LCOV - code coverage report
Current view: top level - libavcodec - mpc7.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 149 186 80.1 %
Date: 2017-12-16 13:57:32 Functions: 5 6 83.3 %

          Line data    Source code
       1             : /*
       2             :  * Musepack SV7 decoder
       3             :  * Copyright (c) 2006 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/internal.h"
      30             : #include "libavutil/lfg.h"
      31             : #include "avcodec.h"
      32             : #include "get_bits.h"
      33             : #include "internal.h"
      34             : #include "mpegaudiodsp.h"
      35             : 
      36             : #include "mpc.h"
      37             : #include "mpc7data.h"
      38             : 
      39             : static VLC scfi_vlc, dscf_vlc, hdr_vlc, quant_vlc[MPC7_QUANT_VLC_TABLES][2];
      40             : 
      41             : static const uint16_t quant_offsets[MPC7_QUANT_VLC_TABLES*2 + 1] =
      42             : {
      43             :        0, 512, 1024, 1536, 2052, 2564, 3076, 3588, 4100, 4612, 5124,
      44             :        5636, 6164, 6676, 7224
      45             : };
      46             : 
      47             : 
      48           3 : static av_cold int mpc7_decode_init(AVCodecContext * avctx)
      49             : {
      50             :     int i, j, ret;
      51           3 :     MPCContext *c = avctx->priv_data;
      52             :     GetBitContext gb;
      53           3 :     LOCAL_ALIGNED_16(uint8_t, buf, [16]);
      54             :     static int vlc_initialized = 0;
      55             : 
      56             :     static VLC_TYPE scfi_table[1 << MPC7_SCFI_BITS][2];
      57             :     static VLC_TYPE dscf_table[1 << MPC7_DSCF_BITS][2];
      58             :     static VLC_TYPE hdr_table[1 << MPC7_HDR_BITS][2];
      59             :     static VLC_TYPE quant_tables[7224][2];
      60             : 
      61             :     /* Musepack SV7 is always stereo */
      62           3 :     if (avctx->channels != 2) {
      63           0 :         avpriv_request_sample(avctx, "%d channels", avctx->channels);
      64           0 :         return AVERROR_PATCHWELCOME;
      65             :     }
      66             : 
      67           3 :     if(avctx->extradata_size < 16){
      68           0 :         av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
      69           0 :         return AVERROR_INVALIDDATA;
      70             :     }
      71           3 :     memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
      72           3 :     av_lfg_init(&c->rnd, 0xDEADBEEF);
      73           3 :     ff_bswapdsp_init(&c->bdsp);
      74           3 :     ff_mpadsp_init(&c->mpadsp);
      75           3 :     c->bdsp.bswap_buf((uint32_t *) buf, (const uint32_t *) avctx->extradata, 4);
      76           3 :     ff_mpc_init();
      77           3 :     init_get_bits(&gb, buf, 128);
      78             : 
      79           3 :     c->IS = get_bits1(&gb);
      80           3 :     c->MSS = get_bits1(&gb);
      81           3 :     c->maxbands = get_bits(&gb, 6);
      82           3 :     if(c->maxbands >= BANDS){
      83           0 :         av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->maxbands);
      84           0 :         return AVERROR_INVALIDDATA;
      85             :     }
      86           3 :     skip_bits_long(&gb, 88);
      87           3 :     c->gapless = get_bits1(&gb);
      88           3 :     c->lastframelen = get_bits(&gb, 11);
      89           3 :     av_log(avctx, AV_LOG_DEBUG, "IS: %d, MSS: %d, TG: %d, LFL: %d, bands: %d\n",
      90             :             c->IS, c->MSS, c->gapless, c->lastframelen, c->maxbands);
      91           3 :     c->frames_to_skip = 0;
      92             : 
      93           3 :     avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
      94           3 :     avctx->channel_layout = AV_CH_LAYOUT_STEREO;
      95             : 
      96           3 :     if(vlc_initialized) return 0;
      97           2 :     av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
      98           2 :     scfi_vlc.table = scfi_table;
      99           2 :     scfi_vlc.table_allocated = 1 << MPC7_SCFI_BITS;
     100           2 :     if ((ret = init_vlc(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE,
     101             :                 &mpc7_scfi[1], 2, 1,
     102             :                 &mpc7_scfi[0], 2, 1, INIT_VLC_USE_NEW_STATIC))) {
     103           0 :         av_log(avctx, AV_LOG_ERROR, "Cannot init SCFI VLC\n");
     104           0 :         return ret;
     105             :     }
     106           2 :     dscf_vlc.table = dscf_table;
     107           2 :     dscf_vlc.table_allocated = 1 << MPC7_DSCF_BITS;
     108           2 :     if ((ret = init_vlc(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE,
     109             :                 &mpc7_dscf[1], 2, 1,
     110             :                 &mpc7_dscf[0], 2, 1, INIT_VLC_USE_NEW_STATIC))) {
     111           0 :         av_log(avctx, AV_LOG_ERROR, "Cannot init DSCF VLC\n");
     112           0 :         return ret;
     113             :     }
     114           2 :     hdr_vlc.table = hdr_table;
     115           2 :     hdr_vlc.table_allocated = 1 << MPC7_HDR_BITS;
     116           2 :     if ((ret = init_vlc(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE,
     117             :                 &mpc7_hdr[1], 2, 1,
     118             :                 &mpc7_hdr[0], 2, 1, INIT_VLC_USE_NEW_STATIC))) {
     119           0 :         av_log(avctx, AV_LOG_ERROR, "Cannot init HDR VLC\n");
     120           0 :         return ret;
     121             :     }
     122          16 :     for(i = 0; i < MPC7_QUANT_VLC_TABLES; i++){
     123          42 :         for(j = 0; j < 2; j++){
     124          28 :             quant_vlc[i][j].table = &quant_tables[quant_offsets[i*2 + j]];
     125          28 :             quant_vlc[i][j].table_allocated = quant_offsets[i*2 + j + 1] - quant_offsets[i*2 + j];
     126          28 :             if ((ret = init_vlc(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i],
     127             :                         &mpc7_quant_vlc[i][j][1], 4, 2,
     128             :                         &mpc7_quant_vlc[i][j][0], 4, 2, INIT_VLC_USE_NEW_STATIC))) {
     129           0 :                 av_log(avctx, AV_LOG_ERROR, "Cannot init QUANT VLC %i,%i\n",i,j);
     130           0 :                 return ret;
     131             :             }
     132             :         }
     133             :     }
     134           2 :     vlc_initialized = 1;
     135             : 
     136           2 :     return 0;
     137             : }
     138             : 
     139             : /**
     140             :  * Fill samples for given subband
     141             :  */
     142       29184 : static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst)
     143             : {
     144             :     int i, i1, t;
     145       29184 :     switch(idx){
     146           0 :     case -1:
     147           0 :         for(i = 0; i < SAMPLES_PER_BAND; i++){
     148           0 :             *dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
     149             :         }
     150           0 :         break;
     151        3499 :     case 1:
     152        3499 :         i1 = get_bits1(gb);
     153       45487 :         for(i = 0; i < SAMPLES_PER_BAND/3; i++){
     154       41988 :             t = get_vlc2(gb, quant_vlc[0][i1].table, 9, 2);
     155       41988 :             *dst++ = mpc7_idx30[t];
     156       41988 :             *dst++ = mpc7_idx31[t];
     157       41988 :             *dst++ = mpc7_idx32[t];
     158             :         }
     159        3499 :         break;
     160        6128 :     case 2:
     161        6128 :         i1 = get_bits1(gb);
     162      116432 :         for(i = 0; i < SAMPLES_PER_BAND/2; i++){
     163      110304 :             t = get_vlc2(gb, quant_vlc[1][i1].table, 9, 2);
     164      110304 :             *dst++ = mpc7_idx50[t];
     165      110304 :             *dst++ = mpc7_idx51[t];
     166             :         }
     167        6128 :         break;
     168        7935 :     case  3: case  4: case  5: case  6: case  7:
     169        7935 :         i1 = get_bits1(gb);
     170      293595 :         for(i = 0; i < SAMPLES_PER_BAND; i++)
     171      285660 :             *dst++ = get_vlc2(gb, quant_vlc[idx-1][i1].table, 9, 2) - mpc7_quant_vlc_off[idx-1];
     172        7935 :         break;
     173         720 :     case  8: case  9: case 10: case 11: case 12:
     174             :     case 13: case 14: case 15: case 16: case 17:
     175         720 :         t = (1 << (idx - 2)) - 1;
     176       26640 :         for(i = 0; i < SAMPLES_PER_BAND; i++)
     177       25920 :             *dst++ = get_bits(gb, idx - 1) - t;
     178         720 :         break;
     179       10902 :     default: // case 0 and -2..-17
     180       10902 :         return;
     181             :     }
     182             : }
     183             : 
     184       31340 : static int get_scale_idx(GetBitContext *gb, int ref)
     185             : {
     186       31340 :     int t = get_vlc2(gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7;
     187       31340 :     if (t == 8)
     188        3784 :         return get_bits(gb, 6);
     189       27556 :     return ref + t;
     190             : }
     191             : 
     192         456 : static int mpc7_decode_frame(AVCodecContext * avctx, void *data,
     193             :                              int *got_frame_ptr, AVPacket *avpkt)
     194             : {
     195         456 :     AVFrame *frame     = data;
     196         456 :     const uint8_t *buf = avpkt->data;
     197             :     int buf_size;
     198         456 :     MPCContext *c = avctx->priv_data;
     199             :     GetBitContext gb;
     200             :     int i, ch;
     201         456 :     int mb = -1;
     202         456 :     Band *bands = c->bands;
     203             :     int off, ret, last_frame, skip;
     204             :     int bits_used, bits_avail;
     205             : 
     206         456 :     memset(bands, 0, sizeof(*bands) * (c->maxbands + 1));
     207             : 
     208         456 :     buf_size = avpkt->size & ~3;
     209         456 :     if (buf_size <= 0) {
     210           0 :         av_log(avctx, AV_LOG_ERROR, "packet size is too small (%i bytes)\n",
     211             :                avpkt->size);
     212           0 :         return AVERROR_INVALIDDATA;
     213             :     }
     214         456 :     if (buf_size != avpkt->size) {
     215           0 :         av_log(avctx, AV_LOG_WARNING, "packet size is not a multiple of 4. "
     216             :                "extra bytes at the end will be skipped.\n");
     217             :     }
     218             : 
     219         456 :     skip       = buf[0];
     220         456 :     last_frame = buf[1];
     221         456 :     buf       += 4;
     222         456 :     buf_size  -= 4;
     223             : 
     224             :     /* get output buffer */
     225         456 :     frame->nb_samples = MPC_FRAME_SIZE;
     226         456 :     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
     227           0 :         return ret;
     228             : 
     229         456 :     av_fast_padded_malloc(&c->bits, &c->buf_size, buf_size);
     230         456 :     if (!c->bits)
     231           0 :         return AVERROR(ENOMEM);
     232         456 :     c->bdsp.bswap_buf((uint32_t *) c->bits, (const uint32_t *) buf,
     233             :                       buf_size >> 2);
     234         456 :     if ((ret = init_get_bits8(&gb, c->bits, buf_size)) < 0)
     235           0 :         return ret;
     236         456 :     skip_bits_long(&gb, skip);
     237             : 
     238             :     /* read subband indexes */
     239       13680 :     for(i = 0; i <= c->maxbands; i++){
     240       39672 :         for(ch = 0; ch < 2; ch++){
     241       26448 :             int t = 4;
     242       26448 :             if(i) t = get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) - 5;
     243       26448 :             if(t == 4) bands[i].res[ch] = get_bits(&gb, 4);
     244       25465 :             else bands[i].res[ch] = bands[i-1].res[ch] + t;
     245       26448 :             if (bands[i].res[ch] < -1 || bands[i].res[ch] > 17) {
     246           0 :                 av_log(avctx, AV_LOG_ERROR, "subband index invalid\n");
     247           0 :                 return AVERROR_INVALIDDATA;
     248             :             }
     249             :         }
     250             : 
     251       13224 :         if(bands[i].res[0] || bands[i].res[1]){
     252       10414 :             mb = i;
     253       10414 :             if(c->MSS) bands[i].msf = get_bits1(&gb);
     254             :         }
     255             :     }
     256             :     /* get scale indexes coding method */
     257       10870 :     for(i = 0; i <= mb; i++)
     258       31242 :         for(ch = 0; ch < 2; ch++)
     259       20828 :             if(bands[i].res[ch]) bands[i].scfi[ch] = get_vlc2(&gb, scfi_vlc.table, MPC7_SCFI_BITS, 1);
     260             :     /* get scale indexes */
     261       10870 :     for(i = 0; i <= mb; i++){
     262       31242 :         for(ch = 0; ch < 2; ch++){
     263       20828 :             if(bands[i].res[ch]){
     264       18282 :                 bands[i].scf_idx[ch][2] = c->oldDSCF[ch][i];
     265       18282 :                 bands[i].scf_idx[ch][0] = get_scale_idx(&gb, bands[i].scf_idx[ch][2]);
     266       18282 :                 switch(bands[i].scfi[ch]){
     267        1558 :                 case 0:
     268        1558 :                     bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
     269        1558 :                     bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
     270        1558 :                     break;
     271        2381 :                 case 1:
     272        2381 :                     bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
     273        2381 :                     bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1];
     274        2381 :                     break;
     275        7561 :                 case 2:
     276        7561 :                     bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
     277        7561 :                     bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
     278        7561 :                     break;
     279        6782 :                 case 3:
     280        6782 :                     bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
     281        6782 :                     break;
     282             :                 }
     283       18282 :                 c->oldDSCF[ch][i] = bands[i].scf_idx[ch][2];
     284             :             }
     285             :         }
     286             :     }
     287             :     /* get quantizers */
     288         456 :     memset(c->Q, 0, sizeof(c->Q));
     289         456 :     off = 0;
     290       15048 :     for(i = 0; i < BANDS; i++, off += SAMPLES_PER_BAND)
     291       43776 :         for(ch = 0; ch < 2; ch++)
     292       29184 :             idx_to_quant(c, &gb, bands[i].res[ch], c->Q[ch] + off);
     293             : 
     294         456 :     ff_mpc_dequantize_and_synth(c, mb, (int16_t **)frame->extended_data, 2);
     295         456 :     if(last_frame)
     296           0 :         frame->nb_samples = c->lastframelen;
     297             : 
     298         456 :     bits_used = get_bits_count(&gb);
     299         456 :     bits_avail = buf_size * 8;
     300         456 :     if (!last_frame && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))) {
     301           0 :         av_log(avctx, AV_LOG_ERROR, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail);
     302           0 :         return AVERROR_INVALIDDATA;
     303             :     }
     304         456 :     if(c->frames_to_skip){
     305           0 :         c->frames_to_skip--;
     306           0 :         *got_frame_ptr = 0;
     307           0 :         return avpkt->size;
     308             :     }
     309             : 
     310         456 :     *got_frame_ptr = 1;
     311             : 
     312         456 :     return avpkt->size;
     313             : }
     314             : 
     315           0 : static void mpc7_decode_flush(AVCodecContext *avctx)
     316             : {
     317           0 :     MPCContext *c = avctx->priv_data;
     318             : 
     319           0 :     memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
     320           0 :     c->frames_to_skip = 32;
     321           0 : }
     322             : 
     323           3 : static av_cold int mpc7_decode_close(AVCodecContext *avctx)
     324             : {
     325           3 :     MPCContext *c = avctx->priv_data;
     326           3 :     av_freep(&c->bits);
     327           3 :     c->buf_size = 0;
     328           3 :     return 0;
     329             : }
     330             : 
     331             : AVCodec ff_mpc7_decoder = {
     332             :     .name           = "mpc7",
     333             :     .long_name      = NULL_IF_CONFIG_SMALL("Musepack SV7"),
     334             :     .type           = AVMEDIA_TYPE_AUDIO,
     335             :     .id             = AV_CODEC_ID_MUSEPACK7,
     336             :     .priv_data_size = sizeof(MPCContext),
     337             :     .init           = mpc7_decode_init,
     338             :     .close          = mpc7_decode_close,
     339             :     .decode         = mpc7_decode_frame,
     340             :     .flush          = mpc7_decode_flush,
     341             :     .capabilities   = AV_CODEC_CAP_DR1,
     342             :     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
     343             :                                                       AV_SAMPLE_FMT_NONE },
     344             : };

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