void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance) { int ist1, ist2; int64_t pos_delta = 0; //We could use URLProtocol flags here but as many user applications do not use URLProtocols this would be unreliable const char *proto = avio_find_protocol_name(s->filename); if (!(strcmp(proto, "file") && strcmp(proto, "pipe") && strcmp(proto, "cache"))) return; for (ist1 = 0; ist1 < s->nb_streams; ist1++) { AVStream *st1 = s->streams[ist1]; for (ist2 = 0; ist2 < s->nb_streams; ist2++) { AVStream *st2 = s->streams[ist2]; int i1, i2; if (ist1 == ist2) continue; for (i1 = i2 = 0; i1 < st1->nb_index_entries; i1++) { AVIndexEntry *e1 = &st1->index_entries[i1]; int64_t e1_pts = av_rescale_q(e1->timestamp, st1->time_base, AV_TIME_BASE_Q); for (; i2 < st2->nb_index_entries; i2++) { AVIndexEntry *e2 = &st2->index_entries[i2]; int64_t e2_pts = av_rescale_q(e2->timestamp, st2->time_base, AV_TIME_BASE_Q); if (e2_pts - e1_pts < time_tolerance) continue; pos_delta = FFMAX(pos_delta, e1->pos - e2->pos); break; } } } } pos_delta *= 2; /* XXX This could be adjusted depending on protocol*/ if (s->pb->buffer_size < pos_delta && pos_delta < (1<<24)) { av_log(s, AV_LOG_VERBOSE, "Reconfiguring buffers to size %"PRId64"\n", pos_delta); ffio_set_buf_size(s->pb, pos_delta); s->pb->short_seek_threshold = FFMAX(s->pb->short_seek_threshold, pos_delta/2); } }