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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 inline int mpc8_dec_base(GetBitContext *gb, int k, int n)

  43. {

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

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

  46. 

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

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

  49. 

  50.     return code;

  51. }

  52. 

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

  54. {

  55.     int bits = 0;

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

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

  58. 

  59.     do {

  60.         n--;

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

  62.             bits |= 1U << n;

  63.             code -= C[n];

  64.             C -= 32;

  65.             k--;

  66.         }

  67.     } while(k > 0);

  68. 

  69.     return bits;

  70. }

  71. 

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

  73. {

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

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

  76. }

  77. 

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

  79. {

  80.     int mask = 0;

  81. 

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

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

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

  85. 

  86.     return mask;

  87. }

  88. 

  89. static const uint16_t vlc_offsets[13] = {

  90.     0, 640, 1184, 1748, 2298, 2426, 2554, 3066, 3578, 4106, 4618, 5196, 5708

  91. };

  92. 

  93. static av_cold void build_vlc(VLC *vlc, int nb_bits,

  94.                               const uint8_t codes_counts[16],

  95.                               const uint8_t syms[], int offset)

  96. {

  97.     uint8_t len[MPC8_MAX_VLC_SIZE];

  98.     unsigned num = 0;

  99. 

  100.     for (int i = 16; i > 0; i--)

  101.         for (unsigned tmp = num + codes_counts[i - 1]; num < tmp; num++)

  102.             len[num] = i;

  103. 

  104.     ff_init_vlc_from_lengths(vlc, nb_bits, num, len, 1,

  105.                              syms, 1, 1, offset, INIT_VLC_USE_NEW_STATIC, NULL);

  106. }

  107. 

  108. static av_cold int mpc8_decode_init(AVCodecContext * avctx)

  109. {

  110.     int i;

  111.     MPCContext *c = avctx->priv_data;

  112.     GetBitContext gb;

  113.     static int vlc_initialized = 0;

  114.     int channels;

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

  116. 

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

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

  119.         return -1;

  120.     }

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

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

  123.     ff_mpadsp_init(&c->mpadsp);

  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. #define INIT_VLC(vlc, bits, len_counts, symbols, offset, static_size) \

  149.     do {                                                                   \

  150.         static VLC_TYPE table[static_size][2];                             \

  151.         (vlc)->table           = table;                                    \

  152.         (vlc)->table_allocated = static_size;                              \

  153.         build_vlc(vlc, bits, len_counts, symbols, offset);                 \

  154.     } while (0)

  155. 

  156. 

  157.     INIT_VLC(&band_vlc, MPC8_BANDS_BITS,

  158.              mpc8_bands_len_counts, mpc8_bands_syms, 0, 542);

  159. 

  160.     INIT_VLC(&q1_vlc, MPC8_Q1_BITS,

  161.              mpc8_q1_len_counts, mpc8_q1_syms, 0, 520);

  162.     INIT_VLC(&q9up_vlc, MPC8_Q9UP_BITS,

  163.              mpc8_q9up_len_counts, mpc8_q9up_syms, 0, 524);

  164. 

  165.     INIT_VLC(&scfi_vlc[0], MPC8_SCFI0_BITS,

  166.              mpc8_scfi_len_counts[0], mpc8_scfi0_syms, 0, 1 << MPC8_SCFI0_BITS);

  167.     INIT_VLC(&scfi_vlc[1], MPC8_SCFI1_BITS,

  168.              mpc8_scfi_len_counts[1], mpc8_scfi1_syms, 0, 1 << MPC8_SCFI1_BITS);

  169. 

  170.     INIT_VLC(&dscf_vlc[0], MPC8_DSCF0_BITS,

  171.              mpc8_dscf_len_counts[0], mpc8_dscf0_syms, 0, 560);

  172.     INIT_VLC(&dscf_vlc[1], MPC8_DSCF1_BITS,

  173.              mpc8_dscf_len_counts[1], mpc8_dscf1_syms, 0, 598);

  174. 

  175.     INIT_VLC(&q3_vlc[0], MPC8_Q3_BITS,

  176.              mpc8_q3_len_counts, mpc8_q3_syms, MPC8_Q3_OFFSET, 512);

  177.     INIT_VLC(&q3_vlc[1], MPC8_Q4_BITS,

  178.              mpc8_q4_len_counts, mpc8_q4_syms, MPC8_Q4_OFFSET, 516);

  179. 

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

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

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

  183.         build_vlc(&res_vlc[i], MPC8_RES_BITS,

  184.                   mpc8_res_len_counts[i], mpc8_res_syms[i], 0);

  185. 

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

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

  188.         build_vlc(&q2_vlc[i], MPC8_Q2_BITS,

  189.                   mpc8_q2_len_counts[i], mpc8_q2_syms[i], 0);

  190. 

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

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

  193.         build_vlc(&quant_vlc[0][i], MPC8_Q5_BITS,

  194.                   mpc8_q5_len_counts[i], mpc8_q5_syms[i], MPC8_Q5_OFFSET);

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

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

  197.         build_vlc(&quant_vlc[1][i], MPC8_Q6_BITS,

  198.                   mpc8_q6_len_counts[i], mpc8_q6_syms[i], MPC8_Q6_OFFSET);

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

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

  201.         build_vlc(&quant_vlc[2][i], MPC8_Q7_BITS,

  202.                   mpc8_q7_len_counts[i], mpc8_q7_syms[i], MPC8_Q7_OFFSET);

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

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

  205.         build_vlc(&quant_vlc[3][i], MPC8_Q8_BITS,

  206.                   mpc8_q8_len_counts[i], mpc8_q8_syms[i], MPC8_Q8_OFFSET);

  207.     }

  208.     vlc_initialized = 1;

  209.     ff_mpa_synth_init_fixed();

  210. 

  211.     return 0;

  212. }

  213. 

  214. static int mpc8_decode_frame(AVCodecContext * avctx, void *data,

  215.                              int *got_frame_ptr, AVPacket *avpkt)

  216. {

  217.     AVFrame *frame     = data;

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

  219.     int buf_size = avpkt->size;

  220.     MPCContext *c = avctx->priv_data;

  221.     GetBitContext gb2, *gb = &gb2;

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

  223.     Band *bands = c->bands;

  224.     int off;

  225.     int maxband, keyframe;

  226.     int last[2];

  227. 

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

  229. 

  230.     if(keyframe){

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

  232.         c->last_bits_used = 0;

  233.     }

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

  235.         return res;

  236. 

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

  238. 

  239.     if(keyframe)

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

  241.     else{

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

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

  244.     }

  245. 

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

  247.         *got_frame_ptr = 0;

  248.         return buf_size;

  249.     }

  250. 

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

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

  253.         return AVERROR_INVALIDDATA;

  254.     }

  255.     c->last_max_band = maxband;

  256. 

  257.     /* read subband indexes */

  258.     if(maxband){

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

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

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

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

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

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

  265.             }

  266.         }

  267.         if(c->MSS){

  268.             int mask;

  269. 

  270.             cnt = 0;

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

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

  273.                     cnt++;

  274.             t = mpc8_get_mod_golomb(gb, cnt);

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

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

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

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

  279.                     mask >>= 1;

  280.                 }

  281.         }

  282.     }

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

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

  285. 

  286.     if(keyframe){

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

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

  289.     }

  290. 

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

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

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

  294.             if(cnt >= 0){

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

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

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

  298.             }

  299.         }

  300.     }

  301. 

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

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

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

  305. 

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

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

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

  309.             }else{

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

  311.                 if(t == 64)

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

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

  314.             }

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

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

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

  318.                 else{

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

  320.                     if(t == 31)

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

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

  323.                 }

  324.             }

  325.         }

  326.     }

  327. 

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

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

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

  331.             switch(res){

  332.             case -1:

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

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

  335.                 break;

  336.             case 0:

  337.                 break;

  338.             case 1:

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

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

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

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

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

  344.                                                 ? (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);

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

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

  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.                     const VLC *vlc = &quant_vlc[res - 5][cnt > mpc8_thres[res]];

  372.                     c->Q[ch][off + j] = get_vlc2(gb, vlc->table, vlc->bits, 2);

  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.     frame->nb_samples = MPC_FRAME_SIZE;

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

  391.         return res;

  392. 

  393.     ff_mpc_dequantize_and_synth(c, maxband - 1,

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

  395.                                 avctx->channels);

  396. 

  397.     c->cur_frame++;

  398. 

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

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

  401.         c->cur_frame = 0;

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

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

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

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

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

  407.     }

  408. 

  409.     *got_frame_ptr = 1;

  410. 

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

  412. }

  413. 

  414. static av_cold void mpc8_decode_flush(AVCodecContext *avctx)

  415. {

  416.     MPCContext *c = avctx->priv_data;

  417.     c->cur_frame = 0;

  418. }

  419. 

  420. AVCodec ff_mpc8_decoder = {

  421.     .name           = "mpc8",

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

  423.     .type           = AVMEDIA_TYPE_AUDIO,

  424.     .id             = AV_CODEC_ID_MUSEPACK8,

  425.     .priv_data_size = sizeof(MPCContext),

  426.     .init           = mpc8_decode_init,

  427.     .decode         = mpc8_decode_frame,

  428.     .flush          = mpc8_decode_flush,

  429.     .capabilities   = AV_CODEC_CAP_DR1,

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

  431.                                                       AV_SAMPLE_FMT_NONE },

  432. };