DecklinkReader.h

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/**
 * @file
 * @brief Header file for DecklinkReader class
 * @author Jonathan Thomas <jonathan@openshot.org>
 *
 * @ref License
 */

// Copyright (c) 2008-2019 OpenShot Studios, LLC
//
// SPDX-License-Identifier: LGPL-3.0-or-later

#ifndef OPENSHOT_DECKLINK_READER_H
#define OPENSHOT_DECKLINK_READER_H

#include "ReaderBase.h"

#include <cmath>
#include <ctime>
#include <fcntl.h>
#include <iostream>
#include <omp.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <memory>
#include <unistd.h>

#include "CacheMemory.h"
#include "Frame.h"
#include "DecklinkInput.h"

namespace openshot
{

        /**
         * @brief This class uses the Blackmagic Decklink libraries, to open video streams on Blackmagic devices.
         *
         * This requires special hardware manufactured by <a href="http://www.blackmagicdesign.com/products">Blackmagic Designs</a>.
         * Once the device is acquired and connected, this reader returns openshot::Frame objects containing the image and audio data.
         */
        class DecklinkReader : public ReaderBase
        {
        private:
                bool is_open;

                IDeckLink                                       *deckLink;
                IDeckLinkInput                          *deckLinkInput;
                IDeckLinkDisplayModeIterator    *displayModeIterator;
                IDeckLinkOutput                         *m_deckLinkOutput;
                IDeckLinkVideoConversion        *m_deckLinkConverter;
                pthread_mutex_t                         sleepMutex;
                pthread_cond_t                          sleepCond;
                IDeckLinkIterator                       *deckLinkIterator;
                DeckLinkInputDelegate           *delegate;
                IDeckLinkDisplayMode            *displayMode;
                BMDVideoInputFlags                      inputFlags;
                BMDDisplayMode                          selectedDisplayMode;
                BMDPixelFormat                          pixelFormat;
                int                                                     displayModeCount;
                int                                                     exitStatus;
                int                                                     ch;
                bool                                            foundDisplayMode;
                HRESULT                                         result;
                int                                                     g_videoModeIndex;
                int                                                     g_audioChannels;
                int                                                     g_audioSampleDepth;
                int                                                     g_maxFrames;
                int                                                     device;
                BMDTimeValue frameRateDuration, frameRateScale;
                const char *displayModeName;

        public:

                /// Constructor for DecklinkReader.  This automatically opens the device and loads
                /// the first second of video, or it throws one of the following exceptions.
                DecklinkReader(int device, int video_mode, int pixel_format, int channels, int sample_depth);
                ~DecklinkReader(); /// Destructor

                /// Close the device and video stream
                void Close();

                /// Get the cache object used by this reader (always returns NULL for this reader)
                CacheMemory* GetCache() { return NULL; };

                /// Get an openshot::Frame object for a specific frame number of this reader.  Frame number
                /// is ignored, since it always gets the latest LIVE frame.
                ///
                /// @returns The requested frame (containing the image)
                /// @param requested_frame The frame number that is requested.
                std::shared_ptr<Frame> GetFrame(int64_t requested_frame);
                unsigned long GetCurrentFrameNumber();

                /// Determine if reader is open or closed
                bool IsOpen() { return is_open; };

                /// Return the type name of the class
                std::string Name() { return "DecklinkReader"; };

                // Get and Set JSON methods
                std::string Json() const override; ///< Generate JSON string of this object
                void SetJson(const std::string value); ///< Load JSON string into this object
                Json::Value JsonValue() const; ///< Generate Json::Value for this object
                void SetJsonValue(const Json::Value root); ///< Load Json::Value into this object

                /// Open device and video stream - which is called by the constructor automatically
                void Open();
        };

}

#endif