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mpegdemux: take into account offset of first buffer

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This fixes playback when the source starts later than the playback
pipeline, and when a source drops for a while then restarts.

https://bugzilla.gnome.org/show_bug.cgi?id=657794
This commit is contained in:
Vincent Penquerc'h 2011-09-05 17:40:07 +01:00
parent 918d2e710f
commit 9715fc3189
2 changed files with 72 additions and 2 deletions
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67
gst/mpegdemux/gstmpegtsdemux.c
View file

@ -336,6 +336,9 @@ gst_mpegts_demux_init (GstMpegTSDemux * demux)
demux->pcr[1] = -1;
demux->cache_duration = GST_CLOCK_TIME_NONE;
demux->base_pts = GST_CLOCK_TIME_NONE;
demux->in_gap = GST_CLOCK_TIME_NONE;
demux->first_buf_ts = GST_CLOCK_TIME_NONE;
demux->last_buf_ts = GST_CLOCK_TIME_NONE;
}
static void
@ -386,6 +389,10 @@ gst_mpegts_demux_reset (GstMpegTSDemux * demux)
g_object_unref (demux->clock);
demux->clock = NULL;
}
demux->in_gap = GST_CLOCK_TIME_NONE;
demux->first_buf_ts = GST_CLOCK_TIME_NONE;
demux->last_buf_ts = GST_CLOCK_TIME_NONE;
}
#if 0
@ -1166,10 +1173,35 @@ gst_mpegts_demux_data_cb (GstPESFilter * filter, gboolean first,
pts = -1;
}
if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (demux->in_gap))) {
if (GST_CLOCK_TIME_IS_VALID (demux->first_buf_ts)
&& GST_CLOCK_TIME_IS_VALID (filter->pts)) {
int i;
GstClockTime pts = GST_CLOCK_TIME_NONE;
for (i = 0; i < MPEGTS_MAX_PID + 1; i++) {
GstMpegTSStream *stream = demux->streams[i];
if (stream && (pts == GST_CLOCK_TIME_NONE || stream->last_time < pts)) {
pts = stream->last_time;
}
}
if (pts == GST_CLOCK_TIME_NONE)
pts = 0;
demux->in_gap = demux->first_buf_ts - pts;
GST_INFO_OBJECT (demux, "Setting interpolation gap to %" GST_TIME_FORMAT,
GST_TIME_ARGS (demux->in_gap));
} else {
demux->in_gap = 0;
}
}
if (GST_CLOCK_TIME_IS_VALID (time)) {
time += demux->in_gap;
}
GST_DEBUG_OBJECT (demux, "setting PTS to (%" G_GUINT64_FORMAT ") time: %"
GST_TIME_FORMAT " on buffer %p first buffer: %d base_time: %"
GST_TIME_FORMAT, pts, GST_TIME_ARGS (time), buffer, first,
GST_TIME_ARGS (stream->base_time));
GST_TIME_FORMAT, pts, GST_TIME_ARGS (time + demux->in_gap),
buffer, first, GST_TIME_ARGS (stream->base_time));
GST_BUFFER_TIMESTAMP (buffer) = time;
@ -2720,6 +2752,9 @@ gst_mpegts_demux_sink_event (GstPad * pad, GstEvent * event)
gst_adapter_clear (demux->adapter);
gst_mpegts_demux_flush (demux, TRUE);
res = gst_mpegts_demux_send_event (demux, event);
demux->in_gap = GST_CLOCK_TIME_NONE;
demux->first_buf_ts = GST_CLOCK_TIME_NONE;
demux->last_buf_ts = GST_CLOCK_TIME_NONE;
break;
case GST_EVENT_EOS:
gst_mpegts_demux_flush (demux, FALSE);
@ -3060,7 +3095,35 @@ gst_mpegts_demux_chain (GstPad * pad, GstBuffer * buffer)
gint i;
guint sync_count;
if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer)) {
GstClockTime timestamp = GST_BUFFER_TIMESTAMP (buffer);
GST_DEBUG_OBJECT (demux, "Got chained buffer ts %" GST_TIME_FORMAT,
GST_TIME_ARGS (timestamp));
/* if we did not get a buffer for a while, assume the source has dried up,
and flush any stale data */
if (GST_CLOCK_TIME_IS_VALID (demux->last_buf_ts)) {
GstClockTimeDiff dt = timestamp - demux->last_buf_ts;
if (dt < 0 || dt > GST_SECOND / 2) {
GST_INFO_OBJECT (demux,
"Input timestamp discontinuity (%" GST_TIME_FORMAT
"), flushing stale data", GST_TIME_ARGS (dt));
gst_mpegts_demux_flush (demux, FALSE);
}
}
demux->last_buf_ts = timestamp;
/* lock on the first valid buffer timestamp */
if (G_UNLIKELY (demux->first_buf_ts == GST_CLOCK_TIME_NONE)) {
demux->first_buf_ts = timestamp;
GST_DEBUG_OBJECT (demux, "First timestamp is %" GST_TIME_FORMAT,
GST_TIME_ARGS (demux->first_buf_ts));
}
}
if (GST_BUFFER_IS_DISCONT (buffer)) {
GST_DEBUG_OBJECT (demux,
"Input buffer has DISCONT flag set, flushing data");
gst_mpegts_demux_flush (demux, FALSE);
}
/* first push the new buffer into the adapter */

7
gst/mpegdemux/gstmpegtsdemux.h
View file

@ -224,6 +224,13 @@ struct _GstMpegTSDemux {
/* Cached base_PCR in GStreamer time. */
GstClockTime base_pts;
/* base timings on first buffer timestamp */
GstClockTime first_buf_ts;
GstClockTime in_gap;
/* Detect when the source stops for a while, we will resync the interpolation gap */
GstClockTime last_buf_ts;
};
struct _GstMpegTSDemuxClass {