LCOV - code coverage report
Current view: top level - libavcodec - dca_parser.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 138 182 75.8 %
Date: 2017-12-12 11:08:38 Functions: 4 4 100.0 %

          Line data    Source code
       1             : /*
       2             :  * DCA parser
       3             :  * Copyright (C) 2004 Gildas Bazin
       4             :  * Copyright (C) 2004 Benjamin Zores
       5             :  * Copyright (C) 2006 Benjamin Larsson
       6             :  * Copyright (C) 2007 Konstantin Shishkov
       7             :  *
       8             :  * This file is part of FFmpeg.
       9             :  *
      10             :  * FFmpeg is free software; you can redistribute it and/or
      11             :  * modify it under the terms of the GNU Lesser General Public
      12             :  * License as published by the Free Software Foundation; either
      13             :  * version 2.1 of the License, or (at your option) any later version.
      14             :  *
      15             :  * FFmpeg is distributed in the hope that it will be useful,
      16             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      17             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      18             :  * Lesser General Public License for more details.
      19             :  *
      20             :  * You should have received a copy of the GNU Lesser General Public
      21             :  * License along with FFmpeg; if not, write to the Free Software
      22             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      23             :  */
      24             : 
      25             : #include "dca.h"
      26             : #include "dca_core.h"
      27             : #include "dca_exss.h"
      28             : #include "dca_lbr.h"
      29             : #include "dca_syncwords.h"
      30             : #include "get_bits.h"
      31             : #include "parser.h"
      32             : 
      33             : typedef struct DCAParseContext {
      34             :     ParseContext pc;
      35             :     uint32_t lastmarker;
      36             :     int size;
      37             :     int framesize;
      38             :     unsigned int startpos;
      39             :     DCAExssParser exss;
      40             :     unsigned int sr_code;
      41             : } DCAParseContext;
      42             : 
      43             : #define IS_CORE_MARKER(state) \
      44             :     (((state & 0xFFFFFFFFF0FF) == (((uint64_t)DCA_SYNCWORD_CORE_14B_LE << 16) | 0xF007)) || \
      45             :      ((state & 0xFFFFFFFFFFF0) == (((uint64_t)DCA_SYNCWORD_CORE_14B_BE << 16) | 0x07F0)) || \
      46             :      ((state & 0xFFFFFFFF00FC) == (((uint64_t)DCA_SYNCWORD_CORE_LE     << 16) | 0x00FC)) || \
      47             :      ((state & 0xFFFFFFFFFC00) == (((uint64_t)DCA_SYNCWORD_CORE_BE     << 16) | 0xFC00)))
      48             : 
      49             : #define IS_EXSS_MARKER(state)   ((state & 0xFFFFFFFF) == DCA_SYNCWORD_SUBSTREAM)
      50             : 
      51             : #define IS_MARKER(state)        (IS_CORE_MARKER(state) || IS_EXSS_MARKER(state))
      52             : 
      53             : #define CORE_MARKER(state)      ((state >> 16) & 0xFFFFFFFF)
      54             : #define EXSS_MARKER(state)      (state & 0xFFFFFFFF)
      55             : 
      56             : #define STATE_LE(state)     (((state & 0xFF00FF00) >> 8) | ((state & 0x00FF00FF) << 8))
      57             : #define STATE_14(state)     (((state & 0x3FFF0000) >> 8) | ((state & 0x00003FFF) >> 6))
      58             : 
      59             : #define CORE_FRAMESIZE(state)   (((state >> 4) & 0x3FFF) + 1)
      60             : #define EXSS_FRAMESIZE(state)   ((state & 0x2000000000) ? \
      61             :                                  ((state >>  5) & 0xFFFFF) + 1 : \
      62             :                                  ((state >> 13) & 0x0FFFF) + 1)
      63             : 
      64             : /**
      65             :  * Find the end of the current frame in the bitstream.
      66             :  * @return the position of the first byte of the next frame, or -1
      67             :  */
      68       12228 : static int dca_find_frame_end(DCAParseContext *pc1, const uint8_t *buf,
      69             :                               int buf_size)
      70             : {
      71             :     int start_found, size, i;
      72             :     uint64_t state;
      73       12228 :     ParseContext *pc = &pc1->pc;
      74             : 
      75       12228 :     start_found = pc->frame_start_found;
      76       12228 :     state       = pc->state64;
      77       12228 :     size        = pc1->size;
      78             : 
      79       12228 :     i = 0;
      80       12228 :     if (!start_found) {
      81       16050 :         for (; i < buf_size; i++) {
      82       16050 :             size++;
      83       16050 :             state = (state << 8) | buf[i];
      84             : 
      85       18732 :             if (IS_MARKER(state) &&
      86        5318 :                 (!pc1->lastmarker ||
      87        2642 :                   pc1->lastmarker == CORE_MARKER(state) ||
      88           6 :                   pc1->lastmarker == DCA_SYNCWORD_SUBSTREAM)) {
      89        2682 :                 if (!pc1->lastmarker)
      90          46 :                     pc1->startpos = IS_EXSS_MARKER(state) ? size - 4 : size - 6;
      91             : 
      92        2682 :                 if (IS_EXSS_MARKER(state))
      93           9 :                     pc1->lastmarker = EXSS_MARKER(state);
      94             :                 else
      95        2673 :                     pc1->lastmarker = CORE_MARKER(state);
      96             : 
      97        2682 :                 start_found = 1;
      98        2682 :                 size        = 0;
      99             : 
     100        2682 :                 i++;
     101        2682 :                 break;
     102             :             }
     103             :         }
     104             :     }
     105             : 
     106       12228 :     if (start_found) {
     107     9968122 :         for (; i < buf_size; i++) {
     108     9958530 :             size++;
     109     9958530 :             state = (state << 8) | buf[i];
     110             : 
     111     9958530 :             if (start_found == 1) {
     112        5400 :                 switch (pc1->lastmarker) {
     113        5346 :                 case DCA_SYNCWORD_CORE_BE:
     114        5346 :                     if (size == 2) {
     115        2673 :                         pc1->framesize = CORE_FRAMESIZE(state);
     116        2673 :                         start_found    = 2;
     117             :                     }
     118        5346 :                     break;
     119           0 :                 case DCA_SYNCWORD_CORE_LE:
     120           0 :                     if (size == 2) {
     121           0 :                         pc1->framesize = CORE_FRAMESIZE(STATE_LE(state));
     122           0 :                         start_found    = 4;
     123             :                     }
     124           0 :                     break;
     125           0 :                 case DCA_SYNCWORD_CORE_14B_BE:
     126           0 :                     if (size == 4) {
     127           0 :                         pc1->framesize = CORE_FRAMESIZE(STATE_14(state));
     128           0 :                         start_found    = 4;
     129             :                     }
     130           0 :                     break;
     131           0 :                 case DCA_SYNCWORD_CORE_14B_LE:
     132           0 :                     if (size == 4) {
     133           0 :                         pc1->framesize = CORE_FRAMESIZE(STATE_14(STATE_LE(state)));
     134           0 :                         start_found    = 4;
     135             :                     }
     136           0 :                     break;
     137          54 :                 case DCA_SYNCWORD_SUBSTREAM:
     138          54 :                     if (size == 6) {
     139           9 :                         pc1->framesize = EXSS_FRAMESIZE(state);
     140           9 :                         start_found    = 4;
     141             :                     }
     142          54 :                     break;
     143           0 :                 default:
     144           0 :                     av_assert0(0);
     145             :                 }
     146        5400 :                 continue;
     147             :             }
     148             : 
     149     9954494 :             if (start_found == 2 && IS_EXSS_MARKER(state) &&
     150        1364 :                 pc1->framesize <= size + 2) {
     151        1364 :                 pc1->framesize  = size + 2;
     152        1364 :                 start_found     = 3;
     153        1364 :                 continue;
     154             :             }
     155             : 
     156     9951766 :             if (start_found == 3) {
     157        8184 :                 if (size == pc1->framesize + 4) {
     158        1364 :                     pc1->framesize += EXSS_FRAMESIZE(state);
     159        1364 :                     start_found     = 4;
     160             :                 }
     161        8184 :                 continue;
     162             :             }
     163             : 
     164     9943582 :             if (pc1->framesize > size)
     165     9940946 :                 continue;
     166             : 
     167        5272 :             if (IS_MARKER(state) &&
     168        2642 :                 (pc1->lastmarker == CORE_MARKER(state) ||
     169           6 :                  pc1->lastmarker == DCA_SYNCWORD_SUBSTREAM)) {
     170        2636 :                 pc->frame_start_found = 0;
     171        2636 :                 pc->state64           = -1;
     172        2636 :                 pc1->size             = 0;
     173        2636 :                 return IS_EXSS_MARKER(state) ? i - 3 : i - 5;
     174             :             }
     175             :         }
     176             :     }
     177             : 
     178        9592 :     pc->frame_start_found = start_found;
     179        9592 :     pc->state64           = state;
     180        9592 :     pc1->size             = size;
     181        9592 :     return END_NOT_FOUND;
     182             : }
     183             : 
     184          48 : static av_cold int dca_parse_init(AVCodecParserContext *s)
     185             : {
     186          48 :     DCAParseContext *pc1 = s->priv_data;
     187             : 
     188          48 :     pc1->lastmarker = 0;
     189          48 :     pc1->sr_code = -1;
     190          48 :     return 0;
     191             : }
     192             : 
     193        3367 : static int dca_parse_params(DCAParseContext *pc1, const uint8_t *buf,
     194             :                             int buf_size, int *duration, int *sample_rate,
     195             :                             int *profile)
     196             : {
     197        3367 :     DCAExssAsset *asset = &pc1->exss.assets[0];
     198             :     GetBitContext gb;
     199             :     DCACoreFrameHeader h;
     200        3367 :     uint8_t hdr[DCA_CORE_FRAME_HEADER_SIZE + AV_INPUT_BUFFER_PADDING_SIZE] = { 0 };
     201             :     int ret, frame_size;
     202             : 
     203        3367 :     if (buf_size < DCA_CORE_FRAME_HEADER_SIZE)
     204          47 :         return AVERROR_INVALIDDATA;
     205             : 
     206        3320 :     if (AV_RB32(buf) == DCA_SYNCWORD_SUBSTREAM) {
     207           9 :         if ((ret = ff_dca_exss_parse(&pc1->exss, buf, buf_size)) < 0)
     208           0 :             return ret;
     209             : 
     210           9 :         if (asset->extension_mask & DCA_EXSS_LBR) {
     211           0 :             if ((ret = init_get_bits8(&gb, buf + asset->lbr_offset, asset->lbr_size)) < 0)
     212           0 :                 return ret;
     213             : 
     214           0 :             if (get_bits_long(&gb, 32) != DCA_SYNCWORD_LBR)
     215           0 :                 return AVERROR_INVALIDDATA;
     216             : 
     217           0 :             switch (get_bits(&gb, 8)) {
     218           0 :             case DCA_LBR_HEADER_DECODER_INIT:
     219           0 :                 pc1->sr_code = get_bits(&gb, 8);
     220           0 :             case DCA_LBR_HEADER_SYNC_ONLY:
     221           0 :                 break;
     222           0 :             default:
     223           0 :                 return AVERROR_INVALIDDATA;
     224             :             }
     225             : 
     226           0 :             if (pc1->sr_code >= FF_ARRAY_ELEMS(ff_dca_sampling_freqs))
     227           0 :                 return AVERROR_INVALIDDATA;
     228             : 
     229           0 :             *sample_rate = ff_dca_sampling_freqs[pc1->sr_code];
     230           0 :             *duration = 1024 << ff_dca_freq_ranges[pc1->sr_code];
     231           0 :             *profile = FF_PROFILE_DTS_EXPRESS;
     232           0 :             return 0;
     233             :         }
     234             : 
     235           9 :         if (asset->extension_mask & DCA_EXSS_XLL) {
     236             :             int nsamples_log2;
     237             : 
     238           9 :             if ((ret = init_get_bits8(&gb, buf + asset->xll_offset, asset->xll_size)) < 0)
     239           0 :                 return ret;
     240             : 
     241           9 :             if (get_bits_long(&gb, 32) != DCA_SYNCWORD_XLL)
     242           0 :                 return AVERROR_INVALIDDATA;
     243             : 
     244           9 :             if (get_bits(&gb, 4))
     245           0 :                 return AVERROR_INVALIDDATA;
     246             : 
     247           9 :             skip_bits(&gb, 8);
     248           9 :             skip_bits_long(&gb, get_bits(&gb, 5) + 1);
     249           9 :             skip_bits(&gb, 4);
     250           9 :             nsamples_log2 = get_bits(&gb, 4) + get_bits(&gb, 4);
     251           9 :             if (nsamples_log2 > 24)
     252           0 :                 return AVERROR_INVALIDDATA;
     253             : 
     254           9 :             *sample_rate = asset->max_sample_rate;
     255           9 :             *duration = (1 + (*sample_rate > 96000)) << nsamples_log2;
     256           9 :             *profile = FF_PROFILE_DTS_HD_MA;
     257           9 :             return 0;
     258             :         }
     259             : 
     260           0 :         return AVERROR_INVALIDDATA;
     261             :     }
     262             : 
     263        3311 :     if ((ret = avpriv_dca_convert_bitstream(buf, DCA_CORE_FRAME_HEADER_SIZE,
     264             :                                             hdr, DCA_CORE_FRAME_HEADER_SIZE)) < 0)
     265           0 :         return ret;
     266        3311 :     if (avpriv_dca_parse_core_frame_header(&h, hdr, ret) < 0)
     267           0 :         return AVERROR_INVALIDDATA;
     268             : 
     269        3311 :     *duration = h.npcmblocks * DCA_PCMBLOCK_SAMPLES;
     270        3311 :     *sample_rate = avpriv_dca_sample_rates[h.sr_code];
     271        3311 :     if (*profile != FF_PROFILE_UNKNOWN)
     272        3268 :         return 0;
     273             : 
     274          43 :     *profile = FF_PROFILE_DTS;
     275          43 :     if (h.ext_audio_present) {
     276          12 :         switch (h.ext_audio_type) {
     277           8 :         case DCA_EXT_AUDIO_XCH:
     278             :         case DCA_EXT_AUDIO_XXCH:
     279           8 :             *profile = FF_PROFILE_DTS_ES;
     280           8 :             break;
     281           4 :         case DCA_EXT_AUDIO_X96:
     282           4 :             *profile = FF_PROFILE_DTS_96_24;
     283           4 :             break;
     284             :         }
     285             :     }
     286             : 
     287          43 :     frame_size = FFALIGN(h.frame_size, 4);
     288          43 :     if (buf_size - 4 < frame_size)
     289          10 :         return 0;
     290             : 
     291          33 :     buf      += frame_size;
     292          33 :     buf_size -= frame_size;
     293          33 :     if (AV_RB32(buf) != DCA_SYNCWORD_SUBSTREAM)
     294           0 :         return 0;
     295          33 :     if (ff_dca_exss_parse(&pc1->exss, buf, buf_size) < 0)
     296           0 :         return 0;
     297             : 
     298          33 :     if (asset->extension_mask & DCA_EXSS_XLL)
     299          25 :         *profile = FF_PROFILE_DTS_HD_MA;
     300           8 :     else if (asset->extension_mask & (DCA_EXSS_XBR | DCA_EXSS_XXCH | DCA_EXSS_X96))
     301           8 :         *profile = FF_PROFILE_DTS_HD_HRA;
     302             : 
     303          33 :     return 0;
     304             : }
     305             : 
     306       12867 : static int dca_parse(AVCodecParserContext *s, AVCodecContext *avctx,
     307             :                      const uint8_t **poutbuf, int *poutbuf_size,
     308             :                      const uint8_t *buf, int buf_size)
     309             : {
     310       12867 :     DCAParseContext *pc1 = s->priv_data;
     311       12867 :     ParseContext *pc = &pc1->pc;
     312             :     int next, duration, sample_rate;
     313             : 
     314       12867 :     if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
     315         639 :         next = buf_size;
     316             :     } else {
     317       12228 :         next = dca_find_frame_end(pc1, buf, buf_size);
     318             : 
     319       12228 :         if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
     320        9500 :             *poutbuf      = NULL;
     321        9500 :             *poutbuf_size = 0;
     322        9500 :             return buf_size;
     323             :         }
     324             : 
     325             :         /* skip initial padding */
     326        2728 :         if (buf_size  > pc1->startpos) {
     327        2682 :             buf      += pc1->startpos;
     328        2682 :             buf_size -= pc1->startpos;
     329             :         }
     330        2728 :         pc1->startpos = 0;
     331             :     }
     332             : 
     333             :     /* read the duration and sample rate from the frame header */
     334        3367 :     if (!dca_parse_params(pc1, buf, buf_size, &duration, &sample_rate, &avctx->profile)) {
     335        3320 :         if (!avctx->sample_rate)
     336           4 :             avctx->sample_rate = sample_rate;
     337        3320 :         s->duration = av_rescale(duration, avctx->sample_rate, sample_rate);
     338             :     } else
     339          47 :         s->duration = 0;
     340             : 
     341        3367 :     *poutbuf      = buf;
     342        3367 :     *poutbuf_size = buf_size;
     343        3367 :     return next;
     344             : }
     345             : 
     346             : AVCodecParser ff_dca_parser = {
     347             :     .codec_ids      = { AV_CODEC_ID_DTS },
     348             :     .priv_data_size = sizeof(DCAParseContext),
     349             :     .parser_init    = dca_parse_init,
     350             :     .parser_parse   = dca_parse,
     351             :     .parser_close   = ff_parse_close,
     352             : };

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