Mercurial > sdl-ios-xcode
view src/video/Xext/Xv/Xvlibint.h @ 1982:3b4ce57c6215
First shot at new audio data types (int32 and float32).
Notable changes:
- Converters between types are autogenerated. Instead of making multiple
passes over the data with seperate filters for endianess, size, signedness,
etc, converting between data types is always one specialized filter. This
simplifies SDL_BuildAudioCVT(), which otherwise had a million edge cases
with the new types, and makes the actually conversions more CPU cache
friendly. Left a stub for adding specific optimized versions of these
routines (SSE/MMX/Altivec, assembler, etc)
- Autogenerated converters are built by SDL/src/audio/sdlgenaudiocvt.pl. This
does not need to be run unless tweaking the code, and thus doesn't need
integration into the build system.
- Went through all the drivers and tried to weed out all the "Uint16"
references that are better specified with the new SDL_AudioFormat typedef.
- Cleaned out a bunch of hardcoded bitwise magic numbers and replaced them
with new SDL_AUDIO_* macros.
- Added initial float32 and int32 support code. Theoretically, existing
drivers will push these through converters to get the data they want to
feed to the hardware.
Still TODO:
- Optimize and debug new converters.
- Update the CoreAudio backend to accept float32 data directly.
- Other backends, too?
- SDL_LoadWAV() needs to be updated to support int32 and float32 .wav files
(both of which exist and can be generated by 'sox' for testing purposes).
- Update the mixer to handle new datatypes.
- Optionally update SDL_sound and SDL_mixer, etc.
author | Ryan C. Gordon <icculus@icculus.org> |
---|---|
date | Thu, 24 Aug 2006 12:10:46 +0000 |
parents | c121d94672cb |
children | 81dde1b00bf1 |
line wrap: on
line source
/*********************************************************** Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts, and the Massachusetts Institute of Technology, Cambridge, Massachusetts. All Rights Reserved Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the names of Digital or MIT not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. ******************************************************************/ /* $XFree86: xc/lib/Xv/Xvlibint.h,v 1.5 2001/07/25 15:04:53 dawes Exp $ */ #ifndef XVLIBINT_H #define XVLIBINT_H /* ** File: ** ** Xvlibint.h --- Xv library internal header file ** ** Author: ** ** David Carver (Digital Workstation Engineering/Project Athena) ** ** Revisions: ** ** 01.24.91 Carver ** - version 1.4 upgrade ** */ #define NEED_REPLIES #include <X11/Xlibint.h> #include "../extensions/Xvproto.h" #include "../extensions/Xvlib.h" #if !defined(UNIXCPP) #define XvGetReq(name, req) \ WORD64ALIGN\ if ((dpy->bufptr + SIZEOF(xv##name##Req)) > dpy->bufmax)\ _XFlush(dpy);\ req = (xv##name##Req *)(dpy->last_req = dpy->bufptr);\ req->reqType = info->codes->major_opcode;\ req->xvReqType = xv_##name; \ req->length = (SIZEOF(xv##name##Req))>>2;\ dpy->bufptr += SIZEOF(xv##name##Req);\ dpy->request++ #else /* non-ANSI C uses empty comment instead of "##" for token concatenation */ #define XvGetReq(name, req) \ WORD64ALIGN\ if ((dpy->bufptr + SIZEOF(xv/**/name/**/Req)) > dpy->bufmax)\ _XFlush(dpy);\ req = (xv/**/name/**/Req *)(dpy->last_req = dpy->bufptr);\ req->reqType = info->codes->major_opcode;\ req->xvReqType = xv_/**/name;\ req->length = (SIZEOF(xv/**/name/**/Req))>>2;\ dpy->bufptr += SIZEOF(xv/**/name/**/Req);\ dpy->request++ #endif #endif /* XVLIBINT_H */ /* vi: set ts=4 sw=4 expandtab: */