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<HTML
><HEAD
><TITLE
>Audio Examples</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.64
"><LINK
REL="HOME"
TITLE="SDL Library Documentation"
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><TR
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>SDL Library Documentation</TH
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>Prev</A
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>Chapter 4. Examples</TD
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><DIV
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><H1
CLASS="SECT1"
><A
NAME="GUIDEAUDIOEXAMPLES"
>Audio Examples</A
></H1
><P
></P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN382"
>Opening the audio device</A
></H2
><P
><PRE
CLASS="PROGRAMLISTING"
> SDL_AudioSpec wanted;
extern void fill_audio(void *udata, Uint8 *stream, int len);
 
/* Set the audio format */
wanted.freq = 22050;
wanted.format = AUDIO_S16;
wanted.channels = 2; /* 1 = mono, 2 = stereo */
wanted.samples = 1024; /* Good low-latency value for callback */
wanted.callback = fill_audio;
wanted.userdata = NULL;
 
/* Open the audio device, forcing the desired format */
if ( SDL_OpenAudio(&#38;wanted, NULL) &#60; 0 ) {
fprintf(stderr, "Couldn't open audio: %s\n", SDL_GetError());
return(-1);
}
return(0);</PRE
></P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN386"
>Playing audio</A
></H2
><P
><PRE
CLASS="PROGRAMLISTING"
> static Uint8 *audio_chunk;
static Uint32 audio_len;
static Uint8 *audio_pos;
 
/* The audio function callback takes the following parameters:
stream: A pointer to the audio buffer to be filled
len: The length (in bytes) of the audio buffer
*/
void fill_audio(void *udata, Uint8 *stream, int len)
{
/* Only play if we have data left */
if ( audio_len == 0 )
return;
 
/* Mix as much data as possible */
len = ( len &#62; audio_len ? audio_len : len );
SDL_MixAudio(stream, audio_pos, len, SDL_MIX_MAXVOLUME)
audio_pos += len;
audio_len -= len;
}
 
/* Load the audio data ... */
 
;;;;;
 
audio_pos = audio_chunk;
 
/* Let the callback function play the audio chunk */
SDL_PauseAudio(0);
 
/* Do some processing */
 
;;;;;
 
/* Wait for sound to complete */
while ( audio_len &#62; 0 ) {
SDL_Delay(100); /* Sleep 1/10 second */
}
SDL_CloseAudio();</PRE
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>Prev</A
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