gstCamera.h

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/*
 * Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
 *
 * 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, sublicense,
 * 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 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 NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */
 
#ifndef __GSTREAMER_CAMERA_H__
#define __GSTREAMER_CAMERA_H__
 
#include <gst/gst.h>
#include <string>
 
#include "videoSource.h"
#include "gstBufferManager.h"
 
 
// Forward declarations
struct _GstAppSink;
 
 
class gstCamera : public videoSource
{
public:
        static gstCamera* Create( const videoOptions& options );
 
        static gstCamera* Create( const char* camera=NULL ); // use MIPI CSI camera by default
 
        static gstCamera* Create( uint32_t width, uint32_t height, const char* camera=NULL );
        
        ~gstCamera();
 
        virtual bool Open();
 
        virtual void Close();
 
        virtual bool Capture( void** image, imageFormat format, uint64_t timeout=DEFAULT_TIMEOUT, int* status=NULL );
 
        bool CaptureRGBA( float** image, uint64_t timeout=DEFAULT_TIMEOUT, bool zeroCopy=false );
 
        void SetZeroCopy(bool zeroCopy)     { mOptions.zeroCopy = zeroCopy; }
 
        virtual inline uint32_t GetType() const         { return Type; }
 
        static const uint32_t Type = (1 << 0);
 
        static const uint32_t DefaultWidth  = 1280;
 
        static const uint32_t DefaultHeight = 720;
        
private:
        static void onEOS(_GstAppSink* sink, void* user_data);
        static GstFlowReturn onPreroll(_GstAppSink* sink, void* user_data);
        static GstFlowReturn onBuffer(_GstAppSink* sink, void* user_data);
 
        gstCamera( const videoOptions& options );
 
        bool init();
        bool discover();
        bool buildLaunchStr();
 
        void checkMsgBus();
        void checkBuffer();
        
        bool matchCaps( GstCaps* caps );
        bool printCaps( GstCaps* caps );
        bool parseCaps( GstStructure* caps, videoOptions::Codec* codec, imageFormat* format, uint32_t* width, uint32_t* height, float* frameRate );
        
        _GstBus*     mBus;
        _GstAppSink* mAppSink;
        _GstElement* mPipeline;
 
        std::string  mLaunchStr;
        imageFormat  mFormatYUV;
        
        gstBufferManager* mBufferManager;
};
 
#endif