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gst: libcamerasrc: Add a task for the streaming thread

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Use a GstTask as our internal streaming thread. Unlike GstBaseSrc, we
will be running a streaming thread at the element level rather than
per pad. This is needed to combine buffer request for multiple pads.

Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Nicolas Dufresne 2020-01-20 16:52:14 -05:00 • committed by Laurent Pinchart
parent 58feb69f85
commit 1d8cbaf214
1 changed files with 51 additions and 0 deletions
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51
src/gstreamer/gstlibcamerasrc.cpp
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@ -27,7 +27,11 @@ struct GstLibcameraSrcState {
struct _GstLibcameraSrc {
GstElement parent;
GRecMutex stream_lock;
GstTask *task;
GstPad *srcpad;
gchar *camera_name;
GstLibcameraSrcState *state;
@ -113,6 +117,30 @@ gst_libcamera_src_open(GstLibcameraSrc *self)
return true;
}
static void
gst_libcamera_src_task_run(gpointer user_data)
{
GstLibcameraSrc *self = GST_LIBCAMERA_SRC(user_data);
GST_DEBUG_OBJECT(self, "Streaming thread is now capturing");
}
static void
gst_libcamera_src_task_enter(GstTask *task, GThread *thread, gpointer user_data)
{
GstLibcameraSrc *self = GST_LIBCAMERA_SRC(user_data);
GST_DEBUG_OBJECT(self, "Streaming thread has started");
}
static void
gst_libcamera_src_task_leave(GstTask *task, GThread *thread, gpointer user_data)
{
GstLibcameraSrc *self = GST_LIBCAMERA_SRC(user_data);
GST_DEBUG_OBJECT(self, "Streaming thread is about to stop");
}
static void
gst_libcamera_src_close(GstLibcameraSrc *self)
{
@ -183,9 +211,24 @@ gst_libcamera_src_change_state(GstElement *element, GstStateChange transition)
return GST_STATE_CHANGE_FAILURE;
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
/* This needs to be called after pads activation.*/
if (!gst_task_pause(self->task))
return GST_STATE_CHANGE_FAILURE;
ret = GST_STATE_CHANGE_NO_PREROLL;
break;
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
ret = GST_STATE_CHANGE_NO_PREROLL;
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
/*
* \todo this might require some thread unblocking in the future
* if the streaming thread starts doing any kind of blocking
* operations. If this was the case, we would need to do so
* before pad deactivation, so before chaining to the parent
* change_state function.
*/
gst_task_join(self->task);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
gst_libcamera_src_close(self);
break;
@ -202,6 +245,8 @@ gst_libcamera_src_finalize(GObject *object)
GObjectClass *klass = G_OBJECT_CLASS(gst_libcamera_src_parent_class);
GstLibcameraSrc *self = GST_LIBCAMERA_SRC(object);
g_rec_mutex_clear(&self->stream_lock);
g_clear_object(&self->task);
g_free(self->camera_name);
delete self->state;
@ -214,6 +259,12 @@ gst_libcamera_src_init(GstLibcameraSrc *self)
GstLibcameraSrcState *state = new GstLibcameraSrcState();
GstPadTemplate *templ = gst_element_get_pad_template(GST_ELEMENT(self), "src");
g_rec_mutex_init(&self->stream_lock);
self->task = gst_task_new(gst_libcamera_src_task_run, self, nullptr);
gst_task_set_enter_callback(self->task, gst_libcamera_src_task_enter, self, nullptr);
gst_task_set_leave_callback(self->task, gst_libcamera_src_task_leave, self, nullptr);
gst_task_set_lock(self->task, &self->stream_lock);
self->srcpad = gst_pad_new_from_template(templ, "src");
gst_element_add_pad(GST_ELEMENT(self), self->srcpad);
self->state = state;