symbian-qemu-0.9.1-12/libsdl-trunk/docs/html/audio.html
author William Roberts <williamr@symbian.org>
Fri, 07 Aug 2009 11:20:16 +0100
changeset 7 b016402e601c
parent 1 2fb8b9db1c86
permissions -rw-r--r--
Fix E32PATH to make bootstrap compile correctly, tidy up other extension option paths
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
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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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   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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><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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   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:
diff changeset
   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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   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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   149
><DT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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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:
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   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
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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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diff changeset
   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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parents:
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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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><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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   178
><DIV
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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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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diff changeset
   186
CELLPADDING="0"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   187
CELLSPACING="0"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   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
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parents:
diff changeset
   191
ALIGN="left"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   192
VALIGN="top"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   193
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   194
HREF="sdljoystickclose.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   195
ACCESSKEY="P"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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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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   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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   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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   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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><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   208
WIDTH="33%"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   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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   215
></TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   216
></TR
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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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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   220
ALIGN="left"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   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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   223
><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   224
WIDTH="34%"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   225
ALIGN="center"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   226
VALIGN="top"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   227
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   228
HREF="reference.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   229
ACCESSKEY="U"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   230
>Up</A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   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:
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   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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   237
></TR
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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></TABLE
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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></DIV
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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></BODY
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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></HTML
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>