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The WAVE demuxer returns packets with many blocks per frame, which needs to be parsed into single blocks. This has a side-effect of fixing the timestamps.
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/* | ||
* GSM common header | ||
* | ||
* This file is part of Libav. | ||
* | ||
* Libav is free software; you can redistribute it and/or | ||
* modify it under the terms of the GNU Lesser General Public | ||
* License as published by the Free Software Foundation; either | ||
* version 2.1 of the License, or (at your option) any later version. | ||
* | ||
* Libav is distributed in the hope that it will be useful, | ||
* but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
* Lesser General Public License for more details. | ||
* | ||
* You should have received a copy of the GNU Lesser General Public | ||
* License along with Libav; if not, write to the Free Software | ||
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
*/ | ||
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#ifndef AVCODEC_GSM_H | ||
#define AVCODEC_GSM_H | ||
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/* bytes per block */ | ||
#define GSM_BLOCK_SIZE 33 | ||
#define GSM_MS_BLOCK_SIZE 65 | ||
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/* samples per block */ | ||
#define GSM_FRAME_SIZE 160 | ||
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#endif /* AVCODEC_GSM_H */ |
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/* | ||
* Copyright (c) 2012 Justin Ruggles | ||
* | ||
* This file is part of Libav. | ||
* | ||
* Libav is free software; you can redistribute it and/or | ||
* modify it under the terms of the GNU Lesser General Public | ||
* License as published by the Free Software Foundation; either | ||
* version 2.1 of the License, or (at your option) any later version. | ||
* | ||
* Libav is distributed in the hope that it will be useful, | ||
* but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
* Lesser General Public License for more details. | ||
* | ||
* You should have received a copy of the GNU Lesser General Public | ||
* License along with Libav; if not, write to the Free Software | ||
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
*/ | ||
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/** | ||
* @file | ||
* GSM audio parser | ||
* | ||
* Splits packets into individual blocks. | ||
*/ | ||
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#include "parser.h" | ||
#include "gsm.h" | ||
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typedef struct GSMParseContext { | ||
ParseContext pc; | ||
int block_size; | ||
int remaining; | ||
} GSMParseContext; | ||
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static int gsm_parse(AVCodecParserContext *s1, AVCodecContext *avctx, | ||
const uint8_t **poutbuf, int *poutbuf_size, | ||
const uint8_t *buf, int buf_size) | ||
{ | ||
GSMParseContext *s = s1->priv_data; | ||
ParseContext *pc = &s->pc; | ||
int next; | ||
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if (!s->block_size) { | ||
switch (avctx->codec_id) { | ||
case CODEC_ID_GSM: s->block_size = GSM_BLOCK_SIZE; break; | ||
case CODEC_ID_GSM_MS: s->block_size = GSM_MS_BLOCK_SIZE; break; | ||
default: | ||
return AVERROR(EINVAL); | ||
} | ||
} | ||
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if (!s->remaining) | ||
s->remaining = s->block_size; | ||
if (s->remaining <= buf_size) { | ||
next = s->remaining; | ||
s->remaining = 0; | ||
} else { | ||
next = END_NOT_FOUND; | ||
s->remaining -= buf_size; | ||
} | ||
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if (ff_combine_frame(pc, next, &buf, &buf_size) < 0 || !buf_size) { | ||
*poutbuf = NULL; | ||
*poutbuf_size = 0; | ||
return buf_size; | ||
} | ||
*poutbuf = buf; | ||
*poutbuf_size = buf_size; | ||
return next; | ||
} | ||
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AVCodecParser ff_gsm_parser = { | ||
.codec_ids = { CODEC_ID_GSM, CODEC_ID_GSM_MS }, | ||
.priv_data_size = sizeof(GSMParseContext), | ||
.parser_parse = gsm_parse, | ||
.parser_close = ff_parse_close, | ||
}; |
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