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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. #include "random.h"

  33. 

  34. #ifdef CONFIG_MPEGAUDIO_HP

  35. #define USE_HIGHPRECISION

  36. #endif

  37. #include "mpegaudio.h"

  38. 

  39. #include "mpcdata.h"

  40. 

  41. #define BANDS            32

  42. #define SAMPLES_PER_BAND 36

  43. #define MPC_FRAME_SIZE   (BANDS * SAMPLES_PER_BAND)

  44. 

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

  46. 

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

  48. 

  49. typedef struct {

  50.     DSPContext dsp;

  51.     int IS, MSS, gapless;

  52.     int lastframelen, bands;

  53.     int oldDSCF[2][BANDS];

  54.     AVRandomState rnd;

  55.     int frames_to_skip;

  56.     /* for synthesis */

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

  58.     int synth_buf_offset[MPA_MAX_CHANNELS];

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

  60. } MPCContext;

  61. 

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

  63. typedef struct {

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

  65.     int res[2];

  66.     int scfi[2];

  67.     int scf_idx[2][3];

  68.     int Q[2];

  69. }Band;

  70. 

  71. static int mpc7_decode_init(AVCodecContext * avctx)

  72. {

  73.     int i, j;

  74.     MPCContext *c = avctx->priv_data;

  75.     GetBitContext gb;

  76.     uint8_t buf[16];

  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.     av_init_random(0xDEADBEEF, &c->rnd);

  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. /**

  139.  * Process decoded Musepack data and produce PCM

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

  141.  */

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

  143. {

  144.     int dither_state = 0;

  145.     int i, ch;

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

  147. 

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

  149.         samples_ptr = samples + ch;

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

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

  152.                                 mpa_window, &dither_state,

  153.                                 samples_ptr, 2,

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

  155.             samples_ptr += 64;

  156.         }

  157.     }

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

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

  160. }

  161. 

  162. /**

  163.  * Fill samples for given subband

  164.  */

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

  166. {

  167.     int i, i1, t;

  168.     switch(idx){

  169.     case -1:

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

  171.             *dst++ = (av_random(&c->rnd) & 0x3FC) - 510;

  172.         }

  173.         break;

  174.     case 1:

  175.         i1 = get_bits1(gb);

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

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

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

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

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

  181.         }

  182.         break;

  183.     case 2:

  184.         i1 = get_bits1(gb);

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

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

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

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

  189.         }

  190.         break;

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

  192.         i1 = get_bits1(gb);

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

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

  195.         break;

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

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

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

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

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

  201.         break;

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

  203.         return;

  204.     }

  205. }

  206. 

  207. static int mpc7_decode_frame(AVCodecContext * avctx,

  208.                             void *data, int *data_size,

  209.                             uint8_t * buf, int buf_size)

  210. {

  211.     MPCContext *c = avctx->priv_data;

  212.     GetBitContext gb;

  213.     uint8_t *bits;

  214.     int i, j, ch, t;

  215.     int mb = -1;

  216.     Band bands[BANDS];

  217.     int Q[2][MPC_FRAME_SIZE];

  218.     int off;

  219.     float mul;

  220.     int bits_used, bits_avail;

  221. 

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

  223.     if(buf_size <= 4){

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

  225.     }

  226. 

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

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

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

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

  231. 

  232.     /* read subband indexes */

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

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

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

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

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

  238.         }

  239. 

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

  241.             mb = i;

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

  243.         }

  244.     }

  245.     /* get scale indexes coding method */

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

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

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

  249.     /* get scale indexes */

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

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

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

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

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

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

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

  257.                 case 0:

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

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

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

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

  262.                     break;

  263.                 case 1:

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

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

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

  267.                     break;

  268.                 case 2:

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

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

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

  272.                     break;

  273.                 case 3:

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

  275.                     break;

  276.                 }

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

  278.             }

  279.         }

  280.     }

  281.     /* get quantizers */

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

  283.     off = 0;

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

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

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

  287.     /* dequantize */

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

  289.     off = 0;

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

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

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

  293.                 j = 0;

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

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

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

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

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

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

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

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

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

  303.             }

  304.         }

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

  306.             int t1, t2;

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

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

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

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

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

  312.             }

  313.         }

  314.     }

  315. 

  316.     mpc_synth(c, data);

  317. 

  318.     av_free(bits);

  319. 

  320.     bits_used = get_bits_count(&gb);

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

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

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

  324.         return -1;

  325.     }

  326.     if(c->frames_to_skip){

  327.         c->frames_to_skip--;

  328.         *data_size = 0;

  329.         return buf_size;

  330.     }

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

  332. 

  333.     return buf_size;

  334. }

  335. 

  336. static void mpc7_decode_flush(AVCodecContext *avctx)

  337. {

  338.     MPCContext *c = avctx->priv_data;

  339. 

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

  341.     c->frames_to_skip = 32;

  342. }

  343. 

  344. AVCodec mpc7_decoder = {

  345.     "mpc sv7",

  346.     CODEC_TYPE_AUDIO,

  347.     CODEC_ID_MUSEPACK7,

  348.     sizeof(MPCContext),

  349.     mpc7_decode_init,

  350.     NULL,

  351.     NULL,

  352.     mpc7_decode_frame,

  353.     .flush = mpc7_decode_flush,

  354. };