SDL_mintaudio.h
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SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2004 Sam Lantinga
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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
*/
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#include "SDL_config.h"
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/*
MiNT audio driver
Patrice Mandin
*/
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#ifndef _SDL_mintaudio_h
#define _SDL_mintaudio_h
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#include "../SDL_sysaudio.h"
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#include "SDL_mintaudio_stfa.h"
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/* Hidden "this" pointer for the audio functions */
#define _THIS SDL_AudioDevice *this
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/* 16 predivisors with 3 clocks max. */
#define MINTAUDIO_maxfreqs (16*3)
typedef struct {
Uint32 frequency;
Uint32 masterclock;
Uint32 predivisor;
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int gpio_bits; /* in case of external clock */
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} mint_frequency_t;
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struct SDL_PrivateAudioData {
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mint_frequency_t frequencies[MINTAUDIO_maxfreqs];
int freq_count; /* Number of frequencies in the array */
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int numfreq; /* Number of selected frequency */
};
/* Old variable names */
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#define MINTAUDIO_frequencies (this->hidden->frequencies)
#define MINTAUDIO_freqcount (this->hidden->freq_count)
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#define MINTAUDIO_numfreq (this->hidden->numfreq)
/* _MCH cookie (values>>16) */
enum {
MCH_ST=0,
MCH_STE,
MCH_TT,
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MCH_F30,
MCH_CLONE,
MCH_ARANYM
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};
/* Master clocks for replay frequencies */
#define MASTERCLOCK_STE 8010666 /* Not sure of this one */
#define MASTERCLOCK_TT 16107953 /* Not sure of this one */
#define MASTERCLOCK_FALCON1 25175000
#define MASTERCLOCK_FALCON2 32000000 /* Only usable for DSP56K */
#define MASTERCLOCK_FALCONEXT -1 /* Clock on DSP56K port, unknown */
#define MASTERCLOCK_44K 22579200 /* Standard clock for 44.1 Khz */
#define MASTERCLOCK_48K 24576000 /* Standard clock for 48 Khz */
/* Master clock predivisors */
#define MASTERPREDIV_STE 160
#define MASTERPREDIV_TT 320
#define MASTERPREDIV_FALCON 256
#define MASTERPREDIV_MILAN 256
/* MFP 68901 interrupt sources */
enum {
MFP_PARALLEL=0,
MFP_DCD,
MFP_CTS,
MFP_BITBLT,
MFP_TIMERD,
MFP_BAUDRATE=MFP_TIMERD,
MFP_TIMERC,
MFP_200HZ=MFP_TIMERC,
MFP_ACIA,
MFP_DISK,
MFP_TIMERB,
MFP_HBLANK=MFP_TIMERB,
MFP_TERR,
MFP_TBE,
MFP_RERR,
MFP_RBF,
MFP_TIMERA,
MFP_DMASOUND=MFP_TIMERA,
MFP_RING,
MFP_MONODETECT
};
/* Xbtimer() timers */
enum {
XB_TIMERA=0,
XB_TIMERB,
XB_TIMERC,
XB_TIMERD
};
/* Variables */
extern SDL_AudioDevice *SDL_MintAudio_device;
extern Uint8 *SDL_MintAudio_audiobuf[2]; /* Pointers to buffers */
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extern unsigned long SDL_MintAudio_audiosize; /* Length of audio buffer=spec->size */
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extern volatile unsigned short SDL_MintAudio_numbuf; /* Buffer to play */
extern volatile unsigned short SDL_MintAudio_mutex;
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extern cookie_stfa_t *SDL_MintAudio_stfa;
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extern volatile unsigned long SDL_MintAudio_clocktics;
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/* MiNT thread variables */
extern SDL_bool SDL_MintAudio_mint_present;
extern SDL_bool SDL_MintAudio_quit_thread;
extern SDL_bool SDL_MintAudio_thread_finished;
extern long SDL_MintAudio_thread_pid;
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/* Functions */
void SDL_MintAudio_Callback(void);
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void SDL_MintAudio_AddFrequency(_THIS, Uint32 frequency, Uint32 clock,
Uint32 prediv, int gpio_bits);
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int SDL_MintAudio_SearchFrequency(_THIS, int desired_freq);
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/* MiNT thread functions */
int SDL_MintAudio_Thread(long param);
void SDL_MintAudio_WaitThread(void);
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/* ASM interrupt functions */
void SDL_MintAudio_GsxbInterrupt(void);
void SDL_MintAudio_EmptyGsxbInterrupt(void);
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void SDL_MintAudio_XbiosInterruptMeasureClock(void);
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void SDL_MintAudio_XbiosInterrupt(void);
void SDL_MintAudio_Dma8Interrupt(void);
void SDL_MintAudio_StfaInterrupt(void);
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#endif /* _SDL_mintaudio_h */