Mercurial > sdl-ios-xcode
view README.Epoc @ 2042:3908e1f808e1
Fixed bug #292
I might be on crack here.
It looks like SDL_ConvertMono() in src/audio/SDL_audiocvt.c adds the left and
right channels of a stereo stream together, and clamps the new mono channel if
it would overflow.
Shouldn't it be dividing by 2 to average the two sample points instead of
clamping? Otherwise the mono sample point's volume doubles in the conversion.
This would also make the conversion faster, as it replaces two branches per
sample frame with a bitwise shift.
--ryan.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 24 Sep 2006 15:56:36 +0000 |
| parents | 74a8f672f2f8 |
| children |
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============================================================================== Using the Simple DirectMedia Layer with EPOC/SymbianOS 6.0 ============================================================================== ============================================================================== I. Building the Simple DirectMedia Layer libraries: You can get Symbian SDK from: http://www.symbian.com. First create "Epoc" directory under SDL main directory and unpack EpocBuildFiles.zip in it. To build the librarys goto "epoc" directory and type: bldmake bldfiles abld makefile vc6 (for creating Microsoft Visual C++ makefiles) abld build wins udeb (building for wins emulator) abld build armi urel (building for real device) ============================================================================== II. Building the Simple DirectMedia Layer programs: Building SDL test programs is easy once you have built the libraries: abld test build wins udeb abld test build armi urel Supported real screen resolutions 320 x 200 x 8 bit 320 x 200 x 12 bit 640 x 200 x 8 bit 640 x 200 x 12 bit Supported "emulated" screen resolutions 640 x 400 x 8 bit 640 x 400 x 12 bit 640 x 480 x 8 bit 640 x 480 x 12 bit "Emulated" resolutions are implemented by by shrinking the screen vertically i.e. only every second scanline is drawn. This is mainly ment to be used for testing quick ports of programs. Using faked resolutions is a waste of memory and cpu power! ============================================================================== III. Running test programs Copy executable to the device and run it from the File manager. The Esc key quits demo programs. In Crystal, Exe programs do not appear in task list nor in Extras :-(. Test programs are tested in Nokia 9210 Communicator. Special keys used in SDL: The Caps lock key enables or disables the virtual cursor. Function keys are mapped as follows: F1=chr+q, F2=chr+w,..., F8=chr+i, F9=chr+a,..., F12=chr+d. ============================================================================== IV. Enjoy! :) If you have a project you'd like me to know about, or want to ask questions, go ahead and join the SDL developer's mailing list by sending e-mail to: sdl-request@libsdl.org and put "subscribe" into the subject of the message. Or alternatively you can use the web interface: http://www.libsdl.org/mailman/listinfo/sdl You can find more info about Epoc version of SDL from Hannu Viitala's homepage http://www.mbnet.fi/~haviital ==============================================================================