*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
*/
#include "gst_private.h"
* For elements that need to perform operations on media data in stream_time,
* gst_segment_to_stream_time() can be used to convert a timestamp and the segment
* info to stream time (which is always between 0 and the duration of the stream).
- *
- * Last reviewed on 2012-03-29 (0.11.3)
*/
/**
* @segment: a #GstSegment structure.
* @format: the format of the segment.
*
- * The start/last_stop positions are set to 0 and the stop/duration
+ * The start/position fields are set to 0 and the stop/duration
* fields are set to -1 (unknown). The default rate of 1.0 and no
* flags are set.
*
* If the caller can apply a rate change, it should update @segment
* rate and applied_rate after calling this function.
*
- * @update will be set to TRUE if a seek should be performed to the segment
- * position field. This field can be FALSE if, for example, only the @rate
+ * @update will be set to %TRUE if a seek should be performed to the segment
+ * position field. This field can be %FALSE if, for example, only the @rate
* has been changed but not the playback position.
*
* Returns: %TRUE if the seek could be performed.
if (segment->duration != -1)
start = MIN (start, segment->duration);
else
- start = MAX (start, 0);
+ start = MAX ((gint64) start, 0);
/* stop can be -1 if we have not configured a stop. */
switch (stop_type) {
/* if we have a valid stop time, make sure it is clipped */
if (stop != -1) {
if (segment->duration != -1)
- stop = CLAMP (stop, 0, segment->duration);
+ stop = CLAMP ((gint64) stop, 0, (gint64) segment->duration);
else
- stop = MAX (stop, 0);
+ stop = MAX ((gint64) stop, 0);
}
/* we can't have stop before start */
if (stop != -1) {
if (start > stop) {
+ GST_WARNING ("segment update failed: start(%" G_GUINT64_FORMAT
+ ") > stop(%" G_GUINT64_FORMAT ")", start, stop);
g_return_val_if_fail (start <= stop, FALSE);
return FALSE;
}
/* flush resets the running_time */
base = 0;
} else {
+ /* make sure the position is inside the segment start/stop */
+ position = CLAMP (position, segment->start, segment->stop);
+
/* remember the elapsed time */
base = gst_segment_to_running_time (segment, format, position);
+ GST_DEBUG ("updated segment.base: %" G_GUINT64_FORMAT, base);
}
if (update_start && rate > 0.0) {
segment->flags = GST_SEGMENT_FLAG_NONE;
if ((flags & GST_SEEK_FLAG_FLUSH) != 0)
segment->flags |= GST_SEGMENT_FLAG_RESET;
- if ((flags & GST_SEEK_FLAG_SKIP) != 0)
- segment->flags |= GST_SEGMENT_FLAG_SKIP;
+ if ((flags & GST_SEEK_FLAG_TRICKMODE) != 0)
+ segment->flags |= GST_SEGMENT_FLAG_TRICKMODE;
if ((flags & GST_SEEK_FLAG_SEGMENT) != 0)
segment->flags |= GST_SEGMENT_FLAG_SEGMENT;
+ if ((flags & GST_SEEK_FLAG_TRICKMODE_KEY_UNITS) != 0)
+ segment->flags |= GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS;
+ if ((flags & GST_SEEK_FLAG_TRICKMODE_NO_AUDIO) != 0)
+ segment->flags |= GST_SEGMENT_FLAG_TRICKMODE_NO_AUDIO;
segment->rate = rate;
segment->applied_rate = 1.0;
segment->time = start;
segment->position = position;
+ GST_INFO ("segment updated: %" GST_SEGMENT_FORMAT, segment);
+
return TRUE;
}
gst_segment_to_stream_time (const GstSegment * segment, GstFormat format,
guint64 position)
{
- guint64 result, start, stop, time;
+ guint64 stream_time, start, stop, time;
gdouble abs_applied_rate;
/* format does not matter for -1 */
if (G_UNLIKELY (time == -1))
return -1;
- /* bring to uncorrected position in segment */
- result = position - start;
-
abs_applied_rate = ABS (segment->applied_rate);
- /* correct for applied rate if needed */
- if (G_UNLIKELY (abs_applied_rate != 1.0))
- result *= abs_applied_rate;
-
/* add or subtract from segment time based on applied rate */
if (G_LIKELY (segment->applied_rate > 0.0)) {
+ if (G_UNLIKELY (position < start))
+ return -1;
+ /* bring to uncorrected position in segment */
+ stream_time = position - start;
+ /* correct for applied rate if needed */
+ if (G_UNLIKELY (abs_applied_rate != 1.0))
+ stream_time *= abs_applied_rate;
/* correct for segment time */
- result += time;
+ stream_time += time;
} else {
/* correct for segment time, clamp at 0. Streams with a negative
* applied_rate have timestamps between start and stop, as usual, but have
* the time member starting high and going backwards. */
- if (G_LIKELY (time > result))
- result = time - result;
- else
- result = 0;
+ if (G_UNLIKELY (position > stop))
+ return -1;
+ stream_time = stop - position;
+ if (G_UNLIKELY (abs_applied_rate != 1.0))
+ stream_time *= abs_applied_rate;
+ stream_time += time;
}
- return result;
+ return stream_time;
+}
+
+/**
+ * gst_segment_to_running_time_full:
+ * @segment: a #GstSegment structure.
+ * @format: the format of the segment.
+ * @position: the position in the segment
+ * @running_time: result running-time
+ *
+ * Translate @position to the total running time using the currently configured
+ * segment. Compared to gst_segment_to_running_time() this function can return
+ * negative running-time.
+ *
+ * This function is typically used by elements that need to synchronize buffers
+ * against the clock or eachother.
+ *
+ * @position can be any value and the result of this function for values outside
+ * of the segment is extrapolated.
+ *
+ * When 1 is returned, @position resulted in a positive running-time returned
+ * in @running_time.
+ *
+ * When this function returns -1, the returned @running_time should be negated
+ * to get the real negative running time.
+ *
+ * Returns: a 1 or -1 on success, 0 on failure.
+ *
+ * Since: 1.6
+ */
+gint
+gst_segment_to_running_time_full (const GstSegment * segment, GstFormat format,
+ guint64 position, guint64 * running_time)
+{
+ gint res = 0;
+ guint64 result;
+ guint64 start, stop, offset;
+ gdouble abs_rate;
+
+ if (G_UNLIKELY (position == -1)) {
+ GST_DEBUG ("invalid position (-1)");
+ goto done;
+ }
+
+ g_return_val_if_fail (segment != NULL, 0);
+ g_return_val_if_fail (segment->format == format, 0);
+
+ offset = segment->offset;
+
+ if (G_LIKELY (segment->rate > 0.0)) {
+ start = segment->start + offset;
+
+ /* bring to uncorrected position in segment */
+ if (position < start) {
+ /* negative value */
+ result = start - position;
+ res = -1;
+ } else {
+ result = position - start;
+ res = 1;
+ }
+ } else {
+ stop = segment->stop;
+
+ /* cannot continue if no stop position set or invalid offset */
+ g_return_val_if_fail (stop != -1, 0);
+ g_return_val_if_fail (stop >= offset, 0);
+
+ stop -= offset;
+
+ /* bring to uncorrected position in segment */
+ if (position > stop) {
+ /* negative value */
+ result = position - stop;
+ res = -1;
+ } else {
+ result = stop - position;
+ res = 1;
+ }
+ }
+
+ if (running_time) {
+ /* scale based on the rate, avoid division by and conversion to
+ * float when not needed */
+ abs_rate = ABS (segment->rate);
+ if (G_UNLIKELY (abs_rate != 1.0))
+ result /= abs_rate;
+
+ /* correct for base of the segment */
+ if (res == 1)
+ /* positive, add base */
+ *running_time = result + segment->base;
+ else if (segment->base >= result) {
+ /* negative and base is bigger, subtract from base and we have a
+ * positive value again */
+ *running_time = segment->base - result;
+ res = 1;
+ } else {
+ /* negative and base is smaller, subtract base and remainder is
+ * negative */
+ *running_time = result - segment->base;
+ }
+ }
+ return res;
+
+done:
+ {
+ if (running_time)
+ *running_time = -1;
+ return 0;
+ }
}
/**
* segment. Position is a value between @segment start and stop time.
*
* This function is typically used by elements that need to synchronize to the
- * global clock in a pipeline. The runnning time is a constantly increasing value
+ * global clock in a pipeline. The running time is a constantly increasing value
* starting from 0. When gst_segment_init() is called, this value will reset to
* 0.
*
guint64 position)
{
guint64 result;
- guint64 start, stop;
- gdouble abs_rate;
-
- if (G_UNLIKELY (position == -1))
- return -1;
g_return_val_if_fail (segment != NULL, -1);
g_return_val_if_fail (segment->format == format, -1);
- start = segment->start;
-
- if (segment->rate > 0.0)
- start += segment->offset;
-
/* before the segment boundary */
- if (G_UNLIKELY (position < start))
+ if (G_UNLIKELY (position < segment->start)) {
+ GST_DEBUG ("position(%" G_GUINT64_FORMAT ") < start(%" G_GUINT64_FORMAT
+ ")", position, segment->start);
+ return -1;
+ }
+ /* after the segment boundary */
+ if (G_UNLIKELY (segment->stop != -1 && position > segment->stop)) {
+ GST_DEBUG ("position(%" G_GUINT64_FORMAT ") > stop(%" G_GUINT64_FORMAT
+ ")", position, segment->stop);
return -1;
-
- stop = segment->stop;
-
- if (G_LIKELY (segment->rate > 0.0)) {
- /* outside of the segment boundary stop */
- if (G_UNLIKELY (stop != -1 && position > stop))
- return -1;
-
- /* bring to uncorrected position in segment */
- result = position - start;
- } else {
- /* cannot continue if no stop position set or outside of
- * the segment. */
- if (G_UNLIKELY (stop == -1))
- return -1;
-
- stop -= segment->offset;
- if (G_UNLIKELY (position > stop))
- return -1;
-
- /* bring to uncorrected position in segment */
- result = stop - position;
}
- /* scale based on the rate, avoid division by and conversion to
- * float when not needed */
- abs_rate = ABS (segment->rate);
- if (G_UNLIKELY (abs_rate != 1.0))
- result /= abs_rate;
-
- /* correct for base of the segment */
- result += segment->base;
+ if (gst_segment_to_running_time_full (segment, format, position,
+ &result) == 1)
+ return result;
- return result;
+ return -1;
}
/**
* in @segment. @start and @stop are compared and clipped to @segment
* start and stop values.
*
- * If the function returns FALSE, @start and @stop are known to fall
+ * If the function returns %FALSE, @start and @stop are known to fall
* outside of @segment and @clip_start and @clip_stop are not updated.
*
- * When the function returns TRUE, @clip_start and @clip_stop will be
+ * When the function returns %TRUE, @clip_start and @clip_stop will be
* updated. If @clip_start or @clip_stop are different from @start or @stop
* respectively, the region fell partially in the segment.
*
* Note that when @stop is -1, @clip_stop will be set to the end of the
* segment. Depending on the use case, this may or may not be what you want.
*
- * Returns: TRUE if the given @start and @stop times fall partially or
- * completely in @segment, FALSE if the values are completely outside
+ * Returns: %TRUE if the given @start and @stop times fall partially or
+ * completely in @segment, %FALSE if the values are completely outside
* of the segment.
*/
gboolean
if (G_LIKELY (segment->rate > 0.0)) {
/* bring to corrected position in segment */
- result += start;
+ result += start + segment->offset;
/* outside of the segment boundary stop */
if (G_UNLIKELY (stop != -1 && result > stop))
return -1;
/* bring to corrected position in segment */
- result = stop - result;
+ result = stop - result - segment->offset;
}
return result;
}
-
/**
* gst_segment_set_running_time:
* @segment: a #GstSegment structure.
return TRUE;
}
+
+/**
+ * gst_segment_offset_running_time:
+ * @segment: a #GstSegment structure.
+ * @format: the format of the segment.
+ * @offset: the offset to apply in the segment
+ *
+ * Adjust the values in @segment so that @offset is applied to all
+ * future running-time calculations.
+ *
+ * Since: 1.2.3
+ *
+ * Returns: %TRUE if the segment could be updated successfully. If %FALSE is
+ * returned, @offset is not in @segment.
+ */
+gboolean
+gst_segment_offset_running_time (GstSegment * segment, GstFormat format,
+ gint64 offset)
+{
+ g_return_val_if_fail (segment != NULL, FALSE);
+ g_return_val_if_fail (segment->format == format, FALSE);
+
+ if (offset == 0)
+ return TRUE;
+
+ if (offset > 0) {
+ /* positive offset, we can simply apply to the base time */
+ segment->base += offset;
+ } else {
+ offset = -offset;
+ /* negative offset, first try to subtract from base */
+ if (segment->base > offset) {
+ segment->base -= offset;
+ } else {
+ guint64 position;
+
+ /* subtract all from segment.base, remainder in offset */
+ offset -= segment->base;
+ segment->base = 0;
+ position = gst_segment_to_position (segment, format, offset);
+ if (position == -1)
+ return FALSE;
+
+ segment->offset = position - segment->start;
+ }
+ }
+ return TRUE;
+}
+
+/**
+ * gst_segment_is_equal:
+ * @s0: a #GstSegment structure.
+ * @s1: a #GstSegment structure.
+ *
+ * Checks for two segments being equal. Equality here is defined
+ * as perfect equality, including floating point values.
+ *
+ * Since: 1.6
+ *
+ * Returns: %TRUE if the segments are equal, %FALSE otherwise.
+ */
+gboolean
+gst_segment_is_equal (const GstSegment * s0, const GstSegment * s1)
+{
+ if (s0->flags != s1->flags)
+ return FALSE;
+ if (s0->rate != s1->rate)
+ return FALSE;
+ if (s0->applied_rate != s1->applied_rate)
+ return FALSE;
+ if (s0->format != s1->format)
+ return FALSE;
+ if (s0->base != s1->base)
+ return FALSE;
+ if (s0->offset != s1->offset)
+ return FALSE;
+ if (s0->start != s1->start)
+ return FALSE;
+ if (s0->stop != s1->stop)
+ return FALSE;
+ if (s0->time != s1->time)
+ return FALSE;
+ if (s0->position != s1->position)
+ return FALSE;
+ if (s0->duration != s1->duration)
+ return FALSE;
+ return TRUE;
+}
projects / platform / upstream / gstreamer.git / blobdiff