{
AVIOContext *pb = matroska->ctx->pb;
uint32_t id;
- matroska->current_id = 0;
- matroska->num_levels = 0;
/* Try to seek to the last position to resync from. If this doesn't work,
* we resync from the earliest position available: The start of the buffer. */
id == MATROSKA_ID_CUES || id == MATROSKA_ID_TAGS ||
id == MATROSKA_ID_SEEKHEAD || id == MATROSKA_ID_ATTACHMENTS ||
id == MATROSKA_ID_CLUSTER || id == MATROSKA_ID_CHAPTERS) {
- matroska->current_id = id;
+ /* Prepare the context for parsing of a level 1 element. */
+ matroska_reset_status(matroska, id, -1);
+ /* Given that we are here means that an error has occured,
+ * so treat the segment as unknown length in order not to
+ * discard valid data that happens to be beyond the designated
+ * end of the segment. */
+ matroska->levels[0].length = EBML_UNKNOWN_LENGTH;
return 0;
}
id = (id << 8) | avio_r8(pb);
matroska->current_id = 0;
ret = ebml_parse(matroska, matroska_segment, matroska);
-
- /* remove dummy level */
- while (matroska->num_levels) {
- uint64_t length = matroska->levels[--matroska->num_levels].length;
- if (length == EBML_UNKNOWN_LENGTH)
- break;
- }
}
}
- /* seek back */
- avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
- matroska->current_id = saved_id;
+ /* Seek back - notice that in all instances where this is used it is safe
+ * to set the level to 1 and unset the position of the current cluster. */
+ matroska_reset_status(matroska, saved_id, before_pos);
return ret;
}
timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
- avio_seek(s->pb, st->index_entries[st->nb_index_entries - 1].pos,
- SEEK_SET);
- matroska->current_id = 0;
+ matroska_reset_status(matroska, 0, st->index_entries[st->nb_index_entries - 1].pos);
while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
matroska_clear_queue(matroska);
if (matroska_parse_cluster(matroska) < 0)
tracks[i].end_timecode = 0;
}
- avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET);
- matroska->current_id = 0;
+ /* We seek to a level 1 element, so set the appropriate status. */
+ matroska_reset_status(matroska, 0, st->index_entries[index].pos);
if (flags & AVSEEK_FLAG_ANY) {
st->skip_to_keyframe = 0;
matroska->skip_to_timecode = timestamp;
}
matroska->skip_to_keyframe = 1;
matroska->done = 0;
- matroska->num_levels = 0;
ff_update_cur_dts(s, st, st->index_entries[index].timestamp);
return 0;
err:
// slightly hackish but allows proper fallback to
// the generic seeking code.
+ matroska_reset_status(matroska, 0, -1);
matroska_clear_queue(matroska);
- matroska->current_id = 0;
st->skip_to_keyframe =
matroska->skip_to_keyframe = 0;
matroska->done = 0;
- matroska->num_levels = 0;
return -1;
}
static int webm_clusters_start_with_keyframe(AVFormatContext *s)
{
MatroskaDemuxContext *matroska = s->priv_data;
+ uint32_t id = matroska->current_id;
int64_t cluster_pos, before_pos;
int index, rv = 1;
if (s->streams[0]->nb_index_entries <= 0) return 0;
read = ebml_read_length(matroska, matroska->ctx->pb, &cluster_length);
if (read < 0)
break;
- avio_seek(s->pb, cluster_pos, SEEK_SET);
- matroska->current_id = 0;
+
+ matroska_reset_status(matroska, 0, cluster_pos);
matroska_clear_queue(matroska);
if (matroska_parse_cluster(matroska) < 0 ||
!matroska->queue) {
break;
}
}
- avio_seek(s->pb, before_pos, SEEK_SET);
+
+ /* Restore the status after matroska_read_header: */
+ matroska_reset_status(matroska, id, before_pos);
+
return rv;
}