Mercurial > sdl-ios-xcode
view src/audio/mint/SDL_mintaudio_stfa.h @ 968:4675910b0b7b
Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
From: Hannu Savolainen
Subject: Re: SDL uses obsolete OSS features
I did some work on getting OSS to work better with SDL. There have been
some problems with select which should be fixed now.
I'm having some problems in understanding what is the purpose of the
DSP_WaitAudio() routine. I added a return to the very beginning of this
routine and commendted out the define for USE_BLOCKING_WRITES. At least
lbreakout2 seems to work as well as earlier. The latencies are the same.
An ordinary blocking write does exactly the same thing than DSP_WaitAudio
does. So I would recommend using the USE_BLOCKING_WRITES approach and
removing everything from the DSP_WaitAudio routine. Also enabling
USE_BLOCKING_WRITES makes it possible to simplify DSP_PlayAudio() because
you don't need to handle the partial writes (the do-while loop).
Attached is a patch against SDL-1.2.7. After these changes SDL will use
OSS as it's designed to be used (make it as simple as possible). This code
should work with all OSS implementations because it uses only the very
fundamental features that have been there since the jurassic times.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 12 Nov 2004 21:39:04 +0000 |
| parents | b8d311d90021 |
| children | d910939febfa |
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/* 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 */ /* STFA control structure Patrice Mandin */ #ifndef _SDL_mintaudio_stfa_h #define _SDL_mintaudio_stfa_h /*--- Defines ---*/ #define C_STFA 0x53544641L /* Sound treiber für atari (seb/The removers) */ #define STFA_PLAY_ENABLE (1<<0) #define STFA_PLAY_DISABLE (0<<0) #define STFA_PLAY_REPEAT (1<<1) #define STFA_PLAY_SINGLE (0<<1) #define STFA_FORMAT_SIGNED (1<<15) #define STFA_FORMAT_UNSIGNED (0<<15) #define STFA_FORMAT_STEREO (1<<14) #define STFA_FORMAT_MONO (0<<14) #define STFA_FORMAT_16BIT (1<<13) #define STFA_FORMAT_8BIT (0<<13) #define STFA_FORMAT_LITENDIAN (1<<9) #define STFA_FORMAT_BIGENDIAN (0<<9) #define STFA_FORMAT_FREQ_MASK 0x0f enum { STFA_FORMAT_F4995=0, STFA_FORMAT_F6269, STFA_FORMAT_F7493, STFA_FORMAT_F8192, STFA_FORMAT_F9830, STFA_FORMAT_F10971, STFA_FORMAT_F12538, STFA_FORMAT_F14985, STFA_FORMAT_F16384, STFA_FORMAT_F19819, STFA_FORMAT_F21943, STFA_FORMAT_F24576, STFA_FORMAT_F30720, STFA_FORMAT_F32336, STFA_FORMAT_F43885, STFA_FORMAT_F49152 }; /*--- Types ---*/ typedef struct { unsigned short sound_enable; unsigned short sound_control; unsigned short sound_output; unsigned long sound_start; unsigned long sound_current; unsigned long sound_end; unsigned short version; void *old_vbl; void *old_timera; unsigned long old_mfp_status; void *new_vbl; void *drivers_list; void *play_stop; unsigned short frequency; void *set_frequency; unsigned short frequency_threshold; unsigned short *custom_freq_table; unsigned short stfa_on_off; void *new_drivers_list; unsigned long old_bit_2_of_cookie_snd; void (*stfa_it)(void); } cookie_stfa_t __attribute__((packed)); #endif /* _SDL_mintaudio_stfa_h */