gstDecoder.h

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/*
 * Copyright (c) 2018, 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_DECODER_H__
#define __GSTREAMER_DECODER_H__
 
#include "gstUtility.h"
#include "gstBufferManager.h"
 
#include "videoSource.h"
 
 
// Forward declarations
class WebRTCServer;
struct WebRTCPeer;
struct _GstAppSink;
 
 
class gstDecoder : public videoSource
{
public:
        static gstDecoder* Create( const videoOptions& options );
 
        static gstDecoder* Create( const URI& resource, videoOptions::Codec codec );
        
        ~gstDecoder();
 
        virtual bool Capture( void** image, imageFormat format, uint64_t timeout=DEFAULT_TIMEOUT, int* status=NULL );
 
        virtual bool Open();
 
        virtual void Close();
 
        inline bool IsEOS() const                               { return mEOS; }
 
        virtual inline uint32_t GetType() const         { return Type; }
 
        static const uint32_t Type = (1 << 1);
 
        static const char* SupportedExtensions[];
 
        static bool IsSupportedExtension( const char* ext );
 
protected:
        gstDecoder( const videoOptions& options );
        
        void checkMsgBus();
        void checkBuffer();
        bool buildLaunchStr();
        bool discover();
        
        bool init();
        bool initPipeline();
        void destroyPipeline();
        
        inline bool isLooping() const { return (mOptions.loop < 0) || ((mOptions.loop > 0) && (mLoopCount < mOptions.loop)); }
 
        // appsink callbacks
        static void onEOS(_GstAppSink* sink, void* user_data);
        
        static GstFlowReturn onPreroll(_GstAppSink* sink, void* user_data);
        static GstFlowReturn onBuffer(_GstAppSink* sink, void* user_data);
 
        // WebRTC callbacks
        static void onWebsocketMessage( WebRTCPeer* peer, const char* message, size_t message_size, void* user_data );
 
        GstBus*      mBus;
        GstElement*  mPipeline;
        _GstAppSink* mAppSink;
        
        Event     mWaitEvent;
        std::string mLaunchStr;
        bool        mCustomSize;
        bool              mCustomRate;
        bool        mEOS;
        size_t    mLoopCount;
                
        gstBufferManager* mBufferManager;
        
        WebRTCServer* mWebRTCServer;
        bool mWebRTCConnected;
};
  
#endif