预定义常量
下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。
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ALC_FREQUENCY( integer) - Context Attribute
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ALC_REFRESH( integer) - Context Attribute
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ALC_SYNC( integer) - Context Attribute
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AL_FREQUENCY( integer) - Buffer Setting
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AL_BITS( integer) - Buffer Setting
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AL_CHANNELS( integer) - Buffer Setting
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AL_SIZE( integer) - Buffer Setting
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AL_BUFFER( integer) - Source/Listener Setting (Integer)
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AL_SOURCE_RELATIVE( integer) - Source/Listener Setting (Integer)
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AL_SOURCE_STATE( integer) - Source/Listener Setting (Integer)
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AL_PITCH( integer) - Source/Listener Setting (Float)
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AL_GAIN( integer) - Source/Listener Setting (Float)
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AL_MIN_GAIN( integer) - Source/Listener Setting (Float)
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AL_MAX_GAIN( integer) - Source/Listener Setting (Float)
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AL_MAX_DISTANCE( integer) - Source/Listener Setting (Float)
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AL_ROLLOFF_FACTOR( integer) - Source/Listener Setting (Float)
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AL_CONE_OUTER_GAIN( integer) - Source/Listener Setting (Float)
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AL_CONE_INNER_ANGLE( integer) - Source/Listener Setting (Float)
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AL_CONE_OUTER_ANGLE( integer) - Source/Listener Setting (Float)
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AL_REFERENCE_DISTANCE( integer) - Source/Listener Setting (Float)
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AL_POSITION( integer) - Source/Listener Setting (Float Vector)
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AL_VELOCITY( integer) - Source/Listener Setting (Float Vector)
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AL_DIRECTION( integer) - Source/Listener Setting (Float Vector)
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AL_ORIENTATION( integer) - Source/Listener Setting (Float Vector)
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AL_FORMAT_MONO8( integer) - PCM Format
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AL_FORMAT_MONO16( integer) - PCM Format
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AL_FORMAT_STEREO8( integer) - PCM Format
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AL_FORMAT_STEREO16( integer) - PCM Format
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AL_INITIAL( integer) - Source State
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AL_PLAYING( integer) - Source State
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AL_PAUSED( integer) - Source State
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AL_STOPPED( integer) - Source State
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AL_LOOPING( integer) - Source State
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AL_TRUE( integer) - Boolean value recognized by OpenAL
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AL_FALSE( integer) - Boolean value recognized by OpenAL
