FFMLibrary.h

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/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
 
#ifndef META_OCEAN_MEDIA_FFM_FFM_LIBRARY_H
#define META_OCEAN_MEDIA_FFM_FFM_LIBRARY_H
 
#include "ocean/media/ffmpeg/FFmpeg.h"
 
#include "ocean/media/Library.h"
#include "ocean/media/Manager.h"
 
namespace Ocean
{
 
namespace Media
{
 
namespace FFmpeg
{
 
/**
 * This class implements the FFmpeg library.
 * @ingroup mediaffm
 */
class FFMLibrary : public Library
{
    friend class Media::Manager;
    friend class FFMMovie;
 
    public:
 
        /**
         * Creates a new medium by a given url.
         * @see Library::newMedium().
         */
        MediumRef newMedium(const std::string& url, bool useExclusive = false) override;
 
        /**
         * Creates a new medium by a given url and an expected type.
         * @see Library::newMedium().
         */
        MediumRef newMedium(const std::string& url, const Medium::Type type, bool useExclusive = false) override;
 
        /**
         * Creates a new recorder specified by the recorder type.
         * @see Library::newRecorder().
         */
        RecorderRef newRecorder(const Recorder::Type type) override;
 
        /**
         * Returns the supported medium types.
         * @see Library::supportedTypes().
         */
        Medium::Type supportedTypes() const override;
 
        /**
         * Registers this library at the global media manager.
         * With each register call, the reference counter for a specific library will be incremented.
         * Each call to registerLibrary() needs to be balanced with a corresponding call of unregisterLibrary() before shutting down.
         * @return True, if the library has not been registered before
         * @see Manager, unregisterLibrary()
         */
        static bool registerLibrary();
 
        /**
         * Unregisters this library at the global media manager.
         * With each unregister call, the reference counter for a specific library will be decremented and removed from the system if the counter reaches zero.
         * Each call to registerLibrary() needs to be balanced with a corresponding call of unregisterLibrary() before shutting down.
         * @return True, if the library was actually removed from the system (as the reference counter reached zero); False, if the library is still used by someone else
         * @see registerLibrary().
         */
        static bool unregisterLibrary();
 
    protected:
 
        /**
         * Creates a new FFMLibrary object.
         */
        FFMLibrary();
 
        /**
         * Destructs an FFMLibrary object.
         */
        ~FFMLibrary() override;
 
        /**
         * Creates this library and returns it an object reference.
         * @return The new library object
         */
        static LibraryRef create();
 
        /**
         * Creates a new movie medium.
         * @param url Url of the movie medium to create
         * @param useExclusive Determines whether the caller would like to use this medium exclusively
         * @return Reference of the new medium
         */
        static MediumRef newMovie(const std::string& url, bool useExclusive);
 
        /**
         * Callback function for FFmpeg's logs.
         * @param context The context of the log
         * @param level The log's level
         * @param message The log message
         * @param arguments The log's arguments
         */
        static void avLogCallback(void* context, int level, const char* message, va_list arguments);
};
 
}
 
}
 
}
 
#endif // META_OCEAN_MEDIA_FFM_FFM_LIBRARY_H