1/* 2 SDL - Simple DirectMedia Layer 3 Copyright (C) 1997-2012 Sam Lantinga 4 5 This library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Library General Public 7 License as published by the Free Software Foundation; either 8 version 2 of the License, or (at your option) any later version. 9 10 This library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Library General Public License for more details. 14 15 You should have received a copy of the GNU Library General Public 16 License along with this library; if not, write to the Free 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 19 Sam Lantinga 20 slouken@libsdl.org 21*/ 22#include "SDL_config.h" 23 24/* 25 MiNT audio driver 26 27 Patrice Mandin 28*/ 29 30#ifndef _SDL_mintaudio_h 31#define _SDL_mintaudio_h 32 33#include "../SDL_sysaudio.h" 34#include "SDL_mintaudio_stfa.h" 35 36/* Hidden "this" pointer for the audio functions */ 37#define _THIS SDL_AudioDevice *this 38 39/* 16 predivisors with 3 clocks max. */ 40#define MINTAUDIO_maxfreqs (16*3) 41 42typedef struct { 43 Uint32 frequency; 44 Uint32 masterclock; 45 Uint32 predivisor; 46 int gpio_bits; /* in case of external clock */ 47} mint_frequency_t; 48 49struct SDL_PrivateAudioData { 50 mint_frequency_t frequencies[MINTAUDIO_maxfreqs]; 51 int freq_count; /* Number of frequencies in the array */ 52 int numfreq; /* Number of selected frequency */ 53}; 54 55/* Old variable names */ 56 57#define MINTAUDIO_frequencies (this->hidden->frequencies) 58#define MINTAUDIO_freqcount (this->hidden->freq_count) 59#define MINTAUDIO_numfreq (this->hidden->numfreq) 60 61/* _MCH cookie (values>>16) */ 62enum { 63 MCH_ST=0, 64 MCH_STE, 65 MCH_TT, 66 MCH_F30, 67 MCH_CLONE, 68 MCH_ARANYM 69}; 70 71/* Master clocks for replay frequencies */ 72#define MASTERCLOCK_STE 8010666 /* Not sure of this one */ 73#define MASTERCLOCK_TT 16107953 /* Not sure of this one */ 74#define MASTERCLOCK_FALCON1 25175000 75#define MASTERCLOCK_FALCON2 32000000 /* Only usable for DSP56K */ 76#define MASTERCLOCK_FALCONEXT -1 /* Clock on DSP56K port, unknown */ 77#define MASTERCLOCK_44K 22579200 /* Standard clock for 44.1 Khz */ 78#define MASTERCLOCK_48K 24576000 /* Standard clock for 48 Khz */ 79 80/* Master clock predivisors */ 81#define MASTERPREDIV_STE 160 82#define MASTERPREDIV_TT 320 83#define MASTERPREDIV_FALCON 256 84#define MASTERPREDIV_MILAN 256 85 86/* Variables */ 87extern SDL_AudioDevice *SDL_MintAudio_device; 88extern Uint8 *SDL_MintAudio_audiobuf[2]; /* Pointers to buffers */ 89extern unsigned long SDL_MintAudio_audiosize; /* Length of audio buffer=spec->size */ 90extern volatile unsigned short SDL_MintAudio_numbuf; /* Buffer to play */ 91extern volatile unsigned short SDL_MintAudio_mutex; 92extern cookie_stfa_t *SDL_MintAudio_stfa; 93extern volatile unsigned long SDL_MintAudio_clocktics; 94extern unsigned short SDL_MintAudio_hasfpu; /* To preserve fpu registers if needed */ 95 96/* MiNT thread variables */ 97extern SDL_bool SDL_MintAudio_mint_present; 98extern SDL_bool SDL_MintAudio_quit_thread; 99extern SDL_bool SDL_MintAudio_thread_finished; 100extern long SDL_MintAudio_thread_pid; 101 102/* Functions */ 103void SDL_MintAudio_Callback(void); 104void SDL_MintAudio_AddFrequency(_THIS, Uint32 frequency, Uint32 clock, 105 Uint32 prediv, int gpio_bits); 106int SDL_MintAudio_SearchFrequency(_THIS, int desired_freq); 107void SDL_MintAudio_CheckFpu(void); 108 109/* MiNT thread functions */ 110int SDL_MintAudio_Thread(long param); 111void SDL_MintAudio_WaitThread(void); 112 113/* ASM interrupt functions */ 114void SDL_MintAudio_GsxbInterrupt(void); 115void SDL_MintAudio_EmptyGsxbInterrupt(void); 116void SDL_MintAudio_XbiosInterruptMeasureClock(void); 117void SDL_MintAudio_XbiosInterrupt(void); 118void SDL_MintAudio_Dma8Interrupt(void); 119void SDL_MintAudio_StfaInterrupt(void); 120 121#endif /* _SDL_mintaudio_h */ 122