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qtdemux: rework segment event pushing, again

Browse source 
This patch aims at fixing the recent regressions in the adaptive test
suite.

All segment pushing in push mode is now done with
gst_qtdemux_check_send_pending_segment(), which is idempotent and
handles both edit lists cases and cases where the upstream TIME segments
have to be sent directly.

Fragmented files that start with a non-zero tfdt are also taken into
account, but their handling has been vastly simplified: now they are
handled as implicit default seeks so there is no need to extend the
GstSegment formulas as was being done before.

qtdemux->segment.duration is no longer modified when
upstream_format_is_time, respecting in this way the durations provided
by dashdemux and fixing bugs in reverse playback tests where mangled
durations appeared in the emitted segments.

https://bugzilla.gnome.org/show_bug.cgi?id=752603
This commit is contained in:
Alicia Boya García 2018-06-09 23:58:01 +02:00 committed by Thibault Saunier
parent 2c394304b7
commit 025a430d08
2 changed files with 92 additions and 117 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

185
gst/isomp4/qtdemux.c
View file

@ -484,6 +484,8 @@ static GNode *qtdemux_tree_get_sibling_by_type_full (GNode * node,
static GstFlowReturn qtdemux_add_fragmented_samples (GstQTDemux * qtdemux);
static void gst_qtdemux_check_send_pending_segment (GstQTDemux * demux);
static GstStaticPadTemplate gst_qtdemux_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
@ -546,9 +548,6 @@ static void gst_qtdemux_stream_check_and_change_stsd_index (GstQTDemux * demux,
QtDemuxStream * stream);
static GstFlowReturn gst_qtdemux_process_adapter (GstQTDemux * demux,
gboolean force);
static GstClockTime gst_qtdemux_streams_get_first_sample_ts (GstQTDemux *
demux);
static GstClockTime gst_qtdemux_streams_have_samples (GstQTDemux * demux);
static gboolean qtdemux_parse_moov (GstQTDemux * qtdemux,
const guint8 * buffer, guint length);
@ -1033,38 +1032,6 @@ gst_qtdemux_push_event (GstQTDemux * qtdemux, GstEvent * event)
}
}
/* push a pending newsegment event, if any from the streaming thread */
static void
gst_qtdemux_push_pending_newsegment (GstQTDemux * qtdemux)
{
if (G_UNLIKELY (qtdemux->need_segment)) {
GstEvent *newsegment;
if (!qtdemux->upstream_format_is_time) {
GstClockTime min_ts;
if (!gst_qtdemux_streams_have_samples (qtdemux)) {
/* No samples yet, can't decide on segment.start */
GST_DEBUG_OBJECT (qtdemux, "No samples yet, postponing segment event");
return;
}
min_ts = gst_qtdemux_streams_get_first_sample_ts (qtdemux);
/* have_samples() above should guarantee we have a valid time */
g_assert (GST_CLOCK_TIME_IS_VALID (min_ts));
qtdemux->segment.start = min_ts;
}
newsegment = gst_event_new_segment (&qtdemux->segment);
if (qtdemux->segment_seqnum != GST_SEQNUM_INVALID)
gst_event_set_seqnum (newsegment, qtdemux->segment_seqnum);
qtdemux->need_segment = FALSE;
gst_qtdemux_push_event (qtdemux, newsegment);
}
}
typedef struct
{
guint64 media_time;
@ -1791,6 +1758,8 @@ gst_qtdemux_handle_src_event (GstPad * pad, GstObject * parent,
#endif
guint32 seqnum = gst_event_get_seqnum (event);
qtdemux->received_seek = TRUE;
if (seqnum == qtdemux->segment_seqnum) {
GST_LOG_OBJECT (pad,
"Drop duplicated SEEK event seqnum %" G_GUINT32_FORMAT, seqnum);
@ -2171,6 +2140,9 @@ gst_qtdemux_reset (GstQTDemux * qtdemux, gboolean hard)
g_queue_foreach (&qtdemux->protection_event_queue, (GFunc) gst_event_unref,
NULL);
g_queue_clear (&qtdemux->protection_event_queue);
qtdemux->received_seek = FALSE;
qtdemux->first_moof_already_parsed = FALSE;
}
qtdemux->offset = 0;
gst_adapter_clear (qtdemux->adapter);
@ -2368,19 +2340,8 @@ gst_qtdemux_handle_sink_event (GstPad * sinkpad, GstObject * parent,
/* map segment to internal qt segments and push on each stream */
if (demux->n_streams) {
if (demux->fragmented) {
GstEvent *segment_event = gst_event_new_segment (&segment);
if (demux->segment_seqnum != GST_SEQNUM_INVALID)
gst_event_set_seqnum (segment_event, demux->segment_seqnum);
gst_qtdemux_push_event (demux, segment_event);
} else {
gst_qtdemux_map_and_push_segments (demux, &segment);
}
/* keep need-segment as is in case this is the segment before
* fragmented data, we might not have pads yet to push it */
if (demux->exposed)
demux->need_segment = FALSE;
demux->need_segment = TRUE;
gst_qtdemux_check_send_pending_segment (demux);
}
/* clear leftover in current segment, if any */
@ -3993,6 +3954,7 @@ qtdemux_parse_moof (GstQTDemux * qtdemux, const guint8 * buffer, guint length,
guint32 ds_size = 0, ds_duration = 0, ds_flags = 0;
gint64 base_offset, running_offset;
guint32 frag_num;
GstClockTime min_dts = GST_CLOCK_TIME_NONE;
/* NOTE @stream ignored */
@ -4113,6 +4075,8 @@ qtdemux_parse_moof (GstQTDemux * qtdemux, const guint8 * buffer, guint length,
if (G_UNLIKELY (base_offset < -1))
goto lost_offset;
min_dts = MIN (min_dts, QTSTREAMTIME_TO_GSTTIME (stream, decode_time));
if (qtdemux->upstream_format_is_time)
gst_qtdemux_stream_flush_samples_data (stream);
@ -4163,6 +4127,38 @@ qtdemux_parse_moof (GstQTDemux * qtdemux, const guint8 * buffer, guint length,
pssh_node = qtdemux_tree_get_sibling_by_type (pssh_node, FOURCC_pssh);
}
if (!qtdemux->upstream_format_is_time && !qtdemux->first_moof_already_parsed
&& !qtdemux->received_seek && GST_CLOCK_TIME_IS_VALID (min_dts)
&& min_dts != 0) {
/* Unless the user has explictly requested another seek, perform an
* internal seek to the time specified in the tfdt.
*
* This way if the user opens a file where the first tfdt is 1 hour
* into the presentation, they will not have to wait 1 hour for run
* time to catch up and actual playback to start. */
GList *iter;
GST_DEBUG_OBJECT (qtdemux, "First fragment has a non-zero tfdt, "
"performing an internal seek to %" GST_TIME_FORMAT,
GST_TIME_ARGS (min_dts));
qtdemux->segment.start = min_dts;
qtdemux->segment.time = qtdemux->segment.position = min_dts;
for (iter = qtdemux->active_streams; iter; iter = g_list_next (iter)) {
QtDemuxStream *stream = QTDEMUX_STREAM (iter->data);
stream->time_position = min_dts;
}
/* Before this code was run a segment was already sent when the moov was
* parsed... which is OK -- some apps (mostly tests) expect a segment to
* be emitted after a moov, and we can emit a second segment anyway for
* special cases like this. */
qtdemux->need_segment = TRUE;
}
qtdemux->first_moof_already_parsed = TRUE;
g_node_destroy (moof_node);
return TRUE;
@ -4531,11 +4527,6 @@ gst_qtdemux_loop_state_header (GstQTDemux * qtdemux)
gst_buffer_unmap (moov, &map);
gst_buffer_unref (moov);
qtdemux->got_moov = TRUE;
if (!qtdemux->fragmented && !qtdemux->upstream_format_is_time) {
/* in this case, parsing the edts entries will give us segments
already */
qtdemux->need_segment = FALSE;
}
break;
}
@ -4873,7 +4864,6 @@ gst_qtdemux_stream_update_segment (GstQTDemux * qtdemux, QtDemuxStream * stream,
{
QtDemuxSegment *segment;
GstClockTime start = 0, stop = GST_CLOCK_TIME_NONE, time = 0;
GstClockTime min_ts;
gdouble rate;
GstEvent *event;
@ -4912,22 +4902,17 @@ gst_qtdemux_stream_update_segment (GstQTDemux * qtdemux, QtDemuxStream * stream,
/* Copy flags from main segment */
stream->segment.flags = qtdemux->segment.flags;
/* need to offset with the start time of the first sample */
min_ts = gst_qtdemux_streams_get_first_sample_ts (qtdemux);
/* update the segment values used for clipping */
stream->segment.offset = qtdemux->segment.offset;
stream->segment.base = qtdemux->segment.base + stream->accumulated_base;
stream->segment.applied_rate = qtdemux->segment.applied_rate;
stream->segment.rate = rate;
stream->segment.start = start + QTSTREAMTIME_TO_GSTTIME (stream,
stream->cslg_shift) + min_ts;
if (GST_CLOCK_TIME_IS_VALID (stop)) {
stream->cslg_shift);
stream->segment.stop = stop + QTSTREAMTIME_TO_GSTTIME (stream,
stream->cslg_shift) + min_ts;
}
stream->segment.time = time + min_ts;
stream->segment.position = stream->segment.start + min_ts;
stream->cslg_shift);
stream->segment.time = time;
stream->segment.position = stream->segment.start;
GST_DEBUG_OBJECT (stream->pad, "New segment: %" GST_SEGMENT_FORMAT,
&stream->segment);
@ -6016,8 +6001,6 @@ gst_qtdemux_loop_state_movie (GstQTDemux * qtdemux)
guint size;
GList *iter;
gst_qtdemux_push_pending_newsegment (qtdemux);
if (qtdemux->fragmented_seek_pending) {
GST_INFO_OBJECT (qtdemux, "pending fragmented seek");
if (gst_qtdemux_do_fragmented_seek (qtdemux)) {
@ -6550,6 +6533,7 @@ gst_qtdemux_drop_data (GstQTDemux * demux, gint bytes)
demux->todrop -= bytes;
}
/* PUSH-MODE only: Send a segment, if not done already. */
static void
gst_qtdemux_check_send_pending_segment (GstQTDemux * demux)
{
@ -6557,7 +6541,18 @@ gst_qtdemux_check_send_pending_segment (GstQTDemux * demux)
gint i;
GList *iter;
gst_qtdemux_push_pending_newsegment (demux);
if (!demux->upstream_format_is_time) {
gst_qtdemux_map_and_push_segments (demux, &demux->segment);
} else {
GstEvent *segment_event;
segment_event = gst_event_new_segment (&demux->segment);
if (demux->segment_seqnum != GST_SEQNUM_INVALID)
gst_event_set_seqnum (segment_event, demux->segment_seqnum);
gst_qtdemux_push_event (demux, segment_event);
}
demux->need_segment = FALSE;
/* clear to send tags on all streams */
for (iter = demux->active_streams, i = 0; iter;
iter = g_list_next (iter), i++) {
@ -6598,35 +6593,6 @@ gst_qtdemux_send_gap_for_segment (GstQTDemux * demux,
}
}
static GstClockTime
gst_qtdemux_streams_get_first_sample_ts (GstQTDemux * demux)
{
GstClockTime res = GST_CLOCK_TIME_NONE;
GList *iter;
for (iter = demux->active_streams; iter; iter = g_list_next (iter)) {
QtDemuxStream *stream = QTDEMUX_STREAM (iter->data);
if (stream->n_samples) {
res = MIN (QTSAMPLE_PTS (stream, &stream->samples[0]), res);
res = MIN (QTSAMPLE_DTS (stream, &stream->samples[0]), res);
}
}
return res;
}
static GstClockTime
gst_qtdemux_streams_have_samples (GstQTDemux * demux)
{
GList *iter;
for (iter = demux->active_streams; iter; iter = g_list_next (iter)) {
QtDemuxStream *stream = QTDEMUX_STREAM (iter->data);
if (stream->n_samples)
return TRUE;
}
return FALSE;
}
static GstFlowReturn
gst_qtdemux_chain (GstPad * sinkpad, GstObject * parent, GstBuffer * inbuf)
{
@ -6904,19 +6870,8 @@ gst_qtdemux_process_adapter (GstQTDemux * demux, gboolean force)
QTDEMUX_EXPOSE_UNLOCK (demux);
demux->got_moov = TRUE;
demux->need_segment = TRUE;
/* Forward upstream driven time format segment, and also do not try
* to map edit list with the upstream time format segment.
* It's upstream element's role (the origin of time format segment)
*/
if (demux->upstream_format_is_time)
gst_qtdemux_check_send_pending_segment (demux);
else
gst_qtdemux_map_and_push_segments (demux, &demux->segment);
if (demux->exposed)
demux->need_segment = FALSE;
if (demux->moov_node_compressed) {
g_node_destroy (demux->moov_node_compressed);
@ -9566,14 +9521,15 @@ qtdemux_parse_segments (GstQTDemux * qtdemux, QtDemuxStream * stream,
GST_TIME_ARGS (segment->media_stop),
GST_TIME_ARGS (segment->stop_time), segment->rate, rate_int,
stream->timescale);
if (segment->stop_time > qtdemux->segment.stop) {
if (segment->stop_time > qtdemux->segment.stop &&
!qtdemux->upstream_format_is_time) {
GST_WARNING_OBJECT (qtdemux, "Segment %d "
" extends to %" GST_TIME_FORMAT
" past the end of the file duration %" GST_TIME_FORMAT
" it will be truncated", segment_number,
" past the end of the declared movie duration %" GST_TIME_FORMAT
" movie segment will be extended", segment_number,
GST_TIME_ARGS (segment->stop_time),
GST_TIME_ARGS (qtdemux->segment.stop));
qtdemux->segment.stop = segment->stop_time;
qtdemux->segment.stop = qtdemux->segment.duration = segment->stop_time;
}
buffer += entry_size;
@ -12517,6 +12473,8 @@ qtdemux_expose_streams (GstQTDemux * qtdemux)
qtdemux_do_allocation (qtdemux, QTDEMUX_STREAM (iter->data));
}
qtdemux->need_segment = TRUE;
qtdemux->exposed = TRUE;
return GST_FLOW_OK;
}
@ -13705,7 +13663,6 @@ qtdemux_parse_tree (GstQTDemux * qtdemux)
GNode *trak;
GNode *udta;
GNode *mvex;
GstClockTime duration;
GNode *pssh;
guint64 creation_time;
GstDateTime *datetime = NULL;
@ -13785,9 +13742,13 @@ qtdemux_parse_tree (GstQTDemux * qtdemux)
qtdemux_parse_mehd (qtdemux, &mehd_data);
}
/* Update the movie segment duration, unless it was directly given to us
* by upstream. Otherwise let it as is, as we don't want to mangle the
* duration provided by upstream that may come e.g. from a MPD file. */
if (!qtdemux->upstream_format_is_time) {
GstClockTime duration;
/* set duration in the segment info */
gst_qtdemux_get_duration (qtdemux, &duration);
if (duration) {
qtdemux->segment.duration = duration;
/* also do not exceed duration; stop is set that way post seek anyway,
* and segment activation falls back to duration,

16
gst/isomp4/qtdemux.h
View file

@ -119,7 +119,10 @@ struct _GstQTDemux {
/* configured playback region */
GstSegment segment;
/* If a segment event needs to be pushed */
/* 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
* point we may not have yet emitted the srcpads. */
gboolean need_segment;
guint32 segment_seqnum;
@ -237,6 +240,17 @@ struct _GstQTDemux {
* header start.
* Note : This is not computed from the GST_BUFFER_OFFSET field */
guint64 fragment_start_offset;
/* These two fields are used to perform an implicit seek when a fragmented
* file whose first tfdt is not zero. This way if the first fragment starts
* at 1 hour, the user does not have to wait 1 hour or perform a manual seek
* for the image to move and the sound to play.
*
* This implicit seek is only done if the first parsed fragment has a non-zero
* decode base time and a seek has not been received previously, hence these
* fields. */
gboolean received_seek;
gboolean first_moof_already_parsed;
};
struct _GstQTDemuxClass {