symbian-qemu-0.9.1-12/libsdl-trunk/docs/html/guideaudioexamples.html
author johnathan.white@2718R8BGH51.accenture.com
Mon, 08 Mar 2010 18:45:03 +0000
changeset 46 b6935a90ca64
parent 1 2fb8b9db1c86
permissions -rw-r--r--
Modify framebuffer and NGA framebuffer to read screen size from board model dtb file. Optimise memory usuage of frame buffer Add example minigui application with hooks to profiler (which writes results to S:\). Modified NGA framebuffer to run its own dfc queue at high priority
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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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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   135
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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        /* Mix as much data as possible */
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   137
        len = ( len &#62; audio_len ? audio_len : len );
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   138
        SDL_MixAudio(stream, audio_pos, len, SDL_MIX_MAXVOLUME);
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   139
        audio_pos += len;
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        audio_len -= len;
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   141
    }
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2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   143
    /* Load the audio data ... */
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   144
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   145
    ;;;;;
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   146
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   147
    audio_pos = audio_chunk;
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   148
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   149
    /* Let the callback function play the audio chunk */
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   150
    SDL_PauseAudio(0);
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   151
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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    /* Do some processing */
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   153
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   154
    ;;;;;
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   155
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   156
    /* Wait for sound to complete */
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   157
    while ( audio_len &#62; 0 ) {
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   158
        SDL_Delay(100);         /* Sleep 1/10 second */
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   159
    }
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   160
    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"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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><HR
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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ALIGN="LEFT"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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WIDTH="100%"><TABLE
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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SUMMARY="Footer navigation table"
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WIDTH="100%"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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BORDER="0"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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CELLPADDING="0"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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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"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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VALIGN="top"
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><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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HREF="guideeventexamples.html"
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ACCESSKEY="P"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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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
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   189
HREF="index.html"
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ACCESSKEY="H"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>Home</A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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></TD
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><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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WIDTH="33%"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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ALIGN="right"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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VALIGN="top"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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HREF="guidecdromexamples.html"
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ACCESSKEY="N"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>Next</A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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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"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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VALIGN="top"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>Event Examples</TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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><TD
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WIDTH="34%"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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ALIGN="center"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   212
VALIGN="top"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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HREF="guideexamples.html"
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ACCESSKEY="U"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>Up</A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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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"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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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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>