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qtmux: replace _scale with _scale_round

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Use the rounding version for improved sync between streams.
Small variations in the duration when muxing might lead to
cumullative wrong timestamping when demuxing.

Fixes #602936
This commit is contained in:
Thiago Santos 2009-11-25 21:41:27 -03:00
parent 379931cc6e
commit b343536de0
1 changed files with 5 additions and 5 deletions
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10
gst/qtmux/gstqtmux.c
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@ -1326,7 +1326,7 @@ gst_qt_mux_add_buffer (GstQTMux * qtmux, GstQTPad * pad, GstBuffer * buf)
gst_buffer_replace (&pad->last_buf, buf);
last_dts = gst_util_uint64_scale (pad->last_dts,
last_dts = gst_util_uint64_scale_round (pad->last_dts,
atom_trak_get_timescale (pad->trak), GST_SECOND);
/* raw audio has many samples per buffer (= chunk) */
@ -1348,10 +1348,10 @@ gst_qt_mux_add_buffer (GstQTMux * qtmux, GstQTPad * pad, GstBuffer * buf)
gint64 scaled_dts;
pad->last_dts = GST_BUFFER_OFFSET_END (last_buf);
if ((gint64) (pad->last_dts) < 0) {
scaled_dts = -gst_util_uint64_scale (-pad->last_dts,
scaled_dts = -gst_util_uint64_scale_round (-pad->last_dts,
atom_trak_get_timescale (pad->trak), GST_SECOND);
} else {
scaled_dts = gst_util_uint64_scale (pad->last_dts,
scaled_dts = gst_util_uint64_scale_round (pad->last_dts,
atom_trak_get_timescale (pad->trak), GST_SECOND);
}
scaled_duration = scaled_dts - last_dts;
@ -1361,7 +1361,7 @@ gst_qt_mux_add_buffer (GstQTMux * qtmux, GstQTPad * pad, GstBuffer * buf)
* trak timescale, then derive delta;
* this ensures sums of (scale)delta add up to converted timestamp,
* which only deviates at most 1/scale from timestamp itself */
scaled_duration = gst_util_uint64_scale (pad->last_dts + duration,
scaled_duration = gst_util_uint64_scale_round (pad->last_dts + duration,
atom_trak_get_timescale (pad->trak), GST_SECOND) - last_dts;
pad->last_dts += duration;
}
@ -1396,7 +1396,7 @@ gst_qt_mux_add_buffer (GstQTMux * qtmux, GstQTPad * pad, GstBuffer * buf)
if ((pad->have_dts || qtmux->guess_pts) && pad->is_out_of_order) {
guint64 pts;
pts = gst_util_uint64_scale (GST_BUFFER_TIMESTAMP (last_buf),
pts = gst_util_uint64_scale_round (GST_BUFFER_TIMESTAMP (last_buf),
atom_trak_get_timescale (pad->trak), GST_SECOND);
pts_offset = (gint64) (pts - last_dts);
do_pts = TRUE;