LCOV - code coverage report
Current view: top level - libavcodec - gsm_parser.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 25 31 80.6 %
Date: 2017-12-12 11:08:38 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2012  Justin Ruggles
       3             :  *
       4             :  * This file is part of FFmpeg.
       5             :  *
       6             :  * FFmpeg is free software; you can redistribute it and/or
       7             :  * modify it under the terms of the GNU Lesser General Public
       8             :  * License as published by the Free Software Foundation; either
       9             :  * version 2.1 of the License, or (at your option) any later version.
      10             :  *
      11             :  * FFmpeg is distributed in the hope that it will be useful,
      12             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14             :  * Lesser General Public License for more details.
      15             :  *
      16             :  * You should have received a copy of the GNU Lesser General Public
      17             :  * License along with FFmpeg; if not, write to the Free Software
      18             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      19             :  */
      20             : 
      21             : /**
      22             :  * @file
      23             :  * GSM audio parser
      24             :  *
      25             :  * Splits packets into individual blocks.
      26             :  */
      27             : 
      28             : #include "libavutil/avassert.h"
      29             : #include "parser.h"
      30             : #include "gsm.h"
      31             : 
      32             : typedef struct GSMParseContext {
      33             :     ParseContext pc;
      34             :     int block_size;
      35             :     int duration;
      36             :     int remaining;
      37             : } GSMParseContext;
      38             : 
      39          90 : static int gsm_parse(AVCodecParserContext *s1, AVCodecContext *avctx,
      40             :                      const uint8_t **poutbuf, int *poutbuf_size,
      41             :                      const uint8_t *buf, int buf_size)
      42             : {
      43          90 :     GSMParseContext *s = s1->priv_data;
      44          90 :     ParseContext *pc = &s->pc;
      45             :     int next;
      46             : 
      47          90 :     if (!s->block_size) {
      48           1 :         switch (avctx->codec_id) {
      49           0 :         case AV_CODEC_ID_GSM:
      50           0 :             s->block_size = GSM_BLOCK_SIZE;
      51           0 :             s->duration   = GSM_FRAME_SIZE;
      52           0 :             break;
      53           1 :         case AV_CODEC_ID_GSM_MS:
      54           2 :             s->block_size = avctx->block_align ? avctx->block_align
      55           1 :                                                : GSM_MS_BLOCK_SIZE;
      56           1 :             s->duration   = GSM_FRAME_SIZE * 2;
      57           1 :             break;
      58           0 :         default:
      59           0 :             av_assert0(0);
      60             :         }
      61             :     }
      62             : 
      63          90 :     if (!s->remaining)
      64          90 :         s->remaining = s->block_size;
      65          90 :     if (s->remaining <= buf_size) {
      66          89 :         next = s->remaining;
      67          89 :         s->remaining = 0;
      68             :     } else {
      69           1 :         next = END_NOT_FOUND;
      70           1 :         s->remaining -= buf_size;
      71             :     }
      72             : 
      73          90 :     if (ff_combine_frame(pc, next, &buf, &buf_size) < 0 || !buf_size) {
      74           1 :         *poutbuf      = NULL;
      75           1 :         *poutbuf_size = 0;
      76           1 :         return buf_size;
      77             :     }
      78             : 
      79          89 :     s1->duration = s->duration;
      80             : 
      81          89 :     *poutbuf      = buf;
      82          89 :     *poutbuf_size = buf_size;
      83          89 :     return next;
      84             : }
      85             : 
      86             : AVCodecParser ff_gsm_parser = {
      87             :     .codec_ids      = { AV_CODEC_ID_GSM, AV_CODEC_ID_GSM_MS },
      88             :     .priv_data_size = sizeof(GSMParseContext),
      89             :     .parser_parse   = gsm_parse,
      90             :     .parser_close   = ff_parse_close,
      91             : };

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