[libcamera-devel] [PATCH v3 19/27] gst: libcamerasrc: Allocate and release buffers
Laurent Pinchart
laurent.pinchart at ideasonboard.com
Fri Mar 6 21:55:35 CET 2020
Hi Nicolas,
Thank you for the patch.
On Fri, Mar 06, 2020 at 03:26:29PM -0500, Nicolas Dufresne wrote:
> From: Nicolas Dufresne <nicolas.dufresne at collabora.com>
>
> Setup the allocation and the release of buffers in the
> element. We have one pooling GstAllocator that wraps the
> FrameBufferAllocator and tracks the lifetime of FrameBuffer
> objects. Then, for each pad we have a GstBufferPool object
> which is only used to avoid re-allocating the GstBuffer
> structure every time we push a buffer.
>
> Signed-off-by: Nicolas Dufresne <nicolas.dufresne at collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> ---
> src/gstreamer/gstlibcamerasrc.cpp | 28 ++++++++++++++++++++++++++++
> 1 file changed, 28 insertions(+)
>
> diff --git a/src/gstreamer/gstlibcamerasrc.cpp b/src/gstreamer/gstlibcamerasrc.cpp
> index 540a094..5ffc004 100644
> --- a/src/gstreamer/gstlibcamerasrc.cpp
> +++ b/src/gstreamer/gstlibcamerasrc.cpp
> @@ -19,7 +19,9 @@
> #include <libcamera/camera.h>
> #include <libcamera/camera_manager.h>
>
> +#include "gstlibcameraallocator.h"
> #include "gstlibcamerapad.h"
> +#include "gstlibcamerapool.h"
> #include "gstlibcamera-utils.h"
>
> using namespace libcamera;
> @@ -44,6 +46,7 @@ struct _GstLibcameraSrc {
> gchar *camera_name;
>
> GstLibcameraSrcState *state;
> + GstLibcameraAllocator *allocator;
> };
>
> enum {
> @@ -221,6 +224,23 @@ gst_libcamera_src_task_enter(GstTask *task, GThread *thread, gpointer user_data)
> return;
> }
>
> + self->allocator = gst_libcamera_allocator_new(state->cam_);
> + if (!self->allocator) {
> + GST_ELEMENT_ERROR(self, RESOURCE, NO_SPACE_LEFT,
> + ("Failed to allocate memory"),
> + ("gst_libcamera_allocator_new() failed."));
> + gst_task_stop(task);
> + return;
> + }
> +
> + for (gsize i = 0; i < state->srcpads_.size(); i++) {
> + GstPad *srcpad = state->srcpads_[i];
> + const StreamConfiguration &stream_cfg = state->config_->at(i);
> + GstLibcameraPool *pool = gst_libcamera_pool_new(self->allocator,
> + stream_cfg.stream());
> + gst_libcamera_pad_set_pool(srcpad, pool);
> + }
> +
> done:
> switch (flow_ret) {
> case GST_FLOW_NOT_NEGOTIATED:
> @@ -236,8 +256,14 @@ static void
> gst_libcamera_src_task_leave(GstTask *task, GThread *thread, gpointer user_data)
> {
> GstLibcameraSrc *self = GST_LIBCAMERA_SRC(user_data);
> + GstLibcameraSrcState *state = self->state;
>
> GST_DEBUG_OBJECT(self, "Streaming thread is about to stop");
> +
> + for (GstPad *srcpad : state->srcpads_)
> + gst_libcamera_pad_set_pool(srcpad, NULL);
> +
> + g_clear_object(&self->allocator);
> }
>
> static void
> @@ -246,6 +272,8 @@ gst_libcamera_src_close(GstLibcameraSrc *self)
> GstLibcameraSrcState *state = self->state;
> gint ret;
>
> + GST_DEBUG_OBJECT(self, "Releasing resources");
> +
> ret = state->cam_->release();
> if (ret) {
> GST_ELEMENT_WARNING(self, RESOURCE, BUSY,
--
Regards,
Laurent Pinchart
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