[libcamera-devel] [PATCH v1 21/23] gst: pad: Add method to store retrieve pending buffers
Nicolas Dufresne
nicolas at ndufresne.ca
Wed Jan 29 04:32:08 CET 2020
From: Nicolas Dufresne <nicolas.dufresne at collabora.com>
These will be useful for streaming. The requestComplete callback will
store the buffers on each pads so that the _run() can pick them up
and push them through the pads from a streaming thread.
Signed-off-by: Nicolas Dufresne <nicolas.dufresne at collabora.com>
---
src/gstreamer/gstlibcamerapad.cpp | 28 ++++++++++++++++++++++++++++
src/gstreamer/gstlibcamerapad.h | 4 ++++
2 files changed, 32 insertions(+)
diff --git a/src/gstreamer/gstlibcamerapad.cpp b/src/gstreamer/gstlibcamerapad.cpp
index 6401810..4a775e4 100644
--- a/src/gstreamer/gstlibcamerapad.cpp
+++ b/src/gstreamer/gstlibcamerapad.cpp
@@ -17,6 +17,7 @@ struct _GstLibcameraPad {
GstPad parent;
StreamRole role;
GstLibcameraPool *pool;
+ GQueue pending_buffers;
};
enum {
@@ -136,3 +137,30 @@ gst_libcamera_pad_get_stream(GstPad *pad)
return nullptr;
}
+
+void
+gst_libcamera_pad_queue_buffer(GstPad *pad, GstBuffer *buffer)
+{
+ GST_OBJECT_LOCKER(pad);
+ auto *self = GST_LIBCAMERA_PAD(pad);
+
+ g_queue_push_head(&self->pending_buffers, buffer);
+}
+
+GstFlowReturn
+gst_libcamera_pad_push_pending(GstPad *pad)
+{
+ auto *self = GST_LIBCAMERA_PAD(pad);
+ GstBuffer *buffer;
+ GstFlowReturn ret = GST_FLOW_CUSTOM_SUCCESS;
+
+ {
+ GST_OBJECT_LOCKER(self);
+ buffer = (GstBuffer *)g_queue_pop_tail(&self->pending_buffers);
+ }
+
+ if (buffer)
+ ret = gst_pad_push(pad, buffer);
+
+ return ret;
+}
diff --git a/src/gstreamer/gstlibcamerapad.h b/src/gstreamer/gstlibcamerapad.h
index 81d0d58..d928570 100644
--- a/src/gstreamer/gstlibcamerapad.h
+++ b/src/gstreamer/gstlibcamerapad.h
@@ -26,4 +26,8 @@ void gst_libcamera_pad_set_pool(GstPad *pad, GstLibcameraPool *pool);
libcamera::Stream *gst_libcamera_pad_get_stream(GstPad *pad);
+void gst_libcamera_pad_queue_buffer(GstPad *pad, GstBuffer *buffer);
+
+GstFlowReturn gst_libcamera_pad_push_pending(GstPad *pad);
+
#endif /* __GST_LIBCAMERA_PAD_H__ */
--
2.24.1
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