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FFmpeg/libavcodec/mpc.c

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  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.     /* for synthesis */

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

  56.     int synth_buf_offset[MPA_MAX_CHANNELS];

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

  58. } MPCContext;

  59. 

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

  61. typedef struct {

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

  63.     int res[2];

  64.     int scfi[2];

  65.     int scf_idx[2][3];

  66.     int Q[2];

  67. }Band;

  68. 

  69. static int mpc7_decode_init(AVCodecContext * avctx)

  70. {

  71.     int i, j;

  72.     MPCContext *c = avctx->priv_data;

  73.     GetBitContext gb;

  74.     uint8_t buf[16];

  75.     float f1=1.20050805774840750476 * 256;

  76.     static int vlc_inited = 0;

  77. 

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

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

  80.         return -1;

  81.     }

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

  83.     c->rnd = 0xDEADBEEF;

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

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

  86.     ff_mpa_synth_init(mpa_window);

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

  88. 

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

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

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

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

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

  94.         return -1;

  95.     }

  96.     skip_bits(&gb, 88);

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

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

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

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

  101. 

  102.     if(vlc_inited) return 0;

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

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

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

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

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

  108.         return -1;

  109.     }

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

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

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

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

  114.         return -1;

  115.     }

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

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

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

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

  120.         return -1;

  121.     }

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

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

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

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

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

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

  128.                 return -1;

  129.             }

  130.         }

  131.     }

  132.     vlc_inited = 1;

  133.     return 0;

  134. }

  135. 

  136. // XXX replace with something better

  137. static int av_always_inline mpc_rnd(MPCContext *c)

  138. {

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

  140.     return c->rnd;

  141. }

  142. 

  143. /**

  144.  * Process decoded Musepack data and produce PCM

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

  146.  */

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

  148. {

  149.     int dither_state = 0;

  150.     int i, ch;

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

  152. 

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

  154.         samples_ptr = samples + ch;

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

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

  157.                                 mpa_window, &dither_state,

  158.                                 samples_ptr, 2,

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

  160.             samples_ptr += 64;

  161.         }

  162.     }

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

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

  165. }

  166. 

  167. /**

  168.  * Fill samples for given subband

  169.  */

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

  171. {

  172.     int i, i1, t;

  173.     switch(idx){

  174.     case -1:

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

  176.             t = mpc_rnd(c);

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

  178.         }

  179.     case 1:

  180.         i1 = get_bits1(gb);

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

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

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

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

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

  186.         }

  187.         break;

  188.     case 2:

  189.         i1 = get_bits1(gb);

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

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

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

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

  194.         }

  195.         break;

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

  197.         i1 = get_bits1(gb);

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

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

  200.         break;

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

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

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

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

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

  206.         break;

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

  208.         return;

  209.     }

  210. }

  211. 

  212. static int mpc7_decode_frame(AVCodecContext * avctx,

  213.                             void *data, int *data_size,

  214.                             uint8_t * buf, int buf_size)

  215. {

  216.     MPCContext *c = avctx->priv_data;

  217.     GetBitContext gb;

  218.     uint8_t *bits;

  219.     int i, j, ch, t;

  220.     int mb = -1;

  221.     Band bands[BANDS];

  222.     int Q[2][MPC_FRAME_SIZE];

  223.     int off;

  224.     float mul;

  225.     int bits_used, bits_avail;

  226. 

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

  228.     if(buf_size <= 4){

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

  230.     }

  231. 

  232.     bits = av_malloc((buf_size - 1) & ~3);

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

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

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

  236. 

  237.     /* read subband indexes */

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

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

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

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

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

  243.         }

  244. 

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

  246.             mb = i;

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

  248.         }

  249.     }

  250.     /* get scale indexes coding method */

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

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

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

  254.     /* get scale indexes */

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

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

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

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

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

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

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

  262.                 case 0:

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

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

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

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

  267.                     break;

  268.                 case 1:

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

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

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

  272.                     break;

  273.                 case 2:

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

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

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

  277.                     break;

  278.                 case 3:

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

  280.                     break;

  281.                 }

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

  283.             }

  284.         }

  285.     }

  286.     /* get quantizers */

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

  288.     off = 0;

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

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

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

  292.     /* dequantize */

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

  294.     off = 0;

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

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

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

  298.                 j = 0;

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

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

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

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

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

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

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

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

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

  308.             }

  309.         }

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

  311.             int t1, t2;

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

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

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

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

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

  317.             }

  318.         }

  319.     }

  320. 

  321.     mpc_synth(c, data);

  322. 

  323.     av_free(bits);

  324. 

  325.     bits_used = get_bits_count(&gb);

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

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

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

  329.         return -1;

  330.     }

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

  332. 

  333.     return buf_size;

  334. }

  335. 

  336. 

  337. AVCodec mpc7_decoder = {

  338.     "mpc sv7",

  339.     CODEC_TYPE_AUDIO,

  340.     CODEC_ID_MUSEPACK7,

  341.     sizeof(MPCContext),

  342.     mpc7_decode_init,

  343.     NULL,

  344.     NULL,

  345.     mpc7_decode_frame,

  346. };