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opus_parser.c
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1 /*
2  * Copyright (c) 2013-2014 Mozilla Corporation
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  * Opus parser
24  *
25  * Determines the duration for each packet.
26  */
27 
28 #include "avcodec.h"
29 #include "opus.h"
30 
31 typedef struct OpusParseContext {
36 
38  const uint8_t **poutbuf, int *poutbuf_size,
39  const uint8_t *buf, int buf_size)
40 {
42  int ret;
43 
44  if (!buf_size)
45  return 0;
46 
47  if (avctx->extradata && !s->extradata_parsed) {
48  ret = ff_opus_parse_extradata(avctx, &s->ctx);
49  if (ret < 0) {
50  av_log(avctx, AV_LOG_ERROR, "Error parsing Ogg extradata.\n");
51  goto fail;
52  }
54  s->extradata_parsed = 1;
55  }
56 
57  ret = ff_opus_parse_packet(&s->pkt, buf, buf_size, s->ctx.nb_streams > 1);
58  if (ret < 0) {
59  av_log(avctx, AV_LOG_ERROR, "Error parsing Opus packet header.\n");
60  goto fail;
61  }
62 
63  ctx->duration = s->pkt.frame_count * s->pkt.frame_duration;
64 
65 fail:
66  *poutbuf = buf;
67  *poutbuf_size = buf_size;
68  return buf_size;
69 }
70 
73  .priv_data_size = sizeof(OpusParseContext),
74  .parser_parse = opus_parse,
75 };