+/**
+ *
+ * @return <0 if error
+ */
+static int asf_read_frame_header(AVFormatContext *s){
+ ASFContext *asf = s->priv_data;
+ ByteIOContext *pb = &s->pb;
+ int rsize = 1;
+ int num = get_byte(pb);
+
+ asf->packet_segments--;
+ asf->packet_key_frame = num >> 7;
+ asf->stream_index = asf->asfid2avid[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);
+ DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
+//printf("key:%d stream:%d seq:%d offset:%d replic_size:%d\n", asf->packet_key_frame, asf->stream_index, asf->packet_seq, //asf->packet_frag_offset, asf->packet_replic_size);
+ if (asf->packet_replic_size >= 8) {
+ asf->packet_obj_size = get_le32(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 -1;
+ }
+ asf->packet_frag_timestamp = get_le32(pb); // timestamp
+ url_fskip(pb, asf->packet_replic_size - 8);
+ rsize += asf->packet_replic_size; // FIXME - check validity
+ } else if (asf->packet_replic_size==1){
+ // multipacket - frag_offset is begining timestamp
+ asf->packet_time_start = asf->packet_frag_offset;
+ asf->packet_frag_offset = 0;
+ asf->packet_frag_timestamp = asf->packet_timestamp;
+
+ asf->packet_time_delta = get_byte(pb);
+ rsize++;
+ }else if(asf->packet_replic_size!=0){
+ av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
+ return -1;
+ }
+ if (asf->packet_flags & 0x01) {
+ DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
+ //printf("Fragsize %d\n", asf->packet_frag_size);
+ } else {
+ asf->packet_frag_size = asf->packet_size_left - rsize;
+ //printf("Using rest %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
+ }
+ if (asf->packet_replic_size == 1) {
+ asf->packet_multi_size = asf->packet_frag_size;
+ if (asf->packet_multi_size > asf->packet_size_left)
+ return -1;
+ }
+ asf->packet_size_left -= rsize;
+ //printf("___objsize____ %d %d rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
+
+ return 0;
+}
+