PawletOS/external_libcamera
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

gstreamer: Added virtual functions needed to support request pads

Browse Source 
This patch adds support for using request pads in libcamerasrc Gst
Element. It allows a user to request multiple streams if the platform
supports multistream output using libcamera.

This was tested on Raspberry Pi 4B+ with a camera connected to CSI port.
It can be tested by running the following command

gst-launch-1.0 libcamerasrc camera-name="<camera-name-here>" name=src src.src ! queue ! videoconvert ! autovideosink src.src_0 ! queue ! videoconvert ! autovideosink

Signed-off-by: Vedant Paranjape <vedantparanjape160201@gmail.com>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
This commit is contained in:
Vedant Paranjape
2021-06-19 00:02:18 +05:30
committed by Paul Elder
parent e4e3af642e
commit 53a0d80af0
1 changed files with 52 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

53
src/gstreamer/gstlibcamerasrc.cpp
View File

@@ -361,10 +361,12 @@ gst_libcamera_src_task_enter(GstTask *task, [[maybe_unused]] GThread *thread,
GST_DEBUG_OBJECT(self, "Streaming thread has started");
guint group_id = gst_util_group_id_next();
gint stream_id_num = 0;
StreamRoles roles;
for (GstPad *srcpad : state->srcpads_) {
/* Create stream-id and push stream-start. */
g_autofree gchar *stream_id = gst_pad_create_stream_id(srcpad, GST_ELEMENT(self), nullptr);
g_autofree gchar *stream_id_intermediate = g_strdup_printf("%i%i", group_id, stream_id_num++);
g_autofree gchar *stream_id = gst_pad_create_stream_id(srcpad, GST_ELEMENT(self), stream_id_intermediate);
GstEvent *event = gst_event_new_stream_start(stream_id);
gst_event_set_group_id(event, group_id);
gst_pad_push_event(srcpad, event);
@@ -640,6 +642,53 @@ gst_libcamera_src_init(GstLibcameraSrc *self)
self->state = state;
}
static GstPad *
gst_libcamera_src_request_new_pad(GstElement *element, GstPadTemplate *templ,
const gchar *name, [[maybe_unused]] const GstCaps *caps)
{
GstLibcameraSrc *self = GST_LIBCAMERA_SRC(element);
g_autoptr(GstPad) pad = NULL;
GST_DEBUG_OBJECT(self, "new request pad created");
pad = gst_pad_new_from_template(templ, name);
g_object_ref_sink(pad);
if (gst_element_add_pad(element, pad)) {
GLibLocker lock(GST_OBJECT(self));
self->state->srcpads_.push_back(reinterpret_cast<GstPad *>(g_object_ref(pad)));
} else {
GST_ELEMENT_ERROR(element, STREAM, FAILED,
("Internal data stream error."),
("Could not add pad to element"));
return NULL;
}
return reinterpret_cast<GstPad *>(g_steal_pointer(&pad));
}
static void
gst_libcamera_src_release_pad(GstElement *element, GstPad *pad)
{
GstLibcameraSrc *self = GST_LIBCAMERA_SRC(element);
GST_DEBUG_OBJECT(self, "Pad %" GST_PTR_FORMAT " being released", pad);
{
GLibLocker lock(GST_OBJECT(self));
std::vector<GstPad *> &pads = self->state->srcpads_;
auto begin_iterator = pads.begin();
auto end_iterator = pads.end();
auto pad_iterator = std::find(begin_iterator, end_iterator, pad);
if (pad_iterator != end_iterator) {
g_object_unref(*pad_iterator);
pads.erase(pad_iterator);
}
}
gst_element_remove_pad(element, pad);
}
static void
gst_libcamera_src_class_init(GstLibcameraSrcClass *klass)
{
@@ -650,6 +699,8 @@ gst_libcamera_src_class_init(GstLibcameraSrcClass *klass)
object_class->get_property = gst_libcamera_src_get_property;
object_class->finalize = gst_libcamera_src_finalize;
element_class->request_new_pad = gst_libcamera_src_request_new_pad;
element_class->release_pad = gst_libcamera_src_release_pad;
element_class->change_state = gst_libcamera_src_change_state;
gst_element_class_set_metadata(element_class,