Aegisub/aegisub/audio_player_openal.h

// Copyright (c) 2007, Niels Martin Hansen
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//   * Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//   * Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//   * Neither the name of the Aegisub Group nor the names of its contributors
//     may be used to endorse or promote products derived from this software
//     without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// -----------------------------------------------------------------------------
//
// AEGISUB
//
// Website: http://aegisub.cellosoft.com
// Contact: mailto:jiifurusu@gmail.com
//


#ifdef WITH_OPENAL


///////////
// Headers
#include <wx/wxprec.h>
#include "audio_player.h"
#include "audio_provider.h"
#include "utils.h"
#include "main.h"
#include "frame_main.h"
#include "audio_player.h"
#include "options.h"
#ifdef __APPLE__
#include <OpenAL/AL.h>
#include <OpenAL/ALC.h>
#else
#include <al.h>
#include <alc.h>
#endif


/////////////////
// OpenAL player
class OpenALPlayer : public AudioPlayer, wxTimer {
private:
	bool open;
	volatile bool playing;
	volatile float volume;

	static const ALsizei num_buffers = 8;
	ALsizei buffer_length;
	ALsizei samplerate;

	volatile unsigned long start_frame; // first frame of playback
	volatile unsigned long cur_frame; // last written frame + 1
	volatile unsigned long end_frame; // last frame to play
	unsigned long bpf; // bytes per frame

	AudioProvider *provider;
	ALCdevice *device; // device handle
	ALCcontext *context; // sound context
	ALuint buffers[num_buffers]; // sound buffers
	ALuint source; // playback source

	ALsizei buf_first_free; // index into buffers, first free (unqueued) buffer
	ALsizei buf_first_queued; // index into buffers, first queued (non-free) buffer
	ALsizei buffers_free; // number of free buffers
	ALsizei buffers_played;
	wxStopWatch playback_segment_timer;

	void FillBuffers(ALsizei count);

protected:
	void Notify(); // from wxTimer

public:
	OpenALPlayer();
	~OpenALPlayer();

	void OpenStream();
	void CloseStream();

	void Play(int64_t start,int64_t count);
	void Stop(bool timerToo=true);
	bool IsPlaying();

	int64_t GetStartPosition();
	int64_t GetEndPosition();
	int64_t GetCurrentPosition();
	void SetEndPosition(int64_t pos);
	void SetCurrentPosition(int64_t pos);

	void SetVolume(double vol) { volume = vol; }
	double GetVolume() { return volume; }
};



///////////
// Factory
class OpenALPlayerFactory : public AudioPlayerFactory {
public:
	AudioPlayer *CreatePlayer() { return new OpenALPlayer(); }
	OpenALPlayerFactory() : AudioPlayerFactory(_T("openal")) {}
};

#endif