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FFmpeg/libavcodec/dcadec.c

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  1. /*

  2.  * DCA compatible decoder

  3.  * Copyright (C) 2004 Gildas Bazin

  4.  * Copyright (C) 2004 Benjamin Zores

  5.  * Copyright (C) 2006 Benjamin Larsson

  6.  * Copyright (C) 2007 Konstantin Shishkov

  7.  *

  8.  * This file is part of Libav.

  9.  *

  10.  * Libav 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.  * Libav 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 Libav; if not, write to the Free Software

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

  23.  */

  24. 

  25. #include <math.h>

  26. #include <stddef.h>

  27. #include <stdio.h>

  28. 

  29. #include "libavutil/channel_layout.h"

  30. #include "libavutil/common.h"

  31. #include "libavutil/float_dsp.h"

  32. #include "libavutil/internal.h"

  33. #include "libavutil/intreadwrite.h"

  34. #include "libavutil/mathematics.h"

  35. #include "libavutil/opt.h"

  36. #include "libavutil/samplefmt.h"

  37. #include "avcodec.h"

  38. #include "fft.h"

  39. #include "get_bits.h"

  40. #include "put_bits.h"

  41. #include "dcadata.h"

  42. #include "dcahuff.h"

  43. #include "dca.h"

  44. #include "mathops.h"

  45. #include "synth_filter.h"

  46. #include "dcadsp.h"

  47. #include "fmtconvert.h"

  48. #include "internal.h"

  49. 

  50. #if ARCH_ARM

  51. #   include "arm/dca.h"

  52. #endif

  53. 

  54. //#define TRACE

  55. 

  56. #define DCA_PRIM_CHANNELS_MAX  (7)

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

  58. #define DCA_SUBSUBFRAMES_MAX   (4)

  59. #define DCA_SUBFRAMES_MAX     (16)

  60. #define DCA_BLOCKS_MAX        (16)

  61. #define DCA_LFE_MAX            (3)

  62. 

  63. enum DCAMode {

  64.     DCA_MONO = 0,

  65.     DCA_CHANNEL,

  66.     DCA_STEREO,

  67.     DCA_STEREO_SUMDIFF,

  68.     DCA_STEREO_TOTAL,

  69.     DCA_3F,

  70.     DCA_2F1R,

  71.     DCA_3F1R,

  72.     DCA_2F2R,

  73.     DCA_3F2R,

  74.     DCA_4F2R

  75. };

  76. 

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

  78. enum DCAExSSSpeakerMask {

  79.     DCA_EXSS_FRONT_CENTER          = 0x0001,

  80.     DCA_EXSS_FRONT_LEFT_RIGHT      = 0x0002,

  81.     DCA_EXSS_SIDE_REAR_LEFT_RIGHT  = 0x0004,

  82.     DCA_EXSS_LFE                   = 0x0008,

  83.     DCA_EXSS_REAR_CENTER           = 0x0010,

  84.     DCA_EXSS_FRONT_HIGH_LEFT_RIGHT = 0x0020,

  85.     DCA_EXSS_REAR_LEFT_RIGHT       = 0x0040,

  86.     DCA_EXSS_FRONT_HIGH_CENTER     = 0x0080,

  87.     DCA_EXSS_OVERHEAD              = 0x0100,

  88.     DCA_EXSS_CENTER_LEFT_RIGHT     = 0x0200,

  89.     DCA_EXSS_WIDE_LEFT_RIGHT       = 0x0400,

  90.     DCA_EXSS_SIDE_LEFT_RIGHT       = 0x0800,

  91.     DCA_EXSS_LFE2                  = 0x1000,

  92.     DCA_EXSS_SIDE_HIGH_LEFT_RIGHT  = 0x2000,

  93.     DCA_EXSS_REAR_HIGH_CENTER      = 0x4000,

  94.     DCA_EXSS_REAR_HIGH_LEFT_RIGHT  = 0x8000,

  95. };

  96. 

  97. enum DCAExtensionMask {

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

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

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

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

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

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

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

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

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

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

  108. };

  109. 

  110. /* -1 are reserved or unknown */

  111. static const int dca_ext_audio_descr_mask[] = {

  112.     DCA_EXT_XCH,

  113.     -1,

  114.     DCA_EXT_X96,

  115.     DCA_EXT_XCH | DCA_EXT_X96,

  116.     -1,

  117.     -1,

  118.     DCA_EXT_XXCH,

  119.     -1,

  120. };

  121. 

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

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

  124. 

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

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

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

  128.  *

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

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

  131.  * OV -> center back

  132.  * All 2 channel configurations -> AV_CH_LAYOUT_STEREO

  133.  */

  134. static const uint64_t dca_core_channel_layout[] = {

  135.     AV_CH_FRONT_CENTER,                                                     ///< 1, A

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

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

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

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

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

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

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

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

  144. 

  145.     AV_CH_LAYOUT_STEREO | AV_CH_FRONT_CENTER | AV_CH_SIDE_LEFT |

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

  147. 

  148.     AV_CH_LAYOUT_STEREO | AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT |

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

  150. 

  151.     AV_CH_LAYOUT_STEREO | AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT |

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

  153. 

  154.     AV_CH_FRONT_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER |

  155.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_BACK_CENTER   |

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

  157. 

  158.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_CENTER   |

  159.     AV_CH_FRONT_RIGHT_OF_CENTER | AV_CH_LAYOUT_STEREO |

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

  161. 

  162.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER |

  163.     AV_CH_LAYOUT_STEREO | AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT |

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

  165. 

  166.     AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_CENTER   |

  167.     AV_CH_FRONT_RIGHT_OF_CENTER | AV_CH_LAYOUT_STEREO |

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

  169. };

  170. 

  171. static const int8_t dca_lfe_index[] = {

  172.     1, 2, 2, 2, 2, 3, 2, 3, 2, 3, 2, 3, 1, 3, 2, 3

  173. };

  174. 

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

  176.     { 0, -1, -1, -1, -1, -1, -1, -1, -1},

  177.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  178.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  179.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  180.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  181.     { 2,  0,  1, -1, -1, -1, -1, -1, -1},

  182.     { 0,  1,  3, -1, -1, -1, -1, -1, -1},

  183.     { 2,  0,  1,  4, -1, -1, -1, -1, -1},

  184.     { 0,  1,  3,  4, -1, -1, -1, -1, -1},

  185.     { 2,  0,  1,  4,  5, -1, -1, -1, -1},

  186.     { 3,  4,  0,  1,  5,  6, -1, -1, -1},

  187.     { 2,  0,  1,  4,  5,  6, -1, -1, -1},

  188.     { 0,  6,  4,  5,  2,  3, -1, -1, -1},

  189.     { 4,  2,  5,  0,  1,  6,  7, -1, -1},

  190.     { 5,  6,  0,  1,  7,  3,  8,  4, -1},

  191.     { 4,  2,  5,  0,  1,  6,  8,  7, -1},

  192. };

  193. 

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

  195.     { 0,  2, -1, -1, -1, -1, -1, -1, -1},

  196.     { 0,  1,  3, -1, -1, -1, -1, -1, -1},

  197.     { 0,  1,  3, -1, -1, -1, -1, -1, -1},

  198.     { 0,  1,  3, -1, -1, -1, -1, -1, -1},

  199.     { 0,  1,  3, -1, -1, -1, -1, -1, -1},

  200.     { 2,  0,  1,  4, -1, -1, -1, -1, -1},

  201.     { 0,  1,  3,  4, -1, -1, -1, -1, -1},

  202.     { 2,  0,  1,  4,  5, -1, -1, -1, -1},

  203.     { 0,  1,  4,  5,  3, -1, -1, -1, -1},

  204.     { 2,  0,  1,  5,  6,  4, -1, -1, -1},

  205.     { 3,  4,  0,  1,  6,  7,  5, -1, -1},

  206.     { 2,  0,  1,  4,  5,  6,  7, -1, -1},

  207.     { 0,  6,  4,  5,  2,  3,  7, -1, -1},

  208.     { 4,  2,  5,  0,  1,  7,  8,  6, -1},

  209.     { 5,  6,  0,  1,  8,  3,  9,  4,  7},

  210.     { 4,  2,  5,  0,  1,  6,  9,  8,  7},

  211. };

  212. 

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

  214.     { 0, -1, -1, -1, -1, -1, -1, -1, -1},

  215.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  216.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  217.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  218.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  219.     { 2,  0,  1, -1, -1, -1, -1, -1, -1},

  220.     { 0,  1,  2, -1, -1, -1, -1, -1, -1},

  221.     { 2,  0,  1,  3, -1, -1, -1, -1, -1},

  222.     { 0,  1,  2,  3, -1, -1, -1, -1, -1},

  223.     { 2,  0,  1,  3,  4, -1, -1, -1, -1},

  224.     { 2,  3,  0,  1,  4,  5, -1, -1, -1},

  225.     { 2,  0,  1,  3,  4,  5, -1, -1, -1},

  226.     { 0,  5,  3,  4,  1,  2, -1, -1, -1},

  227.     { 3,  2,  4,  0,  1,  5,  6, -1, -1},

  228.     { 4,  5,  0,  1,  6,  2,  7,  3, -1},

  229.     { 3,  2,  4,  0,  1,  5,  7,  6, -1},

  230. };

  231. 

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

  233.     { 0,  1, -1, -1, -1, -1, -1, -1, -1},

  234.     { 0,  1,  2, -1, -1, -1, -1, -1, -1},

  235.     { 0,  1,  2, -1, -1, -1, -1, -1, -1},

  236.     { 0,  1,  2, -1, -1, -1, -1, -1, -1},

  237.     { 0,  1,  2, -1, -1, -1, -1, -1, -1},

  238.     { 2,  0,  1,  3, -1, -1, -1, -1, -1},

  239.     { 0,  1,  2,  3, -1, -1, -1, -1, -1},

  240.     { 2,  0,  1,  3,  4, -1, -1, -1, -1},

  241.     { 0,  1,  3,  4,  2, -1, -1, -1, -1},

  242.     { 2,  0,  1,  4,  5,  3, -1, -1, -1},

  243.     { 2,  3,  0,  1,  5,  6,  4, -1, -1},

  244.     { 2,  0,  1,  3,  4,  5,  6, -1, -1},

  245.     { 0,  5,  3,  4,  1,  2,  6, -1, -1},

  246.     { 3,  2,  4,  0,  1,  6,  7,  5, -1},

  247.     { 4,  5,  0,  1,  7,  2,  8,  3,  6},

  248.     { 3,  2,  4,  0,  1,  5,  8,  7,  6},

  249. };

  250. 

  251. #define DCA_DOLBY                  101           /* FIXME */

  252. 

  253. #define DCA_CHANNEL_BITS             6

  254. #define DCA_CHANNEL_MASK          0x3F

  255. 

  256. #define DCA_LFE                   0x80

  257. 

  258. #define HEADER_SIZE                 14

  259. 

  260. #define DCA_MAX_FRAME_SIZE       16384

  261. #define DCA_MAX_EXSS_HEADER_SIZE  4096

  262. 

  263. #define DCA_BUFFER_PADDING_SIZE   1024

  264. 

  265. #define DCA_NSYNCAUX        0x9A1105A0

  266. 

  267. /** Bit allocation */

  268. typedef struct {

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

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

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

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

  273. } BitAlloc;

  274. 

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

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

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

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

  279. 

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

  281.                                          int idx)

  282. {

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

  284.            ba->offset;

  285. }

  286. 

  287. typedef struct {

  288.     AVClass *class;             ///< class for AVOptions

  289.     AVCodecContext *avctx;

  290.     /* Frame header */

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

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

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

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

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

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

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

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

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

  300. 

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

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

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

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

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

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

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

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

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

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

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

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

  313.     int copy_history;           ///< copy history

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

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

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

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

  318. 

  319.     /* Primary audio coding header */

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

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

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

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

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

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

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

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

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

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

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

  331. 

  332.     /* Primary audio coding side information */

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

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

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

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

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

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

  339.     int32_t scale_factor[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][2];///< scale factors (2 if transient)

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

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

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

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

  344. 

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

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

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

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

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

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

  351. 

  352.     int32_t  high_freq_vq[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS];  ///< VQ encoded high frequency subbands

  353. 

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

  355.     int lfe_scale_factor;

  356. 

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

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

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

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

  361.     int hist_index[DCA_PRIM_CHANNELS_MAX];

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

  363. 

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

  365. 

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

  367.     float *samples_chanptr[DCA_PRIM_CHANNELS_MAX + 1];

  368.     float *extra_channels[DCA_PRIM_CHANNELS_MAX + 1];

  369.     uint8_t *extra_channels_buffer;

  370.     unsigned int extra_channels_buffer_size;

  371. 

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

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

  374. 

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

  376.     GetBitContext gb;

  377.     /* Current position in DCA frame */

  378.     int current_subframe;

  379.     int current_subsubframe;

  380. 

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

  382. 

  383.     /* XCh extension information */

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

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

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

  387. 

  388.     /* ExSS header parser */

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

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

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

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

  393. 

  394.     int profile;

  395. 

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

  397.     AVFloatDSPContext fdsp;

  398.     FFTContext imdct;

  399.     SynthFilterContext synth;

  400.     DCADSPContext dcadsp;

  401.     FmtConvertContext fmt_conv;

  402. } DCAContext;

  403. 

  404. static const uint16_t dca_vlc_offs[] = {

  405.         0,   512,   640,   768,  1282,  1794,  2436,  3080,  3770,  4454,  5364,

  406.      5372,  5380,  5388,  5392,  5396,  5412,  5420,  5428,  5460,  5492,  5508,

  407.      5572,  5604,  5668,  5796,  5860,  5892,  6412,  6668,  6796,  7308,  7564,

  408.      7820,  8076,  8620,  9132,  9388,  9910, 10166, 10680, 11196, 11726, 12240,

  409.     12752, 13298, 13810, 14326, 14840, 15500, 16022, 16540, 17158, 17678, 18264,

  410.     18796, 19352, 19926, 20468, 21472, 22398, 23014, 23622,

  411. };

  412. 

  413. static av_cold void dca_init_vlcs(void)

  414. {

  415.     static int vlcs_initialized = 0;

  416.     int i, j, c = 14;

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

  418. 

  419.     if (vlcs_initialized)

  420.         return;

  421. 

  422.     dca_bitalloc_index.offset = 1;

  423.     dca_bitalloc_index.wrap = 2;

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

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

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

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

  428.                  bitalloc_12_bits[i], 1, 1,

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

  430.     }

  431.     dca_scalefactor.offset = -64;

  432.     dca_scalefactor.wrap = 2;

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

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

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

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

  437.                  scales_bits[i], 1, 1,

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

  439.     }

  440.     dca_tmode.offset = 0;

  441.     dca_tmode.wrap = 1;

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

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

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

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

  446.                  tmode_bits[i], 1, 1,

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

  448.     }

  449. 

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

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

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

  453.                 break;

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

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

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

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

  458. 

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

  460.                      bitalloc_sizes[i],

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

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

  463.             c++;

  464.         }

  465.     vlcs_initialized = 1;

  466. }

  467. 

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

  469. {

  470.     while (len--)

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

  472. }

  473. 

  474. static int dca_parse_audio_coding_header(DCAContext *s, int base_channel)

  475. {

  476.     int i, j;

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

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

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

  480. 

  481.     s->total_channels = get_bits(&s->gb, 3) + 1 + base_channel;

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

  483. 

  484.     if (s->prim_channels > DCA_PRIM_CHANNELS_MAX)

  485.         s->prim_channels = DCA_PRIM_CHANNELS_MAX;

  486. 

  487. 

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

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

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

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

  492.     }

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

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

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

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

  497.     }

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

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

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

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

  502. 

  503.     /* Get codebooks quantization indexes */

  504.     if (!base_channel)

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

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

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

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

  509. 

  510.     /* Get scale factor adjustment */

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

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

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

  514. 

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

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

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

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

  519. 

  520.     if (s->crc_present) {

  521.         /* Audio header CRC check */

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

  523.     }

  524. 

  525.     s->current_subframe    = 0;

  526.     s->current_subsubframe = 0;

  527. 

  528. #ifdef TRACE

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

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

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

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

  533.                s->subband_activity[i]);

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

  535.                s->vq_start_subband[i]);

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

  537.                s->joint_intensity[i]);

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

  539.                s->transient_huffman[i]);

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

  541.                s->scalefactor_huffman[i]);

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

  543.                s->bitalloc_huffman[i]);

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

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

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

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

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

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

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

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

  552.     }

  553. #endif

  554. 

  555.     return 0;

  556. }

  557. 

  558. static int dca_parse_frame_header(DCAContext *s)

  559. {

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

  561. 

  562.     /* Sync code */

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

  564. 

  565.     /* Frame header */

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

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

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

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

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

  571.     if (s->frame_size < 95)

  572.         return AVERROR_INVALIDDATA;

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

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

  575.     if (!s->sample_rate)

  576.         return AVERROR_INVALIDDATA;

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

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

  579.     if (!s->bit_rate)

  580.         return AVERROR_INVALIDDATA;

  581. 

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

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

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

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

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

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

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

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

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

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

  592. 

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

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

  595.         return AVERROR_INVALIDDATA;

  596.     }

  597. 

  598.     /* TODO: check CRC */

  599.     if (s->crc_present)

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

  601. 

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

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

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

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

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

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

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

  609. 

  610.     /* FIXME: channels mixing levels */

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

  612.     if (s->lfe)

  613.         s->output |= DCA_LFE;

  614. 

  615. #ifdef TRACE

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

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

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

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

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

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

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

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

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

  625.            s->sample_rate);

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

  627.            s->bit_rate);

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

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

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

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

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

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

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

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

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

  637.            s->predictor_history);

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

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

  640.            s->multirate_inter);

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

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

  643.     av_log(s->avctx, AV_LOG_DEBUG,

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

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

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

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

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

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

  650. #endif

  651. 

  652.     /* Primary audio coding header */

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

  654. 

  655.     return dca_parse_audio_coding_header(s, 0);

  656. }

  657. 

  658. 

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

  660. {

  661.     if (level < 5) {

  662.         /* huffman encoded */

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

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

  665.     } else if (level < 8) {

  666.         if (level + 1 > log2range) {

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

  668.             value = get_bits(gb, log2range);

  669.         } else {

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

  671.         }

  672.     }

  673.     return value;

  674. }

  675. 

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

  677. {

  678.     /* Primary audio coding side information */

  679.     int j, k;

  680. 

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

  682.         return AVERROR_INVALIDDATA;

  683. 

  684.     if (!base_channel) {

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

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

  687.     }

  688. 

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

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

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

  692.     }

  693. 

  694.     /* Get prediction codebook */

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

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

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

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

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

  700.             }

  701.         }

  702.     }

  703. 

  704.     /* Bit allocation index */

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

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

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

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

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

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

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

  712.                 av_log(s->avctx, AV_LOG_ERROR,

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

  714.                 return AVERROR_INVALIDDATA;

  715.             } else {

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

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

  718.             }

  719. 

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

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

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

  723.                 return AVERROR_INVALIDDATA;

  724.             }

  725.         }

  726.     }

  727. 

  728.     /* Transition mode */

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

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

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

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

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

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

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

  736.             }

  737.         }

  738.     }

  739. 

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

  741.         return AVERROR_INVALIDDATA;

  742. 

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

  744.         const uint32_t *scale_table;

  745.         int scale_sum, log_size;

  746. 

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

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

  749. 

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

  751.             scale_table = scale_factor_quant7;

  752.             log_size = 7;

  753.         } else {

  754.             scale_table = scale_factor_quant6;

  755.             log_size = 6;

  756.         }

  757. 

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

  759.         scale_sum = 0;

  760. 

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

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

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

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

  765.             }

  766. 

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

  768.                 /* Get second scale factor */

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

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

  771.             }

  772.         }

  773.     }

  774. 

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

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

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

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

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

  780.     }

  781. 

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

  783.         return AVERROR_INVALIDDATA;

  784. 

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

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

  787.         int source_channel;

  788. 

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

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

  791.             int scale = 0;

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

  793. 

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

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

  796. 

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

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

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

  800.             }

  801. 

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

  803.                 av_log(s->avctx, AV_LOG_DEBUG,

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

  805.                 s->debug_flag |= 0x02;

  806.             }

  807.         }

  808.     }

  809. 

  810.     /* Dynamic range coefficient */

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

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

  813. 

  814.     /* Side information CRC check word */

  815.     if (s->crc_present) {

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

  817.     }

  818. 

  819.     /*

  820.      * Primary audio data arrays

  821.      */

  822. 

  823.     /* VQ encoded high frequency subbands */

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

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

  826.             /* 1 vector -> 32 samples */

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

  828. 

  829.     /* Low frequency effect data */

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

  831.         /* LFE samples */

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

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

  834.         float lfe_scale;

  835. 

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

  837.             /* Signed 8 bits int */

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

  839.         }

  840. 

  841.         /* Scale factor index */

  842.         skip_bits(&s->gb, 1);

  843.         s->lfe_scale_factor = scale_factor_quant7[get_bits(&s->gb, 7)];

  844. 

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

  846.         lfe_scale = 0.035 * s->lfe_scale_factor;

  847. 

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

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

  850.     }

  851. 

  852. #ifdef TRACE

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

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

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

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

  857. 

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

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

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

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

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

  863.     }

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

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

  866.             av_log(s->avctx, AV_LOG_DEBUG,

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

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

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

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

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

  872.     }

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

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

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

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

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

  878.     }

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

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

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

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

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

  884.     }

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

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

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

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

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

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

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

  892.         }

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

  894.     }

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

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

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

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

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

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

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

  902.         }

  903.     }

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

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

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

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

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

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

  910. 

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

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

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

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

  915.     }

  916. #endif

  917. 

  918.     return 0;

  919. }

  920. 

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

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

  923.                             float scale)

  924. {

  925.     const float *prCoeff;

  926. 

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

  928. 

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

  930. 

  931.     /* Select filter */

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

  933.         prCoeff = fir_32bands_nonperfect;

  934.     else                        /* Perfect reconstruction */

  935.         prCoeff = fir_32bands_perfect;

  936. 

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

  938.                               s->subband_fir_hist[chans],

  939.                               &s->hist_index[chans],

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

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

  942. }

  943. 

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

  945.                                   int num_deci_sample, float *samples_in,

  946.                                   float *samples_out)

  947. {

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

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

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

  951.      *   from last subframe as history.

  952.      *

  953.      * samples_out: An array holding interpolated samples

  954.      */

  955. 

  956.     int idx;

  957.     const float *prCoeff;

  958.     int deciindex;

  959. 

  960.     /* Select decimation filter */

  961.     if (decimation_select == 1) {

  962.         idx = 1;

  963.         prCoeff = lfe_fir_128;

  964.     } else {

  965.         idx = 0;

  966.         prCoeff = lfe_fir_64;

  967.     }

  968.     /* Interpolation */

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

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

  971.         samples_in++;

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

  973.     }

  974. }

  975. 

  976. /* downmixing routines */

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

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

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

  980. 

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

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

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

  984. 

  985. #define MIX_FRONT3(samples, coef)                                      \

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

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

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

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

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

  991. 

  992. #define DOWNMIX_TO_STEREO(op1, op2)             \

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

  994.         op1                                     \

  995.         op2                                     \

  996.     }

  997. 

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

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

  1000.                         const int8_t *channel_mapping)

  1001. {

  1002.     int c, l, r, sl, sr, s;

  1003.     int i;

  1004.     float t, u, v;

  1005. 

  1006.     switch (srcfmt) {

  1007.     case DCA_MONO:

  1008.     case DCA_4F2R:

  1009.         av_log(NULL, 0, "Not implemented!\n");

  1010.         break;

  1011.     case DCA_CHANNEL:

  1012.     case DCA_STEREO:

  1013.     case DCA_STEREO_TOTAL:

  1014.     case DCA_STEREO_SUMDIFF:

  1015.         break;

  1016.     case DCA_3F:

  1017.         c = channel_mapping[0];

  1018.         l = channel_mapping[1];

  1019.         r = channel_mapping[2];

  1020.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef), );

  1021.         break;

  1022.     case DCA_2F1R:

  1023.         s = channel_mapping[2];

  1024.         DOWNMIX_TO_STEREO(MIX_REAR1(samples, s, 2, coef), );

  1025.         break;

  1026.     case DCA_3F1R:

  1027.         c = channel_mapping[0];

  1028.         l = channel_mapping[1];

  1029.         r = channel_mapping[2];

  1030.         s = channel_mapping[3];

  1031.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),

  1032.                           MIX_REAR1(samples, s, 3, coef));

  1033.         break;

  1034.     case DCA_2F2R:

  1035.         sl = channel_mapping[2];

  1036.         sr = channel_mapping[3];

  1037.         DOWNMIX_TO_STEREO(MIX_REAR2(samples, sl, sr, 2, coef), );

  1038.         break;

  1039.     case DCA_3F2R:

  1040.         c  = channel_mapping[0];

  1041.         l  = channel_mapping[1];

  1042.         r  = channel_mapping[2];

  1043.         sl = channel_mapping[3];

  1044.         sr = channel_mapping[4];

  1045.         DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),

  1046.                           MIX_REAR2(samples, sl, sr, 3, coef));

  1047.         break;

  1048.     }

  1049.     if (lfe_present) {

  1050.         int lf_buf = dca_lfe_index[srcfmt];

  1051.         int lf_idx = dca_channels [srcfmt];

  1052.         for (i = 0; i < 256; i++) {

  1053.             samples[0][i] += samples[lf_buf][i] * coef[lf_idx][0];

  1054.             samples[1][i] += samples[lf_buf][i] * coef[lf_idx][1];

  1055.         }

  1056.     }

  1057. }

  1058. 

  1059. 

  1060. #ifndef decode_blockcodes

  1061. /* Very compact version of the block code decoder that does not use table

  1062.  * look-up but is slightly slower */

  1063. static int decode_blockcode(int code, int levels, int32_t *values)

  1064. {

  1065.     int i;

  1066.     int offset = (levels - 1) >> 1;

  1067. 

  1068.     for (i = 0; i < 4; i++) {

  1069.         int div = FASTDIV(code, levels);

  1070.         values[i] = code - offset - div * levels;

  1071.         code = div;

  1072.     }

  1073. 

  1074.     return code;

  1075. }

  1076. 

  1077. static int decode_blockcodes(int code1, int code2, int levels, int32_t *values)

  1078. {

  1079.     return decode_blockcode(code1, levels, values) |

  1080.            decode_blockcode(code2, levels, values + 4);

  1081. }

  1082. #endif

  1083. 

  1084. static const uint8_t abits_sizes[7]  = { 7, 10, 12, 13, 15, 17, 19 };

  1085. static const uint8_t abits_levels[7] = { 3,  5,  7,  9, 13, 17, 25 };

  1086. 

  1087. static int dca_subsubframe(DCAContext *s, int base_channel, int block_index)

  1088. {

  1089.     int k, l;

  1090.     int subsubframe = s->current_subsubframe;

  1091. 

  1092.     const float *quant_step_table;

  1093. 

  1094.     /* FIXME */

  1095.     float (*subband_samples)[DCA_SUBBANDS][8] = s->subband_samples[block_index];

  1096.     LOCAL_ALIGNED_16(int32_t, block, [8 * DCA_SUBBANDS]);

  1097. 

  1098.     /*

  1099.      * Audio data

  1100.      */

  1101. 

  1102.     /* Select quantization step size table */

  1103.     if (s->bit_rate_index == 0x1f)

  1104.         quant_step_table = lossless_quant_d;

  1105.     else

  1106.         quant_step_table = lossy_quant_d;

  1107. 

  1108.     for (k = base_channel; k < s->prim_channels; k++) {

  1109.         float rscale[DCA_SUBBANDS];

  1110. 

  1111.         if (get_bits_left(&s->gb) < 0)

  1112.             return AVERROR_INVALIDDATA;

  1113. 

  1114.         for (l = 0; l < s->vq_start_subband[k]; l++) {

  1115.             int m;

  1116. 

  1117.             /* Select the mid-tread linear quantizer */

  1118.             int abits = s->bitalloc[k][l];

  1119. 

  1120.             float quant_step_size = quant_step_table[abits];

  1121. 

  1122.             /*

  1123.              * Determine quantization index code book and its type

  1124.              */

  1125. 

  1126.             /* Select quantization index code book */

  1127.             int sel = s->quant_index_huffman[k][abits];

  1128. 

  1129.             /*

  1130.              * Extract bits from the bit stream

  1131.              */

  1132.             if (!abits) {

  1133.                 rscale[l] = 0;

  1134.                 memset(block + 8 * l, 0, 8 * sizeof(block[0]));

  1135.             } else {

  1136.                 /* Deal with transients */

  1137.                 int sfi = s->transition_mode[k][l] && subsubframe >= s->transition_mode[k][l];

  1138.                 rscale[l] = quant_step_size * s->scale_factor[k][l][sfi] *

  1139.                                s->scalefactor_adj[k][sel];

  1140. 

  1141.                 if (abits >= 11 || !dca_smpl_bitalloc[abits].vlc[sel].table) {

  1142.                     if (abits <= 7) {

  1143.                         /* Block code */

  1144.                         int block_code1, block_code2, size, levels, err;

  1145. 

  1146.                         size   = abits_sizes[abits - 1];

  1147.                         levels = abits_levels[abits - 1];

  1148. 

  1149.                         block_code1 = get_bits(&s->gb, size);

  1150.                         block_code2 = get_bits(&s->gb, size);

  1151.                         err = decode_blockcodes(block_code1, block_code2,

  1152.                                                 levels, block + 8 * l);

  1153.                         if (err) {

  1154.                             av_log(s->avctx, AV_LOG_ERROR,

  1155.                                    "ERROR: block code look-up failed\n");

  1156.                             return AVERROR_INVALIDDATA;

  1157.                         }

  1158.                     } else {

  1159.                         /* no coding */

  1160.                         for (m = 0; m < 8; m++)

  1161.                             block[8 * l + m] = get_sbits(&s->gb, abits - 3);

  1162.                     }

  1163.                 } else {

  1164.                     /* Huffman coded */

  1165.                     for (m = 0; m < 8; m++)

  1166.                         block[8 * l + m] = get_bitalloc(&s->gb,

  1167.                                                 &dca_smpl_bitalloc[abits], sel);

  1168.                 }

  1169. 

  1170.             }

  1171.         }

  1172. 

  1173.         s->fmt_conv.int32_to_float_fmul_array8(&s->fmt_conv, subband_samples[k][0],

  1174.                                                block, rscale, 8 * s->vq_start_subband[k]);

  1175. 

  1176.         for (l = 0; l < s->vq_start_subband[k]; l++) {

  1177.             int m;

  1178.             /*

  1179.              * Inverse ADPCM if in prediction mode

  1180.              */

  1181.             if (s->prediction_mode[k][l]) {

  1182.                 int n;

  1183.                 if (s->predictor_history)

  1184.                     subband_samples[k][l][0] += (adpcm_vb[s->prediction_vq[k][l]][0] *

  1185.                                                  s->subband_samples_hist[k][l][3] +

  1186.                                                  adpcm_vb[s->prediction_vq[k][l]][1] *

  1187.                                                  s->subband_samples_hist[k][l][2] +

  1188.                                                  adpcm_vb[s->prediction_vq[k][l]][2] *

  1189.                                                  s->subband_samples_hist[k][l][1] +

  1190.                                                  adpcm_vb[s->prediction_vq[k][l]][3] *

  1191.                                                  s->subband_samples_hist[k][l][0]) *

  1192.                                                 (1.0f / 8192);

  1193.                 for (m = 1; m < 8; m++) {

  1194.                     float sum = adpcm_vb[s->prediction_vq[k][l]][0] *

  1195.                                 subband_samples[k][l][m - 1];

  1196.                     for (n = 2; n <= 4; n++)

  1197.                         if (m >= n)

  1198.                             sum += adpcm_vb[s->prediction_vq[k][l]][n - 1] *

  1199.                                    subband_samples[k][l][m - n];

  1200.                         else if (s->predictor_history)

  1201.                             sum += adpcm_vb[s->prediction_vq[k][l]][n - 1] *

  1202.                                    s->subband_samples_hist[k][l][m - n + 4];

  1203.                     subband_samples[k][l][m] += sum * 1.0f / 8192;

  1204.                 }

  1205.             }

  1206.         }

  1207. 

  1208.         /*

  1209.          * Decode VQ encoded high frequencies

  1210.          */

  1211.         if (s->subband_activity[k] > s->vq_start_subband[k]) {

  1212.             if (!s->debug_flag & 0x01) {

  1213.                 av_log(s->avctx, AV_LOG_DEBUG,

  1214.                        "Stream with high frequencies VQ coding\n");

  1215.                 s->debug_flag |= 0x01;

  1216.             }

  1217.             s->dcadsp.decode_hf(subband_samples[k], s->high_freq_vq[k],

  1218.                                 high_freq_vq, subsubframe * 8,

  1219.                                 s->scale_factor[k], s->vq_start_subband[k],

  1220.                                 s->subband_activity[k]);

  1221.         }

  1222.     }

  1223. 

  1224.     /* Check for DSYNC after subsubframe */

  1225.     if (s->aspf || subsubframe == s->subsubframes[s->current_subframe] - 1) {

  1226.         if (0xFFFF == get_bits(&s->gb, 16)) {   /* 0xFFFF */

  1227. #ifdef TRACE

  1228.             av_log(s->avctx, AV_LOG_DEBUG, "Got subframe DSYNC\n");

  1229. #endif

  1230.         } else {

  1231.             av_log(s->avctx, AV_LOG_ERROR, "Didn't get subframe DSYNC\n");

  1232.             return AVERROR_INVALIDDATA;

  1233.         }

  1234.     }

  1235. 

  1236.     /* Backup predictor history for adpcm */

  1237.     for (k = base_channel; k < s->prim_channels; k++)

  1238.         for (l = 0; l < s->vq_start_subband[k]; l++)

  1239.             AV_COPY128(s->subband_samples_hist[k][l], &subband_samples[k][l][4]);

  1240. 

  1241.     return 0;

  1242. }

  1243. 

  1244. static int dca_filter_channels(DCAContext *s, int block_index)

  1245. {

  1246.     float (*subband_samples)[DCA_SUBBANDS][8] = s->subband_samples[block_index];

  1247.     int k;

  1248. 

  1249.     /* 32 subbands QMF */

  1250.     for (k = 0; k < s->prim_channels; k++) {

  1251. /*        static float pcm_to_double[8] = { 32768.0, 32768.0, 524288.0, 524288.0,

  1252.                                             0, 8388608.0, 8388608.0 };*/

  1253.         if (s->channel_order_tab[k] >= 0)

  1254.             qmf_32_subbands(s, k, subband_samples[k],

  1255.                             s->samples_chanptr[s->channel_order_tab[k]],

  1256.                             M_SQRT1_2 / 32768.0 /* pcm_to_double[s->source_pcm_res] */);

  1257.     }

  1258. 

  1259.     /* Generate LFE samples for this subsubframe FIXME!!! */

  1260.     if (s->lfe) {

  1261.         lfe_interpolation_fir(s, s->lfe, 2 * s->lfe,

  1262.                               s->lfe_data + 2 * s->lfe * (block_index + 4),

  1263.                               s->samples_chanptr[dca_lfe_index[s->amode]]);

  1264.         /* Outputs 20bits pcm samples */

  1265.     }

  1266. 

  1267.     /* Downmixing to Stereo */

  1268.     if (s->prim_channels + !!s->lfe > 2 &&

  1269.         s->avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {

  1270.         dca_downmix(s->samples_chanptr, s->amode, !!s->lfe, s->downmix_coef,

  1271.                     s->channel_order_tab);

  1272.     }

  1273. 

  1274.     return 0;

  1275. }

  1276. 

  1277. 

  1278. static int dca_subframe_footer(DCAContext *s, int base_channel)

  1279. {

  1280.     int in, out, aux_data_count, aux_data_end, reserved;

  1281.     uint32_t nsyncaux;

  1282. 

  1283.     /*

  1284.      * Unpack optional information

  1285.      */

  1286. 

  1287.     /* presumably optional information only appears in the core? */

  1288.     if (!base_channel) {

  1289.         if (s->timestamp)

  1290.             skip_bits_long(&s->gb, 32);

  1291. 

  1292.         if (s->aux_data) {

  1293.             aux_data_count = get_bits(&s->gb, 6);

  1294. 

  1295.             // align (32-bit)

  1296.             skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);

  1297. 

  1298.             aux_data_end = 8 * aux_data_count + get_bits_count(&s->gb);

  1299. 

  1300.             if ((nsyncaux = get_bits_long(&s->gb, 32)) != DCA_NSYNCAUX) {

  1301.                 av_log(s->avctx, AV_LOG_ERROR, "nSYNCAUX mismatch %#"PRIx32"\n",

  1302.                        nsyncaux);

  1303.                 return AVERROR_INVALIDDATA;

  1304.             }

  1305. 

  1306.             if (get_bits1(&s->gb)) { // bAUXTimeStampFlag

  1307.                 avpriv_request_sample(s->avctx,

  1308.                                       "Auxiliary Decode Time Stamp Flag");

  1309.                 // align (4-bit)

  1310.                 skip_bits(&s->gb, (-get_bits_count(&s->gb)) & 4);

  1311.                 // 44 bits: nMSByte (8), nMarker (4), nLSByte (28), nMarker (4)

  1312.                 skip_bits_long(&s->gb, 44);

  1313.             }

  1314. 

  1315.             if ((s->core_downmix = get_bits1(&s->gb))) {

  1316.                 int am = get_bits(&s->gb, 3);

  1317.                 switch (am) {

  1318.                 case 0:

  1319.                     s->core_downmix_amode = DCA_MONO;

  1320.                     break;

  1321.                 case 1:

  1322.                     s->core_downmix_amode = DCA_STEREO;

  1323.                     break;

  1324.                 case 2:

  1325.                     s->core_downmix_amode = DCA_STEREO_TOTAL;

  1326.                     break;

  1327.                 case 3:

  1328.                     s->core_downmix_amode = DCA_3F;

  1329.                     break;

  1330.                 case 4:

  1331.                     s->core_downmix_amode = DCA_2F1R;

  1332.                     break;

  1333.                 case 5:

  1334.                     s->core_downmix_amode = DCA_2F2R;

  1335.                     break;

  1336.                 case 6:

  1337.                     s->core_downmix_amode = DCA_3F1R;

  1338.                     break;

  1339.                 default:

  1340.                     av_log(s->avctx, AV_LOG_ERROR,

  1341.                            "Invalid mode %d for embedded downmix coefficients\n",

  1342.                            am);

  1343.                     return AVERROR_INVALIDDATA;

  1344.                 }

  1345.                 for (out = 0; out < dca_channels[s->core_downmix_amode]; out++) {

  1346.                     for (in = 0; in < s->prim_channels + !!s->lfe; in++) {

  1347.                         uint16_t tmp = get_bits(&s->gb, 9);

  1348.                         if ((tmp & 0xFF) > 241) {

  1349.                             av_log(s->avctx, AV_LOG_ERROR,

  1350.                                    "Invalid downmix coefficient code %"PRIu16"\n",

  1351.                                    tmp);

  1352.                             return AVERROR_INVALIDDATA;

  1353.                         }

  1354.                         s->core_downmix_codes[in][out] = tmp;

  1355.                     }

  1356.                 }

  1357.             }

  1358. 

  1359.             align_get_bits(&s->gb); // byte align

  1360.             skip_bits(&s->gb, 16);  // nAUXCRC16

  1361. 

  1362.             // additional data (reserved, cf. ETSI TS 102 114 V1.4.1)

  1363.             if ((reserved = (aux_data_end - get_bits_count(&s->gb))) < 0) {

  1364.                  av_log(s->avctx, AV_LOG_ERROR,

  1365.                         "Overread auxiliary data by %d bits\n", -reserved);

  1366.                 return AVERROR_INVALIDDATA;

  1367.             } else if (reserved) {

  1368.                 avpriv_request_sample(s->avctx,

  1369.                                       "Core auxiliary data reserved content");

  1370.                 skip_bits_long(&s->gb, reserved);

  1371.             }

  1372.         }

  1373. 

  1374.         if (s->crc_present && s->dynrange)

  1375.             get_bits(&s->gb, 16);

  1376.     }

  1377. 

  1378.     return 0;

  1379. }

  1380. 

  1381. /**

  1382.  * Decode a dca frame block

  1383.  *

  1384.  * @param s     pointer to the DCAContext

  1385.  */

  1386. 

  1387. static int dca_decode_block(DCAContext *s, int base_channel, int block_index)

  1388. {

  1389.     int ret;

  1390. 

  1391.     /* Sanity check */

  1392.     if (s->current_subframe >= s->subframes) {

  1393.         av_log(s->avctx, AV_LOG_DEBUG, "check failed: %i>%i",

  1394.                s->current_subframe, s->subframes);

  1395.         return AVERROR_INVALIDDATA;

  1396.     }

  1397. 

  1398.     if (!s->current_subsubframe) {

  1399. #ifdef TRACE

  1400.         av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subframe_header\n");

  1401. #endif

  1402.         /* Read subframe header */

  1403.         if ((ret = dca_subframe_header(s, base_channel, block_index)))

  1404.             return ret;

  1405.     }

  1406. 

  1407.     /* Read subsubframe */

  1408. #ifdef TRACE

  1409.     av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subsubframe\n");

  1410. #endif

  1411.     if ((ret = dca_subsubframe(s, base_channel, block_index)))

  1412.         return ret;

  1413. 

  1414.     /* Update state */

  1415.     s->current_subsubframe++;

  1416.     if (s->current_subsubframe >= s->subsubframes[s->current_subframe]) {

  1417.         s->current_subsubframe = 0;

  1418.         s->current_subframe++;

  1419.     }

  1420.     if (s->current_subframe >= s->subframes) {

  1421. #ifdef TRACE

  1422.         av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subframe_footer\n");

  1423. #endif

  1424.         /* Read subframe footer */

  1425.         if ((ret = dca_subframe_footer(s, base_channel)))

  1426.             return ret;

  1427.     }

  1428. 

  1429.     return 0;

  1430. }

  1431. 

  1432. /**

  1433.  * Return the number of channels in an ExSS speaker mask (HD)

  1434.  */

  1435. static int dca_exss_mask2count(int mask)

  1436. {

  1437.     /* count bits that mean speaker pairs twice */

  1438.     return av_popcount(mask) +

  1439.            av_popcount(mask & (DCA_EXSS_CENTER_LEFT_RIGHT      |

  1440.                                DCA_EXSS_FRONT_LEFT_RIGHT       |

  1441.                                DCA_EXSS_FRONT_HIGH_LEFT_RIGHT  |

  1442.                                DCA_EXSS_WIDE_LEFT_RIGHT        |

  1443.                                DCA_EXSS_SIDE_LEFT_RIGHT        |

  1444.                                DCA_EXSS_SIDE_HIGH_LEFT_RIGHT   |

  1445.                                DCA_EXSS_SIDE_REAR_LEFT_RIGHT   |

  1446.                                DCA_EXSS_REAR_LEFT_RIGHT        |

  1447.                                DCA_EXSS_REAR_HIGH_LEFT_RIGHT));

  1448. }

  1449. 

  1450. /**

  1451.  * Skip mixing coefficients of a single mix out configuration (HD)

  1452.  */

  1453. static void dca_exss_skip_mix_coeffs(GetBitContext *gb, int channels, int out_ch)

  1454. {

  1455.     int i;

  1456. 

  1457.     for (i = 0; i < channels; i++) {

  1458.         int mix_map_mask = get_bits(gb, out_ch);

  1459.         int num_coeffs = av_popcount(mix_map_mask);

  1460.         skip_bits_long(gb, num_coeffs * 6);

  1461.     }

  1462. }

  1463. 

  1464. /**

  1465.  * Parse extension substream asset header (HD)

  1466.  */

  1467. static int dca_exss_parse_asset_header(DCAContext *s)

  1468. {

  1469.     int header_pos = get_bits_count(&s->gb);

  1470.     int header_size;

  1471.     int channels;

  1472.     int embedded_stereo = 0;

  1473.     int embedded_6ch    = 0;

  1474.     int drc_code_present;

  1475.     int extensions_mask;

  1476.     int i, j;

  1477. 

  1478.     if (get_bits_left(&s->gb) < 16)

  1479.         return -1;

  1480. 

  1481.     /* We will parse just enough to get to the extensions bitmask with which

  1482.      * we can set the profile value. */

  1483. 

  1484.     header_size = get_bits(&s->gb, 9) + 1;

  1485.     skip_bits(&s->gb, 3); // asset index

  1486. 

  1487.     if (s->static_fields) {

  1488.         if (get_bits1(&s->gb))

  1489.             skip_bits(&s->gb, 4); // asset type descriptor

  1490.         if (get_bits1(&s->gb))

  1491.             skip_bits_long(&s->gb, 24); // language descriptor

  1492. 

  1493.         if (get_bits1(&s->gb)) {

  1494.             /* How can one fit 1024 bytes of text here if the maximum value

  1495.              * for the asset header size field above was 512 bytes? */

  1496.             int text_length = get_bits(&s->gb, 10) + 1;

  1497.             if (get_bits_left(&s->gb) < text_length * 8)

  1498.                 return -1;

  1499.             skip_bits_long(&s->gb, text_length * 8); // info text

  1500.         }

  1501. 

  1502.         skip_bits(&s->gb, 5); // bit resolution - 1

  1503.         skip_bits(&s->gb, 4); // max sample rate code

  1504.         channels = get_bits(&s->gb, 8) + 1;

  1505. 

  1506.         if (get_bits1(&s->gb)) { // 1-to-1 channels to speakers

  1507.             int spkr_remap_sets;

  1508.             int spkr_mask_size = 16;

  1509.             int num_spkrs[7];

  1510. 

  1511.             if (channels > 2)

  1512.                 embedded_stereo = get_bits1(&s->gb);

  1513.             if (channels > 6)

  1514.                 embedded_6ch = get_bits1(&s->gb);

  1515. 

  1516.             if (get_bits1(&s->gb)) {

  1517.                 spkr_mask_size = (get_bits(&s->gb, 2) + 1) << 2;

  1518.                 skip_bits(&s->gb, spkr_mask_size); // spkr activity mask

  1519.             }

  1520. 

  1521.             spkr_remap_sets = get_bits(&s->gb, 3);

  1522. 

  1523.             for (i = 0; i < spkr_remap_sets; i++) {

  1524.                 /* std layout mask for each remap set */

  1525.                 num_spkrs[i] = dca_exss_mask2count(get_bits(&s->gb, spkr_mask_size));

  1526.             }

  1527. 

  1528.             for (i = 0; i < spkr_remap_sets; i++) {

  1529.                 int num_dec_ch_remaps = get_bits(&s->gb, 5) + 1;

  1530.                 if (get_bits_left(&s->gb) < 0)

  1531.                     return -1;

  1532. 

  1533.                 for (j = 0; j < num_spkrs[i]; j++) {

  1534.                     int remap_dec_ch_mask = get_bits_long(&s->gb, num_dec_ch_remaps);

  1535.                     int num_dec_ch = av_popcount(remap_dec_ch_mask);

  1536.                     skip_bits_long(&s->gb, num_dec_ch * 5); // remap codes

  1537.                 }

  1538.             }

  1539. 

  1540.         } else {

  1541.             skip_bits(&s->gb, 3); // representation type

  1542.         }

  1543.     }

  1544. 

  1545.     drc_code_present = get_bits1(&s->gb);

  1546.     if (drc_code_present)

  1547.         get_bits(&s->gb, 8); // drc code

  1548. 

  1549.     if (get_bits1(&s->gb))

  1550.         skip_bits(&s->gb, 5); // dialog normalization code

  1551. 

  1552.     if (drc_code_present && embedded_stereo)

  1553.         get_bits(&s->gb, 8); // drc stereo code

  1554. 

  1555.     if (s->mix_metadata && get_bits1(&s->gb)) {

  1556.         skip_bits(&s->gb, 1); // external mix

  1557.         skip_bits(&s->gb, 6); // post mix gain code

  1558. 

  1559.         if (get_bits(&s->gb, 2) != 3) // mixer drc code

  1560.             skip_bits(&s->gb, 3); // drc limit

  1561.         else

  1562.             skip_bits(&s->gb, 8); // custom drc code

  1563. 

  1564.         if (get_bits1(&s->gb)) // channel specific scaling

  1565.             for (i = 0; i < s->num_mix_configs; i++)

  1566.                 skip_bits_long(&s->gb, s->mix_config_num_ch[i] * 6); // scale codes

  1567.         else

  1568.             skip_bits_long(&s->gb, s->num_mix_configs * 6); // scale codes

  1569. 

  1570.         for (i = 0; i < s->num_mix_configs; i++) {

  1571.             if (get_bits_left(&s->gb) < 0)

  1572.                 return -1;

  1573.             dca_exss_skip_mix_coeffs(&s->gb, channels, s->mix_config_num_ch[i]);

  1574.             if (embedded_6ch)

  1575.                 dca_exss_skip_mix_coeffs(&s->gb, 6, s->mix_config_num_ch[i]);

  1576.             if (embedded_stereo)

  1577.                 dca_exss_skip_mix_coeffs(&s->gb, 2, s->mix_config_num_ch[i]);

  1578.         }

  1579.     }

  1580. 

  1581.     switch (get_bits(&s->gb, 2)) {

  1582.     case 0: extensions_mask = get_bits(&s->gb, 12); break;

  1583.     case 1: extensions_mask = DCA_EXT_EXSS_XLL;     break;

  1584.     case 2: extensions_mask = DCA_EXT_EXSS_LBR;     break;

  1585.     case 3: extensions_mask = 0; /* aux coding */   break;

  1586.     }

  1587. 

  1588.     /* not parsed further, we were only interested in the extensions mask */

  1589. 

  1590.     if (get_bits_left(&s->gb) < 0)

  1591.         return -1;

  1592. 

  1593.     if (get_bits_count(&s->gb) - header_pos > header_size * 8) {

  1594.         av_log(s->avctx, AV_LOG_WARNING, "Asset header size mismatch.\n");

  1595.         return -1;

  1596.     }

  1597.     skip_bits_long(&s->gb, header_pos + header_size * 8 - get_bits_count(&s->gb));

  1598. 

  1599.     if (extensions_mask & DCA_EXT_EXSS_XLL)

  1600.         s->profile = FF_PROFILE_DTS_HD_MA;

  1601.     else if (extensions_mask & (DCA_EXT_EXSS_XBR | DCA_EXT_EXSS_X96 |

  1602.                                 DCA_EXT_EXSS_XXCH))

  1603.         s->profile = FF_PROFILE_DTS_HD_HRA;

  1604. 

  1605.     if (!(extensions_mask & DCA_EXT_CORE))

  1606.         av_log(s->avctx, AV_LOG_WARNING, "DTS core detection mismatch.\n");

  1607.     if ((extensions_mask & DCA_CORE_EXTS) != s->core_ext_mask)

  1608.         av_log(s->avctx, AV_LOG_WARNING,

  1609.                "DTS extensions detection mismatch (%d, %d)\n",

  1610.                extensions_mask & DCA_CORE_EXTS, s->core_ext_mask);

  1611. 

  1612.     return 0;

  1613. }

  1614. 

  1615. /**

  1616.  * Parse extension substream header (HD)

  1617.  */

  1618. static void dca_exss_parse_header(DCAContext *s)

  1619. {

  1620.     int ss_index;

  1621.     int blownup;

  1622.     int num_audiop = 1;

  1623.     int num_assets = 1;

  1624.     int active_ss_mask[8];

  1625.     int i, j;

  1626. 

  1627.     if (get_bits_left(&s->gb) < 52)

  1628.         return;

  1629. 

  1630.     skip_bits(&s->gb, 8); // user data

  1631.     ss_index = get_bits(&s->gb, 2);

  1632. 

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

  1634.     skip_bits(&s->gb,  8 + 4 * blownup); // header_size

  1635.     skip_bits(&s->gb, 16 + 4 * blownup); // hd_size

  1636. 

  1637.     s->static_fields = get_bits1(&s->gb);

  1638.     if (s->static_fields) {

  1639.         skip_bits(&s->gb, 2); // reference clock code

  1640.         skip_bits(&s->gb, 3); // frame duration code

  1641. 

  1642.         if (get_bits1(&s->gb))

  1643.             skip_bits_long(&s->gb, 36); // timestamp

  1644. 

  1645.         /* a single stream can contain multiple audio assets that can be

  1646.          * combined to form multiple audio presentations */

  1647. 

  1648.         num_audiop = get_bits(&s->gb, 3) + 1;

  1649.         if (num_audiop > 1) {

  1650.             avpriv_request_sample(s->avctx,

  1651.                                   "Multiple DTS-HD audio presentations");

  1652.             /* ignore such streams for now */

  1653.             return;

  1654.         }

  1655. 

  1656.         num_assets = get_bits(&s->gb, 3) + 1;

  1657.         if (num_assets > 1) {

  1658.             avpriv_request_sample(s->avctx, "Multiple DTS-HD audio assets");

  1659.             /* ignore such streams for now */

  1660.             return;

  1661.         }

  1662. 

  1663.         for (i = 0; i < num_audiop; i++)

  1664.             active_ss_mask[i] = get_bits(&s->gb, ss_index + 1);

  1665. 

  1666.         for (i = 0; i < num_audiop; i++)

  1667.             for (j = 0; j <= ss_index; j++)

  1668.                 if (active_ss_mask[i] & (1 << j))

  1669.                     skip_bits(&s->gb, 8); // active asset mask

  1670. 

  1671.         s->mix_metadata = get_bits1(&s->gb);

  1672.         if (s->mix_metadata) {

  1673.             int mix_out_mask_size;

  1674. 

  1675.             skip_bits(&s->gb, 2); // adjustment level

  1676.             mix_out_mask_size  = (get_bits(&s->gb, 2) + 1) << 2;

  1677.             s->num_mix_configs =  get_bits(&s->gb, 2) + 1;

  1678. 

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

  1680.                 int mix_out_mask        = get_bits(&s->gb, mix_out_mask_size);

  1681.                 s->mix_config_num_ch[i] = dca_exss_mask2count(mix_out_mask);

  1682.             }

  1683.         }

  1684.     }

  1685. 

  1686.     for (i = 0; i < num_assets; i++)

  1687.         skip_bits_long(&s->gb, 16 + 4 * blownup);  // asset size

  1688. 

  1689.     for (i = 0; i < num_assets; i++) {

  1690.         if (dca_exss_parse_asset_header(s))

  1691.             return;

  1692.     }

  1693. 

  1694.     /* not parsed further, we were only interested in the extensions mask

  1695.      * from the asset header */

  1696. }

  1697. 

  1698. static float dca_dmix_code(unsigned code)

  1699. {

  1700.     int sign = (code >> 8) - 1;

  1701.     code &= 0xff;

  1702.     return ldexpf((dca_dmixtable[code] ^ sign) - sign, -15);

  1703. }

  1704. 

  1705. /**

  1706.  * Main frame decoding function

  1707.  * FIXME add arguments

  1708.  */

  1709. static int dca_decode_frame(AVCodecContext *avctx, void *data,

  1710.                             int *got_frame_ptr, AVPacket *avpkt)

  1711. {

  1712.     AVFrame *frame     = data;

  1713.     const uint8_t *buf = avpkt->data;

  1714.     int buf_size = avpkt->size;

  1715. 

  1716.     int lfe_samples;

  1717.     int num_core_channels = 0;

  1718.     int i, ret;

  1719.     float  **samples_flt;

  1720.     DCAContext *s = avctx->priv_data;

  1721.     int channels, full_channels;

  1722.     int core_ss_end;

  1723. 

  1724. 

  1725.     s->xch_present = 0;

  1726. 

  1727.     s->dca_buffer_size = ff_dca_convert_bitstream(buf, buf_size, s->dca_buffer,

  1728.                                                   DCA_MAX_FRAME_SIZE + DCA_MAX_EXSS_HEADER_SIZE);

  1729.     if (s->dca_buffer_size == AVERROR_INVALIDDATA) {

  1730.         av_log(avctx, AV_LOG_ERROR, "Not a valid DCA frame\n");

  1731.         return AVERROR_INVALIDDATA;

  1732.     }

  1733. 

  1734.     if ((ret = dca_parse_frame_header(s)) < 0) {

  1735.         //seems like the frame is corrupt, try with the next one

  1736.         return ret;

  1737.     }

  1738.     //set AVCodec values with parsed data

  1739.     avctx->sample_rate = s->sample_rate;

  1740.     avctx->bit_rate    = s->bit_rate;

  1741. 

  1742.     s->profile = FF_PROFILE_DTS;

  1743. 

  1744.     for (i = 0; i < (s->sample_blocks / 8); i++) {

  1745.         if ((ret = dca_decode_block(s, 0, i))) {

  1746.             av_log(avctx, AV_LOG_ERROR, "error decoding block\n");

  1747.             return ret;

  1748.         }

  1749.     }

  1750. 

  1751.     /* record number of core channels incase less than max channels are requested */

  1752.     num_core_channels = s->prim_channels;

  1753. 

  1754.     if (s->ext_coding)

  1755.         s->core_ext_mask = dca_ext_audio_descr_mask[s->ext_descr];

  1756.     else

  1757.         s->core_ext_mask = 0;

  1758. 

  1759.     core_ss_end = FFMIN(s->frame_size, s->dca_buffer_size) * 8;

  1760. 

  1761.     /* only scan for extensions if ext_descr was unknown or indicated a

  1762.      * supported XCh extension */

  1763.     if (s->core_ext_mask < 0 || s->core_ext_mask & DCA_EXT_XCH) {

  1764. 

  1765.         /* if ext_descr was unknown, clear s->core_ext_mask so that the

  1766.          * extensions scan can fill it up */

  1767.         s->core_ext_mask = FFMAX(s->core_ext_mask, 0);

  1768. 

  1769.         /* extensions start at 32-bit boundaries into bitstream */

  1770.         skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);

  1771. 

  1772.         while (core_ss_end - get_bits_count(&s->gb) >= 32) {

  1773.             uint32_t bits = get_bits_long(&s->gb, 32);

  1774. 

  1775.             switch (bits) {

  1776.             case 0x5a5a5a5a: {

  1777.                 int ext_amode, xch_fsize;

  1778. 

  1779.                 s->xch_base_channel = s->prim_channels;

  1780. 

  1781.                 /* validate sync word using XCHFSIZE field */

  1782.                 xch_fsize = show_bits(&s->gb, 10);

  1783.                 if ((s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize) &&

  1784.                     (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize + 1))

  1785.                     continue;

  1786. 

  1787.                 /* skip length-to-end-of-frame field for the moment */

  1788.                 skip_bits(&s->gb, 10);

  1789. 

  1790.                 s->core_ext_mask |= DCA_EXT_XCH;

  1791. 

  1792.                 /* extension amode(number of channels in extension) should be 1 */

  1793.                 /* AFAIK XCh is not used for more channels */

  1794.                 if ((ext_amode = get_bits(&s->gb, 4)) != 1) {

  1795.                     av_log(avctx, AV_LOG_ERROR, "XCh extension amode %d not"

  1796.                            " supported!\n", ext_amode);

  1797.                     continue;

  1798.                 }

  1799. 

  1800.                 /* much like core primary audio coding header */

  1801.                 dca_parse_audio_coding_header(s, s->xch_base_channel);

  1802. 

  1803.                 for (i = 0; i < (s->sample_blocks / 8); i++)

  1804.                     if ((ret = dca_decode_block(s, s->xch_base_channel, i))) {

  1805.                         av_log(avctx, AV_LOG_ERROR, "error decoding XCh extension\n");

  1806.                         continue;

  1807.                     }

  1808. 

  1809.                 s->xch_present = 1;

  1810.                 break;

  1811.             }

  1812.             case 0x47004a03:

  1813.                 /* XXCh: extended channels */

  1814.                 /* usually found either in core or HD part in DTS-HD HRA streams,

  1815.                  * but not in DTS-ES which contains XCh extensions instead */

  1816.                 s->core_ext_mask |= DCA_EXT_XXCH;

  1817.                 break;

  1818. 

  1819.             case 0x1d95f262: {

  1820.                 int fsize96 = show_bits(&s->gb, 12) + 1;

  1821.                 if (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + fsize96)

  1822.                     continue;

  1823. 

  1824.                 av_log(avctx, AV_LOG_DEBUG, "X96 extension found at %d bits\n",

  1825.                        get_bits_count(&s->gb));

  1826.                 skip_bits(&s->gb, 12);

  1827.                 av_log(avctx, AV_LOG_DEBUG, "FSIZE96 = %d bytes\n", fsize96);

  1828.                 av_log(avctx, AV_LOG_DEBUG, "REVNO = %d\n", get_bits(&s->gb, 4));

  1829. 

  1830.                 s->core_ext_mask |= DCA_EXT_X96;

  1831.                 break;

  1832.             }

  1833.             }

  1834. 

  1835.             skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);

  1836.         }

  1837.     } else {

  1838.         /* no supported extensions, skip the rest of the core substream */

  1839.         skip_bits_long(&s->gb, core_ss_end - get_bits_count(&s->gb));

  1840.     }

  1841. 

  1842.     if (s->core_ext_mask & DCA_EXT_X96)

  1843.         s->profile = FF_PROFILE_DTS_96_24;

  1844.     else if (s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH))

  1845.         s->profile = FF_PROFILE_DTS_ES;

  1846. 

  1847.     /* check for ExSS (HD part) */

  1848.     if (s->dca_buffer_size - s->frame_size > 32 &&

  1849.         get_bits_long(&s->gb, 32) == DCA_HD_MARKER)

  1850.         dca_exss_parse_header(s);

  1851. 

  1852.     avctx->profile = s->profile;

  1853. 

  1854.     full_channels = channels = s->prim_channels + !!s->lfe;

  1855. 

  1856.     if (s->amode < 16) {

  1857.         avctx->channel_layout = dca_core_channel_layout[s->amode];

  1858. 

  1859.         if (s->prim_channels + !!s->lfe > 2 &&

  1860.             avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {

  1861.             /*

  1862.              * Neither the core's auxiliary data nor our default tables contain

  1863.              * downmix coefficients for the additional channel coded in the XCh

  1864.              * extension, so when we're doing a Stereo downmix, don't decode it.

  1865.              */

  1866.             s->xch_disable = 1;

  1867.         }

  1868. 

  1869. #if FF_API_REQUEST_CHANNELS

  1870. FF_DISABLE_DEPRECATION_WARNINGS

  1871.         if (s->xch_present && !s->xch_disable &&

  1872.             (!avctx->request_channels ||

  1873.              avctx->request_channels > num_core_channels + !!s->lfe)) {

  1874. FF_ENABLE_DEPRECATION_WARNINGS

  1875. #else

  1876.         if (s->xch_present && !s->xch_disable) {

  1877. #endif

  1878.             avctx->channel_layout |= AV_CH_BACK_CENTER;

  1879.             if (s->lfe) {

  1880.                 avctx->channel_layout |= AV_CH_LOW_FREQUENCY;

  1881.                 s->channel_order_tab = dca_channel_reorder_lfe_xch[s->amode];

  1882.             } else {

  1883.                 s->channel_order_tab = dca_channel_reorder_nolfe_xch[s->amode];

  1884.             }

  1885.         } else {

  1886.             channels = num_core_channels + !!s->lfe;

  1887.             s->xch_present = 0; /* disable further xch processing */

  1888.             if (s->lfe) {

  1889.                 avctx->channel_layout |= AV_CH_LOW_FREQUENCY;

  1890.                 s->channel_order_tab = dca_channel_reorder_lfe[s->amode];

  1891.             } else

  1892.                 s->channel_order_tab = dca_channel_reorder_nolfe[s->amode];

  1893.         }

  1894. 

  1895.         if (channels > !!s->lfe &&

  1896.             s->channel_order_tab[channels - 1 - !!s->lfe] < 0)

  1897.             return AVERROR_INVALIDDATA;

  1898. 

  1899.         if (num_core_channels + !!s->lfe > 2 &&

  1900.             avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {

  1901.             channels = 2;

  1902.             s->output = s->prim_channels == 2 ? s->amode : DCA_STEREO;

  1903.             avctx->channel_layout = AV_CH_LAYOUT_STEREO;

  1904. 

  1905.             /* Stereo downmix coefficients

  1906.              *

  1907.              * The decoder can only downmix to 2-channel, so we need to ensure

  1908.              * embedded downmix coefficients are actually targeting 2-channel.

  1909.              */

  1910.             if (s->core_downmix && (s->core_downmix_amode == DCA_STEREO ||

  1911.                                     s->core_downmix_amode == DCA_STEREO_TOTAL)) {

  1912.                 for (i = 0; i < num_core_channels + !!s->lfe; i++) {

  1913.                     /* Range checked earlier */

  1914.                     s->downmix_coef[i][0] = dca_dmix_code(s->core_downmix_codes[i][0]);

  1915.                     s->downmix_coef[i][1] = dca_dmix_code(s->core_downmix_codes[i][1]);

  1916.                 }

  1917.                 s->output = s->core_downmix_amode;

  1918.             } else {

  1919.                 int am = s->amode & DCA_CHANNEL_MASK;

  1920.                 if (am >= FF_ARRAY_ELEMS(dca_default_coeffs)) {

  1921.                     av_log(s->avctx, AV_LOG_ERROR,

  1922.                            "Invalid channel mode %d\n", am);

  1923.                     return AVERROR_INVALIDDATA;

  1924.                 }

  1925.                 if (num_core_channels + !!s->lfe >

  1926.                     FF_ARRAY_ELEMS(dca_default_coeffs[0])) {

  1927.                     avpriv_request_sample(s->avctx, "Downmixing %d channels",

  1928.                                           s->prim_channels + !!s->lfe);

  1929.                     return AVERROR_PATCHWELCOME;

  1930.                 }

  1931.                 for (i = 0; i < num_core_channels + !!s->lfe; i++) {

  1932.                     s->downmix_coef[i][0] = dca_default_coeffs[am][i][0];

  1933.                     s->downmix_coef[i][1] = dca_default_coeffs[am][i][1];

  1934.                 }

  1935.             }

  1936.             av_dlog(s->avctx, "Stereo downmix coeffs:\n");

  1937.             for (i = 0; i < num_core_channels + !!s->lfe; i++) {

  1938.                 av_dlog(s->avctx, "L, input channel %d = %f\n", i,

  1939.                         s->downmix_coef[i][0]);

  1940.                 av_dlog(s->avctx, "R, input channel %d = %f\n", i,

  1941.                         s->downmix_coef[i][1]);

  1942.             }

  1943.             av_dlog(s->avctx, "\n");

  1944.         }

  1945.     } else {

  1946.         av_log(avctx, AV_LOG_ERROR, "Non standard configuration %d !\n", s->amode);

  1947.         return AVERROR_INVALIDDATA;

  1948.     }

  1949.     avctx->channels = channels;

  1950. 

  1951.     /* get output buffer */

  1952.     frame->nb_samples = 256 * (s->sample_blocks / 8);

  1953.     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {

  1954.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1955.         return ret;

  1956.     }

  1957.     samples_flt = (float **)frame->extended_data;

  1958. 

  1959.     /* allocate buffer for extra channels if downmixing */

  1960.     if (avctx->channels < full_channels) {

  1961.         ret = av_samples_get_buffer_size(NULL, full_channels - channels,

  1962.                                          frame->nb_samples,

  1963.                                          avctx->sample_fmt, 0);

  1964.         if (ret < 0)

  1965.             return ret;

  1966. 

  1967.         av_fast_malloc(&s->extra_channels_buffer,

  1968.                        &s->extra_channels_buffer_size, ret);

  1969.         if (!s->extra_channels_buffer)

  1970.             return AVERROR(ENOMEM);

  1971. 

  1972.         ret = av_samples_fill_arrays((uint8_t **)s->extra_channels, NULL,

  1973.                                      s->extra_channels_buffer,

  1974.                                      full_channels - channels,

  1975.                                      frame->nb_samples, avctx->sample_fmt, 0);

  1976.         if (ret < 0)

  1977.             return ret;

  1978.     }

  1979. 

  1980.     /* filter to get final output */

  1981.     for (i = 0; i < (s->sample_blocks / 8); i++) {

  1982.         int ch;

  1983. 

  1984.         for (ch = 0; ch < channels; ch++)

  1985.             s->samples_chanptr[ch] = samples_flt[ch] + i * 256;

  1986.         for (; ch < full_channels; ch++)

  1987.             s->samples_chanptr[ch] = s->extra_channels[ch - channels] + i * 256;

  1988. 

  1989.         dca_filter_channels(s, i);

  1990. 

  1991.         /* If this was marked as a DTS-ES stream we need to subtract back- */

  1992.         /* channel from SL & SR to remove matrixed back-channel signal */

  1993.         if ((s->source_pcm_res & 1) && s->xch_present) {

  1994.             float *back_chan = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel]];

  1995.             float *lt_chan   = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel - 2]];

  1996.             float *rt_chan   = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel - 1]];

  1997.             s->fdsp.vector_fmac_scalar(lt_chan, back_chan, -M_SQRT1_2, 256);

  1998.             s->fdsp.vector_fmac_scalar(rt_chan, back_chan, -M_SQRT1_2, 256);

  1999.         }

  2000.     }

  2001. 

  2002.     /* update lfe history */

  2003.     lfe_samples = 2 * s->lfe * (s->sample_blocks / 8);

  2004.     for (i = 0; i < 2 * s->lfe * 4; i++)

  2005.         s->lfe_data[i] = s->lfe_data[i + lfe_samples];

  2006. 

  2007.     /* AVMatrixEncoding

  2008.      *

  2009.      * DCA_STEREO_TOTAL (Lt/Rt) is equivalent to Dolby Surround */

  2010.     ret = ff_side_data_update_matrix_encoding(frame,

  2011.                                               (s->output & ~DCA_LFE) == DCA_STEREO_TOTAL ?

  2012.                                               AV_MATRIX_ENCODING_DOLBY : AV_MATRIX_ENCODING_NONE);

  2013.     if (ret < 0)

  2014.         return ret;

  2015. 

  2016.     *got_frame_ptr = 1;

  2017. 

  2018.     return buf_size;

  2019. }

  2020. 

  2021. 

  2022. 

  2023. /**

  2024.  * DCA initialization

  2025.  *

  2026.  * @param avctx     pointer to the AVCodecContext

  2027.  */

  2028. 

  2029. static av_cold int dca_decode_init(AVCodecContext *avctx)

  2030. {

  2031.     DCAContext *s = avctx->priv_data;

  2032. 

  2033.     s->avctx = avctx;

  2034.     dca_init_vlcs();

  2035. 

  2036.     avpriv_float_dsp_init(&s->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);

  2037.     ff_mdct_init(&s->imdct, 6, 1, 1.0);

  2038.     ff_synth_filter_init(&s->synth);

  2039.     ff_dcadsp_init(&s->dcadsp);

  2040.     ff_fmt_convert_init(&s->fmt_conv, avctx);

  2041. 

  2042.     avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;

  2043. 

  2044.     /* allow downmixing to stereo */

  2045. #if FF_API_REQUEST_CHANNELS

  2046. FF_DISABLE_DEPRECATION_WARNINGS

  2047.     if (avctx->request_channels == 2)

  2048.         avctx->request_channel_layout = AV_CH_LAYOUT_STEREO;

  2049. FF_ENABLE_DEPRECATION_WARNINGS

  2050. #endif

  2051.     if (avctx->channels > 2 &&

  2052.         avctx->request_channel_layout == AV_CH_LAYOUT_STEREO)

  2053.         avctx->channels = 2;

  2054. 

  2055.     return 0;

  2056. }

  2057. 

  2058. static av_cold int dca_decode_end(AVCodecContext *avctx)

  2059. {

  2060.     DCAContext *s = avctx->priv_data;

  2061.     ff_mdct_end(&s->imdct);

  2062.     av_freep(&s->extra_channels_buffer);

  2063.     return 0;

  2064. }

  2065. 

  2066. static const AVProfile profiles[] = {

  2067.     { FF_PROFILE_DTS,        "DTS"        },

  2068.     { FF_PROFILE_DTS_ES,     "DTS-ES"     },

  2069.     { FF_PROFILE_DTS_96_24,  "DTS 96/24"  },

  2070.     { FF_PROFILE_DTS_HD_HRA, "DTS-HD HRA" },

  2071.     { FF_PROFILE_DTS_HD_MA,  "DTS-HD MA"  },

  2072.     { FF_PROFILE_UNKNOWN },

  2073. };

  2074. 

  2075. static const AVOption options[] = {

  2076.     { "disable_xch", "disable decoding of the XCh extension", offsetof(DCAContext, xch_disable), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM|AV_OPT_FLAG_AUDIO_PARAM },

  2077.     { NULL },

  2078. };

  2079. 

  2080. static const AVClass dca_decoder_class = {

  2081.     .class_name = "DCA decoder",

  2082.     .item_name  = av_default_item_name,

  2083.     .option     = options,

  2084.     .version    = LIBAVUTIL_VERSION_INT,

  2085. };

  2086. 

  2087. AVCodec ff_dca_decoder = {

  2088.     .name            = "dca",

  2089.     .long_name       = NULL_IF_CONFIG_SMALL("DCA (DTS Coherent Acoustics)"),

  2090.     .type            = AVMEDIA_TYPE_AUDIO,

  2091.     .id              = AV_CODEC_ID_DTS,

  2092.     .priv_data_size  = sizeof(DCAContext),

  2093.     .init            = dca_decode_init,

  2094.     .decode          = dca_decode_frame,

  2095.     .close           = dca_decode_end,

  2096.     .capabilities    = CODEC_CAP_CHANNEL_CONF | CODEC_CAP_DR1,

  2097.     .sample_fmts     = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,

  2098.                                                        AV_SAMPLE_FMT_NONE },

  2099.     .profiles        = NULL_IF_CONFIG_SMALL(profiles),

  2100.     .priv_class      = &dca_decoder_class,

  2101. };