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SDL_mintaudio.h
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SDL_mintaudio.h
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2012 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
*/
#include "SDL_config.h"
/*
MiNT audio driver
Patrice Mandin
*/
#ifndef _SDL_mintaudio_h
#define _SDL_mintaudio_h
#include "../SDL_sysaudio.h"
#include "SDL_mintaudio_stfa.h"
/* Hidden "this" pointer for the audio functions */
#define _THIS SDL_AudioDevice *this
/* 16 predivisors with 3 clocks max. */
#define MINTAUDIO_maxfreqs (16*3)
typedef struct {
Uint32 frequency;
Uint32 masterclock;
Uint32 predivisor;
int gpio_bits; /* in case of external clock */
} mint_frequency_t;
struct SDL_PrivateAudioData {
mint_frequency_t frequencies[MINTAUDIO_maxfreqs];
int freq_count; /* Number of frequencies in the array */
int numfreq; /* Number of selected frequency */
Uint8 *audiobuf[2]; /* DMA buffers */
Uint8 *fastrambuf; /* Intermediate buffer to be filled by application */
int audiosize; /* and their size, variable depending on latency */
void (*swapbuf)(Uint8 *nextbuf, int nextsize); /* Routine to swap DMA buffers */
};
/* Old variable names */
#define MINTAUDIO_frequencies (this->hidden->frequencies)
#define MINTAUDIO_freqcount (this->hidden->freq_count)
#define MINTAUDIO_numfreq (this->hidden->numfreq)
#define MINTAUDIO_swapbuf (this->hidden->swapbuf)
#define MINTAUDIO_audiobuf (this->hidden->audiobuf)
#define MINTAUDIO_fastrambuf (this->hidden->fastrambuf)
#define MINTAUDIO_audiosize (this->hidden->audiosize)
/* _MCH cookie (values>>16) */
enum {
MCH_ST=0,
MCH_STE,
MCH_TT,
MCH_F30,
MCH_CLONE,
MCH_ARANYM
};
/* 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
/* Variables */
extern SDL_AudioDevice *SDL_MintAudio_device;
/* 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;
/* Functions */
void SDL_AtariMint_UpdateAudio(void);
int SDL_MintAudio_InitBuffers(SDL_AudioSpec *spec);
void SDL_MintAudio_FreeBuffers(void);
void SDL_MintAudio_AddFrequency(_THIS, Uint32 frequency, Uint32 clock,
Uint32 prediv, int gpio_bits);
int SDL_MintAudio_SearchFrequency(_THIS, int desired_freq);
/* MiNT thread functions */
int SDL_MintAudio_Thread(long param);
void SDL_MintAudio_WaitThread(void);
/*--- SDL_mintaudio_it.S stuff ---*/
/* Variables */
extern volatile unsigned long SDL_MintAudio_clocktics;
extern volatile unsigned long SDL_MintAudio_num_its;
extern volatile void *SDL_MintAudio_itbuffer;
extern volatile unsigned long SDL_MintAudio_itbuflen;
extern volatile unsigned long SDL_MintAudio_itsilence;
/* Functions */
void SDL_MintAudio_XbiosInterruptMeasureClock(void);
void SDL_MintAudio_XbiosInterrupt(void);
void SDL_MintAudio_Dma8Interrupt(void);
void SDL_MintAudio_StfaInterrupt(void);
#endif /* _SDL_mintaudio_h */