FFmpeg
xma_parser.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 /**
20  * @file
21  * XMA2 audio parser
22  */
23 
24 #include "parser.h"
25 
26 typedef struct XMAParserContext{
29 
31  const uint8_t **poutbuf, int *poutbuf_size,
32  const uint8_t *buf, int buf_size)
33 {
34  XMAParserContext *s = s1->priv_data;
35 
36  if (buf_size % 2048 == 0) {
37  int duration = 0, packet, nb_packets = buf_size / 2048;
38 
39  for (packet = 0; packet < nb_packets; packet++) {
40  if (s->skip_packets == 0) {
41  duration += buf[packet * 2048] * 128;
42  s->skip_packets = buf[packet * 2048 + 3] + 1;
43  }
44  s->skip_packets--;
45  }
46 
47  s1->duration = duration;
48  s1->key_frame = !!duration;
49  }
50 
51  /* always return the full packet. this parser isn't doing any splitting or
52  combining, only packet analysis */
53  *poutbuf = buf;
54  *poutbuf_size = buf_size;
55  return buf_size;
56 }
57 
60  .priv_data_size = sizeof(XMAParserContext),
61  .parser_parse = xma_parse,
62 };
duration
int64_t duration
Definition: movenc.c:64
s
#define s(width, name)
Definition: cbs_vp9.c:257
s1
#define s1
Definition: regdef.h:38
xma_parse
static int xma_parse(AVCodecParserContext *s1, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size)
Definition: xma_parser.c:30
XMAParserContext::skip_packets
int skip_packets
Definition: xma_parser.c:27
AVCodecParser::codec_ids
int codec_ids[5]
Definition: avcodec.h:2922
XMAParserContext
Definition: xma_parser.c:26
parser.h
AVCodecParserContext
Definition: avcodec.h:2762
AVCodecContext
main external API structure.
Definition: avcodec.h:384
ff_xma_parser
const AVCodecParser ff_xma_parser
Definition: xma_parser.c:58
AV_CODEC_ID_XMA2
@ AV_CODEC_ID_XMA2
Definition: codec_id.h:502
AVCodecParser
Definition: avcodec.h:2921