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various fixes for the main chunk demux loop

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Originally committed as revision 3464 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-09-15 01:35:09 +00:00
parent b100eab869
commit d2c5f0a4bf
1 changed files with 46 additions and 27 deletions
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69
libavformat/avidec.c
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@ -42,6 +42,9 @@ typedef struct AVIStream {
int new_frame_offset; /* temporary storage (used during seek) */
int cum_len; /* temporary storage (used during seek) */
int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
int prefix_count;
} AVIStream;
typedef struct {
@ -397,34 +400,53 @@ static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
//parse ix##
n= (d[2] - '0') * 10 + (d[3] - '0');
if( d[2] >= '0' && d[2] <= '9'
&& d[3] >= '0' && d[3] <= '9'
&& d[0] == 'i' && d[1] == 'x'
&& n < s->nb_streams
&& i + size <= avi->movi_end){
&& d[3] >= '0' && d[3] <= '9'){
n= (d[2] - '0') * 10 + (d[3] - '0');
}else{
n= 100; //invalid stream id
}
//av_log(NULL, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %lld %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
if(i + size > avi->movi_end || d[0]<0)
continue;
//parse ix##
if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
//parse JUNK
||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')){
url_fskip(pb, size);
i+= size;
memset(d, -1, sizeof(int)*8);
//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
continue;
}
//parse JUNK
if(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K' &&
i + size <= avi->movi_end) {
url_fskip(pb, size);
if( d[0] >= '0' && d[0] <= '9'
&& d[1] >= '0' && d[1] <= '9'){
n= (d[0] - '0') * 10 + (d[1] - '0');
}else{
n= 100; //invalid stream id
}
//parse ##dc/##wb
n= (d[0] - '0') * 10 + (d[1] - '0');
if( d[0] >= '0' && d[0] <= '9'
&& d[1] >= '0' && d[1] <= '9'
&& ((d[2] == 'd' && d[3] == 'c') ||
(d[2] == 'w' && d[3] == 'b') ||
(d[2] == 'd' && d[3] == 'b') ||
(d[2] == '_' && d[3] == '_'))
&& n < s->nb_streams
&& i + size <= avi->movi_end) {
if(n < s->nb_streams){
AVStream *st;
AVIStream *ast;
st = s->streams[n];
ast = st->priv_data;
if( (ast->prefix_count<5 && d[2]<128 && d[3]<128) ||
d[2]*256+d[3] == ast->prefix /*||
(d[2] == 'd' && d[3] == 'c') ||
(d[2] == 'w' && d[3] == 'b')*/) {
//av_log(NULL, AV_LOG_DEBUG, "OK\n");
if(d[2]*256+d[3] == ast->prefix)
ast->prefix_count++;
else{
ast->prefix= d[2]*256+d[3];
ast->prefix_count= 0;
}
av_new_packet(pkt, size);
get_buffer(pb, pkt->data, size);
@ -440,11 +462,6 @@ static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
pkt->destruct = dstr;
pkt->flags |= PKT_FLAG_KEY;
} else {
AVStream *st;
AVIStream *ast;
st = s->streams[n];
ast = st->priv_data;
/* XXX: how to handle B frames in avi ? */
pkt->dts = ast->frame_offset;
// pkt->dts += ast->start;
@ -471,8 +488,10 @@ static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
ast->frame_offset++;
}
return size;
}
}
}
return -1;
}