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authorVedant Paranjape <vedantparanjape160201@gmail.com>2021-06-19 00:02:18 +0530
committerPaul Elder <paul.elder@ideasonboard.com>2021-06-25 20:03:49 +0900
commit53a0d80af0f9983d6bc0d54b0e85403a08721488 (patch)
tree35645f889f4929803f2404bf147d640052177fd6 /src
parente4e3af642e03b57123c472ce743fdf8eb08e016a (diff)
gstreamer: Added virtual functions needed to support request pads
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>
Diffstat (limited to 'src')
-rw-r--r--src/gstreamer/gstlibcamerasrc.cpp53
1 files changed, 52 insertions, 1 deletions
diff --git a/src/gstreamer/gstlibcamerasrc.cpp b/src/gstreamer/gstlibcamerasrc.cpp
index ccc61590..ea53c2b5 100644
--- a/src/gstreamer/gstlibcamerasrc.cpp
+++ b/src/gstreamer/gstlibcamerasrc.cpp
@@ -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,