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<A HREF="FSOUND.html#Functions"><H5>[API function]</A></H5>
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<H2><A NAME="FSOUND_DSP_Create">FSOUND_DSP_Create</A></H2>
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Creates a DSP unit, and places it in the DSP chain position specified by the priority<BR>
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parameter. Read the remarks section carefully for issues regarding DSP units.<BR>
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DSP units are freed with FSOUND_DSP_Free.<BR>
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<P>
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<B>FSOUND_DSPUNIT *F_API </B><B> </B><B>FSOUND_DSP_Create</B><B>(</B><BR>
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<B>FSOUND_DSPCALLBACK </B><B> </B><I>callback</I><B>,</B><BR>
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<B>int </B><B> </B><I>priority</I><B>,</B><BR>
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<B>void *</B><I>userdata</I><BR>
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<B>);</B><BR>
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<H3>Parameters</H3>
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<TABLE>
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<TR VALIGN=top><TD><I>callback</I></TD>
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<TD>This is a pointer to your DSP Unit callback, of type FSOUND_DSPCALLBACK.<BR>
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The prototype for a callback is declared in the following fashion.<BR>
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Callbacks must return a pointer to the buffer you work on, so that<BR>
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the next dsp unit can work on it. <BR>
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Here is the simplest case:<BR>
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void *callback(void *originalbuffer, void *newbuffer, int length, void *userdata)<BR>
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{<BR>
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// originalbuffer = fsounds original mixbuffer.<BR>
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// newbuffer = the buffer passed from the previous DSP unit.<BR>
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// length = length in samples at this mix time.<BR>
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// param = user parameter passed through in FSOUND_DSP_Create.<BR>
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//<BR>
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// modify the buffer in some fashion<BR>
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return newbuffer;<BR>
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}<BR>
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See the definition of FSOUND_DSPCALLBACK for more.<BR>
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</TD><TR VALIGN=top><TD><I>priority</I></TD>
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<TD>Order in the priority chain. Valid numbers are 0 to 1000, 0 being<BR>
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highest priority (first), with 1000 being lowest priority (last).<BR>
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Note that FSOUNDs soundeffects mixers and copy routines are considered<BR>
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part of this DSP unit chain which you can play with.<BR>
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</TD><TR VALIGN=top><TD><I>param</I></TD>
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<TD>User defined parameter, this gets passed into the callback when it is<BR>
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called. It is safe to leave this value 0.<BR>
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</TD></TABLE>
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<H3>Return Value</H3>
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On success, a pointer to a new valid DSP unit is returned.<BR>
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On failure, NULL is returned.<BR>
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<H3>Remarks</H3>
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A dsp unit is NOT ACTIVE by default. You have to activate it with FSOUND_DSP_SetActive<BR>
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---------------------------------------------------------------------------------------<BR>
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Priorities and default system units.<BR>
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---------------------------------------------------------------------------------------<BR>
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A note on priorities. FSOUND processes DSP units in order of priority. A 0 priority<BR>
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unit gets processed first, a 1 priority unit gets processed next, and so on. <BR>
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FSOUND actually uses these DSP units to mix its sound effects and music! Yes, you have<BR>
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access to them (be careful!). It is possible to totally remove, replace or deactivate <BR>
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all of FSOUND's system units so that it does nothing at all!<BR>
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FSOUND has preinstalled default system units at the following priority locations:<BR>
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FSOUND_DSP_DEFAULTPRIORITY_CLEARUNIT (priority 0) - Clear Unit. This unit clears out <BR>
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the mixbuffer for the next units to mix into. You can disable this unit and replace<BR>
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it with something other than a clearer, such as a scaler, which fades down the mix<BR>
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buffer instead of clearing it, to produce a very rough echo effect.<BR>
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FSOUND_DSP_DEFAULTPRIORITY_SFXUNIT (priority 100) - SFX Unit. This unit mixes sound <BR>
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effect channels into the mix buffer, which was previously cleared with the Clear <BR>
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Unit. <BR>
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FSOUND_DSP_DEFAULTPRIORITY_MUSICUNIT (priority 200) - Music Unit. This unit mixes all <BR>
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music channels into the mix buffer, which was previously mixed into with the SFX <BR>
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Unit. <BR>
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FSOUND_DSP_DEFAULTPRIORITY_CLIPANDCOPYUNIT (priority 1000) - Clip and Copy Unit. This <BR>
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unit takes the finally mixed buffer, and clips it to the output stream size (if it<BR>
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needs to), and then sends it off to the sound device. It is done last. If this is<BR>
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disabled you will hear no sound.<BR>
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---------------------------------------------------------------------------------------<BR>
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Buffer Lengths.<BR>
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---------------------------------------------------------------------------------------<BR>
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The 'length' value of the DSP callback is roughly 20ms worth of data.<BR>
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Use FSOUND_DSP_GetBufferLength to get the exact callback length.<BR>
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---------------------------------------------------------------------------------------<BR>
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Buffer Widths<BR>
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---------------------------------------------------------------------------------------<BR>
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Remember that FSOUND uses different buffer types depending on what type of mixer it is.<BR>
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You will have to compensate for this by writing different routines depending on the <BR>
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mixer type (ie mmx or non mmx), just like FSOUND does. <BR>
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Currently there are the 3 types of mixers and their buffer sizes.<BR>
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You can get the type of mixer being used by calling the FSOUND_GetMixer function.<BR>
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You may want to check on this inside your callback, or set up a function pointer system,<BR>
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whatever you think is suitable (it costs nothing to do a FSOUND_GetMixer every time).<BR>
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- FSOUND_MIXER_BLENDMODE : This buffer is a stereo, signed 32bit buffer (8 bytes per <BR>
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sample). The data is in integer format.<BR>
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Data written to this buffer is not clipped and passed to the output stream until the <BR>
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very end of the chain (the clip and copy unit). For this type of mixer, you dont <BR>
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have to worry about clipping becuase FSOUND does this for you.<BR>
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- FSOUND_MIXER_QUALITY_FPU / FSOUND_MIXER_QUALITY_FPU_VOLUMERAMP: This buffer is also a <BR>
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stereo, signed 32bit buffer (8 bytes per sample). This data is in floating point <BR>
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format.<BR>
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The same clip and copy rules apply here as for the above mixer.<BR>
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- Any MMX based mixer : This buffer is a stereo, signed 16bit buffer (4 bytes per sample).<BR>
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When writing to this buffer, you must make sure the result does not overflow this <BR>
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signed 16bit range.<BR>
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If you add data into to this buffer, make sure it is clipped to a signed 16bit range<BR>
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before writing it back. FSOUND only copies this data to the output stream, it does<BR>
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not clip it.<BR>
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---------------------------------------------------------------------------------------<BR>
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Speed<BR>
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---------------------------------------------------------------------------------------<BR>
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DSP Units are processed then and there, inside the mixing routine. Remember to make<BR>
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your process as FAST as possible, or the output device's play cursor will catch up to<BR>
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FSOUND's write cursor while your routine takes its time to complete, and make it start <BR>
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to break up. <BR>
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So basically, if it isnt fast, then FSOUND will not be able to send the data to the<BR>
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output device in time for the next mixer update, and the result will be corrupted sound.<BR>
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FSOUND_DSP_MixBuffers is available now, so if you need to mix some raw data into the output <BR>
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buffer quickly, you can use FSOUND's own optimized mixer directly to do it!<BR>
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Finally, you can see how your routine affects cpu usage, by using FSOUND_GetCPUUsage.<BR>
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The cpu usage returned by this function includes any time spent in DSP units as well.<BR>
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(this function times everything). If you are really bored, you can see how much FSOUND's<BR>
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system units take cpu-wise, by turning them on and off and seeing how they affect <BR>
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performance.<BR>
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___________________<BR>
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Supported on the following platforms : Win32, WinCE, Linux, Macintosh, XBox, GameCube<BR>
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<H3>See Also</H3>
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<A HREF="FSOUND_DSP_Create.html">FSOUND_DSP_Create</A>
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,
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<A HREF="FSOUND_DSP_Free.html">FSOUND_DSP_Free</A>
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,
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<A HREF="FSOUND_DSP_GetBufferLength.html">FSOUND_DSP_GetBufferLength</A>
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,
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<A HREF="FSOUND_DSP_GetBufferLengthTotal.html">FSOUND_DSP_GetBufferLengthTotal</A>
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,
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<A HREF="FSOUND_DSP_MixBuffers.html">FSOUND_DSP_MixBuffers</A>
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,
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<A HREF="FSOUND_DSP_PRIORITIES.html">FSOUND_DSP_PRIORITIES</A>
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,
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<A HREF="FSOUND_DSP_SetActive.html">FSOUND_DSP_SetActive</A>
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,
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<A HREF="FSOUND_DSP_SetPriority.html">FSOUND_DSP_SetPriority</A>
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,
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<A HREF="FSOUND_DSPCALLBACK.html">FSOUND_DSPCALLBACK</A>
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,
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<A HREF="FSOUND_GetCPUUsage.html">FSOUND_GetCPUUsage</A>
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,
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<A HREF="FSOUND_GetMixer.html">FSOUND_GetMixer</A>
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,
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<A HREF="FSOUND_MIXERTYPES.html">FSOUND_MIXERTYPES</A>
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,
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<A HREF="FSOUND_PlaySoundEx.html">FSOUND_PlaySoundEx</A>
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,
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<A HREF="FSOUND_Stream_CreateDSP.html">FSOUND_Stream_CreateDSP</A>
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<HR><BR><FONT SIZE="-2">This document copyright ©Firelight Technologies, Pty, Ltd, 1999-2002. All rights reserved.</FONT><BR>
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<FONT SIZE="-2">Generated Thu Dec 15 17:31:28 2005
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