*
* 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_pos field will contain the new playback position.
+ * 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_pos position, possibly with updated flags or rate.
+ * 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
* 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 2006-05-03 (0.10.6)
+ * Last reviewed on 2007-05-17 (0.10.13)
*/
-static GstSegment *
+/**
+ * gst_segment_copy:
+ * @segment: a #GstSegment
+ *
+ * Create a copy of given @segment.
+ *
+ * Returns: a new #GstSegment, free with gst_segment_free().
+ *
+ * Since: 0.10.20
+ */
+GstSegment *
gst_segment_copy (GstSegment * segment)
{
GstSegment *result = NULL;
if (segment) {
- result = gst_segment_new ();
- memcpy (result, segment, sizeof (GstSegment));
+ result = (GstSegment *) g_slice_copy (sizeof (GstSegment), segment);
}
return result;
}
{
GstSegment *result;
- result = g_new0 (GstSegment, 1);
+ result = g_slice_new0 (GstSegment);
gst_segment_init (result, GST_FORMAT_UNDEFINED);
return result;
void
gst_segment_free (GstSegment * segment)
{
- g_free (segment);
+ g_slice_free (GstSegment, segment);
}
/**
* @start: the seek start value
* @stop_type: the seek method
* @stop: the seek stop value
- * @update: boolean holding whether start or stop were updated.
+ * @update: boolean holding whether last_stop was updated.
*
* Update the segment structure with the field values of a seek event (see
* gst_event_new_seek()).
* 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
+ * has been changed but not the playback position.
*/
void
gst_segment_set_seek (GstSegment * segment, gdouble rate,
GstSeekType stop_type, gint64 stop, gboolean * update)
{
gboolean update_stop, update_start;
+ gint64 last_stop;
g_return_if_fail (rate != 0.0);
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);
- update_stop = update_start = TRUE;
+ update_start = update_stop = TRUE;
- /* start is never invalid */
+ /* segment->start is never invalid */
switch (start_type) {
case GST_SEEK_TYPE_NONE:
- /* no update to segment */
+ /* no update to segment, take previous start */
start = segment->start;
update_start = FALSE;
break;
/* 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:
- /* add start to currently configure segment */
+ 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 {
update_stop = FALSE;
break;
case GST_SEEK_TYPE_SET:
- /* stop holds required value */
+ /* 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)
+ if (segment->stop != -1) {
+ /* only add compatible formats or 0 */
+ g_return_if_fail (stop == 0 || segment->format == format);
stop = segment->stop + stop;
- else
+ } else
stop = -1;
break;
case GST_SEEK_TYPE_END:
- if (segment->duration != -1)
+ if (segment->duration != -1) {
+ /* only add compatible formats or 0 */
+ g_return_if_fail (stop == 0 || segment->format == format);
stop = segment->duration + stop;
- else {
+ } else {
stop = segment->stop;
update_stop = FALSE;
}
segment->applied_rate = 1.0;
segment->flags = flags;
segment->start = start;
+ segment->stop = stop;
+ segment->time = start;
+
+ last_stop = segment->last_stop;
if (update_start && rate > 0.0) {
- segment->last_stop = start;
+ last_stop = start;
}
if (update_stop && rate < 0.0) {
if (stop != -1)
- segment->last_stop = stop;
+ last_stop = stop;
else {
if (segment->duration != -1)
- segment->last_stop = segment->duration;
+ last_stop = segment->duration;
else
- segment->last_stop = 0;
+ last_stop = 0;
}
}
- segment->time = start;
- segment->stop = stop;
-
+ /* set update arg to reflect update of last_stop */
if (update)
- *update = update_start || update_stop;
+ *update = last_stop != segment->last_stop;
+
+ /* update new position */
+ segment->last_stop = last_stop;
}
/**
gdouble rate, gdouble applied_rate, GstFormat format, gint64 start,
gint64 stop, gint64 time)
{
- gint64 duration;
+ gint64 duration, last_stop;
g_return_if_fail (rate != 0.0);
g_return_if_fail (applied_rate != 0.0);
g_return_if_fail (segment != NULL);
+ GST_DEBUG ("configuring segment update %d, rate %lf, format %s, "
+ "start %" G_GINT64_FORMAT ", stop %" G_GINT64_FORMAT ", position %"
+ G_GINT64_FORMAT, update, rate, gst_format_get_name (format), start,
+ stop, time);
+ GST_DEBUG ("old segment was: %" GST_SEGMENT_FORMAT, segment);
+
if (G_UNLIKELY (segment->format == GST_FORMAT_UNDEFINED))
segment->format = format;
g_return_if_fail (segment->format == format);
if (update) {
- /* 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;
+ if (G_LIKELY (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;
+ } 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;
+ }
+ /* update last_stop to be a valid value in the updated segment */
+ if (start > segment->last_stop)
+ last_stop = start;
+ else if (stop != -1 && stop < segment->last_stop)
+ last_stop = stop;
else
- duration = 0;
+ last_stop = segment->last_stop;
} 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.
- */
+ * clock. */
if (segment->stop != -1) {
duration = segment->stop - segment->start;
} else if (segment->last_stop != -1) {
g_warning ("closing segment of unknown duration, assuming duration of 0");
duration = 0;
}
+ /* position the last_stop to the next expected position in the new segment,
+ * which is the start or the stop of the segment */
+ if (rate > 0.0)
+ last_stop = start;
+ else
+ last_stop = stop;
}
/* use previous rate to calculate duration */
- if (segment->abs_rate != 1.0)
+ if (G_LIKELY (segment->abs_rate != 1.0))
duration /= segment->abs_rate;
/* accumulate duration */
segment->abs_rate = ABS (rate);
segment->applied_rate = applied_rate;
segment->start = start;
- segment->last_stop = start;
+ segment->last_stop = last_stop;
segment->stop = stop;
segment->time = time;
}
gst_segment_to_stream_time (GstSegment * segment, GstFormat format,
gint64 position)
{
- gint64 result;
+ gint64 result, start, stop, time;
gdouble abs_applied_rate;
g_return_val_if_fail (segment != NULL, -1);
if (G_UNLIKELY (segment->format == GST_FORMAT_UNDEFINED))
segment->format = format;
- else
- g_return_val_if_fail (segment->format == format, -1);
+
+ /* 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 (G_LIKELY (segment->format == format)) {
+ start = segment->start;
+ stop = segment->stop;
+ time = segment->time;
+ } else {
+ start = 0;
+ stop = -1;
+ time = 0;
+ }
/* outside of the segment boundary stop */
- if (G_UNLIKELY (segment->stop != -1 && position > segment->stop))
+ if (G_UNLIKELY (stop != -1 && position > stop))
return -1;
/* before the segment boundary */
- if (G_UNLIKELY (position < segment->start))
+ if (G_UNLIKELY (position < start))
return -1;
/* time must be known */
- if (G_UNLIKELY (segment->time == -1))
+ if (G_UNLIKELY (time == -1))
return -1;
/* bring to uncorrected position in segment */
- result = position - segment->start;
+ result = position - start;
abs_applied_rate = ABS (segment->applied_rate);
/* correct for applied rate if needed */
- if (abs_applied_rate != 1.0)
+ if (G_UNLIKELY (abs_applied_rate != 1.0))
result *= abs_applied_rate;
/* add or subtract from segment time based on applied rate */
- if (segment->applied_rate > 0.0) {
+ if (G_LIKELY (segment->applied_rate > 0.0)) {
/* correct for segment time */
- result += segment->time;
+ result += time;
} else {
- /* correct for segment time, clamp at 0 */
- if (segment->time > result)
- result = segment->time - result;
+ /* 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;
}
gint64 position)
{
gint64 result;
+ gint64 start, stop, accum;
g_return_val_if_fail (segment != NULL, -1);
if (G_UNLIKELY (segment->format == GST_FORMAT_UNDEFINED))
segment->format = format;
- else if (segment->accum)
- g_return_val_if_fail (segment->format == format, -1);
+
+ /* 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 (G_LIKELY (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 < segment->start))
+ if (G_UNLIKELY (position < start))
return -1;
- if (segment->rate > 0.0) {
+ if (G_LIKELY (segment->rate > 0.0)) {
/* outside of the segment boundary stop */
- if (G_UNLIKELY (segment->stop != -1 && position > segment->stop))
+ if (G_UNLIKELY (stop != -1 && position > stop))
return -1;
/* bring to uncorrected position in segment */
- result = position - segment->start;
+ result = position - start;
} else {
/* cannot continue if no stop position set or outside of
* the segment. */
- if (G_UNLIKELY (segment->stop == -1 || position > segment->stop))
+ if (G_UNLIKELY (stop == -1 || position > stop))
return -1;
/* bring to uncorrected position in segment */
- result = segment->stop - position;
+ result = stop - position;
}
/* scale based on the rate, avoid division by and conversion to
* float when not needed */
- if (segment->abs_rate != 1.0)
+ if (G_UNLIKELY (segment->abs_rate != 1.0))
result /= segment->abs_rate;
/* correct for accumulated segments */
- result += segment->accum;
+ result += accum;
return result;
}
* 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
* of the segment.
return TRUE;
}
+
+/**
+ * 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.
+ *
+ * Since: 0.10.24
+ */
+gint64
+gst_segment_to_position (GstSegment * segment, GstFormat format,
+ gint64 running_time)
+{
+ gint64 result;
+ gint64 start, stop, accum;
+
+ g_return_val_if_fail (segment != NULL, -1);
+
+ if (G_UNLIKELY (running_time == -1))
+ 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 (G_LIKELY (segment->format == format)) {
+ start = segment->start;
+ stop = segment->stop;
+ accum = segment->accum;
+ } else {
+ start = 0;
+ stop = -1;
+ accum = 0;
+ }
+
+ /* this running_time was for a previous segment */
+ if (running_time < accum)
+ return -1;
+
+ /* start by subtracting the accumulated time */
+ result = running_time - accum;
+
+ /* move into the segment at the right rate */
+ if (G_UNLIKELY (segment->abs_rate != 1.0))
+ result *= segment->abs_rate;
+
+ if (G_LIKELY (segment->rate > 0.0)) {
+ /* bring to corrected position in segment */
+ result += start;
+
+ /* outside of the segment boundary stop */
+ if (G_UNLIKELY (stop != -1 && result > stop))
+ return -1;
+ } else {
+ /* cannot continue if no stop position set or outside of
+ * the segment. */
+ if (G_UNLIKELY (stop == -1 || result + start > stop))
+ return -1;
+
+ /* bring to corrected position in segment */
+ result = stop - result;
+ }
+ return result;
+}
+
+
+/**
+ * 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 accum 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.
+ *
+ * Since: 0.10.24
+ */
+gboolean
+gst_segment_set_running_time (GstSegment * segment, GstFormat format,
+ gint64 running_time)
+{
+ gint64 position;
+ gint64 start, stop, last_stop;
+
+ /* start by bringing the running_time into the segment position */
+ position = gst_segment_to_position (segment, format, running_time);
+
+ /* we must have a valid position now */
+ if (G_UNLIKELY (position == -1))
+ return FALSE;
+
+ start = segment->start;
+ stop = segment->stop;
+ last_stop = segment->last_stop;
+
+ if (G_LIKELY (segment->rate > 0.0)) {
+ /* update the start/last_stop and time values */
+ start = position;
+ if (last_stop < start)
+ last_stop = start;
+ } else {
+ /* reverse, update stop */
+ stop = position;
+ /* if we were past the position, go back */
+ if (last_stop > stop)
+ last_stop = stop;
+ }
+ /* and accumulated time is exactly the running time */
+ segment->time = gst_segment_to_stream_time (segment, format, start);
+ segment->start = start;
+ segment->stop = stop;
+ segment->last_stop = last_stop;
+ segment->accum = running_time;
+
+ return TRUE;
+}
projects / platform / upstream / gstreamer.git / blobdiff