[utils]: Support camera as input source

Change-Id: If2a91a7436e05be4705425db40b0b1d41347f4c8
Signed-off-by: sayon.chen <sayon.chen@rock-chips.com>

utils/camera_source.h

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2015 Rockchip Electronics Co. LTD
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __CAMERA_SOURCE_H__
+#define __CAMERA_SOURCE_H__
+
+#include "mpp_frame.h"
+
+typedef struct CamSource CamSource;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Create a new context to capture frames from <fname>. Returns NULL on error.
+CamSource* camera_source_init(const char *device, RK_U32 bufcnt, RK_U32 width, RK_U32 height, MppFrameFormat fmt);
+
+// Stop capturing and free a context.
+MPP_RET camera_source_deinit(CamSource *ctx);
+
+// Returns the next captured frame and its meta-data.
+RK_S32 camera_source_get_frame(CamSource *ctx);
+
+// Tells the kernel it's OK to overwrite a frame captured
+MPP_RET camera_source_put_frame(CamSource *ctx, RK_S32 idx);
+
+MppBuffer camera_frame_to_buf(CamSource *ctx, RK_S32 idx);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __CAMERA_SOURCE_H__ */