falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
58566 Commits
32 Branches
298MB
Tree: c122e697fa
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'c122e697fa'
${ noResults }
FFmpeg/libavcodec/dcadec.c

2518 lines
93KB
Raw Blame History 

  1. /*

  2.  * DCA compatible decoder

  3.  * Copyright (C) 2004 Gildas Bazin

  4.  * Copyright (C) 2004 Benjamin Zores

  5.  * Copyright (C) 2006 Benjamin Larsson

  6.  * Copyright (C) 2007 Konstantin Shishkov

  7.  *

  8.  * This file is part of FFmpeg.

  9.  *

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

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

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

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

  14.  *

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

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

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

  18.  * Lesser General Public License for more details.

  19.  *

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

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

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

  23.  */

  24. 

  25. #include <math.h>

  26. #include <stddef.h>

  27. #include <stdio.h>

  28. 

  29. #include "libavutil/channel_layout.h"

  30. #include "libavutil/common.h"

  31. #include "libavutil/float_dsp.h"

  32. #include "libavutil/internal.h"

  33. #include "libavutil/intreadwrite.h"

  34. #include "libavutil/mathematics.h"

  35. #include "libavutil/samplefmt.h"

  36. #include "avcodec.h"

  37. #include "fft.h"

  38. #include "get_bits.h"

  39. #include "dcadata.h"

  40. #include "dcahuff.h"

  41. #include "dca.h"

  42. #include "mathops.h"

  43. #include "synth_filter.h"

  44. #include "dcadsp.h"

  45. #include "fmtconvert.h"

  46. #include "internal.h"

  47. 

  48. #if ARCH_ARM

  49. #   include "arm/dca.h"

  50. #endif

  51. 

  52. //#define TRACE

  53. 

  54. #define DCA_PRIM_CHANNELS_MAX  (7)

  55. #define DCA_SUBBANDS          (64)

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

  57. #define DCA_SUBSUBFRAMES_MAX   (4)

  58. #define DCA_SUBFRAMES_MAX     (16)

  59. #define DCA_BLOCKS_MAX        (16)

  60. #define DCA_LFE_MAX            (3)

  61. #define DCA_CHSETS_MAX         (4)

  62. #define DCA_CHSET_CHANS_MAX    (8)

  63. 

  64. enum DCAMode {

  65.     DCA_MONO = 0,

  66.     DCA_CHANNEL,

  67.     DCA_STEREO,

  68.     DCA_STEREO_SUMDIFF,

  69.     DCA_STEREO_TOTAL,

  70.     DCA_3F,

  71.     DCA_2F1R,

  72.     DCA_3F1R,

  73.     DCA_2F2R,

  74.     DCA_3F2R,

  75.     DCA_4F2R

  76. };

  77. 

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

  79. enum DCAExSSSpeakerMask {

  80.     DCA_EXSS_FRONT_CENTER          = 0x0001,

  81.     DCA_EXSS_FRONT_LEFT_RIGHT      = 0x0002,

  82.     DCA_EXSS_SIDE_REAR_LEFT_RIGHT  = 0x0004,

  83.     DCA_EXSS_LFE                   = 0x0008,

  84.     DCA_EXSS_REAR_CENTER           = 0x0010,

  85.     DCA_EXSS_FRONT_HIGH_LEFT_RIGHT = 0x0020,

  86.     DCA_EXSS_REAR_LEFT_RIGHT       = 0x0040,

  87.     DCA_EXSS_FRONT_HIGH_CENTER     = 0x0080,

  88.     DCA_EXSS_OVERHEAD              = 0x0100,

  89.     DCA_EXSS_CENTER_LEFT_RIGHT     = 0x0200,

  90.     DCA_EXSS_WIDE_LEFT_RIGHT       = 0x0400,

  91.     DCA_EXSS_SIDE_LEFT_RIGHT       = 0x0800,

  92.     DCA_EXSS_LFE2                  = 0x1000,

  93.     DCA_EXSS_SIDE_HIGH_LEFT_RIGHT  = 0x2000,

  94.     DCA_EXSS_REAR_HIGH_CENTER      = 0x4000,

  95.     DCA_EXSS_REAR_HIGH_LEFT_RIGHT  = 0x8000,

  96. };

  97. 

  98. enum DCAXxchSpeakerMask {

  99.     DCA_XXCH_FRONT_CENTER          = 0x0000001,

  100.     DCA_XXCH_FRONT_LEFT            = 0x0000002,

  101.     DCA_XXCH_FRONT_RIGHT           = 0x0000004,

  102.     DCA_XXCH_SIDE_REAR_LEFT        = 0x0000008,

  103.     DCA_XXCH_SIDE_REAR_RIGHT       = 0x0000010,

  104.     DCA_XXCH_LFE1                  = 0x0000020,

  105.     DCA_XXCH_REAR_CENTER           = 0x0000040,

  106.     DCA_XXCH_SURROUND_REAR_LEFT    = 0x0000080,

  107.     DCA_XXCH_SURROUND_REAR_RIGHT   = 0x0000100,

  108.     DCA_XXCH_SIDE_SURROUND_LEFT    = 0x0000200,

  109.     DCA_XXCH_SIDE_SURROUND_RIGHT   = 0x0000400,

  110.     DCA_XXCH_FRONT_CENTER_LEFT     = 0x0000800,

  111.     DCA_XXCH_FRONT_CENTER_RIGHT    = 0x0001000,

  112.     DCA_XXCH_FRONT_HIGH_LEFT       = 0x0002000,

  113.     DCA_XXCH_FRONT_HIGH_CENTER     = 0x0004000,

  114.     DCA_XXCH_FRONT_HIGH_RIGHT      = 0x0008000,

  115.     DCA_XXCH_LFE2                  = 0x0010000,

  116.     DCA_XXCH_SIDE_FRONT_LEFT       = 0x0020000,

  117.     DCA_XXCH_SIDE_FRONT_RIGHT      = 0x0040000,

  118.     DCA_XXCH_OVERHEAD              = 0x0080000,

  119.     DCA_XXCH_SIDE_HIGH_LEFT        = 0x0100000,

  120.     DCA_XXCH_SIDE_HIGH_RIGHT       = 0x0200000,

  121.     DCA_XXCH_REAR_HIGH_CENTER      = 0x0400000,

  122.     DCA_XXCH_REAR_HIGH_LEFT        = 0x0800000,

  123.     DCA_XXCH_REAR_HIGH_RIGHT       = 0x1000000,

  124.     DCA_XXCH_REAR_LOW_CENTER       = 0x2000000,

  125.     DCA_XXCH_REAR_LOW_LEFT         = 0x4000000,

  126.     DCA_XXCH_REAR_LOW_RIGHT        = 0x8000000,

  127. };

  128. 

  129. static const uint32_t map_xxch_to_native[28] = {

  130.     AV_CH_FRONT_CENTER,

  131.     AV_CH_FRONT_LEFT,

  132.     AV_CH_FRONT_RIGHT,

  133.     AV_CH_SIDE_LEFT,

  134.     AV_CH_SIDE_RIGHT,

  135.     AV_CH_LOW_FREQUENCY,

  136.     AV_CH_BACK_CENTER,

  137.     AV_CH_BACK_LEFT,

  138.     AV_CH_BACK_RIGHT,

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

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

  141.     AV_CH_FRONT_LEFT_OF_CENTER,

  142.     AV_CH_FRONT_RIGHT_OF_CENTER,

  143.     AV_CH_TOP_FRONT_LEFT,

  144.     AV_CH_TOP_FRONT_CENTER,

  145.     AV_CH_TOP_FRONT_RIGHT,

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

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

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

  149.     AV_CH_TOP_CENTER,           /* overhead */

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

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

  152.     AV_CH_TOP_BACK_CENTER,

  153.     AV_CH_TOP_BACK_LEFT,

  154.     AV_CH_TOP_BACK_RIGHT,

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

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

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

  158. };

  159. 

  160. enum DCAExtensionMask {

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

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

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

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

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

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

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

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

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

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

  171. };

  172. 

  173. /* -1 are reserved or unknown */

  174. static const int dca_ext_audio_descr_mask[] = {

  175.     DCA_EXT_XCH,

  176.     -1,

  177.     DCA_EXT_X96,

  178.     DCA_EXT_XCH | DCA_EXT_X96,

  179.     -1,

  180.     -1,

  181.     DCA_EXT_XXCH,

  182.     -1,

  183. };

  184. 

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

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

  187. 

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

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

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

  191.  *

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

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

  194.  * OV -> center back

  195.  * All 2 channel configurations -> AV_CH_LAYOUT_STEREO

  196.  */

  197. static const uint64_t dca_core_channel_layout[] = {

  198.     AV_CH_FRONT_CENTER,                                                     ///< 1, A

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

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

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

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

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

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

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

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

  207. 

  208.     AV_CH_LAYOUT_STEREO | AV_CH_FRONT_CENTER | AV_CH_SIDE_LEFT |

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

  210. 

  211.     AV_CH_LAYOUT_STEREO | AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT |

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

  213. 

  214.     AV_CH_LAYOUT_STEREO | AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT |

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

  216. 

  217.     AV_CH_FRONT_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER |

  218.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_BACK_CENTER   |

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

  220. 

  221.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_CENTER   |

  222.     AV_CH_FRONT_RIGHT_OF_CENTER | AV_CH_LAYOUT_STEREO |

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

  224. 

  225.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER |

  226.     AV_CH_LAYOUT_STEREO | AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT |

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

  228. 

  229.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_CENTER   |

  230.     AV_CH_FRONT_RIGHT_OF_CENTER | AV_CH_LAYOUT_STEREO |

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

  232. };

  233. 

  234. static const int8_t dca_lfe_index[] = {

  235.     1, 2, 2, 2, 2, 3, 2, 3, 2, 3, 2, 3, 1, 3, 2, 3

  236. };

  237. 

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

  239.     { 0, -1, -1, -1, -1, -1, -1, -1, -1},

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

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

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

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

  244.     { 2,  0,  1, -1, -1, -1, -1, -1, -1},

  245.     { 0,  1,  3, -1, -1, -1, -1, -1, -1},

  246.     { 2,  0,  1,  4, -1, -1, -1, -1, -1},

  247.     { 0,  1,  3,  4, -1, -1, -1, -1, -1},

  248.     { 2,  0,  1,  4,  5, -1, -1, -1, -1},

  249.     { 3,  4,  0,  1,  5,  6, -1, -1, -1},

  250.     { 2,  0,  1,  4,  5,  6, -1, -1, -1},

  251.     { 0,  6,  4,  5,  2,  3, -1, -1, -1},

  252.     { 4,  2,  5,  0,  1,  6,  7, -1, -1},

  253.     { 5,  6,  0,  1,  7,  3,  8,  4, -1},

  254.     { 4,  2,  5,  0,  1,  6,  8,  7, -1},

  255. };

  256. 

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

  258.     { 0,  2, -1, -1, -1, -1, -1, -1, -1},

  259.     { 0,  1,  3, -1, -1, -1, -1, -1, -1},

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

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

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

  263.     { 2,  0,  1,  4, -1, -1, -1, -1, -1},

  264.     { 0,  1,  3,  4, -1, -1, -1, -1, -1},

  265.     { 2,  0,  1,  4,  5, -1, -1, -1, -1},

  266.     { 0,  1,  4,  5,  3, -1, -1, -1, -1},

  267.     { 2,  0,  1,  5,  6,  4, -1, -1, -1},

  268.     { 3,  4,  0,  1,  6,  7,  5, -1, -1},

  269.     { 2,  0,  1,  4,  5,  6,  7, -1, -1},

  270.     { 0,  6,  4,  5,  2,  3,  7, -1, -1},

  271.     { 4,  2,  5,  0,  1,  7,  8,  6, -1},

  272.     { 5,  6,  0,  1,  8,  3,  9,  4,  7},

  273.     { 4,  2,  5,  0,  1,  6,  9,  8,  7},

  274. };

  275. 

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

  277.     { 0, -1, -1, -1, -1, -1, -1, -1, -1},

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

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

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

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

  282.     { 2,  0,  1, -1, -1, -1, -1, -1, -1},

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

  284.     { 2,  0,  1,  3, -1, -1, -1, -1, -1},

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

  286.     { 2,  0,  1,  3,  4, -1, -1, -1, -1},

  287.     { 2,  3,  0,  1,  4,  5, -1, -1, -1},

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

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

  290.     { 3,  2,  4,  0,  1,  5,  6, -1, -1},

  291.     { 4,  5,  0,  1,  6,  2,  7,  3, -1},

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

  293. };

  294. 

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

  296.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  297.     { 0,  1,  2, -1, -1, -1, -1, -1, -1},

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

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

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

  301.     { 2,  0,  1,  3, -1, -1, -1, -1, -1},

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

  303.     { 2,  0,  1,  3,  4, -1, -1, -1, -1},

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

  305.     { 2,  0,  1,  4,  5,  3, -1, -1, -1},

  306.     { 2,  3,  0,  1,  5,  6,  4, -1, -1},

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

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

  309.     { 3,  2,  4,  0,  1,  6,  7,  5, -1},

  310.     { 4,  5,  0,  1,  7,  2,  8,  3,  6},

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

  312. };

  313. 

  314. #define DCA_DOLBY                  101           /* FIXME */

  315. 

  316. #define DCA_CHANNEL_BITS             6

  317. #define DCA_CHANNEL_MASK          0x3F

  318. 

  319. #define DCA_LFE                   0x80

  320. 

  321. #define HEADER_SIZE                 14

  322. 

  323. #define DCA_MAX_FRAME_SIZE       16384

  324. #define DCA_MAX_EXSS_HEADER_SIZE  4096

  325. 

  326. #define DCA_BUFFER_PADDING_SIZE   1024

  327. 

  328. /** Bit allocation */

  329. typedef struct {

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

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

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

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

  334. } BitAlloc;

  335. 

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

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

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

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

  340. 

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

  342.                                          int idx)

  343. {

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

  345.            ba->offset;

  346. }

  347. 

  348. typedef struct {

  349.     AVCodecContext *avctx;

  350.     /* Frame header */

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

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

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

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

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

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

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

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

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

  360. 

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

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

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

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

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

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

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

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

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

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

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

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

  373.     int copy_history;           ///< copy history

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

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

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

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

  378. 

  379.     /* Primary audio coding header */

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

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

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

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

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

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

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

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

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

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

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

  391. 

  392.     /* Primary audio coding side information */

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

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

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

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

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

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

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

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

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

  402.     float downmix_coef[DCA_PRIM_CHANNELS_MAX][2];                ///< stereo downmix coefficients

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

  404. 

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

  406. 

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

  408.     int lfe_scale_factor;

  409. 

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

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

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

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

  414.     int hist_index[DCA_PRIM_CHANNELS_MAX];

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

  416. 

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

  418. 

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

  420.     float *samples_chanptr[DCA_PRIM_CHANNELS_MAX + 1];

  421.     float *extra_channels[DCA_PRIM_CHANNELS_MAX + 1];

  422.     uint8_t *extra_channels_buffer;

  423.     unsigned int extra_channels_buffer_size;

  424. 

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

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

  427. 

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

  429.     GetBitContext gb;

  430.     /* Current position in DCA frame */

  431.     int current_subframe;

  432.     int current_subsubframe;

  433. 

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

  435. 

  436.     /* XCh extension information */

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

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

  439. 

  440.     /* XXCH extension information */

  441.     int xxch_chset;

  442.     int xxch_nbits_spk_mask;

  443.     uint32_t xxch_core_spkmask;

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

  445.     int xxch_chset_nch[4];

  446.     float xxch_dmix_sf[DCA_CHSETS_MAX];

  447. 

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

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

  450. 

  451.     int8_t xxch_order_tab[32];

  452.     int8_t lfe_index;

  453. 

  454.     /* ExSS header parser */

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

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

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

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

  459. 

  460.     int profile;

  461. 

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

  463.     AVFloatDSPContext fdsp;

  464.     FFTContext imdct;

  465.     SynthFilterContext synth;

  466.     DCADSPContext dcadsp;

  467.     FmtConvertContext fmt_conv;

  468. } DCAContext;

  469. 

  470. static const uint16_t dca_vlc_offs[] = {

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

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

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

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

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

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

  477. };

  478. 

  479. static av_cold void dca_init_vlcs(void)

  480. {

  481.     static int vlcs_initialized = 0;

  482.     int i, j, c = 14;

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

  484. 

  485.     if (vlcs_initialized)

  486.         return;

  487. 

  488.     dca_bitalloc_index.offset = 1;

  489.     dca_bitalloc_index.wrap = 2;

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

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

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

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

  494.                  bitalloc_12_bits[i], 1, 1,

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

  496.     }

  497.     dca_scalefactor.offset = -64;

  498.     dca_scalefactor.wrap = 2;

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

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

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

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

  503.                  scales_bits[i], 1, 1,

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

  505.     }

  506.     dca_tmode.offset = 0;

  507.     dca_tmode.wrap = 1;

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

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

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

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

  512.                  tmode_bits[i], 1, 1,

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

  514.     }

  515. 

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

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

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

  519.                 break;

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

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

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

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

  524. 

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

  526.                      bitalloc_sizes[i],

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

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

  529.             c++;

  530.         }

  531.     vlcs_initialized = 1;

  532. }

  533. 

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

  535. {

  536.     while (len--)

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

  538. }

  539. 

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

  541. {

  542.     int i, base, mask;

  543. 

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

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

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

  547.         base += av_popcount(mask);

  548. 

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

  550. }

  551. 

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

  553.                                          int xxch)

  554. {

  555.     int i, j;

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

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

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

  559.     int hdr_pos = 0, hdr_size = 0;

  560.     float sign, mag, scale_factor;

  561.     int this_chans, acc_mask;

  562.     int embedded_downmix;

  563.     int nchans, mask[8];

  564.     int coeff, ichan;

  565. 

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

  567.     if (xxch) {

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

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

  570.     }

  571. 

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

  573.     s->total_channels = nchans + base_channel;

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

  575. 

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

  577.     if (xxch) {

  578.         acc_mask = s->xxch_core_spkmask;

  579. 

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

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

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

  583. 

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

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

  586. 

  587.         /* check for downmixing information */

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

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

  590.             scale_factor     =

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

  592. 

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

  594. 

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

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

  597.             }

  598. 

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

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

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

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

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

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

  605.                             av_log(s->avctx, AV_LOG_WARNING,

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

  607.                             continue;

  608.                         }

  609. 

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

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

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

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

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

  615.                     }

  616.                 }

  617.             }

  618.         }

  619.     }

  620. 

  621.     if (s->prim_channels > DCA_PRIM_CHANNELS_MAX)

  622.         s->prim_channels = DCA_PRIM_CHANNELS_MAX;

  623. 

  624. 

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

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

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

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

  629.     }

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

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

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

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

  634.     }

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

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

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

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

  639. 

  640.     /* Get codebooks quantization indexes */

  641.     if (!base_channel)

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

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

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

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

  646. 

  647.     /* Get scale factor adjustment */

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

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

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

  651. 

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

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

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

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

  656. 

  657.     if (!xxch) {

  658.         if (s->crc_present) {

  659.             /* Audio header CRC check */

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

  661.         }

  662.     } else {

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

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

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

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

  667.     }

  668. 

  669.     s->current_subframe    = 0;

  670.     s->current_subsubframe = 0;

  671. 

  672. #ifdef TRACE

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

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

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

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

  677.                s->subband_activity[i]);

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

  679.                s->vq_start_subband[i]);

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

  681.                s->joint_intensity[i]);

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

  683.                s->transient_huffman[i]);

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

  685.                s->scalefactor_huffman[i]);

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

  687.                s->bitalloc_huffman[i]);

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

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

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

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

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

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

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

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

  696.     }

  697. #endif

  698. 

  699.     return 0;

  700. }

  701. 

  702. static int dca_parse_frame_header(DCAContext *s)

  703. {

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

  705. 

  706.     /* Sync code */

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

  708. 

  709.     /* Frame header */

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

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

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

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

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

  715.     if (s->frame_size < 95)

  716.         return AVERROR_INVALIDDATA;

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

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

  719.     if (!s->sample_rate)

  720.         return AVERROR_INVALIDDATA;

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

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

  723.     if (!s->bit_rate)

  724.         return AVERROR_INVALIDDATA;

  725. 

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

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

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

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

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

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

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

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

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

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

  736. 

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

  738.         s->lfe = 0;

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

  740.         return AVERROR_INVALIDDATA;

  741.     }

  742. 

  743.     /* TODO: check CRC */

  744.     if (s->crc_present)

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

  746. 

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

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

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

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

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

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

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

  754. 

  755.     /* FIXME: channels mixing levels */

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

  757.     if (s->lfe)

  758.         s->output |= DCA_LFE;

  759. 

  760. #ifdef TRACE

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

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

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

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

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

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

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

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

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

  770.            s->sample_rate);

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

  772.            s->bit_rate);

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

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

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

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

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

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

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

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

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

  782.            s->predictor_history);

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

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

  785.            s->multirate_inter);

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

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

  788.     av_log(s->avctx, AV_LOG_DEBUG,

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

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

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

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

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

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

  795. #endif

  796. 

  797.     /* Primary audio coding header */

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

  799. 

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

  801. }

  802. 

  803. 

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

  805. {

  806.     if (level < 5) {

  807.         /* huffman encoded */

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

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

  810.     } else if (level < 8) {

  811.         if (level + 1 > log2range) {

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

  813.             value = get_bits(gb, log2range);

  814.         } else {

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

  816.         }

  817.     }

  818.     return value;

  819. }

  820. 

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

  822. {

  823.     /* Primary audio coding side information */

  824.     int j, k;

  825. 

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

  827.         return AVERROR_INVALIDDATA;

  828. 

  829.     if (!base_channel) {

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

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

  832.     }

  833. 

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

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

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

  837.     }

  838. 

  839.     /* Get prediction codebook */

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

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

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

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

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

  845.             }

  846.         }

  847.     }

  848. 

  849.     /* Bit allocation index */

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

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

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

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

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

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

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

  857.                 av_log(s->avctx, AV_LOG_ERROR,

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

  859.                 return AVERROR_INVALIDDATA;

  860.             } else {

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

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

  863.             }

  864. 

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

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

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

  868.                 return AVERROR_INVALIDDATA;

  869.             }

  870.         }

  871.     }

  872. 

  873.     /* Transition mode */

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

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

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

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

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

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

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

  881.             }

  882.         }

  883.     }

  884. 

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

  886.         return AVERROR_INVALIDDATA;

  887. 

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

  889.         const uint32_t *scale_table;

  890.         int scale_sum, log_size;

  891. 

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

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

  894. 

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

  896.             scale_table = scale_factor_quant7;

  897.             log_size = 7;

  898.         } else {

  899.             scale_table = scale_factor_quant6;

  900.             log_size = 6;

  901.         }

  902. 

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

  904.         scale_sum = 0;

  905. 

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

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

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

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

  910.             }

  911. 

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

  913.                 /* Get second scale factor */

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

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

  916.             }

  917.         }

  918.     }

  919. 

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

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

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

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

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

  925.     }

  926. 

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

  928.         return AVERROR_INVALIDDATA;

  929. 

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

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

  932.         int source_channel;

  933. 

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

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

  936.             int scale = 0;

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

  938. 

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

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

  941. 

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

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

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

  945.             }

  946. 

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

  948.                 av_log(s->avctx, AV_LOG_DEBUG,

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

  950.                 s->debug_flag |= 0x02;

  951.             }

  952.         }

  953.     }

  954. 

  955.     /* Stereo downmix coefficients */

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

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

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

  959.             av_log(s->avctx, AV_LOG_ERROR,

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

  961.             return AVERROR_INVALIDDATA;

  962.         }

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

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

  965.                                   s->prim_channels);

  966.             return AVERROR_PATCHWELCOME;

  967.         }

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

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

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

  971.         }

  972.     }

  973. 

  974.     /* Dynamic range coefficient */

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

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

  977. 

  978.     /* Side information CRC check word */

  979.     if (s->crc_present) {

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

  981.     }

  982. 

  983.     /*

  984.      * Primary audio data arrays

  985.      */

  986. 

  987.     /* VQ encoded high frequency subbands */

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

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

  990.             /* 1 vector -> 32 samples */

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

  992. 

  993.     /* Low frequency effect data */

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

  995.         int quant7;

  996.         /* LFE samples */

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

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

  999.         float lfe_scale;

  1000. 

  1001.         for (j = lfe_samples; j < lfe_end_sample; j++) {

  1002.             /* Signed 8 bits int */

  1003.             s->lfe_data[j] = get_sbits(&s->gb, 8);

  1004.         }

  1005. 

  1006.         /* Scale factor index */

  1007.         quant7 = get_bits(&s->gb, 8);

  1008.         if (quant7 > 127) {

  1009.             avpriv_request_sample(s->avctx, "LFEScaleIndex larger than 127");

  1010.             return AVERROR_INVALIDDATA;

  1011.         }

  1012.         s->lfe_scale_factor = scale_factor_quant7[quant7];

  1013. 

  1014.         /* Quantization step size * scale factor */

  1015.         lfe_scale = 0.035 * s->lfe_scale_factor;

  1016. 

  1017.         for (j = lfe_samples; j < lfe_end_sample; j++)

  1018.             s->lfe_data[j] *= lfe_scale;

  1019.     }

  1020. 

  1021. #ifdef TRACE

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

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

  1024.     av_log(s->avctx, AV_LOG_DEBUG, "partial samples: %i\n",

  1025.            s->partial_samples[s->current_subframe]);

  1026. 

  1027.     for (j = base_channel; j < s->prim_channels; j++) {

  1028.         av_log(s->avctx, AV_LOG_DEBUG, "prediction mode:");

  1029.         for (k = 0; k < s->subband_activity[j]; k++)

  1030.             av_log(s->avctx, AV_LOG_DEBUG, " %i", s->prediction_mode[j][k]);

  1031.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1032.     }

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

  1034.         for (k = 0; k < s->subband_activity[j]; k++)

  1035.             av_log(s->avctx, AV_LOG_DEBUG,

  1036.                    "prediction coefs: %f, %f, %f, %f\n",

  1037.                    (float) adpcm_vb[s->prediction_vq[j][k]][0] / 8192,

  1038.                    (float) adpcm_vb[s->prediction_vq[j][k]][1] / 8192,

  1039.                    (float) adpcm_vb[s->prediction_vq[j][k]][2] / 8192,

  1040.                    (float) adpcm_vb[s->prediction_vq[j][k]][3] / 8192);

  1041.     }

  1042.     for (j = base_channel; j < s->prim_channels; j++) {

  1043.         av_log(s->avctx, AV_LOG_DEBUG, "bitalloc index: ");

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

  1045.             av_log(s->avctx, AV_LOG_DEBUG, "%2.2i ", s->bitalloc[j][k]);

  1046.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1047.     }

  1048.     for (j = base_channel; j < s->prim_channels; j++) {

  1049.         av_log(s->avctx, AV_LOG_DEBUG, "Transition mode:");

  1050.         for (k = 0; k < s->subband_activity[j]; k++)

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

  1052.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1053.     }

  1054.     for (j = base_channel; j < s->prim_channels; j++) {

  1055.         av_log(s->avctx, AV_LOG_DEBUG, "Scale factor:");

  1056.         for (k = 0; k < s->subband_activity[j]; k++) {

  1057.             if (k >= s->vq_start_subband[j] || s->bitalloc[j][k] > 0)

  1058.                 av_log(s->avctx, AV_LOG_DEBUG, " %i", s->scale_factor[j][k][0]);

  1059.             if (k < s->vq_start_subband[j] && s->transition_mode[j][k])

  1060.                 av_log(s->avctx, AV_LOG_DEBUG, " %i(t)", s->scale_factor[j][k][1]);

  1061.         }

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

  1063.     }

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

  1065.         if (s->joint_intensity[j] > 0) {

  1066.             int source_channel = s->joint_intensity[j] - 1;

  1067.             av_log(s->avctx, AV_LOG_DEBUG, "Joint scale factor index:\n");

  1068.             for (k = s->subband_activity[j]; k < s->subband_activity[source_channel]; k++)

  1069.                 av_log(s->avctx, AV_LOG_DEBUG, " %i", s->joint_scale_factor[j][k]);

  1070.             av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1071.         }

  1072.     }

  1073.     if (!base_channel && s->prim_channels > 2) {

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

  1075.         for (j = 0; j < s->prim_channels; j++) {

  1076.             av_log(s->avctx, AV_LOG_DEBUG, "Channel 0, %d = %f\n", j,

  1077.                    s->downmix_coef[j][0]);

  1078.             av_log(s->avctx, AV_LOG_DEBUG, "Channel 1, %d = %f\n", j,

  1079.                    s->downmix_coef[j][1]);

  1080.         }

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

  1082.     }

  1083.     for (j = base_channel; j < s->prim_channels; j++)

  1084.         for (k = s->vq_start_subband[j]; k < s->subband_activity[j]; k++)

  1085.             av_log(s->avctx, AV_LOG_DEBUG, "VQ index: %i\n", s->high_freq_vq[j][k]);

  1086.     if (!base_channel && s->lfe) {

  1087.         int lfe_samples = 2 * s->lfe * (4 + block_index);

  1088.         int lfe_end_sample = 2 * s->lfe * (4 + block_index + s->subsubframes[s->current_subframe]);

  1089. 

  1090.         av_log(s->avctx, AV_LOG_DEBUG, "LFE samples:\n");

  1091.         for (j = lfe_samples; j < lfe_end_sample; j++)

  1092.             av_log(s->avctx, AV_LOG_DEBUG, " %f", s->lfe_data[j]);

  1093.         av_log(s->avctx, AV_LOG_DEBUG, "\n");

  1094.     }

  1095. #endif

  1096. 

  1097.     return 0;

  1098. }

  1099. 

  1100. static void qmf_32_subbands(DCAContext *s, int chans,

  1101.                             float samples_in[32][8], float *samples_out,

  1102.                             float scale)

  1103. {

  1104.     const float *prCoeff;

  1105. 

  1106.     int sb_act = s->subband_activity[chans];

  1107. 

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

  1109. 

  1110.     /* Select filter */

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

  1112.         prCoeff = fir_32bands_nonperfect;

  1113.     else                        /* Perfect reconstruction */

  1114.         prCoeff = fir_32bands_perfect;

  1115. 

  1116.     s->dcadsp.qmf_32_subbands(samples_in, sb_act, &s->synth, &s->imdct,

  1117.                               s->subband_fir_hist[chans],

  1118.                               &s->hist_index[chans],

  1119.                               s->subband_fir_noidea[chans], prCoeff,

  1120.                               samples_out, s->raXin, scale);

  1121. }

  1122. 

  1123. static void lfe_interpolation_fir(DCAContext *s, int decimation_select,

  1124.                                   int num_deci_sample, float *samples_in,

  1125.                                   float *samples_out, float scale)

  1126. {

  1127.     /* samples_in: An array holding decimated samples.

  1128.      *   Samples in current subframe starts from samples_in[0],

  1129.      *   while samples_in[-1], samples_in[-2], ..., stores samples

  1130.      *   from last subframe as history.

  1131.      *

  1132.      * samples_out: An array holding interpolated samples

  1133.      */

  1134. 

  1135.     int decifactor;

  1136.     const float *prCoeff;

  1137.     int deciindex;

  1138. 

  1139.     /* Select decimation filter */

  1140.     if (decimation_select == 1) {

  1141.         decifactor = 64;

  1142.         prCoeff = lfe_fir_128;

  1143.     } else {

  1144.         decifactor = 32;

  1145.         prCoeff = lfe_fir_64;

  1146.     }

  1147.     /* Interpolation */

  1148.     for (deciindex = 0; deciindex < num_deci_sample; deciindex++) {

  1149.         s->dcadsp.lfe_fir(samples_out, samples_in, prCoeff, decifactor, scale);

  1150.         samples_in++;

  1151.         samples_out += 2 * decifactor;

  1152.     }

  1153. }

  1154. 

  1155. /* downmixing routines */

  1156. #define MIX_REAR1(samples, s1, rs, coef)            \

  1157.     samples[0][i] += samples[s1][i] * coef[rs][0];  \

  1158.     samples[1][i] += samples[s1][i] * coef[rs][1];

  1159. 

  1160. #define MIX_REAR2(samples, s1, s2, rs, coef)                                          \

  1161.     samples[0][i] += samples[s1][i] * coef[rs][0] + samples[s2][i] * coef[rs + 1][0]; \

  1162.     samples[1][i] += samples[s1][i] * coef[rs][1] + samples[s2][i] * coef[rs + 1][1];

  1163. 

  1164. #define MIX_FRONT3(samples, coef)                                      \

  1165.     t = samples[c][i];                                                 \

  1166.     u = samples[l][i];                                                 \

  1167.     v = samples[r][i];                                                 \

  1168.     samples[0][i] = t * coef[0][0] + u * coef[1][0] + v * coef[2][0];  \

  1169.     samples[1][i] = t * coef[0][1] + u * coef[1][1] + v * coef[2][1];

  1170. 

  1171. #define DOWNMIX_TO_STEREO(op1, op2)             \

  1172.     for (i = 0; i < 256; i++) {                 \

  1173.         op1                                     \

  1174.         op2                                     \

  1175.     }

  1176. 

  1177. static void dca_downmix(float **samples, int srcfmt,

  1178.                         float coef[DCA_PRIM_CHANNELS_MAX][2],

  1179.                         const int8_t *channel_mapping)

  1180. {

  1181.     int c, l, r, sl, sr, s;

  1182.     int i;

  1183.     float t, u, v;

  1184. 

  1185.     switch (srcfmt) {

  1186.     case DCA_MONO:

  1187.     case DCA_CHANNEL:

  1188.     case DCA_STEREO_TOTAL:

  1189.     case DCA_STEREO_SUMDIFF:

  1190.     case DCA_4F2R:

  1191.         av_log(NULL, AV_LOG_ERROR, "Not implemented!\n");

  1192.         break;

  1193.     case DCA_STEREO:

  1194.         break;

  1195.     case DCA_3F:

  1196.         c = channel_mapping[0];

  1197.         l = channel_mapping[1];

  1198.         r = channel_mapping[2];

  1199.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef), );

  1200.         break;

  1201.     case DCA_2F1R:

  1202.         s = channel_mapping[2];

  1203.         DOWNMIX_TO_STEREO(MIX_REAR1(samples, s, 2, coef), );

  1204.         break;

  1205.     case DCA_3F1R:

  1206.         c = channel_mapping[0];

  1207.         l = channel_mapping[1];

  1208.         r = channel_mapping[2];

  1209.         s = channel_mapping[3];

  1210.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),

  1211.                           MIX_REAR1(samples, s, 3, coef));

  1212.         break;

  1213.     case DCA_2F2R:

  1214.         sl = channel_mapping[2];

  1215.         sr = channel_mapping[3];

  1216.         DOWNMIX_TO_STEREO(MIX_REAR2(samples, sl, sr, 2, coef), );

  1217.         break;

  1218.     case DCA_3F2R:

  1219.         c  = channel_mapping[0];

  1220.         l  = channel_mapping[1];

  1221.         r  = channel_mapping[2];

  1222.         sl = channel_mapping[3];

  1223.         sr = channel_mapping[4];

  1224.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),

  1225.                           MIX_REAR2(samples, sl, sr, 3, coef));

  1226.         break;

  1227.     }

  1228. }

  1229. 

  1230. 

  1231. #ifndef decode_blockcodes

  1232. /* Very compact version of the block code decoder that does not use table

  1233.  * look-up but is slightly slower */

  1234. static int decode_blockcode(int code, int levels, int32_t *values)

  1235. {

  1236.     int i;

  1237.     int offset = (levels - 1) >> 1;

  1238. 

  1239.     for (i = 0; i < 4; i++) {

  1240.         int div = FASTDIV(code, levels);

  1241.         values[i] = code - offset - div * levels;

  1242.         code = div;

  1243.     }

  1244. 

  1245.     return code;

  1246. }

  1247. 

  1248. static int decode_blockcodes(int code1, int code2, int levels, int32_t *values)

  1249. {

  1250.     return decode_blockcode(code1, levels, values) |

  1251.            decode_blockcode(code2, levels, values + 4);

  1252. }

  1253. #endif

  1254. 

  1255. static const uint8_t abits_sizes[7]  = { 7, 10, 12, 13, 15, 17, 19 };

  1256. static const uint8_t abits_levels[7] = { 3,  5,  7,  9, 13, 17, 25 };

  1257. 

  1258. #ifndef int8x8_fmul_int32

  1259. static inline void int8x8_fmul_int32(float *dst, const int8_t *src, int scale)

  1260. {

  1261.     float fscale = scale / 16.0;

  1262.     int i;

  1263.     for (i = 0; i < 8; i++)

  1264.         dst[i] = src[i] * fscale;

  1265. }

  1266. #endif

  1267. 

  1268. static int dca_subsubframe(DCAContext *s, int base_channel, int block_index)

  1269. {

  1270.     int k, l;

  1271.     int subsubframe = s->current_subsubframe;

  1272. 

  1273.     const float *quant_step_table;

  1274. 

  1275.     /* FIXME */

  1276.     float (*subband_samples)[DCA_SUBBANDS][8] = s->subband_samples[block_index];

  1277.     LOCAL_ALIGNED_16(int32_t, block, [8 * DCA_SUBBANDS]);

  1278. 

  1279.     /*

  1280.      * Audio data

  1281.      */

  1282. 

  1283.     /* Select quantization step size table */

  1284.     if (s->bit_rate_index == 0x1f)

  1285.         quant_step_table = lossless_quant_d;

  1286.     else

  1287.         quant_step_table = lossy_quant_d;

  1288. 

  1289.     for (k = base_channel; k < s->prim_channels; k++) {

  1290.         float rscale[DCA_SUBBANDS];

  1291. 

  1292.         if (get_bits_left(&s->gb) < 0)

  1293.             return AVERROR_INVALIDDATA;

  1294. 

  1295.         for (l = 0; l < s->vq_start_subband[k]; l++) {

  1296.             int m;

  1297. 

  1298.             /* Select the mid-tread linear quantizer */

  1299.             int abits = s->bitalloc[k][l];

  1300. 

  1301.             float quant_step_size = quant_step_table[abits];

  1302. 

  1303.             /*

  1304.              * Determine quantization index code book and its type

  1305.              */

  1306. 

  1307.             /* Select quantization index code book */

  1308.             int sel = s->quant_index_huffman[k][abits];

  1309. 

  1310.             /*

  1311.              * Extract bits from the bit stream

  1312.              */

  1313.             if (!abits) {

  1314.                 rscale[l] = 0;

  1315.                 memset(block + 8 * l, 0, 8 * sizeof(block[0]));

  1316.             } else {

  1317.                 /* Deal with transients */

  1318.                 int sfi = s->transition_mode[k][l] && subsubframe >= s->transition_mode[k][l];

  1319.                 rscale[l] = quant_step_size * s->scale_factor[k][l][sfi] *

  1320.                                s->scalefactor_adj[k][sel];

  1321. 

  1322.                 if (abits >= 11 || !dca_smpl_bitalloc[abits].vlc[sel].table) {

  1323.                     if (abits <= 7) {

  1324.                         /* Block code */

  1325.                         int block_code1, block_code2, size, levels, err;

  1326. 

  1327.                         size   = abits_sizes[abits - 1];

  1328.                         levels = abits_levels[abits - 1];

  1329. 

  1330.                         block_code1 = get_bits(&s->gb, size);

  1331.                         block_code2 = get_bits(&s->gb, size);

  1332.                         err = decode_blockcodes(block_code1, block_code2,

  1333.                                                 levels, block + 8 * l);

  1334.                         if (err) {

  1335.                             av_log(s->avctx, AV_LOG_ERROR,

  1336.                                    "ERROR: block code look-up failed\n");

  1337.                             return AVERROR_INVALIDDATA;

  1338.                         }

  1339.                     } else {

  1340.                         /* no coding */

  1341.                         for (m = 0; m < 8; m++)

  1342.                             block[8 * l + m] = get_sbits(&s->gb, abits - 3);

  1343.                     }

  1344.                 } else {

  1345.                     /* Huffman coded */

  1346.                     for (m = 0; m < 8; m++)

  1347.                         block[8 * l + m] = get_bitalloc(&s->gb,

  1348.                                                 &dca_smpl_bitalloc[abits], sel);

  1349.                 }

  1350. 

  1351.             }

  1352.         }

  1353. 

  1354.         s->fmt_conv.int32_to_float_fmul_array8(&s->fmt_conv, subband_samples[k][0],

  1355.                                                block, rscale, 8 * s->vq_start_subband[k]);

  1356. 

  1357.         for (l = 0; l < s->vq_start_subband[k]; l++) {

  1358.             int m;

  1359.             /*

  1360.              * Inverse ADPCM if in prediction mode

  1361.              */

  1362.             if (s->prediction_mode[k][l]) {

  1363.                 int n;

  1364.                 for (m = 0; m < 8; m++) {

  1365.                     for (n = 1; n <= 4; n++)

  1366.                         if (m >= n)

  1367.                             subband_samples[k][l][m] +=

  1368.                                 (adpcm_vb[s->prediction_vq[k][l]][n - 1] *

  1369.                                  subband_samples[k][l][m - n] / 8192);

  1370.                         else if (s->predictor_history)

  1371.                             subband_samples[k][l][m] +=

  1372.                                 (adpcm_vb[s->prediction_vq[k][l]][n - 1] *

  1373.                                  s->subband_samples_hist[k][l][m - n + 4] / 8192);

  1374.                 }

  1375.             }

  1376.         }

  1377. 

  1378.         /*

  1379.          * Decode VQ encoded high frequencies

  1380.          */

  1381.         for (l = s->vq_start_subband[k]; l < s->subband_activity[k]; l++) {

  1382.             /* 1 vector -> 32 samples but we only need the 8 samples

  1383.              * for this subsubframe. */

  1384.             int hfvq = s->high_freq_vq[k][l];

  1385. 

  1386.             if (!s->debug_flag & 0x01) {

  1387.                 av_log(s->avctx, AV_LOG_DEBUG,

  1388.                        "Stream with high frequencies VQ coding\n");

  1389.                 s->debug_flag |= 0x01;

  1390.             }

  1391. 

  1392.             int8x8_fmul_int32(subband_samples[k][l],

  1393.                               &high_freq_vq[hfvq][subsubframe * 8],

  1394.                               s->scale_factor[k][l][0]);

  1395.         }

  1396.     }

  1397. 

  1398.     /* Check for DSYNC after subsubframe */

  1399.     if (s->aspf || subsubframe == s->subsubframes[s->current_subframe] - 1) {

  1400.         if (0xFFFF == get_bits(&s->gb, 16)) {   /* 0xFFFF */

  1401. #ifdef TRACE

  1402.             av_log(s->avctx, AV_LOG_DEBUG, "Got subframe DSYNC\n");

  1403. #endif

  1404.         } else {

  1405.             av_log(s->avctx, AV_LOG_ERROR, "Didn't get subframe DSYNC\n");

  1406.             return AVERROR_INVALIDDATA;

  1407.         }

  1408.     }

  1409. 

  1410.     /* Backup predictor history for adpcm */

  1411.     for (k = base_channel; k < s->prim_channels; k++)

  1412.         for (l = 0; l < s->vq_start_subband[k]; l++)

  1413.             memcpy(s->subband_samples_hist[k][l],

  1414.                    &subband_samples[k][l][4],

  1415.                    4 * sizeof(subband_samples[0][0][0]));

  1416. 

  1417.     return 0;

  1418. }

  1419. 

  1420. static int dca_filter_channels(DCAContext *s, int block_index)

  1421. {

  1422.     float (*subband_samples)[DCA_SUBBANDS][8] = s->subband_samples[block_index];

  1423.     int k;

  1424. 

  1425.     /* 32 subbands QMF */

  1426.     for (k = 0; k < s->prim_channels; k++) {

  1427. /*        static float pcm_to_double[8] = { 32768.0, 32768.0, 524288.0, 524288.0,

  1428.                                             0, 8388608.0, 8388608.0 };*/

  1429.         if (s->channel_order_tab[k] >= 0)

  1430.             qmf_32_subbands(s, k, subband_samples[k],

  1431.                             s->samples_chanptr[s->channel_order_tab[k]],

  1432.                             M_SQRT1_2 / 32768.0 /* pcm_to_double[s->source_pcm_res] */);

  1433.     }

  1434. 

  1435.     /* Down mixing */

  1436.     if (s->prim_channels > 2 &&

  1437.         s->avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {

  1438.         dca_downmix(s->samples_chanptr, s->amode, s->downmix_coef, s->channel_order_tab);

  1439.     }

  1440. 

  1441.     /* Generate LFE samples for this subsubframe FIXME!!! */

  1442.     if (s->output & DCA_LFE) {

  1443.         lfe_interpolation_fir(s, s->lfe, 2 * s->lfe,

  1444.                               s->lfe_data + 2 * s->lfe * (block_index + 4),

  1445.                               s->samples_chanptr[s->lfe_index],

  1446.                               1.0 / (256.0 * 32768.0));

  1447.         /* Outputs 20bits pcm samples */

  1448.     }

  1449. 

  1450.     return 0;

  1451. }

  1452. 

  1453. 

  1454. static int dca_subframe_footer(DCAContext *s, int base_channel)

  1455. {

  1456.     int aux_data_count = 0, i;

  1457. 

  1458.     /*

  1459.      * Unpack optional information

  1460.      */

  1461. 

  1462.     /* presumably optional information only appears in the core? */

  1463.     if (!base_channel) {

  1464.         if (s->timestamp)

  1465.             skip_bits_long(&s->gb, 32);

  1466. 

  1467.         if (s->aux_data)

  1468.             aux_data_count = get_bits(&s->gb, 6);

  1469. 

  1470.         for (i = 0; i < aux_data_count; i++)

  1471.             get_bits(&s->gb, 8);

  1472. 

  1473.         if (s->crc_present && s->dynrange)

  1474.             get_bits(&s->gb, 16);

  1475.     }

  1476. 

  1477.     return 0;

  1478. }

  1479. 

  1480. /**

  1481.  * Decode a dca frame block

  1482.  *

  1483.  * @param s     pointer to the DCAContext

  1484.  */

  1485. 

  1486. static int dca_decode_block(DCAContext *s, int base_channel, int block_index)

  1487. {

  1488.     int ret;

  1489. 

  1490.     /* Sanity check */

  1491.     if (s->current_subframe >= s->subframes) {

  1492.         av_log(s->avctx, AV_LOG_DEBUG, "check failed: %i>%i",

  1493.                s->current_subframe, s->subframes);

  1494.         return AVERROR_INVALIDDATA;

  1495.     }

  1496. 

  1497.     if (!s->current_subsubframe) {

  1498. #ifdef TRACE

  1499.         av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subframe_header\n");

  1500. #endif

  1501.         /* Read subframe header */

  1502.         if ((ret = dca_subframe_header(s, base_channel, block_index)))

  1503.             return ret;

  1504.     }

  1505. 

  1506.     /* Read subsubframe */

  1507. #ifdef TRACE

  1508.     av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subsubframe\n");

  1509. #endif

  1510.     if ((ret = dca_subsubframe(s, base_channel, block_index)))

  1511.         return ret;

  1512. 

  1513.     /* Update state */

  1514.     s->current_subsubframe++;

  1515.     if (s->current_subsubframe >= s->subsubframes[s->current_subframe]) {

  1516.         s->current_subsubframe = 0;

  1517.         s->current_subframe++;

  1518.     }

  1519.     if (s->current_subframe >= s->subframes) {

  1520. #ifdef TRACE

  1521.         av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subframe_footer\n");

  1522. #endif

  1523.         /* Read subframe footer */

  1524.         if ((ret = dca_subframe_footer(s, base_channel)))

  1525.             return ret;

  1526.     }

  1527. 

  1528.     return 0;

  1529. }

  1530. 

  1531. /**

  1532.  * Return the number of channels in an ExSS speaker mask (HD)

  1533.  */

  1534. static int dca_exss_mask2count(int mask)

  1535. {

  1536.     /* count bits that mean speaker pairs twice */

  1537.     return av_popcount(mask) +

  1538.            av_popcount(mask & (DCA_EXSS_CENTER_LEFT_RIGHT      |

  1539.                                DCA_EXSS_FRONT_LEFT_RIGHT       |

  1540.                                DCA_EXSS_FRONT_HIGH_LEFT_RIGHT  |

  1541.                                DCA_EXSS_WIDE_LEFT_RIGHT        |

  1542.                                DCA_EXSS_SIDE_LEFT_RIGHT        |

  1543.                                DCA_EXSS_SIDE_HIGH_LEFT_RIGHT   |

  1544.                                DCA_EXSS_SIDE_REAR_LEFT_RIGHT   |

  1545.                                DCA_EXSS_REAR_LEFT_RIGHT        |

  1546.                                DCA_EXSS_REAR_HIGH_LEFT_RIGHT));

  1547. }

  1548. 

  1549. /**

  1550.  * Skip mixing coefficients of a single mix out configuration (HD)

  1551.  */

  1552. static void dca_exss_skip_mix_coeffs(GetBitContext *gb, int channels, int out_ch)

  1553. {

  1554.     int i;

  1555. 

  1556.     for (i = 0; i < channels; i++) {

  1557.         int mix_map_mask = get_bits(gb, out_ch);

  1558.         int num_coeffs = av_popcount(mix_map_mask);

  1559.         skip_bits_long(gb, num_coeffs * 6);

  1560.     }

  1561. }

  1562. 

  1563. /**

  1564.  * Parse extension substream asset header (HD)

  1565.  */

  1566. static int dca_exss_parse_asset_header(DCAContext *s)

  1567. {

  1568.     int header_pos = get_bits_count(&s->gb);

  1569.     int header_size;

  1570.     int channels = 0;

  1571.     int embedded_stereo = 0;

  1572.     int embedded_6ch    = 0;

  1573.     int drc_code_present;

  1574.     int av_uninit(extensions_mask);

  1575.     int i, j;

  1576. 

  1577.     if (get_bits_left(&s->gb) < 16)

  1578.         return -1;

  1579. 

  1580.     /* We will parse just enough to get to the extensions bitmask with which

  1581.      * we can set the profile value. */

  1582. 

  1583.     header_size = get_bits(&s->gb, 9) + 1;

  1584.     skip_bits(&s->gb, 3); // asset index

  1585. 

  1586.     if (s->static_fields) {

  1587.         if (get_bits1(&s->gb))

  1588.             skip_bits(&s->gb, 4); // asset type descriptor

  1589.         if (get_bits1(&s->gb))

  1590.             skip_bits_long(&s->gb, 24); // language descriptor

  1591. 

  1592.         if (get_bits1(&s->gb)) {

  1593.             /* How can one fit 1024 bytes of text here if the maximum value

  1594.              * for the asset header size field above was 512 bytes? */

  1595.             int text_length = get_bits(&s->gb, 10) + 1;

  1596.             if (get_bits_left(&s->gb) < text_length * 8)

  1597.                 return -1;

  1598.             skip_bits_long(&s->gb, text_length * 8); // info text

  1599.         }

  1600. 

  1601.         skip_bits(&s->gb, 5); // bit resolution - 1

  1602.         skip_bits(&s->gb, 4); // max sample rate code

  1603.         channels = get_bits(&s->gb, 8) + 1;

  1604. 

  1605.         if (get_bits1(&s->gb)) { // 1-to-1 channels to speakers

  1606.             int spkr_remap_sets;

  1607.             int spkr_mask_size = 16;

  1608.             int num_spkrs[7];

  1609. 

  1610.             if (channels > 2)

  1611.                 embedded_stereo = get_bits1(&s->gb);

  1612.             if (channels > 6)

  1613.                 embedded_6ch = get_bits1(&s->gb);

  1614. 

  1615.             if (get_bits1(&s->gb)) {

  1616.                 spkr_mask_size = (get_bits(&s->gb, 2) + 1) << 2;

  1617.                 skip_bits(&s->gb, spkr_mask_size); // spkr activity mask

  1618.             }

  1619. 

  1620.             spkr_remap_sets = get_bits(&s->gb, 3);

  1621. 

  1622.             for (i = 0; i < spkr_remap_sets; i++) {

  1623.                 /* std layout mask for each remap set */

  1624.                 num_spkrs[i] = dca_exss_mask2count(get_bits(&s->gb, spkr_mask_size));

  1625.             }

  1626. 

  1627.             for (i = 0; i < spkr_remap_sets; i++) {

  1628.                 int num_dec_ch_remaps = get_bits(&s->gb, 5) + 1;

  1629.                 if (get_bits_left(&s->gb) < 0)

  1630.                     return -1;

  1631. 

  1632.                 for (j = 0; j < num_spkrs[i]; j++) {

  1633.                     int remap_dec_ch_mask = get_bits_long(&s->gb, num_dec_ch_remaps);

  1634.                     int num_dec_ch = av_popcount(remap_dec_ch_mask);

  1635.                     skip_bits_long(&s->gb, num_dec_ch * 5); // remap codes

  1636.                 }

  1637.             }

  1638. 

  1639.         } else {

  1640.             skip_bits(&s->gb, 3); // representation type

  1641.         }

  1642.     }

  1643. 

  1644.     drc_code_present = get_bits1(&s->gb);

  1645.     if (drc_code_present)

  1646.         get_bits(&s->gb, 8); // drc code

  1647. 

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

  1649.         skip_bits(&s->gb, 5); // dialog normalization code

  1650. 

  1651.     if (drc_code_present && embedded_stereo)

  1652.         get_bits(&s->gb, 8); // drc stereo code

  1653. 

  1654.     if (s->mix_metadata && get_bits1(&s->gb)) {

  1655.         skip_bits(&s->gb, 1); // external mix

  1656.         skip_bits(&s->gb, 6); // post mix gain code

  1657. 

  1658.         if (get_bits(&s->gb, 2) != 3) // mixer drc code

  1659.             skip_bits(&s->gb, 3); // drc limit

  1660.         else

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

  1662. 

  1663.         if (get_bits1(&s->gb)) // channel specific scaling

  1664.             for (i = 0; i < s->num_mix_configs; i++)

  1665.                 skip_bits_long(&s->gb, s->mix_config_num_ch[i] * 6); // scale codes

  1666.         else

  1667.             skip_bits_long(&s->gb, s->num_mix_configs * 6); // scale codes

  1668. 

  1669.         for (i = 0; i < s->num_mix_configs; i++) {

  1670.             if (get_bits_left(&s->gb) < 0)

  1671.                 return -1;

  1672.             dca_exss_skip_mix_coeffs(&s->gb, channels, s->mix_config_num_ch[i]);

  1673.             if (embedded_6ch)

  1674.                 dca_exss_skip_mix_coeffs(&s->gb, 6, s->mix_config_num_ch[i]);

  1675.             if (embedded_stereo)

  1676.                 dca_exss_skip_mix_coeffs(&s->gb, 2, s->mix_config_num_ch[i]);

  1677.         }

  1678.     }

  1679. 

  1680.     switch (get_bits(&s->gb, 2)) {

  1681.     case 0: extensions_mask = get_bits(&s->gb, 12); break;

  1682.     case 1: extensions_mask = DCA_EXT_EXSS_XLL;     break;

  1683.     case 2: extensions_mask = DCA_EXT_EXSS_LBR;     break;

  1684.     case 3: extensions_mask = 0; /* aux coding */   break;

  1685.     }

  1686. 

  1687.     /* not parsed further, we were only interested in the extensions mask */

  1688. 

  1689.     if (get_bits_left(&s->gb) < 0)

  1690.         return -1;

  1691. 

  1692.     if (get_bits_count(&s->gb) - header_pos > header_size * 8) {

  1693.         av_log(s->avctx, AV_LOG_WARNING, "Asset header size mismatch.\n");

  1694.         return -1;

  1695.     }

  1696.     skip_bits_long(&s->gb, header_pos + header_size * 8 - get_bits_count(&s->gb));

  1697. 

  1698.     if (extensions_mask & DCA_EXT_EXSS_XLL)

  1699.         s->profile = FF_PROFILE_DTS_HD_MA;

  1700.     else if (extensions_mask & (DCA_EXT_EXSS_XBR | DCA_EXT_EXSS_X96 |

  1701.                                 DCA_EXT_EXSS_XXCH))

  1702.         s->profile = FF_PROFILE_DTS_HD_HRA;

  1703. 

  1704.     if (!(extensions_mask & DCA_EXT_CORE))

  1705.         av_log(s->avctx, AV_LOG_WARNING, "DTS core detection mismatch.\n");

  1706.     if ((extensions_mask & DCA_CORE_EXTS) != s->core_ext_mask)

  1707.         av_log(s->avctx, AV_LOG_WARNING,

  1708.                "DTS extensions detection mismatch (%d, %d)\n",

  1709.                extensions_mask & DCA_CORE_EXTS, s->core_ext_mask);

  1710. 

  1711.     return 0;

  1712. }

  1713. 

  1714. static int dca_xbr_parse_frame(DCAContext *s)

  1715. {

  1716.     int scale_table_high[DCA_CHSET_CHANS_MAX][DCA_SUBBANDS][2];

  1717.     int active_bands[DCA_CHSETS_MAX][DCA_CHSET_CHANS_MAX];

  1718.     int abits_high[DCA_CHSET_CHANS_MAX][DCA_SUBBANDS];

  1719.     int anctemp[DCA_CHSET_CHANS_MAX];

  1720.     int chset_fsize[DCA_CHSETS_MAX];

  1721.     int n_xbr_ch[DCA_CHSETS_MAX];

  1722.     int hdr_size, num_chsets, xbr_tmode, hdr_pos;

  1723.     int i, j, k, l, chset, chan_base;

  1724. 

  1725.     av_log(s->avctx, AV_LOG_DEBUG, "DTS-XBR: decoding XBR extension\n");

  1726. 

  1727.     /* get bit position of sync header */

  1728.     hdr_pos = get_bits_count(&s->gb) - 32;

  1729. 

  1730.     hdr_size = get_bits(&s->gb, 6) + 1;

  1731.     num_chsets = get_bits(&s->gb, 2) + 1;

  1732. 

  1733.     for(i = 0; i < num_chsets; i++)

  1734.         chset_fsize[i] = get_bits(&s->gb, 14) + 1;

  1735. 

  1736.     xbr_tmode = get_bits1(&s->gb);

  1737. 

  1738.     for(i = 0; i < num_chsets; i++) {

  1739.         n_xbr_ch[i] = get_bits(&s->gb, 3) + 1;

  1740.         k = get_bits(&s->gb, 2) + 5;

  1741.         for(j = 0; j < n_xbr_ch[i]; j++)

  1742.             active_bands[i][j] = get_bits(&s->gb, k) + 1;

  1743.     }

  1744. 

  1745.     /* skip to the end of the header */

  1746.     i = get_bits_count(&s->gb);

  1747.     if(hdr_pos + hdr_size * 8 > i)

  1748.         skip_bits_long(&s->gb, hdr_pos + hdr_size * 8 - i);

  1749. 

  1750.     /* loop over the channel data sets */

  1751.     /* only decode as many channels as we've decoded base data for */

  1752.     for(chset = 0, chan_base = 0;

  1753.         chset < num_chsets && chan_base + n_xbr_ch[chset] <= s->prim_channels;

  1754.         chan_base += n_xbr_ch[chset++]) {

  1755.         int start_posn = get_bits_count(&s->gb);

  1756.         int subsubframe = 0;

  1757.         int subframe = 0;

  1758. 

  1759.         /* loop over subframes */

  1760.         for (k = 0; k < (s->sample_blocks / 8); k++) {

  1761.             /* parse header if we're on first subsubframe of a block */

  1762.             if(subsubframe == 0) {

  1763.                 /* Parse subframe header */

  1764.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1765.                     anctemp[i] = get_bits(&s->gb, 2) + 2;

  1766.                 }

  1767. 

  1768.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1769.                     get_array(&s->gb, abits_high[i], active_bands[chset][i], anctemp[i]);

  1770.                 }

  1771. 

  1772.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1773.                     anctemp[i] = get_bits(&s->gb, 3);

  1774.                     if(anctemp[i] < 1) {

  1775.                         av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: SYNC ERROR\n");

  1776.                         return AVERROR_INVALIDDATA;

  1777.                     }

  1778.                 }

  1779. 

  1780.                 /* generate scale factors */

  1781.                 for(i = 0; i < n_xbr_ch[chset]; i++) {

  1782.                     const uint32_t *scale_table;

  1783.                     int nbits;

  1784. 

  1785.                     if (s->scalefactor_huffman[chan_base+i] == 6) {

  1786.                         scale_table = scale_factor_quant7;

  1787.                     } else {

  1788.                         scale_table = scale_factor_quant6;

  1789.                     }

  1790. 

  1791.                     nbits = anctemp[i];

  1792. 

  1793.                     for(j = 0; j < active_bands[chset][i]; j++) {

  1794.                         if(abits_high[i][j] > 0) {

  1795.                             scale_table_high[i][j][0] =

  1796.                                 scale_table[get_bits(&s->gb, nbits)];

  1797. 

  1798.                             if(xbr_tmode && s->transition_mode[i][j]) {

  1799.                                 scale_table_high[i][j][1] =

  1800.                                     scale_table[get_bits(&s->gb, nbits)];

  1801.                             }

  1802.                         }

  1803.                     }

  1804.                 }

  1805.             }

  1806. 

  1807.             /* decode audio array for this block */

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

  1809.                 for(j = 0; j < active_bands[chset][i]; j++) {

  1810.                     const int xbr_abits = abits_high[i][j];

  1811.                     const float quant_step_size = lossless_quant_d[xbr_abits];

  1812.                     const int sfi = xbr_tmode && s->transition_mode[i][j] && subsubframe >= s->transition_mode[i][j];

  1813.                     const float rscale = quant_step_size * scale_table_high[i][j][sfi];

  1814.                     float *subband_samples = s->subband_samples[k][chan_base+i][j];

  1815.                     int block[8];

  1816. 

  1817.                     if(xbr_abits <= 0)

  1818.                         continue;

  1819. 

  1820.                     if(xbr_abits > 7) {

  1821.                         get_array(&s->gb, block, 8, xbr_abits - 3);

  1822.                     } else {

  1823.                         int block_code1, block_code2, size, levels, err;

  1824. 

  1825.                         size   = abits_sizes[xbr_abits - 1];

  1826.                         levels = abits_levels[xbr_abits - 1];

  1827. 

  1828.                         block_code1 = get_bits(&s->gb, size);

  1829.                         block_code2 = get_bits(&s->gb, size);

  1830.                         err = decode_blockcodes(block_code1, block_code2,

  1831.                                                 levels, block);

  1832.                         if (err) {

  1833.                             av_log(s->avctx, AV_LOG_ERROR,

  1834.                                    "ERROR: DTS-XBR: block code look-up failed\n");

  1835.                             return AVERROR_INVALIDDATA;

  1836.                         }

  1837.                     }

  1838. 

  1839.                     /* scale & sum into subband */

  1840.                     for(l = 0; l < 8; l++)

  1841.                         subband_samples[l] += (float)block[l] * rscale;

  1842.                 }

  1843.             }

  1844. 

  1845.             /* check DSYNC marker */

  1846.             if(s->aspf || subsubframe == s->subsubframes[subframe] - 1) {

  1847.                 if(get_bits(&s->gb, 16) != 0xffff) {

  1848.                     av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: Didn't get subframe DSYNC\n");

  1849.                     return AVERROR_INVALIDDATA;

  1850.                 }

  1851.             }

  1852. 

  1853.             /* advance sub-sub-frame index */

  1854.             if(++subsubframe >= s->subsubframes[subframe]) {

  1855.                 subsubframe = 0;

  1856.                 subframe++;

  1857.             }

  1858.         }

  1859. 

  1860.         /* skip to next channel set */

  1861.         i = get_bits_count(&s->gb);

  1862.         if(start_posn + chset_fsize[chset] * 8 != i) {

  1863.             j = start_posn + chset_fsize[chset] * 8 - i;

  1864.             if(j < 0 || j >= 8)

  1865.                 av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: end of channel set,"

  1866.                        " skipping further than expected (%d bits)\n", j);

  1867.             skip_bits_long(&s->gb, j);

  1868.         }

  1869.     }

  1870. 

  1871.     return 0;

  1872. }

  1873. 

  1874. /* parse initial header for XXCH and dump details */

  1875. static int dca_xxch_decode_frame(DCAContext *s)

  1876. {

  1877.     int hdr_size, spkmsk_bits, num_chsets, core_spk, hdr_pos;

  1878.     int i, chset, base_channel, chstart, fsize[8];

  1879. 

  1880.     /* assume header word has already been parsed */

  1881.     hdr_pos     = get_bits_count(&s->gb) - 32;

  1882.     hdr_size    = get_bits(&s->gb, 6) + 1;

  1883.   /*chhdr_crc   =*/ skip_bits1(&s->gb);

  1884.     spkmsk_bits = get_bits(&s->gb, 5) + 1;

  1885.     num_chsets  = get_bits(&s->gb, 2) + 1;

  1886. 

  1887.     for (i = 0; i < num_chsets; i++)

  1888.         fsize[i] = get_bits(&s->gb, 14) + 1;

  1889. 

  1890.     core_spk               = get_bits(&s->gb, spkmsk_bits);

  1891.     s->xxch_core_spkmask   = core_spk;

  1892.     s->xxch_nbits_spk_mask = spkmsk_bits;

  1893.     s->xxch_dmix_embedded  = 0;

  1894. 

  1895.     /* skip to the end of the header */

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

  1897.     if (hdr_pos + hdr_size * 8 > i)

  1898.         skip_bits_long(&s->gb, hdr_pos + hdr_size * 8 - i);

  1899. 

  1900.     for (chset = 0; chset < num_chsets; chset++) {

  1901.         chstart       = get_bits_count(&s->gb);

  1902.         base_channel  = s->prim_channels;

  1903.         s->xxch_chset = chset;

  1904. 

  1905.         /* XXCH and Core headers differ, see 6.4.2 "XXCH Channel Set Header" vs.

  1906.            5.3.2 "Primary Audio Coding Header", DTS Spec 1.3.1 */

  1907.         dca_parse_audio_coding_header(s, base_channel, 1);

  1908. 

  1909.         /* decode channel data */

  1910.         for (i = 0; i < (s->sample_blocks / 8); i++) {

  1911.             if (dca_decode_block(s, base_channel, i)) {

  1912.                 av_log(s->avctx, AV_LOG_ERROR,

  1913.                        "Error decoding DTS-XXCH extension\n");

  1914.                 continue;

  1915.             }

  1916.         }

  1917. 

  1918.         /* skip to end of this section */

  1919.         i = get_bits_count(&s->gb);

  1920.         if (chstart + fsize[chset] * 8 > i)

  1921.             skip_bits_long(&s->gb, chstart + fsize[chset] * 8 - i);

  1922.     }

  1923.     s->xxch_chset = num_chsets;

  1924. 

  1925.     return 0;

  1926. }

  1927. 

  1928. /**

  1929.  * Parse extension substream header (HD)

  1930.  */

  1931. static void dca_exss_parse_header(DCAContext *s)

  1932. {

  1933.     int asset_size[8];

  1934.     int ss_index;

  1935.     int blownup;

  1936.     int num_audiop = 1;

  1937.     int num_assets = 1;

  1938.     int active_ss_mask[8];

  1939.     int i, j;

  1940.     int start_posn;

  1941.     int hdrsize;

  1942.     uint32_t mkr;

  1943. 

  1944.     if (get_bits_left(&s->gb) < 52)

  1945.         return;

  1946. 

  1947.     start_posn = get_bits_count(&s->gb) - 32;

  1948. 

  1949.     skip_bits(&s->gb, 8); // user data

  1950.     ss_index = get_bits(&s->gb, 2);

  1951. 

  1952.     blownup = get_bits1(&s->gb);

  1953.     hdrsize = get_bits(&s->gb,  8 + 4 * blownup) + 1; // header_size

  1954.     skip_bits(&s->gb, 16 + 4 * blownup); // hd_size

  1955. 

  1956.     s->static_fields = get_bits1(&s->gb);

  1957.     if (s->static_fields) {

  1958.         skip_bits(&s->gb, 2); // reference clock code

  1959.         skip_bits(&s->gb, 3); // frame duration code

  1960. 

  1961.         if (get_bits1(&s->gb))

  1962.             skip_bits_long(&s->gb, 36); // timestamp

  1963. 

  1964.         /* a single stream can contain multiple audio assets that can be

  1965.          * combined to form multiple audio presentations */

  1966. 

  1967.         num_audiop = get_bits(&s->gb, 3) + 1;

  1968.         if (num_audiop > 1) {

  1969.             avpriv_request_sample(s->avctx,

  1970.                                   "Multiple DTS-HD audio presentations");

  1971.             /* ignore such streams for now */

  1972.             return;

  1973.         }

  1974. 

  1975.         num_assets = get_bits(&s->gb, 3) + 1;

  1976.         if (num_assets > 1) {

  1977.             avpriv_request_sample(s->avctx, "Multiple DTS-HD audio assets");

  1978.             /* ignore such streams for now */

  1979.             return;

  1980.         }

  1981. 

  1982.         for (i = 0; i < num_audiop; i++)

  1983.             active_ss_mask[i] = get_bits(&s->gb, ss_index + 1);

  1984. 

  1985.         for (i = 0; i < num_audiop; i++)

  1986.             for (j = 0; j <= ss_index; j++)

  1987.                 if (active_ss_mask[i] & (1 << j))

  1988.                     skip_bits(&s->gb, 8); // active asset mask

  1989. 

  1990.         s->mix_metadata = get_bits1(&s->gb);

  1991.         if (s->mix_metadata) {

  1992.             int mix_out_mask_size;

  1993. 

  1994.             skip_bits(&s->gb, 2); // adjustment level

  1995.             mix_out_mask_size  = (get_bits(&s->gb, 2) + 1) << 2;

  1996.             s->num_mix_configs =  get_bits(&s->gb, 2) + 1;

  1997. 

  1998.             for (i = 0; i < s->num_mix_configs; i++) {

  1999.                 int mix_out_mask        = get_bits(&s->gb, mix_out_mask_size);

  2000.                 s->mix_config_num_ch[i] = dca_exss_mask2count(mix_out_mask);

  2001.             }

  2002.         }

  2003.     }

  2004. 

  2005.     for (i = 0; i < num_assets; i++)

  2006.         asset_size[i] = get_bits_long(&s->gb, 16 + 4 * blownup);

  2007. 

  2008.     for (i = 0; i < num_assets; i++) {

  2009.         if (dca_exss_parse_asset_header(s))

  2010.             return;

  2011.     }

  2012. 

  2013.     /* not parsed further, we were only interested in the extensions mask

  2014.      * from the asset header */

  2015. 

  2016.     if (num_assets > 0) {

  2017.         j = get_bits_count(&s->gb);

  2018.         if (start_posn + hdrsize * 8 > j)

  2019.             skip_bits_long(&s->gb, start_posn + hdrsize * 8 - j);

  2020. 

  2021.         for (i = 0; i < num_assets; i++) {

  2022.             start_posn = get_bits_count(&s->gb);

  2023.             mkr        = get_bits_long(&s->gb, 32);

  2024. 

  2025.             /* parse extensions that we know about */

  2026.             if (mkr == 0x655e315e) {

  2027.                 dca_xbr_parse_frame(s);

  2028.             } else if (mkr == 0x47004a03) {

  2029.                 dca_xxch_decode_frame(s);

  2030.                 s->core_ext_mask |= DCA_EXT_XXCH; /* xxx use for chan reordering */

  2031.             } else {

  2032.                 av_log(s->avctx, AV_LOG_DEBUG,

  2033.                        "DTS-ExSS: unknown marker = 0x%08x\n", mkr);

  2034.             }

  2035. 

  2036.             /* skip to end of block */

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

  2038.             if (start_posn + asset_size[i] * 8 > j)

  2039.                 skip_bits_long(&s->gb, start_posn + asset_size[i] * 8 - j);

  2040.         }

  2041.     }

  2042. }

  2043. 

  2044. /**

  2045.  * Main frame decoding function

  2046.  * FIXME add arguments

  2047.  */

  2048. static int dca_decode_frame(AVCodecContext *avctx, void *data,

  2049.                             int *got_frame_ptr, AVPacket *avpkt)

  2050. {

  2051.     AVFrame *frame     = data;

  2052.     const uint8_t *buf = avpkt->data;

  2053.     int buf_size = avpkt->size;

  2054.     int channel_mask;

  2055.     int channel_layout;

  2056.     int lfe_samples;

  2057.     int num_core_channels = 0;

  2058.     int i, ret;

  2059.     float **samples_flt;

  2060.     float *src_chan;

  2061.     float *dst_chan;

  2062.     DCAContext *s = avctx->priv_data;

  2063.     int core_ss_end;

  2064.     int channels, full_channels;

  2065.     float scale;

  2066.     int achan;

  2067.     int chset;

  2068.     int mask;

  2069.     int lavc;

  2070.     int posn;

  2071.     int j, k;

  2072.     int endch;

  2073. 

  2074.     s->xch_present = 0;

  2075. 

  2076.     s->dca_buffer_size = ff_dca_convert_bitstream(buf, buf_size, s->dca_buffer,

  2077.                                                   DCA_MAX_FRAME_SIZE + DCA_MAX_EXSS_HEADER_SIZE);

  2078.     if (s->dca_buffer_size == AVERROR_INVALIDDATA) {

  2079.         av_log(avctx, AV_LOG_ERROR, "Not a valid DCA frame\n");

  2080.         return AVERROR_INVALIDDATA;

  2081.     }

  2082. 

  2083.     init_get_bits(&s->gb, s->dca_buffer, s->dca_buffer_size * 8);

  2084.     if ((ret = dca_parse_frame_header(s)) < 0) {

  2085.         //seems like the frame is corrupt, try with the next one

  2086.         return ret;

  2087.     }

  2088.     //set AVCodec values with parsed data

  2089.     avctx->sample_rate = s->sample_rate;

  2090.     avctx->bit_rate    = s->bit_rate;

  2091. 

  2092.     s->profile = FF_PROFILE_DTS;

  2093. 

  2094.     for (i = 0; i < (s->sample_blocks / 8); i++) {

  2095.         if ((ret = dca_decode_block(s, 0, i))) {

  2096.             av_log(avctx, AV_LOG_ERROR, "error decoding block\n");

  2097.             return ret;

  2098.         }

  2099.     }

  2100. 

  2101.     /* record number of core channels incase less than max channels are requested */

  2102.     num_core_channels = s->prim_channels;

  2103. 

  2104.     if (s->ext_coding)

  2105.         s->core_ext_mask = dca_ext_audio_descr_mask[s->ext_descr];

  2106.     else

  2107.         s->core_ext_mask = 0;

  2108. 

  2109.     core_ss_end = FFMIN(s->frame_size, s->dca_buffer_size) * 8;

  2110. 

  2111.     /* only scan for extensions if ext_descr was unknown or indicated a

  2112.      * supported XCh extension */

  2113.     if (s->core_ext_mask < 0 || s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH)) {

  2114. 

  2115.         /* if ext_descr was unknown, clear s->core_ext_mask so that the

  2116.          * extensions scan can fill it up */

  2117.         s->core_ext_mask = FFMAX(s->core_ext_mask, 0);

  2118. 

  2119.         /* extensions start at 32-bit boundaries into bitstream */

  2120.         skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);

  2121. 

  2122.         while (core_ss_end - get_bits_count(&s->gb) >= 32) {

  2123.             uint32_t bits = get_bits_long(&s->gb, 32);

  2124. 

  2125.             switch (bits) {

  2126.             case 0x5a5a5a5a: {

  2127.                 int ext_amode, xch_fsize;

  2128. 

  2129.                 s->xch_base_channel = s->prim_channels;

  2130. 

  2131.                 /* validate sync word using XCHFSIZE field */

  2132.                 xch_fsize = show_bits(&s->gb, 10);

  2133.                 if ((s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize) &&

  2134.                     (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize + 1))

  2135.                     continue;

  2136. 

  2137.                 /* skip length-to-end-of-frame field for the moment */

  2138.                 skip_bits(&s->gb, 10);

  2139. 

  2140.                 s->core_ext_mask |= DCA_EXT_XCH;

  2141. 

  2142.                 /* extension amode(number of channels in extension) should be 1 */

  2143.                 /* AFAIK XCh is not used for more channels */

  2144.                 if ((ext_amode = get_bits(&s->gb, 4)) != 1) {

  2145.                     av_log(avctx, AV_LOG_ERROR, "XCh extension amode %d not"

  2146.                            " supported!\n", ext_amode);

  2147.                     continue;

  2148.                 }

  2149. 

  2150.                 if (s->xch_base_channel < 2) {

  2151.                     avpriv_request_sample(avctx, "XCh with fewer than 2 base channels");

  2152.                     continue;

  2153.                 }

  2154. 

  2155.                 /* much like core primary audio coding header */

  2156.                 dca_parse_audio_coding_header(s, s->xch_base_channel, 0);

  2157. 

  2158.                 for (i = 0; i < (s->sample_blocks / 8); i++)

  2159.                     if ((ret = dca_decode_block(s, s->xch_base_channel, i))) {

  2160.                         av_log(avctx, AV_LOG_ERROR, "error decoding XCh extension\n");

  2161.                         continue;

  2162.                     }

  2163. 

  2164.                 s->xch_present = 1;

  2165.                 break;

  2166.             }

  2167.             case 0x47004a03:

  2168.                 /* XXCh: extended channels */

  2169.                 /* usually found either in core or HD part in DTS-HD HRA streams,

  2170.                  * but not in DTS-ES which contains XCh extensions instead */

  2171.                 s->core_ext_mask |= DCA_EXT_XXCH;

  2172.                 dca_xxch_decode_frame(s);

  2173.                 break;

  2174. 

  2175.             case 0x1d95f262: {

  2176.                 int fsize96 = show_bits(&s->gb, 12) + 1;

  2177.                 if (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + fsize96)

  2178.                     continue;

  2179. 

  2180.                 av_log(avctx, AV_LOG_DEBUG, "X96 extension found at %d bits\n",

  2181.                        get_bits_count(&s->gb));

  2182.                 skip_bits(&s->gb, 12);

  2183.                 av_log(avctx, AV_LOG_DEBUG, "FSIZE96 = %d bytes\n", fsize96);

  2184.                 av_log(avctx, AV_LOG_DEBUG, "REVNO = %d\n", get_bits(&s->gb, 4));

  2185. 

  2186.                 s->core_ext_mask |= DCA_EXT_X96;

  2187.                 break;

  2188.             }

  2189.             }

  2190. 

  2191.             skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);

  2192.         }

  2193.     } else {

  2194.         /* no supported extensions, skip the rest of the core substream */

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

  2196.     }

  2197. 

  2198.     if (s->core_ext_mask & DCA_EXT_X96)

  2199.         s->profile = FF_PROFILE_DTS_96_24;

  2200.     else if (s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH))

  2201.         s->profile = FF_PROFILE_DTS_ES;

  2202. 

  2203.     /* check for ExSS (HD part) */

  2204.     if (s->dca_buffer_size - s->frame_size > 32 &&

  2205.         get_bits_long(&s->gb, 32) == DCA_HD_MARKER)

  2206.         dca_exss_parse_header(s);

  2207. 

  2208.     avctx->profile = s->profile;

  2209. 

  2210.     full_channels = channels = s->prim_channels + !!s->lfe;

  2211. 

  2212.     /* If we have XXCH then the channel layout is managed differently */

  2213.     /* note that XLL will also have another way to do things */

  2214.     if (!(s->core_ext_mask & DCA_EXT_XXCH)

  2215.         || (s->core_ext_mask & DCA_EXT_XXCH && avctx->request_channels > 0

  2216.             && avctx->request_channels

  2217.             < num_core_channels + !!s->lfe + s->xxch_chset_nch[0]))

  2218.     { /* xxx should also do MA extensions */

  2219.         if (s->amode < 16) {

  2220.             avctx->channel_layout = dca_core_channel_layout[s->amode];

  2221. #if FF_API_REQUEST_CHANNELS

  2222. FF_DISABLE_DEPRECATION_WARNINGS

  2223.             if (s->xch_present && (!avctx->request_channels ||

  2224.                                    avctx->request_channels

  2225.                                    > num_core_channels + !!s->lfe)) {

  2226. FF_ENABLE_DEPRECATION_WARNINGS

  2227. #else

  2228.             if (s->xch_present) {

  2229. #endif

  2230.                 avctx->channel_layout |= AV_CH_BACK_CENTER;

  2231.                 if (s->lfe) {

  2232.                     avctx->channel_layout |= AV_CH_LOW_FREQUENCY;

  2233.                     s->channel_order_tab = dca_channel_reorder_lfe_xch[s->amode];

  2234.                 } else {

  2235.                     s->channel_order_tab = dca_channel_reorder_nolfe_xch[s->amode];

  2236.                 }

  2237.                 if (s->channel_order_tab[s->xch_base_channel] < 0)

  2238.                     return AVERROR_INVALIDDATA;

  2239.             } else {

  2240.                 channels = num_core_channels + !!s->lfe;

  2241.                 s->xch_present = 0; /* disable further xch processing */

  2242.                 if (s->lfe) {

  2243.                     avctx->channel_layout |= AV_CH_LOW_FREQUENCY;

  2244.                     s->channel_order_tab = dca_channel_reorder_lfe[s->amode];

  2245.                 } else

  2246.                     s->channel_order_tab = dca_channel_reorder_nolfe[s->amode];

  2247.             }

  2248. 

  2249.             if (channels > !!s->lfe &&

  2250.                 s->channel_order_tab[channels - 1 - !!s->lfe] < 0)

  2251.                 return AVERROR_INVALIDDATA;

  2252. 

  2253.             if (av_get_channel_layout_nb_channels(avctx->channel_layout) != channels) {

  2254.                 av_log(avctx, AV_LOG_ERROR, "Number of channels %d mismatches layout %d\n", channels, av_get_channel_layout_nb_channels(avctx->channel_layout));

  2255.                 return AVERROR_INVALIDDATA;

  2256.             }

  2257. 

  2258.             if (s->prim_channels > 2 &&

  2259.                 avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {

  2260.                 channels = 2;

  2261.                 s->output = DCA_STEREO;

  2262.                 avctx->channel_layout = AV_CH_LAYOUT_STEREO;

  2263.             }

  2264.             else if (avctx->request_channel_layout & AV_CH_LAYOUT_NATIVE) {

  2265.                 static const int8_t dca_channel_order_native[9] = { 0, 1, 2, 3, 4, 5, 6, 7, 8 };

  2266.                 s->channel_order_tab = dca_channel_order_native;

  2267.             }

  2268.             s->lfe_index = dca_lfe_index[s->amode];

  2269.         } else {

  2270.             av_log(avctx, AV_LOG_ERROR,

  2271.                    "Non standard configuration %d !\n", s->amode);

  2272.             return AVERROR_INVALIDDATA;

  2273.         }

  2274. 

  2275.         s->xxch_dmix_embedded = 0;

  2276.     } else {

  2277.         /* we only get here if an XXCH channel set can be added to the mix */

  2278.         channel_mask = s->xxch_core_spkmask;

  2279. 

  2280.         if (avctx->request_channels > 0

  2281.             && avctx->request_channels < s->prim_channels) {

  2282.             channels = num_core_channels + !!s->lfe;

  2283.             for (i = 0; i < s->xxch_chset && channels + s->xxch_chset_nch[i]

  2284.                                               <= avctx->request_channels; i++) {

  2285.                 channels += s->xxch_chset_nch[i];

  2286.                 channel_mask |= s->xxch_spk_masks[i];

  2287.             }

  2288.         } else {

  2289.             channels = s->prim_channels + !!s->lfe;

  2290.             for (i = 0; i < s->xxch_chset; i++) {

  2291.                 channel_mask |= s->xxch_spk_masks[i];

  2292.             }

  2293.         }

  2294. 

  2295.         /* Given the DTS spec'ed channel mask, generate an avcodec version */

  2296.         channel_layout = 0;

  2297.         for (i = 0; i < s->xxch_nbits_spk_mask; ++i) {

  2298.             if (channel_mask & (1 << i)) {

  2299.                 channel_layout |= map_xxch_to_native[i];

  2300.             }

  2301.         }

  2302. 

  2303.         /* make sure that we have managed to get equivelant dts/avcodec channel

  2304.          * masks in some sense -- unfortunately some channels could overlap */

  2305.         if (av_popcount(channel_mask) != av_popcount(channel_layout)) {

  2306.             av_log(avctx, AV_LOG_DEBUG,

  2307.                    "DTS-XXCH: Inconsistant avcodec/dts channel layouts\n");

  2308.             return AVERROR_INVALIDDATA;

  2309.         }

  2310. 

  2311.         avctx->channel_layout = channel_layout;

  2312. 

  2313.         if (!(avctx->request_channel_layout & AV_CH_LAYOUT_NATIVE)) {

  2314.             /* Estimate DTS --> avcodec ordering table */

  2315.             for (chset = -1, j = 0; chset < s->xxch_chset; ++chset) {

  2316.                 mask = chset >= 0 ? s->xxch_spk_masks[chset]

  2317.                                   : s->xxch_core_spkmask;

  2318.                 for (i = 0; i < s->xxch_nbits_spk_mask; i++) {

  2319.                     if (mask & ~(DCA_XXCH_LFE1 | DCA_XXCH_LFE2) & (1 << i)) {

  2320.                         lavc = map_xxch_to_native[i];

  2321.                         posn = av_popcount(channel_layout & (lavc - 1));

  2322.                         s->xxch_order_tab[j++] = posn;

  2323.                     }

  2324.                 }

  2325.             }

  2326. 

  2327.             s->lfe_index = av_popcount(channel_layout & (AV_CH_LOW_FREQUENCY-1));

  2328.         } else { /* native ordering */

  2329.             for (i = 0; i < channels; i++)

  2330.                 s->xxch_order_tab[i] = i;

  2331. 

  2332.             s->lfe_index = channels - 1;

  2333.         }

  2334. 

  2335.         s->channel_order_tab = s->xxch_order_tab;

  2336.     }

  2337. 

  2338.     if (avctx->channels != channels) {

  2339.         if (avctx->channels)

  2340.             av_log(avctx, AV_LOG_INFO, "Number of channels changed in DCA decoder (%d -> %d)\n", avctx->channels, channels);

  2341.         avctx->channels = channels;

  2342.     }

  2343. 

  2344.     /* get output buffer */

  2345.     frame->nb_samples = 256 * (s->sample_blocks / 8);

  2346.     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)

  2347.         return ret;

  2348.     samples_flt = (float **)frame->extended_data;

  2349. 

  2350.     /* allocate buffer for extra channels if downmixing */

  2351.     if (avctx->channels < full_channels) {

  2352.         ret = av_samples_get_buffer_size(NULL, full_channels - channels,

  2353.                                          frame->nb_samples,

  2354.                                          avctx->sample_fmt, 0);

  2355.         if (ret < 0)

  2356.             return ret;

  2357. 

  2358.         av_fast_malloc(&s->extra_channels_buffer,

  2359.                        &s->extra_channels_buffer_size, ret);

  2360.         if (!s->extra_channels_buffer)

  2361.             return AVERROR(ENOMEM);

  2362. 

  2363.         ret = av_samples_fill_arrays((uint8_t **)s->extra_channels, NULL,

  2364.                                      s->extra_channels_buffer,

  2365.                                      full_channels - channels,

  2366.                                      frame->nb_samples, avctx->sample_fmt, 0);

  2367.         if (ret < 0)

  2368.             return ret;

  2369.     }

  2370. 

  2371.     /* filter to get final output */

  2372.     for (i = 0; i < (s->sample_blocks / 8); i++) {

  2373.         int ch;

  2374. 

  2375.         for (ch = 0; ch < channels; ch++)

  2376.             s->samples_chanptr[ch] = samples_flt[ch] + i * 256;

  2377.         for (; ch < full_channels; ch++)

  2378.             s->samples_chanptr[ch] = s->extra_channels[ch - channels] + i * 256;

  2379. 

  2380.         dca_filter_channels(s, i);

  2381. 

  2382.         /* If this was marked as a DTS-ES stream we need to subtract back- */

  2383.         /* channel from SL & SR to remove matrixed back-channel signal */

  2384.         if ((s->source_pcm_res & 1) && s->xch_present) {

  2385.             float *back_chan = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel]];

  2386.             float *lt_chan   = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel - 2]];

  2387.             float *rt_chan   = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel - 1]];

  2388.             s->fdsp.vector_fmac_scalar(lt_chan, back_chan, -M_SQRT1_2, 256);

  2389.             s->fdsp.vector_fmac_scalar(rt_chan, back_chan, -M_SQRT1_2, 256);

  2390.         }

  2391. 

  2392.         /* If stream contains XXCH, we might need to undo an embedded downmix */

  2393.         if (s->xxch_dmix_embedded) {

  2394.             /* Loop over channel sets in turn */

  2395.             ch = num_core_channels;

  2396.             for (chset = 0; chset < s->xxch_chset; chset++) {

  2397.                 endch = ch + s->xxch_chset_nch[chset];

  2398.                 mask = s->xxch_dmix_embedded;

  2399. 

  2400.                 /* undo downmix */

  2401.                 for (j = ch; j < endch; j++) {

  2402.                     if (mask & (1 << j)) { /* this channel has been mixed-out */

  2403.                         src_chan = s->samples_chanptr[s->channel_order_tab[j]];

  2404.                         for (k = 0; k < endch; k++) {

  2405.                             achan = s->channel_order_tab[k];

  2406.                             scale = s->xxch_dmix_coeff[j][k];

  2407.                             if (scale != 0.0) {

  2408.                                 dst_chan = s->samples_chanptr[achan];

  2409.                                 s->fdsp.vector_fmac_scalar(dst_chan, src_chan,

  2410.                                                            -scale, 256);

  2411.                             }

  2412.                         }

  2413.                     }

  2414.                 }

  2415. 

  2416.                 /* if a downmix has been embedded then undo the pre-scaling */

  2417.                 if ((mask & (1 << ch)) && s->xxch_dmix_sf[chset] != 1.0f) {

  2418.                     scale = s->xxch_dmix_sf[chset];

  2419. 

  2420.                     for (j = 0; j < ch; j++) {

  2421.                         src_chan = s->samples_chanptr[s->channel_order_tab[j]];

  2422.                         for (k = 0; k < 256; k++)

  2423.                             src_chan[k] *= scale;

  2424.                     }

  2425. 

  2426.                     /* LFE channel is always part of core, scale if it exists */

  2427.                     if (s->lfe) {

  2428.                         src_chan = s->samples_chanptr[s->lfe_index];

  2429.                         for (k = 0; k < 256; k++)

  2430.                             src_chan[k] *= scale;

  2431.                     }

  2432.                 }

  2433. 

  2434.                 ch = endch;

  2435.             }

  2436. 

  2437.         }

  2438.     }

  2439. 

  2440.     /* update lfe history */

  2441.     lfe_samples = 2 * s->lfe * (s->sample_blocks / 8);

  2442.     for (i = 0; i < 2 * s->lfe * 4; i++)

  2443.         s->lfe_data[i] = s->lfe_data[i + lfe_samples];

  2444. 

  2445.     *got_frame_ptr = 1;

  2446. 

  2447.     return buf_size;

  2448. }

  2449. 

  2450. 

  2451. 

  2452. /**

  2453.  * DCA initialization

  2454.  *

  2455.  * @param avctx     pointer to the AVCodecContext

  2456.  */

  2457. 

  2458. static av_cold int dca_decode_init(AVCodecContext *avctx)

  2459. {

  2460.     DCAContext *s = avctx->priv_data;

  2461. 

  2462.     s->avctx = avctx;

  2463.     dca_init_vlcs();

  2464. 

  2465.     avpriv_float_dsp_init(&s->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);

  2466.     ff_mdct_init(&s->imdct, 6, 1, 1.0);

  2467.     ff_synth_filter_init(&s->synth);

  2468.     ff_dcadsp_init(&s->dcadsp);

  2469.     ff_fmt_convert_init(&s->fmt_conv, avctx);

  2470. 

  2471.     avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;

  2472. 

  2473.     /* allow downmixing to stereo */

  2474. #if FF_API_REQUEST_CHANNELS

  2475. FF_DISABLE_DEPRECATION_WARNINGS

  2476.     if (avctx->request_channels == 2)

  2477.         avctx->request_channel_layout = AV_CH_LAYOUT_STEREO;

  2478. FF_ENABLE_DEPRECATION_WARNINGS

  2479. #endif

  2480.     if (avctx->channels > 2 &&

  2481.         avctx->request_channel_layout == AV_CH_LAYOUT_STEREO)

  2482.         avctx->channels = 2;

  2483. 

  2484.     return 0;

  2485. }

  2486. 

  2487. static av_cold int dca_decode_end(AVCodecContext *avctx)

  2488. {

  2489.     DCAContext *s = avctx->priv_data;

  2490.     ff_mdct_end(&s->imdct);

  2491.     av_freep(&s->extra_channels_buffer);

  2492.     return 0;

  2493. }

  2494. 

  2495. static const AVProfile profiles[] = {

  2496.     { FF_PROFILE_DTS,        "DTS"        },

  2497.     { FF_PROFILE_DTS_ES,     "DTS-ES"     },

  2498.     { FF_PROFILE_DTS_96_24,  "DTS 96/24"  },

  2499.     { FF_PROFILE_DTS_HD_HRA, "DTS-HD HRA" },

  2500.     { FF_PROFILE_DTS_HD_MA,  "DTS-HD MA"  },

  2501.     { FF_PROFILE_UNKNOWN },

  2502. };

  2503. 

  2504. AVCodec ff_dca_decoder = {

  2505.     .name            = "dca",

  2506.     .long_name       = NULL_IF_CONFIG_SMALL("DCA (DTS Coherent Acoustics)"),

  2507.     .type            = AVMEDIA_TYPE_AUDIO,

  2508.     .id              = AV_CODEC_ID_DTS,

  2509.     .priv_data_size  = sizeof(DCAContext),

  2510.     .init            = dca_decode_init,

  2511.     .decode          = dca_decode_frame,

  2512.     .close           = dca_decode_end,

  2513.     .capabilities    = CODEC_CAP_CHANNEL_CONF | CODEC_CAP_DR1,

  2514.     .sample_fmts     = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,

  2515.                                                        AV_SAMPLE_FMT_NONE },

  2516.     .profiles        = NULL_IF_CONFIG_SMALL(profiles),

  2517. };