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line21dec: expose ntsc-only property

Browse source 
When this is set, the element only tries to detect CC when the
height is 525 or 486 (NTSC resolutions). The height is already
checked.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1885>
This commit is contained in:
Mathieu Duponchelle 2020-12-15 22:01:33 +01:00 committed by GStreamer Marge Bot
parent 893aa67710
commit c915cb923e
2 changed files with 75 additions and 0 deletions
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73
ext/closedcaption/gstline21dec.c
View file

@ -37,6 +37,14 @@
GST_DEBUG_CATEGORY_STATIC (gst_line_21_decoder_debug);
#define GST_CAT_DEFAULT gst_line_21_decoder_debug
enum
{
PROP_0,
PROP_NTSC_ONLY,
};
#define DEFAULT_NTSC_ONLY FALSE
#define CAPS "video/x-raw, format={ I420, YUY2, YVYU, UYVY, VYUY, v210 }, interlace-mode=interleaved"
static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
@ -64,6 +72,38 @@ static GstFlowReturn gst_line_21_decoder_transform_ip (GstVideoFilter * filter,
static GstFlowReturn gst_line_21_decoder_prepare_output_buffer (GstBaseTransform
* trans, GstBuffer * in, GstBuffer ** out);
static void
gst_line_21_decoder_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstLine21Decoder *enc = GST_LINE21DECODER (object);
switch (prop_id) {
case PROP_NTSC_ONLY:
enc->ntsc_only = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_line_21_decoder_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstLine21Decoder *enc = GST_LINE21DECODER (object);
switch (prop_id) {
case PROP_NTSC_ONLY:
g_value_set_boolean (value, enc->ntsc_only);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_line_21_decoder_class_init (GstLine21DecoderClass * klass)
{
@ -78,6 +118,24 @@ gst_line_21_decoder_class_init (GstLine21DecoderClass * klass)
filter_class = (GstVideoFilterClass *) klass;
gobject_class->finalize = gst_line_21_decoder_finalize;
gobject_class->set_property = gst_line_21_decoder_set_property;
gobject_class->get_property = gst_line_21_decoder_get_property;
/**
* line21decoder:ntsc-only
*
* Whether line 21 decoding should only be attempted when the
* input resolution matches NTSC (720 x 525) or NTSC usable
* lines (720 x 486)
*
* Since: 1.20
*/
g_object_class_install_property (G_OBJECT_CLASS (klass),
PROP_NTSC_ONLY, g_param_spec_boolean ("ntsc-only",
"NTSC only",
"Whether line 21 decoding should only be attempted when the "
"input resolution matches NTSC", DEFAULT_NTSC_ONLY,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_set_static_metadata (gstelement_class,
"Line 21 CC Decoder",
@ -105,8 +163,10 @@ gst_line_21_decoder_init (GstLine21Decoder * filter)
{
GstLine21Decoder *self = (GstLine21Decoder *) filter;
self->info = NULL;
self->line21_offset = -1;
self->max_line_probes = 40;
self->ntsc_only = DEFAULT_NTSC_ONLY;
}
static vbi_pixfmt
@ -173,6 +233,15 @@ gst_line_21_decoder_set_info (GstVideoFilter * filter,
return TRUE;
}
if (self->ntsc_only &&
GST_VIDEO_INFO_HEIGHT (in_info) != 525 &&
GST_VIDEO_INFO_HEIGHT (in_info) != 486) {
GST_DEBUG_OBJECT (filter,
"NTSC-only, only 525 or 486 pixel high formats are supported");
self->compatible_format = FALSE;
return TRUE;
}
if (fmt == 0) {
if (GST_VIDEO_INFO_FORMAT (in_info) == GST_VIDEO_FORMAT_v210) {
GST_DEBUG_OBJECT (filter,
@ -428,6 +497,10 @@ gst_line_21_decoder_stop (GstBaseTransform * btrans)
GstLine21Decoder *self = (GstLine21Decoder *) btrans;
vbi_raw_decoder_destroy (&self->zvbi_decoder);
if (self->info) {
gst_video_info_free (self->info);
self->info = NULL;
}
return TRUE;
}

2
ext/closedcaption/gstline21dec.h
View file

@ -60,6 +60,8 @@ struct _GstLine21Decoder
guint8 *converted_lines;
GstVideoInfo *info;
gboolean ntsc_only;
};
struct _GstLine21DecoderClass