[FFmpeg-cvslog] avidec: Factor out the sync fucntionality.
Alex Converse
git at videolan.org
Sat Jul 2 03:38:05 CEST 2011
ffmpeg | branch: master | Alex Converse <alex.converse at gmail.com> | Wed Jun 29 13:30:09 2011 -0700| [8b84af748865105a6520a1e486792e8a5a82e2a6] | committer: Alex Converse
avidec: Factor out the sync fucntionality.
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=8b84af748865105a6520a1e486792e8a5a82e2a6
---
libavformat/avidec.c | 244 ++++++++++++++++++++++++++------------------------
1 files changed, 128 insertions(+), 116 deletions(-)
diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index 85fc794..7e509ce 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -836,13 +836,137 @@ static int get_stream_idx(int *d){
}
}
-static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
+static int avi_sync(AVFormatContext *s)
{
AVIContext *avi = s->priv_data;
AVIOContext *pb = s->pb;
int n, d[8];
unsigned int size;
int64_t i, sync;
+
+start_sync:
+ memset(d, -1, sizeof(int)*8);
+ for(i=sync=avio_tell(pb); !pb->eof_reached; i++) {
+ int j;
+
+ for(j=0; j<7; j++)
+ d[j]= d[j+1];
+ d[7]= avio_r8(pb);
+
+ size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
+
+ n= get_stream_idx(d+2);
+//av_log(s, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %"PRId64" %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
+ if(i + (uint64_t)size > avi->fsize || 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')
+ ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
+ avio_skip(pb, size);
+//av_log(s, AV_LOG_DEBUG, "SKIP\n");
+ goto start_sync;
+ }
+
+ //parse stray LIST
+ if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
+ avio_skip(pb, 4);
+ goto start_sync;
+ }
+
+ n= get_stream_idx(d);
+
+ if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
+ continue;
+
+ //detect ##ix chunk and skip
+ if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
+ avio_skip(pb, size);
+ goto start_sync;
+ }
+
+ //parse ##dc/##wb
+ if(n < s->nb_streams){
+ AVStream *st;
+ AVIStream *ast;
+ st = s->streams[n];
+ ast = st->priv_data;
+
+ if(s->nb_streams>=2){
+ AVStream *st1 = s->streams[1];
+ AVIStream *ast1= st1->priv_data;
+ //workaround for broken small-file-bug402.avi
+ if( d[2] == 'w' && d[3] == 'b'
+ && n==0
+ && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
+ && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
+ && ast->prefix == 'd'*256+'c'
+ && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
+ ){
+ n=1;
+ st = st1;
+ ast = ast1;
+ av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
+ }
+ }
+
+
+ if( (st->discard >= AVDISCARD_DEFAULT && size==0)
+ /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
+ || st->discard >= AVDISCARD_ALL){
+ ast->frame_offset += get_duration(ast, size);
+ avio_skip(pb, size);
+ goto start_sync;
+ }
+
+ if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
+ int k = avio_r8(pb);
+ int last = (k + avio_r8(pb) - 1) & 0xFF;
+
+ avio_rl16(pb); //flags
+
+ for (; k <= last; k++)
+ ast->pal[k] = avio_rb32(pb)>>8;// b + (g << 8) + (r << 16);
+ ast->has_pal= 1;
+ goto start_sync;
+ } else if( ((ast->prefix_count<5 || sync+9 > i) && 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(s, 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;
+ }
+
+ avi->stream_index= n;
+ ast->packet_size= size + 8;
+ ast->remaining= size;
+
+ if(size || !ast->sample_size){
+ uint64_t pos= avio_tell(pb) - 8;
+ if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
+ av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
+ }
+ }
+ return 0;
+ }
+ }
+ }
+
+ return AVERROR_EOF;
+}
+
+static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ AVIContext *avi = s->priv_data;
+ AVIOContext *pb = s->pb;
+ int err;
void* dstr;
if (CONFIG_DV_DEMUXER && avi->dv_demux) {
@@ -993,121 +1117,9 @@ resync:
return size;
}
- memset(d, -1, sizeof(int)*8);
- for(i=sync=avio_tell(pb); !pb->eof_reached; i++) {
- int j;
-
- for(j=0; j<7; j++)
- d[j]= d[j+1];
- d[7]= avio_r8(pb);
-
- size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
-
- n= get_stream_idx(d+2);
-//av_log(s, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %"PRId64" %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
- if(i + (uint64_t)size > avi->fsize || 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')
- ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
- avio_skip(pb, size);
-//av_log(s, AV_LOG_DEBUG, "SKIP\n");
- goto resync;
- }
-
- //parse stray LIST
- if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
- avio_skip(pb, 4);
- goto resync;
- }
-
- n= get_stream_idx(d);
-
- if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
- continue;
-
- //detect ##ix chunk and skip
- if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
- avio_skip(pb, size);
- goto resync;
- }
-
- //parse ##dc/##wb
- if(n < s->nb_streams){
- AVStream *st;
- AVIStream *ast;
- st = s->streams[n];
- ast = st->priv_data;
-
- if(s->nb_streams>=2){
- AVStream *st1 = s->streams[1];
- AVIStream *ast1= st1->priv_data;
- //workaround for broken small-file-bug402.avi
- if( d[2] == 'w' && d[3] == 'b'
- && n==0
- && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
- && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
- && ast->prefix == 'd'*256+'c'
- && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
- ){
- n=1;
- st = st1;
- ast = ast1;
- av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
- }
- }
-
-
- if( (st->discard >= AVDISCARD_DEFAULT && size==0)
- /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
- || st->discard >= AVDISCARD_ALL){
- ast->frame_offset += get_duration(ast, size);
- avio_skip(pb, size);
- goto resync;
- }
-
- if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
- int k = avio_r8(pb);
- int last = (k + avio_r8(pb) - 1) & 0xFF;
-
- avio_rl16(pb); //flags
-
- for (; k <= last; k++)
- ast->pal[k] = avio_rb32(pb)>>8;// b + (g << 8) + (r << 16);
- ast->has_pal= 1;
- goto resync;
- } else if( ((ast->prefix_count<5 || sync+9 > i) && 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(s, 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;
- }
-
- avi->stream_index= n;
- ast->packet_size= size + 8;
- ast->remaining= size;
-
- if(size || !ast->sample_size){
- uint64_t pos= avio_tell(pb) - 8;
- if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
- av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
- }
- }
- goto resync;
- }
- }
- }
-
- return AVERROR_EOF;
+ if ((err = avi_sync(s)) < 0)
+ return err;
+ goto resync;
}
/* XXX: We make the implicit supposition that the positions are sorted
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