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qtdemux: use track fragment decoding time (tfdt) in parse_trun() for interpolation

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As fallback if we don't have any existing samples
as reference point yet.

Based on patch by David Corvoysier <david.corvoysier@orange.com>
This commit is contained in:
Tim-Philipp Müller 2014-11-29 15:25:51 +00:00
parent e24f903b13
commit 77f37a6b22
1 changed files with 24 additions and 10 deletions
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32
gst/isomp4/qtdemux.c
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@ -2445,8 +2445,9 @@ static gboolean
qtdemux_parse_trun (GstQTDemux * qtdemux, GstByteReader * trun,
QtDemuxStream * stream, guint32 d_sample_duration, guint32 d_sample_size,
guint32 d_sample_flags, gint64 moof_offset, gint64 moof_length,
gint64 * base_offset, gint64 * running_offset)
gint64 * base_offset, gint64 * running_offset, gint64 decode_ts)
{
GstClockTime gst_ts;
guint64 timestamp;
gint32 data_offset = 0;
guint32 flags = 0, first_flags = 0, samples_count = 0;
@ -2457,9 +2458,9 @@ qtdemux_parse_trun (GstQTDemux * qtdemux, GstByteReader * trun,
gboolean ismv = FALSE;
GST_LOG_OBJECT (qtdemux, "parsing trun stream %d; "
"default dur %d, size %d, flags 0x%x, base offset %" G_GINT64_FORMAT,
stream->track_id, d_sample_duration, d_sample_size, d_sample_flags,
*base_offset);
"default dur %d, size %d, flags 0x%x, base offset %" G_GINT64_FORMAT ", "
"decode ts %" G_GINT64_FORMAT, stream->track_id, d_sample_duration,
d_sample_size, d_sample_flags, *base_offset, decode_ts);
/* presence of stss or not can't really tell us much,
* and flags and so on tend to be marginally reliable in these files */
@ -2572,12 +2573,24 @@ qtdemux_parse_trun (GstQTDemux * qtdemux, GstByteReader * trun,
if (G_UNLIKELY (stream->n_samples == 0)) {
/* the timestamp of the first sample is also provided by the tfra entry
* but we shouldn't rely on it as it is at the end of files */
if (decode_ts >= 0) {
timestamp = decode_ts;
} else {
timestamp = 0;
}
gst_ts = gst_util_uint64_scale (timestamp, GST_SECOND, stream->timescale);
GST_INFO_OBJECT (stream->pad, "first sample ts %" GST_TIME_FORMAT,
GST_TIME_ARGS (gst_ts));
} else {
/* subsequent fragments extend stream */
timestamp =
stream->samples[stream->n_samples - 1].timestamp +
stream->samples[stream->n_samples - 1].duration;
gst_ts = gst_util_uint64_scale (timestamp, GST_SECOND, stream->timescale);
GST_INFO_OBJECT (qtdemux, "first sample ts %" GST_TIME_FORMAT
" (extends previous samples)", GST_TIME_ARGS (gst_ts));
}
}
sample = stream->samples + stream->n_samples;
@ -2822,6 +2835,8 @@ qtdemux_parse_moof (GstQTDemux * qtdemux, const guint8 * buffer, guint length,
base_offset = running_offset = -1;
traf_node = qtdemux_tree_get_child_by_type (moof_node, FOURCC_traf);
while (traf_node) {
guint64 decode_time = 0;
/* Fragment Header node */
tfhd_node =
qtdemux_tree_get_child_by_type_full (traf_node, FOURCC_tfhd,
@ -2835,17 +2850,16 @@ qtdemux_parse_moof (GstQTDemux * qtdemux, const guint8 * buffer, guint length,
qtdemux_tree_get_child_by_type_full (traf_node, FOURCC_tfdt,
&tfdt_data);
if (tfdt_node) {
guint64 decode_time = 0;
GstClockTime decode_time_ts;
/* We'll use decode_time to interpolate timestamps
* in case the input timestamps are missing */
qtdemux_parse_tfdt (qtdemux, &tfdt_data, &decode_time);
/* FIXME, we can use decode_time to interpolate timestamps
* in case the input timestamps are missing */
decode_time_ts = gst_util_uint64_scale (decode_time, GST_SECOND,
stream->timescale);
GST_DEBUG_OBJECT (qtdemux, "decode time %" G_GUINT64_FORMAT
GST_DEBUG_OBJECT (qtdemux, "decode time %" G_GINT64_FORMAT
" (%" GST_TIME_FORMAT ")", decode_time,
GST_TIME_ARGS (decode_time_ts));
}
@ -2865,7 +2879,7 @@ qtdemux_parse_moof (GstQTDemux * qtdemux, const guint8 * buffer, guint length,
while (trun_node) {
qtdemux_parse_trun (qtdemux, &trun_data, stream,
ds_duration, ds_size, ds_flags, moof_offset, length, &base_offset,
&running_offset);
&running_offset, decode_time);
/* iterate all siblings */
trun_node = qtdemux_tree_get_sibling_by_type_full (trun_node, FOURCC_trun,
&trun_data);