Mercurial > sdl-ios-xcode
view src/video/Xext/extensions/xf86vmode.h @ 942:41a59de7f2ed
Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
surround sound on Linux using the Alsa driver. To use them, naturally
you need a sound card that will do 4 or 6 channels and probably also a
recent version of the Alsa drivers and library. Since the only SDL
output driver that knows about surround sound is the Alsa driver,
you���ll want to choose it, using:
export SDL_AUDIODRIVER=alsa
There are no syntactic changes to the programming API. No new
library calls, no differences in arguments.
There are two semantic changes:
(1) For library calls with number of channels as an argument, formerly
you could use only 1 or 2 for the number of channels. Now you
can also use 4 or 6.
(2) The two "left" and "right" arguments to Mix_SetPanning, for the
case of 4 or 6 channels, no longer simply control the volumes of
the left and right channels. Now the "left" argument is converted
to an angle and Mix_SetPosition is called, and the "right" argu-
ment is ignored.
With two exceptions, so far as I know, the modified SDL12 and
SDL_mixer work the same way as the original versions, when opened for
1 or 2 channel output. The two exceptions are bugs which I fixed.
Well, the first, anyway, is a bug for sure. When rate conversions up
or down by a factor of two are applied (in src/audio/SDL_audiocvt.c),
streams with different numbers of channels (that is, mono and stereo)
are treated the same way: either each sample is copied or every other
sample is omitted. This is ok for mono, but for stereo, it is frames
that should be copied or omitted, where by "frame" I mean a portion of
the stream containing one sample for each channel. (In the SDL source,
confusingly, sometimes frames are called "samples".) So for these
rate conversions, stereo streams have to be treated differently, and
they are, in my modified version.
The other problem that might be characterized as a bug arises
when SDL_mixer is passed a multichannel chunk which does not have an
integral number of frames. Due to the way the effect_position code
loops over frames, when the chunk ends with a partial frame, memory
outside the chunk buffer will be accessed. In the case of stereo,
it���s possible that because malloc may give more memory than requested,
this potential problem never actually causes a segment fault. I don���t
know. For 6 channel chunks, I do know, and it does cause segment
faults.
If SDL_mixer is passed defective chunks and this causes a segment
fault, arguably, that���s not a bug in SDL_mixer. Still, whether or not
it counts as a bug, it���s easy to protect against, so why not? I added
code in mixer.c to discard any partial frame at the end of a chunk.
Then what about when SDL or SDL_mixer is opened for 4 or 6 chan-
nel output? What happens with the parts of the current library
designed for stereo? I don���t know whether I���ve covered all the bases,
but I���ve tried:
(1) For playing 2 channel waves, or other cases where SDL knows it has
to match up a 2 channel source with a 4 or 6 channel output, I���ve
added code in SDL_audiocvt.c to make the necessary conversions.
(2) For playing midis using timidity, I���ve converted timidity to do 4
or 6 channel output, upon request.
(3) For playing mods using mikmod, I put ad hoc code in music.c to
convert the stereo output that mikmod produces to 4 or 6 chan-
nels. Obviously it would be better to change the mikmod code to
mix down into 4 or 6 channels, but I have a hard time following
the code in mikmod, so I didn���t do that.
(4) For playing mp3s, I put ad hoc code in smpeg to copy channels in
the case when 4 or 6 channel output is needed.
(5) There seems to be no problem with .ogg files - stereo .oggs can be
up converted as .wavs are.
(6) The effect_position code in SDL_mixer is now generalized to in-
clude the cases of 4 and 6 channel streams.
I���ve done a very limited amount of compatibility testing for some
of the games using SDL I happen to have. For details, see the file
TESTS.
I���ve put into a separate archive, Surround-SDL-testfiles.tgz, a
couple of 6 channel wave files for testing and a 6 channel ogg file.
If you have the right hardware and version of Alsa, you should be able
to play the wave files with the Alsa utility aplay (and hear all
channels, except maybe lfe, for chan-id.wav, since it���s rather faint).
Don���t expect aplay to give good sound, though. There���s something
wrong with the current version of aplay.
The canyon.ogg file is to test loading of 6 channel oggs. After
patching and compiling, you can play it with playmus. (My version of
ogg123 will not play it, and I had to patch mplayer to get it to play
6 channel oggs.)
Greg Lee <greg@ling.lll.hawaii.edu>
Thus, July 1, 2004
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Sat, 21 Aug 2004 12:27:02 +0000 |
parents | 585a7e1285ae |
children | 782fd950bd46 c121d94672cb |
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/* $XFree86: xc/include/extensions/xf86vmode.h,v 3.30 2001/05/07 20:09:50 mvojkovi Exp $ */ /* Copyright 1995 Kaleb S. KEITHLEY Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL Kaleb S. KEITHLEY BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Except as contained in this notice, the name of Kaleb S. KEITHLEY shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from Kaleb S. KEITHLEY */ /* $Xorg: xf86vmode.h,v 1.3 2000/08/18 04:05:46 coskrey Exp $ */ /* THIS IS NOT AN X CONSORTIUM STANDARD OR AN X PROJECT TEAM SPECIFICATION */ #ifndef _XF86VIDMODE_H_ #define _XF86VIDMODE_H_ #include <X11/Xfuncproto.h> #include <X11/Xmd.h> #include "SDL_name.h" #define X_XF86VidModeQueryVersion 0 #define X_XF86VidModeGetModeLine 1 #define X_XF86VidModeModModeLine 2 #define X_XF86VidModeSwitchMode 3 #define X_XF86VidModeGetMonitor 4 #define X_XF86VidModeLockModeSwitch 5 #define X_XF86VidModeGetAllModeLines 6 #define X_XF86VidModeAddModeLine 7 #define X_XF86VidModeDeleteModeLine 8 #define X_XF86VidModeValidateModeLine 9 #define X_XF86VidModeSwitchToMode 10 #define X_XF86VidModeGetViewPort 11 #define X_XF86VidModeSetViewPort 12 /* new for version 2.x of this extension */ #define X_XF86VidModeGetDotClocks 13 #define X_XF86VidModeSetClientVersion 14 #define X_XF86VidModeSetGamma 15 #define X_XF86VidModeGetGamma 16 #define X_XF86VidModeGetGammaRamp 17 #define X_XF86VidModeSetGammaRamp 18 #define X_XF86VidModeGetGammaRampSize 19 #define CLKFLAG_PROGRAMABLE 1 #ifdef XF86VIDMODE_EVENTS #define XF86VidModeNotify 0 #define XF86VidModeNumberEvents (XF86VidModeNotify + 1) #define XF86VidModeNotifyMask 0x00000001 #define XF86VidModeNonEvent 0 #define XF86VidModeModeChange 1 #else #define XF86VidModeNumberEvents 0 #endif #define XF86VidModeBadClock 0 #define XF86VidModeBadHTimings 1 #define XF86VidModeBadVTimings 2 #define XF86VidModeModeUnsuitable 3 #define XF86VidModeExtensionDisabled 4 #define XF86VidModeClientNotLocal 5 #define XF86VidModeZoomLocked 6 #define XF86VidModeNumberErrors (XF86VidModeZoomLocked + 1) #ifndef _XF86VIDMODE_SERVER_ typedef struct { unsigned short hdisplay; unsigned short hsyncstart; unsigned short hsyncend; unsigned short htotal; unsigned short hskew; unsigned short vdisplay; unsigned short vsyncstart; unsigned short vsyncend; unsigned short vtotal; unsigned int flags; int privsize; #if defined(__cplusplus) || defined(c_plusplus) /* private is a C++ reserved word */ INT32 *c_private; #else INT32 *private; #endif } SDL_NAME(XF86VidModeModeLine); typedef struct { unsigned int dotclock; unsigned short hdisplay; unsigned short hsyncstart; unsigned short hsyncend; unsigned short htotal; unsigned short hskew; unsigned short vdisplay; unsigned short vsyncstart; unsigned short vsyncend; unsigned short vtotal; unsigned int flags; int privsize; #if defined(__cplusplus) || defined(c_plusplus) /* private is a C++ reserved word */ INT32 *c_private; #else INT32 *private; #endif } SDL_NAME(XF86VidModeModeInfo); typedef struct { float hi; float lo; } SDL_NAME(XF86VidModeSyncRange); typedef struct { char* vendor; char* model; float EMPTY; unsigned char nhsync; SDL_NAME(XF86VidModeSyncRange)* hsync; unsigned char nvsync; SDL_NAME(XF86VidModeSyncRange)* vsync; } SDL_NAME(XF86VidModeMonitor); typedef struct { int type; /* of event */ unsigned long serial; /* # of last request processed by server */ Bool send_event; /* true if this came from a SendEvent req */ Display *display; /* Display the event was read from */ Window root; /* root window of event screen */ int state; /* What happened */ int kind; /* What happened */ Bool forced; /* extents of new region */ Time time; /* event timestamp */ } SDL_NAME(XF86VidModeNotifyEvent); typedef struct { float red; /* Red Gamma value */ float green; /* Green Gamma value */ float blue; /* Blue Gamma value */ } SDL_NAME(XF86VidModeGamma); #define SDL_XF86VidModeSelectNextMode(disp, scr) \ SDL_NAME(XF86VidModeSwitchMode)(disp, scr, 1) #define SDL_XF86VidModeSelectPrevMode(disp, scr) \ SDL_NAME(XF86VidModeSwitchMode)(disp, scr, -1) _XFUNCPROTOBEGIN Bool SDL_NAME(XF86VidModeQueryVersion)( Display* /* dpy */, int* /* majorVersion */, int* /* minorVersion */ ); Bool SDL_NAME(XF86VidModeQueryExtension)( Display* /* dpy */, int* /* event_base */, int* /* error_base */ ); Bool SDL_NAME(XF86VidModeSetClientVersion)( Display* /* dpy */ ); Bool SDL_NAME(XF86VidModeGetModeLine)( Display* /* dpy */, int /* screen */, int* /* dotclock */, SDL_NAME(XF86VidModeModeLine)* /* modeline */ ); Bool SDL_NAME(XF86VidModeGetAllModeLines)( Display* /* dpy */, int /* screen */, int* /* modecount */, SDL_NAME(XF86VidModeModeInfo)*** /* modelinesPtr */ ); Bool SDL_NAME(XF86VidModeAddModeLine)( Display* /* dpy */, int /* screen */, SDL_NAME(XF86VidModeModeInfo)* /* new modeline */, SDL_NAME(XF86VidModeModeInfo)* /* after modeline */ ); Bool SDL_NAME(XF86VidModeDeleteModeLine)( Display* /* dpy */, int /* screen */, SDL_NAME(XF86VidModeModeInfo)* /* modeline */ ); Bool SDL_NAME(XF86VidModeModModeLine)( Display* /* dpy */, int /* screen */, SDL_NAME(XF86VidModeModeLine)* /* modeline */ ); Status SDL_NAME(XF86VidModeValidateModeLine)( Display* /* dpy */, int /* screen */, SDL_NAME(XF86VidModeModeInfo)* /* modeline */ ); Bool SDL_NAME(XF86VidModeSwitchMode)( Display* /* dpy */, int /* screen */, int /* zoom */ ); Bool SDL_NAME(XF86VidModeSwitchToMode)( Display* /* dpy */, int /* screen */, SDL_NAME(XF86VidModeModeInfo)* /* modeline */ ); Bool SDL_NAME(XF86VidModeLockModeSwitch)( Display* /* dpy */, int /* screen */, int /* lock */ ); Bool SDL_NAME(XF86VidModeGetMonitor)( Display* /* dpy */, int /* screen */, SDL_NAME(XF86VidModeMonitor)* /* monitor */ ); Bool SDL_NAME(XF86VidModeGetViewPort)( Display* /* dpy */, int /* screen */, int* /* x return */, int* /* y return */ ); Bool SDL_NAME(XF86VidModeSetViewPort)( Display* /* dpy */, int /* screen */, int /* x */, int /* y */ ); Bool SDL_NAME(XF86VidModeGetDotClocks)( Display* /* dpy */, int /* screen */, int* /* flags return */, int* /* number of clocks return */, int* /* max dot clock return */, int** /* clocks return */ ); Bool SDL_NAME(XF86VidModeGetGamma)( Display* /* dpy */, int /* screen */, SDL_NAME(XF86VidModeGamma)* /* Gamma */ ); Bool SDL_NAME(XF86VidModeSetGamma)( Display* /* dpy */, int /* screen */, SDL_NAME(XF86VidModeGamma)* /* Gamma */ ); Bool SDL_NAME(XF86VidModeSetGammaRamp)( Display* /* dpy */, int /* screen */, int /* size */, unsigned short* /* red array */, unsigned short* /* green array */, unsigned short* /* blue array */ ); Bool SDL_NAME(XF86VidModeGetGammaRamp)( Display* /* dpy */, int /* screen */, int /* size */, unsigned short* /* red array */, unsigned short* /* green array */, unsigned short* /* blue array */ ); Bool SDL_NAME(XF86VidModeGetGammaRampSize)( Display* /* dpy */, int /* screen */, int* /* size */ ); _XFUNCPROTOEND #endif #endif