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Add initial support for seeking in push mode
This commit is contained in:
Sebastian Dröge
parent
99298da3d5
commit
0ac0645de6
1 changed files with 226 additions and 73 deletions
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@ -2243,86 +2243,113 @@ from_index:
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}
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GST_DEBUG_OBJECT (demux, "Not found in index");
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demux->offset = demux->run_in;
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if (etrack->offsets && etrack->offsets->len) {
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for (i = etrack->offsets->len - 1; i >= 0; i--) {
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GstMXFDemuxIndex *idx =
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&g_array_index (etrack->offsets, GstMXFDemuxIndex, i);
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if (!demux->random_access) {
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guint64 new_offset = -1;
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gint64 new_position = -1;
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if (idx->offset != 0 && i <= *position) {
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demux->offset = idx->offset + demux->run_in;
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break;
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}
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}
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}
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gst_mxf_demux_set_partition_for_offset (demux, demux->offset);
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if (etrack->offsets && etrack->offsets->len) {
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for (i = etrack->offsets->len - 1; i >= 0; i--) {
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GstMXFDemuxIndex *idx =
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&g_array_index (etrack->offsets, GstMXFDemuxIndex, i);
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for (i = 0; i < demux->essence_tracks->len; i++) {
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GstMXFDemuxEssenceTrack *t =
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&g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
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t->position = (demux->offset == demux->run_in) ? 0 : -1;
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}
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/* Else peek at all essence elements and complete our
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* index until we find the requested element
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*/
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while (ret == GST_FLOW_OK) {
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GstBuffer *buffer = NULL;
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MXFUL key;
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guint read = 0;
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ret =
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gst_mxf_demux_pull_klv_packet (demux, demux->offset, &key, &buffer,
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&read);
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if (ret == GST_FLOW_UNEXPECTED) {
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for (i = 0; i < demux->essence_tracks->len; i++) {
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GstMXFDemuxEssenceTrack *t =
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&g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
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if (t->position > 0)
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t->duration = t->position;
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}
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/* For the searched track this is really our position */
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etrack->duration = etrack->position;
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for (i = 0; i < demux->src->len; i++) {
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GstMXFDemuxPad *p = g_ptr_array_index (demux->src, i);
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if (!p->eos
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&& p->current_essence_track_position >=
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p->current_essence_track->duration) {
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p->eos = TRUE;
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gst_pad_push_event (GST_PAD_CAST (p), gst_event_new_eos ());
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if (idx->offset != 0 && i <= *position && (!keyframe || idx->keyframe)) {
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new_offset = idx->offset;
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new_position = i;
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break;
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}
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}
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}
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if (G_UNLIKELY (ret != GST_FLOW_OK))
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break;
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ret = gst_mxf_demux_handle_klv_packet (demux, &key, buffer, TRUE);
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gst_buffer_unref (buffer);
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/* If we found the position read it from the index again */
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if (ret == GST_FLOW_OK && etrack->position == *position + 1 &&
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etrack->offsets && etrack->offsets->len > *position &&
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g_array_index (etrack->offsets, GstMXFDemuxIndex,
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*position).offset != 0) {
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GST_DEBUG_OBJECT (demux, "Found at offset %" G_GUINT64_FORMAT,
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demux->offset);
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demux->offset = old_offset;
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demux->current_partition = old_partition;
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goto from_index;
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if (new_offset != -1) {
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*position = new_position;
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return new_offset;
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}
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demux->offset += read;
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}
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} else if (demux->random_access) {
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demux->offset = demux->run_in;
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if (etrack->offsets && etrack->offsets->len) {
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for (i = etrack->offsets->len - 1; i >= 0; i--) {
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GstMXFDemuxIndex *idx =
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&g_array_index (etrack->offsets, GstMXFDemuxIndex, i);
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GST_DEBUG_OBJECT (demux, "Not found in this file");
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demux->offset = old_offset;
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demux->current_partition = old_partition;
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if (idx->offset != 0 && i <= *position) {
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demux->offset = idx->offset + demux->run_in;
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break;
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}
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}
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}
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gst_mxf_demux_set_partition_for_offset (demux, demux->offset);
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for (i = 0; i < demux->essence_tracks->len; i++) {
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GstMXFDemuxEssenceTrack *t =
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&g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
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t->position = (demux->offset == demux->run_in) ? 0 : -1;
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}
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/* Else peek at all essence elements and complete our
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* index until we find the requested element
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*/
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while (ret == GST_FLOW_OK) {
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GstBuffer *buffer = NULL;
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MXFUL key;
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guint read = 0;
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ret =
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gst_mxf_demux_pull_klv_packet (demux, demux->offset, &key, &buffer,
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&read);
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if (ret == GST_FLOW_UNEXPECTED) {
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for (i = 0; i < demux->essence_tracks->len; i++) {
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GstMXFDemuxEssenceTrack *t =
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&g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack,
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i);
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if (t->position > 0)
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t->duration = t->position;
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}
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/* For the searched track this is really our position */
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etrack->duration = etrack->position;
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for (i = 0; i < demux->src->len; i++) {
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GstMXFDemuxPad *p = g_ptr_array_index (demux->src, i);
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if (!p->eos
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&& p->current_essence_track_position >=
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p->current_essence_track->duration) {
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p->eos = TRUE;
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gst_pad_push_event (GST_PAD_CAST (p), gst_event_new_eos ());
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}
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}
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}
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if (G_UNLIKELY (ret != GST_FLOW_OK)) {
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demux->offset = old_offset;
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demux->current_partition = old_partition;
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break;
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}
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ret = gst_mxf_demux_handle_klv_packet (demux, &key, buffer, TRUE);
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gst_buffer_unref (buffer);
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/* If we found the position read it from the index again */
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if (ret == GST_FLOW_OK && etrack->position == *position + 1 &&
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etrack->offsets && etrack->offsets->len > *position &&
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g_array_index (etrack->offsets, GstMXFDemuxIndex,
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*position).offset != 0) {
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GST_DEBUG_OBJECT (demux, "Found at offset %" G_GUINT64_FORMAT,
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demux->offset);
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demux->offset = old_offset;
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demux->current_partition = old_partition;
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goto from_index;
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}
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demux->offset += read;
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}
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demux->offset = old_offset;
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demux->current_partition = old_partition;
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GST_DEBUG_OBJECT (demux, "Not found in this file");
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}
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return -1;
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}
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@ -2795,6 +2822,132 @@ gst_mxf_demux_pad_set_position (GstMXFDemux * demux, GstMXFDemuxPad * p,
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p->material_track->edit_rate.d * GST_SECOND);
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}
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static gboolean
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gst_mxf_demux_seek_push (GstMXFDemux * demux, GstEvent * event)
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{
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GstFormat format;
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GstSeekFlags flags;
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GstSeekType start_type, stop_type;
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gint64 start, stop;
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gdouble rate;
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gboolean update, flush, keyframe;
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GstSegment seeksegment;
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guint i;
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gst_event_parse_seek (event, &rate, &format, &flags,
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&start_type, &start, &stop_type, &stop);
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if (rate <= 0.0)
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goto wrong_rate;
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if (format != GST_FORMAT_TIME)
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goto wrong_format;
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flush = !!(flags & GST_SEEK_FLAG_FLUSH);
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keyframe = !!(flags & GST_SEEK_FLAG_KEY_UNIT);
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/* Work on a copy until we are sure the seek succeeded. */
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memcpy (&seeksegment, &demux->segment, sizeof (GstSegment));
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GST_DEBUG_OBJECT (demux, "segment before configure %" GST_SEGMENT_FORMAT,
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&demux->segment);
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/* Apply the seek to our segment */
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gst_segment_set_seek (&seeksegment, rate, format, flags,
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start_type, start, stop_type, stop, &update);
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GST_DEBUG_OBJECT (demux, "segment configured %" GST_SEGMENT_FORMAT,
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&seeksegment);
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if (flush || seeksegment.last_stop != demux->segment.last_stop) {
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gboolean ret;
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guint64 new_offset = -1;
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if (!demux->metadata_resolved) {
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if (gst_mxf_demux_resolve_references (demux) != GST_FLOW_OK)
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goto unresolved_metadata;
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}
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/* Do the actual seeking */
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for (i = 0; i < demux->src->len; i++) {
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GstMXFDemuxPad *p = g_ptr_array_index (demux->src, i);
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gint64 position;
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guint64 off;
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/* Reset EOS flag on all pads */
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p->eos = FALSE;
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p->last_flow = GST_FLOW_OK;
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gst_mxf_demux_pad_set_position (demux, p, start);
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position = p->current_essence_track_position;
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off = gst_mxf_demux_find_essence_element (demux, p->current_essence_track,
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&position, keyframe);
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new_offset = MIN (off, new_offset);
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p->discont = TRUE;
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}
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if (new_offset == -1)
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goto no_new_offset;
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new_offset += demux->run_in;
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GST_DEBUG_OBJECT (demux, "generating an upstream seek at position %"
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G_GUINT64_FORMAT, new_offset);
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ret = gst_pad_push_event (demux->sinkpad,
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gst_event_new_seek (seeksegment.rate, GST_FORMAT_BYTES,
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seeksegment.flags | GST_SEEK_FLAG_ACCURATE, GST_SEEK_TYPE_SET,
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new_offset, GST_SEEK_TYPE_NONE, 0));
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if (G_UNLIKELY (!ret)) {
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goto seek_failed;
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}
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}
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/* Tell all the stream a new segment is needed */
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for (i = 0; i < demux->src->len; i++) {
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GstMXFDemuxPad *p = g_ptr_array_index (demux->src, i);
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p->need_segment = TRUE;
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}
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for (i = 0; i < demux->essence_tracks->len; i++) {
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GstMXFDemuxEssenceTrack *t =
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&g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
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t->position = -1;
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}
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/* Ok seek succeeded, take the newly configured segment */
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memcpy (&demux->segment, &seeksegment, sizeof (GstSegment));
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return TRUE;
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/* ERRORS */
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wrong_format:
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{
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GST_WARNING_OBJECT (demux, "seeking only supported in TIME format");
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return gst_pad_push_event (demux->sinkpad, gst_event_ref (event));
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}
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wrong_rate:
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{
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GST_WARNING_OBJECT (demux, "only rates > 0.0 are allowed");
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return FALSE;
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}
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unresolved_metadata:
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{
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GST_WARNING_OBJECT (demux, "metadata can't be resolved");
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return gst_pad_push_event (demux->sinkpad, gst_event_ref (event));
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}
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seek_failed:
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{
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GST_WARNING_OBJECT (demux, "upstream seek failed");
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return gst_pad_push_event (demux->sinkpad, gst_event_ref (event));
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}
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no_new_offset:
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{
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GST_WARNING_OBJECT (demux, "can't find new offset");
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return gst_pad_push_event (demux->sinkpad, gst_event_ref (event));
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}
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}
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static gboolean
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gst_mxf_demux_seek_pull (GstMXFDemux * demux, GstEvent * event)
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{
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@ -2974,7 +3127,7 @@ gst_mxf_demux_src_event (GstPad * pad, GstEvent * event)
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if (demux->random_access)
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ret = gst_mxf_demux_seek_pull (demux, event);
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else
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ret = FALSE;
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ret = gst_mxf_demux_seek_push (demux, event);
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gst_event_unref (event);
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break;
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default:
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