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ccextractor: Support changes of the caption type

Browse source 
https://bugzilla.gnome.org/show_bug.cgi?id=797370
This commit is contained in:
Sebastian Dröge 2018-11-02 12:21:24 +02:00
parent 3d8a0b8996
commit 7cfe6b0bf3
1 changed files with 42 additions and 28 deletions
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70
ext/closedcaption/gstccextractor.c
View file

@ -224,6 +224,34 @@ gst_cc_extractor_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
return gst_pad_event_default (pad, parent, event);
}
static GstCaps *
create_caps_from_caption_type (GstVideoCaptionType caption_type)
{
GstCaps *caption_caps = NULL;
switch (caption_type) {
case GST_VIDEO_CAPTION_TYPE_CEA608_RAW:
caption_caps = gst_caps_new_simple ("closedcaption/x-cea-608",
"format", G_TYPE_STRING, "raw", NULL);
break;
case GST_VIDEO_CAPTION_TYPE_CEA608_IN_CEA708_RAW:
caption_caps = gst_caps_new_simple ("closedcaption/x-cea-608",
"format", G_TYPE_STRING, "cc_data", NULL);
break;
case GST_VIDEO_CAPTION_TYPE_CEA708_RAW:
caption_caps = gst_caps_new_simple ("closedcaption/x-cea-708",
"format", G_TYPE_STRING, "cc_data", NULL);
break;
case GST_VIDEO_CAPTION_TYPE_CEA708_CDP:
caption_caps = gst_caps_new_simple ("closedcaption/x-cea-708",
"format", G_TYPE_STRING, "cdp", NULL);
default:
break;
}
return caption_caps;
}
static GstFlowReturn
gst_cc_extractor_handle_meta (GstCCExtractor * filter, GstBuffer * buf,
GstVideoCaptionMeta * meta)
@ -236,37 +264,11 @@ gst_cc_extractor_handle_meta (GstCCExtractor * filter, GstBuffer * buf,
GST_DEBUG_OBJECT (filter, "Handling meta");
/* Check if the meta type matches the configured one */
if (filter->captionpad != NULL && meta->caption_type != filter->caption_type) {
GST_ERROR_OBJECT (filter,
"GstVideoCaptionMeta type changed, Not handled currently");
flow = GST_FLOW_NOT_NEGOTIATED;
goto out;
}
if (filter->captionpad == NULL) {
GstCaps *caption_caps = NULL;
GstCaps *caption_caps = create_caps_from_caption_type (meta->caption_type);
GstEvent *stream_event;
GST_DEBUG_OBJECT (filter, "Creating new caption pad");
switch (meta->caption_type) {
case GST_VIDEO_CAPTION_TYPE_CEA608_RAW:
caption_caps = gst_caps_new_simple ("closedcaption/x-cea-608",
"format", G_TYPE_STRING, "raw", NULL);
break;
case GST_VIDEO_CAPTION_TYPE_CEA608_IN_CEA708_RAW:
caption_caps = gst_caps_new_simple ("closedcaption/x-cea-608",
"format", G_TYPE_STRING, "cc_data", NULL);
break;
case GST_VIDEO_CAPTION_TYPE_CEA708_RAW:
caption_caps = gst_caps_new_simple ("closedcaption/x-cea-708",
"format", G_TYPE_STRING, "cc_data", NULL);
break;
case GST_VIDEO_CAPTION_TYPE_CEA708_CDP:
caption_caps = gst_caps_new_simple ("closedcaption/x-cea-708",
"format", G_TYPE_STRING, "cdp", NULL);
default:
break;
}
if (caption_caps == NULL) {
GST_ERROR_OBJECT (filter, "Unknown/invalid caption type");
return GST_FLOW_NOT_NEGOTIATED;
@ -307,6 +309,19 @@ gst_cc_extractor_handle_meta (GstCCExtractor * filter, GstBuffer * buf,
if ((event = gst_pad_get_sticky_event (filter->srcpad, GST_EVENT_TAG, 0)))
gst_pad_push_event (filter->captionpad, event);
filter->caption_type = meta->caption_type;
} else if (meta->caption_type != filter->caption_type) {
GstCaps *caption_caps = create_caps_from_caption_type (meta->caption_type);
GST_DEBUG_OBJECT (filter, "Caption type changed from %d to %d",
filter->caption_type, meta->caption_type);
if (caption_caps == NULL) {
GST_ERROR_OBJECT (filter, "Unknown/invalid caption type");
return GST_FLOW_NOT_NEGOTIATED;
}
gst_pad_set_caps (filter->captionpad, caption_caps);
gst_caps_unref (caption_caps);
filter->caption_type = meta->caption_type;
}
@ -323,7 +338,6 @@ gst_cc_extractor_handle_meta (GstCCExtractor * filter, GstBuffer * buf,
/* We don't really care about the flow return */
flow = gst_pad_push (filter->captionpad, outbuf);
out:
/* Set flow return on pad and return combined value */
return gst_flow_combiner_update_pad_flow (filter->combiner,
filter->captionpad, flow);