llaudioengine_openal.h
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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) 2002-2010, 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