asfdec: correctly parse payload extensions

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/asfdec.c

@@ -926,13 +926,16 @@ static int ff_asf_get_packet(AVFormatContext *s, AVIOContext *pb)
  */
 static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb){
     ASFContext *asf = s->priv_data;
+    ASFStream *asfst;
     int rsize = 1;
     int num = avio_r8(pb);
+    int i;
     int64_t ts0, ts1 av_unused;
 
     asf->packet_segments--;
     asf->packet_key_frame = num >> 7;
     asf->stream_index = asf->asfid2avid[num & 0x7f];
+    asfst = &asf->streams[num & 0x7f];
     // sequence should be ignored!
     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
@@ -945,23 +948,48 @@ static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb){
         return AVERROR_INVALIDDATA;
     }
     if (asf->packet_replic_size >= 8) {
+        int64_t end = avio_tell(pb) + asf->packet_replic_size;
         asf->packet_obj_size = avio_rl32(pb);
         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
             return AVERROR_INVALIDDATA;
         }
         asf->packet_frag_timestamp = avio_rl32(pb); // timestamp
-        if(asf->packet_replic_size >= 8+38+4){
-            avio_skip(pb, 10);
-            ts0= avio_rl64(pb);
-            ts1= avio_rl64(pb);
-            avio_skip(pb, 12);
-            avio_rl32(pb);
-            avio_skip(pb, asf->packet_replic_size - 8 - 38 - 4);
-            if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
-            else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
-        }else
-            avio_skip(pb, asf->packet_replic_size - 8);
+
+        for (i=0; i<asfst->payload_ext_ct; i++) {
+            ASFPayload *p = &asfst->payload[i];
+            int size = p->size;
+            int64_t payend;
+            if(size == 0xFFFF)
+                size = avio_rl16(pb);
+            payend = avio_tell(pb) + size;
+            if (payend > end) {
+                av_log(s, AV_LOG_ERROR, "too long payload\n");
+                break;
+            }
+            switch(p->type) {
+            case 0x50:
+//              duration = avio_rl16(pb);
+                break;
+            case 0x2A:
+                avio_skip(pb, 8);
+                ts0= avio_rl64(pb);
+                ts1= avio_rl64(pb);
+                if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
+                else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
+                break;
+            case 0x5B:
+            case 0xB7:
+            case 0xCC:
+            case 0xC0:
+            case 0xA0:
+                //unknown
+                break;
+            }
+            avio_seek(pb, payend, SEEK_SET);
+        }
+
+        avio_seek(pb, end, SEEK_SET);
         rsize += asf->packet_replic_size; // FIXME - check validity
     } else if (asf->packet_replic_size==1){
         // multipacket - frag_offset is beginning timestamp