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decklink: Implement GstBaseSrc::get_caps() to return more constrained caps

Browse source 
Instead of the template caps we can return a subset of them based on the
selected properties.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1868>
This commit is contained in:
Sebastian Dröge 2020-12-10 12:35:07 +02:00
parent be0df31b15
commit c123b79900
2 changed files with 67 additions and 0 deletions
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39
sys/decklink/gstdecklinkaudiosrc.cpp
View file

@ -125,6 +125,8 @@ gst_decklink_audio_src_change_state (GstElement * element,
static gboolean gst_decklink_audio_src_unlock (GstBaseSrc * bsrc);
static gboolean gst_decklink_audio_src_unlock_stop (GstBaseSrc * bsrc);
static GstCaps *gst_decklink_audio_src_get_caps (GstBaseSrc * bsrc,
GstCaps * filter);
static gboolean gst_decklink_audio_src_query (GstBaseSrc * bsrc,
GstQuery * query);
@ -156,6 +158,7 @@ gst_decklink_audio_src_class_init (GstDecklinkAudioSrcClass * klass)
basesrc_class->query = GST_DEBUG_FUNCPTR (gst_decklink_audio_src_query);
basesrc_class->negotiate = NULL;
basesrc_class->get_caps = GST_DEBUG_FUNCPTR (gst_decklink_audio_src_get_caps);
basesrc_class->unlock = GST_DEBUG_FUNCPTR (gst_decklink_audio_src_unlock);
basesrc_class->unlock_stop =
GST_DEBUG_FUNCPTR (gst_decklink_audio_src_unlock_stop);
@ -797,6 +800,42 @@ retry:
return flow_ret;
}
static GstCaps *
gst_decklink_audio_src_get_caps (GstBaseSrc * bsrc, GstCaps * filter)
{
GstDecklinkAudioSrc *self = GST_DECKLINK_AUDIO_SRC_CAST (bsrc);
GstCaps *caps, *template_caps;
const GstStructure *s;
gint channels;
channels = self->channels;
if (channels == 0)
channels = self->channels_found;
template_caps = gst_pad_get_pad_template_caps (GST_BASE_SRC_PAD (bsrc));
if (channels == 0) {
caps = template_caps;
} else {
if (channels > 2)
s = gst_caps_get_structure (template_caps, 1);
else
s = gst_caps_get_structure (template_caps, 0);
caps = gst_caps_new_full (gst_structure_copy (s), NULL);
gst_caps_set_simple (caps, "channels", G_TYPE_INT, channels, NULL);
gst_caps_unref (template_caps);
}
if (filter) {
GstCaps *tmp =
gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (caps);
caps = tmp;
}
return caps;
}
static gboolean
gst_decklink_audio_src_query (GstBaseSrc * bsrc, GstQuery * query)
{

28
sys/decklink/gstdecklinkvideosrc.cpp
View file

@ -223,6 +223,8 @@ static GstStateChangeReturn
gst_decklink_video_src_change_state (GstElement * element,
GstStateChange transition);
static GstCaps *gst_decklink_video_src_get_caps (GstBaseSrc * bsrc,
GstCaps * filter);
static gboolean gst_decklink_video_src_query (GstBaseSrc * bsrc,
GstQuery * query);
static gboolean gst_decklink_video_src_unlock (GstBaseSrc * bsrc);
@ -259,6 +261,7 @@ gst_decklink_video_src_class_init (GstDecklinkVideoSrcClass * klass)
basesrc_class->query = GST_DEBUG_FUNCPTR (gst_decklink_video_src_query);
basesrc_class->negotiate = NULL;
basesrc_class->get_caps = GST_DEBUG_FUNCPTR (gst_decklink_video_src_get_caps);
basesrc_class->unlock = GST_DEBUG_FUNCPTR (gst_decklink_video_src_unlock);
basesrc_class->unlock_stop =
GST_DEBUG_FUNCPTR (gst_decklink_video_src_unlock_stop);
@ -1374,6 +1377,31 @@ retry:
return flow_ret;
}
static GstCaps *
gst_decklink_video_src_get_caps (GstBaseSrc * bsrc, GstCaps * filter)
{
GstDecklinkVideoSrc *self = GST_DECKLINK_VIDEO_SRC_CAST (bsrc);
GstCaps *caps;
if (self->mode != GST_DECKLINK_MODE_AUTO) {
caps = gst_decklink_mode_get_caps (self->mode, self->caps_format, TRUE);
} else if (self->caps_mode != GST_DECKLINK_MODE_AUTO) {
caps =
gst_decklink_mode_get_caps (self->caps_mode, self->caps_format, TRUE);
} else {
caps = gst_pad_get_pad_template_caps (GST_BASE_SRC_PAD (bsrc));
}
if (filter) {
GstCaps *tmp =
gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (caps);
caps = tmp;
}
return caps;
}
static gboolean
gst_decklink_video_src_query (GstBaseSrc * bsrc, GstQuery * query)
{