Mercurial > sdl-ios-xcode
view src/audio/SDL_audiocvt.c @ 1133:609c060fd2a2
The MacOSX Carbon/Cocoa/X11 all in one library patch. Relevant emails:
To: SDL Developers <sdl@libsdl.org>
From: =?ISO-8859-1?Q?Anders_F_Bj=F6rklund?= <afb@algonet.se>
Date: Mon, 30 May 2005 23:29:04 +0200
Subject: [SDL] Mac OS X Video Drivers [patch]
I've updated/added the Carbon and X11 video drivers
to the Mac OS X port of SDL 1.2 (the CVS version),
and made the Cocoa driver and runtime *optional*.
The default is still Cocoa, and the "Quartz" driver.
But you can now also use "toolbox" for Carbon, and
"x11" for running with Apple's (or other) X11 server:
export SDL_VIDEODRIVER=x11
export SDL_VIDEO_GL_DRIVER=/usr/X11R6/lib/libGL.dylib
It also checks if the frameworks are available, by a:
#include <Carbon/Carbon.h> or #import <Cocoa/Cocoa.h>
(this should make it configure on plain Darwin as well?)
Here are the new configure targets:
--enable-video-cocoa use Cocoa/Quartz video driver default=yes
--enable-video-carbon use Carbon/QuickDraw video driver default=yes
--enable-video-x11 use X11 video driver default=no
./configure --enable-video-cocoa --enable-video-carbon
--enable-video-x11 \
--x-includes=/usr/X11R6/include --x-libraries=/usr/X11R6/lib
The Carbon version is just an updated version of the old
SDL driver for Mac OS 9, and could probably be improved...
(but it does work, including the Carbon version of SDLmain)
If you disable cocoa, you can run with -framework Carbon only,
and the C version of SDL_main.c. And if you disable carbon too,
you can still use the X11 version which doesn't require SDLmain.
I updated the DrawSprocket version, but did not include it.
(no blitters or VRAM GWorlds etc. available on OS X anyway)
Besides for Mac OS 9, I don't think there's any use for it ?
And note that any performance on Mac OS X equals OpenGL anyway...
You can get "fair" software SDL results on captured CG displays,
but for decent frame rates you need to be using GL for rendering.
Finally, here is the patch itself:
http://www.algonet.se/~afb/SDL-12CVS-macvideo.patch
--anders
PS. It says "video", but as usual it applies to mouse/keyboard too.
------
To: A list for developers using the SDL library <sdl@libsdl.org>
From: =?ISO-8859-1?Q?Anders_F_Bj=F6rklund?= <afb@algonet.se>
Date: Sun, 4 Sep 2005 10:02:15 +0200
Subject: [SDL] Updated Mac patch
Updated the previous Mac patch to disable Carbon by default.
Also "fixed" the SDL.spec again, so that it builds on Darwin.
http://www.algonet.se/~afb/SDL-1.2.9-mac.patch
Also applied fine to SDL12 CVS, when I tried it.
author | Ryan C. Gordon <icculus@icculus.org> |
---|---|
date | Thu, 08 Sep 2005 06:16:14 +0000 |
parents | 4095d9ca23f2 |
children | c9b51268668f |
line wrap: on
line source
/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2004 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with this library; if not, write to the Free Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Sam Lantinga slouken@libsdl.org */ #ifdef SAVE_RCSID static char rcsid = "@(#) $Id$"; #endif /* Functions for audio drivers to perform runtime conversion of audio format */ #include <stdio.h> #include "SDL_error.h" #include "SDL_audio.h" /* Effectively mix right and left channels into a single channel */ void SDL_ConvertMono(SDL_AudioCVT *cvt, Uint16 format) { int i; Sint32 sample; #ifdef DEBUG_CONVERT fprintf(stderr, "Converting to mono\n"); #endif switch (format&0x8018) { case AUDIO_U8: { Uint8 *src, *dst; src = cvt->buf; dst = cvt->buf; for ( i=cvt->len_cvt/2; i; --i ) { sample = src[0] + src[1]; if ( sample > 255 ) { *dst = 255; } else { *dst = sample; } src += 2; dst += 1; } } break; case AUDIO_S8: { Sint8 *src, *dst; src = (Sint8 *)cvt->buf; dst = (Sint8 *)cvt->buf; for ( i=cvt->len_cvt/2; i; --i ) { sample = src[0] + src[1]; if ( sample > 127 ) { *dst = 127; } else if ( sample < -128 ) { *dst = -128; } else { *dst = sample; } src += 2; dst += 1; } } break; case AUDIO_U16: { Uint8 *src, *dst; src = cvt->buf; dst = cvt->buf; if ( (format & 0x1000) == 0x1000 ) { for ( i=cvt->len_cvt/4; i; --i ) { sample = (Uint16)((src[0]<<8)|src[1])+ (Uint16)((src[2]<<8)|src[3]); if ( sample > 65535 ) { dst[0] = 0xFF; dst[1] = 0xFF; } else { dst[1] = (sample&0xFF); sample >>= 8; dst[0] = (sample&0xFF); } src += 4; dst += 2; } } else { for ( i=cvt->len_cvt/4; i; --i ) { sample = (Uint16)((src[1]<<8)|src[0])+ (Uint16)((src[3]<<8)|src[2]); if ( sample > 65535 ) { dst[0] = 0xFF; dst[1] = 0xFF; } else { dst[0] = (sample&0xFF); sample >>= 8; dst[1] = (sample&0xFF); } src += 4; dst += 2; } } } break; case AUDIO_S16: { Uint8 *src, *dst; src = cvt->buf; dst = cvt->buf; if ( (format & 0x1000) == 0x1000 ) { for ( i=cvt->len_cvt/4; i; --i ) { sample = (Sint16)((src[0]<<8)|src[1])+ (Sint16)((src[2]<<8)|src[3]); if ( sample > 32767 ) { dst[0] = 0x7F; dst[1] = 0xFF; } else if ( sample < -32768 ) { dst[0] = 0x80; dst[1] = 0x00; } else { dst[1] = (sample&0xFF); sample >>= 8; dst[0] = (sample&0xFF); } src += 4; dst += 2; } } else { for ( i=cvt->len_cvt/4; i; --i ) { sample = (Sint16)((src[1]<<8)|src[0])+ (Sint16)((src[3]<<8)|src[2]); if ( sample > 32767 ) { dst[1] = 0x7F; dst[0] = 0xFF; } else if ( sample < -32768 ) { dst[1] = 0x80; dst[0] = 0x00; } else { dst[0] = (sample&0xFF); sample >>= 8; dst[1] = (sample&0xFF); } src += 4; dst += 2; } } } break; } cvt->len_cvt /= 2; if ( cvt->filters[++cvt->filter_index] ) { cvt->filters[cvt->filter_index](cvt, format); } } /* Discard top 4 channels */ void SDL_ConvertStrip(SDL_AudioCVT *cvt, Uint16 format) { int i; Sint32 lsample, rsample; #ifdef DEBUG_CONVERT fprintf(stderr, "Converting down to stereo\n"); #endif switch (format&0x8018) { case AUDIO_U8: { Uint8 *src, *dst; src = cvt->buf; dst = cvt->buf; for ( i=cvt->len_cvt/6; i; --i ) { lsample = src[0]; rsample = src[1]; dst[0] = lsample; dst[1] = rsample; src += 6; dst += 2; } } break; case AUDIO_S8: { Sint8 *src, *dst; src = (Sint8 *)cvt->buf; dst = (Sint8 *)cvt->buf; for ( i=cvt->len_cvt/6; i; --i ) { lsample = src[0]; rsample = src[1]; dst[0] = lsample; dst[1] = rsample; src += 6; dst += 2; } } break; case AUDIO_U16: { Uint8 *src, *dst; src = cvt->buf; dst = cvt->buf; if ( (format & 0x1000) == 0x1000 ) { for ( i=cvt->len_cvt/12; i; --i ) { lsample = (Uint16)((src[0]<<8)|src[1]); rsample = (Uint16)((src[2]<<8)|src[3]); dst[1] = (lsample&0xFF); lsample >>= 8; dst[0] = (lsample&0xFF); dst[3] = (rsample&0xFF); rsample >>= 8; dst[2] = (rsample&0xFF); src += 12; dst += 4; } } else { for ( i=cvt->len_cvt/12; i; --i ) { lsample = (Uint16)((src[1]<<8)|src[0]); rsample = (Uint16)((src[3]<<8)|src[2]); dst[0] = (lsample&0xFF); lsample >>= 8; dst[1] = (lsample&0xFF); dst[2] = (rsample&0xFF); rsample >>= 8; dst[3] = (rsample&0xFF); src += 12; dst += 4; } } } break; case AUDIO_S16: { Uint8 *src, *dst; src = cvt->buf; dst = cvt->buf; if ( (format & 0x1000) == 0x1000 ) { for ( i=cvt->len_cvt/12; i; --i ) { lsample = (Sint16)((src[0]<<8)|src[1]); rsample = (Sint16)((src[2]<<8)|src[3]); dst[1] = (lsample&0xFF); lsample >>= 8; dst[0] = (lsample&0xFF); dst[3] = (rsample&0xFF); rsample >>= 8; dst[2] = (rsample&0xFF); src += 12; dst += 4; } } else { for ( i=cvt->len_cvt/12; i; --i ) { lsample = (Sint16)((src[1]<<8)|src[0]); rsample = (Sint16)((src[3]<<8)|src[2]); dst[0] = (lsample&0xFF); lsample >>= 8; dst[1] = (lsample&0xFF); dst[2] = (rsample&0xFF); rsample >>= 8; dst[3] = (rsample&0xFF); src += 12; dst += 4; } } } break; } cvt->len_cvt /= 3; if ( cvt->filters[++cvt->filter_index] ) { cvt->filters[cvt->filter_index](cvt, format); } } /* Discard top 2 channels of 6 */ void SDL_ConvertStrip_2(SDL_AudioCVT *cvt, Uint16 format) { int i; Sint32 lsample, rsample; #ifdef DEBUG_CONVERT fprintf(stderr, "Converting 6 down to quad\n"); #endif switch (format&0x8018) { case AUDIO_U8: { Uint8 *src, *dst; src = cvt->buf; dst = cvt->buf; for ( i=cvt->len_cvt/4; i; --i ) { lsample = src[0]; rsample = src[1]; dst[0] = lsample; dst[1] = rsample; src += 4; dst += 2; } } break; case AUDIO_S8: { Sint8 *src, *dst; src = (Sint8 *)cvt->buf; dst = (Sint8 *)cvt->buf; for ( i=cvt->len_cvt/4; i; --i ) { lsample = src[0]; rsample = src[1]; dst[0] = lsample; dst[1] = rsample; src += 4; dst += 2; } } break; case AUDIO_U16: { Uint8 *src, *dst; src = cvt->buf; dst = cvt->buf; if ( (format & 0x1000) == 0x1000 ) { for ( i=cvt->len_cvt/8; i; --i ) { lsample = (Uint16)((src[0]<<8)|src[1]); rsample = (Uint16)((src[2]<<8)|src[3]); dst[1] = (lsample&0xFF); lsample >>= 8; dst[0] = (lsample&0xFF); dst[3] = (rsample&0xFF); rsample >>= 8; dst[2] = (rsample&0xFF); src += 8; dst += 4; } } else { for ( i=cvt->len_cvt/8; i; --i ) { lsample = (Uint16)((src[1]<<8)|src[0]); rsample = (Uint16)((src[3]<<8)|src[2]); dst[0] = (lsample&0xFF); lsample >>= 8; dst[1] = (lsample&0xFF); dst[2] = (rsample&0xFF); rsample >>= 8; dst[3] = (rsample&0xFF); src += 8; dst += 4; } } } break; case AUDIO_S16: { Uint8 *src, *dst; src = cvt->buf; dst = cvt->buf; if ( (format & 0x1000) == 0x1000 ) { for ( i=cvt->len_cvt/8; i; --i ) { lsample = (Sint16)((src[0]<<8)|src[1]); rsample = (Sint16)((src[2]<<8)|src[3]); dst[1] = (lsample&0xFF); lsample >>= 8; dst[0] = (lsample&0xFF); dst[3] = (rsample&0xFF); rsample >>= 8; dst[2] = (rsample&0xFF); src += 8; dst += 4; } } else { for ( i=cvt->len_cvt/8; i; --i ) { lsample = (Sint16)((src[1]<<8)|src[0]); rsample = (Sint16)((src[3]<<8)|src[2]); dst[0] = (lsample&0xFF); lsample >>= 8; dst[1] = (lsample&0xFF); dst[2] = (rsample&0xFF); rsample >>= 8; dst[3] = (rsample&0xFF); src += 8; dst += 4; } } } break; } cvt->len_cvt /= 2; if ( cvt->filters[++cvt->filter_index] ) { cvt->filters[cvt->filter_index](cvt, format); } } /* Duplicate a mono channel to both stereo channels */ void SDL_ConvertStereo(SDL_AudioCVT *cvt, Uint16 format) { int i; #ifdef DEBUG_CONVERT fprintf(stderr, "Converting to stereo\n"); #endif if ( (format & 0xFF) == 16 ) { Uint16 *src, *dst; src = (Uint16 *)(cvt->buf+cvt->len_cvt); dst = (Uint16 *)(cvt->buf+cvt->len_cvt*2); for ( i=cvt->len_cvt/2; i; --i ) { dst -= 2; src -= 1; dst[0] = src[0]; dst[1] = src[0]; } } else { Uint8 *src, *dst; src = cvt->buf+cvt->len_cvt; dst = cvt->buf+cvt->len_cvt*2; for ( i=cvt->len_cvt; i; --i ) { dst -= 2; src -= 1; dst[0] = src[0]; dst[1] = src[0]; } } cvt->len_cvt *= 2; if ( cvt->filters[++cvt->filter_index] ) { cvt->filters[cvt->filter_index](cvt, format); } } /* Duplicate a stereo channel to a pseudo-5.1 stream */ void SDL_ConvertSurround(SDL_AudioCVT *cvt, Uint16 format) { int i; #ifdef DEBUG_CONVERT fprintf(stderr, "Converting stereo to surround\n"); #endif switch (format&0x8018) { case AUDIO_U8: { Uint8 *src, *dst, lf, rf, ce; src = (Uint8 *)(cvt->buf+cvt->len_cvt); dst = (Uint8 *)(cvt->buf+cvt->len_cvt*3); for ( i=cvt->len_cvt; i; --i ) { dst -= 6; src -= 2; lf = src[0]; rf = src[1]; ce = (lf/2) + (rf/2); dst[0] = lf; dst[1] = rf; dst[2] = lf - ce; dst[3] = rf - ce; dst[4] = ce; dst[5] = ce; } } break; case AUDIO_S8: { Sint8 *src, *dst, lf, rf, ce; src = (Sint8 *)cvt->buf+cvt->len_cvt; dst = (Sint8 *)cvt->buf+cvt->len_cvt*3; for ( i=cvt->len_cvt; i; --i ) { dst -= 6; src -= 2; lf = src[0]; rf = src[1]; ce = (lf/2) + (rf/2); dst[0] = lf; dst[1] = rf; dst[2] = lf - ce; dst[3] = rf - ce; dst[4] = ce; dst[5] = ce; } } break; case AUDIO_U16: { Uint8 *src, *dst; Uint16 lf, rf, ce, lr, rr; src = cvt->buf+cvt->len_cvt; dst = cvt->buf+cvt->len_cvt*3; if ( (format & 0x1000) == 0x1000 ) { for ( i=cvt->len_cvt/4; i; --i ) { dst -= 12; src -= 4; lf = (Uint16)((src[0]<<8)|src[1]); rf = (Uint16)((src[2]<<8)|src[3]); ce = (lf/2) + (rf/2); rr = lf - ce; lr = rf - ce; dst[1] = (lf&0xFF); dst[0] = ((lf>>8)&0xFF); dst[3] = (rf&0xFF); dst[2] = ((rf>>8)&0xFF); dst[1+4] = (lr&0xFF); dst[0+4] = ((lr>>8)&0xFF); dst[3+4] = (rr&0xFF); dst[2+4] = ((rr>>8)&0xFF); dst[1+8] = (ce&0xFF); dst[0+8] = ((ce>>8)&0xFF); dst[3+8] = (ce&0xFF); dst[2+8] = ((ce>>8)&0xFF); } } else { for ( i=cvt->len_cvt/4; i; --i ) { dst -= 12; src -= 4; lf = (Uint16)((src[1]<<8)|src[0]); rf = (Uint16)((src[3]<<8)|src[2]); ce = (lf/2) + (rf/2); rr = lf - ce; lr = rf - ce; dst[0] = (lf&0xFF); dst[1] = ((lf>>8)&0xFF); dst[2] = (rf&0xFF); dst[3] = ((rf>>8)&0xFF); dst[0+4] = (lr&0xFF); dst[1+4] = ((lr>>8)&0xFF); dst[2+4] = (rr&0xFF); dst[3+4] = ((rr>>8)&0xFF); dst[0+8] = (ce&0xFF); dst[1+8] = ((ce>>8)&0xFF); dst[2+8] = (ce&0xFF); dst[3+8] = ((ce>>8)&0xFF); } } } break; case AUDIO_S16: { Uint8 *src, *dst; Sint16 lf, rf, ce, lr, rr; src = cvt->buf+cvt->len_cvt; dst = cvt->buf+cvt->len_cvt*3; if ( (format & 0x1000) == 0x1000 ) { for ( i=cvt->len_cvt/4; i; --i ) { dst -= 12; src -= 4; lf = (Sint16)((src[0]<<8)|src[1]); rf = (Sint16)((src[2]<<8)|src[3]); ce = (lf/2) + (rf/2); rr = lf - ce; lr = rf - ce; dst[1] = (lf&0xFF); dst[0] = ((lf>>8)&0xFF); dst[3] = (rf&0xFF); dst[2] = ((rf>>8)&0xFF); dst[1+4] = (lr&0xFF); dst[0+4] = ((lr>>8)&0xFF); dst[3+4] = (rr&0xFF); dst[2+4] = ((rr>>8)&0xFF); dst[1+8] = (ce&0xFF); dst[0+8] = ((ce>>8)&0xFF); dst[3+8] = (ce&0xFF); dst[2+8] = ((ce>>8)&0xFF); } } else { for ( i=cvt->len_cvt/4; i; --i ) { dst -= 12; src -= 4; lf = (Sint16)((src[1]<<8)|src[0]); rf = (Sint16)((src[3]<<8)|src[2]); ce = (lf/2) + (rf/2); rr = lf - ce; lr = rf - ce; dst[0] = (lf&0xFF); dst[1] = ((lf>>8)&0xFF); dst[2] = (rf&0xFF); dst[3] = ((rf>>8)&0xFF); dst[0+4] = (lr&0xFF); dst[1+4] = ((lr>>8)&0xFF); dst[2+4] = (rr&0xFF); dst[3+4] = ((rr>>8)&0xFF); dst[0+8] = (ce&0xFF); dst[1+8] = ((ce>>8)&0xFF); dst[2+8] = (ce&0xFF); dst[3+8] = ((ce>>8)&0xFF); } } } break; } cvt->len_cvt *= 3; if ( cvt->filters[++cvt->filter_index] ) { cvt->filters[cvt->filter_index](cvt, format); } } /* Duplicate a stereo channel to a pseudo-4.0 stream */ void SDL_ConvertSurround_4(SDL_AudioCVT *cvt, Uint16 format) { int i; #ifdef DEBUG_CONVERT fprintf(stderr, "Converting stereo to quad\n"); #endif switch (format&0x8018) { case AUDIO_U8: { Uint8 *src, *dst, lf, rf, ce; src = (Uint8 *)(cvt->buf+cvt->len_cvt); dst = (Uint8 *)(cvt->buf+cvt->len_cvt*2); for ( i=cvt->len_cvt; i; --i ) { dst -= 4; src -= 2; lf = src[0]; rf = src[1]; ce = (lf/2) + (rf/2); dst[0] = lf; dst[1] = rf; dst[2] = lf - ce; dst[3] = rf - ce; } } break; case AUDIO_S8: { Sint8 *src, *dst, lf, rf, ce; src = (Sint8 *)cvt->buf+cvt->len_cvt; dst = (Sint8 *)cvt->buf+cvt->len_cvt*2; for ( i=cvt->len_cvt; i; --i ) { dst -= 4; src -= 2; lf = src[0]; rf = src[1]; ce = (lf/2) + (rf/2); dst[0] = lf; dst[1] = rf; dst[2] = lf - ce; dst[3] = rf - ce; } } break; case AUDIO_U16: { Uint8 *src, *dst; Uint16 lf, rf, ce, lr, rr; src = cvt->buf+cvt->len_cvt; dst = cvt->buf+cvt->len_cvt*2; if ( (format & 0x1000) == 0x1000 ) { for ( i=cvt->len_cvt/4; i; --i ) { dst -= 8; src -= 4; lf = (Uint16)((src[0]<<8)|src[1]); rf = (Uint16)((src[2]<<8)|src[3]); ce = (lf/2) + (rf/2); rr = lf - ce; lr = rf - ce; dst[1] = (lf&0xFF); dst[0] = ((lf>>8)&0xFF); dst[3] = (rf&0xFF); dst[2] = ((rf>>8)&0xFF); dst[1+4] = (lr&0xFF); dst[0+4] = ((lr>>8)&0xFF); dst[3+4] = (rr&0xFF); dst[2+4] = ((rr>>8)&0xFF); } } else { for ( i=cvt->len_cvt/4; i; --i ) { dst -= 8; src -= 4; lf = (Uint16)((src[1]<<8)|src[0]); rf = (Uint16)((src[3]<<8)|src[2]); ce = (lf/2) + (rf/2); rr = lf - ce; lr = rf - ce; dst[0] = (lf&0xFF); dst[1] = ((lf>>8)&0xFF); dst[2] = (rf&0xFF); dst[3] = ((rf>>8)&0xFF); dst[0+4] = (lr&0xFF); dst[1+4] = ((lr>>8)&0xFF); dst[2+4] = (rr&0xFF); dst[3+4] = ((rr>>8)&0xFF); } } } break; case AUDIO_S16: { Uint8 *src, *dst; Sint16 lf, rf, ce, lr, rr; src = cvt->buf+cvt->len_cvt; dst = cvt->buf+cvt->len_cvt*2; if ( (format & 0x1000) == 0x1000 ) { for ( i=cvt->len_cvt/4; i; --i ) { dst -= 8; src -= 4; lf = (Sint16)((src[0]<<8)|src[1]); rf = (Sint16)((src[2]<<8)|src[3]); ce = (lf/2) + (rf/2); rr = lf - ce; lr = rf - ce; dst[1] = (lf&0xFF); dst[0] = ((lf>>8)&0xFF); dst[3] = (rf&0xFF); dst[2] = ((rf>>8)&0xFF); dst[1+4] = (lr&0xFF); dst[0+4] = ((lr>>8)&0xFF); dst[3+4] = (rr&0xFF); dst[2+4] = ((rr>>8)&0xFF); } } else { for ( i=cvt->len_cvt/4; i; --i ) { dst -= 8; src -= 4; lf = (Sint16)((src[1]<<8)|src[0]); rf = (Sint16)((src[3]<<8)|src[2]); ce = (lf/2) + (rf/2); rr = lf - ce; lr = rf - ce; dst[0] = (lf&0xFF); dst[1] = ((lf>>8)&0xFF); dst[2] = (rf&0xFF); dst[3] = ((rf>>8)&0xFF); dst[0+4] = (lr&0xFF); dst[1+4] = ((lr>>8)&0xFF); dst[2+4] = (rr&0xFF); dst[3+4] = ((rr>>8)&0xFF); } } } break; } cvt->len_cvt *= 2; if ( cvt->filters[++cvt->filter_index] ) { cvt->filters[cvt->filter_index](cvt, format); } } /* Convert 8-bit to 16-bit - LSB */ void SDL_Convert16LSB(SDL_AudioCVT *cvt, Uint16 format) { int i; Uint8 *src, *dst; #ifdef DEBUG_CONVERT fprintf(stderr, "Converting to 16-bit LSB\n"); #endif src = cvt->buf+cvt->len_cvt; dst = cvt->buf+cvt->len_cvt*2; for ( i=cvt->len_cvt; i; --i ) { src -= 1; dst -= 2; dst[1] = *src; dst[0] = 0; } format = ((format & ~0x0008) | AUDIO_U16LSB); cvt->len_cvt *= 2; if ( cvt->filters[++cvt->filter_index] ) { cvt->filters[cvt->filter_index](cvt, format); } } /* Convert 8-bit to 16-bit - MSB */ void SDL_Convert16MSB(SDL_AudioCVT *cvt, Uint16 format) { int i; Uint8 *src, *dst; #ifdef DEBUG_CONVERT fprintf(stderr, "Converting to 16-bit MSB\n"); #endif src = cvt->buf+cvt->len_cvt; dst = cvt->buf+cvt->len_cvt*2; for ( i=cvt->len_cvt; i; --i ) { src -= 1; dst -= 2; dst[0] = *src; dst[1] = 0; } format = ((format & ~0x0008) | AUDIO_U16MSB); cvt->len_cvt *= 2; if ( cvt->filters[++cvt->filter_index] ) { cvt->filters[cvt->filter_index](cvt, format); } } /* Convert 16-bit to 8-bit */ void SDL_Convert8(SDL_AudioCVT *cvt, Uint16 format) { int i; Uint8 *src, *dst; #ifdef DEBUG_CONVERT fprintf(stderr, "Converting to 8-bit\n"); #endif src = cvt->buf; dst = cvt->buf; if ( (format & 0x1000) != 0x1000 ) { /* Little endian */ ++src; } for ( i=cvt->len_cvt/2; i; --i ) { *dst = *src; src += 2; dst += 1; } format = ((format & ~0x9010) | AUDIO_U8); cvt->len_cvt /= 2; if ( cvt->filters[++cvt->filter_index] ) { cvt->filters[cvt->filter_index](cvt, format); } } /* Toggle signed/unsigned */ void SDL_ConvertSign(SDL_AudioCVT *cvt, Uint16 format) { int i; Uint8 *data; #ifdef DEBUG_CONVERT fprintf(stderr, "Converting audio signedness\n"); #endif data = cvt->buf; if ( (format & 0xFF) == 16 ) { if ( (format & 0x1000) != 0x1000 ) { /* Little endian */ ++data; } for ( i=cvt->len_cvt/2; i; --i ) { *data ^= 0x80; data += 2; } } else { for ( i=cvt->len_cvt; i; --i ) { *data++ ^= 0x80; } } format = (format ^ 0x8000); if ( cvt->filters[++cvt->filter_index] ) { cvt->filters[cvt->filter_index](cvt, format); } } /* Toggle endianness */ void SDL_ConvertEndian(SDL_AudioCVT *cvt, Uint16 format) { int i; Uint8 *data, tmp; #ifdef DEBUG_CONVERT fprintf(stderr, "Converting audio endianness\n"); #endif data = cvt->buf; for ( i=cvt->len_cvt/2; i; --i ) { tmp = data[0]; data[0] = data[1]; data[1] = tmp; data += 2; } format = (format ^ 0x1000); if ( cvt->filters[++cvt->filter_index] ) { cvt->filters[cvt->filter_index](cvt, format); } } /* Convert rate up by multiple of 2 */ void SDL_RateMUL2(SDL_AudioCVT *cvt, Uint16 format) { int i; Uint8 *src, *dst; #ifdef DEBUG_CONVERT fprintf(stderr, "Converting audio rate * 2\n"); #endif src = cvt->buf+cvt->len_cvt; dst = cvt->buf+cvt->len_cvt*2; switch (format & 0xFF) { case 8: for ( i=cvt->len_cvt; i; --i ) { src -= 1; dst -= 2; dst[0] = src[0]; dst[1] = src[0]; } break; case 16: for ( i=cvt->len_cvt/2; i; --i ) { src -= 2; dst -= 4; dst[0] = src[0]; dst[1] = src[1]; dst[2] = src[0]; dst[3] = src[1]; } break; } cvt->len_cvt *= 2; if ( cvt->filters[++cvt->filter_index] ) { cvt->filters[cvt->filter_index](cvt, format); } } /* Convert rate up by multiple of 2, for stereo */ void SDL_RateMUL2_c2(SDL_AudioCVT *cvt, Uint16 format) { int i; Uint8 *src, *dst; #ifdef DEBUG_CONVERT fprintf(stderr, "Converting audio rate * 2\n"); #endif src = cvt->buf+cvt->len_cvt; dst = cvt->buf+cvt->len_cvt*2; switch (format & 0xFF) { case 8: for ( i=cvt->len_cvt/2; i; --i ) { src -= 2; dst -= 4; dst[0] = src[0]; dst[1] = src[1]; dst[2] = src[0]; dst[3] = src[1]; } break; case 16: for ( i=cvt->len_cvt/4; i; --i ) { src -= 4; dst -= 8; dst[0] = src[0]; dst[1] = src[1]; dst[2] = src[2]; dst[3] = src[3]; dst[4] = src[0]; dst[5] = src[1]; dst[6] = src[2]; dst[7] = src[3]; } break; } cvt->len_cvt *= 2; if ( cvt->filters[++cvt->filter_index] ) { cvt->filters[cvt->filter_index](cvt, format); } } /* Convert rate up by multiple of 2, for quad */ void SDL_RateMUL2_c4(SDL_AudioCVT *cvt, Uint16 format) { int i; Uint8 *src, *dst; #ifdef DEBUG_CONVERT fprintf(stderr, "Converting audio rate * 2\n"); #endif src = cvt->buf+cvt->len_cvt; dst = cvt->buf+cvt->len_cvt*2; switch (format & 0xFF) { case 8: for ( i=cvt->len_cvt/4; i; --i ) { src -= 4; dst -= 8; dst[0] = src[0]; dst[1] = src[1]; dst[2] = src[2]; dst[3] = src[3]; dst[4] = src[0]; dst[5] = src[1]; dst[6] = src[2]; dst[7] = src[3]; } break; case 16: for ( i=cvt->len_cvt/8; i; --i ) { src -= 8; dst -= 16; dst[0] = src[0]; dst[1] = src[1]; dst[2] = src[2]; dst[3] = src[3]; dst[4] = src[4]; dst[5] = src[5]; dst[6] = src[6]; dst[7] = src[7]; dst[8] = src[0]; dst[9] = src[1]; dst[10] = src[2]; dst[11] = src[3]; dst[12] = src[4]; dst[13] = src[5]; dst[14] = src[6]; dst[15] = src[7]; } break; } cvt->len_cvt *= 2; if ( cvt->filters[++cvt->filter_index] ) { cvt->filters[cvt->filter_index](cvt, format); } } /* Convert rate up by multiple of 2, for 5.1 */ void SDL_RateMUL2_c6(SDL_AudioCVT *cvt, Uint16 format) { int i; Uint8 *src, *dst; #ifdef DEBUG_CONVERT fprintf(stderr, "Converting audio rate * 2\n"); #endif src = cvt->buf+cvt->len_cvt; dst = cvt->buf+cvt->len_cvt*2; switch (format & 0xFF) { case 8: for ( i=cvt->len_cvt/6; i; --i ) { src -= 6; dst -= 12; dst[0] = src[0]; dst[1] = src[1]; dst[2] = src[2]; dst[3] = src[3]; dst[4] = src[4]; dst[5] = src[5]; dst[6] = src[0]; dst[7] = src[1]; dst[8] = src[2]; dst[9] = src[3]; dst[10] = src[4]; dst[11] = src[5]; } break; case 16: for ( i=cvt->len_cvt/12; i; --i ) { src -= 12; dst -= 24; dst[0] = src[0]; dst[1] = src[1]; dst[2] = src[2]; dst[3] = src[3]; dst[4] = src[4]; dst[5] = src[5]; dst[6] = src[6]; dst[7] = src[7]; dst[8] = src[8]; dst[9] = src[9]; dst[10] = src[10]; dst[11] = src[11]; dst[12] = src[0]; dst[13] = src[1]; dst[14] = src[2]; dst[15] = src[3]; dst[16] = src[4]; dst[17] = src[5]; dst[18] = src[6]; dst[19] = src[7]; dst[20] = src[8]; dst[21] = src[9]; dst[22] = src[10]; dst[23] = src[11]; } break; } cvt->len_cvt *= 2; if ( cvt->filters[++cvt->filter_index] ) { cvt->filters[cvt->filter_index](cvt, format); } } /* Convert rate down by multiple of 2 */ void SDL_RateDIV2(SDL_AudioCVT *cvt, Uint16 format) { int i; Uint8 *src, *dst; #ifdef DEBUG_CONVERT fprintf(stderr, "Converting audio rate / 2\n"); #endif src = cvt->buf; dst = cvt->buf; switch (format & 0xFF) { case 8: for ( i=cvt->len_cvt/2; i; --i ) { dst[0] = src[0]; src += 2; dst += 1; } break; case 16: for ( i=cvt->len_cvt/4; i; --i ) { dst[0] = src[0]; dst[1] = src[1]; src += 4; dst += 2; } break; } cvt->len_cvt /= 2; if ( cvt->filters[++cvt->filter_index] ) { cvt->filters[cvt->filter_index](cvt, format); } } /* Convert rate down by multiple of 2, for stereo */ void SDL_RateDIV2_c2(SDL_AudioCVT *cvt, Uint16 format) { int i; Uint8 *src, *dst; #ifdef DEBUG_CONVERT fprintf(stderr, "Converting audio rate / 2\n"); #endif src = cvt->buf; dst = cvt->buf; switch (format & 0xFF) { case 8: for ( i=cvt->len_cvt/4; i; --i ) { dst[0] = src[0]; dst[1] = src[1]; src += 4; dst += 2; } break; case 16: for ( i=cvt->len_cvt/8; i; --i ) { dst[0] = src[0]; dst[1] = src[1]; dst[2] = src[2]; dst[3] = src[3]; src += 8; dst += 4; } break; } cvt->len_cvt /= 2; if ( cvt->filters[++cvt->filter_index] ) { cvt->filters[cvt->filter_index](cvt, format); } } /* Convert rate down by multiple of 2, for quad */ void SDL_RateDIV2_c4(SDL_AudioCVT *cvt, Uint16 format) { int i; Uint8 *src, *dst; #ifdef DEBUG_CONVERT fprintf(stderr, "Converting audio rate / 2\n"); #endif src = cvt->buf; dst = cvt->buf; switch (format & 0xFF) { case 8: for ( i=cvt->len_cvt/8; i; --i ) { dst[0] = src[0]; dst[1] = src[1]; dst[2] = src[2]; dst[3] = src[3]; src += 8; dst += 4; } break; case 16: for ( i=cvt->len_cvt/16; i; --i ) { dst[0] = src[0]; dst[1] = src[1]; dst[2] = src[2]; dst[3] = src[3]; dst[4] = src[4]; dst[5] = src[5]; dst[6] = src[6]; dst[7] = src[7]; src += 16; dst += 8; } break; } cvt->len_cvt /= 2; if ( cvt->filters[++cvt->filter_index] ) { cvt->filters[cvt->filter_index](cvt, format); } } /* Convert rate down by multiple of 2, for 5.1 */ void SDL_RateDIV2_c6(SDL_AudioCVT *cvt, Uint16 format) { int i; Uint8 *src, *dst; #ifdef DEBUG_CONVERT fprintf(stderr, "Converting audio rate / 2\n"); #endif src = cvt->buf; dst = cvt->buf; switch (format & 0xFF) { case 8: for ( i=cvt->len_cvt/12; i; --i ) { dst[0] = src[0]; dst[1] = src[1]; dst[2] = src[2]; dst[3] = src[3]; dst[4] = src[4]; dst[5] = src[5]; src += 12; dst += 6; } break; case 16: for ( i=cvt->len_cvt/24; i; --i ) { dst[0] = src[0]; dst[1] = src[1]; dst[2] = src[2]; dst[3] = src[3]; dst[4] = src[4]; dst[5] = src[5]; dst[6] = src[6]; dst[7] = src[7]; dst[8] = src[8]; dst[9] = src[9]; dst[10] = src[10]; dst[11] = src[11]; src += 24; dst += 12; } break; } cvt->len_cvt /= 2; if ( cvt->filters[++cvt->filter_index] ) { cvt->filters[cvt->filter_index](cvt, format); } } /* Very slow rate conversion routine */ void SDL_RateSLOW(SDL_AudioCVT *cvt, Uint16 format) { double ipos; int i, clen; #ifdef DEBUG_CONVERT fprintf(stderr, "Converting audio rate * %4.4f\n", 1.0/cvt->rate_incr); #endif clen = (int)((double)cvt->len_cvt / cvt->rate_incr); if ( cvt->rate_incr > 1.0 ) { switch (format & 0xFF) { case 8: { Uint8 *output; output = cvt->buf; ipos = 0.0; for ( i=clen; i; --i ) { *output = cvt->buf[(int)ipos]; ipos += cvt->rate_incr; output += 1; } } break; case 16: { Uint16 *output; clen &= ~1; output = (Uint16 *)cvt->buf; ipos = 0.0; for ( i=clen/2; i; --i ) { *output=((Uint16 *)cvt->buf)[(int)ipos]; ipos += cvt->rate_incr; output += 1; } } break; } } else { switch (format & 0xFF) { case 8: { Uint8 *output; output = cvt->buf+clen; ipos = (double)cvt->len_cvt; for ( i=clen; i; --i ) { ipos -= cvt->rate_incr; output -= 1; *output = cvt->buf[(int)ipos]; } } break; case 16: { Uint16 *output; clen &= ~1; output = (Uint16 *)(cvt->buf+clen); ipos = (double)cvt->len_cvt/2; for ( i=clen/2; i; --i ) { ipos -= cvt->rate_incr; output -= 1; *output=((Uint16 *)cvt->buf)[(int)ipos]; } } break; } } cvt->len_cvt = clen; if ( cvt->filters[++cvt->filter_index] ) { cvt->filters[cvt->filter_index](cvt, format); } } int SDL_ConvertAudio(SDL_AudioCVT *cvt) { /* Make sure there's data to convert */ if ( cvt->buf == NULL ) { SDL_SetError("No buffer allocated for conversion"); return(-1); } /* Return okay if no conversion is necessary */ cvt->len_cvt = cvt->len; if ( cvt->filters[0] == NULL ) { return(0); } /* Set up the conversion and go! */ cvt->filter_index = 0; cvt->filters[0](cvt, cvt->src_format); return(0); } /* Creates a set of audio filters to convert from one format to another. Returns -1 if the format conversion is not supported, or 1 if the audio filter is set up. */ int SDL_BuildAudioCVT(SDL_AudioCVT *cvt, Uint16 src_format, Uint8 src_channels, int src_rate, Uint16 dst_format, Uint8 dst_channels, int dst_rate) { /*printf("Build format %04x->%04x, channels %u->%u, rate %d->%d\n", src_format, dst_format, src_channels, dst_channels, src_rate, dst_rate);*/ /* Start off with no conversion necessary */ cvt->needed = 0; cvt->filter_index = 0; cvt->filters[0] = NULL; cvt->len_mult = 1; cvt->len_ratio = 1.0; /* First filter: Endian conversion from src to dst */ if ( (src_format & 0x1000) != (dst_format & 0x1000) && ((src_format & 0xff) != 8) ) { cvt->filters[cvt->filter_index++] = SDL_ConvertEndian; } /* Second filter: Sign conversion -- signed/unsigned */ if ( (src_format & 0x8000) != (dst_format & 0x8000) ) { cvt->filters[cvt->filter_index++] = SDL_ConvertSign; } /* Next filter: Convert 16 bit <--> 8 bit PCM */ if ( (src_format & 0xFF) != (dst_format & 0xFF) ) { switch (dst_format&0x10FF) { case AUDIO_U8: cvt->filters[cvt->filter_index++] = SDL_Convert8; cvt->len_ratio /= 2; break; case AUDIO_U16LSB: cvt->filters[cvt->filter_index++] = SDL_Convert16LSB; cvt->len_mult *= 2; cvt->len_ratio *= 2; break; case AUDIO_U16MSB: cvt->filters[cvt->filter_index++] = SDL_Convert16MSB; cvt->len_mult *= 2; cvt->len_ratio *= 2; break; } } /* Last filter: Mono/Stereo conversion */ if ( src_channels != dst_channels ) { if ( (src_channels == 1) && (dst_channels > 1) ) { cvt->filters[cvt->filter_index++] = SDL_ConvertStereo; cvt->len_mult *= 2; src_channels = 2; cvt->len_ratio *= 2; } if ( (src_channels == 2) && (dst_channels == 6) ) { cvt->filters[cvt->filter_index++] = SDL_ConvertSurround; src_channels = 6; cvt->len_mult *= 3; cvt->len_ratio *= 3; } if ( (src_channels == 2) && (dst_channels == 4) ) { cvt->filters[cvt->filter_index++] = SDL_ConvertSurround_4; src_channels = 4; cvt->len_mult *= 2; cvt->len_ratio *= 2; } while ( (src_channels*2) <= dst_channels ) { cvt->filters[cvt->filter_index++] = SDL_ConvertStereo; cvt->len_mult *= 2; src_channels *= 2; cvt->len_ratio *= 2; } if ( (src_channels == 6) && (dst_channels <= 2) ) { cvt->filters[cvt->filter_index++] = SDL_ConvertStrip; src_channels = 2; cvt->len_ratio /= 3; } if ( (src_channels == 6) && (dst_channels == 4) ) { cvt->filters[cvt->filter_index++] = SDL_ConvertStrip_2; src_channels = 4; cvt->len_ratio /= 2; } /* This assumes that 4 channel audio is in the format: Left {front/back} + Right {front/back} so converting to L/R stereo works properly. */ while ( ((src_channels%2) == 0) && ((src_channels/2) >= dst_channels) ) { cvt->filters[cvt->filter_index++] = SDL_ConvertMono; src_channels /= 2; cvt->len_ratio /= 2; } if ( src_channels != dst_channels ) { /* Uh oh.. */; } } /* Do rate conversion */ cvt->rate_incr = 0.0; if ( (src_rate/100) != (dst_rate/100) ) { Uint32 hi_rate, lo_rate; int len_mult; double len_ratio; void (*rate_cvt)(SDL_AudioCVT *cvt, Uint16 format); if ( src_rate > dst_rate ) { hi_rate = src_rate; lo_rate = dst_rate; switch (src_channels) { case 1: rate_cvt = SDL_RateDIV2; break; case 2: rate_cvt = SDL_RateDIV2_c2; break; case 4: rate_cvt = SDL_RateDIV2_c4; break; case 6: rate_cvt = SDL_RateDIV2_c6; break; default: return -1; } len_mult = 1; len_ratio = 0.5; } else { hi_rate = dst_rate; lo_rate = src_rate; switch (src_channels) { case 1: rate_cvt = SDL_RateMUL2; break; case 2: rate_cvt = SDL_RateMUL2_c2; break; case 4: rate_cvt = SDL_RateMUL2_c4; break; case 6: rate_cvt = SDL_RateMUL2_c6; break; default: return -1; } len_mult = 2; len_ratio = 2.0; } /* If hi_rate = lo_rate*2^x then conversion is easy */ while ( ((lo_rate*2)/100) <= (hi_rate/100) ) { cvt->filters[cvt->filter_index++] = rate_cvt; cvt->len_mult *= len_mult; lo_rate *= 2; cvt->len_ratio *= len_ratio; } /* We may need a slow conversion here to finish up */ if ( (lo_rate/100) != (hi_rate/100) ) { #if 1 /* The problem with this is that if the input buffer is say 1K, and the conversion rate is say 1.1, then the output buffer is 1.1K, which may not be an acceptable buffer size for the audio driver (not a power of 2) */ /* For now, punt and hope the rate distortion isn't great. */ #else if ( src_rate < dst_rate ) { cvt->rate_incr = (double)lo_rate/hi_rate; cvt->len_mult *= 2; cvt->len_ratio /= cvt->rate_incr; } else { cvt->rate_incr = (double)hi_rate/lo_rate; cvt->len_ratio *= cvt->rate_incr; } cvt->filters[cvt->filter_index++] = SDL_RateSLOW; #endif } } /* Set up the filter information */ if ( cvt->filter_index != 0 ) { cvt->needed = 1; cvt->src_format = src_format; cvt->dst_format = dst_format; cvt->len = 0; cvt->buf = NULL; cvt->filters[cvt->filter_index] = NULL; } return(cvt->needed); }