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basesrc: Add new API for handling GstSegment update by subclass

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Add API gst_base_src_new_segment() for subclass to be able to
signalling new GstSegment which should be applied to following
buffers.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/490>
This commit is contained in:
Seungha Yang 2020-05-17 00:08:56 +09:00 committed by Jan Schmidt
parent 1627222aa5
commit a78a9cf0c3
2 changed files with 59 additions and 0 deletions
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55
libs/gst/base/gstbasesrc.c
View file

@ -896,6 +896,61 @@ gst_base_src_new_seamless_segment (GstBaseSrc * src, gint64 start, gint64 stop,
return res;
}
/**
* gst_base_src_new_segment:
* @src: a #GstBaseSrc
* @segment: a pointer to a #GstSegment
*
* Prepare a new segment for emission downstream. This function must
* only be called by derived sub-classes, and only from the #GstBaseSrcClass::create function,
* as the stream-lock needs to be held.
*
* The format for the @segment must be identical with the current format
* of the source, as configured with gst_base_src_set_format().
*
* The format of @src must not be %GST_FORMAT_UNDEFINED and the format
* should be configured via gst_base_src_set_format() before calling this method.
*
* Returns: %TRUE if preparation of new segment succeeded.
*
* Since: 1.18
*/
gboolean
gst_base_src_new_segment (GstBaseSrc * src, const GstSegment * segment)
{
g_return_val_if_fail (GST_IS_BASE_SRC (src), FALSE);
g_return_val_if_fail (segment != NULL, FALSE);
GST_OBJECT_LOCK (src);
if (src->segment.format == GST_FORMAT_UNDEFINED) {
/* subclass must set valid format before calling this method */
GST_WARNING_OBJECT (src, "segment format is not configured yet, ignore");
GST_OBJECT_UNLOCK (src);
return FALSE;
}
if (src->segment.format != segment->format) {
GST_WARNING_OBJECT (src, "segment format mismatched, ignore");
GST_OBJECT_UNLOCK (src);
return FALSE;
}
gst_segment_copy_into (segment, &src->segment);
/* Mark pending segment. Will be sent before next data */
src->priv->segment_pending = TRUE;
src->priv->segment_seqnum = gst_util_seqnum_next ();
GST_DEBUG_OBJECT (src, "Starting new segment %" GST_PTR_FORMAT, segment);
GST_OBJECT_UNLOCK (src);
src->running = TRUE;
return TRUE;
}
/* called with STREAM_LOCK */
static gboolean
gst_base_src_send_stream_start (GstBaseSrc * src)

4
libs/gst/base/gstbasesrc.h
View file

@ -308,6 +308,10 @@ gboolean gst_base_src_get_do_timestamp (GstBaseSrc *src);
GST_BASE_API
gboolean gst_base_src_new_seamless_segment (GstBaseSrc *src, gint64 start, gint64 stop, gint64 time);
GST_BASE_API
gboolean gst_base_src_new_segment (GstBaseSrc *src,
const GstSegment * segment);
GST_BASE_API
gboolean gst_base_src_set_caps (GstBaseSrc *src, GstCaps *caps);