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require a few valid and equal mp3 headers for resync 

Originally committed as revision 3900 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2005-01-29 23:59:32 +00:00
parent f4ff1b92cc
commit 4b9ac0b5f0
1 changed files with 16 additions and 3 deletions
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19
libavcodec/parser.c
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@ -494,6 +494,8 @@ typedef struct MpegAudioParseContext {
int frame_size;
int free_format_frame_size;
int free_format_next_header;
uint32_t header;
int header_count;
} MpegAudioParseContext;
#define MPA_HEADER_SIZE 4
@ -515,7 +517,7 @@ static int mpegaudio_parse(AVCodecParserContext *s1,
const uint8_t *buf, int buf_size)
{
MpegAudioParseContext *s = s1->priv_data;
int len, ret;
int len, ret, sr;
uint32_t header;
const uint8_t *buf_ptr;
@ -549,11 +551,13 @@ static int mpegaudio_parse(AVCodecParserContext *s1,
}
if ((s->inbuf_ptr - s->inbuf) >= MPA_HEADER_SIZE) {
got_header:
sr= avctx->sample_rate;
header = (s->inbuf[0] << 24) | (s->inbuf[1] << 16) |
(s->inbuf[2] << 8) | s->inbuf[3];
ret = mpa_decode_header(avctx, header);
if (ret < 0) {
s->header_count= -2;
/* no sync found : move by one byte (inefficient, but simple!) */
memmove(s->inbuf, s->inbuf + 1, s->inbuf_ptr - s->inbuf - 1);
s->inbuf_ptr--;
@ -562,7 +566,12 @@ static int mpegaudio_parse(AVCodecParserContext *s1,
to get a new bitrate */
s->free_format_frame_size = 0;
} else {
if((header&SAME_HEADER_MASK) != (s->header&SAME_HEADER_MASK) && s->header)
s->header_count= -3;
s->header= header;
s->header_count++;
s->frame_size = ret;
#if 0
/* free format: prepare to compute frame size */
if (decode_header(s, header) == 1) {
@ -570,6 +579,8 @@ static int mpegaudio_parse(AVCodecParserContext *s1,
}
#endif
}
if(s->header_count <= 0)
avctx->sample_rate= sr; //FIXME ugly
}
} else
#if 0
@ -642,8 +653,10 @@ static int mpegaudio_parse(AVCodecParserContext *s1,
// next_data:
if (s->frame_size > 0 &&
(s->inbuf_ptr - s->inbuf) >= s->frame_size) {
*poutbuf = s->inbuf;
*poutbuf_size = s->inbuf_ptr - s->inbuf;
if(s->header_count > 0){
*poutbuf = s->inbuf;
*poutbuf_size = s->inbuf_ptr - s->inbuf;
}
s->inbuf_ptr = s->inbuf;
s->frame_size = 0;
break;