-static int asf_header_parser(MMSContext *mms)
-{
- uint8_t *p = mms->asf_header;
- uint8_t *end;
- int flags, stream_id;
- mms->stream_num = 0;
-
- if (mms->asf_header_size < sizeof(ff_asf_guid) * 2 + 22 ||
- memcmp(p, ff_asf_header, sizeof(ff_asf_guid))) {
- av_log(NULL, AV_LOG_ERROR,
- "Corrupt stream (invalid ASF header, size=%d)\n",
- mms->asf_header_size);
- return AVERROR_INVALIDDATA;
- }
-
- end = mms->asf_header + mms->asf_header_size;
-
- p += sizeof(ff_asf_guid) + 14;
- while(end - p >= sizeof(ff_asf_guid) + 8) {
- uint64_t chunksize = AV_RL64(p + sizeof(ff_asf_guid));
- if (!chunksize || chunksize > end - p) {
- av_log(NULL, AV_LOG_ERROR,
- "Corrupt stream (header chunksize %"PRId64" is invalid)\n",
- chunksize);
- return AVERROR_INVALIDDATA;
- }
- if (!memcmp(p, ff_asf_file_header, sizeof(ff_asf_guid))) {
- /* read packet size */
- if (end - p > sizeof(ff_asf_guid) * 2 + 68) {
- mms->asf_packet_len = AV_RL32(p + sizeof(ff_asf_guid) * 2 + 64);
- if (mms->asf_packet_len <= 0 || mms->asf_packet_len > sizeof(mms->in_buffer)) {
- av_log(NULL, AV_LOG_ERROR,
- "Corrupt stream (too large pkt_len %d)\n",
- mms->asf_packet_len);
- return AVERROR_INVALIDDATA;
- }
- }
- } else if (!memcmp(p, ff_asf_stream_header, sizeof(ff_asf_guid))) {
- flags = AV_RL16(p + sizeof(ff_asf_guid)*3 + 24);
- stream_id = flags & 0x7F;
- //The second condition is for checking CS_PKT_STREAM_ID_REQUEST packet size,
- //we can calcuate the packet size by stream_num.
- //Please see function send_stream_selection_request().
- if (mms->stream_num < MAX_STREAMS &&
- 46 + mms->stream_num * 6 < sizeof(mms->out_buffer)) {
- mms->streams[mms->stream_num].id = stream_id;
- mms->stream_num++;
- } else {
- av_log(NULL, AV_LOG_ERROR,
- "Corrupt stream (too many A/V streams)\n");
- return AVERROR_INVALIDDATA;
- }
- } else if (!memcmp(p, ff_asf_head1_guid, sizeof(ff_asf_guid))) {
- chunksize = 46; // see references [2] section 3.4. This should be set 46.
- }
- p += chunksize;
- }
-
- return 0;
-}
-