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line21dec: general cleanup

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This ports over the review comments made on line21enc in !217
This commit is contained in:
Mathieu Duponchelle 2019-03-06 11:23:32 +01:00
parent 156865541f
commit 919cd44f47
1 changed files with 33 additions and 98 deletions
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131
ext/closedcaption/gstline21dec.c
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@ -37,33 +37,21 @@
GST_DEBUG_CATEGORY_STATIC (gst_line_21_decoder_debug);
#define GST_CAT_DEFAULT gst_line_21_decoder_debug
enum
{
PROP_0,
};
#define SUPPORTED_FORMATS "{ I420, YUY2, YVYU, UYVY, VYUY, v210 }"
#define CAPS "video/x-raw, format={ I420, YUY2, YVYU, UYVY, VYUY, v210 }, interlace-mode=interleaved"
static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE (SUPPORTED_FORMATS)));
GST_STATIC_CAPS (CAPS));
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE (SUPPORTED_FORMATS)));
GST_STATIC_CAPS (CAPS));
G_DEFINE_TYPE (GstLine21Decoder, gst_line_21_decoder, GST_TYPE_VIDEO_FILTER);
#define parent_class gst_line_21_decoder_parent_class
static void gst_line_21_decoder_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_line_21_decoder_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstStateChangeReturn gst_line_21_decoder_change_state (GstElement *
element, GstStateChange transition);
static void gst_line_21_decoder_finalize (GObject * self);
static gboolean gst_line_21_decoder_set_info (GstVideoFilter * filter,
GstCaps * incaps, GstVideoInfo * in_info,
@ -86,16 +74,11 @@ gst_line_21_decoder_class_init (GstLine21DecoderClass * klass)
transform_class = (GstBaseTransformClass *) klass;
filter_class = (GstVideoFilterClass *) klass;
gobject_class->set_property = gst_line_21_decoder_set_property;
gobject_class->get_property = gst_line_21_decoder_get_property;
gobject_class->finalize = gst_line_21_decoder_finalize;
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_line_21_decoder_change_state);
gst_element_class_set_static_metadata (gstelement_class,
"Line 21 CC Decoder",
"Filter",
"Filter/Video/ClosedCaption",
"Extract line21 CC from SD video streams",
"Edward Hervey <edward@centricular.com>");
@ -113,49 +96,13 @@ gst_line_21_decoder_class_init (GstLine21DecoderClass * klass)
vbi_initialize_gst_debug ();
}
static void
gst_line_21_decoder_reset (GstLine21Decoder * self)
{
self->line21_offset = -1;
self->max_line_probes = 40;
if (self->info) {
gst_video_info_free (self->info);
self->info = NULL;
}
g_free (self->converted_lines);
self->converted_lines = NULL;
}
static void
gst_line_21_decoder_init (GstLine21Decoder * filter)
{
gst_line_21_decoder_reset (filter);
}
GstLine21Decoder *self = (GstLine21Decoder *) filter;
static void
gst_line_21_decoder_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
/* GstLine21Decoder *filter = GST_LINE21DECODER (object); */
switch (prop_id) {
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 *filter = GST_LINE21DECODER (object); */
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
self->line21_offset = -1;
self->max_line_probes = 40;
}
static vbi_pixfmt
@ -181,7 +128,8 @@ vbi_pixfmt_from_gst_video_format (GstVideoFormat format,
return VBI_PIXFMT_YUV420;
/* All the other formats are not really bullet-proof. Force conversion */
default:
return 0;
g_assert_not_reached ();
return (vbi_pixfmt) 0;
}
#undef NATIVE_VBI_FMT
}
@ -204,6 +152,17 @@ gst_line_21_decoder_set_info (GstVideoFilter * filter,
GST_DEBUG_OBJECT (filter, "#planes : %d #components : %d",
GST_VIDEO_INFO_N_PLANES (in_info), GST_VIDEO_INFO_N_COMPONENTS (in_info));
if (self->info) {
gst_video_info_free (self->info);
self->info = NULL;
}
g_free (self->converted_lines);
self->converted_lines = NULL;
/* Scan the next frame from the first line */
self->line21_offset = -1;
if (GST_VIDEO_INFO_WIDTH (in_info) != 720) {
GST_DEBUG_OBJECT (filter, "Only 720 pixel wide formats are supported");
self->compatible_format = FALSE;
@ -244,7 +203,10 @@ gst_line_21_decoder_set_info (GstVideoFilter * filter,
/* initialize the decoder */
vbi_raw_decoder_init (&self->zvbi_decoder);
/* We either deal with PAL (625 lines) or NTSC (525 lines) */
/*
* Set up blank / black / white levels fit for NTSC, no actual relation
* with the height of the video
*/
self->zvbi_decoder.scanning = 525;
/* The pixel format. Quite a few formats are handled by zvbi, but
* some are not and require conversion (or cheating) */
@ -453,44 +415,17 @@ gst_line_21_decoder_transform_ip (GstVideoFilter * filter,
return GST_FLOW_OK;
}
static GstStateChangeReturn
gst_line_21_decoder_change_state (GstElement * element,
GstStateChange transition)
{
GstStateChangeReturn ret;
GstLine21Decoder *filter = GST_LINE21DECODER (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret != GST_STATE_CHANGE_SUCCESS)
return ret;
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_line_21_decoder_reset (filter);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
default:
break;
}
return ret;
}
static void
gst_line_21_decoder_finalize (GObject * object)
{
GstLine21Decoder *self = (GstLine21Decoder *) object;
if (self->info) {
gst_video_info_free (self->info);
self->info = NULL;
}
g_free (self->converted_lines);
self->converted_lines = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}