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;
+ }
}
/**
guint64 position)
{
guint64 result;
- guint64 start, stop;
- gdouble abs_rate;
-
- if (G_UNLIKELY (position == -1)) {
- GST_DEBUG ("invalid 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, start);
+ ")", position, segment->start);
return -1;
}
-
- stop = segment->stop;
-
- if (G_LIKELY (segment->rate > 0.0)) {
- /* after of the segment boundary */
- if (G_UNLIKELY (stop != -1 && position > stop)) {
- GST_DEBUG ("position(%" G_GUINT64_FORMAT ") > stop(%" G_GUINT64_FORMAT
- ")", 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)) {
- GST_DEBUG ("invalid stop (-1)");
- return -1;
- }
-
- stop -= segment->offset;
- if (G_UNLIKELY (position > stop)) {
- GST_DEBUG ("position(%" G_GUINT64_FORMAT ") > stop(%" G_GUINT64_FORMAT
- ")", position, stop);
- return -1;
- }
-
- /* bring to uncorrected position in segment */
- result = stop - position;
+ /* 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;
}
- /* 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;
}
/**
}
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;
+}