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>Chapter 10. Audio</A
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><B
>Table of Contents</B
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><DT
><A
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>SDL_AudioSpec</A
> &#8212; Audio Specification Structure</DT
><DT
><A
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>SDL_OpenAudio</A
> &#8212; Opens the audio device with the desired parameters.</DT
><DT
><A
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>SDL_PauseAudio</A
> &#8212; Pauses and unpauses the audio callback processing</DT
><DT
><A
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>SDL_GetAudioStatus</A
> &#8212; Get the current audio state</DT
><DT
><A
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>SDL_LoadWAV</A
> &#8212; Load a WAVE file</DT
><DT
><A
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>SDL_FreeWAV</A
> &#8212; Frees previously opened WAV data</DT
><DT
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>SDL_AudioCVT</A
> &#8212; Audio Conversion Structure</DT
><DT
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>SDL_BuildAudioCVT</A
> &#8212; Initializes a SDL_AudioCVT structure for conversion</DT
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>SDL_ConvertAudio</A
> &#8212; Convert audio data to a desired audio format.</DT
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>SDL_MixAudio</A
> &#8212; Mix audio data</DT
><DT
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>SDL_LockAudio</A
> &#8212; Lock out the callback function</DT
><DT
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>SDL_UnlockAudio</A
> &#8212; Unlock the callback function</DT
><DT
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>SDL_CloseAudio</A
> &#8212; Shuts down audio processing and closes the audio device.</DT
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><P
>Sound on the computer is translated from waves that you hear into a series of
values, or samples, each representing the amplitude of the wave.  When these
samples are sent in a stream to a sound card, an approximation of the original
wave can be recreated.  The more bits used to represent the amplitude, and the
greater frequency these samples are gathered, the closer the approximated
sound is to the original, and the better the quality of sound.</P
><P
>This library supports both 8 and 16 bit signed and unsigned sound samples,
at frequencies ranging from 11025 Hz to 44100 Hz, depending on the
underlying hardware.  If the hardware doesn't support the desired audio
format or frequency, it can be emulated if desired (See
<A
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><TT
CLASS="FUNCTION"
>SDL_OpenAudio()</TT
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>)</P
><P
>A commonly supported audio format is 16 bits per sample at 22050 Hz.</P
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author	Sam Lantinga <slouken@lokigames.com>
date	Sat, 16 Jun 2001 06:43:44 +0000
parents	55f1f1b3e27d
children	355632dca928