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symbian-qemu-0.9.1-12/libsdl-trunk/docs/html/guideaudioexamples.html
author martin.trojer@nokia.com
Fri, 31 Jul 2009 15:01:17 +0100
changeset 1 2fb8b9db1c86
permissions -rw-r--r--
Initial QEMU (symbian-qemu-0.9.1-12) import
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<HTML
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><HEAD
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><TITLE
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>Audio Examples</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
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"><LINK
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REL="HOME"
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TITLE="SDL Library Documentation"
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HREF="index.html"><LINK
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REL="UP"
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TITLE="Examples"
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HREF="guideexamples.html"><LINK
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REL="PREVIOUS"
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TITLE="Event Examples"
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HREF="guideeventexamples.html"><LINK
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REL="NEXT"
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TITLE="CDROM Examples"
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HREF="guidecdromexamples.html"></HEAD
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><BODY
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CLASS="SECT1"
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BGCOLOR="#FFF8DC"
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TEXT="#000000"
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LINK="#0000ee"
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VLINK="#551a8b"
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ALINK="#ff0000"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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SUMMARY="Header navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>SDL Library Documentation</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="guideeventexamples.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Chapter 4. Examples</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="guidecdromexamples.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="GUIDEAUDIOEXAMPLES"
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></A
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>Audio Examples</H1
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><P
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></P
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN382"
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></A
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>Opening the audio device</H2
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><P
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><PRE
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CLASS="PROGRAMLISTING"
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>    SDL_AudioSpec wanted;
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    extern void fill_audio(void *udata, Uint8 *stream, int len);
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    /* Set the audio format */













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    wanted.freq = 22050;













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    wanted.format = AUDIO_S16;













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    wanted.channels = 2;    /* 1 = mono, 2 = stereo */













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    wanted.samples = 1024;  /* Good low-latency value for callback */













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    wanted.callback = fill_audio;













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    wanted.userdata = NULL;













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    /* Open the audio device, forcing the desired format */













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    if ( SDL_OpenAudio(&#38;wanted, NULL) &#60; 0 ) {













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        fprintf(stderr, "Couldn't open audio: %s\n", SDL_GetError());













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        return(-1);













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    }













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    return(0);</PRE













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></P













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></DIV













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><DIV













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CLASS="SECT2"













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><H2













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CLASS="SECT2"













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><A













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NAME="AEN386"













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></A













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>Playing audio</H2













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><P













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><PRE













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CLASS="PROGRAMLISTING"













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>    static Uint8 *audio_chunk;













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    static Uint32 audio_len;













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    static Uint8 *audio_pos;













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    /* The audio function callback takes the following parameters:













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       stream:  A pointer to the audio buffer to be filled













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       len:     The length (in bytes) of the audio buffer













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    */













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    void fill_audio(void *udata, Uint8 *stream, int len)













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    {













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        /* Only play if we have data left */













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        if ( audio_len == 0 )













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            return;













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        /* Mix as much data as possible */













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        len = ( len &#62; audio_len ? audio_len : len );













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        SDL_MixAudio(stream, audio_pos, len, SDL_MIX_MAXVOLUME);













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        audio_pos += len;













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        audio_len -= len;













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    }













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    /* Load the audio data ... */













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    ;;;;;













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    audio_pos = audio_chunk;













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    /* Let the callback function play the audio chunk */













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    SDL_PauseAudio(0);













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    /* Do some processing */













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    ;;;;;













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    /* Wait for sound to complete */













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    while ( audio_len &#62; 0 ) {













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        SDL_Delay(100);         /* Sleep 1/10 second */













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    }













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    SDL_CloseAudio();</PRE













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></P













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></DIV













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></DIV













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><DIV













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CLASS="NAVFOOTER"













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><HR













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ALIGN="LEFT"













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WIDTH="100%"><TABLE













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SUMMARY="Footer navigation table"













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WIDTH="100%"













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BORDER="0"













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CELLPADDING="0"













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CELLSPACING="0"













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><TR













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><TD













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WIDTH="33%"













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ALIGN="left"













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VALIGN="top"













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><A













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HREF="guideeventexamples.html"













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ACCESSKEY="P"













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>Prev</A













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></TD













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><TD













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WIDTH="34%"













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ALIGN="center"













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VALIGN="top"













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><A













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HREF="index.html"













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ACCESSKEY="H"













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>Home</A













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   192


></TD













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><TD













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WIDTH="33%"













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ALIGN="right"













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VALIGN="top"













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><A













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HREF="guidecdromexamples.html"













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ACCESSKEY="N"













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>Next</A













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></TD













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></TR













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><TR













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><TD













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WIDTH="33%"













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ALIGN="left"













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VALIGN="top"













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>Event Examples</TD













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><TD













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WIDTH="34%"













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ALIGN="center"













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VALIGN="top"













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><A













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HREF="guideexamples.html"













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ACCESSKEY="U"













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>Up</A













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></TD













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><TD













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WIDTH="33%"













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ALIGN="right"













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VALIGN="top"













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>CDROM Examples</TD













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></TR













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></TABLE













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></DIV













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></BODY













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></HTML













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>














FCL/interim/QEMU