FFmpeg: libavcodec/opus_parser.c Source File

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libavcodec

opus_parser.c

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1 /*

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 */

21 /**

22 * @file

23 * Opus parser

24 *

25 * Determines the duration for each packet.

26 */

28 #include "avcodec.h"

29 #include "opus.h"

31 typedef struct OpusParseContext {

32 OpusContext ctx;

33 OpusPacket pkt;

34 int extradata_parsed;

35 } OpusParseContext;

37 static int opus_parse(AVCodecParserContext *ctx, AVCodecContext *avctx,

38 const uint8_t **poutbuf, int *poutbuf_size,

39 const uint8_t *buf, int buf_size)

40 {

41 OpusParseContext *s = ctx->priv_data;

42 int ret;

44 if (!buf_size)

45 return 0;

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 }

53 av_freep(&s->ctx.channel_maps);

54 s->extradata_parsed = 1;

55 }

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 }

63 ctx->duration = s->pkt.frame_count * s->pkt.frame_duration;

65 fail:

66 *poutbuf = buf;

67 *poutbuf_size = buf_size;

68 return buf_size;

69 }

71 AVCodecParser ff_opus_parser = {

72 .codec_ids = { AV_CODEC_ID_OPUS },

73 .priv_data_size = sizeof(OpusParseContext),

74 .parser_parse = opus_parse,

75 };

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