author | martin.trojer@nokia.com |
Fri, 31 Jul 2009 15:01:17 +0100 | |
changeset 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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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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|
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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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|
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/* Open the audio device, forcing the desired format */ |
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if ( SDL_OpenAudio(&wanted, NULL) < 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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113 |
><H2 |
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114 |
CLASS="SECT2" |
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115 |
><A |
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116 |
NAME="AEN386" |
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117 |
></A |
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118 |
>Playing audio</H2 |
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119 |
><P |
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120 |
><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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125 |
|
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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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128 |
len: The length (in bytes) of the audio buffer |
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129 |
*/ |
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void fill_audio(void *udata, Uint8 *stream, int len) |
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131 |
{ |
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132 |
/* Only play if we have data left */ |
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133 |
if ( audio_len == 0 ) |
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134 |
return; |
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135 |
|
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136 |
/* Mix as much data as possible */ |
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len = ( len > audio_len ? audio_len : len ); |
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SDL_MixAudio(stream, audio_pos, len, SDL_MIX_MAXVOLUME); |
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139 |
audio_pos += len; |
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140 |
audio_len -= len; |
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141 |
} |
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|
142 |
|
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143 |
/* Load the audio data ... */ |
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|
144 |
|
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145 |
;;;;; |
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|
146 |
|
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147 |
audio_pos = audio_chunk; |
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|
148 |
|
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149 |
/* Let the callback function play the audio chunk */ |
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150 |
SDL_PauseAudio(0); |
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|
151 |
|
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|
152 |
/* Do some processing */ |
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|
153 |
|
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154 |
;;;;; |
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|
155 |
|
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156 |
/* Wait for sound to complete */ |
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157 |
while ( audio_len > 0 ) { |
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158 |
SDL_Delay(100); /* Sleep 1/10 second */ |
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|
159 |
} |
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|
160 |
SDL_CloseAudio();</PRE |
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|
161 |
></P |
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|
162 |
></DIV |
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|
163 |
></DIV |
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|
164 |
><DIV |
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|
165 |
CLASS="NAVFOOTER" |
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|
166 |
><HR |
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|
167 |
ALIGN="LEFT" |
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|
168 |
WIDTH="100%"><TABLE |
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|
169 |
SUMMARY="Footer navigation table" |
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|
170 |
WIDTH="100%" |
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|
171 |
BORDER="0" |
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|
172 |
CELLPADDING="0" |
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|
173 |
CELLSPACING="0" |
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|
174 |
><TR |
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|
175 |
><TD |
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|
176 |
WIDTH="33%" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
177 |
ALIGN="left" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
178 |
VALIGN="top" |
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|
179 |
><A |
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|
180 |
HREF="guideeventexamples.html" |
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|
181 |
ACCESSKEY="P" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
182 |
>Prev</A |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
183 |
></TD |
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|
184 |
><TD |
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|
185 |
WIDTH="34%" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
186 |
ALIGN="center" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
187 |
VALIGN="top" |
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|
188 |
><A |
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|
189 |
HREF="index.html" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
190 |
ACCESSKEY="H" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
191 |
>Home</A |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
192 |
></TD |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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diff
changeset
|
193 |
><TD |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
194 |
WIDTH="33%" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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changeset
|
195 |
ALIGN="right" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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changeset
|
196 |
VALIGN="top" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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changeset
|
197 |
><A |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
198 |
HREF="guidecdromexamples.html" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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diff
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|
199 |
ACCESSKEY="N" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
200 |
>Next</A |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
201 |
></TD |
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|
202 |
></TR |
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|
203 |
><TR |
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|
204 |
><TD |
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|
205 |
WIDTH="33%" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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changeset
|
206 |
ALIGN="left" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
207 |
VALIGN="top" |
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|
208 |
>Event Examples</TD |
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|
209 |
><TD |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
210 |
WIDTH="34%" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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changeset
|
211 |
ALIGN="center" |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
212 |
VALIGN="top" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
213 |
><A |
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|
214 |
HREF="guideexamples.html" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
215 |
ACCESSKEY="U" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
216 |
>Up</A |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
217 |
></TD |
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|
218 |
><TD |
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|
219 |
WIDTH="33%" |
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|
220 |
ALIGN="right" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
221 |
VALIGN="top" |
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|
222 |
>CDROM Examples</TD |
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|
223 |
></TR |
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|
224 |
></TABLE |
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|
225 |
></DIV |
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|
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></BODY |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
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227 |
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2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
228 |
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