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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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baseparse: proper and more extended segment and seek handling
That is, loop pause handling, segment seek support, newsegment for gaps, etc
This commit is contained in:
Mark Nauwelaerts
Tim-Philipp Müller
parent
4d20688af3
commit
3304f194a9
1 changed files with 152 additions and 56 deletions
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@ -1323,17 +1323,73 @@ gst_base_parse_push_buffer (GstBaseParse * parse, GstBuffer * buffer)
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gst_buffer_set_caps (buffer, GST_PAD_CAPS (parse->srcpad));
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/* segment times are typically estimates,
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* actual frame data might lead subclass to different timestamps,
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* so override segment start from what is supplied there */
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if (G_UNLIKELY (parse->pending_segment && !parse->priv->passthrough &&
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GST_CLOCK_TIME_IS_VALID (last_start))) {
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gst_event_unref (parse->pending_segment);
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/* stop time possibly lost this way,
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* but unlikely and not really supported */
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parse->pending_segment =
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gst_event_new_new_segment (FALSE, parse->segment.rate,
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parse->segment.format, last_start, -1, last_start);
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/* segment adjustment magic; only if we are running the whole show */
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if (!parse->priv->passthrough &&
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(parse->priv->pad_mode == GST_ACTIVATE_PULL ||
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parse->priv->upstream_seekable)) {
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/* segment times are typically estimates,
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* actual frame data might lead subclass to different timestamps,
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* so override segment start from what is supplied there */
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if (G_UNLIKELY (parse->pending_segment &&
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GST_CLOCK_TIME_IS_VALID (last_start))) {
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gst_event_unref (parse->pending_segment);
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parse->segment.start =
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MIN ((guint64) last_start, (guint64) parse->segment.stop);
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GST_DEBUG_OBJECT (parse,
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"adjusting pending segment start to %" GST_TIME_FORMAT,
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GST_TIME_ARGS (parse->segment.start));
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parse->pending_segment =
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gst_event_new_new_segment (FALSE, parse->segment.rate,
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parse->segment.format, parse->segment.start, parse->segment.stop,
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parse->segment.start);
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}
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/* handle gaps, e.g. non-zero start-time, in as much not handled by above */
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if (GST_CLOCK_TIME_IS_VALID (parse->segment.last_stop) &&
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GST_CLOCK_TIME_IS_VALID (last_start)) {
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GstClockTimeDiff diff;
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/* only send newsegments with increasing start times,
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* otherwise if these go back and forth downstream (sinks) increase
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* accumulated time and running_time */
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diff = GST_CLOCK_DIFF (parse->segment.last_stop, last_start);
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if (G_UNLIKELY (diff > 2 * GST_SECOND && last_start > parse->segment.start
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&& (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop) ||
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last_start < parse->segment.stop))) {
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GST_DEBUG_OBJECT (parse,
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"Gap of %" G_GINT64_FORMAT " ns detected in stream "
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"(%" GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
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"Sending updated NEWSEGMENT events", diff,
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GST_TIME_ARGS (parse->segment.last_stop),
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GST_TIME_ARGS (last_start));
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if (G_UNLIKELY (parse->pending_segment)) {
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gst_event_unref (parse->pending_segment);
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parse->segment.start = last_start;
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parse->pending_segment =
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gst_event_new_new_segment (FALSE, parse->segment.rate,
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parse->segment.format, parse->segment.start, parse->segment.stop,
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parse->segment.start);
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} else {
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/* send newsegment events such that the gap is not accounted in
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* accum time, hence running_time */
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/* close ahead of gap */
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gst_pad_push_event (parse->srcpad,
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gst_event_new_new_segment (TRUE, parse->segment.rate,
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parse->segment.format, parse->segment.last_stop,
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parse->segment.last_stop, parse->segment.last_stop));
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/* skip gap */
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gst_pad_push_event (parse->srcpad,
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gst_event_new_new_segment (FALSE, parse->segment.rate,
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parse->segment.format, last_start, parse->segment.stop,
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last_start));
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}
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/* align segment view with downstream,
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* prevents double-counting accum when closing segment */
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gst_segment_set_newsegment (&parse->segment, FALSE,
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parse->segment.rate, parse->segment.format, last_start,
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parse->segment.stop, last_start);
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parse->segment.last_stop = last_start;
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}
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}
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}
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/* and should then also be linked downstream, so safe to send some events */
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@ -1405,10 +1461,17 @@ gst_base_parse_push_buffer (GstBaseParse * parse, GstBuffer * buffer)
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gst_buffer_unref (buffer);
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GST_LOG_OBJECT (parse, "frame (%d bytes) not pushed: %s",
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GST_BUFFER_SIZE (buffer), gst_flow_get_name (ret));
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/* if we are not sufficiently in control, let upstream decide on EOS */
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if (ret == GST_FLOW_UNEXPECTED &&
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(parse->priv->passthrough ||
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(parse->priv->pad_mode == GST_ACTIVATE_PUSH &&
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!parse->priv->upstream_seekable)))
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ret = GST_FLOW_OK;
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}
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/* Update current running segment position */
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if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE)
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if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE &&
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parse->segment.last_stop < last_stop)
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gst_segment_set_last_stop (&parse->segment, GST_FORMAT_TIME, last_stop);
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return ret;
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@ -1729,7 +1792,7 @@ gst_base_parse_loop (GstPad * pad)
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if (ret == GST_FLOW_UNEXPECTED)
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goto eos;
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else if (ret != GST_FLOW_OK)
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goto need_pause;
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goto pause;
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if (parse->priv->discont) {
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GST_DEBUG_OBJECT (parse, "marking DISCONT");
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@ -1779,7 +1842,7 @@ gst_base_parse_loop (GstPad * pad)
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if (ret == GST_FLOW_UNEXPECTED)
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goto eos;
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else if (ret != GST_FLOW_OK)
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goto need_pause;
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goto pause;
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if (GST_BUFFER_SIZE (outbuf) < fsize)
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goto eos;
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}
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@ -1793,34 +1856,67 @@ gst_base_parse_loop (GstPad * pad)
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/* This always unrefs the outbuf, even if error occurs */
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ret = gst_base_parse_handle_and_push_buffer (parse, klass, outbuf);
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if (ret != GST_FLOW_OK) {
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GST_DEBUG_OBJECT (parse, "flow: %s", gst_flow_get_name (ret));
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if (ret == GST_FLOW_UNEXPECTED) {
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gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
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} else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_UNEXPECTED) {
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GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
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("streaming task paused, reason: %s", gst_flow_get_name (ret)));
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gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
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}
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goto need_pause;
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}
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if (ret != GST_FLOW_OK)
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goto pause;
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done:
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gst_object_unref (parse);
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return;
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need_pause:
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{
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GST_LOG_OBJECT (parse, "pausing task %d", ret);
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gst_pad_pause_task (pad);
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gst_object_unref (parse);
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return;
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}
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/* ERRORS */
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eos:
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{
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GST_LOG_OBJECT (parse, "sending eos");
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gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
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goto need_pause;
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ret = GST_FLOW_UNEXPECTED;
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GST_DEBUG_OBJECT (parse, "eos");
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/* fall-through */
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}
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pause:
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{
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gboolean push_eos = FALSE;
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GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
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gst_flow_get_name (ret));
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gst_pad_pause_task (parse->sinkpad);
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if (ret == GST_FLOW_UNEXPECTED) {
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/* handle end-of-stream/segment */
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if (parse->segment.flags & GST_SEEK_FLAG_SEGMENT) {
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gint64 stop;
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if ((stop = parse->segment.stop) == -1)
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stop = parse->segment.duration;
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GST_DEBUG_OBJECT (parse, "sending segment_done");
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gst_element_post_message
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(GST_ELEMENT_CAST (parse),
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gst_message_new_segment_done (GST_OBJECT_CAST (parse),
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GST_FORMAT_TIME, stop));
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} else {
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/* If we STILL have zero frames processed, fire an error */
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if (parse->priv->framecount == 0) {
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GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
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("No valid frames found before end of stream"), (NULL));
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}
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push_eos = TRUE;
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}
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} else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_UNEXPECTED) {
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/* for fatal errors we post an error message, wrong-state is
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* not fatal because it happens due to flushes and only means
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* that we should stop now. */
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GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
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("streaming stopped, reason %s", gst_flow_get_name (ret)));
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push_eos = TRUE;
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}
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if (push_eos) {
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/* newsegment before eos */
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if (parse->pending_segment) {
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gst_pad_push_event (parse->srcpad, parse->pending_segment);
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parse->pending_segment = NULL;
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}
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gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
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}
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gst_object_unref (parse);
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}
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}
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@ -2368,7 +2464,8 @@ gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
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if (rate < 0.0)
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goto negative_rate;
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if (cur_type != GST_SEEK_TYPE_SET)
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if (cur_type != GST_SEEK_TYPE_SET ||
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(stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
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goto wrong_type;
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/* For any format other than TIME, see if upstream handles
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@ -2384,14 +2481,6 @@ gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
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}
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}
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/* too much estimating going on to support this sensibly,
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* and no eos/end-of-segment loop handling either ... */
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if ((stop_type == GST_SEEK_TYPE_SET && stop != GST_CLOCK_TIME_NONE) ||
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(stop_type != GST_SEEK_TYPE_NONE && stop_type != GST_SEEK_TYPE_SET) ||
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(flags & GST_SEEK_FLAG_SEGMENT))
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goto wrong_type;
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stop = -1;
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/* get flush flag */
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flush = flags & GST_SEEK_FLAG_FLUSH;
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@ -2403,17 +2492,10 @@ gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
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gst_segment_set_seek (&seeksegment, rate, format, flags,
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cur_type, cur, stop_type, stop, &update);
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/* figure out the last position we need to play. If it's configured (stop !=
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* -1), use that, else we play until the total duration of the file */
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if ((stop = seeksegment.stop) == -1)
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stop = seeksegment.duration;
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dstformat = GST_FORMAT_BYTES;
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if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.last_stop,
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&dstformat, &seekpos)) {
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GST_DEBUG_OBJECT (parse, "conversion failed");
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return FALSE;
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}
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&dstformat, &seekpos))
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goto convert_failed;
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GST_DEBUG_OBJECT (parse,
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"seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT, cur,
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@ -2476,8 +2558,8 @@ gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
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/* This will be sent later in _loop() */
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parse->pending_segment =
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gst_event_new_new_segment (FALSE, parse->segment.rate,
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parse->segment.format,
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parse->segment.last_stop, stop, parse->segment.last_stop);
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parse->segment.format, parse->segment.last_stop, parse->segment.stop,
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parse->segment.last_stop);
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GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
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"start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
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@ -2502,12 +2584,20 @@ gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
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GST_PAD_STREAM_UNLOCK (parse->sinkpad);
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} else {
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GstEvent *new_event;
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gint64 stop_pos;
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/* The only thing we need to do in PUSH-mode is to send the
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seek event (in bytes) to upstream. Segment / flush handling happens
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in corresponding src event handlers */
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GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
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/* already converted start, need same for stop */
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dstformat = GST_FORMAT_BYTES;
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if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.start,
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&dstformat, &stop_pos))
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goto convert_failed;
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new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flush,
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GST_SEEK_TYPE_SET, seekpos, stop_type, stop);
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GST_SEEK_TYPE_SET, seekpos, stop_type, stop_pos);
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res = gst_pad_push_event (parse->sinkpad, new_event);
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}
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@ -2528,6 +2618,12 @@ wrong_type:
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res = FALSE;
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goto done;
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}
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convert_failed:
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{
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GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
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res = FALSE;
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goto done;
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}
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}
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/**
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