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openal 基础知识4

發(fā)布時(shí)間：2024/1/17 编程问答 26 豆豆

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二函數(shù)

1.?buffer函數(shù)

void alGenBuffers(ALsizei n /* buffer數(shù)*/, ALuint * buffers /* buffer ID數(shù)組*/);

void alDeleteBuffers(ALsizei n /* buffer數(shù)*/, ALuint * buffers /* buffer ID?數(shù)組*/);

ALboolean alIsBuffer(ALuint buffer);

//?為buffer填充數(shù)據(jù)

void alBufferData(ALuint buffer, ALenum format/*聲音格式*/,const ALvoid *data/*數(shù)據(jù)地址*/

????????????????????????, ALsizei size/*數(shù)據(jù)字節(jié)數(shù)*/,ALsizei freq/*聲音頻率*/);

????????????????聲音格式:AL_FORMAT_[MONO8, MONO16, STEREO8, STEREO16]

//?設(shè)置buffer的浮點(diǎn)數(shù)屬性

void alBufferf (ALuintbuffer, ALenum param/*屬性名*/,ALfloat value/*屬性值*/);

void alBuffer3f (ALuintbuffer, ALenum param, ALfloat v1, ALfloat v2, ALfloat v3);

void alBufferfv (ALuintbuffer, ALenum param, ALfloat *values);

//?設(shè)置buffer的整數(shù)屬性

void alBufferi (ALuintbuffer, ALenum param, ALint value);

void alBuffer3i (ALuintbuffer, ALenum param, ALint v1, ALint v2, ALint v3);

void alBufferiv (ALuintbuffer, ALenum param, ALint *values);

//?獲取buffer屬性值

void alGetBufferf(ALuint buffer, ALenum param, ALfloat *value);

void alGetBuffer3f(ALuint buffer, ALenum param, ALfloat *v1, ALfloat *v2, ALfloat *v3);

void alGetBufferfv(ALuint buffer, ALenum param, ALfloat *values);

void alGetBufferi(ALuint buffer, ALenum param, ALint *value);

void alGetBuffer3i(ALuint buffer, ALenum param, ALint *v1, ALint *v2, ALint *v3);

void alGetBufferiv(ALuint buffer, ALenum param, ALint *values);

2.?source函數(shù)

void alGenSources(ALsizei n, ALuint *sources);

void alDeleteSources(ALsizei n, ALuint *sources);

ALboolean alIsSource(ALuint source);

void alSourcef (ALuintsource, ALenum param, ALfloat value);

void alSource3f (ALuintsource, ALenum param, ALfloat v1, ALfloat v2, ALfloat v3);

void alSourcefv (ALuintsource, ALenum param, ALfloat *values);

void alSourcei (ALuintsource, ALenum param, ALint value);

void alSource3i (ALuintsource, ALenum param, ALint v1, ALint v2, ALint v3);

void alSourceiv (ALuintsource, ALenum param, ALint *values);

void alGetSourcef(ALuint source, ALenum param, ALfloat *value);

void alGetSource3f(ALuint source, ALenum param, ALfloat *v1, ALfloat *v2, ALfloat *v3);

void alGetSourcefv(ALuint source, ALenum param, ALfloat *values);

void alGetSourcei(ALuint source, ALenum param, ALint *value);

void alGetSource3i(ALuint source, ALenum param, ALint *v1, ALint *v2, ALint *v3);

void alGetSourceiv(ALuint source, ALenum param, ALint *values);

void alSourcePlay(ALuint source);

void alSourcePause(ALuint source);

void alSourceStop(ALuint source);

void alSourceRewind(ALuint source); //停止source并將其狀態(tài)設(shè)置為AL_INITIAL

void alSourcePlayv(ALsizei n, ALuint *sources); //播放一系列source

void alSourcePausev(ALsizei n, ALuint *sources);

void alSourceStopv(ALsizei n, ALuint *sources);

void alSourceRewindv(ALsizei n, ALuint *sources);

voidalSourceQueueBuffers (ALuint source, ALsizei n, ALuint *buffers); //alGetSourcei(source,

????????????????AL_BUFFERS_PROCESSED,&x)獲取已經(jīng)處理了的buffer數(shù)

voidalSourceUnqueueBuffers (ALuint source, ALsizei n, ALuint *buffers);

3.?listener函數(shù)

void alListenerf(ALenum param, ALfloat value);

void alListener3f(ALenum param, ALfloat v1, ALfloat v2, ALfloat v3);

void alListenerfv(ALenum param, ALfloat *values);

void alListeneri(ALenum param, ALint value);

void alListener3i(ALenum param, ALint v1, ALint v2, ALint v3);

void alListeneriv(ALenum param, ALint *values);

void alGetListenerf(ALenum param, ALfloat *value);

void alGetListener3f(ALenum param, ALfloat *v1, ALfloat *v2, ALfloat *v3);

void alGetListenerfv(ALenum param, ALfloat *values);

void alGetListeneri(ALenum param, ALint *value);

void alGetListener3i(ALenum param, ALint *v1, ALint *v2, ALint *v3);

void alGetListeneriv(ALenum param, ALint *values);

4.?狀態(tài)函數(shù)

????????AL_DOPPLER_FACTOR f?全局多普勒系數(shù)

????????AL_SPEED_OF_SOUND f?聲音的每秒傳播速度

????????AL_DISTANCE_MODEL i?距離模型枚舉值

void alEnable (ALenumcapability); //使能某項(xiàng)功能

void alDisable (ALenumcapability);

ALboolean alIsEnabled(ALenum capability);

// FIXME:這一堆不知道是干嗎的。。。

ALboolean alGetBoolean(ALenum param);

ALdouble alGetDouble(ALenum param);

ALfloat alGetFloat(ALenum param);

ALint alGetInteger(ALenum param);

void alGetBooleanv(ALenum param, ALboolean *data);

void alGetDoublev(ALenum param, ALdouble *data);

void alGetFloatv(ALenum param, ALfloat *data);

void alGetIntegerv(ALenum param, ALint *data);

const Alchar *alGetString (ALenum param); // param為

????????????????AL_VENDOR,AL_VERSION, AL_RENDERER, AL_EXTENSIONS

void alDopplerFactor(ALfloat value); //設(shè)置多普勒因子，默認(rèn)1.0

void alSpeedOfSound(ALfloat value); //默認(rèn)343.3

void alDistanceModel(ALenum value); //設(shè)置OpenAL的距離模型

????????????????AL_INVERSE_DISTANCE//倒數(shù)距離

????????????????AL_INVERSE_DISTANCE_CLAMPED//默認(rèn)值

????????????????AL_LINEAR_DISTANCE //線性距離

????????????????AL_LINEAR_DISTANCE_CLAMPED

????????????????AL_EXPONENT_DISTANCE//指數(shù)距離

????????????????AL_EXPONENT_DISTANCE_CLAMPED

????????????????AL_NONE

????????????????//這兩個(gè)參數(shù)是計(jì)算距離中用的，公式參考原版文檔，總之越近增益越大

????????????????AL_REFERENCE_DISTANCE//參考距離

????????????????AL_ROLLOFF_FACTOR //衰減因子

5.?錯(cuò)誤函數(shù)

ALenum alGetError(ALvoid);

6.?extension函數(shù)

ALbooleanalIsExtensionPresent (const ALchar *extname); //extension有效時(shí)返回AL_TRUE

void * alGetProcAddress(const ALchar *fname); //返回指定的函數(shù)指針或者NULL

ALenum alGetEnumValue(const ALchar *ename); //返回ename描述的ALenum或者NULL

7.?context函數(shù)

ALC_FREQUENCY l?輸出頻率

ALC_MONO_SOURCES l?請(qǐng)求的單聲道source數(shù)

ALC_STEREO_SOURCES l?請(qǐng)求的雙聲道source數(shù)

ALC_REFRESH l context運(yùn)行的刷新率

ALC_SYNC i?同步context的標(biāo)志位

ALContext *alcCreateContext (ALCdevice *device, ALCint *attrlist);

????????????????attrlist:上述屬性集的指針，可以是NULL或以0結(jié)尾的列表，列表中每一項(xiàng)是屬性名和屬性值組成的數(shù)對(duì)

ALCbooleanalcMakeContextCurrent (ALCcontext *context);

void alcProcessContext(ALCcontext *context); //通知指定context開始運(yùn)行

void alcSuspendContext(ALCcontext *context); //這兩個(gè)組合使用可以使?fàn)顟B(tài)的改變迅速生效

void alcDestroyContext(ALCcontext *context); //關(guān)閉非當(dāng)前的context

ALCcontext*alcGetCurrentContext (ALCvoid);

ALCdevice*alcGetContextDevice (ALCcontext *context);

8.?context錯(cuò)誤函數(shù)

ALCenum alcGetError(ALCdevice *device);

9.?contextdevice函數(shù)

ALCdevice*alcOpenDevice (const ALCchar *devicename);

ALCbooleanalcCloseDevice (ALCdevice *device);

10.?contextextension函數(shù)

ALCbooleanalcIsExtensionPresent (ALCdevice *device, const ALCchar *extName);

void* alcGetProcAddress(ALCdevice *device, const ALCchar *funcName);

ALCenum alcGetEnumValue(ALCdevice *device, const ALCchar *enumName);

11.?context狀態(tài)函數(shù)

const ALCchar *alcGetString (ALCdevice *device, ALenum param);

????????????????屬性：?ALC_DEFAULT_DEVICE_SPECIFIER

????????????????????????ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER

????????????????????????ALC_DEVICE_SPECIFIER

????????????????????????ALC_CAPTURE_DEVICE_SPECIFIER

????????????????????????ALC_EXTENSIONS

void alcGetIntegerv(ALCdevice *device, ALCenum param, ALCsizei size, ALCint *data);

????????????????param: ALC_MAJOR_VERSION,ALC_MINOR_VERSION,

????????????????????????ALC_ATTRIBUTES_SIZE,ALC_ALL_ATTRIBUTES

????????????????size:?傳入的目標(biāo)buffer的大小

12.?context?捕捉函數(shù)

ALCdevice*alcCaptureOpenDevice (const ALCchar *devicename, ALCuint frequency, ALCenum format,ALCsizei buffersize);

???????? ???????? frequency:?捕捉的頻率

ALCbooleanalcCaptureCloseDevice (ALCdevice *device);

void alcCaptureStart(ALCdevice *device); //啟動(dòng)捕捉，數(shù)據(jù)存入一個(gè)內(nèi)部環(huán)形buffer，buffer大小是opendevice時(shí)候傳入。通過alcGetIntegerv和ALC_CAPTURE_SAMPLES可以獲得當(dāng)前有效采樣數(shù)，然后可用alcCaptureSamples獲得已經(jīng)采樣的樣本。

void alcCaptureStop(ALCdevice *device);

void alcCaptureSamples(ALCdevice *device, ALCvoid *buffer, ALCsizei samples);

轉(zhuǎn)載于:https://www.cnblogs.com/dragon2012/p/3229048.html

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