Rework buffer management to be more generic and support untiled format

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>

src/video.c

@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2018 Paul Kocialkowski <paul.kocialkowski@bootlin.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/ioctl.h>
+
+#include <linux/videodev2.h>
+#include <drm_fourcc.h>
+
+#include "video.h"
+#include "utils.h"
+
+static struct video_format formats[] = {
+	{
+		.description		= "NV12 YUV",
+		.v4l2_format		= V4L2_PIX_FMT_NV12,
+		.v4l2_buffers_count	= 1,
+		.drm_format		= DRM_FORMAT_NV12,
+		.drm_modifier		= DRM_FORMAT_MOD_NONE,
+		.drm_planes_count	= 2,
+		.bpp			= 16,
+	},
+	{
+		.description		= "MB32-tiled NV12 YUV",
+		.v4l2_format		= V4L2_PIX_FMT_MB32_NV12,
+		.v4l2_buffers_count	= 1,
+		.drm_format		= DRM_FORMAT_NV12,
+		.drm_modifier		= DRM_FORMAT_MOD_ALLWINNER_MB32_TILED,
+		.drm_planes_count	= 2,
+		.bpp			= 16
+	},
+};
+
+static unsigned int formats_count = sizeof(formats) / sizeof(formats[0]);
+
+struct video_format *video_format_find(bool tiled_format)
+{
+	unsigned int pixelformat;
+	unsigned int i;
+
+	pixelformat = video_v4l2_format(tiled_format);
+
+	for (i = 0; i < formats_count; i++)
+		if (formats[i].v4l2_format == pixelformat)
+			return &formats[i];
+
+	return NULL;
+}