static int asf_write_header(AVFormatContext *s) { ASFContext *asf = s->priv_data; s->packet_size = PACKET_SIZE; s->max_interleave_delta = 0; asf->nb_packets = 0; asf->index_ptr = av_malloc(sizeof(ASFIndex) * ASF_INDEX_BLOCK); asf->nb_index_memory_alloc = ASF_INDEX_BLOCK; asf->maximum_packet = 0; /* the data-chunk-size has to be 50 (DATA_HEADER_SIZE), which is * data_size - asf->data_offset at the moment this function is done. * It is needed to use asf as a streamable format. */ if (asf_write_header1(s, 0, DATA_HEADER_SIZE) < 0) { //av_free(asf); return -1; } avio_flush(s->pb); asf->packet_nb_payloads = 0; asf->packet_timestamp_start = -1; asf->packet_timestamp_end = -1; ffio_init_context(&asf->pb, asf->packet_buf, s->packet_size, 1, NULL, NULL, NULL, NULL); if (s->avoid_negative_ts < 0) s->avoid_negative_ts = 1; return 0; }