*
* 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"
+#include <math.h>
+
#include "gstutils.h"
#include "gstsegment.h"
/**
* SECTION:gstsegment
+ * @title: GstSegment
* @short_description: Structure describing the configured region of interest
* in a media file.
* @see_also: #GstEvent
*
* This helper structure holds the relevant values for tracking the region of
- * interest in a media file, called a segment.
+ * interest in a media file, called a segment.
*
* The structure can be used for two purposes:
- * <itemizedlist>
- * <listitem><para>performing seeks (handling seek events)</para></listitem>
- * <listitem><para>tracking playback regions (handling newsegment events)</para></listitem>
- * </itemizedlist>
*
- * The segment is usually configured by the application with a seek event which
+ * * performing seeks (handling seek events)
+ * * tracking playback regions (handling newsegment events)
+ *
+ * The segment is usually configured by the application with a seek event which
* is propagated upstream and eventually handled by an element that performs the seek.
*
* The configured segment is then propagated back downstream with a newsegment event.
* with a start value of 0 and a stop/duration of -1, which is undefined. The default
* rate and applied_rate is 1.0.
*
- * If the segment is used for managing seeks, the segment duration should be set with
- * gst_segment_set_duration(). The public duration field contains the duration of the
- * segment. When using the segment for seeking, the start and time members should
- * normally be left to their default 0 value. The stop position is left to -1 unless
- * explicitly configured to a different value after a seek event.
+ * The public duration field contains the duration of the segment. When using
+ * the segment for seeking, the start and time members should normally be left
+ * to their default 0 value. The stop position is left to -1 unless explicitly
+ * configured to a different value after a seek event.
*
- * The current position in the segment should be set with the gst_segment_set_last_stop().
- * The public last_stop field contains the last set stop position in the segment.
+ * The current position in the segment should be set by changing the position
+ * member in the structure.
*
* For elements that perform seeks, the current segment should be updated with the
- * gst_segment_set_seek() and the values from the seek event. This method will update
- * all the segment fields. The last_stop field will contain the new playback position.
- * If the cur_type was different from GST_SEEK_TYPE_NONE, playback continues from
- * the last_stop position, possibly with updated flags or rate.
- *
- * For elements that want to use #GstSegment to track the playback region, use
- * gst_segment_set_newsegment() to update the segment fields with the information from
- * the newsegment event. The gst_segment_clip() method can be used to check and clip
+ * gst_segment_do_seek() and the values from the seek event. This method will update
+ * all the segment fields. The position field will contain the new playback position.
+ * If the start_type was different from GST_SEEK_TYPE_NONE, playback continues from
+ * the position position, possibly with updated flags or rate.
+ *
+ * For elements that want to use #GstSegment to track the playback region,
+ * update the segment fields with the information from the newsegment event.
+ * The gst_segment_clip() method can be used to check and clip
* the media data to the segment boundaries.
*
* For elements that want to synchronize to the pipeline clock, gst_segment_to_running_time()
* can be used to convert a timestamp to a value that can be used to synchronize
- * to the clock. This function takes into account all accumulated segments as well as
+ * to the clock. This function takes into account the base as well as
* any rate or applied_rate conversions.
*
- * For elements that need to perform operations on media data in stream_time,
+ * 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 2007-05-17 (0.10.13)
+ */
+
+/* FIXME 2.0: remove unused format parameter.
+ * Most of the methods in gstsegment.c take and extra GstFormat format, just to
+ * verify segment->format == format.
+ * See https://bugzilla.gnome.org/show_bug.cgi?id=788979
*/
/**
* gst_segment_copy:
- * @segment: a #GstSegment
+ * @segment: (transfer none): a #GstSegment
*
* Create a copy of given @segment.
*
- * Returns: a new #GstSegment, free with gst_segment_free().
+ * Free-function: gst_segment_free
*
- * Since: 0.10.20
+ * Returns: (transfer full): a new #GstSegment, free with gst_segment_free().
*/
GstSegment *
-gst_segment_copy (GstSegment * segment)
+gst_segment_copy (const GstSegment * segment)
{
GstSegment *result = NULL;
return result;
}
-GType
-gst_segment_get_type (void)
+/**
+ * gst_segment_copy_into:
+ * @src: (transfer none): a #GstSegment
+ * @dest: (transfer none): a #GstSegment
+ *
+ * Copy the contents of @src into @dest.
+ */
+void
+gst_segment_copy_into (const GstSegment * src, GstSegment * dest)
{
- static GType gst_segment_type = 0;
-
- if (G_UNLIKELY (gst_segment_type == 0)) {
- gst_segment_type = g_boxed_type_register_static ("GstSegment",
- (GBoxedCopyFunc) gst_segment_copy, (GBoxedFreeFunc) gst_segment_free);
- }
-
- return gst_segment_type;
+ memcpy (dest, src, sizeof (GstSegment));
}
+G_DEFINE_BOXED_TYPE (GstSegment, gst_segment,
+ (GBoxedCopyFunc) gst_segment_copy, (GBoxedFreeFunc) gst_segment_free);
+
/**
* gst_segment_new:
*
- * Allocate a new #GstSegment structure and initialize it using
+ * Allocate a new #GstSegment structure and initialize it using
* gst_segment_init().
*
- * Returns: a new #GstSegment, free with gst_segment_free().
+ * Free-function: gst_segment_free
+ *
+ * Returns: (transfer full): a new #GstSegment, free with gst_segment_free().
*/
GstSegment *
gst_segment_new (void)
/**
* gst_segment_free:
- * @segment: a #GstSegment
+ * @segment: (in) (transfer full): a #GstSegment
*
* Free the allocated segment @segment.
*/
* @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.
*
{
g_return_if_fail (segment != NULL);
+ segment->flags = GST_SEGMENT_FLAG_NONE;
segment->rate = 1.0;
- segment->abs_rate = 1.0;
segment->applied_rate = 1.0;
segment->format = format;
- segment->flags = 0;
+ segment->base = 0;
+ segment->offset = 0;
segment->start = 0;
segment->stop = -1;
segment->time = 0;
- segment->accum = 0;
- segment->last_stop = 0;
+ segment->position = 0;
segment->duration = -1;
}
/**
- * gst_segment_set_duration:
- * @segment: a #GstSegment structure.
- * @format: the format of the segment.
- * @duration: the duration of the segment info or -1 if unknown.
- *
- * Set the duration of the segment to @duration. This function is mainly
- * used by elements that perform seeking and know the total duration of the
- * segment.
- *
- * This field should be set to allow seeking requests relative to the
- * duration.
- */
-void
-gst_segment_set_duration (GstSegment * segment, GstFormat format,
- gint64 duration)
-{
- g_return_if_fail (segment != NULL);
-
- if (G_UNLIKELY (segment->format == GST_FORMAT_UNDEFINED))
- segment->format = format;
- else
- g_return_if_fail (segment->format == format);
-
- segment->duration = duration;
-}
-
-/**
- * gst_segment_set_last_stop:
- * @segment: a #GstSegment structure.
- * @format: the format of the segment.
- * @position: the position
- *
- * Set the last observed stop position in the segment to @position.
- *
- * This field should be set to allow seeking requests relative to the
- * current playing position.
- */
-void
-gst_segment_set_last_stop (GstSegment * segment, GstFormat format,
- gint64 position)
-{
- g_return_if_fail (segment != NULL);
-
- if (G_UNLIKELY (segment->format == GST_FORMAT_UNDEFINED))
- segment->format = format;
- else
- g_return_if_fail (segment->format == format);
-
- segment->last_stop = MAX (segment->start, position);
-}
-
-/**
- * gst_segment_set_seek:
+ * gst_segment_do_seek:
* @segment: a #GstSegment structure.
* @rate: the rate of the segment.
* @format: the format of the segment.
- * @flags: the seek flags for the segment
+ * @flags: the segment flags for the segment
* @start_type: the seek method
* @start: the seek start value
* @stop_type: the seek method
* @stop: the seek stop value
- * @update: boolean holding whether last_stop was updated.
+ * @update: (out) (allow-none): boolean holding whether position was updated.
*
* Update the segment structure with the field values of a seek event (see
* gst_event_new_seek()).
*
- * After calling this method, the segment field last_stop and time will
+ * After calling this method, the segment field position and time will
* contain the requested new position in the segment. The new requested
- * position in the segment depends on @rate and @start_type and @stop_type.
+ * position in the segment depends on @rate and @start_type and @stop_type.
*
* For positive @rate, the new position in the segment is the new @segment
* start field when it was updated with a @start_type different from
* #GST_SEEK_TYPE_NONE. If no update was performed on @segment start position
- * (#GST_SEEK_TYPE_NONE), @start is ignored and @segment last_stop is
+ * (#GST_SEEK_TYPE_NONE), @start is ignored and @segment position is
* unmodified.
*
* For negative @rate, the new position in the segment is the new @segment
* #GST_SEEK_TYPE_NONE. If no stop was previously configured in the segment, the
* duration of the segment will be used to update the stop position.
* If no update was performed on @segment stop position (#GST_SEEK_TYPE_NONE),
- * @stop is ignored and @segment last_stop is unmodified.
+ * @stop is ignored and @segment position is unmodified.
*
* The applied rate of the segment will be set to 1.0 by default.
* 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
- * last_stop 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.
*/
-void
-gst_segment_set_seek (GstSegment * segment, gdouble rate,
+gboolean
+gst_segment_do_seek (GstSegment * segment, gdouble rate,
GstFormat format, GstSeekFlags flags,
- GstSeekType start_type, gint64 start,
- GstSeekType stop_type, gint64 stop, gboolean * update)
+ GstSeekType start_type, guint64 start,
+ GstSeekType stop_type, guint64 stop, gboolean * update)
{
gboolean update_stop, update_start;
- gint64 last_stop;
-
- g_return_if_fail (rate != 0.0);
- g_return_if_fail (segment != NULL);
+ guint64 position, base;
- if (G_UNLIKELY (segment->format == GST_FORMAT_UNDEFINED))
- segment->format = format;
+ g_return_val_if_fail (rate != 0.0, FALSE);
+ g_return_val_if_fail (segment != NULL, FALSE);
+ g_return_val_if_fail (segment->format == format, FALSE);
update_start = update_stop = TRUE;
+ position = segment->position;
+
/* segment->start is never invalid */
switch (start_type) {
case GST_SEEK_TYPE_NONE:
/* start holds desired position, map -1 to the start */
if (start == -1)
start = 0;
- /* start must be 0 or the formats must match */
- g_return_if_fail (start == 0 || segment->format == format);
- break;
- case GST_SEEK_TYPE_CUR:
- g_return_if_fail (start == 0 || segment->format == format);
- /* add start to currently configured segment */
- start = segment->start + start;
break;
case GST_SEEK_TYPE_END:
if (segment->duration != -1) {
- g_return_if_fail (start == 0 || segment->format == format);
/* add start to total length */
start = segment->duration + start;
} else {
}
/* bring in sane range */
if (segment->duration != -1)
- start = CLAMP (start, 0, segment->duration);
+ 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) {
update_stop = FALSE;
break;
case GST_SEEK_TYPE_SET:
- /* stop holds required value, if it's not -1, it must be of the same
- * format as the segment. */
- g_return_if_fail (stop == -1 || segment->format == format);
- break;
- case GST_SEEK_TYPE_CUR:
- if (segment->stop != -1) {
- /* only add compatible formats or 0 */
- g_return_if_fail (stop == 0 || segment->format == format);
- stop = segment->stop + stop;
- } else
- stop = -1;
+ /* stop holds required value */
break;
case GST_SEEK_TYPE_END:
if (segment->duration != -1) {
- /* only add compatible formats or 0 */
- g_return_if_fail (stop == 0 || segment->format == format);
stop = segment->duration + stop;
} else {
stop = segment->stop;
/* 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)
- g_return_if_fail (start <= stop);
+ 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;
+ }
+ }
- segment->rate = rate;
- segment->abs_rate = ABS (rate);
- segment->applied_rate = 1.0;
- segment->flags = flags;
- segment->start = start;
- segment->stop = stop;
- segment->time = start;
+ if (flags & GST_SEEK_FLAG_FLUSH) {
+ /* 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);
+ }
- last_stop = segment->last_stop;
if (update_start && rate > 0.0) {
- last_stop = start;
+ position = start;
}
if (update_stop && rate < 0.0) {
if (stop != -1)
- last_stop = stop;
+ position = stop;
else {
if (segment->duration != -1)
- last_stop = segment->duration;
+ position = segment->duration;
else
- last_stop = 0;
+ position = 0;
}
}
- /* set update arg to reflect update of last_stop */
+
+ /* set update arg to reflect update of position */
if (update)
- *update = last_stop != segment->last_stop;
+ *update = position != segment->position;
+
+ /* update new values */
+ /* be explicit about our GstSeekFlag -> GstSegmentFlag conversion */
+ segment->flags = GST_SEGMENT_FLAG_NONE;
+ if ((flags & GST_SEEK_FLAG_FLUSH) != 0)
+ segment->flags |= GST_SEGMENT_FLAG_RESET;
+ 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->base = base;
+ if (rate > 0.0)
+ segment->offset = position - start;
+ else {
+ if (stop != -1)
+ segment->offset = stop - position;
+ else if (segment->duration != -1)
+ segment->offset = segment->duration - position;
+ else
+ segment->offset = 0;
+ }
- /* update new position */
- segment->last_stop = last_stop;
+ segment->start = start;
+ segment->stop = stop;
+ segment->time = start;
+ segment->position = position;
+
+ GST_INFO ("segment updated: %" GST_SEGMENT_FORMAT, segment);
+
+ return TRUE;
}
/**
- * gst_segment_set_newsegment:
+ * gst_segment_to_stream_time_full:
* @segment: a #GstSegment structure.
- * @update: flag indicating a new segment is started or updated
- * @rate: the rate of the segment.
* @format: the format of the segment.
- * @start: the new start value
- * @stop: the new stop value
- * @time: the new stream time
+ * @position: the position in the segment
+ * @stream_time: (out): result stream-time
*
- * Update the segment structure with the field values of a new segment event and
- * with a default applied_rate of 1.0.
+ * Translate @position to the total stream time using the currently configured
+ * segment. Compared to gst_segment_to_stream_time() this function can return
+ * negative stream-time.
*
- * Since: 0.10.6
- */
-void
-gst_segment_set_newsegment (GstSegment * segment, gboolean update, gdouble rate,
- GstFormat format, gint64 start, gint64 stop, gint64 time)
-{
- gst_segment_set_newsegment_full (segment, update, rate, 1.0, format, start,
- stop, time);
-}
-
-/**
- * gst_segment_set_newsegment_full:
- * @segment: a #GstSegment structure.
- * @update: flag indicating a new segment is started or updated
- * @rate: the rate of the segment.
- * @applied_rate: the applied rate of the segment.
- * @format: the format of the segment.
- * @start: the new start value
- * @stop: the new stop value
- * @time: the new stream time
+ * This function is typically used by elements that need to synchronize buffers
+ * against the clock or each other.
+ *
+ * @position can be any value and the result of this function for values outside
+ * of the segment is extrapolated.
*
- * Update the segment structure with the field values of a new segment event.
+ * When 1 is returned, @position resulted in a positive stream-time returned
+ * in @stream_time.
+ *
+ * When this function returns -1, the returned @stream_time should be negated
+ * to get the real negative stream time.
+ *
+ * Returns: a 1 or -1 on success, 0 on failure.
+ *
+ * Since: 1.8
*/
-void
-gst_segment_set_newsegment_full (GstSegment * segment, gboolean update,
- gdouble rate, gdouble applied_rate, GstFormat format, gint64 start,
- gint64 stop, gint64 time)
+gint
+gst_segment_to_stream_time_full (const GstSegment * segment, GstFormat format,
+ guint64 position, guint64 * stream_time)
{
- gint64 duration;
-
- g_return_if_fail (rate != 0.0);
- g_return_if_fail (applied_rate != 0.0);
- g_return_if_fail (segment != NULL);
+ guint64 start, stop, time;
+ gdouble abs_applied_rate;
+ gint res;
- if (G_UNLIKELY (segment->format == GST_FORMAT_UNDEFINED))
- segment->format = format;
-
- /* any other format with 0 also gives time 0, the other values are
- * invalid in the format though. */
- if (format != segment->format && start == 0) {
- format = segment->format;
- if (stop != 0)
- stop = -1;
- if (time != 0)
- time = -1;
+ /* format does not matter for -1 */
+ if (G_UNLIKELY (position == -1)) {
+ *stream_time = -1;
+ return 0;
}
- g_return_if_fail (segment->format == format);
+ g_return_val_if_fail (segment != NULL, 0);
+ g_return_val_if_fail (segment->format == format, 0);
- if (update) {
- if (segment->rate > 0.0) {
- /* an update to the current segment is done, elapsed time is
- * difference between the old start and new start. */
- if (start > segment->start)
- duration = start - segment->start;
- else
- duration = 0;
+ stop = segment->stop;
+
+ start = segment->start;
+ time = segment->time;
+
+ /* time must be known */
+ if (G_UNLIKELY (time == -1))
+ return 0;
+
+ abs_applied_rate = ABS (segment->applied_rate);
+
+ /* add or subtract from segment time based on applied rate */
+ if (G_LIKELY (segment->applied_rate > 0.0)) {
+ if (G_LIKELY (position > start)) {
+ /* 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 */
+ *stream_time += time;
+ res = 1;
} else {
- /* for negative rates, the elapsed duration is the diff between the stop
- * positions */
- if (stop != -1 && stop < segment->stop)
- duration = segment->stop - stop;
- else
- duration = 0;
+ *stream_time = start - position;
+ if (G_UNLIKELY (abs_applied_rate != 1.0))
+ *stream_time *= abs_applied_rate;
+ if (*stream_time > time) {
+ *stream_time -= time;
+ res = -1;
+ } else {
+ *stream_time = time - *stream_time;
+ res = 1;
+ }
}
} else {
- /* the new segment has to be aligned with the old segment.
- * We first update the accumulated time of the previous
- * segment. the accumulated time is used when syncing to the
- * clock.
- */
- if (segment->stop != -1) {
- duration = segment->stop - segment->start;
- } else if (segment->last_stop != -1) {
- /* else use last seen timestamp as segment stop */
- duration = segment->last_stop - segment->start;
+ /* correct for segment time. Streams with a negative applied_rate
+ * have timestamps between start and stop, as usual, but have the
+ * time member starting high and going backwards. */
+ /* cannot continue without a known segment stop */
+ if (G_UNLIKELY (stop == -1))
+ return 0;
+ if (G_UNLIKELY (position > stop)) {
+ *stream_time = position - stop;
+ if (G_UNLIKELY (abs_applied_rate != 1.0))
+ *stream_time *= abs_applied_rate;
+ if (*stream_time > time) {
+ *stream_time -= time;
+ res = -1;
+ } else {
+ *stream_time = time - *stream_time;
+ res = 1;
+ }
} else {
- /* else we don't know and throw a warning.. really, this should
- * be fixed in the element. */
- g_warning ("closing segment of unknown duration, assuming duration of 0");
- duration = 0;
+ *stream_time = stop - position;
+ if (G_UNLIKELY (abs_applied_rate != 1.0))
+ *stream_time *= abs_applied_rate;
+ *stream_time += time;
+ res = 1;
}
}
- /* use previous rate to calculate duration */
- if (segment->abs_rate != 1.0)
- duration /= segment->abs_rate;
-
- /* accumulate duration */
- segment->accum += duration;
- /* then update the current segment */
- segment->rate = rate;
- segment->abs_rate = ABS (rate);
- segment->applied_rate = applied_rate;
- segment->start = start;
- segment->last_stop = start;
- segment->stop = stop;
- segment->time = time;
+ return res;
}
/**
* @format: the format of the segment.
* @position: the position in the segment
*
- * Translate @position to stream time using the currently configured
+ * Translate @position to stream time using the currently configured
* segment. The @position value must be between @segment start and
- * stop value.
+ * stop value.
*
* This function is typically used by elements that need to operate on
* the stream time of the buffers it receives, such as effect plugins.
- * In those use cases, @position is typically the buffer timestamp or
+ * In those use cases, @position is typically the buffer timestamp or
* clock time that one wants to convert to the stream time.
- * The stream time is always between 0 and the total duration of the
- * media stream.
+ * The stream time is always between 0 and the total duration of the
+ * media stream.
*
* Returns: the position in stream_time or -1 when an invalid position
* was given.
+ *
+ * Since: 1.8
*/
-gint64
-gst_segment_to_stream_time (GstSegment * segment, GstFormat format,
- gint64 position)
+guint64
+gst_segment_to_stream_time (const GstSegment * segment, GstFormat format,
+ guint64 position)
{
- gint64 result, start, stop, time;
- gdouble abs_applied_rate;
+ guint64 result;
g_return_val_if_fail (segment != NULL, -1);
+ g_return_val_if_fail (segment->format == format, -1);
- /* format does not matter for -1 */
- if (G_UNLIKELY (position == -1))
+ /* before the segment boundary */
+ 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;
+ }
- if (G_UNLIKELY (segment->format == GST_FORMAT_UNDEFINED))
- segment->format = format;
+ if (gst_segment_to_stream_time_full (segment, format, position, &result) == 1)
+ return result;
- /* if we have the position for the same format as the segment, we can compare
- * the start and stop values, otherwise we assume 0 and -1 */
- if (segment->format == format) {
- start = segment->start;
- stop = segment->stop;
- time = segment->time;
+ return -1;
+}
+
+/**
+ * gst_segment_position_from_stream_time_full:
+ * @segment: a #GstSegment structure.
+ * @format: the format of the segment.
+ * @stream_time: the stream-time
+ * @position: (out): the resulting position in the segment
+ *
+ * Translate @stream_time to the segment position using the currently configured
+ * segment. Compared to gst_segment_position_from_stream_time() this function can
+ * return negative segment position.
+ *
+ * This function is typically used by elements that need to synchronize buffers
+ * against the clock or each other.
+ *
+ * @stream_time can be any value and the result of this function for values outside
+ * of the segment is extrapolated.
+ *
+ * When 1 is returned, @stream_time resulted in a positive position returned
+ * in @position.
+ *
+ * When this function returns -1, the returned @position should be negated
+ * to get the real negative segment position.
+ *
+ * Returns: a 1 or -1 on success, 0 on failure.
+ *
+ * Since: 1.8
+ */
+gint
+gst_segment_position_from_stream_time_full (const GstSegment * segment,
+ GstFormat format, guint64 stream_time, guint64 * position)
+{
+ guint64 start, time;
+ gdouble abs_applied_rate;
+ gint res;
+
+ /* format does not matter for -1 */
+ if (G_UNLIKELY (stream_time == -1)) {
+ *position = -1;
+ return 0;
+ }
+
+ g_return_val_if_fail (segment != NULL, -1);
+ g_return_val_if_fail (segment->format == format, -1);
+
+ start = segment->start;
+ time = segment->time;
+
+ /* time must be known */
+ if (G_UNLIKELY (time == -1))
+ return 0;
+
+ abs_applied_rate = ABS (segment->applied_rate);
+
+ if (G_LIKELY (segment->applied_rate > 0.0)) {
+ if (G_LIKELY (stream_time > time)) {
+ res = 1;
+ *position = stream_time - time;
+ } else {
+ res = -1;
+ *position = time - stream_time;
+ }
+ /* correct for applied rate if needed */
+ if (G_UNLIKELY (abs_applied_rate != 1.0))
+ *position /= abs_applied_rate;
+
+ if (G_UNLIKELY (res == -1)) {
+ if (*position > start) {
+ *position -= start;
+ } else {
+ *position = start - *position;
+ res = 1;
+ }
+ } else {
+ *position += start;
+ }
} else {
- start = 0;
- stop = -1;
- time = 0;
+ GstClockTime stop = segment->stop;
+ /* cannot continue without a known segment stop */
+ if (G_UNLIKELY (stop == -1))
+ return 0;
+ if (G_UNLIKELY (time > stream_time)) {
+ res = -1;
+ *position = time - stream_time;
+ } else {
+ res = 1;
+ *position = stream_time - time;
+ }
+ if (G_UNLIKELY (abs_applied_rate != 1.0))
+ *position /= abs_applied_rate;
+ if (G_UNLIKELY (stop < *position)) {
+ if (G_LIKELY (res == 1)) {
+ *position -= stop;
+ res = -1;
+ } else {
+ *position += stop;
+ res = 1;
+ }
+ } else {
+ if (G_LIKELY (res == 1)) {
+ *position = stop - *position;
+ res = 1;
+ } else {
+ *position += stop;
+ res = 1;
+ }
+ }
}
- /* outside of the segment boundary stop */
- if (G_UNLIKELY (stop != -1 && position > stop))
- return -1;
+ return res;
+}
+
+/**
+ * gst_segment_position_from_stream_time:
+ * @segment: a #GstSegment structure.
+ * @format: the format of the segment.
+ * @stream_time: the stream_time in the segment
+ *
+ * Convert @stream_time into a position in the segment so that
+ * gst_segment_to_stream_time() with that position returns @stream_time.
+ *
+ * Returns: the position in the segment for @stream_time. This function returns
+ * -1 when @stream_time is -1 or when it is not inside @segment.
+ *
+ * Since: 1.8
+ */
+guint64
+gst_segment_position_from_stream_time (const GstSegment * segment,
+ GstFormat format, guint64 stream_time)
+{
+ guint64 position;
+ gint res;
+
+ g_return_val_if_fail (segment != NULL, -1);
+ g_return_val_if_fail (segment->format == format, -1);
+
+ res =
+ gst_segment_position_from_stream_time_full (segment, format, stream_time,
+ &position);
/* 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;
+ }
- /* time must be known */
- if (G_UNLIKELY (time == -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;
+ }
- /* bring to uncorrected position in segment */
- result = position - start;
+ if (res == 1)
+ return position;
- abs_applied_rate = ABS (segment->applied_rate);
+ return -1;
+}
- /* correct for applied rate if needed */
- if (abs_applied_rate != 1.0)
- result *= abs_applied_rate;
+/**
+ * gst_segment_to_running_time_full:
+ * @segment: a #GstSegment structure.
+ * @format: the format of the segment.
+ * @position: the position in the segment
+ * @running_time: (out) (allow-none): 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 each other.
+ *
+ * @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;
+ }
- /* add or subtract from segment time based on applied rate */
- if (segment->applied_rate > 0.0) {
- /* correct for segment time */
- result += time;
+ 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 {
- /* 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 (time > result)
- result = time - result;
- else
- result = 0;
+ stop = segment->stop;
+
+ if (stop == -1 && segment->duration != -1)
+ stop = segment->start + segment->duration;
+
+ /* 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;
+ }
}
- return result;
+ 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;
+ }
}
/**
* @format: the format of the segment.
* @position: the position in the segment
*
- * Translate @position to the total running time using the currently configured
- * and previously accumulated segments. Position is a value between @segment
- * start and stop time.
+ * Translate @position to the total running time using the currently configured
+ * 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.
*
* Returns: the position as the total running time or -1 when an invalid position
* was given.
*/
-gint64
-gst_segment_to_running_time (GstSegment * segment, GstFormat format,
- gint64 position)
+guint64
+gst_segment_to_running_time (const GstSegment * segment, GstFormat format,
+ guint64 position)
{
- gint64 result;
- gint64 start, stop, accum;
+ guint64 result;
g_return_val_if_fail (segment != NULL, -1);
+ g_return_val_if_fail (segment->format == format, -1);
- if (G_UNLIKELY (position == -1))
+ /* before the segment boundary */
+ if (G_UNLIKELY (position < segment->start)) {
+ GST_DEBUG ("position(%" G_GUINT64_FORMAT ") < start(%" G_GUINT64_FORMAT
+ ")", position, segment->start);
return -1;
-
- if (G_UNLIKELY (segment->format == GST_FORMAT_UNDEFINED))
- segment->format = format;
-
- /* if we have the position for the same format as the segment, we can compare
- * the start and stop values, otherwise we assume 0 and -1 */
- if (segment->format == format) {
- start = segment->start;
- stop = segment->stop;
- accum = segment->accum;
- } else {
- start = 0;
- stop = -1;
- accum = 0;
}
-
- /* before the segment boundary */
- if (G_UNLIKELY (position < start))
+ /* 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;
-
- if (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 || 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 */
- if (segment->abs_rate != 1.0)
- result /= segment->abs_rate;
+ if (gst_segment_to_running_time_full (segment, format, position,
+ &result) == 1)
+ return result;
- /* correct for accumulated segments */
- result += accum;
-
- return result;
+ return -1;
}
/**
* @format: the format of the segment.
* @start: the start position in the segment
* @stop: the stop position in the segment
- * @clip_start: the clipped start position in the segment
- * @clip_stop: the clipped stop position in the segment
+ * @clip_start: (out) (allow-none): the clipped start position in the segment
+ * @clip_stop: (out) (allow-none): the clipped stop position in the segment
*
* Clip the given @start and @stop values to the segment boundaries given
- * in @segment. @start and @stop are compared and clipped to @segment
+ * 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
-gst_segment_clip (GstSegment * segment, GstFormat format, gint64 start,
- gint64 stop, gint64 * clip_start, gint64 * clip_stop)
+gst_segment_clip (const GstSegment * segment, GstFormat format, guint64 start,
+ guint64 stop, guint64 * clip_start, guint64 * clip_stop)
{
g_return_val_if_fail (segment != NULL, FALSE);
-
- if (G_UNLIKELY (segment->format == GST_FORMAT_UNDEFINED))
- segment->format = format;
- else
- g_return_val_if_fail (segment->format == format, FALSE);
-
- /* if we have a stop position and a valid start and start is bigger,
- * we're outside of the segment */
- if (G_UNLIKELY (segment->stop != -1 && start != -1 && start >= segment->stop))
+ g_return_val_if_fail (segment->format == format, FALSE);
+
+ /* if we have a stop position and a valid start and start is bigger,
+ * we're outside of the segment. (Special case) segment start and
+ * segment stop can be identical. In this case, if start is also identical,
+ * it's inside of segment */
+ if (G_UNLIKELY (segment->stop != -1 && start != -1 && (start > segment->stop
+ || (segment->start != segment->stop && start == segment->stop))))
return FALSE;
/* if a stop position is given and is before the segment start,
- * we're outside of the segment */
- if (G_UNLIKELY (stop != -1 && stop != start && stop <= segment->start))
+ * we're outside of the segment. Special case is were start
+ * and stop are equal to the segment start. In that case we
+ * are inside the segment. */
+ if (G_UNLIKELY (stop != -1 && (stop < segment->start || (start != stop
+ && stop == segment->start))))
return FALSE;
if (clip_start) {
if (stop == -1)
*clip_stop = segment->stop;
else if (segment->stop == -1)
- *clip_stop = MAX (-1, stop);
+ *clip_stop = stop;
else
*clip_stop = MIN (stop, segment->stop);
+ }
- if (segment->duration != -1)
- *clip_stop = MIN (*clip_stop, segment->duration);
+ return TRUE;
+}
+
+/**
+ * gst_segment_position_from_running_time:
+ * @segment: a #GstSegment structure.
+ * @format: the format of the segment.
+ * @running_time: the running_time in the segment
+ *
+ * Convert @running_time into a position in the segment so that
+ * gst_segment_to_running_time() with that position returns @running_time.
+ *
+ * Returns: the position in the segment for @running_time. This function returns
+ * -1 when @running_time is -1 or when it is not inside @segment.
+ *
+ * Since: 1.8
+ */
+guint64
+gst_segment_position_from_running_time (const GstSegment * segment,
+ GstFormat format, guint64 running_time)
+{
+ guint64 position;
+ gint res;
+
+ g_return_val_if_fail (segment != NULL, -1);
+ g_return_val_if_fail (segment->format == format, -1);
+
+ res =
+ gst_segment_position_from_running_time_full (segment, format,
+ running_time, &position);
+
+ if (res != 1)
+ return -1;
+
+ /* before the segment boundary */
+ 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;
+ }
+
+ return position;
+}
+
+/**
+ * gst_segment_position_from_running_time_full:
+ * @segment: a #GstSegment structure.
+ * @format: the format of the segment.
+ * @running_time: the running-time
+ * @position: (out): the resulting position in the segment
+ *
+ * Translate @running_time to the segment position using the currently configured
+ * segment. Compared to gst_segment_position_from_running_time() this function can
+ * return negative segment position.
+ *
+ * This function is typically used by elements that need to synchronize buffers
+ * against the clock or each other.
+ *
+ * @running_time can be any value and the result of this function for values
+ * outside of the segment is extrapolated.
+ *
+ * When 1 is returned, @running_time resulted in a positive position returned
+ * in @position.
+ *
+ * When this function returns -1, the returned @position was < 0, and the value
+ * in the position variable should be negated to get the real negative segment
+ * position.
+ *
+ * Returns: a 1 or -1 on success, 0 on failure.
+ *
+ * Since: 1.8
+ */
+gint
+gst_segment_position_from_running_time_full (const GstSegment * segment,
+ GstFormat format, guint64 running_time, guint64 * position)
+{
+ gint res;
+ guint64 start, stop, base;
+ gdouble abs_rate;
+
+ if (G_UNLIKELY (running_time == -1)) {
+ *position = -1;
+ return 0;
+ }
+
+ g_return_val_if_fail (segment != NULL, 0);
+ g_return_val_if_fail (segment->format == format, 0);
+
+ base = segment->base;
+
+ abs_rate = ABS (segment->rate);
+
+ start = segment->start;
+ stop = segment->stop;
+
+ if (G_LIKELY (segment->rate > 0.0)) {
+ /* start by subtracting the base time */
+ if (G_LIKELY (running_time >= base)) {
+ *position = running_time - base;
+ /* move into the segment at the right rate */
+ if (G_UNLIKELY (abs_rate != 1.0))
+ *position = ceil (*position * abs_rate);
+ /* bring to corrected position in segment */
+ *position += start + segment->offset;
+ res = 1;
+ } else {
+ *position = base - running_time;
+ if (G_UNLIKELY (abs_rate != 1.0))
+ *position = ceil (*position * abs_rate);
+ if (start + segment->offset >= *position) {
+ /* The TS is before the segment, but the result is >= 0 */
+ *position = start + segment->offset - *position;
+ res = 1;
+ } else {
+ /* The TS is before the segment, and the result is < 0
+ * so negate the return result */
+ *position = *position - (start + segment->offset);
+ res = -1;
+ }
+ }
+ } else {
+ if (G_LIKELY (running_time >= base)) {
+ *position = running_time - base;
+ if (G_UNLIKELY (abs_rate != 1.0))
+ *position = ceil (*position * abs_rate);
+ if (G_UNLIKELY (stop < *position + segment->offset)) {
+ *position += segment->offset - stop;
+ res = -1;
+ } else {
+ *position = stop - *position - segment->offset;
+ res = 1;
+ }
+ } else {
+ /* This case is tricky. Requested running time precedes the
+ * segment base, so in a reversed segment where rate < 0, that
+ * means it's before the alignment point of (stop - offset).
+ * Before = always bigger than (stop-offset), which is usually +ve,
+ * but could be -ve is offset is big enough. -ve position implies
+ * that the offset has clipped away the entire segment anyway */
+ *position = base - running_time;
+ if (G_UNLIKELY (abs_rate != 1.0))
+ *position = ceil (*position * abs_rate);
+
+ if (G_LIKELY (stop + *position >= segment->offset)) {
+ *position = stop + *position - segment->offset;
+ res = 1;
+ } else {
+ /* Requested position is still negative because offset is big,
+ * so negate the result */
+ *position = segment->offset - *position - stop;
+ res = -1;
+ }
+ }
+ }
+ return res;
+}
+
+/**
+ * gst_segment_to_position:
+ * @segment: a #GstSegment structure.
+ * @format: the format of the segment.
+ * @running_time: the running_time in the segment
+ *
+ * Convert @running_time into a position in the segment so that
+ * gst_segment_to_running_time() with that position returns @running_time.
+ *
+ * Returns: the position in the segment for @running_time. This function returns
+ * -1 when @running_time is -1 or when it is not inside @segment.
+ *
+ * Deprecated: Use gst_segment_position_from_running_time() instead.
+ */
+#ifndef GST_REMOVE_DEPRECATED
+guint64
+gst_segment_to_position (const GstSegment * segment, GstFormat format,
+ guint64 running_time)
+{
+ return gst_segment_position_from_running_time (segment, format, running_time);
+}
+#endif
+
+/**
+ * gst_segment_set_running_time:
+ * @segment: a #GstSegment structure.
+ * @format: the format of the segment.
+ * @running_time: the running_time in the segment
+ *
+ * Adjust the start/stop and base values of @segment such that the next valid
+ * buffer will be one with @running_time.
+ *
+ * Returns: %TRUE if the segment could be updated successfully. If %FALSE is
+ * returned, @running_time is -1 or not in @segment.
+ */
+gboolean
+gst_segment_set_running_time (GstSegment * segment, GstFormat format,
+ guint64 running_time)
+{
+ guint64 position;
+ guint64 start, stop;
+
+ /* start by bringing the running_time into the segment position */
+ position =
+ gst_segment_position_from_running_time (segment, format, running_time);
+
+ /* we must have a valid position now */
+ if (G_UNLIKELY (position == -1))
+ return FALSE;
+
+ start = segment->start;
+ stop = segment->stop;
+
+ if (G_LIKELY (segment->rate > 0.0)) {
+ /* update the start and time values */
+ start = position;
+ } else {
+ /* reverse, update stop */
+ stop = position;
+ }
+ /* and base time is exactly the running time */
+ segment->time = gst_segment_to_stream_time (segment, format, start);
+ segment->start = start;
+ segment->stop = stop;
+ segment->base = running_time;
+
+ 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_position_from_running_time (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;
}