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ccconverter: Send gap event if generated output is empty

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Sends a gap event if nothing to output for a given input buffer.
For example, an input buffer might not contain any caption data
for downstream requested field, then we need to inform downstream
of the case.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6073>
This commit is contained in:
Seungha Yang 2024-02-08 23:03:29 +09:00 committed by GStreamer Marge Bot
parent 550a21ccbe
commit d2d2ac43e8
1 changed files with 19 additions and 0 deletions
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19
subprojects/gst-plugins-bad/ext/closedcaption/gstccconverter.c
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@ -1703,6 +1703,25 @@ gst_cc_converter_generate_output (GstBaseTransform * base, GstBuffer ** outbuf)
if (gst_buffer_get_size (*outbuf) <= 0) {
gst_buffer_unref (*outbuf);
*outbuf = NULL;
if (inbuf && GST_BUFFER_PTS_IS_VALID (inbuf)) {
GstClockTime dur = 0;
GstEvent *gap;
GST_TRACE_OBJECT (self, "Empty generated output for input %"
GST_PTR_FORMAT, inbuf);
if (GST_BUFFER_DURATION_IS_VALID (inbuf)) {
dur = GST_BUFFER_DURATION (inbuf);
} else if (self->in_fps_n > 0 && self->in_fps_d > 0) {
dur = gst_util_uint64_scale (GST_SECOND,
self->in_fps_d, self->in_fps_n);
}
gap = gst_event_new_gap (GST_BUFFER_PTS (inbuf), dur);
gst_pad_push_event (GST_BASE_TRANSFORM_SRC_PAD (self), gap);
}
ret = GST_FLOW_OK;
}