falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
8381 Commits
32 Branches
821MB
Tree: cc58300e30
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'cc58300e30'
${ noResults }
FFmpeg/libavcodec/mpc.c

362 lines
12KB
Raw Blame History 

  1. /*

  2.  * Musepack decoder

  3.  * Copyright (c) 2006 Konstantin Shishkov

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  *

  21.  */

  22. 

  23. /**

  24.  * @file mpc.c Musepack decoder

  25.  * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples

  26.  * divided into 32 subbands.

  27.  */

  28. 

  29. #include "avcodec.h"

  30. #include "bitstream.h"

  31. #include "dsputil.h"

  32. 

  33. #ifdef CONFIG_MPEGAUDIO_HP

  34. #define USE_HIGHPRECISION

  35. #endif

  36. #include "mpegaudio.h"

  37. 

  38. #include "mpcdata.h"

  39. 

  40. #define BANDS            32

  41. #define SAMPLES_PER_BAND 36

  42. #define MPC_FRAME_SIZE   (BANDS * SAMPLES_PER_BAND)

  43. 

  44. static VLC scfi_vlc, dscf_vlc, hdr_vlc, quant_vlc[MPC7_QUANT_VLC_TABLES][2];

  45. 

  46. static DECLARE_ALIGNED_16(MPA_INT, mpa_window[512]);

  47. 

  48. typedef struct {

  49.     DSPContext dsp;

  50.     int IS, MSS, gapless;

  51.     int lastframelen, bands;

  52.     int oldDSCF[2][BANDS];

  53.     int rnd;

  54.     int frames_to_skip;

  55.     /* for synthesis */

  56.     DECLARE_ALIGNED_16(MPA_INT, synth_buf[MPA_MAX_CHANNELS][512*2]);

  57.     int synth_buf_offset[MPA_MAX_CHANNELS];

  58.     DECLARE_ALIGNED_16(int32_t, sb_samples[MPA_MAX_CHANNELS][36][SBLIMIT]);

  59. } MPCContext;

  60. 

  61. /** Subband structure - hold all variables for each subband */

  62. typedef struct {

  63.     int msf; ///< mid-stereo flag

  64.     int res[2];

  65.     int scfi[2];

  66.     int scf_idx[2][3];

  67.     int Q[2];

  68. }Band;

  69. 

  70. static int mpc7_decode_init(AVCodecContext * avctx)

  71. {

  72.     int i, j;

  73.     MPCContext *c = avctx->priv_data;

  74.     GetBitContext gb;

  75.     uint8_t buf[16];

  76.     float f1=1.20050805774840750476 * 256;

  77.     static int vlc_inited = 0;

  78. 

  79.     if(avctx->extradata_size < 16){

  80.         av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);

  81.         return -1;

  82.     }

  83.     memset(c->oldDSCF, 0, sizeof(c->oldDSCF));

  84.     c->rnd = 0xDEADBEEF;

  85.     dsputil_init(&c->dsp, avctx);

  86.     c->dsp.bswap_buf(buf, avctx->extradata, 4);

  87.     ff_mpa_synth_init(mpa_window);

  88.     init_get_bits(&gb, buf, 128);

  89. 

  90.     c->IS = get_bits1(&gb);

  91.     c->MSS = get_bits1(&gb);

  92.     c->bands = get_bits(&gb, 6);

  93.     if(c->bands >= BANDS){

  94.         av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->bands);

  95.         return -1;

  96.     }

  97.     skip_bits(&gb, 88);

  98.     c->gapless = get_bits1(&gb);

  99.     c->lastframelen = get_bits(&gb, 11);

  100.     av_log(avctx, AV_LOG_DEBUG, "IS: %d, MSS: %d, TG: %d, LFL: %d, bands: %d\n",

  101.             c->IS, c->MSS, c->gapless, c->lastframelen, c->bands);

  102.     c->frames_to_skip = 0;

  103. 

  104.     if(vlc_inited) return 0;

  105.     av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");

  106.     if(init_vlc(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE,

  107.                 &mpc7_scfi[1], 2, 1,

  108.                 &mpc7_scfi[0], 2, 1, INIT_VLC_USE_STATIC)){

  109.         av_log(avctx, AV_LOG_ERROR, "Cannot init SCFI VLC\n");

  110.         return -1;

  111.     }

  112.     if(init_vlc(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE,

  113.                 &mpc7_dscf[1], 2, 1,

  114.                 &mpc7_dscf[0], 2, 1, INIT_VLC_USE_STATIC)){

  115.         av_log(avctx, AV_LOG_ERROR, "Cannot init DSCF VLC\n");

  116.         return -1;

  117.     }

  118.     if(init_vlc(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE,

  119.                 &mpc7_hdr[1], 2, 1,

  120.                 &mpc7_hdr[0], 2, 1, INIT_VLC_USE_STATIC)){

  121.         av_log(avctx, AV_LOG_ERROR, "Cannot init HDR VLC\n");

  122.         return -1;

  123.     }

  124.     for(i = 0; i < MPC7_QUANT_VLC_TABLES; i++){

  125.         for(j = 0; j < 2; j++){

  126.             if(init_vlc(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i],

  127.                         &mpc7_quant_vlc[i][j][1], 4, 2,

  128.                         &mpc7_quant_vlc[i][j][0], 4, 2, INIT_VLC_USE_STATIC)){

  129.                 av_log(avctx, AV_LOG_ERROR, "Cannot init QUANT VLC %i,%i\n",i,j);

  130.                 return -1;

  131.             }

  132.         }

  133.     }

  134.     vlc_inited = 1;

  135.     return 0;

  136. }

  137. 

  138. // XXX replace with something better

  139. static int av_always_inline mpc_rnd(MPCContext *c)

  140. {

  141.     c->rnd = c->rnd * 27 + 17;

  142.     return c->rnd;

  143. }

  144. 

  145. /**

  146.  * Process decoded Musepack data and produce PCM

  147.  * @todo make it available for MPC8 and MPC6

  148.  */

  149. static void mpc_synth(MPCContext *c, int16_t *out)

  150. {

  151.     int dither_state = 0;

  152.     int i, ch;

  153.     OUT_INT samples[MPA_MAX_CHANNELS * MPA_FRAME_SIZE], *samples_ptr;

  154. 

  155.     for(ch = 0;  ch < 2; ch++){

  156.         samples_ptr = samples + ch;

  157.         for(i = 0; i < SAMPLES_PER_BAND; i++) {

  158.             ff_mpa_synth_filter(c->synth_buf[ch], &(c->synth_buf_offset[ch]),

  159.                                 mpa_window, &dither_state,

  160.                                 samples_ptr, 2,

  161.                                 c->sb_samples[ch][i]);

  162.             samples_ptr += 64;

  163.         }

  164.     }

  165.     for(i = 0; i < MPC_FRAME_SIZE*2; i++)

  166.         *out++=samples[i];

  167. }

  168. 

  169. /**

  170.  * Fill samples for given subband

  171.  */

  172. static void inline idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst)

  173. {

  174.     int i, i1, t;

  175.     switch(idx){

  176.     case -1:

  177.         for(i = 0; i < SAMPLES_PER_BAND; i++){

  178.             t = mpc_rnd(c);

  179.             *dst++ = ((t>>24)& 0xFF) + ((t>>16) & 0xFF) + ((t>>8) & 0xFF) + (t & 0xFF) - 510;

  180.         }

  181.     case 1:

  182.         i1 = get_bits1(gb);

  183.         for(i = 0; i < SAMPLES_PER_BAND/3; i++){

  184.             t = get_vlc2(gb, quant_vlc[0][i1].table, 9, 2);

  185.             *dst++ = mpc_idx30[t];

  186.             *dst++ = mpc_idx31[t];

  187.             *dst++ = mpc_idx32[t];

  188.         }

  189.         break;

  190.     case 2:

  191.         i1 = get_bits1(gb);

  192.         for(i = 0; i < SAMPLES_PER_BAND/2; i++){

  193.             t = get_vlc2(gb, quant_vlc[1][i1].table, 9, 2);

  194.             *dst++ = mpc_idx50[t];

  195.             *dst++ = mpc_idx51[t];

  196.         }

  197.         break;

  198.     case  3: case  4: case  5: case  6: case  7:

  199.         i1 = get_bits1(gb);

  200.         for(i = 0; i < SAMPLES_PER_BAND; i++)

  201.             *dst++ = get_vlc2(gb, quant_vlc[idx-1][i1].table, 9, 2) - mpc7_quant_vlc_off[idx-1];

  202.         break;

  203.     case  8: case  9: case 10: case 11: case 12:

  204.     case 13: case 14: case 15: case 16: case 17:

  205.         t = (1 << (idx - 2)) - 1;

  206.         for(i = 0; i < SAMPLES_PER_BAND; i++)

  207.             *dst++ = get_bits(gb, idx - 1) - t;

  208.         break;

  209.     default: // case 0 and -2..-17

  210.         return;

  211.     }

  212. }

  213. 

  214. static int mpc7_decode_frame(AVCodecContext * avctx,

  215.                             void *data, int *data_size,

  216.                             uint8_t * buf, int buf_size)

  217. {

  218.     MPCContext *c = avctx->priv_data;

  219.     GetBitContext gb;

  220.     uint8_t *bits;

  221.     int i, j, ch, t;

  222.     int mb = -1;

  223.     Band bands[BANDS];

  224.     int Q[2][MPC_FRAME_SIZE];

  225.     int off;

  226.     float mul;

  227.     int bits_used, bits_avail;

  228. 

  229.     memset(bands, 0, sizeof(bands));

  230.     if(buf_size <= 4){

  231.         av_log(avctx, AV_LOG_ERROR, "Too small buffer passed (%i bytes)\n", buf_size);

  232.     }

  233. 

  234.     bits = av_malloc(((buf_size - 1) & ~3) + FF_INPUT_BUFFER_PADDING_SIZE);

  235.     c->dsp.bswap_buf(bits, buf + 4, (buf_size - 4) >> 2);

  236.     init_get_bits(&gb, bits, (buf_size - 4)* 8);

  237.     skip_bits(&gb, buf[0]);

  238. 

  239.     /* read subband indexes */

  240.     for(i = 0; i <= c->bands; i++){

  241.         for(ch = 0; ch < 2; ch++){

  242.             if(i) t = get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) - 5;

  243.             if(!i || (t == 4)) bands[i].res[ch] = get_bits(&gb, 4);

  244.             else bands[i].res[ch] = bands[i-1].res[ch] + t;

  245.         }

  246. 

  247.         if(bands[i].res[0] || bands[i].res[1]){

  248.             mb = i;

  249.             if(c->MSS) bands[i].msf = get_bits1(&gb);

  250.         }

  251.     }

  252.     /* get scale indexes coding method */

  253.     for(i = 0; i <= mb; i++)

  254.         for(ch = 0; ch < 2; ch++)

  255.             if(bands[i].res[ch]) bands[i].scfi[ch] = get_vlc2(&gb, scfi_vlc.table, MPC7_SCFI_BITS, 1);

  256.     /* get scale indexes */

  257.     for(i = 0; i <= mb; i++){

  258.         for(ch = 0; ch < 2; ch++){

  259.             if(bands[i].res[ch]){

  260.                 bands[i].scf_idx[ch][2] = c->oldDSCF[ch][i];

  261.                 t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7;

  262.                 bands[i].scf_idx[ch][0] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][2] + t);

  263.                 switch(bands[i].scfi[ch]){

  264.                 case 0:

  265.                     t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7;

  266.                     bands[i].scf_idx[ch][1] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][0] + t);

  267.                     t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7;

  268.                     bands[i].scf_idx[ch][2] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][1] + t);

  269.                     break;

  270.                 case 1:

  271.                     t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7;

  272.                     bands[i].scf_idx[ch][1] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][0] + t);

  273.                     bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1];

  274.                     break;

  275.                 case 2:

  276.                     bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];

  277.                     t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7;

  278.                     bands[i].scf_idx[ch][2] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][1] + t);

  279.                     break;

  280.                 case 3:

  281.                     bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];

  282.                     break;

  283.                 }

  284.                 c->oldDSCF[ch][i] = bands[i].scf_idx[ch][2];

  285.             }

  286.         }

  287.     }

  288.     /* get quantizers */

  289.     memset(Q, 0, sizeof(Q));

  290.     off = 0;

  291.     for(i = 0; i < BANDS; i++, off += SAMPLES_PER_BAND)

  292.         for(ch = 0; ch < 2; ch++)

  293.             idx_to_quant(c, &gb, bands[i].res[ch], Q[ch] + off);

  294.     /* dequantize */

  295.     memset(c->sb_samples, 0, sizeof(c->sb_samples));

  296.     off = 0;

  297.     for(i = 0; i <= mb; i++, off += SAMPLES_PER_BAND){

  298.         for(ch = 0; ch < 2; ch++){

  299.             if(bands[i].res[ch]){

  300.                 j = 0;

  301.                 mul = mpc_CC[bands[i].res[ch]] * mpc7_SCF[bands[i].scf_idx[ch][0]];

  302.                 for(; j < 12; j++)

  303.                     c->sb_samples[ch][j][i] = mul * Q[ch][j + off];

  304.                 mul = mpc_CC[bands[i].res[ch]] * mpc7_SCF[bands[i].scf_idx[ch][1]];

  305.                 for(; j < 24; j++)

  306.                     c->sb_samples[ch][j][i] = mul * Q[ch][j + off];

  307.                 mul = mpc_CC[bands[i].res[ch]] * mpc7_SCF[bands[i].scf_idx[ch][2]];

  308.                 for(; j < 36; j++)

  309.                     c->sb_samples[ch][j][i] = mul * Q[ch][j + off];

  310.             }

  311.         }

  312.         if(bands[i].msf){

  313.             int t1, t2;

  314.             for(j = 0; j < SAMPLES_PER_BAND; j++){

  315.                 t1 = c->sb_samples[0][j][i];

  316.                 t2 = c->sb_samples[1][j][i];

  317.                 c->sb_samples[0][j][i] = t1 + t2;

  318.                 c->sb_samples[1][j][i] = t1 - t2;

  319.             }

  320.         }

  321.     }

  322. 

  323.     mpc_synth(c, data);

  324. 

  325.     av_free(bits);

  326. 

  327.     bits_used = get_bits_count(&gb);

  328.     bits_avail = (buf_size - 4) * 8;

  329.     if(!buf[1] && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))){

  330.         av_log(NULL,0, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail);

  331.         return -1;

  332.     }

  333.     if(c->frames_to_skip){

  334.         c->frames_to_skip--;

  335.         *data_size = 0;

  336.         return buf_size;

  337.     }

  338.     *data_size = (buf[1] ? c->lastframelen : MPC_FRAME_SIZE) * 4;

  339. 

  340.     return buf_size;

  341. }

  342. 

  343. static void mpc7_decode_flush(AVCodecContext *avctx)

  344. {

  345.     MPCContext *c = avctx->priv_data;

  346. 

  347.     memset(c->oldDSCF, 0, sizeof(c->oldDSCF));

  348.     c->frames_to_skip = 32;

  349. }

  350. 

  351. AVCodec mpc7_decoder = {

  352.     "mpc sv7",

  353.     CODEC_TYPE_AUDIO,

  354.     CODEC_ID_MUSEPACK7,

  355.     sizeof(MPCContext),

  356.     mpc7_decode_init,

  357.     NULL,

  358.     NULL,

  359.     mpc7_decode_frame,

  360.     .flush = mpc7_decode_flush,

  361. };