v4l2: Extract video buffer structure to separate file

The v4l2_video_buffer structure describes a video buffer. It is used by
the v4l2_device class only, but isn't otherwise tied to V4L2. To prepare
for non-V4L2 video sources, extract it to a separate file and rename it
to video_buffer.

At the same time, add a new video_buffer_set structure to represent as
set of video buffers.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/video-buffers.c b/video-buffers.c
new file mode 100644
index 0000000..f5dc6ec
--- /dev/null
+++ b/video-buffers.c
@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Video buffers
+ *
+ * Copyright (C) 2018 Laurent Pinchart
+ *
+ * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+ */
+
+#include "video-buffers.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+struct video_buffer_set *video_buffer_set_new(unsigned int nbufs)
+{
+	struct video_buffer_set *buffers;
+
+	buffers = malloc(sizeof *buffers);
+	if (!buffers)
+		return NULL;
+
+	buffers->nbufs = nbufs;
+	buffers->buffers = calloc(nbufs, sizeof *buffers->buffers);
+	if (!buffers->buffers) {
+		free(buffers);
+		return NULL;
+	}
+
+	return buffers;
+}
+
+void video_buffer_set_delete(struct video_buffer_set *buffers)
+{
+	if (!buffers)
+		return;
+
+	free(buffers->buffers);
+	free(buffers);
+}