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video-anc: Add API for converting GstVideoCaptionType from/to GstCaps

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Sebastian Dröge 2018-12-11 14:10:36 +02:00 committed by Sebastian Dröge
parent 1eb3a20617
commit fd1a31ee11
3 changed files with 92 additions and 0 deletions
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2
docs/libs/gst-plugins-base-libs-sections.txt
View file

@ -3580,6 +3580,8 @@ GstVideoCaptionType
GstVideoCaptionMeta
gst_buffer_get_video_caption_meta
gst_buffer_add_video_caption_meta
gst_video_caption_type_from_caps
gst_video_caption_type_to_caps
<SUBSECTION Standard>
GST_TYPE_VIDEO_ANCILLARY_DID
GST_TYPE_VIDEO_ANCILLARY_DI_D16

82
gst-libs/gst/video/video-anc.c
View file

@ -966,3 +966,85 @@ gst_buffer_add_video_caption_meta (GstBuffer * buffer,
return meta;
}
/**
* gst_video_caption_type_from_caps:
* @caps: Fixed #GstCaps to parse
*
* Parses fixed Closed Caption #GstCaps and returns the corresponding caption
* type, or %GST_VIDEO_CAPTION_TYPE_UNKNOWN.
*
* Returns: #GstVideoCaptionType.
*
* Since: 1.16
*/
GstVideoCaptionType
gst_video_caption_type_from_caps (const GstCaps * caps)
{
const GstStructure *s;
const gchar *format;
g_return_val_if_fail (gst_caps_is_fixed (caps),
GST_VIDEO_CAPTION_TYPE_UNKNOWN);
s = gst_caps_get_structure (caps, 0);
g_return_val_if_fail (s != NULL, GST_VIDEO_CAPTION_TYPE_UNKNOWN);
format = gst_structure_get_string (s, "format");
if (gst_structure_has_name (s, "closedcaption/x-cea-608")) {
if (g_strcmp0 (format, "raw") == 0) {
return GST_VIDEO_CAPTION_TYPE_CEA608_RAW;
} else if (g_strcmp0 (format, "s334-1a") == 0) {
return GST_VIDEO_CAPTION_TYPE_CEA608_S334_1A;
}
} else if (gst_structure_has_name (s, "closedcaption/x-cea-708")) {
if (g_strcmp0 (format, "cc_data") == 0) {
return GST_VIDEO_CAPTION_TYPE_CEA708_RAW;
} else if (g_strcmp0 (format, "cdp") == 0) {
return GST_VIDEO_CAPTION_TYPE_CEA708_CDP;
}
}
return GST_VIDEO_CAPTION_TYPE_UNKNOWN;
}
/**
* gst_video_caption_type_to_caps:
* @type: #GstVideoCaptionType
*
* Creates new caps corresponding to @type.
*
* Returns: (transfer full): new #GstCaps
*
* Since: 1.16
*/
GstCaps *
gst_video_caption_type_to_caps (GstVideoCaptionType type)
{
GstCaps *caption_caps;
g_return_val_if_fail (type != GST_VIDEO_CAPTION_TYPE_UNKNOWN, NULL);
switch (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_S334_1A:
caption_caps = gst_caps_new_simple ("closedcaption/x-cea-608",
"format", G_TYPE_STRING, "s334-1a", 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);
break;
default:
g_return_val_if_reached (NULL);
break;
}
return caption_caps;
}

8
gst-libs/gst/video/video-anc.h
View file

@ -134,6 +134,14 @@ typedef enum {
GST_VIDEO_CAPTION_TYPE_CEA708_CDP = 4
} GstVideoCaptionType;
GST_VIDEO_API
GstVideoCaptionType
gst_video_caption_type_from_caps (const GstCaps *caps);
GST_VIDEO_API
GstCaps *
gst_video_caption_type_to_caps (GstVideoCaptionType type);
/**
* GstVideoCaptionMeta:
* @meta: parent #GstMeta