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segment: add option to disable clipping

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Add a clip argument to gst_segment_to_running_time_full() to disable
the checks against the segment boundaries. This makes it possible to
generate an extrapolated running-time for timestamps outside of the
segment.

See https://bugzilla.gnome.org/show_bug.cgi?id=740575
This commit is contained in:
Wim Taymans 2015-03-19 17:36:36 +01:00
parent 1734915850
commit edf484ab6b
3 changed files with 34 additions and 24 deletions
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44
gst/gstsegment.c
View file

@ -457,24 +457,28 @@ gst_segment_to_stream_time (const GstSegment * segment, GstFormat format,
* @segment: a #GstSegment structure.
* @format: the format of the segment.
* @position: the position in the segment
* @clip: clip against segment boundaries
* @running_time: result running-time
*
* Translate @position to the total running time using the currently configured
* segment. Position is a value between @segment start and stop time. Compared to
* gst_segment_to_running_time() this function can return negative running-time
* and specify if the position was before or after the segment incase it is outside
* of the segment.
* segment. Compared to gst_segment_to_running_time() this function can return
* negative running-time and also check if a @position is before or after the
* segment.
*
* This function is typically used by elements that need to synchronize buffers
* against the clock or eachother.
*
* When #GST_SEGMENT_RESULT_OK is returned, @position is between start and stop of
* @segment and thus resulted in a positive running-time returned in @running_time.
*
* If clip is %TRUE, @position is a value between @segment start and stop.
* When @position is outside of the segment start and stop values,
* #GST_SEGMENT_RESULT_BEFORE or #GST_SEGMENT_RESULT_AFTER is returned depending
* if @position is respectively before or after the segment.
*
* If clip is %FALSE, @position can be any value and the result of this function
* for values outside of the segment is extrapolated.
*
* When #GST_SEGMENT_RESULT_OK is returned, @position resulted in a positive
* running-time returned in @running_time.
*
* When this function returns #GST_SEGMENT_RESULT_NEGATIVE, the returned
* @running_time should be negated to get the real negative running time.
*
@ -484,7 +488,7 @@ gst_segment_to_stream_time (const GstSegment * segment, GstFormat format,
*/
GstSegmentResult
gst_segment_to_running_time_full (const GstSegment * segment, GstFormat format,
guint64 position, guint64 * running_time)
guint64 position, gboolean clip, guint64 * running_time)
{
GstSegmentResult res;
guint64 result;
@ -502,7 +506,7 @@ gst_segment_to_running_time_full (const GstSegment * segment, GstFormat format,
start = segment->start;
/* before the segment boundary */
if (G_UNLIKELY (position < start)) {
if (clip && G_UNLIKELY (position < start)) {
GST_DEBUG ("position(%" G_GUINT64_FORMAT ") < start(%" G_GUINT64_FORMAT
")", position, start);
if (G_LIKELY (segment->rate > 0.0))
@ -514,7 +518,7 @@ gst_segment_to_running_time_full (const GstSegment * segment, GstFormat format,
stop = segment->stop;
/* after the segment boundary */
if (G_UNLIKELY (stop != -1 && position > stop)) {
if (clip && G_UNLIKELY (stop != -1 && position > stop)) {
GST_DEBUG ("position(%" G_GUINT64_FORMAT ") > stop(%" G_GUINT64_FORMAT
")", position, stop);
if (G_LIKELY (segment->rate > 0.0))
@ -527,13 +531,15 @@ gst_segment_to_running_time_full (const GstSegment * segment, GstFormat format,
offset = segment->offset;
if (G_LIKELY (segment->rate > 0.0)) {
start += offset;
/* bring to uncorrected position in segment */
if (position < start + offset) {
if (position < start) {
/* negative value */
result = (start + offset) - position;
result = start - position;
res = GST_SEGMENT_RESULT_NEGATIVE;
} else {
result = position - (start + offset);
result = position - start;
res = GST_SEGMENT_RESULT_OK;
}
} else {
@ -541,13 +547,15 @@ gst_segment_to_running_time_full (const GstSegment * segment, GstFormat format,
g_return_val_if_fail (stop != -1, GST_SEGMENT_RESULT_INVALID);
g_return_val_if_fail (stop >= segment->offset, GST_SEGMENT_RESULT_INVALID);
stop -= offset;
/* bring to uncorrected position in segment */
if (position > stop - offset) {
if (position > stop) {
/* negative value */
result = position - (stop - offset);
result = position - stop;
res = GST_SEGMENT_RESULT_NEGATIVE;
} else {
result = (stop - offset) - position;
result = stop - position;
res = GST_SEGMENT_RESULT_OK;
}
}
@ -610,7 +618,9 @@ gst_segment_to_running_time (const GstSegment * segment, GstFormat format,
guint64 result;
GstSegmentResult res;
res = gst_segment_to_running_time_full (segment, format, position, &result);
res =
gst_segment_to_running_time_full (segment, format, position, TRUE,
&result);
if (res == GST_SEGMENT_RESULT_OK)
return result;

2
gst/gstsegment.h
View file

@ -240,7 +240,7 @@ guint64 gst_segment_to_stream_time (const GstSegment *segment, GstForm
guint64 gst_segment_to_running_time (const GstSegment *segment, GstFormat format, guint64 position);
GstSegmentResult
gst_segment_to_running_time_full (const GstSegment *segment, GstFormat format, guint64 position,
guint64 * running_time);
gboolean clip, guint64 * running_time);
guint64 gst_segment_to_position (const GstSegment *segment, GstFormat format, guint64 running_time);
gboolean gst_segment_set_running_time (GstSegment *segment, GstFormat format, guint64 running_time);

12
tests/check/gst/gstsegment.c
View file

@ -762,24 +762,24 @@ GST_START_TEST (segment_full)
check_times (&segment, 220, -1, -1);
fail_unless (gst_segment_to_running_time_full (&segment, GST_FORMAT_TIME,
50, &rt) == GST_SEGMENT_RESULT_OK);
50, TRUE, &rt) == GST_SEGMENT_RESULT_OK);
fail_unless (rt == 0);
fail_unless (gst_segment_to_running_time_full (&segment, GST_FORMAT_TIME,
200, &rt) == GST_SEGMENT_RESULT_OK);
200, TRUE, &rt) == GST_SEGMENT_RESULT_OK);
fail_unless (rt == 150);
fail_unless (gst_segment_to_running_time_full (&segment, GST_FORMAT_TIME,
40, &rt) == GST_SEGMENT_RESULT_BEFORE);
40, TRUE, &rt) == GST_SEGMENT_RESULT_BEFORE);
fail_unless (gst_segment_to_running_time_full (&segment, GST_FORMAT_TIME,
49, &rt) == GST_SEGMENT_RESULT_BEFORE);
49, TRUE, &rt) == GST_SEGMENT_RESULT_BEFORE);
fail_unless (gst_segment_to_running_time_full (&segment, GST_FORMAT_TIME,
201, &rt) == GST_SEGMENT_RESULT_AFTER);
201, TRUE, &rt) == GST_SEGMENT_RESULT_AFTER);
fail_unless (gst_segment_offset_running_time (&segment, GST_FORMAT_TIME,
-50) == TRUE);
fail_unless (segment.offset == 50);
fail_unless (gst_segment_to_running_time_full (&segment, GST_FORMAT_TIME,
50, &rt) == GST_SEGMENT_RESULT_NEGATIVE);
50, TRUE, &rt) == GST_SEGMENT_RESULT_NEGATIVE);
GST_DEBUG ("%" G_GUINT64_FORMAT, rt);
fail_unless (rt == 50);
}