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FFmpeg/libavcodec/dcadec.c

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  1. /*

  2.  * DCA compatible decoder

  3.  * Copyright (C) 2004 Gildas Bazin

  4.  * Copyright (C) 2004 Benjamin Zores

  5.  * Copyright (C) 2006 Benjamin Larsson

  6.  * Copyright (C) 2007 Konstantin Shishkov

  7.  *

  8.  * This file is part of FFmpeg.

  9.  *

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

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

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

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

  14.  *

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

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

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

  18.  * Lesser General Public License for more details.

  19.  *

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

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

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

  23.  */

  24. 

  25. #include <math.h>

  26. #include <stddef.h>

  27. #include <stdio.h>

  28. 

  29. #include "libavutil/channel_layout.h"

  30. #include "libavutil/common.h"

  31. #include "libavutil/float_dsp.h"

  32. #include "libavutil/internal.h"

  33. #include "libavutil/intreadwrite.h"

  34. #include "libavutil/mathematics.h"

  35. #include "libavutil/opt.h"

  36. #include "libavutil/samplefmt.h"

  37. #include "avcodec.h"

  38. #include "fft.h"

  39. #include "get_bits.h"

  40. #include "dcadata.h"

  41. #include "dcahuff.h"

  42. #include "dca.h"

  43. #include "mathops.h"

  44. #include "synth_filter.h"

  45. #include "dcadsp.h"

  46. #include "fmtconvert.h"

  47. #include "internal.h"

  48. 

  49. #if ARCH_ARM

  50. #   include "arm/dca.h"

  51. #endif

  52. 

  53. //#define TRACE

  54. 

  55. #define DCA_PRIM_CHANNELS_MAX  (7)

  56. #define DCA_SUBBANDS          (64)

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

  58. #define DCA_SUBSUBFRAMES_MAX   (4)

  59. #define DCA_SUBFRAMES_MAX     (16)

  60. #define DCA_BLOCKS_MAX        (16)

  61. #define DCA_LFE_MAX            (3)

  62. #define DCA_CHSETS_MAX         (4)

  63. #define DCA_CHSET_CHANS_MAX    (8)

  64. 

  65. enum DCAMode {

  66.     DCA_MONO = 0,

  67.     DCA_CHANNEL,

  68.     DCA_STEREO,

  69.     DCA_STEREO_SUMDIFF,

  70.     DCA_STEREO_TOTAL,

  71.     DCA_3F,

  72.     DCA_2F1R,

  73.     DCA_3F1R,

  74.     DCA_2F2R,

  75.     DCA_3F2R,

  76.     DCA_4F2R

  77. };

  78. 

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

  80. enum DCAExSSSpeakerMask {

  81.     DCA_EXSS_FRONT_CENTER          = 0x0001,

  82.     DCA_EXSS_FRONT_LEFT_RIGHT      = 0x0002,

  83.     DCA_EXSS_SIDE_REAR_LEFT_RIGHT  = 0x0004,

  84.     DCA_EXSS_LFE                   = 0x0008,

  85.     DCA_EXSS_REAR_CENTER           = 0x0010,

  86.     DCA_EXSS_FRONT_HIGH_LEFT_RIGHT = 0x0020,

  87.     DCA_EXSS_REAR_LEFT_RIGHT       = 0x0040,

  88.     DCA_EXSS_FRONT_HIGH_CENTER     = 0x0080,

  89.     DCA_EXSS_OVERHEAD              = 0x0100,

  90.     DCA_EXSS_CENTER_LEFT_RIGHT     = 0x0200,

  91.     DCA_EXSS_WIDE_LEFT_RIGHT       = 0x0400,

  92.     DCA_EXSS_SIDE_LEFT_RIGHT       = 0x0800,

  93.     DCA_EXSS_LFE2                  = 0x1000,

  94.     DCA_EXSS_SIDE_HIGH_LEFT_RIGHT  = 0x2000,

  95.     DCA_EXSS_REAR_HIGH_CENTER      = 0x4000,

  96.     DCA_EXSS_REAR_HIGH_LEFT_RIGHT  = 0x8000,

  97. };

  98. 

  99. enum DCAXxchSpeakerMask {

  100.     DCA_XXCH_FRONT_CENTER          = 0x0000001,

  101.     DCA_XXCH_FRONT_LEFT            = 0x0000002,

  102.     DCA_XXCH_FRONT_RIGHT           = 0x0000004,

  103.     DCA_XXCH_SIDE_REAR_LEFT        = 0x0000008,

  104.     DCA_XXCH_SIDE_REAR_RIGHT       = 0x0000010,

  105.     DCA_XXCH_LFE1                  = 0x0000020,

  106.     DCA_XXCH_REAR_CENTER           = 0x0000040,

  107.     DCA_XXCH_SURROUND_REAR_LEFT    = 0x0000080,

  108.     DCA_XXCH_SURROUND_REAR_RIGHT   = 0x0000100,

  109.     DCA_XXCH_SIDE_SURROUND_LEFT    = 0x0000200,

  110.     DCA_XXCH_SIDE_SURROUND_RIGHT   = 0x0000400,

  111.     DCA_XXCH_FRONT_CENTER_LEFT     = 0x0000800,

  112.     DCA_XXCH_FRONT_CENTER_RIGHT    = 0x0001000,

  113.     DCA_XXCH_FRONT_HIGH_LEFT       = 0x0002000,

  114.     DCA_XXCH_FRONT_HIGH_CENTER     = 0x0004000,

  115.     DCA_XXCH_FRONT_HIGH_RIGHT      = 0x0008000,

  116.     DCA_XXCH_LFE2                  = 0x0010000,

  117.     DCA_XXCH_SIDE_FRONT_LEFT       = 0x0020000,

  118.     DCA_XXCH_SIDE_FRONT_RIGHT      = 0x0040000,

  119.     DCA_XXCH_OVERHEAD              = 0x0080000,

  120.     DCA_XXCH_SIDE_HIGH_LEFT        = 0x0100000,

  121.     DCA_XXCH_SIDE_HIGH_RIGHT       = 0x0200000,

  122.     DCA_XXCH_REAR_HIGH_CENTER      = 0x0400000,

  123.     DCA_XXCH_REAR_HIGH_LEFT        = 0x0800000,

  124.     DCA_XXCH_REAR_HIGH_RIGHT       = 0x1000000,

  125.     DCA_XXCH_REAR_LOW_CENTER       = 0x2000000,

  126.     DCA_XXCH_REAR_LOW_LEFT         = 0x4000000,

  127.     DCA_XXCH_REAR_LOW_RIGHT        = 0x8000000,

  128. };

  129. 

  130. static const uint32_t map_xxch_to_native[28] = {

  131.     AV_CH_FRONT_CENTER,

  132.     AV_CH_FRONT_LEFT,

  133.     AV_CH_FRONT_RIGHT,

  134.     AV_CH_SIDE_LEFT,

  135.     AV_CH_SIDE_RIGHT,

  136.     AV_CH_LOW_FREQUENCY,

  137.     AV_CH_BACK_CENTER,

  138.     AV_CH_BACK_LEFT,

  139.     AV_CH_BACK_RIGHT,

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

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

  142.     AV_CH_FRONT_LEFT_OF_CENTER,

  143.     AV_CH_FRONT_RIGHT_OF_CENTER,

  144.     AV_CH_TOP_FRONT_LEFT,

  145.     AV_CH_TOP_FRONT_CENTER,

  146.     AV_CH_TOP_FRONT_RIGHT,

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

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

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

  150.     AV_CH_TOP_CENTER,           /* overhead */

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

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

  153.     AV_CH_TOP_BACK_CENTER,

  154.     AV_CH_TOP_BACK_LEFT,

  155.     AV_CH_TOP_BACK_RIGHT,

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

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

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

  159. };

  160. 

  161. enum DCAExtensionMask {

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

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

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

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

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

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

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

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

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

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

  172. };

  173. 

  174. /* -1 are reserved or unknown */

  175. static const int dca_ext_audio_descr_mask[] = {

  176.     DCA_EXT_XCH,

  177.     -1,

  178.     DCA_EXT_X96,

  179.     DCA_EXT_XCH | DCA_EXT_X96,

  180.     -1,

  181.     -1,

  182.     DCA_EXT_XXCH,

  183.     -1,

  184. };

  185. 

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

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

  188. 

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

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

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

  192.  *

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

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

  195.  * OV -> center back

  196.  * All 2 channel configurations -> AV_CH_LAYOUT_STEREO

  197.  */

  198. static const uint64_t dca_core_channel_layout[] = {

  199.     AV_CH_FRONT_CENTER,                                                     ///< 1, A

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

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

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

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

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

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

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

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

  208. 

  209.     AV_CH_LAYOUT_STEREO | AV_CH_FRONT_CENTER | AV_CH_SIDE_LEFT |

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

  211. 

  212.     AV_CH_LAYOUT_STEREO | AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT |

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

  214. 

  215.     AV_CH_LAYOUT_STEREO | AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT |

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

  217. 

  218.     AV_CH_FRONT_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER |

  219.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_BACK_CENTER   |

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

  221. 

  222.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_CENTER   |

  223.     AV_CH_FRONT_RIGHT_OF_CENTER | AV_CH_LAYOUT_STEREO |

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

  225. 

  226.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER |

  227.     AV_CH_LAYOUT_STEREO | AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT |

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

  229. 

  230.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_CENTER   |

  231.     AV_CH_FRONT_RIGHT_OF_CENTER | AV_CH_LAYOUT_STEREO |

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

  233. };

  234. 

  235. static const int8_t dca_lfe_index[] = {

  236.     1, 2, 2, 2, 2, 3, 2, 3, 2, 3, 2, 3, 1, 3, 2, 3

  237. };

  238. 

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

  240.     { 0, -1, -1, -1, -1, -1, -1, -1, -1},

  241.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  242.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  243.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  244.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  245.     { 2,  0,  1, -1, -1, -1, -1, -1, -1},

  246.     { 0,  1,  3, -1, -1, -1, -1, -1, -1},

  247.     { 2,  0,  1,  4, -1, -1, -1, -1, -1},

  248.     { 0,  1,  3,  4, -1, -1, -1, -1, -1},

  249.     { 2,  0,  1,  4,  5, -1, -1, -1, -1},

  250.     { 3,  4,  0,  1,  5,  6, -1, -1, -1},

  251.     { 2,  0,  1,  4,  5,  6, -1, -1, -1},

  252.     { 0,  6,  4,  5,  2,  3, -1, -1, -1},

  253.     { 4,  2,  5,  0,  1,  6,  7, -1, -1},

  254.     { 5,  6,  0,  1,  7,  3,  8,  4, -1},

  255.     { 4,  2,  5,  0,  1,  6,  8,  7, -1},

  256. };

  257. 

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

  259.     { 0,  2, -1, -1, -1, -1, -1, -1, -1},

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

  261.     { 0,  1,  3, -1, -1, -1, -1, -1, -1},

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

  263.     { 0,  1,  3, -1, -1, -1, -1, -1, -1},

  264.     { 2,  0,  1,  4, -1, -1, -1, -1, -1},

  265.     { 0,  1,  3,  4, -1, -1, -1, -1, -1},

  266.     { 2,  0,  1,  4,  5, -1, -1, -1, -1},

  267.     { 0,  1,  4,  5,  3, -1, -1, -1, -1},

  268.     { 2,  0,  1,  5,  6,  4, -1, -1, -1},

  269.     { 3,  4,  0,  1,  6,  7,  5, -1, -1},

  270.     { 2,  0,  1,  4,  5,  6,  7, -1, -1},

  271.     { 0,  6,  4,  5,  2,  3,  7, -1, -1},

  272.     { 4,  2,  5,  0,  1,  7,  8,  6, -1},

  273.     { 5,  6,  0,  1,  8,  3,  9,  4,  7},

  274.     { 4,  2,  5,  0,  1,  6,  9,  8,  7},

  275. };

  276. 

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

  278.     { 0, -1, -1, -1, -1, -1, -1, -1, -1},

  279.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  280.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  281.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  282.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  283.     { 2,  0,  1, -1, -1, -1, -1, -1, -1},

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

  285.     { 2,  0,  1,  3, -1, -1, -1, -1, -1},

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

  287.     { 2,  0,  1,  3,  4, -1, -1, -1, -1},

  288.     { 2,  3,  0,  1,  4,  5, -1, -1, -1},

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

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

  291.     { 3,  2,  4,  0,  1,  5,  6, -1, -1},

  292.     { 4,  5,  0,  1,  6,  2,  7,  3, -1},

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

  294. };

  295. 

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

  297.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

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

  299.     { 0,  1,  2, -1, -1, -1, -1, -1, -1},

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

  301.     { 0,  1,  2, -1, -1, -1, -1, -1, -1},

  302.     { 2,  0,  1,  3, -1, -1, -1, -1, -1},

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

  304.     { 2,  0,  1,  3,  4, -1, -1, -1, -1},

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

  306.     { 2,  0,  1,  4,  5,  3, -1, -1, -1},

  307.     { 2,  3,  0,  1,  5,  6,  4, -1, -1},

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

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

  310.     { 3,  2,  4,  0,  1,  6,  7,  5, -1},

  311.     { 4,  5,  0,  1,  7,  2,  8,  3,  6},

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

  313. };

  314. 

  315. #define DCA_DOLBY                  101           /* FIXME */

  316. 

  317. #define DCA_CHANNEL_BITS             6

  318. #define DCA_CHANNEL_MASK          0x3F

  319. 

  320. #define DCA_LFE                   0x80

  321. 

  322. #define HEADER_SIZE                 14

  323. 

  324. #define DCA_MAX_FRAME_SIZE       16384

  325. #define DCA_MAX_EXSS_HEADER_SIZE  4096

  326. 

  327. #define DCA_BUFFER_PADDING_SIZE   1024

  328. 

  329. /** Bit allocation */

  330. typedef struct {

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

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

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

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

  335. } BitAlloc;

  336. 

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

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

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

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

  341. 

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

  343.                                          int idx)

  344. {

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

  346.            ba->offset;

  347. }

  348. 

  349. typedef struct {

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

  351.     AVCodecContext *avctx;

  352.     /* Frame header */

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

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

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

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

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

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

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

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

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

  362. 

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

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

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

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

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

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

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

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

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

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

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

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

  375.     int copy_history;           ///< copy history

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

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

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

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

  380. 

  381.     /* Primary audio coding header */

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

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

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

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

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

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

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

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

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

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

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

  393. 

  394.     /* Primary audio coding side information */

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

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

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

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

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

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

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

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

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

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

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

  406. 

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

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

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

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

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

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

  413. 

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

  415. 

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

  417.     int lfe_scale_factor;

  418. 

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

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

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

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

  423.     int hist_index[DCA_PRIM_CHANNELS_MAX];

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

  425. 

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

  427. 

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

  429.     float *samples_chanptr[DCA_PRIM_CHANNELS_MAX + 1];

  430.     float *extra_channels[DCA_PRIM_CHANNELS_MAX + 1];

  431.     uint8_t *extra_channels_buffer;

  432.     unsigned int extra_channels_buffer_size;

  433. 

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

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

  436. 

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

  438.     GetBitContext gb;

  439.     /* Current position in DCA frame */

  440.     int current_subframe;

  441.     int current_subsubframe;

  442. 

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

  444. 

  445.     /* XCh extension information */

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

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

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

  449. 

  450.     /* XXCH extension information */

  451.     int xxch_chset;

  452.     int xxch_nbits_spk_mask;

  453.     uint32_t xxch_core_spkmask;

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

  455.     int xxch_chset_nch[4];

  456.     float xxch_dmix_sf[DCA_CHSETS_MAX];

  457. 

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

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

  460. 

  461.     int8_t xxch_order_tab[32];

  462.     int8_t lfe_index;

  463. 

  464.     /* ExSS header parser */

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

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

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

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

  469. 

  470.     int profile;

  471. 

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

  473.     AVFloatDSPContext fdsp;

  474.     FFTContext imdct;

  475.     SynthFilterContext synth;

  476.     DCADSPContext dcadsp;

  477.     FmtConvertContext fmt_conv;

  478. } DCAContext;

  479. 

  480. static const uint16_t dca_vlc_offs[] = {

  481.         0,   512,   640,   768,  1282,  1794,  2436,  3080,  3770,  4454,  5364,

  482.      5372,  5380,  5388,  5392,  5396,  5412,  5420,  5428,  5460,  5492,  5508,

  483.      5572,  5604,  5668,  5796,  5860,  5892,  6412,  6668,  6796,  7308,  7564,

  484.      7820,  8076,  8620,  9132,  9388,  9910, 10166, 10680, 11196, 11726, 12240,

  485.     12752, 13298, 13810, 14326, 14840, 15500, 16022, 16540, 17158, 17678, 18264,

  486.     18796, 19352, 19926, 20468, 21472, 22398, 23014, 23622,

  487. };

  488. 

  489. static av_cold void dca_init_vlcs(void)

  490. {

  491.     static int vlcs_initialized = 0;

  492.     int i, j, c = 14;

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

  494. 

  495.     if (vlcs_initialized)

  496.         return;

  497. 

  498.     dca_bitalloc_index.offset = 1;

  499.     dca_bitalloc_index.wrap = 2;

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

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

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

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

  504.                  bitalloc_12_bits[i], 1, 1,

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

  506.     }

  507.     dca_scalefactor.offset = -64;

  508.     dca_scalefactor.wrap = 2;

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

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

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

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

  513.                  scales_bits[i], 1, 1,

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

  515.     }

  516.     dca_tmode.offset = 0;

  517.     dca_tmode.wrap = 1;

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

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

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

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

  522.                  tmode_bits[i], 1, 1,

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

  524.     }

  525. 

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

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

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

  529.                 break;

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

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

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

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

  534. 

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

  536.                      bitalloc_sizes[i],

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

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

  539.             c++;

  540.         }

  541.     vlcs_initialized = 1;

  542. }

  543. 

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

  545. {

  546.     while (len--)

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

  548. }

  549. 

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

  551. {

  552.     int i, base, mask;

  553. 

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

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

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

  557.         base += av_popcount(mask);

  558. 

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

  560. }

  561. 

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

  563.                                          int xxch)

  564. {

  565.     int i, j;

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

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

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

  569.     int hdr_pos = 0, hdr_size = 0;

  570.     float sign, mag, scale_factor;

  571.     int this_chans, acc_mask;

  572.     int embedded_downmix;

  573.     int nchans, mask[8];

  574.     int coeff, ichan;

  575. 

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

  577.     if (xxch) {

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

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

  580.     }

  581. 

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

  583.     s->total_channels = nchans + base_channel;

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

  585. 

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

  587.     if (xxch) {

  588.         acc_mask = s->xxch_core_spkmask;

  589. 

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

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

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

  593. 

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

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

  596. 

  597.         /* check for downmixing information */

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

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

  600.             scale_factor     =

  601.                1.0f / dca_dmixtable[(get_bits(&s->gb, 6) - 1) << 2];

  602. 

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

  604. 

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

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

  607.             }

  608. 

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

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

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

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

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

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

  615.                             av_log(s->avctx, AV_LOG_WARNING,

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

  617.                             continue;

  618.                         }

  619. 

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

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

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

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

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

  625.                     }

  626.                 }

  627.             }

  628.         }

  629.     }

  630. 

  631.     if (s->prim_channels > DCA_PRIM_CHANNELS_MAX)

  632.         s->prim_channels = DCA_PRIM_CHANNELS_MAX;

  633. 

  634. 

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

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

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

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

  639.     }

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

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

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

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

  644.     }

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

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

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

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

  649. 

  650.     /* Get codebooks quantization indexes */

  651.     if (!base_channel)

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

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

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

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

  656. 

  657.     /* Get scale factor adjustment */

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

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

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

  661. 

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

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

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

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

  666. 

  667.     if (!xxch) {

  668.         if (s->crc_present) {

  669.             /* Audio header CRC check */

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

  671.         }

  672.     } else {

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

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

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

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

  677.     }

  678. 

  679.     s->current_subframe    = 0;

  680.     s->current_subsubframe = 0;

  681. 

  682. #ifdef TRACE

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

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

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

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

  687.                s->subband_activity[i]);

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

  689.                s->vq_start_subband[i]);

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

  691.                s->joint_intensity[i]);

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

  693.                s->transient_huffman[i]);

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

  695.                s->scalefactor_huffman[i]);

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

  697.                s->bitalloc_huffman[i]);

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

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

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

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

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

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

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

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

  706.     }

  707. #endif

  708. 

  709.     return 0;

  710. }

  711. 

  712. static int dca_parse_frame_header(DCAContext *s)

  713. {

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

  715. 

  716.     /* Sync code */

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

  718. 

  719.     /* Frame header */

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

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

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

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

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

  725.     if (s->frame_size < 95)

  726.         return AVERROR_INVALIDDATA;

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

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

  729.     if (!s->sample_rate)

  730.         return AVERROR_INVALIDDATA;

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

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

  733.     if (!s->bit_rate)

  734.         return AVERROR_INVALIDDATA;

  735. 

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

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

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

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

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

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

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

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

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

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

  746. 

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

  748.         s->lfe = 0;

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

  750.         return AVERROR_INVALIDDATA;

  751.     }

  752. 

  753.     /* TODO: check CRC */

  754.     if (s->crc_present)

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

  756. 

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

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

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

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

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

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

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

  764. 

  765.     /* FIXME: channels mixing levels */

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

  767.     if (s->lfe)

  768.         s->output |= DCA_LFE;

  769. 

  770. #ifdef TRACE

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

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

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

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

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

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

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

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

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

  780.            s->sample_rate);

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

  782.            s->bit_rate);

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

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

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

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

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

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

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

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

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

  792.            s->predictor_history);

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

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

  795.            s->multirate_inter);

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

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

  798.     av_log(s->avctx, AV_LOG_DEBUG,

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

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

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

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

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

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

  805. #endif

  806. 

  807.     /* Primary audio coding header */

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

  809. 

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

  811. }

  812. 

  813. 

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

  815. {

  816.     if (level < 5) {

  817.         /* huffman encoded */

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

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

  820.     } else if (level < 8) {

  821.         if (level + 1 > log2range) {

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

  823.             value = get_bits(gb, log2range);

  824.         } else {

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

  826.         }

  827.     }

  828.     return value;

  829. }

  830. 

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

  832. {

  833.     /* Primary audio coding side information */

  834.     int j, k;

  835. 

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

  837.         return AVERROR_INVALIDDATA;

  838. 

  839.     if (!base_channel) {

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

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

  842.     }

  843. 

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

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

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

  847.     }

  848. 

  849.     /* Get prediction codebook */

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

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

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

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

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

  855.             }

  856.         }

  857.     }

  858. 

  859.     /* Bit allocation index */

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

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

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

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

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

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

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

  867.                 av_log(s->avctx, AV_LOG_ERROR,

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

  869.                 return AVERROR_INVALIDDATA;

  870.             } else {

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

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

  873.             }

  874. 

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

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

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

  878.                 return AVERROR_INVALIDDATA;

  879.             }

  880.         }

  881.     }

  882. 

  883.     /* Transition mode */

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

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

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

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

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

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

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

  891.             }

  892.         }

  893.     }

  894. 

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

  896.         return AVERROR_INVALIDDATA;

  897. 

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

  899.         const uint32_t *scale_table;

  900.         int scale_sum, log_size;

  901. 

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

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

  904. 

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

  906.             scale_table = scale_factor_quant7;

  907.             log_size = 7;

  908.         } else {

  909.             scale_table = scale_factor_quant6;

  910.             log_size = 6;

  911.         }

  912. 

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

  914.         scale_sum = 0;

  915. 

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

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

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

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

  920.             }

  921. 

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

  923.                 /* Get second scale factor */

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

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

  926.             }

  927.         }

  928.     }

  929. 

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

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

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

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

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

  935.     }

  936. 

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

  938.         return AVERROR_INVALIDDATA;

  939. 

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

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

  942.         int source_channel;

  943. 

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

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

  946.             int scale = 0;

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

  948. 

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

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

  951. 

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

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

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

  955.             }

  956. 

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

  958.                 av_log(s->avctx, AV_LOG_DEBUG,

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

  960.                 s->debug_flag |= 0x02;

  961.             }

  962.         }

  963.     }

  964. 

  965.     /* Dynamic range coefficient */

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

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

  968. 

  969.     /* Side information CRC check word */

  970.     if (s->crc_present) {

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

  972.     }

  973. 

  974.     /*

  975.      * Primary audio data arrays

  976.      */

  977. 

  978.     /* VQ encoded high frequency subbands */

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

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

  981.             /* 1 vector -> 32 samples */

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

  983. 

  984.     /* Low frequency effect data */

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

  986.         int quant7;

  987.         /* LFE samples */

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

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

  990.         float lfe_scale;

  991. 

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

  993.             /* Signed 8 bits int */

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

  995.         }

  996. 

  997.         /* Scale factor index */

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

  999.         if (quant7 > 127) {

  1000.             avpriv_request_sample(s->avctx, "LFEScaleIndex larger than 127");

  1001.             return AVERROR_INVALIDDATA;

  1002.         }

  1003.         s->lfe_scale_factor = scale_factor_quant7[quant7];

  1004. 

  1005.         /* Quantization step size * scale factor */

  1006.         lfe_scale = 0.035 * s->lfe_scale_factor;

  1007. 

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

  1009.             s->lfe_data[j] *= lfe_scale;

  1010.     }

  1011. 

  1012. #ifdef TRACE

  1013.     av_log(s->avctx, AV_LOG_DEBUG, "subsubframes: %i\n",

  1014.            s->subsubframes[s->current_subframe]);

  1015.     av_log(s->avctx, AV_LOG_DEBUG, "partial samples: %i\n",

  1016.            s->partial_samples[s->current_subframe]);

  1017. 

  1018.     for (j = base_channel; j < s->prim_channels; j++) {

  1019.         av_log(s->avctx, AV_LOG_DEBUG, "prediction mode:");

  1020.         for (k = 0; k < s->subband_activity[j]; k++)

  1021.             av_log(s->avctx, AV_LOG_DEBUG, " %i", s->prediction_mode[j][k]);

  1022.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1023.     }

  1024.     for (j = base_channel; j < s->prim_channels; j++) {

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

  1026.             av_log(s->avctx, AV_LOG_DEBUG,

  1027.                    "prediction coefs: %f, %f, %f, %f\n",

  1028.                    (float) adpcm_vb[s->prediction_vq[j][k]][0] / 8192,

  1029.                    (float) adpcm_vb[s->prediction_vq[j][k]][1] / 8192,

  1030.                    (float) adpcm_vb[s->prediction_vq[j][k]][2] / 8192,

  1031.                    (float) adpcm_vb[s->prediction_vq[j][k]][3] / 8192);

  1032.     }

  1033.     for (j = base_channel; j < s->prim_channels; j++) {

  1034.         av_log(s->avctx, AV_LOG_DEBUG, "bitalloc index: ");

  1035.         for (k = 0; k < s->vq_start_subband[j]; k++)

  1036.             av_log(s->avctx, AV_LOG_DEBUG, "%2.2i ", s->bitalloc[j][k]);

  1037.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1038.     }

  1039.     for (j = base_channel; j < s->prim_channels; j++) {

  1040.         av_log(s->avctx, AV_LOG_DEBUG, "Transition mode:");

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

  1042.             av_log(s->avctx, AV_LOG_DEBUG, " %i", s->transition_mode[j][k]);

  1043.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1044.     }

  1045.     for (j = base_channel; j < s->prim_channels; j++) {

  1046.         av_log(s->avctx, AV_LOG_DEBUG, "Scale factor:");

  1047.         for (k = 0; k < s->subband_activity[j]; k++) {

  1048.             if (k >= s->vq_start_subband[j] || s->bitalloc[j][k] > 0)

  1049.                 av_log(s->avctx, AV_LOG_DEBUG, " %i", s->scale_factor[j][k][0]);

  1050.             if (k < s->vq_start_subband[j] && s->transition_mode[j][k])

  1051.                 av_log(s->avctx, AV_LOG_DEBUG, " %i(t)", s->scale_factor[j][k][1]);

  1052.         }

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

  1054.     }

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

  1056.         if (s->joint_intensity[j] > 0) {

  1057.             int source_channel = s->joint_intensity[j] - 1;

  1058.             av_log(s->avctx, AV_LOG_DEBUG, "Joint scale factor index:\n");

  1059.             for (k = s->subband_activity[j]; k < s->subband_activity[source_channel]; k++)

  1060.                 av_log(s->avctx, AV_LOG_DEBUG, " %i", s->joint_scale_factor[j][k]);

  1061.             av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1062.         }

  1063.     }

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

  1065.         for (k = s->vq_start_subband[j]; k < s->subband_activity[j]; k++)

  1066.             av_log(s->avctx, AV_LOG_DEBUG, "VQ index: %i\n", s->high_freq_vq[j][k]);

  1067.     if (!base_channel && s->lfe) {

  1068.         int lfe_samples = 2 * s->lfe * (4 + block_index);

  1069.         int lfe_end_sample = 2 * s->lfe * (4 + block_index + s->subsubframes[s->current_subframe]);

  1070. 

  1071.         av_log(s->avctx, AV_LOG_DEBUG, "LFE samples:\n");

  1072.         for (j = lfe_samples; j < lfe_end_sample; j++)

  1073.             av_log(s->avctx, AV_LOG_DEBUG, " %f", s->lfe_data[j]);

  1074.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1075.     }

  1076. #endif

  1077. 

  1078.     return 0;

  1079. }

  1080. 

  1081. static void qmf_32_subbands(DCAContext *s, int chans,

  1082.                             float samples_in[32][8], float *samples_out,

  1083.                             float scale)

  1084. {

  1085.     const float *prCoeff;

  1086. 

  1087.     int sb_act = s->subband_activity[chans];

  1088. 

  1089.     scale *= sqrt(1 / 8.0);

  1090. 

  1091.     /* Select filter */

  1092.     if (!s->multirate_inter)    /* Non-perfect reconstruction */

  1093.         prCoeff = fir_32bands_nonperfect;

  1094.     else                        /* Perfect reconstruction */

  1095.         prCoeff = fir_32bands_perfect;

  1096. 

  1097.     s->dcadsp.qmf_32_subbands(samples_in, sb_act, &s->synth, &s->imdct,

  1098.                               s->subband_fir_hist[chans],

  1099.                               &s->hist_index[chans],

  1100.                               s->subband_fir_noidea[chans], prCoeff,

  1101.                               samples_out, s->raXin, scale);

  1102. }

  1103. 

  1104. static void lfe_interpolation_fir(DCAContext *s, int decimation_select,

  1105.                                   int num_deci_sample, float *samples_in,

  1106.                                   float *samples_out, float scale)

  1107. {

  1108.     /* samples_in: An array holding decimated samples.

  1109.      *   Samples in current subframe starts from samples_in[0],

  1110.      *   while samples_in[-1], samples_in[-2], ..., stores samples

  1111.      *   from last subframe as history.

  1112.      *

  1113.      * samples_out: An array holding interpolated samples

  1114.      */

  1115. 

  1116.     int decifactor;

  1117.     const float *prCoeff;

  1118.     int deciindex;

  1119. 

  1120.     /* Select decimation filter */

  1121.     if (decimation_select == 1) {

  1122.         decifactor = 64;

  1123.         prCoeff = lfe_fir_128;

  1124.     } else {

  1125.         decifactor = 32;

  1126.         prCoeff = lfe_fir_64;

  1127.     }

  1128.     /* Interpolation */

  1129.     for (deciindex = 0; deciindex < num_deci_sample; deciindex++) {

  1130.         s->dcadsp.lfe_fir(samples_out, samples_in, prCoeff, decifactor, scale);

  1131.         samples_in++;

  1132.         samples_out += 2 * decifactor;

  1133.     }

  1134. }

  1135. 

  1136. /* downmixing routines */

  1137. #define MIX_REAR1(samples, s1, rs, coef)            \

  1138.     samples[0][i] += samples[s1][i] * coef[rs][0];  \

  1139.     samples[1][i] += samples[s1][i] * coef[rs][1];

  1140. 

  1141. #define MIX_REAR2(samples, s1, s2, rs, coef)                                          \

  1142.     samples[0][i] += samples[s1][i] * coef[rs][0] + samples[s2][i] * coef[rs + 1][0]; \

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

  1144. 

  1145. #define MIX_FRONT3(samples, coef)                                      \

  1146.     t = samples[c][i];                                                 \

  1147.     u = samples[l][i];                                                 \

  1148.     v = samples[r][i];                                                 \

  1149.     samples[0][i] = t * coef[0][0] + u * coef[1][0] + v * coef[2][0];  \

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

  1151. 

  1152. #define DOWNMIX_TO_STEREO(op1, op2)             \

  1153.     for (i = 0; i < 256; i++) {                 \

  1154.         op1                                     \

  1155.         op2                                     \

  1156.     }

  1157. 

  1158. static void dca_downmix(float **samples, int srcfmt, int lfe_present,

  1159.                         float coef[DCA_PRIM_CHANNELS_MAX + 1][2],

  1160.                         const int8_t *channel_mapping)

  1161. {

  1162.     int c, l, r, sl, sr, s;

  1163.     int i;

  1164.     float t, u, v;

  1165. 

  1166.     switch (srcfmt) {

  1167.     case DCA_MONO:

  1168.     case DCA_4F2R:

  1169.         av_log(NULL, AV_LOG_ERROR, "Not implemented!\n");

  1170.         break;

  1171.     case DCA_CHANNEL:

  1172.     case DCA_STEREO:

  1173.     case DCA_STEREO_TOTAL:

  1174.     case DCA_STEREO_SUMDIFF:

  1175.         break;

  1176.     case DCA_3F:

  1177.         c = channel_mapping[0];

  1178.         l = channel_mapping[1];

  1179.         r = channel_mapping[2];

  1180.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef), );

  1181.         break;

  1182.     case DCA_2F1R:

  1183.         s = channel_mapping[2];

  1184.         DOWNMIX_TO_STEREO(MIX_REAR1(samples, s, 2, coef), );

  1185.         break;

  1186.     case DCA_3F1R:

  1187.         c = channel_mapping[0];

  1188.         l = channel_mapping[1];

  1189.         r = channel_mapping[2];

  1190.         s = channel_mapping[3];

  1191.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),

  1192.                           MIX_REAR1(samples, s, 3, coef));

  1193.         break;

  1194.     case DCA_2F2R:

  1195.         sl = channel_mapping[2];

  1196.         sr = channel_mapping[3];

  1197.         DOWNMIX_TO_STEREO(MIX_REAR2(samples, sl, sr, 2, coef), );

  1198.         break;

  1199.     case DCA_3F2R:

  1200.         c  = channel_mapping[0];

  1201.         l  = channel_mapping[1];

  1202.         r  = channel_mapping[2];

  1203.         sl = channel_mapping[3];

  1204.         sr = channel_mapping[4];

  1205.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),

  1206.                           MIX_REAR2(samples, sl, sr, 3, coef));

  1207.         break;

  1208.     }

  1209.     if (lfe_present) {

  1210.         int lf_buf = dca_lfe_index[srcfmt];

  1211.         int lf_idx = dca_channels [srcfmt];

  1212.         for (i = 0; i < 256; i++) {

  1213.             samples[0][i] += samples[lf_buf][i] * coef[lf_idx][0];

  1214.             samples[1][i] += samples[lf_buf][i] * coef[lf_idx][1];

  1215.         }

  1216.     }

  1217. }

  1218. 

  1219. 

  1220. #ifndef decode_blockcodes

  1221. /* Very compact version of the block code decoder that does not use table

  1222.  * look-up but is slightly slower */

  1223. static int decode_blockcode(int code, int levels, int32_t *values)

  1224. {

  1225.     int i;

  1226.     int offset = (levels - 1) >> 1;

  1227. 

  1228.     for (i = 0; i < 4; i++) {

  1229.         int div = FASTDIV(code, levels);

  1230.         values[i] = code - offset - div * levels;

  1231.         code = div;

  1232.     }

  1233. 

  1234.     return code;

  1235. }

  1236. 

  1237. static int decode_blockcodes(int code1, int code2, int levels, int32_t *values)

  1238. {

  1239.     return decode_blockcode(code1, levels, values) |

  1240.            decode_blockcode(code2, levels, values + 4);

  1241. }

  1242. #endif

  1243. 

  1244. static const uint8_t abits_sizes[7]  = { 7, 10, 12, 13, 15, 17, 19 };

  1245. static const uint8_t abits_levels[7] = { 3,  5,  7,  9, 13, 17, 25 };

  1246. 

  1247. #ifndef int8x8_fmul_int32

  1248. static inline void int8x8_fmul_int32(float *dst, const int8_t *src, int scale)

  1249. {

  1250.     float fscale = scale / 16.0;

  1251.     int i;

  1252.     for (i = 0; i < 8; i++)

  1253.         dst[i] = src[i] * fscale;

  1254. }

  1255. #endif

  1256. 

  1257. static int dca_subsubframe(DCAContext *s, int base_channel, int block_index)

  1258. {

  1259.     int k, l;

  1260.     int subsubframe = s->current_subsubframe;

  1261. 

  1262.     const float *quant_step_table;

  1263. 

  1264.     /* FIXME */

  1265.     float (*subband_samples)[DCA_SUBBANDS][8] = s->subband_samples[block_index];

  1266.     LOCAL_ALIGNED_16(int32_t, block, [8 * DCA_SUBBANDS]);

  1267. 

  1268.     /*

  1269.      * Audio data

  1270.      */

  1271. 

  1272.     /* Select quantization step size table */

  1273.     if (s->bit_rate_index == 0x1f)

  1274.         quant_step_table = lossless_quant_d;

  1275.     else

  1276.         quant_step_table = lossy_quant_d;

  1277. 

  1278.     for (k = base_channel; k < s->prim_channels; k++) {

  1279.         float rscale[DCA_SUBBANDS];

  1280. 

  1281.         if (get_bits_left(&s->gb) < 0)

  1282.             return AVERROR_INVALIDDATA;

  1283. 

  1284.         for (l = 0; l < s->vq_start_subband[k]; l++) {

  1285.             int m;

  1286. 

  1287.             /* Select the mid-tread linear quantizer */

  1288.             int abits = s->bitalloc[k][l];

  1289. 

  1290.             float quant_step_size = quant_step_table[abits];

  1291. 

  1292.             /*

  1293.              * Determine quantization index code book and its type

  1294.              */

  1295. 

  1296.             /* Select quantization index code book */

  1297.             int sel = s->quant_index_huffman[k][abits];

  1298. 

  1299.             /*

  1300.              * Extract bits from the bit stream

  1301.              */

  1302.             if (!abits) {

  1303.                 rscale[l] = 0;

  1304.                 memset(block + 8 * l, 0, 8 * sizeof(block[0]));

  1305.             } else {

  1306.                 /* Deal with transients */

  1307.                 int sfi = s->transition_mode[k][l] && subsubframe >= s->transition_mode[k][l];

  1308.                 rscale[l] = quant_step_size * s->scale_factor[k][l][sfi] *

  1309.                                s->scalefactor_adj[k][sel];

  1310. 

  1311.                 if (abits >= 11 || !dca_smpl_bitalloc[abits].vlc[sel].table) {

  1312.                     if (abits <= 7) {

  1313.                         /* Block code */

  1314.                         int block_code1, block_code2, size, levels, err;

  1315. 

  1316.                         size   = abits_sizes[abits - 1];

  1317.                         levels = abits_levels[abits - 1];

  1318. 

  1319.                         block_code1 = get_bits(&s->gb, size);

  1320.                         block_code2 = get_bits(&s->gb, size);

  1321.                         err = decode_blockcodes(block_code1, block_code2,

  1322.                                                 levels, block + 8 * l);

  1323.                         if (err) {

  1324.                             av_log(s->avctx, AV_LOG_ERROR,

  1325.                                    "ERROR: block code look-up failed\n");

  1326.                             return AVERROR_INVALIDDATA;

  1327.                         }

  1328.                     } else {

  1329.                         /* no coding */

  1330.                         for (m = 0; m < 8; m++)

  1331.                             block[8 * l + m] = get_sbits(&s->gb, abits - 3);

  1332.                     }

  1333.                 } else {

  1334.                     /* Huffman coded */

  1335.                     for (m = 0; m < 8; m++)

  1336.                         block[8 * l + m] = get_bitalloc(&s->gb,

  1337.                                                 &dca_smpl_bitalloc[abits], sel);

  1338.                 }

  1339. 

  1340.             }

  1341.         }

  1342. 

  1343.         s->fmt_conv.int32_to_float_fmul_array8(&s->fmt_conv, subband_samples[k][0],

  1344.                                                block, rscale, 8 * s->vq_start_subband[k]);

  1345. 

  1346.         for (l = 0; l < s->vq_start_subband[k]; l++) {

  1347.             int m;

  1348.             /*

  1349.              * Inverse ADPCM if in prediction mode

  1350.              */

  1351.             if (s->prediction_mode[k][l]) {

  1352.                 int n;

  1353.                 for (m = 0; m < 8; m++) {

  1354.                     for (n = 1; n <= 4; n++)

  1355.                         if (m >= n)

  1356.                             subband_samples[k][l][m] +=

  1357.                                 (adpcm_vb[s->prediction_vq[k][l]][n - 1] *

  1358.                                  subband_samples[k][l][m - n] / 8192);

  1359.                         else if (s->predictor_history)

  1360.                             subband_samples[k][l][m] +=

  1361.                                 (adpcm_vb[s->prediction_vq[k][l]][n - 1] *

  1362.                                  s->subband_samples_hist[k][l][m - n + 4] / 8192);

  1363.                 }

  1364.             }

  1365.         }

  1366. 

  1367.         /*

  1368.          * Decode VQ encoded high frequencies

  1369.          */

  1370.         for (l = s->vq_start_subband[k]; l < s->subband_activity[k]; l++) {

  1371.             /* 1 vector -> 32 samples but we only need the 8 samples

  1372.              * for this subsubframe. */

  1373.             int hfvq = s->high_freq_vq[k][l];

  1374. 

  1375.             if (!s->debug_flag & 0x01) {

  1376.                 av_log(s->avctx, AV_LOG_DEBUG,

  1377.                        "Stream with high frequencies VQ coding\n");

  1378.                 s->debug_flag |= 0x01;

  1379.             }

  1380. 

  1381.             int8x8_fmul_int32(subband_samples[k][l],

  1382.                               &high_freq_vq[hfvq][subsubframe * 8],

  1383.                               s->scale_factor[k][l][0]);

  1384.         }

  1385.     }

  1386. 

  1387.     /* Check for DSYNC after subsubframe */

  1388.     if (s->aspf || subsubframe == s->subsubframes[s->current_subframe] - 1) {

  1389.         if (0xFFFF == get_bits(&s->gb, 16)) {   /* 0xFFFF */

  1390. #ifdef TRACE

  1391.             av_log(s->avctx, AV_LOG_DEBUG, "Got subframe DSYNC\n");

  1392. #endif

  1393.         } else {

  1394.             av_log(s->avctx, AV_LOG_ERROR, "Didn't get subframe DSYNC\n");

  1395.             return AVERROR_INVALIDDATA;

  1396.         }

  1397.     }

  1398. 

  1399.     /* Backup predictor history for adpcm */

  1400.     for (k = base_channel; k < s->prim_channels; k++)

  1401.         for (l = 0; l < s->vq_start_subband[k]; l++)

  1402.             memcpy(s->subband_samples_hist[k][l],

  1403.                    &subband_samples[k][l][4],

  1404.                    4 * sizeof(subband_samples[0][0][0]));

  1405. 

  1406.     return 0;

  1407. }

  1408. 

  1409. static int dca_filter_channels(DCAContext *s, int block_index)

  1410. {

  1411.     float (*subband_samples)[DCA_SUBBANDS][8] = s->subband_samples[block_index];

  1412.     int k;

  1413. 

  1414.     /* 32 subbands QMF */

  1415.     for (k = 0; k < s->prim_channels; k++) {

  1416. /*        static float pcm_to_double[8] = { 32768.0, 32768.0, 524288.0, 524288.0,

  1417.                                             0, 8388608.0, 8388608.0 };*/

  1418.         if (s->channel_order_tab[k] >= 0)

  1419.             qmf_32_subbands(s, k, subband_samples[k],

  1420.                             s->samples_chanptr[s->channel_order_tab[k]],

  1421.                             M_SQRT1_2 / 32768.0 /* pcm_to_double[s->source_pcm_res] */);

  1422.     }

  1423. 

  1424.     /* Generate LFE samples for this subsubframe FIXME!!! */

  1425.     if (s->lfe) {

  1426.         lfe_interpolation_fir(s, s->lfe, 2 * s->lfe,

  1427.                               s->lfe_data + 2 * s->lfe * (block_index + 4),

  1428.                               s->samples_chanptr[s->lfe_index],

  1429.                               1.0 / (256.0 * 32768.0));

  1430.         /* Outputs 20bits pcm samples */

  1431.     }

  1432. 

  1433.     /* Downmixing to Stereo */

  1434.     if (s->prim_channels + !!s->lfe > 2 &&

  1435.         s->avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {

  1436.         dca_downmix(s->samples_chanptr, s->amode, !!s->lfe, s->downmix_coef,

  1437.                     s->channel_order_tab);

  1438.     }

  1439. 

  1440.     return 0;

  1441. }

  1442. 

  1443. 

  1444. static int dca_subframe_footer(DCAContext *s, int base_channel)

  1445. {

  1446.     int in, out, aux_data_count, aux_data_end, reserved;

  1447. 

  1448.     /*

  1449.      * Unpack optional information

  1450.      */

  1451. 

  1452.     /* presumably optional information only appears in the core? */

  1453.     if (!base_channel) {

  1454.         if (s->timestamp)

  1455.             skip_bits_long(&s->gb, 32);

  1456. 

  1457.         if (s->aux_data) {

  1458.             aux_data_count = get_bits(&s->gb, 6);

  1459. 

  1460.             // align (32-bit)

  1461.             skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);

  1462. 

  1463.             aux_data_end = 8 * aux_data_count + get_bits_count(&s->gb);

  1464. 

  1465.             if (get_bits_long(&s->gb, 32) != 0x9A1105A0) { // nSYNCAUX

  1466.                 av_log(s->avctx,AV_LOG_ERROR, "nSYNCAUX mismatching\n");

  1467.                 return AVERROR_INVALIDDATA;

  1468.             }

  1469. 

  1470.             if (get_bits1(&s->gb)) { // bAUXTimeStampFlag

  1471.                 avpriv_request_sample(s->avctx,

  1472.                                       "Auxiliary Decode Time Stamp Flag");

  1473.                 // align (4-bit)

  1474.                 skip_bits(&s->gb, (-get_bits_count(&s->gb)) & 4);

  1475.                 // 44 bits: nMSByte (8), nMarker (4), nLSByte (28), nMarker (4)

  1476.                 skip_bits_long(&s->gb, 44);

  1477.             }

  1478. 

  1479.             if ((s->core_downmix = get_bits1(&s->gb))) {

  1480.                 switch (get_bits(&s->gb, 3)) {

  1481.                 case 0:

  1482.                     s->core_downmix_amode = DCA_MONO;

  1483.                     break;

  1484.                 case 1:

  1485.                     s->core_downmix_amode = DCA_STEREO;

  1486.                     break;

  1487.                 case 2:

  1488.                     s->core_downmix_amode = DCA_STEREO_TOTAL;

  1489.                     break;

  1490.                 case 3:

  1491.                     s->core_downmix_amode = DCA_3F;

  1492.                     break;

  1493.                 case 4:

  1494.                     s->core_downmix_amode = DCA_2F1R;

  1495.                     break;

  1496.                 case 5:

  1497.                     s->core_downmix_amode = DCA_2F2R;

  1498.                     break;

  1499.                 case 6:

  1500.                     s->core_downmix_amode = DCA_3F1R;

  1501.                     break;

  1502.                 default:

  1503.                     return AVERROR_INVALIDDATA;

  1504.                 }

  1505.                 for (out = 0; out < dca_channels[s->core_downmix_amode]; out++) {

  1506.                     for (in = 0; in < s->prim_channels + !!s->lfe; in++) {

  1507.                         uint16_t tmp = get_bits(&s->gb, 9);

  1508.                         if ((tmp & 0xFF) > 241)

  1509.                             return AVERROR_INVALIDDATA;

  1510.                         s->core_downmix_codes[in][out] = tmp;

  1511.                     }

  1512.                 }

  1513.             }

  1514. 

  1515.             align_get_bits(&s->gb); // byte align

  1516.             skip_bits(&s->gb, 16);  // nAUXCRC16

  1517. 

  1518.             // additional data (reserved, cf. ETSI TS 102 114 V1.4.1)

  1519.             if ((reserved = (aux_data_end - get_bits_count(&s->gb))) < 0) {

  1520.                  av_log(s->avctx, AV_LOG_ERROR, "overread aux by %d bits\n", -reserved);

  1521.                 return AVERROR_INVALIDDATA;

  1522.             } else if (reserved) {

  1523.                 avpriv_request_sample(s->avctx,

  1524.                                       "Core auxiliary data reserved content");

  1525.                 skip_bits_long(&s->gb, reserved);

  1526.             }

  1527.         }

  1528. 

  1529.         if (s->crc_present && s->dynrange)

  1530.             get_bits(&s->gb, 16);

  1531.     }

  1532. 

  1533.     return 0;

  1534. }

  1535. 

  1536. /**

  1537.  * Decode a dca frame block

  1538.  *

  1539.  * @param s     pointer to the DCAContext

  1540.  */

  1541. 

  1542. static int dca_decode_block(DCAContext *s, int base_channel, int block_index)

  1543. {

  1544.     int ret;

  1545. 

  1546.     /* Sanity check */

  1547.     if (s->current_subframe >= s->subframes) {

  1548.         av_log(s->avctx, AV_LOG_DEBUG, "check failed: %i>%i",

  1549.                s->current_subframe, s->subframes);

  1550.         return AVERROR_INVALIDDATA;

  1551.     }

  1552. 

  1553.     if (!s->current_subsubframe) {

  1554. #ifdef TRACE

  1555.         av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subframe_header\n");

  1556. #endif

  1557.         /* Read subframe header */

  1558.         if ((ret = dca_subframe_header(s, base_channel, block_index)))

  1559.             return ret;

  1560.     }

  1561. 

  1562.     /* Read subsubframe */

  1563. #ifdef TRACE

  1564.     av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subsubframe\n");

  1565. #endif

  1566.     if ((ret = dca_subsubframe(s, base_channel, block_index)))

  1567.         return ret;

  1568. 

  1569.     /* Update state */

  1570.     s->current_subsubframe++;

  1571.     if (s->current_subsubframe >= s->subsubframes[s->current_subframe]) {

  1572.         s->current_subsubframe = 0;

  1573.         s->current_subframe++;

  1574.     }

  1575.     if (s->current_subframe >= s->subframes) {

  1576. #ifdef TRACE

  1577.         av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subframe_footer\n");

  1578. #endif

  1579.         /* Read subframe footer */

  1580.         if ((ret = dca_subframe_footer(s, base_channel)))

  1581.             return ret;

  1582.     }

  1583. 

  1584.     return 0;

  1585. }

  1586. 

  1587. /**

  1588.  * Return the number of channels in an ExSS speaker mask (HD)

  1589.  */

  1590. static int dca_exss_mask2count(int mask)

  1591. {

  1592.     /* count bits that mean speaker pairs twice */

  1593.     return av_popcount(mask) +

  1594.            av_popcount(mask & (DCA_EXSS_CENTER_LEFT_RIGHT      |

  1595.                                DCA_EXSS_FRONT_LEFT_RIGHT       |

  1596.                                DCA_EXSS_FRONT_HIGH_LEFT_RIGHT  |

  1597.                                DCA_EXSS_WIDE_LEFT_RIGHT        |

  1598.                                DCA_EXSS_SIDE_LEFT_RIGHT        |

  1599.                                DCA_EXSS_SIDE_HIGH_LEFT_RIGHT   |

  1600.                                DCA_EXSS_SIDE_REAR_LEFT_RIGHT   |

  1601.                                DCA_EXSS_REAR_LEFT_RIGHT        |

  1602.                                DCA_EXSS_REAR_HIGH_LEFT_RIGHT));

  1603. }

  1604. 

  1605. /**

  1606.  * Skip mixing coefficients of a single mix out configuration (HD)

  1607.  */

  1608. static void dca_exss_skip_mix_coeffs(GetBitContext *gb, int channels, int out_ch)

  1609. {

  1610.     int i;

  1611. 

  1612.     for (i = 0; i < channels; i++) {

  1613.         int mix_map_mask = get_bits(gb, out_ch);

  1614.         int num_coeffs = av_popcount(mix_map_mask);

  1615.         skip_bits_long(gb, num_coeffs * 6);

  1616.     }

  1617. }

  1618. 

  1619. /**

  1620.  * Parse extension substream asset header (HD)

  1621.  */

  1622. static int dca_exss_parse_asset_header(DCAContext *s)

  1623. {

  1624.     int header_pos = get_bits_count(&s->gb);

  1625.     int header_size;

  1626.     int channels = 0;

  1627.     int embedded_stereo = 0;

  1628.     int embedded_6ch    = 0;

  1629.     int drc_code_present;

  1630.     int av_uninit(extensions_mask);

  1631.     int i, j;

  1632. 

  1633.     if (get_bits_left(&s->gb) < 16)

  1634.         return -1;

  1635. 

  1636.     /* We will parse just enough to get to the extensions bitmask with which

  1637.      * we can set the profile value. */

  1638. 

  1639.     header_size = get_bits(&s->gb, 9) + 1;

  1640.     skip_bits(&s->gb, 3); // asset index

  1641. 

  1642.     if (s->static_fields) {

  1643.         if (get_bits1(&s->gb))

  1644.             skip_bits(&s->gb, 4); // asset type descriptor

  1645.         if (get_bits1(&s->gb))

  1646.             skip_bits_long(&s->gb, 24); // language descriptor

  1647. 

  1648.         if (get_bits1(&s->gb)) {

  1649.             /* How can one fit 1024 bytes of text here if the maximum value

  1650.              * for the asset header size field above was 512 bytes? */

  1651.             int text_length = get_bits(&s->gb, 10) + 1;

  1652.             if (get_bits_left(&s->gb) < text_length * 8)

  1653.                 return -1;

  1654.             skip_bits_long(&s->gb, text_length * 8); // info text

  1655.         }

  1656. 

  1657.         skip_bits(&s->gb, 5); // bit resolution - 1

  1658.         skip_bits(&s->gb, 4); // max sample rate code

  1659.         channels = get_bits(&s->gb, 8) + 1;

  1660. 

  1661.         if (get_bits1(&s->gb)) { // 1-to-1 channels to speakers

  1662.             int spkr_remap_sets;

  1663.             int spkr_mask_size = 16;

  1664.             int num_spkrs[7];

  1665. 

  1666.             if (channels > 2)

  1667.                 embedded_stereo = get_bits1(&s->gb);

  1668.             if (channels > 6)

  1669.                 embedded_6ch = get_bits1(&s->gb);

  1670. 

  1671.             if (get_bits1(&s->gb)) {

  1672.                 spkr_mask_size = (get_bits(&s->gb, 2) + 1) << 2;

  1673.                 skip_bits(&s->gb, spkr_mask_size); // spkr activity mask

  1674.             }

  1675. 

  1676.             spkr_remap_sets = get_bits(&s->gb, 3);

  1677. 

  1678.             for (i = 0; i < spkr_remap_sets; i++) {

  1679.                 /* std layout mask for each remap set */

  1680.                 num_spkrs[i] = dca_exss_mask2count(get_bits(&s->gb, spkr_mask_size));

  1681.             }

  1682. 

  1683.             for (i = 0; i < spkr_remap_sets; i++) {

  1684.                 int num_dec_ch_remaps = get_bits(&s->gb, 5) + 1;

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

  1686.                     return -1;

  1687. 

  1688.                 for (j = 0; j < num_spkrs[i]; j++) {

  1689.                     int remap_dec_ch_mask = get_bits_long(&s->gb, num_dec_ch_remaps);

  1690.                     int num_dec_ch = av_popcount(remap_dec_ch_mask);

  1691.                     skip_bits_long(&s->gb, num_dec_ch * 5); // remap codes

  1692.                 }

  1693.             }

  1694. 

  1695.         } else {

  1696.             skip_bits(&s->gb, 3); // representation type

  1697.         }

  1698.     }

  1699. 

  1700.     drc_code_present = get_bits1(&s->gb);

  1701.     if (drc_code_present)

  1702.         get_bits(&s->gb, 8); // drc code

  1703. 

  1704.     if (get_bits1(&s->gb))

  1705.         skip_bits(&s->gb, 5); // dialog normalization code

  1706. 

  1707.     if (drc_code_present && embedded_stereo)

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

  1709. 

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

  1711.         skip_bits(&s->gb, 1); // external mix

  1712.         skip_bits(&s->gb, 6); // post mix gain code

  1713. 

  1714.         if (get_bits(&s->gb, 2) != 3) // mixer drc code

  1715.             skip_bits(&s->gb, 3); // drc limit

  1716.         else

  1717.             skip_bits(&s->gb, 8); // custom drc code

  1718. 

  1719.         if (get_bits1(&s->gb)) // channel specific scaling

  1720.             for (i = 0; i < s->num_mix_configs; i++)

  1721.                 skip_bits_long(&s->gb, s->mix_config_num_ch[i] * 6); // scale codes

  1722.         else

  1723.             skip_bits_long(&s->gb, s->num_mix_configs * 6); // scale codes

  1724. 

  1725.         for (i = 0; i < s->num_mix_configs; i++) {

  1726.             if (get_bits_left(&s->gb) < 0)

  1727.                 return -1;

  1728.             dca_exss_skip_mix_coeffs(&s->gb, channels, s->mix_config_num_ch[i]);

  1729.             if (embedded_6ch)

  1730.                 dca_exss_skip_mix_coeffs(&s->gb, 6, s->mix_config_num_ch[i]);

  1731.             if (embedded_stereo)

  1732.                 dca_exss_skip_mix_coeffs(&s->gb, 2, s->mix_config_num_ch[i]);

  1733.         }

  1734.     }

  1735. 

  1736.     switch (get_bits(&s->gb, 2)) {

  1737.     case 0: extensions_mask = get_bits(&s->gb, 12); break;

  1738.     case 1: extensions_mask = DCA_EXT_EXSS_XLL;     break;

  1739.     case 2: extensions_mask = DCA_EXT_EXSS_LBR;     break;

  1740.     case 3: extensions_mask = 0; /* aux coding */   break;

  1741.     }

  1742. 

  1743.     /* not parsed further, we were only interested in the extensions mask */

  1744. 

  1745.     if (get_bits_left(&s->gb) < 0)

  1746.         return -1;

  1747. 

  1748.     if (get_bits_count(&s->gb) - header_pos > header_size * 8) {

  1749.         av_log(s->avctx, AV_LOG_WARNING, "Asset header size mismatch.\n");

  1750.         return -1;

  1751.     }

  1752.     skip_bits_long(&s->gb, header_pos + header_size * 8 - get_bits_count(&s->gb));

  1753. 

  1754.     if (extensions_mask & DCA_EXT_EXSS_XLL)

  1755.         s->profile = FF_PROFILE_DTS_HD_MA;

  1756.     else if (extensions_mask & (DCA_EXT_EXSS_XBR | DCA_EXT_EXSS_X96 |

  1757.                                 DCA_EXT_EXSS_XXCH))

  1758.         s->profile = FF_PROFILE_DTS_HD_HRA;

  1759. 

  1760.     if (!(extensions_mask & DCA_EXT_CORE))

  1761.         av_log(s->avctx, AV_LOG_WARNING, "DTS core detection mismatch.\n");

  1762.     if ((extensions_mask & DCA_CORE_EXTS) != s->core_ext_mask)

  1763.         av_log(s->avctx, AV_LOG_WARNING,

  1764.                "DTS extensions detection mismatch (%d, %d)\n",

  1765.                extensions_mask & DCA_CORE_EXTS, s->core_ext_mask);

  1766. 

  1767.     return 0;

  1768. }

  1769. 

  1770. static int dca_xbr_parse_frame(DCAContext *s)

  1771. {

  1772.     int scale_table_high[DCA_CHSET_CHANS_MAX][DCA_SUBBANDS][2];

  1773.     int active_bands[DCA_CHSETS_MAX][DCA_CHSET_CHANS_MAX];

  1774.     int abits_high[DCA_CHSET_CHANS_MAX][DCA_SUBBANDS];

  1775.     int anctemp[DCA_CHSET_CHANS_MAX];

  1776.     int chset_fsize[DCA_CHSETS_MAX];

  1777.     int n_xbr_ch[DCA_CHSETS_MAX];

  1778.     int hdr_size, num_chsets, xbr_tmode, hdr_pos;

  1779.     int i, j, k, l, chset, chan_base;

  1780. 

  1781.     av_log(s->avctx, AV_LOG_DEBUG, "DTS-XBR: decoding XBR extension\n");

  1782. 

  1783.     /* get bit position of sync header */

  1784.     hdr_pos = get_bits_count(&s->gb) - 32;

  1785. 

  1786.     hdr_size = get_bits(&s->gb, 6) + 1;

  1787.     num_chsets = get_bits(&s->gb, 2) + 1;

  1788. 

  1789.     for(i = 0; i < num_chsets; i++)

  1790.         chset_fsize[i] = get_bits(&s->gb, 14) + 1;

  1791. 

  1792.     xbr_tmode = get_bits1(&s->gb);

  1793. 

  1794.     for(i = 0; i < num_chsets; i++) {

  1795.         n_xbr_ch[i] = get_bits(&s->gb, 3) + 1;

  1796.         k = get_bits(&s->gb, 2) + 5;

  1797.         for(j = 0; j < n_xbr_ch[i]; j++)

  1798.             active_bands[i][j] = get_bits(&s->gb, k) + 1;

  1799.     }

  1800. 

  1801.     /* skip to the end of the header */

  1802.     i = get_bits_count(&s->gb);

  1803.     if(hdr_pos + hdr_size * 8 > i)

  1804.         skip_bits_long(&s->gb, hdr_pos + hdr_size * 8 - i);

  1805. 

  1806.     /* loop over the channel data sets */

  1807.     /* only decode as many channels as we've decoded base data for */

  1808.     for(chset = 0, chan_base = 0;

  1809.         chset < num_chsets && chan_base + n_xbr_ch[chset] <= s->prim_channels;

  1810.         chan_base += n_xbr_ch[chset++]) {

  1811.         int start_posn = get_bits_count(&s->gb);

  1812.         int subsubframe = 0;

  1813.         int subframe = 0;

  1814. 

  1815.         /* loop over subframes */

  1816.         for (k = 0; k < (s->sample_blocks / 8); k++) {

  1817.             /* parse header if we're on first subsubframe of a block */

  1818.             if(subsubframe == 0) {

  1819.                 /* Parse subframe header */

  1820.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1821.                     anctemp[i] = get_bits(&s->gb, 2) + 2;

  1822.                 }

  1823. 

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

  1825.                     get_array(&s->gb, abits_high[i], active_bands[chset][i], anctemp[i]);

  1826.                 }

  1827. 

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

  1829.                     anctemp[i] = get_bits(&s->gb, 3);

  1830.                     if(anctemp[i] < 1) {

  1831.                         av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: SYNC ERROR\n");

  1832.                         return AVERROR_INVALIDDATA;

  1833.                     }

  1834.                 }

  1835. 

  1836.                 /* generate scale factors */

  1837.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1838.                     const uint32_t *scale_table;

  1839.                     int nbits;

  1840. 

  1841.                     if (s->scalefactor_huffman[chan_base+i] == 6) {

  1842.                         scale_table = scale_factor_quant7;

  1843.                     } else {

  1844.                         scale_table = scale_factor_quant6;

  1845.                     }

  1846. 

  1847.                     nbits = anctemp[i];

  1848. 

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

  1850.                         if(abits_high[i][j] > 0) {

  1851.                             scale_table_high[i][j][0] =

  1852.                                 scale_table[get_bits(&s->gb, nbits)];

  1853. 

  1854.                             if(xbr_tmode && s->transition_mode[i][j]) {

  1855.                                 scale_table_high[i][j][1] =

  1856.                                     scale_table[get_bits(&s->gb, nbits)];

  1857.                             }

  1858.                         }

  1859.                     }

  1860.                 }

  1861.             }

  1862. 

  1863.             /* decode audio array for this block */

  1864.             for(i = 0; i < n_xbr_ch[chset]; i++) {

  1865.                 for(j = 0; j < active_bands[chset][i]; j++) {

  1866.                     const int xbr_abits = abits_high[i][j];

  1867.                     const float quant_step_size = lossless_quant_d[xbr_abits];

  1868.                     const int sfi = xbr_tmode && s->transition_mode[i][j] && subsubframe >= s->transition_mode[i][j];

  1869.                     const float rscale = quant_step_size * scale_table_high[i][j][sfi];

  1870.                     float *subband_samples = s->subband_samples[k][chan_base+i][j];

  1871.                     int block[8];

  1872. 

  1873.                     if(xbr_abits <= 0)

  1874.                         continue;

  1875. 

  1876.                     if(xbr_abits > 7) {

  1877.                         get_array(&s->gb, block, 8, xbr_abits - 3);

  1878.                     } else {

  1879.                         int block_code1, block_code2, size, levels, err;

  1880. 

  1881.                         size   = abits_sizes[xbr_abits - 1];

  1882.                         levels = abits_levels[xbr_abits - 1];

  1883. 

  1884.                         block_code1 = get_bits(&s->gb, size);

  1885.                         block_code2 = get_bits(&s->gb, size);

  1886.                         err = decode_blockcodes(block_code1, block_code2,

  1887.                                                 levels, block);

  1888.                         if (err) {

  1889.                             av_log(s->avctx, AV_LOG_ERROR,

  1890.                                    "ERROR: DTS-XBR: block code look-up failed\n");

  1891.                             return AVERROR_INVALIDDATA;

  1892.                         }

  1893.                     }

  1894. 

  1895.                     /* scale & sum into subband */

  1896.                     for(l = 0; l < 8; l++)

  1897.                         subband_samples[l] += (float)block[l] * rscale;

  1898.                 }

  1899.             }

  1900. 

  1901.             /* check DSYNC marker */

  1902.             if(s->aspf || subsubframe == s->subsubframes[subframe] - 1) {

  1903.                 if(get_bits(&s->gb, 16) != 0xffff) {

  1904.                     av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: Didn't get subframe DSYNC\n");

  1905.                     return AVERROR_INVALIDDATA;

  1906.                 }

  1907.             }

  1908. 

  1909.             /* advance sub-sub-frame index */

  1910.             if(++subsubframe >= s->subsubframes[subframe]) {

  1911.                 subsubframe = 0;

  1912.                 subframe++;

  1913.             }

  1914.         }

  1915. 

  1916.         /* skip to next channel set */

  1917.         i = get_bits_count(&s->gb);

  1918.         if(start_posn + chset_fsize[chset] * 8 != i) {

  1919.             j = start_posn + chset_fsize[chset] * 8 - i;

  1920.             if(j < 0 || j >= 8)

  1921.                 av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: end of channel set,"

  1922.                        " skipping further than expected (%d bits)\n", j);

  1923.             skip_bits_long(&s->gb, j);

  1924.         }

  1925.     }

  1926. 

  1927.     return 0;

  1928. }

  1929. 

  1930. /* parse initial header for XXCH and dump details */

  1931. static int dca_xxch_decode_frame(DCAContext *s)

  1932. {

  1933.     int hdr_size, spkmsk_bits, num_chsets, core_spk, hdr_pos;

  1934.     int i, chset, base_channel, chstart, fsize[8];

  1935. 

  1936.     /* assume header word has already been parsed */

  1937.     hdr_pos     = get_bits_count(&s->gb) - 32;

  1938.     hdr_size    = get_bits(&s->gb, 6) + 1;

  1939.   /*chhdr_crc   =*/ skip_bits1(&s->gb);

  1940.     spkmsk_bits = get_bits(&s->gb, 5) + 1;

  1941.     num_chsets  = get_bits(&s->gb, 2) + 1;

  1942. 

  1943.     for (i = 0; i < num_chsets; i++)

  1944.         fsize[i] = get_bits(&s->gb, 14) + 1;

  1945. 

  1946.     core_spk               = get_bits(&s->gb, spkmsk_bits);

  1947.     s->xxch_core_spkmask   = core_spk;

  1948.     s->xxch_nbits_spk_mask = spkmsk_bits;

  1949.     s->xxch_dmix_embedded  = 0;

  1950. 

  1951.     /* skip to the end of the header */

  1952.     i = get_bits_count(&s->gb);

  1953.     if (hdr_pos + hdr_size * 8 > i)

  1954.         skip_bits_long(&s->gb, hdr_pos + hdr_size * 8 - i);

  1955. 

  1956.     for (chset = 0; chset < num_chsets; chset++) {

  1957.         chstart       = get_bits_count(&s->gb);

  1958.         base_channel  = s->prim_channels;

  1959.         s->xxch_chset = chset;

  1960. 

  1961.         /* XXCH and Core headers differ, see 6.4.2 "XXCH Channel Set Header" vs.

  1962.            5.3.2 "Primary Audio Coding Header", DTS Spec 1.3.1 */

  1963.         dca_parse_audio_coding_header(s, base_channel, 1);

  1964. 

  1965.         /* decode channel data */

  1966.         for (i = 0; i < (s->sample_blocks / 8); i++) {

  1967.             if (dca_decode_block(s, base_channel, i)) {

  1968.                 av_log(s->avctx, AV_LOG_ERROR,

  1969.                        "Error decoding DTS-XXCH extension\n");

  1970.                 continue;

  1971.             }

  1972.         }

  1973. 

  1974.         /* skip to end of this section */

  1975.         i = get_bits_count(&s->gb);

  1976.         if (chstart + fsize[chset] * 8 > i)

  1977.             skip_bits_long(&s->gb, chstart + fsize[chset] * 8 - i);

  1978.     }

  1979.     s->xxch_chset = num_chsets;

  1980. 

  1981.     return 0;

  1982. }

  1983. 

  1984. /**

  1985.  * Parse extension substream header (HD)

  1986.  */

  1987. static void dca_exss_parse_header(DCAContext *s)

  1988. {

  1989.     int asset_size[8];

  1990.     int ss_index;

  1991.     int blownup;

  1992.     int num_audiop = 1;

  1993.     int num_assets = 1;

  1994.     int active_ss_mask[8];

  1995.     int i, j;

  1996.     int start_posn;

  1997.     int hdrsize;

  1998.     uint32_t mkr;

  1999. 

  2000.     if (get_bits_left(&s->gb) < 52)

  2001.         return;

  2002. 

  2003.     start_posn = get_bits_count(&s->gb) - 32;

  2004. 

  2005.     skip_bits(&s->gb, 8); // user data

  2006.     ss_index = get_bits(&s->gb, 2);

  2007. 

  2008.     blownup = get_bits1(&s->gb);

  2009.     hdrsize = get_bits(&s->gb,  8 + 4 * blownup) + 1; // header_size

  2010.     skip_bits(&s->gb, 16 + 4 * blownup); // hd_size

  2011. 

  2012.     s->static_fields = get_bits1(&s->gb);

  2013.     if (s->static_fields) {

  2014.         skip_bits(&s->gb, 2); // reference clock code

  2015.         skip_bits(&s->gb, 3); // frame duration code

  2016. 

  2017.         if (get_bits1(&s->gb))

  2018.             skip_bits_long(&s->gb, 36); // timestamp

  2019. 

  2020.         /* a single stream can contain multiple audio assets that can be

  2021.          * combined to form multiple audio presentations */

  2022. 

  2023.         num_audiop = get_bits(&s->gb, 3) + 1;

  2024.         if (num_audiop > 1) {

  2025.             avpriv_request_sample(s->avctx,

  2026.                                   "Multiple DTS-HD audio presentations");

  2027.             /* ignore such streams for now */

  2028.             return;

  2029.         }

  2030. 

  2031.         num_assets = get_bits(&s->gb, 3) + 1;

  2032.         if (num_assets > 1) {

  2033.             avpriv_request_sample(s->avctx, "Multiple DTS-HD audio assets");

  2034.             /* ignore such streams for now */

  2035.             return;

  2036.         }

  2037. 

  2038.         for (i = 0; i < num_audiop; i++)

  2039.             active_ss_mask[i] = get_bits(&s->gb, ss_index + 1);

  2040. 

  2041.         for (i = 0; i < num_audiop; i++)

  2042.             for (j = 0; j <= ss_index; j++)

  2043.                 if (active_ss_mask[i] & (1 << j))

  2044.                     skip_bits(&s->gb, 8); // active asset mask

  2045. 

  2046.         s->mix_metadata = get_bits1(&s->gb);

  2047.         if (s->mix_metadata) {

  2048.             int mix_out_mask_size;

  2049. 

  2050.             skip_bits(&s->gb, 2); // adjustment level

  2051.             mix_out_mask_size  = (get_bits(&s->gb, 2) + 1) << 2;

  2052.             s->num_mix_configs =  get_bits(&s->gb, 2) + 1;

  2053. 

  2054.             for (i = 0; i < s->num_mix_configs; i++) {

  2055.                 int mix_out_mask        = get_bits(&s->gb, mix_out_mask_size);

  2056.                 s->mix_config_num_ch[i] = dca_exss_mask2count(mix_out_mask);

  2057.             }

  2058.         }

  2059.     }

  2060. 

  2061.     for (i = 0; i < num_assets; i++)

  2062.         asset_size[i] = get_bits_long(&s->gb, 16 + 4 * blownup);

  2063. 

  2064.     for (i = 0; i < num_assets; i++) {

  2065.         if (dca_exss_parse_asset_header(s))

  2066.             return;

  2067.     }

  2068. 

  2069.     /* not parsed further, we were only interested in the extensions mask

  2070.      * from the asset header */

  2071. 

  2072.     if (num_assets > 0) {

  2073.         j = get_bits_count(&s->gb);

  2074.         if (start_posn + hdrsize * 8 > j)

  2075.             skip_bits_long(&s->gb, start_posn + hdrsize * 8 - j);

  2076. 

  2077.         for (i = 0; i < num_assets; i++) {

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

  2079.             mkr        = get_bits_long(&s->gb, 32);

  2080. 

  2081.             /* parse extensions that we know about */

  2082.             if (mkr == 0x655e315e) {

  2083.                 dca_xbr_parse_frame(s);

  2084.             } else if (mkr == 0x47004a03) {

  2085.                 dca_xxch_decode_frame(s);

  2086.                 s->core_ext_mask |= DCA_EXT_XXCH; /* xxx use for chan reordering */

  2087.             } else {

  2088.                 av_log(s->avctx, AV_LOG_DEBUG,

  2089.                        "DTS-ExSS: unknown marker = 0x%08x\n", mkr);

  2090.             }

  2091. 

  2092.             /* skip to end of block */

  2093.             j = get_bits_count(&s->gb);

  2094.             if (start_posn + asset_size[i] * 8 > j)

  2095.                 skip_bits_long(&s->gb, start_posn + asset_size[i] * 8 - j);

  2096.         }

  2097.     }

  2098. }

  2099. 

  2100. /**

  2101.  * Main frame decoding function

  2102.  * FIXME add arguments

  2103.  */

  2104. static int dca_decode_frame(AVCodecContext *avctx, void *data,

  2105.                             int *got_frame_ptr, AVPacket *avpkt)

  2106. {

  2107.     AVFrame *frame     = data;

  2108.     const uint8_t *buf = avpkt->data;

  2109.     int buf_size = avpkt->size;

  2110.     int channel_mask;

  2111.     int channel_layout;

  2112.     int lfe_samples;

  2113.     int num_core_channels = 0;

  2114.     int i, ret;

  2115.     float **samples_flt;

  2116.     float *src_chan;

  2117.     float *dst_chan;

  2118.     DCAContext *s = avctx->priv_data;

  2119.     int core_ss_end;

  2120.     int channels, full_channels;

  2121.     float scale;

  2122.     int achan;

  2123.     int chset;

  2124.     int mask;

  2125.     int lavc;

  2126.     int posn;

  2127.     int j, k;

  2128.     int endch;

  2129. 

  2130.     s->xch_present = 0;

  2131. 

  2132.     s->dca_buffer_size = ff_dca_convert_bitstream(buf, buf_size, s->dca_buffer,

  2133.                                                   DCA_MAX_FRAME_SIZE + DCA_MAX_EXSS_HEADER_SIZE);

  2134.     if (s->dca_buffer_size == AVERROR_INVALIDDATA) {

  2135.         av_log(avctx, AV_LOG_ERROR, "Not a valid DCA frame\n");

  2136.         return AVERROR_INVALIDDATA;

  2137.     }

  2138. 

  2139.     init_get_bits(&s->gb, s->dca_buffer, s->dca_buffer_size * 8);

  2140.     if ((ret = dca_parse_frame_header(s)) < 0) {

  2141.         //seems like the frame is corrupt, try with the next one

  2142.         return ret;

  2143.     }

  2144.     //set AVCodec values with parsed data

  2145.     avctx->sample_rate = s->sample_rate;

  2146.     avctx->bit_rate    = s->bit_rate;

  2147. 

  2148.     s->profile = FF_PROFILE_DTS;

  2149. 

  2150.     for (i = 0; i < (s->sample_blocks / 8); i++) {

  2151.         if ((ret = dca_decode_block(s, 0, i))) {

  2152.             av_log(avctx, AV_LOG_ERROR, "error decoding block\n");

  2153.             return ret;

  2154.         }

  2155.     }

  2156. 

  2157.     /* record number of core channels incase less than max channels are requested */

  2158.     num_core_channels = s->prim_channels;

  2159. 

  2160.     if (s->prim_channels + !!s->lfe > 2 &&

  2161.         avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {

  2162.             /* Stereo downmix coefficients

  2163.              *

  2164.              * The decoder can only downmix to 2-channel, so we need to ensure

  2165.              * embedded downmix coefficients are actually targeting 2-channel.

  2166.              */

  2167.             if (s->core_downmix && (s->core_downmix_amode == DCA_STEREO ||

  2168.                                     s->core_downmix_amode == DCA_STEREO_TOTAL)) {

  2169.                 int sign, code;

  2170.                 for (i = 0; i < s->prim_channels + !!s->lfe; i++) {

  2171.                     sign = s->core_downmix_codes[i][0] & 0x100 ? 1 : -1;

  2172.                     code = s->core_downmix_codes[i][0] & 0x0FF;

  2173.                     s->downmix_coef[i][0] = (!code ? 0.0f :

  2174.                                              sign * dca_dmixtable[code - 1]);

  2175.                     sign = s->core_downmix_codes[i][1] & 0x100 ? 1 : -1;

  2176.                     code = s->core_downmix_codes[i][1] & 0x0FF;

  2177.                     s->downmix_coef[i][1] = (!code ? 0.0f :

  2178.                                              sign * dca_dmixtable[code - 1]);

  2179.                 }

  2180.             } else {

  2181.                 int am = s->amode & DCA_CHANNEL_MASK;

  2182.                 if (am >= FF_ARRAY_ELEMS(dca_default_coeffs)) {

  2183.                     av_log(s->avctx, AV_LOG_ERROR,

  2184.                            "Invalid channel mode %d\n", am);

  2185.                     return AVERROR_INVALIDDATA;

  2186.                 }

  2187.                 if (s->prim_channels + !!s->lfe >

  2188.                     FF_ARRAY_ELEMS(dca_default_coeffs[0])) {

  2189.                     avpriv_request_sample(s->avctx, "Downmixing %d channels",

  2190.                                           s->prim_channels + !!s->lfe);

  2191.                     return AVERROR_PATCHWELCOME;

  2192.                 }

  2193.                 for (i = 0; i < s->prim_channels + !!s->lfe; i++) {

  2194.                     s->downmix_coef[i][0] = dca_default_coeffs[am][i][0];

  2195.                     s->downmix_coef[i][1] = dca_default_coeffs[am][i][1];

  2196.                 }

  2197.             }

  2198.             av_dlog(s->avctx, "Stereo downmix coeffs:\n");

  2199.             for (i = 0; i < s->prim_channels + !!s->lfe; i++) {

  2200.                 av_dlog(s->avctx, "L, input channel %d = %f\n", i,

  2201.                         s->downmix_coef[i][0]);

  2202.                 av_dlog(s->avctx, "R, input channel %d = %f\n", i,

  2203.                         s->downmix_coef[i][1]);

  2204.             }

  2205.             av_dlog(s->avctx, "\n");

  2206.     }

  2207. 

  2208.     if (s->ext_coding)

  2209.         s->core_ext_mask = dca_ext_audio_descr_mask[s->ext_descr];

  2210.     else

  2211.         s->core_ext_mask = 0;

  2212. 

  2213.     core_ss_end = FFMIN(s->frame_size, s->dca_buffer_size) * 8;

  2214. 

  2215.     /* only scan for extensions if ext_descr was unknown or indicated a

  2216.      * supported XCh extension */

  2217.     if (s->core_ext_mask < 0 || s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH)) {

  2218. 

  2219.         /* if ext_descr was unknown, clear s->core_ext_mask so that the

  2220.          * extensions scan can fill it up */

  2221.         s->core_ext_mask = FFMAX(s->core_ext_mask, 0);

  2222. 

  2223.         /* extensions start at 32-bit boundaries into bitstream */

  2224.         skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);

  2225. 

  2226.         while (core_ss_end - get_bits_count(&s->gb) >= 32) {

  2227.             uint32_t bits = get_bits_long(&s->gb, 32);

  2228. 

  2229.             switch (bits) {

  2230.             case 0x5a5a5a5a: {

  2231.                 int ext_amode, xch_fsize;

  2232. 

  2233.                 s->xch_base_channel = s->prim_channels;

  2234. 

  2235.                 /* validate sync word using XCHFSIZE field */

  2236.                 xch_fsize = show_bits(&s->gb, 10);

  2237.                 if ((s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize) &&

  2238.                     (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize + 1))

  2239.                     continue;

  2240. 

  2241.                 /* skip length-to-end-of-frame field for the moment */

  2242.                 skip_bits(&s->gb, 10);

  2243. 

  2244.                 s->core_ext_mask |= DCA_EXT_XCH;

  2245. 

  2246.                 /* extension amode(number of channels in extension) should be 1 */

  2247.                 /* AFAIK XCh is not used for more channels */

  2248.                 if ((ext_amode = get_bits(&s->gb, 4)) != 1) {

  2249.                     av_log(avctx, AV_LOG_ERROR, "XCh extension amode %d not"

  2250.                            " supported!\n", ext_amode);

  2251.                     continue;

  2252.                 }

  2253. 

  2254.                 if (s->xch_base_channel < 2) {

  2255.                     avpriv_request_sample(avctx, "XCh with fewer than 2 base channels");

  2256.                     continue;

  2257.                 }

  2258. 

  2259.                 /* much like core primary audio coding header */

  2260.                 dca_parse_audio_coding_header(s, s->xch_base_channel, 0);

  2261. 

  2262.                 for (i = 0; i < (s->sample_blocks / 8); i++)

  2263.                     if ((ret = dca_decode_block(s, s->xch_base_channel, i))) {

  2264.                         av_log(avctx, AV_LOG_ERROR, "error decoding XCh extension\n");

  2265.                         continue;

  2266.                     }

  2267. 

  2268.                 s->xch_present = 1;

  2269.                 break;

  2270.             }

  2271.             case 0x47004a03:

  2272.                 /* XXCh: extended channels */

  2273.                 /* usually found either in core or HD part in DTS-HD HRA streams,

  2274.                  * but not in DTS-ES which contains XCh extensions instead */

  2275.                 s->core_ext_mask |= DCA_EXT_XXCH;

  2276.                 dca_xxch_decode_frame(s);

  2277.                 break;

  2278. 

  2279.             case 0x1d95f262: {

  2280.                 int fsize96 = show_bits(&s->gb, 12) + 1;

  2281.                 if (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + fsize96)

  2282.                     continue;

  2283. 

  2284.                 av_log(avctx, AV_LOG_DEBUG, "X96 extension found at %d bits\n",

  2285.                        get_bits_count(&s->gb));

  2286.                 skip_bits(&s->gb, 12);

  2287.                 av_log(avctx, AV_LOG_DEBUG, "FSIZE96 = %d bytes\n", fsize96);

  2288.                 av_log(avctx, AV_LOG_DEBUG, "REVNO = %d\n", get_bits(&s->gb, 4));

  2289. 

  2290.                 s->core_ext_mask |= DCA_EXT_X96;

  2291.                 break;

  2292.             }

  2293.             }

  2294. 

  2295.             skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);

  2296.         }

  2297.     } else {

  2298.         /* no supported extensions, skip the rest of the core substream */

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

  2300.     }

  2301. 

  2302.     if (s->core_ext_mask & DCA_EXT_X96)

  2303.         s->profile = FF_PROFILE_DTS_96_24;

  2304.     else if (s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH))

  2305.         s->profile = FF_PROFILE_DTS_ES;

  2306. 

  2307.     /* check for ExSS (HD part) */

  2308.     if (s->dca_buffer_size - s->frame_size > 32 &&

  2309.         get_bits_long(&s->gb, 32) == DCA_HD_MARKER)

  2310.         dca_exss_parse_header(s);

  2311. 

  2312.     avctx->profile = s->profile;

  2313. 

  2314.     full_channels = channels = s->prim_channels + !!s->lfe;

  2315. 

  2316.     /* If we have XXCH then the channel layout is managed differently */

  2317.     /* note that XLL will also have another way to do things */

  2318.     if (!(s->core_ext_mask & DCA_EXT_XXCH)

  2319.         || (s->core_ext_mask & DCA_EXT_XXCH && avctx->request_channels > 0

  2320.             && avctx->request_channels

  2321.             < num_core_channels + !!s->lfe + s->xxch_chset_nch[0]))

  2322.     { /* xxx should also do MA extensions */

  2323.         if (s->amode < 16) {

  2324.             avctx->channel_layout = dca_core_channel_layout[s->amode];

  2325. #if FF_API_REQUEST_CHANNELS

  2326. FF_DISABLE_DEPRECATION_WARNINGS

  2327.             if (s->xch_present && !s->xch_disable &&

  2328.                 (!avctx->request_channels ||

  2329.                  avctx->request_channels > num_core_channels + !!s->lfe)) {

  2330. FF_ENABLE_DEPRECATION_WARNINGS

  2331. #else

  2332.             if (s->xch_present && !s->xch_disable) {

  2333. #endif

  2334.                 avctx->channel_layout |= AV_CH_BACK_CENTER;

  2335.                 if (s->lfe) {

  2336.                     avctx->channel_layout |= AV_CH_LOW_FREQUENCY;

  2337.                     s->channel_order_tab = dca_channel_reorder_lfe_xch[s->amode];

  2338.                 } else {

  2339.                     s->channel_order_tab = dca_channel_reorder_nolfe_xch[s->amode];

  2340.                 }

  2341.                 if (s->channel_order_tab[s->xch_base_channel] < 0)

  2342.                     return AVERROR_INVALIDDATA;

  2343.             } else {

  2344.                 channels = num_core_channels + !!s->lfe;

  2345.                 s->xch_present = 0; /* disable further xch processing */

  2346.                 if (s->lfe) {

  2347.                     avctx->channel_layout |= AV_CH_LOW_FREQUENCY;

  2348.                     s->channel_order_tab = dca_channel_reorder_lfe[s->amode];

  2349.                 } else

  2350.                     s->channel_order_tab = dca_channel_reorder_nolfe[s->amode];

  2351.             }

  2352. 

  2353.             if (channels > !!s->lfe &&

  2354.                 s->channel_order_tab[channels - 1 - !!s->lfe] < 0)

  2355.                 return AVERROR_INVALIDDATA;

  2356. 

  2357.             if (av_get_channel_layout_nb_channels(avctx->channel_layout) != channels) {

  2358.                 av_log(avctx, AV_LOG_ERROR, "Number of channels %d mismatches layout %d\n", channels, av_get_channel_layout_nb_channels(avctx->channel_layout));

  2359.                 return AVERROR_INVALIDDATA;

  2360.             }

  2361. 

  2362.             if (s->prim_channels + !!s->lfe > 2 &&

  2363.                 avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {

  2364.                 channels = 2;

  2365.                 s->output = DCA_STEREO;

  2366.                 avctx->channel_layout = AV_CH_LAYOUT_STEREO;

  2367.             }

  2368.             else if (avctx->request_channel_layout & AV_CH_LAYOUT_NATIVE) {

  2369.                 static const int8_t dca_channel_order_native[9] = { 0, 1, 2, 3, 4, 5, 6, 7, 8 };

  2370.                 s->channel_order_tab = dca_channel_order_native;

  2371.             }

  2372.             s->lfe_index = dca_lfe_index[s->amode];

  2373.         } else {

  2374.             av_log(avctx, AV_LOG_ERROR,

  2375.                    "Non standard configuration %d !\n", s->amode);

  2376.             return AVERROR_INVALIDDATA;

  2377.         }

  2378. 

  2379.         s->xxch_dmix_embedded = 0;

  2380.     } else {

  2381.         /* we only get here if an XXCH channel set can be added to the mix */

  2382.         channel_mask = s->xxch_core_spkmask;

  2383. 

  2384.         if (avctx->request_channels > 0

  2385.             && avctx->request_channels < s->prim_channels) {

  2386.             channels = num_core_channels + !!s->lfe;

  2387.             for (i = 0; i < s->xxch_chset && channels + s->xxch_chset_nch[i]

  2388.                                               <= avctx->request_channels; i++) {

  2389.                 channels += s->xxch_chset_nch[i];

  2390.                 channel_mask |= s->xxch_spk_masks[i];

  2391.             }

  2392.         } else {

  2393.             channels = s->prim_channels + !!s->lfe;

  2394.             for (i = 0; i < s->xxch_chset; i++) {

  2395.                 channel_mask |= s->xxch_spk_masks[i];

  2396.             }

  2397.         }

  2398. 

  2399.         /* Given the DTS spec'ed channel mask, generate an avcodec version */

  2400.         channel_layout = 0;

  2401.         for (i = 0; i < s->xxch_nbits_spk_mask; ++i) {

  2402.             if (channel_mask & (1 << i)) {

  2403.                 channel_layout |= map_xxch_to_native[i];

  2404.             }

  2405.         }

  2406. 

  2407.         /* make sure that we have managed to get equivelant dts/avcodec channel

  2408.          * masks in some sense -- unfortunately some channels could overlap */

  2409.         if (av_popcount(channel_mask) != av_popcount(channel_layout)) {

  2410.             av_log(avctx, AV_LOG_DEBUG,

  2411.                    "DTS-XXCH: Inconsistant avcodec/dts channel layouts\n");

  2412.             return AVERROR_INVALIDDATA;

  2413.         }

  2414. 

  2415.         avctx->channel_layout = channel_layout;

  2416. 

  2417.         if (!(avctx->request_channel_layout & AV_CH_LAYOUT_NATIVE)) {

  2418.             /* Estimate DTS --> avcodec ordering table */

  2419.             for (chset = -1, j = 0; chset < s->xxch_chset; ++chset) {

  2420.                 mask = chset >= 0 ? s->xxch_spk_masks[chset]

  2421.                                   : s->xxch_core_spkmask;

  2422.                 for (i = 0; i < s->xxch_nbits_spk_mask; i++) {

  2423.                     if (mask & ~(DCA_XXCH_LFE1 | DCA_XXCH_LFE2) & (1 << i)) {

  2424.                         lavc = map_xxch_to_native[i];

  2425.                         posn = av_popcount(channel_layout & (lavc - 1));

  2426.                         s->xxch_order_tab[j++] = posn;

  2427.                     }

  2428.                 }

  2429.             }

  2430. 

  2431.             s->lfe_index = av_popcount(channel_layout & (AV_CH_LOW_FREQUENCY-1));

  2432.         } else { /* native ordering */

  2433.             for (i = 0; i < channels; i++)

  2434.                 s->xxch_order_tab[i] = i;

  2435. 

  2436.             s->lfe_index = channels - 1;

  2437.         }

  2438. 

  2439.         s->channel_order_tab = s->xxch_order_tab;

  2440.     }

  2441. 

  2442.     if (avctx->channels != channels) {

  2443.         if (avctx->channels)

  2444.             av_log(avctx, AV_LOG_INFO, "Number of channels changed in DCA decoder (%d -> %d)\n", avctx->channels, channels);

  2445.         avctx->channels = channels;

  2446.     }

  2447. 

  2448.     /* get output buffer */

  2449.     frame->nb_samples = 256 * (s->sample_blocks / 8);

  2450.     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)

  2451.         return ret;

  2452.     samples_flt = (float **)frame->extended_data;

  2453. 

  2454.     /* allocate buffer for extra channels if downmixing */

  2455.     if (avctx->channels < full_channels) {

  2456.         ret = av_samples_get_buffer_size(NULL, full_channels - channels,

  2457.                                          frame->nb_samples,

  2458.                                          avctx->sample_fmt, 0);

  2459.         if (ret < 0)

  2460.             return ret;

  2461. 

  2462.         av_fast_malloc(&s->extra_channels_buffer,

  2463.                        &s->extra_channels_buffer_size, ret);

  2464.         if (!s->extra_channels_buffer)

  2465.             return AVERROR(ENOMEM);

  2466. 

  2467.         ret = av_samples_fill_arrays((uint8_t **)s->extra_channels, NULL,

  2468.                                      s->extra_channels_buffer,

  2469.                                      full_channels - channels,

  2470.                                      frame->nb_samples, avctx->sample_fmt, 0);

  2471.         if (ret < 0)

  2472.             return ret;

  2473.     }

  2474. 

  2475.     /* filter to get final output */

  2476.     for (i = 0; i < (s->sample_blocks / 8); i++) {

  2477.         int ch;

  2478. 

  2479.         for (ch = 0; ch < channels; ch++)

  2480.             s->samples_chanptr[ch] = samples_flt[ch] + i * 256;

  2481.         for (; ch < full_channels; ch++)

  2482.             s->samples_chanptr[ch] = s->extra_channels[ch - channels] + i * 256;

  2483. 

  2484.         dca_filter_channels(s, i);

  2485. 

  2486.         /* If this was marked as a DTS-ES stream we need to subtract back- */

  2487.         /* channel from SL & SR to remove matrixed back-channel signal */

  2488.         if ((s->source_pcm_res & 1) && s->xch_present) {

  2489.             float *back_chan = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel]];

  2490.             float *lt_chan   = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel - 2]];

  2491.             float *rt_chan   = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel - 1]];

  2492.             s->fdsp.vector_fmac_scalar(lt_chan, back_chan, -M_SQRT1_2, 256);

  2493.             s->fdsp.vector_fmac_scalar(rt_chan, back_chan, -M_SQRT1_2, 256);

  2494.         }

  2495. 

  2496.         /* If stream contains XXCH, we might need to undo an embedded downmix */

  2497.         if (s->xxch_dmix_embedded) {

  2498.             /* Loop over channel sets in turn */

  2499.             ch = num_core_channels;

  2500.             for (chset = 0; chset < s->xxch_chset; chset++) {

  2501.                 endch = ch + s->xxch_chset_nch[chset];

  2502.                 mask = s->xxch_dmix_embedded;

  2503. 

  2504.                 /* undo downmix */

  2505.                 for (j = ch; j < endch; j++) {

  2506.                     if (mask & (1 << j)) { /* this channel has been mixed-out */

  2507.                         src_chan = s->samples_chanptr[s->channel_order_tab[j]];

  2508.                         for (k = 0; k < endch; k++) {

  2509.                             achan = s->channel_order_tab[k];

  2510.                             scale = s->xxch_dmix_coeff[j][k];

  2511.                             if (scale != 0.0) {

  2512.                                 dst_chan = s->samples_chanptr[achan];

  2513.                                 s->fdsp.vector_fmac_scalar(dst_chan, src_chan,

  2514.                                                            -scale, 256);

  2515.                             }

  2516.                         }

  2517.                     }

  2518.                 }

  2519. 

  2520.                 /* if a downmix has been embedded then undo the pre-scaling */

  2521.                 if ((mask & (1 << ch)) && s->xxch_dmix_sf[chset] != 1.0f) {

  2522.                     scale = s->xxch_dmix_sf[chset];

  2523. 

  2524.                     for (j = 0; j < ch; j++) {

  2525.                         src_chan = s->samples_chanptr[s->channel_order_tab[j]];

  2526.                         for (k = 0; k < 256; k++)

  2527.                             src_chan[k] *= scale;

  2528.                     }

  2529. 

  2530.                     /* LFE channel is always part of core, scale if it exists */

  2531.                     if (s->lfe) {

  2532.                         src_chan = s->samples_chanptr[s->lfe_index];

  2533.                         for (k = 0; k < 256; k++)

  2534.                             src_chan[k] *= scale;

  2535.                     }

  2536.                 }

  2537. 

  2538.                 ch = endch;

  2539.             }

  2540. 

  2541.         }

  2542.     }

  2543. 

  2544.     /* update lfe history */

  2545.     lfe_samples = 2 * s->lfe * (s->sample_blocks / 8);

  2546.     for (i = 0; i < 2 * s->lfe * 4; i++)

  2547.         s->lfe_data[i] = s->lfe_data[i + lfe_samples];

  2548. 

  2549.     *got_frame_ptr = 1;

  2550. 

  2551.     return buf_size;

  2552. }

  2553. 

  2554. 

  2555. 

  2556. /**

  2557.  * DCA initialization

  2558.  *

  2559.  * @param avctx     pointer to the AVCodecContext

  2560.  */

  2561. 

  2562. static av_cold int dca_decode_init(AVCodecContext *avctx)

  2563. {

  2564.     DCAContext *s = avctx->priv_data;

  2565. 

  2566.     s->avctx = avctx;

  2567.     dca_init_vlcs();

  2568. 

  2569.     avpriv_float_dsp_init(&s->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);

  2570.     ff_mdct_init(&s->imdct, 6, 1, 1.0);

  2571.     ff_synth_filter_init(&s->synth);

  2572.     ff_dcadsp_init(&s->dcadsp);

  2573.     ff_fmt_convert_init(&s->fmt_conv, avctx);

  2574. 

  2575.     avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;

  2576. 

  2577.     /* allow downmixing to stereo */

  2578. #if FF_API_REQUEST_CHANNELS

  2579. FF_DISABLE_DEPRECATION_WARNINGS

  2580.     if (avctx->request_channels == 2)

  2581.         avctx->request_channel_layout = AV_CH_LAYOUT_STEREO;

  2582. FF_ENABLE_DEPRECATION_WARNINGS

  2583. #endif

  2584.     if (avctx->channels > 2 &&

  2585.         avctx->request_channel_layout == AV_CH_LAYOUT_STEREO)

  2586.         avctx->channels = 2;

  2587. 

  2588.     return 0;

  2589. }

  2590. 

  2591. static av_cold int dca_decode_end(AVCodecContext *avctx)

  2592. {

  2593.     DCAContext *s = avctx->priv_data;

  2594.     ff_mdct_end(&s->imdct);

  2595.     av_freep(&s->extra_channels_buffer);

  2596.     return 0;

  2597. }

  2598. 

  2599. static const AVProfile profiles[] = {

  2600.     { FF_PROFILE_DTS,        "DTS"        },

  2601.     { FF_PROFILE_DTS_ES,     "DTS-ES"     },

  2602.     { FF_PROFILE_DTS_96_24,  "DTS 96/24"  },

  2603.     { FF_PROFILE_DTS_HD_HRA, "DTS-HD HRA" },

  2604.     { FF_PROFILE_DTS_HD_MA,  "DTS-HD MA"  },

  2605.     { FF_PROFILE_UNKNOWN },

  2606. };

  2607. 

  2608. static const AVOption options[] = {

  2609.     { "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 },

  2610.     { NULL },

  2611. };

  2612. 

  2613. static const AVClass dca_decoder_class = {

  2614.     .class_name = "DCA decoder",

  2615.     .item_name  = av_default_item_name,

  2616.     .option     = options,

  2617.     .version    = LIBAVUTIL_VERSION_INT,

  2618.     .category   = AV_CLASS_CATEGORY_DECODER,

  2619. };

  2620. 

  2621. AVCodec ff_dca_decoder = {

  2622.     .name            = "dca",

  2623.     .long_name       = NULL_IF_CONFIG_SMALL("DCA (DTS Coherent Acoustics)"),

  2624.     .type            = AVMEDIA_TYPE_AUDIO,

  2625.     .id              = AV_CODEC_ID_DTS,

  2626.     .priv_data_size  = sizeof(DCAContext),

  2627.     .init            = dca_decode_init,

  2628.     .decode          = dca_decode_frame,

  2629.     .close           = dca_decode_end,

  2630.     .capabilities    = CODEC_CAP_CHANNEL_CONF | CODEC_CAP_DR1,

  2631.     .sample_fmts     = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,

  2632.                                                        AV_SAMPLE_FMT_NONE },

  2633.     .profiles        = NULL_IF_CONFIG_SMALL(profiles),

  2634.     .priv_class      = &dca_decoder_class,

  2635. };