mismatch.\n");

  1762.         return -1;

  1763.     }

  1764.     skip_bits_long(&s->gb, header_pos + header_size * 8 - get_bits_count(&s->gb));

  1765. 

  1766.     if (extensions_mask & DCA_EXT_EXSS_XLL)

  1767.         s->profile = FF_PROFILE_DTS_HD_MA;

  1768.     else if (extensions_mask & (DCA_EXT_EXSS_XBR | DCA_EXT_EXSS_X96 |

  1769.                                 DCA_EXT_EXSS_XXCH))

  1770.         s->profile = FF_PROFILE_DTS_HD_HRA;

  1771. 

  1772.     if (!(extensions_mask & DCA_EXT_CORE))

  1773.         av_log(s->avctx, AV_LOG_WARNING, "DTS core detection mismatch.\n");

  1774.     if ((extensions_mask & DCA_CORE_EXTS) != s->core_ext_mask)

  1775.         av_log(s->avctx, AV_LOG_WARNING,

  1776.                "DTS extensions detection mismatch (%d, %d)\n",

  1777.                extensions_mask & DCA_CORE_EXTS, s->core_ext_mask);

  1778. 

  1779.     return 0;

  1780. }

  1781. 

  1782. static int dca_xbr_parse_frame(DCAContext *s)

  1783. {

  1784.     int scale_table_high[DCA_CHSET_CHANS_MAX][DCA_SUBBANDS][2];

  1785.     int active_bands[DCA_CHSETS_MAX][DCA_CHSET_CHANS_MAX];

  1786.     int abits_high[DCA_CHSET_CHANS_MAX][DCA_SUBBANDS];

  1787.     int anctemp[DCA_CHSET_CHANS_MAX];

  1788.     int chset_fsize[DCA_CHSETS_MAX];

  1789.     int n_xbr_ch[DCA_CHSETS_MAX];

  1790.     int hdr_size, num_chsets, xbr_tmode, hdr_pos;

  1791.     int i, j, k, l, chset, chan_base;

  1792. 

  1793.     av_log(s->avctx, AV_LOG_DEBUG, "DTS-XBR: decoding XBR extension\n");

  1794. 

  1795.     /* get bit position of sync header */

  1796.     hdr_pos = get_bits_count(&s->gb) - 32;

  1797. 

  1798.     hdr_size = get_bits(&s->gb, 6) + 1;

  1799.     num_chsets = get_bits(&s->gb, 2) + 1;

  1800. 

  1801.     for(i = 0; i < num_chsets; i++)

  1802.         chset_fsize[i] = get_bits(&s->gb, 14) + 1;

  1803. 

  1804.     xbr_tmode = get_bits1(&s->gb);

  1805. 

  1806.     for(i = 0; i < num_chsets; i++) {

  1807.         n_xbr_ch[i] = get_bits(&s->gb, 3) + 1;

  1808.         k = get_bits(&s->gb, 2) + 5;

  1809.         for(j = 0; j < n_xbr_ch[i]; j++)

  1810.             active_bands[i][j] = get_bits(&s->gb, k) + 1;

  1811.     }

  1812. 

  1813.     /* skip to the end of the header */

  1814.     i = get_bits_count(&s->gb);

  1815.     if(hdr_pos + hdr_size * 8 > i)

  1816.         skip_bits_long(&s->gb, hdr_pos + hdr_size * 8 - i);

  1817. 

  1818.     /* loop over the channel data sets */

  1819.     /* only decode as many channels as we've decoded base data for */

  1820.     for(chset = 0, chan_base = 0;

  1821.         chset < num_chsets && chan_base + n_xbr_ch[chset] <= s->prim_channels;

  1822.         chan_base += n_xbr_ch[chset++]) {

  1823.         int start_posn = get_bits_count(&s->gb);

  1824.         int subsubframe = 0;

  1825.         int subframe = 0;

  1826. 

  1827.         /* loop over subframes */

  1828.         for (k = 0; k < (s->sample_blocks / 8); k++) {

  1829.             /* parse header if we're on first subsubframe of a block */

  1830.             if(subsubframe == 0) {

  1831.                 /* Parse subframe header */

  1832.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1833.                     anctemp[i] = get_bits(&s->gb, 2) + 2;

  1834.                 }

  1835. 

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

  1837.                     get_array(&s->gb, abits_high[i], active_bands[chset][i], anctemp[i]);

  1838.                 }

  1839. 

  1840.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1841.                     anctemp[i] = get_bits(&s->gb, 3);

  1842.                     if(anctemp[i] < 1) {

  1843.                         av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: SYNC ERROR\n");

  1844.                         return AVERROR_INVALIDDATA;

  1845.                     }

  1846.                 }

  1847. 

  1848.                 /* generate scale factors */

  1849.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1850.                     const uint32_t *scale_table;

  1851.                     int nbits;

  1852. 

  1853.                     if (s->scalefactor_huffman[chan_base+i] == 6) {

  1854.                         scale_table = scale_factor_quant7;

  1855.                     } else {

  1856.                         scale_table = scale_factor_quant6;

  1857.                     }

  1858. 

  1859.                     nbits = anctemp[i];

  1860. 

  1861.                     for(j = 0; j < active_bands[chset][i]; j++) {

  1862.                         if(abits_high[i][j] > 0) {

  1863.                             scale_table_high[i][j][0] =

  1864.                                 scale_table[get_bits(&s->gb, nbits)];

  1865. 

  1866.                             if(xbr_tmode && s->transition_mode[i][j]) {

  1867.                                 scale_table_high[i][j][1] =

  1868.                                     scale_table[get_bits(&s->gb, nbits)];

  1869.                             }

  1870.                         }

  1871.                     }

  1872.                 }

  1873.             }

  1874. 

  1875.             /* decode audio array for this block */

  1876.             for(i = 0; i < n_xbr_ch[chset]; i++) {

  1877.                 for(j = 0; j < active_bands[chset][i]; j++) {

  1878.                     const int xbr_abits = abits_high[i][j];

  1879.                     const float quant_step_size = lossless_quant_d[xbr_abits];

  1880.                     const int sfi = xbr_tmode && s->transition_mode[i][j] && subsubframe >= s->transition_mode[i][j];

  1881.                     const float rscale = quant_step_size * scale_table_high[i][j][sfi];

  1882.                     float *subband_samples = s->subband_samples[k][chan_base+i][j];

  1883.                     int block[8];

  1884. 

  1885.                     if(xbr_abits <= 0)

  1886.                         continue;

  1887. 

  1888.                     if(xbr_abits > 7) {

  1889.                         get_array(&s->gb, block, 8, xbr_abits - 3);

  1890.                     } else {

  1891.                         int block_code1, block_code2, size, levels, err;

  1892. 

  1893.                         size   = abits_sizes[xbr_abits - 1];

  1894.                         levels = abits_levels[xbr_abits - 1];

  1895. 

  1896.                         block_code1 = get_bits(&s->gb, size);

  1897.                         block_code2 = get_bits(&s->gb, size);

  1898.                         err = decode_blockcodes(block_code1, block_code2,

  1899.                                                 levels, block);

  1900.                         if (err) {

  1901.                             av_log(s->avctx, AV_LOG_ERROR,

  1902.                                    "ERROR: DTS-XBR: block code look-up failed\n");

  1903.                             return AVERROR_INVALIDDATA;

  1904.                         }

  1905.                     }

  1906. 

  1907.                     /* scale & sum into subband */

  1908.                     for(l = 0; l < 8; l++)

  1909.                         subband_samples[l] += (float)block[l] * rscale;

  1910.                 }

  1911.             }

  1912. 

  1913.             /* check DSYNC marker */

  1914.             if(s->aspf || subsubframe == s->subsubframes[subframe] - 1) {

  1915.                 if(get_bits(&s->gb, 16) != 0xffff) {

  1916.                     av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: Didn't get subframe DSYNC\n");

  1917.                     return AVERROR_INVALIDDATA;

  1918.                 }

  1919.             }

  1920. 

  1921.             /* advance sub-sub-frame index */

  1922.             if(++subsubframe >= s->subsubframes[subframe]) {

  1923.                 subsubframe = 0;

  1924.                 subframe++;

  1925.             }

  1926.         }

  1927. 

  1928.         /* skip to next channel set */

  1929.         i = get_bits_count(&s->gb);

  1930.         if(start_posn + chset_fsize[chset] * 8 != i) {

  1931.             j = start_posn + chset_fsize[chset] * 8 - i;

  1932.             if(j < 0 || j >= 8)

  1933.                 av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: end of channel set,"

  1934.                        " skipping further than expected (%d bits)\n", j);

  1935.             skip_bits_long(&s->gb, j);

  1936.         }

  1937.     }

  1938. 

  1939.     return 0;

  1940. }

  1941. 

  1942. /* parse initial header for XXCH and dump details */

  1943. static int dca_xxch_decode_frame(DCAContext *s)

  1944. {

  1945.     int hdr_size, spkmsk_bits, num_chsets, core_spk, hdr_pos;

  1946.     int i, chset, base_channel, chstart, fsize[8];

  1947. 

  1948.     /* assume header word has already been parsed */

  1949.     hdr_pos     = get_bits_count(&s->gb) - 32;

  1950.     hdr_size    = get_bits(&s->gb, 6) + 1;

  1951.   /*chhdr_crc   =*/ skip_bits1(&s->gb);

  1952.     spkmsk_bits = get_bits(&s->gb, 5) + 1;

  1953.     num_chsets  = get_bits(&s->gb, 2) + 1;

  1954. 

  1955.     for (i = 0; i < num_chsets; i++)

  1956.         fsize[i] = get_bits(&s->gb, 14) + 1;

  1957. 

  1958.     core_spk               = get_bits(&s->gb, spkmsk_bits);

  1959.     s->xxch_core_spkmask   = core_spk;

  1960.     s->xxch_nbits_spk_mask = spkmsk_bits;

  1961.     s->xxch_dmix_embedded  = 0;

  1962. 

  1963.     /* skip to the end of the header */

  1964.     i = get_bits_count(&s->gb);

  1965.     if (hdr_pos + hdr_size * 8 > i)

  1966.         skip_bits_long(&s->gb, hdr_pos + hdr_size * 8 - i);

  1967. 

  1968.     for (chset = 0; chset < num_chsets; chset++) {

  1969.         chstart       = get_bits_count(&s->gb);

  1970.         base_channel  = s->prim_channels;

  1971.         s->xxch_chset = chset;

  1972. 

  1973.         /* XXCH and Core headers differ, see 6.4.2 "XXCH Channel Set Header" vs.

  1974.            5.3.2 "Primary Audio Coding Header", DTS Spec 1.3.1 */

  1975.         dca_parse_audio_coding_header(s, base_channel, 1);

  1976. 

  1977.         /* decode channel data */

  1978.         for (i = 0; i < (s->sample_blocks / 8); i++) {

  1979.             if (dca_decode_block(s, base_channel, i)) {

  1980.                 av_log(s->avctx, AV_LOG_ERROR,

  1981.                        "Error decoding DTS-XXCH extension\n");

  1982.                 continue;

  1983.             }

  1984.         }

  1985. 

  1986.         /* skip to end of this section */

  1987.         i = get_bits_count(&s->gb);

  1988.         if (chstart + fsize[chset] * 8 > i)

  1989.             skip_bits_long(&s->gb, chstart + fsize[chset] * 8 - i);

  1990.     }

  1991.     s->xxch_chset = num_chsets;

  1992. 

  1993.     return 0;

  1994. }

  1995. 

  1996. /**

  1997.  * Parse extension substream header (HD)

  1998.  */

  1999. static void dca_exss_parse_header(DCAContext *s)

  2000. {

  2001.     int asset_size[8];

  2002.     int ss_index;

  2003.     int blownup;

  2004.     int num_audiop = 1;

  2005.     int num_assets = 1;

  2006.     int active_ss_mask[8];

  2007.     int i, j;

  2008.     int start_posn;

  2009.     int hdrsize;

  2010.     uint32_t mkr;

  2011. 

  2012.     if (get_bits_left(&s->gb) < 52)

  2013.         return;

  2014. 

  2015.     start_posn = get_bits_count(&s->gb) - 32;

  2016. 

  2017.     skip_bits(&s->gb, 8); // user data

  2018.     ss_index = get_bits(&s->gb, 2);

  2019. 

  2020.     blownup = get_bits1(&s->gb);

  2021.     hdrsize = get_bits(&s->gb,  8 + 4 * blownup) + 1; // header_size

  2022.     skip_bits(&s->gb, 16 + 4 * blownup); // hd_size

  2023. 

  2024.     s->static_fields = get_bits1(&s->gb);

  2025.     if (s->static_fields) {

  2026.         skip_bits(&s->gb, 2); // reference clock code

  2027.         skip_bits(&s->gb, 3); // frame duration code

  2028. 

  2029.         if (get_bits1(&s->gb))

  2030.             skip_bits_long(&s->gb, 36); // timestamp

  2031. 

  2032.         /* a single stream can contain multiple audio assets that can be

  2033.          * combined to form multiple audio presentations */

  2034. 

  2035.         num_audiop = get_bits(&s->gb, 3) + 1;

  2036.         if (num_audiop > 1) {

  2037.             avpriv_request_sample(s->avctx,

  2038.                                   "Multiple DTS-HD audio presentations");

  2039.             /* ignore such streams for now */

  2040.             return;

  2041.         }

  2042. 

  2043.         num_assets = get_bits(&s->gb, 3) + 1;

  2044.         if (num_assets > 1) {

  2045.             avpriv_request_sample(s->avctx, "Multiple DTS-HD audio assets");

  2046.             /* ignore such streams for now */

  2047.             return;

  2048.         }

  2049. 

  2050.         for (i = 0; i < num_audiop; i++)

  2051.             active_ss_mask[i] = get_bits(&s->gb, ss_index + 1);

  2052. 

  2053.         for (i = 0; i < num_audiop; i++)

  2054.             for (j = 0; j <= ss_index; j++)

  2055.                 if (active_ss_mask[i] & (1 << j))

  2056.                     skip_bits(&s->gb, 8); // active asset mask

  2057. 

  2058.         s->mix_metadata = get_bits1(&s->gb);

  2059.         if (s->mix_metadata) {

  2060.             int mix_out_mask_size;

  2061. 

  2062.             skip_bits(&s->gb, 2); // adjustment level

  2063.             mix_out_mask_size  = (get_bits(&s->gb, 2) + 1) << 2;

  2064.             s->num_mix_configs =  get_bits(&s->gb, 2) + 1;

  2065. 

  2066.             for (i = 0; i < s->num_mix_configs; i++) {

  2067.                 int mix_out_mask        = get_bits(&s->gb, mix_out_mask_size);

  2068.                 s->mix_config_num_ch[i] = dca_exss_mask2count(mix_out_mask);

  2069.             }

  2070.         }

  2071.     }

  2072. 

  2073.     for (i = 0; i < num_assets; i++)

  2074.         asset_size[i] = get_bits_long(&s->gb, 16 + 4 * blownup);

  2075. 

  2076.     for (i = 0; i < num_assets; i++) {

  2077.         if (dca_exss_parse_asset_header(s))

  2078.             return;

  2079.     }

  2080. 

  2081.     /* not parsed further, we were only interested in the extensions mask

  2082.      * from the asset header */

  2083. 

  2084.     if (num_assets > 0) {

  2085.         j = get_bits_count(&s->gb);

  2086.         if (start_posn + hdrsize * 8 > j)

  2087.             skip_bits_long(&s->gb, start_posn + hdrsize * 8 - j);

  2088. 

  2089.         for (i = 0; i < num_assets; i++) {

  2090.             start_posn = get_bits_count(&s->gb);

  2091.             mkr        = get_bits_long(&s->gb, 32);

  2092. 

  2093.             /* parse extensions that we know about */

  2094.             if (mkr == 0x655e315e) {

  2095.                 dca_xbr_parse_frame(s);

  2096.             } else if (mkr == 0x47004a03) {

  2097.                 dca_xxch_decode_frame(s);

  2098.                 s->core_ext_mask |= DCA_EXT_XXCH; /* xxx use for chan reordering */

  2099.             } else {

  2100.                 av_log(s->avctx, AV_LOG_DEBUG,

  2101.                        "DTS-ExSS: unknown marker = 0x%08x\n", mkr);

  2102.             }

  2103. 

  2104.             /* skip to end of block */

  2105.             j = get_bits_count(&s->gb);

  2106.             if (start_posn + asset_size[i] * 8 > j)

  2107.                 skip_bits_long(&s->gb, start_posn + asset_size[i] * 8 - j);

  2108.         }

  2109.     }

  2110. }

  2111. 

  2112. /**

  2113.  * Main frame decoding function

  2114.  * FIXME add arguments

  2115.  */

  2116. static int dca_decode_frame(AVCodecContext *avctx, void *data,

  2117.                             int *got_frame_ptr, AVPacket *avpkt)

  2118. {

  2119.     AVFrame *frame     = data;

  2120.     const uint8_t *buf = avpkt->data;

  2121.     int buf_size = avpkt->size;

  2122.     int channel_mask;

  2123.     int channel_layout;

  2124.     int lfe_samples;

  2125.     int num_core_channels = 0;

  2126.     int i, ret;

  2127.     float **samples_flt;

  2128.     float *src_chan;

  2129.     float *dst_chan;

  2130.     DCAContext *s = avctx->priv_data;

  2131.     int core_ss_end;

  2132.     int channels, full_channels;

  2133.     float scale;

  2134.     int achan;

  2135.     int chset;

  2136.     int mask;

  2137.     int lavc;

  2138.     int posn;

  2139.     int j, k;

  2140.     int endch;

  2141. 

  2142.     s->xch_present = 0;

  2143. 

  2144.     s->dca_buffer_size = ff_dca_convert_bitstream(buf, buf_size, s->dca_buffer,

  2145.                                                   DCA_MAX_FRAME_SIZE + DCA_MAX_EXSS_HEADER_SIZE);

  2146.     if (s->dca_buffer_size == AVERROR_INVALIDDATA) {

  2147.         av_log(avctx, AV_LOG_ERROR, "Not a valid DCA frame\n");

  2148.         return AVERROR_INVALIDDATA;

  2149.     }

  2150. 

  2151.     init_get_bits(&s->gb, s->dca_buffer, s->dca_buffer_size * 8);

  2152.     if ((ret = dca_parse_frame_header(s)) < 0) {

  2153.         //seems like the frame is corrupt, try with the next one

  2154.         return ret;

  2155.     }

  2156.     //set AVCodec values with parsed data

  2157.     avctx->sample_rate = s->sample_rate;

  2158.     avctx->bit_rate    = s->bit_rate;

  2159. 

  2160.     s->profile = FF_PROFILE_DTS;

  2161. 

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

  2163.         if ((ret = dca_decode_block(s, 0, i))) {

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

  2165.             return ret;

  2166.         }

  2167.     }

  2168. 

  2169.     /* record number of core channels incase less than max channels are requested */

  2170.     num_core_channels = s->prim_channels;

  2171. 

  2172.     if (s->prim_channels + !!s->lfe > 2 &&

  2173.         avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {

  2174.             /* Stereo downmix coefficients

  2175.              *

  2176.              * The decoder can only downmix to 2-channel, so we need to ensure

  2177.              * embedded downmix coefficients are actually targeting 2-channel.

  2178.              */

  2179.             if (s->core_downmix && (s->core_downmix_amode == DCA_STEREO ||

  2180.                                     s->core_downmix_amode == DCA_STEREO_TOTAL)) {

  2181.                 int sign, code;

  2182.                 for (i = 0; i < s->prim_channels + !!s->lfe; i++) {

  2183.                     sign = s->core_downmix_codes[i][0] & 0x100 ? 1 : -1;

  2184.                     code = s->core_downmix_codes[i][0] & 0x0FF;

  2185.                     s->downmix_coef[i][0] = (!code ? 0.0f :

  2186.                                              sign * dca_dmixtable[code - 1]);

  2187.                     sign = s->core_downmix_codes[i][1] & 0x100 ? 1 : -1;

  2188.                     code = s->core_downmix_codes[i][1] & 0x0FF;

  2189.                     s->downmix_coef[i][1] = (!code ? 0.0f :

  2190.                                              sign * dca_dmixtable[code - 1]);

  2191.                 }

  2192.                 s->output = s->core_downmix_amode;

  2193.             } else {

  2194.                 int am = s->amode & DCA_CHANNEL_MASK;

  2195.                 if (am >= FF_ARRAY_ELEMS(dca_default_coeffs)) {

  2196.                     av_log(s->avctx, AV_LOG_ERROR,

  2197.                            "Invalid channel mode %d\n", am);

  2198.                     return AVERROR_INVALIDDATA;

  2199.                 }

  2200.                 if (s->prim_channels + !!s->lfe >

  2201.                     FF_ARRAY_ELEMS(dca_default_coeffs[0])) {

  2202.                     avpriv_request_sample(s->avctx, "Downmixing %d channels",

  2203.                                           s->prim_channels + !!s->lfe);

  2204.                     return AVERROR_PATCHWELCOME;

  2205.                 }

  2206.                 for (i = 0; i < s->prim_channels + !!s->lfe; i++) {

  2207.                     s->downmix_coef[i][0] = dca_default_coeffs[am][i][0];

  2208.                     s->downmix_coef[i][1] = dca_default_coeffs[am][i][1];

  2209.                 }

  2210.             }

  2211.             av_dlog(s->avctx, "Stereo downmix coeffs:\n");

  2212.             for (i = 0; i < s->prim_channels + !!s->lfe; i++) {

  2213.                 av_dlog(s->avctx, "L, input channel %d = %f\n", i,

  2214.                         s->downmix_coef[i][0]);

  2215.                 av_dlog(s->avctx, "R, input channel %d = %f\n", i,

  2216.                         s->downmix_coef[i][1]);

  2217.             }

  2218.             av_dlog(s->avctx, "\n");

  2219.     }

  2220. 

  2221.     if (s->ext_coding)

  2222.         s->core_ext_mask = dca_ext_audio_descr_mask[s->ext_descr];

  2223.     else

  2224.         s->core_ext_mask = 0;

  2225. 

  2226.     core_ss_end = FFMIN(s->frame_size, s->dca_buffer_size) * 8;

  2227. 

  2228.     /* only scan for extensions if ext_descr was unknown or indicated a

  2229.      * supported XCh extension */

  2230.     if (s->core_ext_mask < 0 || s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH)) {

  2231. 

  2232.         /* if ext_descr was unknown, clear s->core_ext_mask so that the

  2233.          * extensions scan can fill it up */

  2234.         s->core_ext_mask = FFMAX(s->core_ext_mask, 0);

  2235. 

  2236.         /* extensions start at 32-bit boundaries into bitstream */

  2237.         skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);

  2238. 

  2239.         while (core_ss_end - get_bits_count(&s->gb) >= 32) {

  2240.             uint32_t bits = get_bits_long(&s->gb, 32);

  2241. 

  2242.             switch (bits) {

  2243.             case 0x5a5a5a5a: {

  2244.                 int ext_amode, xch_fsize;

  2245. 

  2246.                 s->xch_base_channel = s->prim_channels;

  2247. 

  2248.                 /* validate sync word using XCHFSIZE field */

  2249.                 xch_fsize = show_bits(&s->gb, 10);

  2250.                 if ((s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize) &&

  2251.                     (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize + 1))

  2252.                     continue;

  2253. 

  2254.                 /* skip length-to-end-of-frame field for the moment */

  2255.                 skip_bits(&s->gb, 10);

  2256. 

  2257.                 s->core_ext_mask |= DCA_EXT_XCH;

  2258. 

  2259.                 /* extension amode(number of channels in extension) should be 1 */

  2260.                 /* AFAIK XCh is not used for more channels */

  2261.                 if ((ext_amode = get_bits(&s->gb, 4)) != 1) {

  2262.                     av_log(avctx, AV_LOG_ERROR, "XCh extension amode %d not"

  2263.                            " supported!\n", ext_amode);

  2264.                     continue;

  2265.                 }

  2266. 

  2267.                 if (s->xch_base_channel < 2) {

  2268.                     avpriv_request_sample(avctx, "XCh with fewer than 2 base channels");

  2269.                     continue;

  2270.                 }

  2271. 

  2272.                 /* much like core primary audio coding header */

  2273.                 dca_parse_audio_coding_header(s, s->xch_base_channel, 0);

  2274. 

  2275.                 for (i = 0; i < (s->sample_blocks / 8); i++)

  2276.                     if ((ret = dca_decode_block(s, s->xch_base_channel, i))) {

  2277.                         av_log(avctx, AV_LOG_ERROR, "error decoding XCh extension\n");

  2278.                         continue;

  2279.                     }

  2280. 

  2281.                 s->xch_present = 1;

  2282.                 break;

  2283.             }

  2284.             case 0x47004a03:

  2285.                 /* XXCh: extended channels */

  2286.                 /* usually found either in core or HD part in DTS-HD HRA streams,

  2287.                  * but not in DTS-ES which contains XCh extensions instead */

  2288.                 s->core_ext_mask |= DCA_EXT_XXCH;

  2289.                 dca_xxch_decode_frame(s);

  2290.                 break;

  2291. 

  2292.             case 0x1d95f262: {

  2293.                 int fsize96 = show_bits(&s->gb, 12) + 1;

  2294.                 if (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + fsize96)

  2295.                     continue;

  2296. 

  2297.                 av_log(avctx, AV_LOG_DEBUG, "X96 extension found at %d bits\n",

  2298.                        get_bits_count(&s->gb));

  2299.                 skip_bits(&s->gb, 12);

  2300.                 av_log(avctx, AV_LOG_DEBUG, "FSIZE96 = %d bytes\n", fsize96);

  2301.                 av_log(avctx, AV_LOG_DEBUG, "REVNO = %d\n", get_bits(&s->gb, 4));

  2302. 

  2303.                 s->core_ext_mask |= DCA_EXT_X96;

  2304.                 break;

  2305.             }

  2306.             }

  2307. 

  2308.             skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);

  2309.         }

  2310.     } else {

  2311.         /* no supported extensions, skip the rest of the core substream */

  2312.         skip_bits_long(&s->gb, core_ss_end - get_bits_count(&s->gb));

  2313.     }

  2314. 

  2315.     if (s->core_ext_mask & DCA_EXT_X96)

  2316.         s->profile = FF_PROFILE_DTS_96_24;

  2317.     else if (s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH))

  2318.         s->profile = FF_PROFILE_DTS_ES;

  2319. 

  2320.     /* check for ExSS (HD part) */

  2321.     if (s->dca_buffer_size - s->frame_size > 32 &&

  2322.         get_bits_long(&s->gb, 32) == DCA_HD_MARKER)

  2323.         dca_exss_parse_header(s);

  2324. 

  2325.     avctx->profile = s->profile;

  2326. 

  2327.     full_channels = channels = s->prim_channels + !!s->lfe;

  2328. 

  2329.     /* If we have XXCH then the channel layout is managed differently */

  2330.     /* note that XLL will also have another way to do things */

  2331.     if (!(s->core_ext_mask & DCA_EXT_XXCH)

  2332.         || (s->core_ext_mask & DCA_EXT_XXCH && avctx->request_channels > 0

  2333.             && avctx->request_channels

  2334.             < num_core_channels + !!s->lfe + s->xxch_chset_nch[0]))

  2335.     { /* xxx should also do MA extensions */

  2336.         if (s->amode < 16) {

  2337.             avctx->channel_layout = dca_core_channel_layout[s->amode];

  2338. #if FF_API_REQUEST_CHANNELS

  2339. FF_DISABLE_DEPRECATION_WARNINGS

  2340.             if (s->xch_present && !s->xch_disable &&

  2341.                 (!avctx->request_channels ||

  2342.                  avctx->request_channels > num_core_channels + !!s->lfe)) {

  2343. FF_ENABLE_DEPRECATION_WARNINGS

  2344. #else

  2345.             if (s->xch_present && !s->xch_disable) {

  2346. #endif

  2347.                 avctx->channel_layout |= AV_CH_BACK_CENTER;

  2348.                 if (s->lfe) {

  2349.                     avctx->channel_layout |= AV_CH_LOW_FREQUENCY;

  2350.                     s->channel_order_tab = dca_channel_reorder_lfe_xch[s->amode];

  2351.                 } else {

  2352.                     s->channel_order_tab = dca_channel_reorder_nolfe_xch[s->amode];

  2353.                 }

  2354.                 if (s->channel_order_tab[s->xch_base_channel] < 0)

  2355.                     return AVERROR_INVALIDDATA;

  2356.             } else {

  2357.                 channels = num_core_channels + !!s->lfe;

  2358.                 s->xch_present = 0; /* disable further xch processing */

  2359.                 if (s->lfe) {

  2360.                     avctx->channel_layout |= AV_CH_LOW_FREQUENCY;

  2361.                     s->channel_order_tab = dca_channel_reorder_lfe[s->amode];

  2362.                 } else

  2363.                     s->channel_order_tab = dca_channel_reorder_nolfe[s->amode];

  2364.             }

  2365. 

  2366.             if (channels > !!s->lfe &&

  2367.                 s->channel_order_tab[channels - 1 - !!s->lfe] < 0)

  2368.                 return AVERROR_INVALIDDATA;

  2369. 

  2370.             if (av_get_channel_layout_nb_channels(avctx->channel_layout) != channels) {

  2371.                 av_log(avctx, AV_LOG_ERROR, "Number of channels %d mismatches layout %d\n", channels, av_get_channel_layout_nb_channels(avctx->channel_layout));

  2372.                 return AVERROR_INVALIDDATA;

  2373.             }

  2374. 

  2375.             if (s->prim_channels + !!s->lfe > 2 &&

  2376.                 avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {

  2377.                 channels = 2;

  2378.                 s->output = s->prim_channels == 2 ? s->amode : DCA_STEREO;

  2379.                 avctx->channel_layout = AV_CH_LAYOUT_STEREO;

  2380.             }

  2381.             else if (avctx->request_channel_layout & AV_CH_LAYOUT_NATIVE) {

  2382.                 static const int8_t dca_channel_order_native[9] = { 0, 1, 2, 3, 4, 5, 6, 7, 8 };

  2383.                 s->channel_order_tab = dca_channel_order_native;

  2384.             }

  2385.             s->lfe_index = dca_lfe_index[s->amode];

  2386.         } else {

  2387.             av_log(avctx, AV_LOG_ERROR,

  2388.                    "Non standard configuration %d !\n", s->amode);

  2389.             return AVERROR_INVALIDDATA;

  2390.         }

  2391. 

  2392.         s->xxch_dmix_embedded = 0;

  2393.     } else {

  2394.         /* we only get here if an XXCH channel set can be added to the mix */

  2395.         channel_mask = s->xxch_core_spkmask;

  2396. 

  2397.         if (avctx->request_channels > 0

  2398.             && avctx->request_channels < s->prim_channels) {

  2399.             channels = num_core_channels + !!s->lfe;

  2400.             for (i = 0; i < s->xxch_chset && channels + s->xxch_chset_nch[i]

  2401.                                               <= avctx->request_channels; i++) {

  2402.                 channels += s->xxch_chset_nch[i];

  2403.                 channel_mask |= s->xxch_spk_masks[i];

  2404.             }

  2405.         } else {

  2406.             channels = s->prim_channels + !!s->lfe;

  2407.             for (i = 0; i < s->xxch_chset; i++) {

  2408.                 channel_mask |= s->xxch_spk_masks[i];

  2409.             }

  2410.         }

  2411. 

  2412.         /* Given the DTS spec'ed channel mask, generate an avcodec version */

  2413.         channel_layout = 0;

  2414.         for (i = 0; i < s->xxch_nbits_spk_mask; ++i) {

  2415.             if (channel_mask & (1 << i)) {

  2416.                 channel_layout |= map_xxch_to_native[i];

  2417.             }

  2418.         }

  2419. 

  2420.         /* make sure that we have managed to get equivelant dts/avcodec channel

  2421.          * masks in some sense -- unfortunately some channels could overlap */

  2422.         if (av_popcount(channel_mask) != av_popcount(channel_layout)) {

  2423.             av_log(avctx, AV_LOG_DEBUG,

  2424.                    "DTS-XXCH: Inconsistant avcodec/dts channel layouts\n");

  2425.             return AVERROR_INVALIDDATA;

  2426.         }

  2427. 

  2428.         avctx->channel_layout = channel_layout;

  2429. 

  2430.         if (!(avctx->request_channel_layout & AV_CH_LAYOUT_NATIVE)) {

  2431.             /* Estimate DTS --> avcodec ordering table */

  2432.             for (chset = -1, j = 0; chset < s->xxch_chset; ++chset) {

  2433.                 mask = chset >= 0 ? s->xxch_spk_masks[chset]

  2434.                                   : s->xxch_core_spkmask;

  2435.                 for (i = 0; i < s->xxch_nbits_spk_mask; i++) {

  2436.                     if (mask & ~(DCA_XXCH_LFE1 | DCA_XXCH_LFE2) & (1 << i)) {

  2437.                         lavc = map_xxch_to_native[i];

  2438.                         posn = av_popcount(channel_layout & (lavc - 1));

  2439.                         s->xxch_order_tab[j++] = posn;

  2440.                     }

  2441.                 }

  2442.             }

  2443. 

  2444.             s->lfe_index = av_popcount(channel_layout & (AV_CH_LOW_FREQUENCY-1));

  2445.         } else { /* native ordering */

  2446.             for (i = 0; i < channels; i++)

  2447.                 s->xxch_order_tab[i] = i;

  2448. 

  2449.             s->lfe_index = channels - 1;

  2450.         }

  2451. 

  2452.         s->channel_order_tab = s->xxch_order_tab;

  2453.     }

  2454. 

  2455.     if (avctx->channels != channels) {

  2456.         if (avctx->channels)

  2457.             av_log(avctx, AV_LOG_INFO, "Number of channels changed in DCA decoder (%d -> %d)\n", avctx->channels, channels);

  2458.         avctx->channels = channels;

  2459.     }

  2460. 

  2461.     /* get output buffer */

  2462.     frame->nb_samples = 256 * (s->sample_blocks / 8);

  2463.     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)

  2464.         return ret;

  2465.     samples_flt = (float **)frame->extended_data;

  2466. 

  2467.     /* allocate buffer for extra channels if downmixing */

  2468.     if (avctx->channels < full_channels) {

  2469.         ret = av_samples_get_buffer_size(NULL, full_channels - channels,

  2470.                                          frame->nb_samples,

  2471.                                          avctx->sample_fmt, 0);

  2472.         if (ret < 0)

  2473.             return ret;

  2474. 

  2475.         av_fast_malloc(&s->extra_channels_buffer,

  2476.                        &s->extra_channels_buffer_size, ret);

  2477.         if (!s->extra_channels_buffer)

  2478.             return AVERROR(ENOMEM);

  2479. 

  2480.         ret = av_samples_fill_arrays((uint8_t **)s->extra_channels, NULL,

  2481.                                      s->extra_channels_buffer,

  2482.                                      full_channels - channels,

  2483.                                      frame->nb_samples, avctx->sample_fmt, 0);

  2484.         if (ret < 0)

  2485.             return ret;

  2486.     }

  2487. 

  2488.     /* filter to get final output */

  2489.     for (i = 0; i < (s->sample_blocks / 8); i++) {

  2490.         int ch;

  2491. 

  2492.         for (ch = 0; ch < channels; ch++)

  2493.             s->samples_chanptr[ch] = samples_flt[ch] + i * 256;

  2494.         for (; ch < full_channels; ch++)

  2495.             s->samples_chanptr[ch] = s->extra_channels[ch - channels] + i * 256;

  2496. 

  2497.         dca_filter_channels(s, i);

  2498. 

  2499.         /* If this was marked as a DTS-ES stream we need to subtract back- */

  2500.         /* channel from SL & SR to remove matrixed back-channel signal */

  2501.         if ((s->source_pcm_res & 1) && s->xch_present) {

  2502.             float *back_chan = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel]];

  2503.             float *lt_chan   = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel - 2]];

  2504.             float *rt_chan   = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel - 1]];

  2505.             s->fdsp.vector_fmac_scalar(lt_chan, back_chan, -M_SQRT1_2, 256);

  2506.             s->fdsp.vector_fmac_scalar(rt_chan, back_chan, -M_SQRT1_2, 256);

  2507.         }

  2508. 

  2509.         /* If stream contains XXCH, we might need to undo an embedded downmix */

  2510.         if (s->xxch_dmix_embedded) {

  2511.             /* Loop over channel sets in turn */

  2512.             ch = num_core_channels;

  2513.             for (chset = 0; chset < s->xxch_chset; chset++) {

  2514.                 endch = ch + s->xxch_chset_nch[chset];

  2515.                 mask = s->xxch_dmix_embedded;

  2516. 

  2517.                 /* undo downmix */

  2518.                 for (j = ch; j < endch; j++) {

  2519.                     if (mask & (1 << j)) { /* this channel has been mixed-out */

  2520.                         src_chan = s->samples_chanptr[s->channel_order_tab[j]];

  2521.                         for (k = 0; k < endch; k++) {

  2522.                             achan = s->channel_order_tab[k];

  2523.                             scale = s->xxch_dmix_coeff[j][k];

  2524.                             if (scale != 0.0) {

  2525.                                 dst_chan = s->samples_chanptr[achan];

  2526.                                 s->fdsp.vector_fmac_scalar(dst_chan, src_chan,

  2527.                                                            -scale, 256);

  2528.                             }

  2529.                         }

  2530.                     }

  2531.                 }

  2532. 

  2533.                 /* if a downmix has been embedded then undo the pre-scaling */

  2534.                 if ((mask & (1 << ch)) && s->xxch_dmix_sf[chset] != 1.0f) {

  2535.                     scale = s->xxch_dmix_sf[chset];

  2536. 

  2537.                     for (j = 0; j < ch; j++) {

  2538.                         src_chan = s->samples_chanptr[s->channel_order_tab[j]];

  2539.                         for (k = 0; k < 256; k++)

  2540.                             src_chan[k] *= scale;

  2541.                     }

  2542. 

  2543.                     /* LFE channel is always part of core, scale if it exists */

  2544.                     if (s->lfe) {

  2545.                         src_chan = s->samples_chanptr[s->lfe_index];

  2546.                         for (k = 0; k < 256; k++)

  2547.                             src_chan[k] *= scale;

  2548.                     }

  2549.                 }

  2550. 

  2551.                 ch = endch;

  2552.             }

  2553. 

  2554.         }

  2555.     }

  2556. 

  2557.     /* update lfe history */

  2558.     lfe_samples = 2 * s->lfe * (s->sample_blocks / 8);

  2559.     for (i = 0; i < 2 * s->lfe * 4; i++)

  2560.         s->lfe_data[i] = s->lfe_data[i + lfe_samples];

  2561. 

  2562.     /* AVMatrixEncoding

  2563.      *

  2564.      * DCA_STEREO_TOTAL (Lt/Rt) is equivalent to Dolby Surround */

  2565.     ret = ff_side_data_update_matrix_encoding(frame,

  2566.                                               (s->output & ~DCA_LFE) == DCA_STEREO_TOTAL ?

  2567.                                               AV_MATRIX_ENCODING_DOLBY : AV_MATRIX_ENCODING_NONE);

  2568.     if (ret < 0)

  2569.         return ret;

  2570. 

  2571.     *got_frame_ptr = 1;

  2572. 

  2573.     return buf_size;

  2574. }

  2575. 

  2576. 

  2577. 

  2578. /**

  2579.  * DCA initialization

  2580.  *

  2581.  * @param avctx     pointer to the AVCodecContext

  2582.  */

  2583. 

  2584. static av_cold int dca_decode_init(AVCodecContext *avctx)

  2585. {

  2586.     DCAContext *s = avctx->priv_data;

  2587. 

  2588.     s->avctx = avctx;

  2589.     dca_init_vlcs();

  2590. 

  2591.     avpriv_float_dsp_init(&s->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);

  2592.     ff_mdct_init(&s->imdct, 6, 1, 1.0);

  2593.     ff_synth_filter_init(&s->synth);

  2594.     ff_dcadsp_init(&s->dcadsp);

  2595.     ff_fmt_convert_init(&s->fmt_conv, avctx);

  2596. 

  2597.     avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;

  2598. 

  2599.     /* allow downmixing to stereo */

  2600. #if FF_API_REQUEST_CHANNELS

  2601. FF_DISABLE_DEPRECATION_WARNINGS

  2602.     if (avctx->request_channels == 2)

  2603.         avctx->request_channel_layout = AV_CH_LAYOUT_STEREO;

  2604. FF_ENABLE_DEPRECATION_WARNINGS

  2605. #endif

  2606.     if (avctx->channels > 2 &&

  2607.         avctx->request_channel_layout == AV_CH_LAYOUT_STEREO)

  2608.         avctx->channels = 2;

  2609. 

  2610.     return 0;

  2611. }

  2612. 

  2613. static av_cold int dca_decode_end(AVCodecContext *avctx)

  2614. {

  2615.     DCAContext *s = avctx->priv_data;

  2616.     ff_mdct_end(&s->imdct);

  2617.     av_freep(&s->extra_channels_buffer);

  2618.     return 0;

  2619. }

  2620. 

  2621. static const AVProfile profiles[] = {

  2622.     { FF_PROFILE_DTS,        "DTS"        },

  2623.     { FF_PROFILE_DTS_ES,     "DTS-ES"     },

  2624.     { FF_PROFILE_DTS_96_24,  "DTS 96/24"  },

  2625.     { FF_PROFILE_DTS_HD_HRA, "DTS-HD HRA" },

  2626.     { FF_PROFILE_DTS_HD_MA,  "DTS-HD MA"  },

  2627.     { FF_PROFILE_UNKNOWN },

  2628. };

  2629. 

  2630. static const AVOption options[] = {

  2631.     { "disable_xch", "disable decoding of the XCh extension", offsetof(DCAContext, xch_disable), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM|AV_OPT_FLAG_AUDIO_PARAM },

  2632.     { NULL },

  2633. };

  2634. 

  2635. static const AVClass dca_decoder_class = {

  2636.     .class_name = "DCA decoder",

  2637.     .item_name  = av_default_item_name,

  2638.     .option     = options,

  2639.     .version    = LIBAVUTIL_VERSION_INT,

  2640.     .category   = AV_CLASS_CATEGORY_DECODER,

  2641. };

  2642. 

  2643. AVCodec ff_dca_decoder = {

  2644.     .name            = "dca",

  2645.     .long_name       = NULL_IF_CONFIG_SMALL("DCA (DTS Coherent Acoustics)"),

  2646.     .type            = AVMEDIA_TYPE_AUDIO,

  2647.     .id              = AV_CODEC_ID_DTS,

  2648.     .priv_data_size  = sizeof(DCAContext),

  2649.     .init            = dca_decode_init,

  2650.     .decode          = dca_decode_frame,

  2651.     .close           = dca_decode_end,

  2652.     .capabilities    = CODEC_CAP_CHANNEL_CONF | CODEC_CAP_DR1,

  2653.     .sample_fmts     = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,

  2654.                                                        AV_SAMPLE_FMT_NONE },

  2655.     .profiles        = NULL_IF_CONFIG_SMALL(profiles),

  2656.     .priv_class      = &dca_decoder_class,

  2657. };