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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

  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 |= 1U << 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.     keyframe = c->cur_frame == 0;

  254. 

  255.     if(keyframe){

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

  257.         c->last_bits_used = 0;

  258.     }

  259.     if ((res = init_get_bits8(gb, buf, buf_size)) < 0)

  260.         return res;

  261. 

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

  263. 

  264.     if(keyframe)

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

  266.     else{

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

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

  269.     }

  270. 

  271.     if (get_bits_left(gb) < 0) {

  272.         *got_frame_ptr = 0;

  273.         return buf_size;

  274.     }

  275. 

  276.     if(maxband > c->maxbands + 1) {

  277.         av_log(avctx, AV_LOG_ERROR, "maxband %d too large\n",maxband);

  278.         return AVERROR_INVALIDDATA;

  279.     }

  280.     c->last_max_band = maxband;

  281. 

  282.     /* read subband indexes */

  283.     if(maxband){

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

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

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

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

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

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

  290.             }

  291.         }

  292.         if(c->MSS){

  293.             int mask;

  294. 

  295.             cnt = 0;

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

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

  298.                     cnt++;

  299.             t = mpc8_get_mod_golomb(gb, cnt);

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

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

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

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

  304.                     mask >>= 1;

  305.                 }

  306.         }

  307.     }

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

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

  310. 

  311.     if(keyframe){

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

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

  314.     }

  315. 

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

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

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

  319.             if(cnt >= 0){

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

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

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

  323.             }

  324.         }

  325.     }

  326. 

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

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

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

  330. 

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

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

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

  334.             }else{

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

  336.                 if(t == 64)

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

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

  339.             }

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

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

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

  343.                 else{

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

  345.                     if(t == 31)

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

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

  348.                 }

  349.             }

  350.         }

  351.     }

  352. 

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

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

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

  356.             switch(res){

  357.             case -1:

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

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

  360.                 break;

  361.             case 0:

  362.                 break;

  363.             case 1:

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

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

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

  367.                     for(k = 0; k < SAMPLES_PER_BAND / 2; k++)

  368.                         c->Q[ch][off + j + k] = t & (1 << (SAMPLES_PER_BAND / 2 - k - 1))

  369.                                                 ? (get_bits1(gb) << 1) - 1 : 0;

  370.                 }

  371.                 break;

  372.             case 2:

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

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

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

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

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

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

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

  380.                 }

  381.                 break;

  382.             case 3:

  383.             case 4:

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

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

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

  387.                     c->Q[ch][off + j + 0] = sign_extend(t, 4);

  388.                 }

  389.                 break;

  390.             case 5:

  391.             case 6:

  392.             case 7:

  393.             case 8:

  394.                 cnt = 2 * mpc8_thres[res];

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

  396.                     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];

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

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

  399.                 }

  400.                 break;

  401.             default:

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

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

  404.                     if(res != 9){

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

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

  407.                     }

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

  409.                 }

  410.             }

  411.         }

  412.     }

  413. 

  414.     frame->nb_samples = MPC_FRAME_SIZE;

  415.     if ((res = ff_get_buffer(avctx, frame, 0)) < 0)

  416.         return res;

  417. 

  418.     ff_mpc_dequantize_and_synth(c, maxband - 1,

  419.                                 (int16_t **)frame->extended_data,

  420.                                 avctx->channels);

  421. 

  422.     c->cur_frame++;

  423. 

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

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

  426.         c->cur_frame = 0;

  427.     if (get_bits_left(gb) < 0) {

  428.         av_log(avctx, AV_LOG_ERROR, "Overread %d\n", -get_bits_left(gb));

  429.         c->last_bits_used = buf_size << 3;

  430.     } else if (c->cur_frame == 0 && get_bits_left(gb) < 8) {// we have only padding left

  431.         c->last_bits_used = buf_size << 3;

  432.     }

  433. 

  434.     *got_frame_ptr = 1;

  435. 

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

  437. }

  438. 

  439. static av_cold void mpc8_decode_flush(AVCodecContext *avctx)

  440. {

  441.     MPCContext *c = avctx->priv_data;

  442.     c->cur_frame = 0;

  443. }

  444. 

  445. AVCodec ff_mpc8_decoder = {

  446.     .name           = "mpc8",

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

  448.     .type           = AVMEDIA_TYPE_AUDIO,

  449.     .id             = AV_CODEC_ID_MUSEPACK8,

  450.     .priv_data_size = sizeof(MPCContext),

  451.     .init           = mpc8_decode_init,

  452.     .decode         = mpc8_decode_frame,

  453.     .flush          = mpc8_decode_flush,

  454.     .capabilities   = AV_CODEC_CAP_DR1,

  455.     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,

  456.                                                       AV_SAMPLE_FMT_NONE },

  457. };