libopenshot-dev 0.1.9+dfsg1-3build1 / usr / include / libopenshot / AudioPlaybackThread.h

/**
 * @file
 * @brief Source file for AudioPlaybackThread class
 * @author Duzy Chan <code@duzy.info>
 * @author Jonathan Thomas <jonathan@openshot.org>
 *
 * @section LICENSE
 *
 * Copyright (c) 2008-2014 OpenShot Studios, LLC
 * <http://www.openshotstudios.com/>. This file is part of
 * OpenShot Library (libopenshot), an open-source project dedicated to
 * delivering high quality video editing and animation solutions to the
 * world. For more information visit <http://www.openshot.org/>.
 *
 * OpenShot Library (libopenshot) is free software: you can redistribute it
 * and/or modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * OpenShot Library (libopenshot) is distributed in the hope that it will be
 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with OpenShot Library. If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef OPENSHOT_AUDIO_PLAYBACK_THREAD_H
#define OPENSHOT_AUDIO_PLAYBACK_THREAD_H

#include "../../include/ReaderBase.h"
#include "../../include/RendererBase.h"
#include "../../include/AudioReaderSource.h"

namespace openshot
{
    using juce::Thread;
    using juce::WaitableEvent;

	struct SafeTimeSliceThread : TimeSliceThread
	{
		SafeTimeSliceThread(const String & s) : TimeSliceThread(s) {}
		void run()
		{
			try {
				TimeSliceThread::run();
			} catch (const TooManySeeks & e) {
				// ...
			}
		}
	};

	/**
	 *  @brief Singleton wrapper for AudioDeviceManager (to prevent multiple instances).
	 */
	class AudioDeviceManagerSingleton {
	private:
		/// Default constructor (Don't allow user to create an instance of this singleton)
		AudioDeviceManagerSingleton(){};

		/// Private variable to keep track of singleton instance
		static AudioDeviceManagerSingleton * m_pInstance;

	public:
		/// Create or get an instance of this singleton (invoke the class with this method)
		static AudioDeviceManagerSingleton * Instance(int numChannels);

		/// Public device manager property
		AudioDeviceManager audioDeviceManager;

		/// Close audio device
		void CloseAudioDevice();
	};

    /**
     *  @brief The audio playback thread
     */
    class AudioPlaybackThread : Thread
    {
	AudioSourcePlayer player;
	AudioTransportSource transport;
	MixerAudioSource mixer;
	AudioReaderSource *source;
	double sampleRate;
	int numChannels;
	WaitableEvent play;
	WaitableEvent played;
	int buffer_size;
	bool is_playing;
	SafeTimeSliceThread time_thread;
	
	/// Constructor
	AudioPlaybackThread();
	/// Destructor
	~AudioPlaybackThread();

	/// Set the current thread's reader
	void Reader(ReaderBase *reader);

	/// Get the current frame object (which is filling the buffer)
	std::shared_ptr<Frame> getFrame();

	/// Get the current frame number being played
	int64_t getCurrentFramePosition();

	/// Play the audio
	void Play();

	/// Seek the audio thread
	void Seek(int64_t new_position);

	/// Stop the audio playback
	void Stop();

	/// Start thread
	void run();
	
    /// Set Speed (The speed and direction to playback a reader (1=normal, 2=fast, 3=faster, -1=rewind, etc...)
    void setSpeed(int new_speed) { if (source) source->setSpeed(new_speed); }

    /// Get Speed (The speed and direction to playback a reader (1=normal, 2=fast, 3=faster, -1=rewind, etc...)
    int getSpeed() const { if (source) return source->getSpeed(); else return 1; }

	friend class PlayerPrivate;
	friend class QtPlayer;
    };

}

#endif // OPENSHOT_AUDIO_PLAYBACK_THREAD_H