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//
// libavg - Media Playback Engine.
// Copyright (C) 2003-2014 Ulrich von Zadow
//
// This library 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 2 of the License, or (at your option) any later version.
//
// This library 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 this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// Current versions can be found at www.libavg.de
//
// Original author of this file is Nick Hebner (hebnern@gmail.com).
//
#ifndef _AudioEngine_H_
#define _AudioEngine_H_
#include "../api.h"
#include "AudioSource.h"
#include "AudioParams.h"
#include "AudioBuffer.h"
#include "IProcessor.h"
#include <SDL/SDL.h>
#include <boost/thread/mutex.hpp>
#include <map>
namespace avg {
typedef std::map<int, AudioSourcePtr> AudioSourceMap;
class AVG_API AudioEngine
{
public:
static AudioEngine* get();
AudioEngine();
virtual ~AudioEngine();
int getChannels();
int getSampleRate();
const AudioParams * getParams();
void setAudioEnabled(bool bEnabled);
void init(const AudioParams& ap, float volume);
void teardown();
void play();
void pause();
int addSource(AudioMsgQueue& dataQ, AudioMsgQueue& statusQ);
void removeSource(int id);
void pauseSource(int id);
void playSource(int id);
void notifySeek(int id);
void setSourceVolume(int id, float volume);
void setVolume(float volume);
float getVolume() const;
bool isEnabled() const;
private:
void mixAudio(Uint8 *pDestBuffer, int destBufferLen);
static void audioCallback(void *userData, Uint8 *audioBuffer, int audioBufferLen);
void addBuffers(float *pDest, AudioBufferPtr pSrc);
void calcVolume(float *pBuffer, int numSamples, float volume);
AudioParams m_AP;
AudioBufferPtr m_pTempBuffer;
float * m_pMixBuffer;
IProcessor<float>* m_pLimiter;
boost::mutex m_Mutex;
bool m_bEnabled;
AudioSourceMap m_AudioSources;
float m_Volume;
static AudioEngine* s_pInstance;
};
}
#endif
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