| <HTML |
| ><HEAD |
| ><TITLE |
| >SDL_MixAudio</TITLE |
| ><META |
| NAME="GENERATOR" |
| CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ |
| "><LINK |
| REL="HOME" |
| TITLE="SDL Library Documentation" |
| HREF="index.html"><LINK |
| REL="UP" |
| TITLE="Audio" |
| HREF="audio.html"><LINK |
| REL="PREVIOUS" |
| TITLE="SDL_ConvertAudio" |
| HREF="sdlconvertaudio.html"><LINK |
| REL="NEXT" |
| TITLE="SDL_LockAudio" |
| HREF="sdllockaudio.html"></HEAD |
| ><BODY |
| CLASS="REFENTRY" |
| BGCOLOR="#FFF8DC" |
| TEXT="#000000" |
| LINK="#0000ee" |
| VLINK="#551a8b" |
| ALINK="#ff0000" |
| ><DIV |
| CLASS="NAVHEADER" |
| ><TABLE |
| SUMMARY="Header navigation table" |
| WIDTH="100%" |
| BORDER="0" |
| CELLPADDING="0" |
| CELLSPACING="0" |
| ><TR |
| ><TH |
| COLSPAN="3" |
| ALIGN="center" |
| >SDL Library Documentation</TH |
| ></TR |
| ><TR |
| ><TD |
| WIDTH="10%" |
| ALIGN="left" |
| VALIGN="bottom" |
| ><A |
| HREF="sdlconvertaudio.html" |
| ACCESSKEY="P" |
| >Prev</A |
| ></TD |
| ><TD |
| WIDTH="80%" |
| ALIGN="center" |
| VALIGN="bottom" |
| ></TD |
| ><TD |
| WIDTH="10%" |
| ALIGN="right" |
| VALIGN="bottom" |
| ><A |
| HREF="sdllockaudio.html" |
| ACCESSKEY="N" |
| >Next</A |
| ></TD |
| ></TR |
| ></TABLE |
| ><HR |
| ALIGN="LEFT" |
| WIDTH="100%"></DIV |
| ><H1 |
| ><A |
| NAME="SDLMIXAUDIO" |
| ></A |
| >SDL_MixAudio</H1 |
| ><DIV |
| CLASS="REFNAMEDIV" |
| ><A |
| NAME="AEN7107" |
| ></A |
| ><H2 |
| >Name</H2 |
| >SDL_MixAudio -- Mix audio data</DIV |
| ><DIV |
| CLASS="REFSYNOPSISDIV" |
| ><A |
| NAME="AEN7110" |
| ></A |
| ><H2 |
| >Synopsis</H2 |
| ><DIV |
| CLASS="FUNCSYNOPSIS" |
| ><A |
| NAME="AEN7111" |
| ></A |
| ><P |
| ></P |
| ><PRE |
| CLASS="FUNCSYNOPSISINFO" |
| >#include "SDL.h"</PRE |
| ><P |
| ><CODE |
| ><CODE |
| CLASS="FUNCDEF" |
| >void <B |
| CLASS="FSFUNC" |
| >SDL_MixAudio</B |
| ></CODE |
| >(Uint8 *dst, Uint8 *src, Uint32 len, int volume);</CODE |
| ></P |
| ><P |
| ></P |
| ></DIV |
| ></DIV |
| ><DIV |
| CLASS="REFSECT1" |
| ><A |
| NAME="AEN7117" |
| ></A |
| ><H2 |
| >Description</H2 |
| ><P |
| >This function takes two audio buffers of <TT |
| CLASS="PARAMETER" |
| ><I |
| >len</I |
| ></TT |
| > bytes each |
| of the playing audio format and mixes them, performing addition, volume |
| adjustment, and overflow clipping. The <TT |
| CLASS="PARAMETER" |
| ><I |
| >volume</I |
| ></TT |
| > ranges |
| from 0 to <TT |
| CLASS="LITERAL" |
| >SDL_MIX_MAXVOLUME</TT |
| > and should be set to the maximum |
| value for full audio volume. Note this does not change hardware volume. This is |
| provided for convenience -- you can mix your own audio data.</P |
| ><DIV |
| CLASS="NOTE" |
| ><BLOCKQUOTE |
| CLASS="NOTE" |
| ><P |
| ><B |
| >Note: </B |
| >Do not use this function for mixing together more than two streams of sample |
| data. The output from repeated application of this function may be distorted |
| by clipping, because there is no accumulator with greater range than the |
| input (not to mention this being an inefficient way of doing it). |
| Use mixing functions from SDL_mixer, OpenAL, or write your own mixer instead.</P |
| ></BLOCKQUOTE |
| ></DIV |
| ></DIV |
| ><DIV |
| CLASS="REFSECT1" |
| ><A |
| NAME="AEN7125" |
| ></A |
| ><H2 |
| >See Also</H2 |
| ><P |
| ><A |
| HREF="sdlopenaudio.html" |
| ><TT |
| CLASS="FUNCTION" |
| >SDL_OpenAudio</TT |
| ></A |
| ></P |
| ></DIV |
| ><DIV |
| CLASS="NAVFOOTER" |
| ><HR |
| ALIGN="LEFT" |
| WIDTH="100%"><TABLE |
| SUMMARY="Footer navigation table" |
| WIDTH="100%" |
| BORDER="0" |
| CELLPADDING="0" |
| CELLSPACING="0" |
| ><TR |
| ><TD |
| WIDTH="33%" |
| ALIGN="left" |
| VALIGN="top" |
| ><A |
| HREF="sdlconvertaudio.html" |
| ACCESSKEY="P" |
| >Prev</A |
| ></TD |
| ><TD |
| WIDTH="34%" |
| ALIGN="center" |
| VALIGN="top" |
| ><A |
| HREF="index.html" |
| ACCESSKEY="H" |
| >Home</A |
| ></TD |
| ><TD |
| WIDTH="33%" |
| ALIGN="right" |
| VALIGN="top" |
| ><A |
| HREF="sdllockaudio.html" |
| ACCESSKEY="N" |
| >Next</A |
| ></TD |
| ></TR |
| ><TR |
| ><TD |
| WIDTH="33%" |
| ALIGN="left" |
| VALIGN="top" |
| >SDL_ConvertAudio</TD |
| ><TD |
| WIDTH="34%" |
| ALIGN="center" |
| VALIGN="top" |
| ><A |
| HREF="audio.html" |
| ACCESSKEY="U" |
| >Up</A |
| ></TD |
| ><TD |
| WIDTH="33%" |
| ALIGN="right" |
| VALIGN="top" |
| >SDL_LockAudio</TD |
| ></TR |
| ></TABLE |
| ></DIV |
| ></BODY |
| ></HTML |
| > |
