replic_size==0 fix, needed so that G.726 asf file, so ffmpeg can at least decode the video without segfaulting

Originally committed as revision 2706 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/asf.c

@@ -1141,22 +1141,23 @@ static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 	    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 > 1) {
+                assert(asf->packet_replic_size >= 8);
                 // it should be always at least 8 bytes - FIXME validate
 		asf->packet_obj_size = get_le32(pb);
 		asf->packet_frag_timestamp = get_le32(pb); // timestamp
 		if (asf->packet_replic_size > 8)
 		    url_fskip(pb, asf->packet_replic_size - 8);
 		rsize += asf->packet_replic_size; // FIXME - check validity
-	    } else {
+	    } 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;
 
-		if (asf->packet_replic_size == 1) {
                 asf->packet_time_delta = get_byte(pb);
 		rsize++;
-		}
+	    }else{
+                assert(asf->packet_replic_size==0);
             }
 	    if (asf->packet_flags & 0x01) {
 		DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
@@ -1233,9 +1234,9 @@ static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 	    asf_st->pkt.pts = asf->packet_frag_timestamp - asf->hdr.preroll;
 	    asf_st->pkt.stream_index = asf->stream_index;
             asf_st->packet_pos= asf->packet_pos;            
-//printf("new packet: stream:%d key:%d packet_key:%d audio:%d\n", 
+//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n", 
 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
-//s->streams[asf->stream_index]->codec.codec_type == CODEC_TYPE_AUDIO);
+//s->streams[asf->stream_index]->codec.codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
 	    if (s->streams[asf->stream_index]->codec.codec_type == CODEC_TYPE_AUDIO) 
 		asf->packet_key_frame = 1;
 	    if (asf->packet_key_frame)