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qtdemux: implement support for trickmode interval

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When the seek event contains a (newly-added) trickmode interval,
and TRICKMODE_KEY_UNITS was requested, only let through keyframes
separated with the required interval
This commit is contained in:
Mathieu Duponchelle 2019-07-12 20:51:44 +02:00
parent 9336326b3d
commit 5fde140e6e
2 changed files with 35 additions and 4 deletions
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36
gst/isomp4/qtdemux.c
View file

@ -452,6 +452,9 @@ struct _QtDemuxStream
gpointer protection_scheme_info; /* specific to the protection scheme */
GQueue protection_scheme_event_queue;
/* KEY_UNITS trickmode with an interval */
GstClockTime last_keyframe_dts;
gint ref_count; /* atomic */
};
@ -1608,6 +1611,7 @@ gst_qtdemux_perform_seek (GstQTDemux * qtdemux, GstSegment * segment,
stream->offset_in_sample = 0;
stream->segment_index = -1;
stream->sent_eos = FALSE;
stream->last_keyframe_dts = GST_CLOCK_TIME_NONE;
if (segment->flags & GST_SEEK_FLAG_FLUSH)
gst_segment_init (&stream->segment, GST_FORMAT_TIME);
@ -1785,6 +1789,9 @@ gst_qtdemux_handle_src_event (GstPad * pad, GstObject * parent,
goto upstream;
}
gst_event_parse_seek_trickmode_interval (event,
&qtdemux->trickmode_interval);
/* Build complete index for seeking;
* if not a fragmented file at least */
if (!qtdemux->fragmented)
@ -2165,6 +2172,7 @@ gst_qtdemux_reset (GstQTDemux * qtdemux, gboolean hard)
if (hard) {
qtdemux->segment_seqnum = GST_SEQNUM_INVALID;
qtdemux->trickmode_interval = 0;
g_ptr_array_remove_range (qtdemux->active_streams,
0, qtdemux->active_streams->len);
g_ptr_array_remove_range (qtdemux->old_streams,
@ -2204,6 +2212,7 @@ gst_qtdemux_reset (GstQTDemux * qtdemux, gboolean hard)
stream->sent_eos = FALSE;
stream->time_position = 0;
stream->accumulated_base = 0;
stream->last_keyframe_dts = GST_CLOCK_TIME_NONE;
}
}
}
@ -6370,10 +6379,29 @@ gst_qtdemux_loop_state_movie (GstQTDemux * qtdemux)
/* If we're doing a keyframe-only trickmode, only push keyframes on video streams */
if (G_UNLIKELY (qtdemux->segment.
flags & GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS)) {
if (stream->subtype == FOURCC_vide && !keyframe) {
GST_LOG_OBJECT (qtdemux, "Skipping non-keyframe on track-id %u",
stream->track_id);
goto next;
if (stream->subtype == FOURCC_vide) {
if (!keyframe) {
GST_LOG_OBJECT (qtdemux, "Skipping non-keyframe on track-id %u",
stream->track_id);
goto next;
} else if (qtdemux->trickmode_interval > 0) {
GstClockTimeDiff interval;
if (qtdemux->segment.rate > 0)
interval = stream->time_position - stream->last_keyframe_dts;
else
interval = stream->last_keyframe_dts - stream->time_position;
if (GST_CLOCK_TIME_IS_VALID (stream->last_keyframe_dts)
&& interval < qtdemux->trickmode_interval) {
GST_LOG_OBJECT (qtdemux,
"Skipping keyframe within interval on track-id %u",
stream->track_id);
goto next;
} else {
stream->last_keyframe_dts = stream->time_position;
}
}
}
}

3
gst/isomp4/qtdemux.h
View file

@ -118,6 +118,9 @@ struct _GstQTDemux {
/* configured playback region */
GstSegment segment;
/* State for key_units trickmode */
GstClockTime trickmode_interval;
/* PUSH-BASED only: If the initial segment event, or a segment consequence of
* a seek or incoming TIME segment from upstream needs to be pushed. This
* variable is used instead of pushing the event directly because at that