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FFmpeg/libavcodec/mpc8.c

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  1. /*

  2.  * Musepack SV8 decoder

  3.  * Copyright (c) 2007 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.  * @file libavcodec/mpc8.c Musepack SV8 decoder

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

  25.  * divided into 32 subbands.

  26.  */

  27. 

  28. #include "libavutil/lfg.h"

  29. #include "avcodec.h"

  30. #include "get_bits.h"

  31. #include "dsputil.h"

  32. #include "mpegaudio.h"

  33. 

  34. #include "mpc.h"

  35. #include "mpcdata.h"

  36. #include "mpc8data.h"

  37. #include "mpc8huff.h"

  38. 

  39. static VLC band_vlc, scfi_vlc[2], dscf_vlc[2], res_vlc[2];

  40. static VLC q1_vlc, q2_vlc[2], q3_vlc[2], quant_vlc[4][2], q9up_vlc;

  41. 

  42. static const int q3_offsets[2] = { MPC8_Q3_OFFSET, MPC8_Q4_OFFSET };

  43. static const int quant_offsets[6] = { MPC8_Q5_OFFSET, MPC8_Q6_OFFSET, MPC8_Q7_OFFSET, MPC8_Q8_OFFSET };

  44. 

  45. static inline int mpc8_dec_base(GetBitContext *gb, int k, int n)

  46. {

  47.     int len = mpc8_cnk_len[k-1][n-1] - 1;

  48.     int code = len ? get_bits_long(gb, len) : 0;

  49. 

  50.     if (code >= mpc8_cnk_lost[k-1][n-1])

  51.         code = ((code << 1) | get_bits1(gb)) - mpc8_cnk_lost[k-1][n-1];

  52. 

  53.     return code;

  54. }

  55. 

  56. static inline int mpc8_dec_enum(GetBitContext *gb, int k, int n)

  57. {

  58.     int bits = 0;

  59.     const uint32_t * C = mpc8_cnk[k-1];

  60.     int code = mpc8_dec_base(gb, k, n);

  61. 

  62.     do {

  63.         n--;

  64.         if (code >= C[n]) {

  65.             bits |= 1 << n;

  66.             code -= C[n];

  67.             C -= 32;

  68.             k--;

  69.         }

  70.     } while(k > 0);

  71. 

  72.     return bits;

  73. }

  74. 

  75. static inline int mpc8_get_mod_golomb(GetBitContext *gb, int m)

  76. {

  77.     if(mpc8_cnk_len[0][m] < 1) return 0;

  78.     return mpc8_dec_base(gb, 1, m+1);

  79. }

  80. 

  81. static int mpc8_get_mask(GetBitContext *gb, int size, int t)

  82. {

  83.     int mask = 0;

  84. 

  85.     if(t && t != size)

  86.          mask = mpc8_dec_enum(gb, FFMIN(t, size - t), size);

  87.     if((t << 1) > size) mask = ~mask;

  88. 

  89.     return mask;

  90. }

  91. 

  92. static const uint16_t vlc_offsets[13] = {

  93.     0, 640, 1184, 1748, 2298, 2426, 2554, 3066, 3578, 4106, 4618, 5196, 5708

  94. };

  95. 

  96. static av_cold int mpc8_decode_init(AVCodecContext * avctx)

  97. {

  98.     int i;

  99.     MPCContext *c = avctx->priv_data;

  100.     GetBitContext gb;

  101.     static int vlc_initialized = 0;

  102. 

  103.     static VLC_TYPE band_table[542][2];

  104.     static VLC_TYPE q1_table[520][2];

  105.     static VLC_TYPE q9up_table[524][2];

  106.     static VLC_TYPE scfi0_table[1 << MPC8_SCFI0_BITS][2];

  107.     static VLC_TYPE scfi1_table[1 << MPC8_SCFI1_BITS][2];

  108.     static VLC_TYPE dscf0_table[560][2];

  109.     static VLC_TYPE dscf1_table[598][2];

  110.     static VLC_TYPE q3_0_table[512][2];

  111.     static VLC_TYPE q3_1_table[516][2];

  112.     static VLC_TYPE codes_table[5708][2];

  113. 

  114.     if(avctx->extradata_size < 2){

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

  116.         return -1;

  117.     }

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

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

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

  121. 

  122.     ff_mpc_init();

  123. 

  124.     init_get_bits(&gb, avctx->extradata, 16);

  125. 

  126.     skip_bits(&gb, 3);//sample rate

  127.     c->maxbands = get_bits(&gb, 5) + 1;

  128.     skip_bits(&gb, 4);//channels

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

  130.     c->frames = 1 << (get_bits(&gb, 3) * 2);

  131. 

  132.     if(vlc_initialized) return 0;

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

  134. 

  135.     band_vlc.table = band_table;

  136.     band_vlc.table_allocated = 542;

  137.     init_vlc(&band_vlc, MPC8_BANDS_BITS, MPC8_BANDS_SIZE,

  138.              mpc8_bands_bits,  1, 1,

  139.              mpc8_bands_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);

  140. 

  141.     q1_vlc.table = q1_table;

  142.     q1_vlc.table_allocated = 520;

  143.     init_vlc(&q1_vlc, MPC8_Q1_BITS, MPC8_Q1_SIZE,

  144.              mpc8_q1_bits,  1, 1,

  145.              mpc8_q1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);

  146.     q9up_vlc.table = q9up_table;

  147.     q9up_vlc.table_allocated = 524;

  148.     init_vlc(&q9up_vlc, MPC8_Q9UP_BITS, MPC8_Q9UP_SIZE,

  149.              mpc8_q9up_bits,  1, 1,

  150.              mpc8_q9up_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);

  151. 

  152.     scfi_vlc[0].table = scfi0_table;

  153.     scfi_vlc[0].table_allocated = 1 << MPC8_SCFI0_BITS;

  154.     init_vlc(&scfi_vlc[0], MPC8_SCFI0_BITS, MPC8_SCFI0_SIZE,

  155.              mpc8_scfi0_bits,  1, 1,

  156.              mpc8_scfi0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);

  157.     scfi_vlc[1].table = scfi1_table;

  158.     scfi_vlc[1].table_allocated = 1 << MPC8_SCFI1_BITS;

  159.     init_vlc(&scfi_vlc[1], MPC8_SCFI1_BITS, MPC8_SCFI1_SIZE,

  160.              mpc8_scfi1_bits,  1, 1,

  161.              mpc8_scfi1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);

  162. 

  163.     dscf_vlc[0].table = dscf0_table;

  164.     dscf_vlc[0].table_allocated = 560;

  165.     init_vlc(&dscf_vlc[0], MPC8_DSCF0_BITS, MPC8_DSCF0_SIZE,

  166.              mpc8_dscf0_bits,  1, 1,

  167.              mpc8_dscf0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);

  168.     dscf_vlc[1].table = dscf1_table;

  169.     dscf_vlc[1].table_allocated = 598;

  170.     init_vlc(&dscf_vlc[1], MPC8_DSCF1_BITS, MPC8_DSCF1_SIZE,

  171.              mpc8_dscf1_bits,  1, 1,

  172.              mpc8_dscf1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);

  173. 

  174.     q3_vlc[0].table = q3_0_table;

  175.     q3_vlc[0].table_allocated = 512;

  176.     init_vlc_sparse(&q3_vlc[0], MPC8_Q3_BITS, MPC8_Q3_SIZE,

  177.              mpc8_q3_bits,  1, 1,

  178.              mpc8_q3_codes, 1, 1,

  179.              mpc8_q3_syms,  1, 1, INIT_VLC_USE_NEW_STATIC);

  180.     q3_vlc[1].table = q3_1_table;

  181.     q3_vlc[1].table_allocated = 516;

  182.     init_vlc_sparse(&q3_vlc[1], MPC8_Q4_BITS, MPC8_Q4_SIZE,

  183.              mpc8_q4_bits,  1, 1,

  184.              mpc8_q4_codes, 1, 1,

  185.              mpc8_q4_syms,  1, 1, INIT_VLC_USE_NEW_STATIC);

  186. 

  187.     for(i = 0; i < 2; i++){

  188.         res_vlc[i].table = &codes_table[vlc_offsets[0+i]];

  189.         res_vlc[i].table_allocated = vlc_offsets[1+i] - vlc_offsets[0+i];

  190.         init_vlc(&res_vlc[i], MPC8_RES_BITS, MPC8_RES_SIZE,

  191.                  &mpc8_res_bits[i],  1, 1,

  192.                  &mpc8_res_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);

  193. 

  194.         q2_vlc[i].table = &codes_table[vlc_offsets[2+i]];

  195.         q2_vlc[i].table_allocated = vlc_offsets[3+i] - vlc_offsets[2+i];

  196.         init_vlc(&q2_vlc[i], MPC8_Q2_BITS, MPC8_Q2_SIZE,

  197.                  &mpc8_q2_bits[i],  1, 1,

  198.                  &mpc8_q2_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);

  199. 

  200.         quant_vlc[0][i].table = &codes_table[vlc_offsets[4+i]];

  201.         quant_vlc[0][i].table_allocated = vlc_offsets[5+i] - vlc_offsets[4+i];

  202.         init_vlc(&quant_vlc[0][i], MPC8_Q5_BITS, MPC8_Q5_SIZE,

  203.                  &mpc8_q5_bits[i],  1, 1,

  204.                  &mpc8_q5_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);

  205.         quant_vlc[1][i].table = &codes_table[vlc_offsets[6+i]];

  206.         quant_vlc[1][i].table_allocated = vlc_offsets[7+i] - vlc_offsets[6+i];

  207.         init_vlc(&quant_vlc[1][i], MPC8_Q6_BITS, MPC8_Q6_SIZE,

  208.                  &mpc8_q6_bits[i],  1, 1,

  209.                  &mpc8_q6_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);

  210.         quant_vlc[2][i].table = &codes_table[vlc_offsets[8+i]];

  211.         quant_vlc[2][i].table_allocated = vlc_offsets[9+i] - vlc_offsets[8+i];

  212.         init_vlc(&quant_vlc[2][i], MPC8_Q7_BITS, MPC8_Q7_SIZE,

  213.                  &mpc8_q7_bits[i],  1, 1,

  214.                  &mpc8_q7_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);

  215.         quant_vlc[3][i].table = &codes_table[vlc_offsets[10+i]];

  216.         quant_vlc[3][i].table_allocated = vlc_offsets[11+i] - vlc_offsets[10+i];

  217.         init_vlc(&quant_vlc[3][i], MPC8_Q8_BITS, MPC8_Q8_SIZE,

  218.                  &mpc8_q8_bits[i],  1, 1,

  219.                  &mpc8_q8_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);

  220.     }

  221.     vlc_initialized = 1;

  222.     avctx->sample_fmt = SAMPLE_FMT_S16;

  223.     avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO;

  224.     return 0;

  225. }

  226. 

  227. static int mpc8_decode_frame(AVCodecContext * avctx,

  228.                             void *data, int *data_size,

  229.                             AVPacket *avpkt)

  230. {

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

  232.     int buf_size = avpkt->size;

  233.     MPCContext *c = avctx->priv_data;

  234.     GetBitContext gb2, *gb = &gb2;

  235.     int i, j, k, ch, cnt, res, t;

  236.     Band *bands = c->bands;

  237.     int off;

  238.     int maxband, keyframe;

  239.     int last[2];

  240. 

  241.     keyframe = c->cur_frame == 0;

  242. 

  243.     if(keyframe){

  244.         memset(c->Q, 0, sizeof(c->Q));

  245.         c->last_bits_used = 0;

  246.     }

  247.     init_get_bits(gb, buf, buf_size * 8);

  248.     skip_bits(gb, c->last_bits_used & 7);

  249. 

  250.     if(keyframe)

  251.         maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1);

  252.     else{

  253.         maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2);

  254.         if(maxband > 32) maxband -= 33;

  255.     }

  256.     c->last_max_band = maxband;

  257. 

  258.     /* read subband indexes */

  259.     if(maxband){

  260.         last[0] = last[1] = 0;

  261.         for(i = maxband - 1; i >= 0; i--){

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

  263.                 last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch];

  264.                 if(last[ch] > 15) last[ch] -= 17;

  265.                 bands[i].res[ch] = last[ch];

  266.             }

  267.         }

  268.         if(c->MSS){

  269.             int mask;

  270. 

  271.             cnt = 0;

  272.             for(i = 0; i < maxband; i++)

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

  274.                     cnt++;

  275.             t = mpc8_get_mod_golomb(gb, cnt);

  276.             mask = mpc8_get_mask(gb, cnt, t);

  277.             for(i = maxband - 1; i >= 0; i--)

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

  279.                     bands[i].msf = mask & 1;

  280.                     mask >>= 1;

  281.                 }

  282.         }

  283.     }

  284.     for(i = maxband; i < c->maxbands; i++)

  285.         bands[i].res[0] = bands[i].res[1] = 0;

  286. 

  287.     if(keyframe){

  288.         for(i = 0; i < 32; i++)

  289.             c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1;

  290.     }

  291. 

  292.     for(i = 0; i < maxband; i++){

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

  294.             cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1;

  295.             if(cnt >= 0){

  296.                 t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1);

  297.                 if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt);

  298.                 if(bands[i].res[1]) bands[i].scfi[1] = t & 3;

  299.             }

  300.         }

  301.     }

  302. 

  303.     for(i = 0; i < maxband; i++){

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

  305.             if(!bands[i].res[ch]) continue;

  306. 

  307.             if(c->oldDSCF[ch][i]){

  308.                 bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6;

  309.                 c->oldDSCF[ch][i] = 0;

  310.             }else{

  311.                 t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2);

  312.                 if(t == 64)

  313.                     t += get_bits(gb, 6);

  314.                 bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6;

  315.             }

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

  317.                 if((bands[i].scfi[ch] << j) & 2)

  318.                     bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j];

  319.                 else{

  320.                     t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2);

  321.                     if(t == 31)

  322.                         t = 64 + get_bits(gb, 6);

  323.                     bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6;

  324.                 }

  325.             }

  326.         }

  327.     }

  328. 

  329.     for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){

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

  331.             res = bands[i].res[ch];

  332.             switch(res){

  333.             case -1:

  334.                 for(j = 0; j < SAMPLES_PER_BAND; j++)

  335.                     c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510;

  336.                 break;

  337.             case 0:

  338.                 break;

  339.             case 1:

  340.                 for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){

  341.                     cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2);

  342.                     t = mpc8_get_mask(gb, 18, cnt);

  343.                     for(k = 0; k < SAMPLES_PER_BAND / 2; k++, t <<= 1)

  344.                         c->Q[ch][off + j + k] = (t & 0x20000) ? (get_bits1(gb) << 1) - 1 : 0;

  345.                 }

  346.                 break;

  347.             case 2:

  348.                 cnt = 6;//2*mpc8_thres[res]

  349.                 for(j = 0; j < SAMPLES_PER_BAND; j += 3){

  350.                     t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2);

  351.                     c->Q[ch][off + j + 0] = mpc8_idx50[t];

  352.                     c->Q[ch][off + j + 1] = mpc8_idx51[t];

  353.                     c->Q[ch][off + j + 2] = mpc8_idx52[t];

  354.                     cnt = (cnt >> 1) + mpc8_huffq2[t];

  355.                 }

  356.                 break;

  357.             case 3:

  358.             case 4:

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

  360.                     t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2) + q3_offsets[res - 3];

  361.                     c->Q[ch][off + j + 1] = t >> 4;

  362.                     c->Q[ch][off + j + 0] = (t & 8) ? (t & 0xF) - 16 : (t & 0xF);

  363.                 }

  364.                 break;

  365.             case 5:

  366.             case 6:

  367.             case 7:

  368.             case 8:

  369.                 cnt = 2 * mpc8_thres[res];

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

  371.                     t = get_vlc2(gb, quant_vlc[res - 5][cnt > mpc8_thres[res]].table, quant_vlc[res - 5][cnt > mpc8_thres[res]].bits, 2) + quant_offsets[res - 5];

  372.                     c->Q[ch][off + j] = t;

  373.                     cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]);

  374.                 }

  375.                 break;

  376.             default:

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

  378.                     c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2);

  379.                     if(res != 9){

  380.                         c->Q[ch][off + j] <<= res - 9;

  381.                         c->Q[ch][off + j] |= get_bits(gb, res - 9);

  382.                     }

  383.                     c->Q[ch][off + j] -= (1 << (res - 2)) - 1;

  384.                 }

  385.             }

  386.         }

  387.     }

  388. 

  389.     ff_mpc_dequantize_and_synth(c, maxband, data);

  390. 

  391.     c->cur_frame++;

  392. 

  393.     c->last_bits_used = get_bits_count(gb);

  394.     if(c->cur_frame >= c->frames)

  395.         c->cur_frame = 0;

  396.     *data_size =  MPC_FRAME_SIZE * 4;

  397. 

  398.     return c->cur_frame ? c->last_bits_used >> 3 : buf_size;

  399. }

  400. 

  401. AVCodec mpc8_decoder = {

  402.     "mpc8",

  403.     CODEC_TYPE_AUDIO,

  404.     CODEC_ID_MUSEPACK8,

  405.     sizeof(MPCContext),

  406.     mpc8_decode_init,

  407.     NULL,

  408.     NULL,

  409.     mpc8_decode_frame,

  410.     .long_name = NULL_IF_CONFIG_SMALL("Musepack SV8"),

  411. };