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decklinkvideosrc: Add support for extracing CEA608 according to S334-1 Annex A

Browse source 
https://bugzilla.gnome.org/show_bug.cgi?id=797363
This commit is contained in:
Sebastian Dröge 2018-11-01 17:59:17 +02:00
parent dcad6d1031
commit 3d8a0b8996
1 changed files with 30 additions and 11 deletions
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41
sys/decklink/gstdecklinkvideosrc.cpp
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@ -836,18 +836,37 @@ extract_cc_from_vbi (GstDecklinkVideoSrc * self, GstBuffer ** buffer,
while (gst_video_vbi_parser_get_ancillary (self->vbiparser,
&gstanc) == GST_VIDEO_VBI_PARSER_RESULT_OK) {
if (GST_VIDEO_ANCILLARY_DID16 (&gstanc) ==
GST_VIDEO_ANCILLARY_DID16_S334_EIA_708) {
GST_DEBUG_OBJECT (self,
"Adding CEA-708 CDP meta to buffer for line %d", fi);
GST_MEMDUMP_OBJECT (self, "CDP", gstanc.data, gstanc.data_count);
gst_buffer_add_video_caption_meta (*buffer,
GST_VIDEO_CAPTION_TYPE_CEA708_CDP, gstanc.data,
gstanc.data_count);
found = TRUE;
self->last_cc_vbi_line = fi;
break;
switch (GST_VIDEO_ANCILLARY_DID16 (&gstanc)) {
case GST_VIDEO_ANCILLARY_DID16_S334_EIA_708:
GST_DEBUG_OBJECT (self,
"Adding CEA-708 CDP meta to buffer for line %d", fi);
GST_MEMDUMP_OBJECT (self, "CDP", gstanc.data, gstanc.data_count);
gst_buffer_add_video_caption_meta (*buffer,
GST_VIDEO_CAPTION_TYPE_CEA708_CDP, gstanc.data,
gstanc.data_count);
break;
case GST_VIDEO_ANCILLARY_DID16_S334_EIA_608:
GST_DEBUG_OBJECT (self,
"Adding CEA-608 meta to buffer for line %d", fi);
GST_MEMDUMP_OBJECT (self, "CEA608", gstanc.data, gstanc.data_count);
/* The first byte actually contains the field and line offset but
* for CEA608-in-CEA708 we can't store the line offset, and it's
* generally not needed
*/
gstanc.data[0] = (gstanc.data[0] & 0x80) ? 0xFD : 0xFC;
gst_buffer_add_video_caption_meta (*buffer,
GST_VIDEO_CAPTION_TYPE_CEA608_IN_CEA708_RAW, gstanc.data,
gstanc.data_count);
break;
default:
/* otherwise continue looking */
continue;
}
found = TRUE;
self->last_cc_vbi_line = fi;
break;
}
}