g_return_if_fail (segment->format == format);
if (update) {
- if (segment->rate > 0.0) {
+ 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)
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 */
/* 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) {
+ if (G_LIKELY (segment->format == format)) {
start = segment->start;
stop = segment->stop;
time = segment->time;
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 += 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 (time > result)
+ if (G_LIKELY (time > result))
result = time - result;
else
result = 0;
/* 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) {
+ if (G_LIKELY (segment->format == format)) {
start = segment->start;
stop = segment->stop;
accum = segment->accum;
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 (stop != -1 && position > stop))
return -1;
/* 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 */
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