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mpegpsdemux: Rework gap sending

Browse source 
Take the gap logic from mpegtsdemux, and don't
send gap events on a stream that's outputting buffers with
no timestamps. Time isn't advancing, but the stream has
buffers - so it's not sparse.

Fixes #2374

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4623>
This commit is contained in:
Jan Schmidt 2023-04-04 21:50:01 +10:00 committed by Tim-Philipp Müller
parent 0956b94184
commit 40cd8d5a96
2 changed files with 36 additions and 16 deletions
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42
subprojects/gst-plugins-bad/gst/mpegdemux/gstmpegdemux.c
View file

@ -59,8 +59,8 @@
#define SCAN_SCR_SZ 12
#define SCAN_PTS_SZ 80
#define SEGMENT_THRESHOLD (300*GST_MSECOND)
#define VIDEO_SEGMENT_THRESHOLD (500*GST_MSECOND)
#define DEFAULT_GAP_THRESHOLD (300*GST_MSECOND)
#define VIDEO_GAP_THRESHOLD (500*GST_MSECOND)
#define DURATION_SCAN_LIMIT 4 * 1024 * 1024
@ -417,7 +417,7 @@ gst_ps_demux_create_stream (GstPsDemux * demux, gint id, gint stream_type,
gchar *name;
GstPsDemuxClass *klass = GST_PS_DEMUX_GET_CLASS (demux);
GstCaps *caps;
GstClockTime threshold = SEGMENT_THRESHOLD;
GstClockTime gap_threshold = DEFAULT_GAP_THRESHOLD;
GstEvent *event;
gchar *stream_id;
@ -449,7 +449,7 @@ gst_ps_demux_create_stream (GstPsDemux * demux, gint id, gint stream_type,
"mpegversion", G_TYPE_INT, mpeg_version,
"systemstream", G_TYPE_BOOLEAN, FALSE,
"parsed", G_TYPE_BOOLEAN, FALSE, NULL);
threshold = VIDEO_SEGMENT_THRESHOLD;
gap_threshold = VIDEO_GAP_THRESHOLD;
break;
}
case ST_AUDIO_MPEG1:
@ -488,14 +488,14 @@ gst_ps_demux_create_stream (GstPsDemux * demux, gint id, gint stream_type,
name = g_strdup_printf ("video_%02x", id);
caps = gst_caps_new_simple ("video/x-h264",
"stream-format", G_TYPE_STRING, "byte-stream", NULL);
threshold = VIDEO_SEGMENT_THRESHOLD;
gap_threshold = VIDEO_GAP_THRESHOLD;
break;
case ST_VIDEO_H265:
template = klass->video_template;
name = g_strdup_printf ("video_%02x", id);
caps = gst_caps_new_simple ("video/x-h265",
"stream-format", G_TYPE_STRING, "byte-stream", NULL);
threshold = VIDEO_SEGMENT_THRESHOLD;
gap_threshold = VIDEO_GAP_THRESHOLD;
break;
case ST_PS_AUDIO_AC3:
@ -542,7 +542,11 @@ gst_ps_demux_create_stream (GstPsDemux * demux, gint id, gint stream_type,
stream->type = stream_type;
stream->pending_tags = NULL;
stream->pad = gst_pad_new_from_template (template, name);
stream->segment_thresh = threshold;
stream->gap_threshold = gap_threshold;
stream->nb_out_buffers = 0;
stream->gap_ref_buffers = 0;
stream->gap_ref_pts = GST_CLOCK_TIME_NONE;
gst_pad_set_event_function (stream->pad,
GST_DEBUG_FUNCPTR (gst_ps_demux_src_event));
gst_pad_set_query_function (stream->pad,
@ -766,6 +770,8 @@ gst_ps_demux_send_data (GstPsDemux * demux, GstPsStream * stream,
GST_TIME_FORMAT ", size %" G_GSIZE_FORMAT,
stream->id, stream->type, GST_TIME_ARGS (pts), gst_buffer_get_size (buf));
result = gst_pad_push (stream->pad, buf);
stream->nb_out_buffers += 1;
GST_LOG_OBJECT (demux, "result: %s", gst_flow_get_name (result));
return result;
@ -1001,13 +1007,13 @@ gst_ps_demux_clear_times (GstPsDemux * demux)
}
static inline void
gst_ps_demux_send_gap_updates (GstPsDemux * demux, GstClockTime new_start)
gst_ps_demux_send_gap_updates (GstPsDemux * demux, GstClockTime time)
{
GstClockTime base_time, stop;
gint i, count = demux->found_count;
GstEvent *event = NULL;
if (new_start == GST_CLOCK_TIME_NONE)
if (time == GST_CLOCK_TIME_NONE)
return;
/* Advance all lagging streams by sending a gap event */
@ -1018,7 +1024,7 @@ gst_ps_demux_send_gap_updates (GstPsDemux * demux, GstClockTime new_start)
if (stop != GST_CLOCK_TIME_NONE)
stop += base_time;
if (new_start > stop)
if (time > stop)
return;
/* FIXME: Handle reverse playback */
@ -1030,19 +1036,25 @@ gst_ps_demux_send_gap_updates (GstPsDemux * demux, GstClockTime new_start)
stream->last_ts < demux->src_segment.start + base_time)
stream->last_ts = demux->src_segment.start + base_time;
if (stream->last_ts + stream->segment_thresh < new_start) {
if (stream->last_ts + stream->gap_threshold < time &&
stream->nb_out_buffers == stream->gap_ref_buffers &&
stream->gap_ref_pts != stream->last_ts) {
/* should send segment info before gap event */
gst_ps_demux_send_segment (demux, stream, GST_CLOCK_TIME_NONE);
GST_LOG_OBJECT (demux,
"Sending gap update to pad %s from time %" GST_TIME_FORMAT " to %"
GST_TIME_FORMAT, GST_PAD_NAME (stream->pad),
GST_TIME_ARGS (stream->last_ts), GST_TIME_ARGS (new_start));
event =
gst_event_new_gap (stream->last_ts, new_start - stream->last_ts);
GST_TIME_ARGS (stream->last_ts), GST_TIME_ARGS (time));
event = gst_event_new_gap (stream->last_ts, time - stream->last_ts);
gst_pad_push_event (stream->pad, event);
stream->last_ts = new_start;
stream->last_ts = time;
}
/* Update GAP tracking vars so we don't re-check this stream for a while */
stream->gap_ref_pts = time;
if (stream->last_ts != GST_CLOCK_TIME_NONE && stream->last_ts > time)
stream->gap_ref_pts = stream->last_ts;
}
}
}

10
subprojects/gst-plugins-bad/gst/mpegdemux/gstmpegdemux.h
View file

@ -92,7 +92,15 @@ struct _GstPsStream
gint id;
gint type;
GstClockTime segment_thresh;
/* Threshold for sending a GAP event on this stream */
GstClockTime gap_threshold;
/* Reference PTS used to detect gaps */
GstClockTime gap_ref_pts;
/* Number of outputted buffers */
guint32 nb_out_buffers;
/* Reference number of buffers for gaps */
guint32 gap_ref_buffers;
GstClockTime last_ts;
gboolean discont;