symbian-qemu-0.9.1-12/libsdl-trunk/docs/html/audio.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</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="SDL Reference"
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HREF="reference.html"><LINK
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REL="PREVIOUS"
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TITLE="SDL_JoystickClose"
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HREF="sdljoystickclose.html"><LINK
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REL="NEXT"
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TITLE="SDL_AudioSpec"
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HREF="sdlaudiospec.html"><META
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NAME="KEYWORD"
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CONTENT="audio"><META
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NAME="KEYWORD"
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CONTENT="function"></HEAD
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><BODY
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CLASS="CHAPTER"
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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="sdljoystickclose.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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></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="sdlaudiospec.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="CHAPTER"
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><H1
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><A
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NAME="AUDIO"
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></A
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>Chapter 10. Audio</H1
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><DIV
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CLASS="TOC"
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><DL
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><DT
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><B
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>Table of Contents</B
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></DT
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><DT
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><A
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HREF="sdlaudiospec.html"
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>SDL_AudioSpec</A
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>&nbsp;--&nbsp;Audio Specification Structure</DT
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><DT
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><A
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HREF="sdlopenaudio.html"
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>SDL_OpenAudio</A
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>&nbsp;--&nbsp;Opens the audio device with the desired parameters.</DT
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><DT
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><A
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HREF="sdlpauseaudio.html"
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>SDL_PauseAudio</A
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>&nbsp;--&nbsp;Pauses and unpauses the audio callback processing</DT
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><DT
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><A
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HREF="sdlgetaudiostatus.html"
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>SDL_GetAudioStatus</A
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>&nbsp;--&nbsp;Get the current audio state</DT
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><DT
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><A
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HREF="sdlloadwav.html"
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>SDL_LoadWAV</A
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>&nbsp;--&nbsp;Load a WAVE file</DT
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><DT
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><A
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HREF="sdlfreewav.html"
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>SDL_FreeWAV</A
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>&nbsp;--&nbsp;Frees previously opened WAV data</DT
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><DT
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><A
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HREF="sdlaudiocvt.html"
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>SDL_AudioCVT</A
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>&nbsp;--&nbsp;Audio Conversion Structure</DT
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><DT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   125
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   126
HREF="sdlbuildaudiocvt.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   127
>SDL_BuildAudioCVT</A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   128
>&nbsp;--&nbsp;Initializes a SDL_AudioCVT structure for conversion</DT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   129
><DT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   130
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   131
HREF="sdlconvertaudio.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   132
>SDL_ConvertAudio</A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   133
>&nbsp;--&nbsp;Convert audio data to a desired audio format.</DT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   134
><DT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   135
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   136
HREF="sdlmixaudio.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   137
>SDL_MixAudio</A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   138
>&nbsp;--&nbsp;Mix audio data</DT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   139
><DT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   140
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   141
HREF="sdllockaudio.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   142
>SDL_LockAudio</A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   143
>&nbsp;--&nbsp;Lock out the callback function</DT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   144
><DT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   145
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   146
HREF="sdlunlockaudio.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   147
>SDL_UnlockAudio</A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   148
>&nbsp;--&nbsp;Unlock the callback function</DT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   149
><DT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   150
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   151
HREF="sdlcloseaudio.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   152
>SDL_CloseAudio</A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   153
>&nbsp;--&nbsp;Shuts down audio processing and closes the audio device.</DT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   154
></DL
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   155
></DIV
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   156
><P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   157
>Sound on the computer is translated from waves that you hear into a series of 
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   158
values, or samples, each representing the amplitude of the wave.  When these
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   159
samples are sent in a stream to a sound card, an approximation of the original
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   160
wave can be recreated.  The more bits used to represent the amplitude, and the
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   161
greater frequency these samples are gathered, the closer the approximated
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   162
sound is to the original, and the better the quality of sound.</P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   163
><P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   164
>This library supports both 8 and 16 bit signed and unsigned sound samples,
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   165
at frequencies ranging from 11025 Hz to 44100 Hz, depending on the 
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   166
underlying hardware.  If the hardware doesn't support the desired audio
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   167
format or frequency, it can be emulated if desired (See 
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   168
<A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   169
HREF="sdlopenaudio.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   170
><TT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   171
CLASS="FUNCTION"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   172
>SDL_OpenAudio()</TT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   173
></A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   174
>)</P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   175
><P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   176
>A commonly supported audio format is 16 bits per sample at 22050 Hz.</P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   177
></DIV
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   178
><DIV
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   179
CLASS="NAVFOOTER"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   180
><HR
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   181
ALIGN="LEFT"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   182
WIDTH="100%"><TABLE
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   183
SUMMARY="Footer navigation table"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   184
WIDTH="100%"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   185
BORDER="0"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   186
CELLPADDING="0"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   187
CELLSPACING="0"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   188
><TR
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   189
><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   190
WIDTH="33%"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   191
ALIGN="left"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   192
VALIGN="top"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   193
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   194
HREF="sdljoystickclose.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   195
ACCESSKEY="P"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   196
>Prev</A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   197
></TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   198
><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   199
WIDTH="34%"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   200
ALIGN="center"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   201
VALIGN="top"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   202
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   203
HREF="index.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   204
ACCESSKEY="H"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   205
>Home</A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   206
></TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   207
><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   208
WIDTH="33%"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   209
ALIGN="right"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   210
VALIGN="top"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   211
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   212
HREF="sdlaudiospec.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   213
ACCESSKEY="N"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   214
>Next</A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   215
></TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   216
></TR
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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><TR
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   219
WIDTH="33%"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   220
ALIGN="left"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   221
VALIGN="top"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   222
>SDL_JoystickClose</TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   223
><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   224
WIDTH="34%"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   225
ALIGN="center"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   226
VALIGN="top"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   227
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   228
HREF="reference.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   229
ACCESSKEY="U"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   230
>Up</A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   231
></TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   232
><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   233
WIDTH="33%"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   234
ALIGN="right"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   235
VALIGN="top"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   236
>SDL_AudioSpec</TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   237
></TR
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   238
></TABLE
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   239
></DIV
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   240
></BODY
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   241
></HTML
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   242
>