LCOV - code coverage report
Current view: top level - libavcodec - mpc8.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 68 236 28.8 %
Date: 2017-12-18 20:14:19 Functions: 1 7 14.3 %

          Line data    Source code
       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           0 : static inline int mpc8_dec_base(GetBitContext *gb, int k, int n)
      46             : {
      47           0 :     int len = mpc8_cnk_len[k-1][n-1] - 1;
      48           0 :     int code = len ? get_bits_long(gb, len) : 0;
      49             : 
      50           0 :     if (code >= mpc8_cnk_lost[k-1][n-1])
      51           0 :         code = ((code << 1) | get_bits1(gb)) - mpc8_cnk_lost[k-1][n-1];
      52             : 
      53           0 :     return code;
      54             : }
      55             : 
      56           0 : static inline int mpc8_dec_enum(GetBitContext *gb, int k, int n)
      57             : {
      58           0 :     int bits = 0;
      59           0 :     const uint32_t * C = mpc8_cnk[k-1];
      60           0 :     int code = mpc8_dec_base(gb, k, n);
      61             : 
      62             :     do {
      63           0 :         n--;
      64           0 :         if (code >= C[n]) {
      65           0 :             bits |= 1 << n;
      66           0 :             code -= C[n];
      67           0 :             C -= 32;
      68           0 :             k--;
      69             :         }
      70           0 :     } while(k > 0);
      71             : 
      72           0 :     return bits;
      73             : }
      74             : 
      75           0 : static inline int mpc8_get_mod_golomb(GetBitContext *gb, int m)
      76             : {
      77           0 :     if(mpc8_cnk_len[0][m] < 1) return 0;
      78           0 :     return mpc8_dec_base(gb, 1, m+1);
      79             : }
      80             : 
      81           0 : static int mpc8_get_mask(GetBitContext *gb, int size, int t)
      82             : {
      83           0 :     int mask = 0;
      84             : 
      85           0 :     if(t && t != size)
      86           0 :          mask = mpc8_dec_enum(gb, FFMIN(t, size - t), size);
      87           0 :     if((t << 1) > size) mask = ~mask;
      88             : 
      89           0 :     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           1 : static av_cold int mpc8_decode_init(AVCodecContext * avctx)
      97             : {
      98             :     int i;
      99           1 :     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           1 :     if(avctx->extradata_size < 2){
     116           0 :         av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
     117           0 :         return -1;
     118             :     }
     119           1 :     memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
     120           1 :     av_lfg_init(&c->rnd, 0xDEADBEEF);
     121           1 :     ff_mpadsp_init(&c->mpadsp);
     122             : 
     123           1 :     ff_mpc_init();
     124             : 
     125           1 :     init_get_bits(&gb, avctx->extradata, 16);
     126             : 
     127           1 :     skip_bits(&gb, 3);//sample rate
     128           1 :     c->maxbands = get_bits(&gb, 5) + 1;
     129           1 :     if (c->maxbands >= BANDS) {
     130           0 :         av_log(avctx,AV_LOG_ERROR, "maxbands %d too high\n", c->maxbands);
     131           0 :         return AVERROR_INVALIDDATA;
     132             :     }
     133           1 :     channels = get_bits(&gb, 4) + 1;
     134           1 :     if (channels > 2) {
     135           0 :         avpriv_request_sample(avctx, "Multichannel MPC SV8");
     136           0 :         return AVERROR_PATCHWELCOME;
     137             :     }
     138           1 :     c->MSS = get_bits1(&gb);
     139           1 :     c->frames = 1 << (get_bits(&gb, 3) * 2);
     140             : 
     141           1 :     avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
     142           1 :     avctx->channel_layout = (channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
     143           1 :     avctx->channels = channels;
     144             : 
     145           1 :     if(vlc_initialized) return 0;
     146           1 :     av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
     147             : 
     148           1 :     band_vlc.table = band_table;
     149           1 :     band_vlc.table_allocated = 542;
     150           1 :     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           1 :     q1_vlc.table = q1_table;
     155           1 :     q1_vlc.table_allocated = 520;
     156           1 :     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           1 :     q9up_vlc.table = q9up_table;
     160           1 :     q9up_vlc.table_allocated = 524;
     161           1 :     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           1 :     scfi_vlc[0].table = scfi0_table;
     166           1 :     scfi_vlc[0].table_allocated = 1 << MPC8_SCFI0_BITS;
     167           1 :     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           1 :     scfi_vlc[1].table = scfi1_table;
     171           1 :     scfi_vlc[1].table_allocated = 1 << MPC8_SCFI1_BITS;
     172           1 :     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           1 :     dscf_vlc[0].table = dscf0_table;
     177           1 :     dscf_vlc[0].table_allocated = 560;
     178           1 :     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           1 :     dscf_vlc[1].table = dscf1_table;
     182           1 :     dscf_vlc[1].table_allocated = 598;
     183           1 :     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           1 :     q3_vlc[0].table = q3_0_table;
     188           1 :     q3_vlc[0].table_allocated = 512;
     189           1 :     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           1 :     q3_vlc[1].table = q3_1_table;
     194           1 :     q3_vlc[1].table_allocated = 516;
     195           1 :     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           3 :     for(i = 0; i < 2; i++){
     201           2 :         res_vlc[i].table = &codes_table[vlc_offsets[0+i]];
     202           2 :         res_vlc[i].table_allocated = vlc_offsets[1+i] - vlc_offsets[0+i];
     203           2 :         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           2 :         q2_vlc[i].table = &codes_table[vlc_offsets[2+i]];
     208           2 :         q2_vlc[i].table_allocated = vlc_offsets[3+i] - vlc_offsets[2+i];
     209           2 :         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           2 :         quant_vlc[0][i].table = &codes_table[vlc_offsets[4+i]];
     214           2 :         quant_vlc[0][i].table_allocated = vlc_offsets[5+i] - vlc_offsets[4+i];
     215           2 :         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           2 :         quant_vlc[1][i].table = &codes_table[vlc_offsets[6+i]];
     219           2 :         quant_vlc[1][i].table_allocated = vlc_offsets[7+i] - vlc_offsets[6+i];
     220           2 :         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           2 :         quant_vlc[2][i].table = &codes_table[vlc_offsets[8+i]];
     224           2 :         quant_vlc[2][i].table_allocated = vlc_offsets[9+i] - vlc_offsets[8+i];
     225           2 :         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           2 :         quant_vlc[3][i].table = &codes_table[vlc_offsets[10+i]];
     229           2 :         quant_vlc[3][i].table_allocated = vlc_offsets[11+i] - vlc_offsets[10+i];
     230           2 :         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           1 :     vlc_initialized = 1;
     235             : 
     236           1 :     return 0;
     237             : }
     238             : 
     239           0 : static int mpc8_decode_frame(AVCodecContext * avctx, void *data,
     240             :                              int *got_frame_ptr, AVPacket *avpkt)
     241             : {
     242           0 :     AVFrame *frame     = data;
     243           0 :     const uint8_t *buf = avpkt->data;
     244           0 :     int buf_size = avpkt->size;
     245           0 :     MPCContext *c = avctx->priv_data;
     246           0 :     GetBitContext gb2, *gb = &gb2;
     247             :     int i, j, k, ch, cnt, res, t;
     248           0 :     Band *bands = c->bands;
     249             :     int off;
     250             :     int maxband, keyframe;
     251             :     int last[2];
     252             : 
     253             :     /* get output buffer */
     254           0 :     frame->nb_samples = MPC_FRAME_SIZE;
     255           0 :     if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
     256           0 :         return res;
     257             : 
     258           0 :     keyframe = c->cur_frame == 0;
     259             : 
     260           0 :     if(keyframe){
     261           0 :         memset(c->Q, 0, sizeof(c->Q));
     262           0 :         c->last_bits_used = 0;
     263             :     }
     264           0 :     if ((res = init_get_bits8(gb, buf, buf_size)) < 0)
     265           0 :         return res;
     266             : 
     267           0 :     skip_bits(gb, c->last_bits_used & 7);
     268             : 
     269           0 :     if(keyframe)
     270           0 :         maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1);
     271             :     else{
     272           0 :         maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2);
     273           0 :         if(maxband > 32) maxband -= 33;
     274             :     }
     275             : 
     276           0 :     if(maxband > c->maxbands + 1) {
     277           0 :         av_log(avctx, AV_LOG_ERROR, "maxband %d too large\n",maxband);
     278           0 :         return AVERROR_INVALIDDATA;
     279             :     }
     280           0 :     c->last_max_band = maxband;
     281             : 
     282             :     /* read subband indexes */
     283           0 :     if(maxband){
     284           0 :         last[0] = last[1] = 0;
     285           0 :         for(i = maxband - 1; i >= 0; i--){
     286           0 :             for(ch = 0; ch < 2; ch++){
     287           0 :                 last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch];
     288           0 :                 if(last[ch] > 15) last[ch] -= 17;
     289           0 :                 bands[i].res[ch] = last[ch];
     290             :             }
     291             :         }
     292           0 :         if(c->MSS){
     293             :             int mask;
     294             : 
     295           0 :             cnt = 0;
     296           0 :             for(i = 0; i < maxband; i++)
     297           0 :                 if(bands[i].res[0] || bands[i].res[1])
     298           0 :                     cnt++;
     299           0 :             t = mpc8_get_mod_golomb(gb, cnt);
     300           0 :             mask = mpc8_get_mask(gb, cnt, t);
     301           0 :             for(i = maxband - 1; i >= 0; i--)
     302           0 :                 if(bands[i].res[0] || bands[i].res[1]){
     303           0 :                     bands[i].msf = mask & 1;
     304           0 :                     mask >>= 1;
     305             :                 }
     306             :         }
     307             :     }
     308           0 :     for(i = maxband; i < c->maxbands; i++)
     309           0 :         bands[i].res[0] = bands[i].res[1] = 0;
     310             : 
     311           0 :     if(keyframe){
     312           0 :         for(i = 0; i < 32; i++)
     313           0 :             c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1;
     314             :     }
     315             : 
     316           0 :     for(i = 0; i < maxband; i++){
     317           0 :         if(bands[i].res[0] || bands[i].res[1]){
     318           0 :             cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1;
     319           0 :             if(cnt >= 0){
     320           0 :                 t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1);
     321           0 :                 if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt);
     322           0 :                 if(bands[i].res[1]) bands[i].scfi[1] = t & 3;
     323             :             }
     324             :         }
     325             :     }
     326             : 
     327           0 :     for(i = 0; i < maxband; i++){
     328           0 :         for(ch = 0; ch < 2; ch++){
     329           0 :             if(!bands[i].res[ch]) continue;
     330             : 
     331           0 :             if(c->oldDSCF[ch][i]){
     332           0 :                 bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6;
     333           0 :                 c->oldDSCF[ch][i] = 0;
     334             :             }else{
     335           0 :                 t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2);
     336           0 :                 if(t == 64)
     337           0 :                     t += get_bits(gb, 6);
     338           0 :                 bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6;
     339             :             }
     340           0 :             for(j = 0; j < 2; j++){
     341           0 :                 if((bands[i].scfi[ch] << j) & 2)
     342           0 :                     bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j];
     343             :                 else{
     344           0 :                     t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2);
     345           0 :                     if(t == 31)
     346           0 :                         t = 64 + get_bits(gb, 6);
     347           0 :                     bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6;
     348             :                 }
     349             :             }
     350             :         }
     351             :     }
     352             : 
     353           0 :     for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){
     354           0 :         for(ch = 0; ch < 2; ch++){
     355           0 :             res = bands[i].res[ch];
     356           0 :             switch(res){
     357           0 :             case -1:
     358           0 :                 for(j = 0; j < SAMPLES_PER_BAND; j++)
     359           0 :                     c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
     360           0 :                 break;
     361           0 :             case 0:
     362           0 :                 break;
     363           0 :             case 1:
     364           0 :                 for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){
     365           0 :                     cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2);
     366           0 :                     t = mpc8_get_mask(gb, 18, cnt);
     367           0 :                     for(k = 0; k < SAMPLES_PER_BAND / 2; k++, t <<= 1)
     368           0 :                         c->Q[ch][off + j + k] = (t & 0x20000) ? (get_bits1(gb) << 1) - 1 : 0;
     369             :                 }
     370           0 :                 break;
     371           0 :             case 2:
     372           0 :                 cnt = 6;//2*mpc8_thres[res]
     373           0 :                 for(j = 0; j < SAMPLES_PER_BAND; j += 3){
     374           0 :                     t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2);
     375           0 :                     c->Q[ch][off + j + 0] = mpc8_idx50[t];
     376           0 :                     c->Q[ch][off + j + 1] = mpc8_idx51[t];
     377           0 :                     c->Q[ch][off + j + 2] = mpc8_idx52[t];
     378           0 :                     cnt = (cnt >> 1) + mpc8_huffq2[t];
     379             :                 }
     380           0 :                 break;
     381           0 :             case 3:
     382             :             case 4:
     383           0 :                 for(j = 0; j < SAMPLES_PER_BAND; j += 2){
     384           0 :                     t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2) + q3_offsets[res - 3];
     385           0 :                     c->Q[ch][off + j + 1] = t >> 4;
     386           0 :                     c->Q[ch][off + j + 0] = (t & 8) ? (t & 0xF) - 16 : (t & 0xF);
     387             :                 }
     388           0 :                 break;
     389           0 :             case 5:
     390             :             case 6:
     391             :             case 7:
     392             :             case 8:
     393           0 :                 cnt = 2 * mpc8_thres[res];
     394           0 :                 for(j = 0; j < SAMPLES_PER_BAND; j++){
     395           0 :                     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];
     396           0 :                     c->Q[ch][off + j] = t;
     397           0 :                     cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]);
     398             :                 }
     399           0 :                 break;
     400           0 :             default:
     401           0 :                 for(j = 0; j < SAMPLES_PER_BAND; j++){
     402           0 :                     c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2);
     403           0 :                     if(res != 9){
     404           0 :                         c->Q[ch][off + j] <<= res - 9;
     405           0 :                         c->Q[ch][off + j] |= get_bits(gb, res - 9);
     406             :                     }
     407           0 :                     c->Q[ch][off + j] -= (1 << (res - 2)) - 1;
     408             :                 }
     409             :             }
     410             :         }
     411             :     }
     412             : 
     413           0 :     ff_mpc_dequantize_and_synth(c, maxband - 1,
     414           0 :                                 (int16_t **)frame->extended_data,
     415             :                                 avctx->channels);
     416             : 
     417           0 :     c->cur_frame++;
     418             : 
     419           0 :     c->last_bits_used = get_bits_count(gb);
     420           0 :     if(c->cur_frame >= c->frames)
     421           0 :         c->cur_frame = 0;
     422           0 :     if(c->cur_frame == 0 && get_bits_left(gb) < 8) {// we have only padding left
     423           0 :         c->last_bits_used = buf_size << 3;
     424           0 :     } else if (get_bits_left(gb) < 0) {
     425           0 :         av_log(avctx, AV_LOG_ERROR, "Overread %d\n", -get_bits_left(gb));
     426           0 :         c->last_bits_used = buf_size << 3;
     427             :     }
     428             : 
     429           0 :     *got_frame_ptr = 1;
     430             : 
     431           0 :     return c->cur_frame ? c->last_bits_used >> 3 : buf_size;
     432             : }
     433             : 
     434           0 : static av_cold void mpc8_decode_flush(AVCodecContext *avctx)
     435             : {
     436           0 :     MPCContext *c = avctx->priv_data;
     437           0 :     c->cur_frame = 0;
     438           0 : }
     439             : 
     440             : AVCodec ff_mpc8_decoder = {
     441             :     .name           = "mpc8",
     442             :     .long_name      = NULL_IF_CONFIG_SMALL("Musepack SV8"),
     443             :     .type           = AVMEDIA_TYPE_AUDIO,
     444             :     .id             = AV_CODEC_ID_MUSEPACK8,
     445             :     .priv_data_size = sizeof(MPCContext),
     446             :     .init           = mpc8_decode_init,
     447             :     .decode         = mpc8_decode_frame,
     448             :     .flush          = mpc8_decode_flush,
     449             :     .capabilities   = AV_CODEC_CAP_DR1,
     450             :     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
     451             :                                                       AV_SAMPLE_FMT_NONE },
     452             : };

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