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v4lsrc: fix timestamping for when we do not have a clock yet

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Should fix #559049.
This commit is contained in:
Tim-Philipp Müller 2009-09-01 15:02:37 +01:00
parent e2e5a1da06
commit 95af14d7bc
1 changed files with 33 additions and 10 deletions
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43
sys/v4l/v4lsrc_calls.c
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@ -705,9 +705,10 @@ gst_v4lsrc_buffer_finalize (GstV4lSrcBuffer * v4lsrc_buffer)
GstBuffer *
gst_v4lsrc_buffer_new (GstV4lSrc * v4lsrc, gint num)
{
GstBuffer *buf;
gint fps_n, fps_d;
GstClockTime duration, timestamp, latency;
GstBuffer *buf;
GstClock *clock;
gint fps_n, fps_d;
GST_DEBUG_OBJECT (v4lsrc, "creating buffer for frame %d", num);
@ -723,16 +724,38 @@ gst_v4lsrc_buffer_new (GstV4lSrc * v4lsrc, gint num)
GST_BUFFER_DATA (buf) = gst_v4lsrc_get_buffer (v4lsrc, num);
GST_BUFFER_SIZE (buf) = v4lsrc->buffer_size;
GST_BUFFER_OFFSET (buf) = v4lsrc->offset++;
GST_BUFFER_OFFSET_END (buf) = v4lsrc->offset;
duration = gst_util_uint64_scale_int (GST_SECOND, fps_d, fps_n);
latency = duration;
/* timestamps, LOCK to get clock and base time. */
GST_OBJECT_LOCK (v4lsrc);
if ((clock = GST_ELEMENT_CLOCK (v4lsrc))) {
/* we have a clock, get base time and ref clock */
timestamp = GST_ELEMENT_CAST (v4lsrc)->base_time;
gst_object_ref (clock);
} else {
/* no clock, can't set timestamps */
timestamp = GST_CLOCK_TIME_NONE;
}
GST_OBJECT_UNLOCK (v4lsrc);
timestamp = gst_clock_get_time (GST_ELEMENT_CAST (v4lsrc)->clock);
timestamp -= gst_element_get_base_time (GST_ELEMENT_CAST (v4lsrc));
if (timestamp > latency)
timestamp -= latency;
else
timestamp = 0;
duration =
gst_util_uint64_scale_int (GST_SECOND, fps_d * v4lsrc->offset, fps_n) -
gst_util_uint64_scale_int (GST_SECOND, fps_d * (v4lsrc->offset - 1),
fps_n);
latency = gst_util_uint64_scale_int (GST_SECOND, fps_d, fps_n);
if (clock) {
/* the time now is the time of the clock minus the base time */
timestamp = gst_clock_get_time (clock) - timestamp;
gst_object_unref (clock);
/* adjust timestamp for frame latency (we assume we have a framerate) */
if (timestamp > latency)
timestamp -= latency;
else
timestamp = 0;
}
GST_BUFFER_TIMESTAMP (buf) = timestamp;
GST_BUFFER_DURATION (buf) = duration;