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libavcodec
gsm_parser.c
Go to the documentation of this file.
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/*
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* Copyright (c) 2012 Justin Ruggles
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "
parser.h
"
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#include "
gsm.h
"
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typedef
struct
GSMParseContext
{
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ParseContext
pc
;
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int
block_size
;
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int
duration
;
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int
remaining
;
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}
GSMParseContext
;
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static
int
gsm_parse
(
AVCodecParserContext
*
s1
,
AVCodecContext
*avctx,
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const
uint8_t
**poutbuf,
int
*poutbuf_size,
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const
uint8_t
*buf,
int
buf_size)
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{
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GSMParseContext
*s = s1->
priv_data
;
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ParseContext
*pc = &s->
pc
;
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int
next;
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if
(!s->
block_size
) {
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switch
(avctx->
codec_id
) {
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case
AV_CODEC_ID_GSM
:
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s->
block_size
=
GSM_BLOCK_SIZE
;
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s->
duration
=
GSM_FRAME_SIZE
;
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break
;
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case
AV_CODEC_ID_GSM_MS
:
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s->
block_size
=
GSM_MS_BLOCK_SIZE
;
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s->
duration
=
GSM_FRAME_SIZE
* 2;
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break
;
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default
:
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return
AVERROR
(EINVAL);
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}
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}
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if
(!s->
remaining
)
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s->
remaining
= s->
block_size
;
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if
(s->
remaining
<= buf_size) {
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next = s->
remaining
;
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s->
remaining
= 0;
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}
else
{
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next =
END_NOT_FOUND
;
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s->
remaining
-= buf_size;
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}
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if
(
ff_combine_frame
(pc, next, &buf, &buf_size) < 0 || !buf_size) {
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*poutbuf =
NULL
;
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*poutbuf_size = 0;
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return
buf_size;
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}
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s1->
duration
= s->
duration
;
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*poutbuf = buf;
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*poutbuf_size = buf_size;
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return
next;
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}
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AVCodecParser
ff_gsm_parser
= {
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.
codec_ids
= {
AV_CODEC_ID_GSM
,
AV_CODEC_ID_GSM_MS
},
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.priv_data_size =
sizeof
(
GSMParseContext
),
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.parser_parse =
gsm_parse
,
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.parser_close =
ff_parse_close
,
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};