falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
44689 Commits
32 Branches
824MB
Tree: c5714b51aa
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'c5714b51aa'
${ noResults }
FFmpeg/libavcodec/mpc8.c

442 lines
16KB
Raw Blame History 

  1. /*

  2.  * Musepack SV8 decoder

  3.  * Copyright (c) 2007 Konstantin Shishkov

  4.  *

  5.  * This file is part of Libav.

  6.  *

  7.  * Libav 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.  * Libav 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 Libav; 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. 

  31. #include "avcodec.h"

  32. #include "bitstream.h"

  33. #include "internal.h"

  34. #include "mpegaudiodsp.h"

  35. 

  36. #include "mpc.h"

  37. #include "mpc8data.h"

  38. #include "mpc8huff.h"

  39. 

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

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

  42. 

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

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

  45. 

  46. static inline int mpc8_dec_base(BitstreamContext *bc, int k, int n)

  47. {

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

  49.     int code = len ? bitstream_read(bc, len) : 0;

  50. 

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

  52.         code = ((code << 1) | bitstream_read_bit(bc)) - mpc8_cnk_lost[k - 1][n - 1];

  53. 

  54.     return code;

  55. }

  56. 

  57. static inline int mpc8_dec_enum(BitstreamContext *bc, int k, int n)

  58. {

  59.     int bits = 0;

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

  61.     int code = mpc8_dec_base(bc, k, n);

  62. 

  63.     do {

  64.         n--;

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

  66.             bits |= 1 << n;

  67.             code -= C[n];

  68.             C -= 32;

  69.             k--;

  70.         }

  71.     } while(k > 0);

  72. 

  73.     return bits;

  74. }

  75. 

  76. static inline int mpc8_get_mod_golomb(BitstreamContext *bc, int m)

  77. {

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

  79.     return mpc8_dec_base(bc, 1, m + 1);

  80. }

  81. 

  82. static int mpc8_get_mask(BitstreamContext *bc, int size, int t)

  83. {

  84.     int mask = 0;

  85. 

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

  87.          mask = mpc8_dec_enum(bc, FFMIN(t, size - t), size);

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

  89. 

  90.     return mask;

  91. }

  92. 

  93. static const uint16_t vlc_offsets[13] = {

  94.     0, 640, 1184, 1748, 2298, 2426, 2554, 3066, 3578, 4106, 4618, 5196, 5708

  95. };

  96. 

  97. static av_cold int mpc8_decode_init(AVCodecContext * avctx)

  98. {

  99.     int i;

  100.     MPCContext *c = avctx->priv_data;

  101.     BitstreamContext bc;

  102.     static int vlc_initialized = 0;

  103.     int channels;

  104. 

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

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

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

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

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

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

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

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

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

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

  115. 

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

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

  118.         return -1;

  119.     }

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

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

  122.     ff_mpadsp_init(&c->mpadsp);

  123. 

  124.     ff_mpc_init();

  125. 

  126.     bitstream_init(&bc, avctx->extradata, 16);

  127. 

  128.     bitstream_skip(&bc, 3); // sample rate

  129.     c->maxbands = bitstream_read(&bc, 5) + 1;

  130.     channels    = bitstream_read(&bc, 4) + 1;

  131.     if (channels > 2) {

  132.         avpriv_request_sample(avctx, "Multichannel MPC SV8");

  133.         return AVERROR_PATCHWELCOME;

  134.     }

  135.     c->MSS    = bitstream_read_bit(&bc);

  136.     c->frames = 1 << (bitstream_read(&bc, 3) * 2);

  137. 

  138.     avctx->sample_fmt = AV_SAMPLE_FMT_S16P;

  139.     avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;

  140. 

  141.     if(vlc_initialized) return 0;

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

  143. 

  144.     band_vlc.table = band_table;

  145.     band_vlc.table_allocated = 542;

  146.     init_vlc(&band_vlc, MPC8_BANDS_BITS, MPC8_BANDS_SIZE,

  147.              mpc8_bands_bits,  1, 1,

  148.              mpc8_bands_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);

  149. 

  150.     q1_vlc.table = q1_table;

  151.     q1_vlc.table_allocated = 520;

  152.     init_vlc(&q1_vlc, MPC8_Q1_BITS, MPC8_Q1_SIZE,

  153.              mpc8_q1_bits,  1, 1,

  154.              mpc8_q1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);

  155.     q9up_vlc.table = q9up_table;

  156.     q9up_vlc.table_allocated = 524;

  157.     init_vlc(&q9up_vlc, MPC8_Q9UP_BITS, MPC8_Q9UP_SIZE,

  158.              mpc8_q9up_bits,  1, 1,

  159.              mpc8_q9up_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);

  160. 

  161.     scfi_vlc[0].table = scfi0_table;

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

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

  164.              mpc8_scfi0_bits,  1, 1,

  165.              mpc8_scfi0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);

  166.     scfi_vlc[1].table = scfi1_table;

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

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

  169.              mpc8_scfi1_bits,  1, 1,

  170.              mpc8_scfi1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);

  171. 

  172.     dscf_vlc[0].table = dscf0_table;

  173.     dscf_vlc[0].table_allocated = 560;

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

  175.              mpc8_dscf0_bits,  1, 1,

  176.              mpc8_dscf0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);

  177.     dscf_vlc[1].table = dscf1_table;

  178.     dscf_vlc[1].table_allocated = 598;

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

  180.              mpc8_dscf1_bits,  1, 1,

  181.              mpc8_dscf1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);

  182. 

  183.     q3_vlc[0].table = q3_0_table;

  184.     q3_vlc[0].table_allocated = 512;

  185.     ff_init_vlc_sparse(&q3_vlc[0], MPC8_Q3_BITS, MPC8_Q3_SIZE,

  186.              mpc8_q3_bits,  1, 1,

  187.              mpc8_q3_codes, 1, 1,

  188.              mpc8_q3_syms,  1, 1, INIT_VLC_USE_NEW_STATIC);

  189.     q3_vlc[1].table = q3_1_table;

  190.     q3_vlc[1].table_allocated = 516;

  191.     ff_init_vlc_sparse(&q3_vlc[1], MPC8_Q4_BITS, MPC8_Q4_SIZE,

  192.              mpc8_q4_bits,  1, 1,

  193.              mpc8_q4_codes, 1, 1,

  194.              mpc8_q4_syms,  1, 1, INIT_VLC_USE_NEW_STATIC);

  195. 

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

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

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

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

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

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

  202. 

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

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

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

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

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

  208. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  229.     }

  230.     vlc_initialized = 1;

  231. 

  232.     return 0;

  233. }

  234. 

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

  236.                              int *got_frame_ptr, AVPacket *avpkt)

  237. {

  238.     AVFrame *frame     = data;

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

  240.     int buf_size = avpkt->size;

  241.     MPCContext *c = avctx->priv_data;

  242.     BitstreamContext bc2, *bc = &bc2;

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

  244.     Band *bands = c->bands;

  245.     int off;

  246.     int maxband, keyframe;

  247.     int last[2];

  248. 

  249.     /* get output buffer */

  250.     frame->nb_samples = MPC_FRAME_SIZE;

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

  252.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  253.         return res;

  254.     }

  255. 

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

  257. 

  258.     if(keyframe){

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

  260.         c->last_bits_used = 0;

  261.     }

  262.     bitstream_init8(bc, buf, buf_size);

  263.     bitstream_skip(bc, c->last_bits_used & 7);

  264. 

  265.     if(keyframe)

  266.         maxband = mpc8_get_mod_golomb(bc, c->maxbands + 1);

  267.     else{

  268.         maxband = c->last_max_band + bitstream_read_vlc(bc, band_vlc.table, MPC8_BANDS_BITS, 2);

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

  270.     }

  271.     if(maxband > c->maxbands + 1)

  272.         return AVERROR_INVALIDDATA;

  273.     c->last_max_band = maxband;

  274. 

  275.     /* read subband indexes */

  276.     if(maxband){

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

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

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

  280.                 last[ch] = bitstream_read_vlc(bc, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch];

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

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

  283.             }

  284.         }

  285.         if(c->MSS){

  286.             int mask;

  287. 

  288.             cnt = 0;

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

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

  291.                     cnt++;

  292.             t = mpc8_get_mod_golomb(bc, cnt);

  293.             mask = mpc8_get_mask(bc, cnt, t);

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

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

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

  297.                     mask >>= 1;

  298.                 }

  299.         }

  300.     }

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

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

  303. 

  304.     if(keyframe){

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

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

  307.     }

  308. 

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

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

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

  312.             if(cnt >= 0){

  313.                 t = bitstream_read_vlc(bc, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1);

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

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

  316.             }

  317.         }

  318.     }

  319. 

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

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

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

  323. 

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

  325.                 bands[i].scf_idx[ch][0] = bitstream_read(bc, 7) - 6;

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

  327.             }else{

  328.                 t = bitstream_read_vlc(bc, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2);

  329.                 if(t == 64)

  330.                     t += bitstream_read(bc, 6);

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

  332.             }

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

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

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

  336.                 else{

  337.                     t = bitstream_read_vlc(bc, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2);

  338.                     if(t == 31)

  339.                         t = 64 + bitstream_read(bc, 6);

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

  341.                 }

  342.             }

  343.         }

  344.     }

  345. 

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

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

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

  349.             switch(res){

  350.             case -1:

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

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

  353.                 break;

  354.             case 0:

  355.                 break;

  356.             case 1:

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

  358.                     cnt = bitstream_read_vlc(bc, q1_vlc.table, MPC8_Q1_BITS, 2);

  359.                     t = mpc8_get_mask(bc, 18, cnt);

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

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

  362.                 }

  363.                 break;

  364.             case 2:

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

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

  367.                     t = bitstream_read_vlc(bc, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2);

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

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

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

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

  372.                 }

  373.                 break;

  374.             case 3:

  375.             case 4:

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

  377.                     t = bitstream_read_vlc(bc, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2) + q3_offsets[res - 3];

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

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

  380.                 }

  381.                 break;

  382.             case 5:

  383.             case 6:

  384.             case 7:

  385.             case 8:

  386.                 cnt = 2 * mpc8_thres[res];

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

  388.                     t = bitstream_read_vlc(bc, quant_vlc[res - 5][cnt > mpc8_thres[res]].table, quant_vlc[res - 5][cnt > mpc8_thres[res]].bits, 2) + quant_offsets[res - 5];

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

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

  391.                 }

  392.                 break;

  393.             default:

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

  395.                     c->Q[ch][off + j] = bitstream_read_vlc(bc, q9up_vlc.table, MPC8_Q9UP_BITS, 2);

  396.                     if(res != 9){

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

  398.                         c->Q[ch][off + j] |= bitstream_read(bc, res - 9);

  399.                     }

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

  401.                 }

  402.             }

  403.         }

  404.     }

  405. 

  406.     ff_mpc_dequantize_and_synth(c, maxband - 1,

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

  408.                                 avctx->channels);

  409. 

  410.     c->cur_frame++;

  411. 

  412.     c->last_bits_used = bitstream_tell(bc);

  413.     if (bitstream_bits_left(bc) < 8) // we have only padding left

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

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

  416.         c->cur_frame = 0;

  417. 

  418.     *got_frame_ptr = 1;

  419. 

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

  421. }

  422. 

  423. static av_cold void mpc8_decode_flush(AVCodecContext *avctx)

  424. {

  425.     MPCContext *c = avctx->priv_data;

  426.     c->cur_frame = 0;

  427. }

  428. 

  429. AVCodec ff_mpc8_decoder = {

  430.     .name           = "mpc8",

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

  432.     .type           = AVMEDIA_TYPE_AUDIO,

  433.     .id             = AV_CODEC_ID_MUSEPACK8,

  434.     .priv_data_size = sizeof(MPCContext),

  435.     .init           = mpc8_decode_init,

  436.     .decode         = mpc8_decode_frame,

  437.     .flush          = mpc8_decode_flush,

  438.     .capabilities   = AV_CODEC_CAP_DR1,

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

  440.                                                       AV_SAMPLE_FMT_NONE },

  441. };