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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
  24.  * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples
  25.  * divided into 32 subbands.
  26.  */
  27.  
  28. #include "libavutil/channel_layout.h"
  29. #include "libavutil/lfg.h"
  30. #include "avcodec.h"
  31. #include "get_bits.h"
  32. #include "internal.h"
  33. #include "mpegaudiodsp.h"
  34.  
  35. #include "mpc.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.     int channels;
  103.  
  104.     static VLC_TYPE band_table[542][2];
  105.     static VLC_TYPE q1_table[520][2];
  106.     static VLC_TYPE q9up_table[524][2];
  107.     static VLC_TYPE scfi0_table[1 << MPC8_SCFI0_BITS][2];
  108.     static VLC_TYPE scfi1_table[1 << MPC8_SCFI1_BITS][2];
  109.     static VLC_TYPE dscf0_table[560][2];
  110.     static VLC_TYPE dscf1_table[598][2];
  111.     static VLC_TYPE q3_0_table[512][2];
  112.     static VLC_TYPE q3_1_table[516][2];
  113.     static VLC_TYPE codes_table[5708][2];
  114.  
  115.     if(avctx->extradata_size < 2){
  116.         av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
  117.         return -1;
  118.     }
  119.     memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
  120.     av_lfg_init(&c->rnd, 0xDEADBEEF);
  121.     ff_mpadsp_init(&c->mpadsp);
  122.  
  123.     ff_mpc_init();
  124.  
  125.     init_get_bits(&gb, avctx->extradata, 16);
  126.  
  127.     skip_bits(&gb, 3);//sample rate
  128.     c->maxbands = get_bits(&gb, 5) + 1;
  129.     if (c->maxbands >= BANDS) {
  130.         av_log(avctx,AV_LOG_ERROR, "maxbands %d too high\n", c->maxbands);
  131.         return AVERROR_INVALIDDATA;
  132.     }
  133.     channels = get_bits(&gb, 4) + 1;
  134.     if (channels > 2) {
  135.         avpriv_request_sample(avctx, "Multichannel MPC SV8");
  136.         return AVERROR_PATCHWELCOME;
  137.     }
  138.     c->MSS = get_bits1(&gb);
  139.     c->frames = 1 << (get_bits(&gb, 3) * 2);
  140.  
  141.     avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
  142.     avctx->channel_layout = (channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
  143.     avctx->channels = channels;
  144.  
  145.     if(vlc_initialized) return 0;
  146.     av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
  147.  
  148.     band_vlc.table = band_table;
  149.     band_vlc.table_allocated = 542;
  150.     init_vlc(&band_vlc, MPC8_BANDS_BITS, MPC8_BANDS_SIZE,
  151.              mpc8_bands_bits,  1, 1,
  152.              mpc8_bands_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
  153.  
  154.     q1_vlc.table = q1_table;
  155.     q1_vlc.table_allocated = 520;
  156.     init_vlc(&q1_vlc, MPC8_Q1_BITS, MPC8_Q1_SIZE,
  157.              mpc8_q1_bits,  1, 1,
  158.              mpc8_q1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
  159.     q9up_vlc.table = q9up_table;
  160.     q9up_vlc.table_allocated = 524;
  161.     init_vlc(&q9up_vlc, MPC8_Q9UP_BITS, MPC8_Q9UP_SIZE,
  162.              mpc8_q9up_bits,  1, 1,
  163.              mpc8_q9up_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
  164.  
  165.     scfi_vlc[0].table = scfi0_table;
  166.     scfi_vlc[0].table_allocated = 1 << MPC8_SCFI0_BITS;
  167.     init_vlc(&scfi_vlc[0], MPC8_SCFI0_BITS, MPC8_SCFI0_SIZE,
  168.              mpc8_scfi0_bits,  1, 1,
  169.              mpc8_scfi0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
  170.     scfi_vlc[1].table = scfi1_table;
  171.     scfi_vlc[1].table_allocated = 1 << MPC8_SCFI1_BITS;
  172.     init_vlc(&scfi_vlc[1], MPC8_SCFI1_BITS, MPC8_SCFI1_SIZE,
  173.              mpc8_scfi1_bits,  1, 1,
  174.              mpc8_scfi1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
  175.  
  176.     dscf_vlc[0].table = dscf0_table;
  177.     dscf_vlc[0].table_allocated = 560;
  178.     init_vlc(&dscf_vlc[0], MPC8_DSCF0_BITS, MPC8_DSCF0_SIZE,
  179.              mpc8_dscf0_bits,  1, 1,
  180.              mpc8_dscf0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
  181.     dscf_vlc[1].table = dscf1_table;
  182.     dscf_vlc[1].table_allocated = 598;
  183.     init_vlc(&dscf_vlc[1], MPC8_DSCF1_BITS, MPC8_DSCF1_SIZE,
  184.              mpc8_dscf1_bits,  1, 1,
  185.              mpc8_dscf1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
  186.  
  187.     q3_vlc[0].table = q3_0_table;
  188.     q3_vlc[0].table_allocated = 512;
  189.     ff_init_vlc_sparse(&q3_vlc[0], MPC8_Q3_BITS, MPC8_Q3_SIZE,
  190.              mpc8_q3_bits,  1, 1,
  191.              mpc8_q3_codes, 1, 1,
  192.              mpc8_q3_syms,  1, 1, INIT_VLC_USE_NEW_STATIC);
  193.     q3_vlc[1].table = q3_1_table;
  194.     q3_vlc[1].table_allocated = 516;
  195.     ff_init_vlc_sparse(&q3_vlc[1], MPC8_Q4_BITS, MPC8_Q4_SIZE,
  196.              mpc8_q4_bits,  1, 1,
  197.              mpc8_q4_codes, 1, 1,
  198.              mpc8_q4_syms,  1, 1, INIT_VLC_USE_NEW_STATIC);
  199.  
  200.     for(i = 0; i < 2; i++){
  201.         res_vlc[i].table = &codes_table[vlc_offsets[0+i]];
  202.         res_vlc[i].table_allocated = vlc_offsets[1+i] - vlc_offsets[0+i];
  203.         init_vlc(&res_vlc[i], MPC8_RES_BITS, MPC8_RES_SIZE,
  204.                  &mpc8_res_bits[i],  1, 1,
  205.                  &mpc8_res_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
  206.  
  207.         q2_vlc[i].table = &codes_table[vlc_offsets[2+i]];
  208.         q2_vlc[i].table_allocated = vlc_offsets[3+i] - vlc_offsets[2+i];
  209.         init_vlc(&q2_vlc[i], MPC8_Q2_BITS, MPC8_Q2_SIZE,
  210.                  &mpc8_q2_bits[i],  1, 1,
  211.                  &mpc8_q2_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
  212.  
  213.         quant_vlc[0][i].table = &codes_table[vlc_offsets[4+i]];
  214.         quant_vlc[0][i].table_allocated = vlc_offsets[5+i] - vlc_offsets[4+i];
  215.         init_vlc(&quant_vlc[0][i], MPC8_Q5_BITS, MPC8_Q5_SIZE,
  216.                  &mpc8_q5_bits[i],  1, 1,
  217.                  &mpc8_q5_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
  218.         quant_vlc[1][i].table = &codes_table[vlc_offsets[6+i]];
  219.         quant_vlc[1][i].table_allocated = vlc_offsets[7+i] - vlc_offsets[6+i];
  220.         init_vlc(&quant_vlc[1][i], MPC8_Q6_BITS, MPC8_Q6_SIZE,
  221.                  &mpc8_q6_bits[i],  1, 1,
  222.                  &mpc8_q6_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
  223.         quant_vlc[2][i].table = &codes_table[vlc_offsets[8+i]];
  224.         quant_vlc[2][i].table_allocated = vlc_offsets[9+i] - vlc_offsets[8+i];
  225.         init_vlc(&quant_vlc[2][i], MPC8_Q7_BITS, MPC8_Q7_SIZE,
  226.                  &mpc8_q7_bits[i],  1, 1,
  227.                  &mpc8_q7_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
  228.         quant_vlc[3][i].table = &codes_table[vlc_offsets[10+i]];
  229.         quant_vlc[3][i].table_allocated = vlc_offsets[11+i] - vlc_offsets[10+i];
  230.         init_vlc(&quant_vlc[3][i], MPC8_Q8_BITS, MPC8_Q8_SIZE,
  231.                  &mpc8_q8_bits[i],  1, 1,
  232.                  &mpc8_q8_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
  233.     }
  234.     vlc_initialized = 1;
  235.  
  236.     return 0;
  237. }
  238.  
  239. static int mpc8_decode_frame(AVCodecContext * avctx, void *data,
  240.                              int *got_frame_ptr, AVPacket *avpkt)
  241. {
  242.     AVFrame *frame     = data;
  243.     const uint8_t *buf = avpkt->data;
  244.     int buf_size = avpkt->size;
  245.     MPCContext *c = avctx->priv_data;
  246.     GetBitContext gb2, *gb = &gb2;
  247.     int i, j, k, ch, cnt, res, t;
  248.     Band *bands = c->bands;
  249.     int off;
  250.     int maxband, keyframe;
  251.     int last[2];
  252.  
  253.     /* get output buffer */
  254.     frame->nb_samples = MPC_FRAME_SIZE;
  255.     if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
  256.         return res;
  257.  
  258.     keyframe = c->cur_frame == 0;
  259.  
  260.     if(keyframe){
  261.         memset(c->Q, 0, sizeof(c->Q));
  262.         c->last_bits_used = 0;
  263.     }
  264.     init_get_bits(gb, buf, buf_size * 8);
  265.     skip_bits(gb, c->last_bits_used & 7);
  266.  
  267.     if(keyframe)
  268.         maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1);
  269.     else{
  270.         maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2);
  271.         if(maxband > 32) maxband -= 33;
  272.     }
  273.  
  274.     if(maxband > c->maxbands + 1) {
  275.         av_log(avctx, AV_LOG_ERROR, "maxband %d too large\n",maxband);
  276.         return AVERROR_INVALIDDATA;
  277.     }
  278.     c->last_max_band = maxband;
  279.  
  280.     /* read subband indexes */
  281.     if(maxband){
  282.         last[0] = last[1] = 0;
  283.         for(i = maxband - 1; i >= 0; i--){
  284.             for(ch = 0; ch < 2; ch++){
  285.                 last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch];
  286.                 if(last[ch] > 15) last[ch] -= 17;
  287.                 bands[i].res[ch] = last[ch];
  288.             }
  289.         }
  290.         if(c->MSS){
  291.             int mask;
  292.  
  293.             cnt = 0;
  294.             for(i = 0; i < maxband; i++)
  295.                 if(bands[i].res[0] || bands[i].res[1])
  296.                     cnt++;
  297.             t = mpc8_get_mod_golomb(gb, cnt);
  298.             mask = mpc8_get_mask(gb, cnt, t);
  299.             for(i = maxband - 1; i >= 0; i--)
  300.                 if(bands[i].res[0] || bands[i].res[1]){
  301.                     bands[i].msf = mask & 1;
  302.                     mask >>= 1;
  303.                 }
  304.         }
  305.     }
  306.     for(i = maxband; i < c->maxbands; i++)
  307.         bands[i].res[0] = bands[i].res[1] = 0;
  308.  
  309.     if(keyframe){
  310.         for(i = 0; i < 32; i++)
  311.             c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1;
  312.     }
  313.  
  314.     for(i = 0; i < maxband; i++){
  315.         if(bands[i].res[0] || bands[i].res[1]){
  316.             cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1;
  317.             if(cnt >= 0){
  318.                 t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1);
  319.                 if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt);
  320.                 if(bands[i].res[1]) bands[i].scfi[1] = t & 3;
  321.             }
  322.         }
  323.     }
  324.  
  325.     for(i = 0; i < maxband; i++){
  326.         for(ch = 0; ch < 2; ch++){
  327.             if(!bands[i].res[ch]) continue;
  328.  
  329.             if(c->oldDSCF[ch][i]){
  330.                 bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6;
  331.                 c->oldDSCF[ch][i] = 0;
  332.             }else{
  333.                 t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2);
  334.                 if(t == 64)
  335.                     t += get_bits(gb, 6);
  336.                 bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6;
  337.             }
  338.             for(j = 0; j < 2; j++){
  339.                 if((bands[i].scfi[ch] << j) & 2)
  340.                     bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j];
  341.                 else{
  342.                     t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2);
  343.                     if(t == 31)
  344.                         t = 64 + get_bits(gb, 6);
  345.                     bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6;
  346.                 }
  347.             }
  348.         }
  349.     }
  350.  
  351.     for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){
  352.         for(ch = 0; ch < 2; ch++){
  353.             res = bands[i].res[ch];
  354.             switch(res){
  355.             case -1:
  356.                 for(j = 0; j < SAMPLES_PER_BAND; j++)
  357.                     c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
  358.                 break;
  359.             case 0:
  360.                 break;
  361.             case 1:
  362.                 for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){
  363.                     cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2);
  364.                     t = mpc8_get_mask(gb, 18, cnt);
  365.                     for(k = 0; k < SAMPLES_PER_BAND / 2; k++, t <<= 1)
  366.                         c->Q[ch][off + j + k] = (t & 0x20000) ? (get_bits1(gb) << 1) - 1 : 0;
  367.                 }
  368.                 break;
  369.             case 2:
  370.                 cnt = 6;//2*mpc8_thres[res]
  371.                 for(j = 0; j < SAMPLES_PER_BAND; j += 3){
  372.                     t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2);
  373.                     c->Q[ch][off + j + 0] = mpc8_idx50[t];
  374.                     c->Q[ch][off + j + 1] = mpc8_idx51[t];
  375.                     c->Q[ch][off + j + 2] = mpc8_idx52[t];
  376.                     cnt = (cnt >> 1) + mpc8_huffq2[t];
  377.                 }
  378.                 break;
  379.             case 3:
  380.             case 4:
  381.                 for(j = 0; j < SAMPLES_PER_BAND; j += 2){
  382.                     t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2) + q3_offsets[res - 3];
  383.                     c->Q[ch][off + j + 1] = t >> 4;
  384.                     c->Q[ch][off + j + 0] = (t & 8) ? (t & 0xF) - 16 : (t & 0xF);
  385.                 }
  386.                 break;
  387.             case 5:
  388.             case 6:
  389.             case 7:
  390.             case 8:
  391.                 cnt = 2 * mpc8_thres[res];
  392.                 for(j = 0; j < SAMPLES_PER_BAND; j++){
  393.                     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];
  394.                     c->Q[ch][off + j] = t;
  395.                     cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]);
  396.                 }
  397.                 break;
  398.             default:
  399.                 for(j = 0; j < SAMPLES_PER_BAND; j++){
  400.                     c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2);
  401.                     if(res != 9){
  402.                         c->Q[ch][off + j] <<= res - 9;
  403.                         c->Q[ch][off + j] |= get_bits(gb, res - 9);
  404.                     }
  405.                     c->Q[ch][off + j] -= (1 << (res - 2)) - 1;
  406.                 }
  407.             }
  408.         }
  409.     }
  410.  
  411.     ff_mpc_dequantize_and_synth(c, maxband - 1,
  412.                                 (int16_t **)frame->extended_data,
  413.                                 avctx->channels);
  414.  
  415.     c->cur_frame++;
  416.  
  417.     c->last_bits_used = get_bits_count(gb);
  418.     if(get_bits_left(gb) < 8) // we have only padding left
  419.         c->last_bits_used = buf_size << 3;
  420.     if(c->cur_frame >= c->frames)
  421.         c->cur_frame = 0;
  422.  
  423.     *got_frame_ptr = 1;
  424.  
  425.     return c->cur_frame ? c->last_bits_used >> 3 : buf_size;
  426. }
  427.  
  428. static av_cold void mpc8_decode_flush(AVCodecContext *avctx)
  429. {
  430.     MPCContext *c = avctx->priv_data;
  431.     c->cur_frame = 0;
  432. }
  433.  
  434. AVCodec ff_mpc8_decoder = {
  435.     .name           = "mpc8",
  436.     .long_name      = NULL_IF_CONFIG_SMALL("Musepack SV8"),
  437.     .type           = AVMEDIA_TYPE_AUDIO,
  438.     .id             = AV_CODEC_ID_MUSEPACK8,
  439.     .priv_data_size = sizeof(MPCContext),
  440.     .init           = mpc8_decode_init,
  441.     .decode         = mpc8_decode_frame,
  442.     .flush          = mpc8_decode_flush,
  443.     .capabilities   = AV_CODEC_CAP_DR1,
  444.     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
  445.                                                       AV_SAMPLE_FMT_NONE },
  446. };
  447.