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oggdemux: Timestamp tracking fixes

Browse source 
In gst_ogg_demux_do_seek() when calculating the
keyframe time, account for a non-zero start-time

Handle a discontinuous first packet in
gst_ogg_demux_setup_first_granule() because that's pretty
normal after a seek. Also differentiate between a genuinely
truncated first packet and just bailing out early, by not using
granule = -1 as an error code.

Make the debug output logs clearer about which timestamps
are stream times (PTS) and which are ogg timestamps.
This commit is contained in:
Jan Schmidt 2017-03-04 00:22:17 +11:00
parent 342132a700
commit fe1f47aa17
1 changed files with 38 additions and 21 deletions
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59
ext/ogg/gstoggdemux.c
View file

@ -1029,10 +1029,12 @@ gst_ogg_pad_submit_packet (GstOggPad * pad, ogg_packet * packet)
}
}
granule = gst_ogg_stream_granulepos_to_granule (&pad->map,
GST_DEBUG_OBJECT (ogg, "%p packet has granulepos %" G_GINT64_FORMAT, pad,
packet->granulepos);
granule =
gst_ogg_stream_granulepos_to_granule (&pad->map, packet->granulepos);
if (granule > 0) {
GST_DEBUG_OBJECT (ogg, "%p has granulepos %" G_GINT64_FORMAT, pad, granule);
GST_DEBUG_OBJECT (ogg, "%p has granule %" G_GINT64_FORMAT, pad, granule);
pad->current_granule = granule;
} else if (granule == 0) {
/* headers */
@ -1307,6 +1309,8 @@ gst_ogg_demux_setup_first_granule (GstOggDemux * ogg, GstOggPad * pad,
/* When we submit a page, we check if we have started tracking granules.
* If not, we calculate the granule corresponding to the first packet
* on the page. */
gboolean valid_granule = TRUE;
if (pad->current_granule == -1) {
ogg_int64_t granpos = ogg_page_granulepos (page);
if (granpos > 0) {
@ -1324,33 +1328,41 @@ gst_ogg_demux_setup_first_granule (GstOggDemux * ogg, GstOggPad * pad,
int last_size = pad->map.last_size;
memcpy (&os, &pad->map.stream, sizeof (os));
for (n = 0; n < packets; ++n) {
for (n = 0; valid_granule && n < packets; ++n) {
int ret = ogg_stream_packetout (&os, &op);
if (ret < 0) {
GST_WARNING_OBJECT (pad, "Failed to read packets off first page");
granule = -1;
/* This usually means a continued packet after a seek and we can't calc the first granule,
* but sometimes not - so if it's ret == -1 and first packet, try again */
if (ret == -1 && n == 0) {
n--;
continue;
}
GST_DEBUG_OBJECT (pad, "Failed to read packet off first page");
valid_granule = FALSE;
break;
}
if (ret == 0) {
GST_WARNING_OBJECT (pad,
"Short read getting %d packets off first page", packets);
granule = -1;
valid_granule = FALSE;
break;
}
duration = gst_ogg_stream_get_packet_duration (&pad->map, &op);
GST_DEBUG_OBJECT (pad, "Packet %d has duration %" G_GINT64_FORMAT, n,
duration);
GST_DEBUG_OBJECT (pad, "Packet %d has duration %" G_GINT64_FORMAT,
n, duration);
granule -= duration;
}
pad->map.last_size = last_size;
if (granule >= 0) {
pad->current_granule = granule;
GST_INFO_OBJECT (pad, "Starting with first granule %" G_GINT64_FORMAT,
granule);
} else {
pad->current_granule = 0;
GST_INFO_OBJECT (pad, "Extrapolated first granule is negative, "
"used to clip samples at start");
if (valid_granule) {
if (granule >= 0) {
pad->current_granule = granule;
GST_INFO_OBJECT (pad,
"Starting with first granule %" G_GINT64_FORMAT, granule);
} else {
pad->current_granule = 0;
GST_INFO_OBJECT (pad, "Extrapolated first granule is negative, "
"used to clip samples at start");
}
}
} else {
GST_WARNING_OBJECT (pad,
@ -1706,7 +1718,7 @@ gst_ogg_pad_handle_push_mode_state (GstOggPad * pad, ogg_page * page)
if (pad->push_sync_time == GST_CLOCK_TIME_NONE)
pad->push_sync_time = t;
GST_DEBUG_OBJECT (ogg, "Got timestamp %" GST_TIME_FORMAT " for %s",
GST_DEBUG_OBJECT (ogg, "Got PTS %" GST_TIME_FORMAT " for %s",
GST_TIME_ARGS (t), gst_ogg_stream_get_media_type (&pad->map));
sync_time = gst_ogg_demux_collect_sync_time (ogg, ogg->building_chain);
if (sync_time == GST_CLOCK_TIME_NONE) {
@ -3098,7 +3110,7 @@ do_binary_search (GstOggDemux * ogg, GstOggChain * chain, gint64 begin,
if (granuletime < pad->start_time)
continue;
GST_LOG_OBJECT (ogg, "granulepos %" G_GINT64_FORMAT " maps to time %"
GST_LOG_OBJECT (ogg, "granulepos %" G_GINT64_FORMAT " maps to PTS %"
GST_TIME_FORMAT, granulepos, GST_TIME_ARGS (granuletime));
granuletime -= pad->start_time;
@ -3309,7 +3321,7 @@ gst_ogg_demux_do_seek (GstOggDemux * ogg, GstSegment * segment,
ts = gst_ogg_stream_get_end_time_for_granulepos (&pad->map, granulepos);
if (GST_CLOCK_TIME_IS_VALID (ts)) {
if (first_ts == GST_CLOCK_TIME_NONE) {
GST_WARNING_OBJECT (pad, "Locking on ts %" GST_TIME_FORMAT,
GST_WARNING_OBJECT (pad, "Locking on pts %" GST_TIME_FORMAT,
GST_TIME_ARGS (ts));
first_ts = ts;
}
@ -3351,16 +3363,21 @@ gst_ogg_demux_do_seek (GstOggDemux * ogg, GstSegment * segment,
keyframe_time =
gst_ogg_stream_granule_to_time (&pad->map, pad->keyframe_granule);
GST_LOG_OBJECT (ogg,
"stream %08x granule time %" GST_TIME_FORMAT,
pad->map.serialno, GST_TIME_ARGS (keyframe_time));
"stream %08x keyframe granule PTS %" GST_TIME_FORMAT
" target %" GST_TIME_FORMAT,
pad->map.serialno, GST_TIME_ARGS (keyframe_time),
GST_TIME_ARGS (keytarget));
/* collect smallest value */
if (keyframe_time != -1) {
keyframe_time -= pad->start_time;
keyframe_time += begintime;
if (keyframe_time < keytarget) {
serialno = pad->map.serialno;
keytarget = keyframe_time;
found_keyframe = TRUE;
GST_LOG_OBJECT (ogg, "storing keytarget %" GST_TIME_FORMAT,
GST_TIME_ARGS (keytarget));
}
}