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/**
* @file audioengine_openal.cpp
* @brief implementation of audio engine using OpenAL
* support as a OpenAL 3D implementation
*
*
* $LicenseInfo:firstyear=2002&license=viewergpl$
*
* Copyright (c) 2002-2009, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at
* http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#ifndef LL_AUDIOENGINE_OPENAL_H
#define LL_AUDIOENGINE_OPENAL_H
#include "llaudioengine.h"
#include "lllistener_openal.h"
#include "llwindgen.h"
class LLAudioEngine_OpenAL : public LLAudioEngine
{
public:
LLAudioEngine_OpenAL();
virtual ~LLAudioEngine_OpenAL();
virtual bool init(const S32 num_channels, void *user_data);
virtual std::string getDriverName(bool verbose);
virtual void allocateListener();
virtual void shutdown();
void setInternalGain(F32 gain);
LLAudioBuffer* createBuffer();
LLAudioChannel* createChannel();
/*virtual*/ void initWind();
/*virtual*/ void cleanupWind();
/*virtual*/ void updateWind(LLVector3 direction, F32 camera_altitude);
private:
void * windDSP(void *newbuffer, int length);
typedef S16 WIND_SAMPLE_T;
LLWindGen<WIND_SAMPLE_T> *mWindGen;
S16 *mWindBuf;
U32 mWindBufFreq;
U32 mWindBufSamples;
U32 mWindBufBytes;
ALuint mWindSource;
int mNumEmptyWindALBuffers;
static const int MAX_NUM_WIND_BUFFERS = 80;
static const float WIND_BUFFER_SIZE_SEC = 0.05f; // 1/20th sec
};
class LLAudioChannelOpenAL : public LLAudioChannel
{
public:
LLAudioChannelOpenAL();
virtual ~LLAudioChannelOpenAL();
protected:
/*virtual*/ void play();
/*virtual*/ void playSynced(LLAudioChannel *channelp);
/*virtual*/ void cleanup();
/*virtual*/ bool isPlaying();
/*virtual*/ bool updateBuffer();
/*virtual*/ void update3DPosition();
/*virtual*/ void updateLoop();
ALuint mALSource;
ALint mLastSamplePos;
};
class LLAudioBufferOpenAL : public LLAudioBuffer{
public:
LLAudioBufferOpenAL();
virtual ~LLAudioBufferOpenAL();
bool loadWAV(const std::string& filename);
U32 getLength();
friend class LLAudioChannelOpenAL;
protected:
void cleanup();
ALuint getBuffer() {return mALBuffer;}
ALuint mALBuffer;
};
#endif
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