0,0 → 1,91 |
/* |
* Copyright (c) 2012 Justin Ruggles |
* |
* This file is part of FFmpeg. |
* |
* FFmpeg 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. |
* |
* FFmpeg 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 FFmpeg; if not, write to the Free Software |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
*/ |
|
/** |
* @file |
* GSM audio parser |
* |
* Splits packets into individual blocks. |
*/ |
|
#include "libavutil/avassert.h" |
#include "parser.h" |
#include "gsm.h" |
|
typedef struct GSMParseContext { |
ParseContext pc; |
int block_size; |
int duration; |
int remaining; |
} GSMParseContext; |
|
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; |
|
if (!s->block_size) { |
switch (avctx->codec_id) { |
case AV_CODEC_ID_GSM: |
s->block_size = GSM_BLOCK_SIZE; |
s->duration = GSM_FRAME_SIZE; |
break; |
case AV_CODEC_ID_GSM_MS: |
s->block_size = avctx->block_align ? avctx->block_align |
: GSM_MS_BLOCK_SIZE; |
s->duration = GSM_FRAME_SIZE * 2; |
break; |
default: |
av_assert0(0); |
} |
} |
|
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; |
} |
|
if (ff_combine_frame(pc, next, &buf, &buf_size) < 0 || !buf_size) { |
*poutbuf = NULL; |
*poutbuf_size = 0; |
return buf_size; |
} |
|
s1->duration = s->duration; |
|
*poutbuf = buf; |
*poutbuf_size = buf_size; |
return next; |
} |
|
AVCodecParser ff_gsm_parser = { |
.codec_ids = { AV_CODEC_ID_GSM, AV_CODEC_ID_GSM_MS }, |
.priv_data_size = sizeof(GSMParseContext), |
.parser_parse = gsm_parse, |
.parser_close = ff_parse_close, |
}; |