336e30592d
--HG-- branch : SDL-1.2 extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/branches/SDL-1.2%402088
153 lines
4.2 KiB
C
153 lines
4.2 KiB
C
/*
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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
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/*
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MiNT audio driver
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Patrice Mandin
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*/
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#ifndef _SDL_mintaudio_h
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#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 */
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#define _THIS SDL_AudioDevice *this
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/* 16 predivisors with 3 clocks max. */
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#define MINTAUDIO_maxfreqs (16*3)
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typedef struct {
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Uint32 frequency;
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Uint32 masterclock;
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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];
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int freq_count; /* Number of frequencies in the array */
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int numfreq; /* Number of selected frequency */
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};
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/* Old variable names */
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#define MINTAUDIO_frequencies (this->hidden->frequencies)
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#define MINTAUDIO_freqcount (this->hidden->freq_count)
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#define MINTAUDIO_numfreq (this->hidden->numfreq)
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/* _MCH cookie (values>>16) */
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enum {
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MCH_ST=0,
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MCH_STE,
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MCH_TT,
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MCH_F30,
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MCH_CLONE,
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MCH_ARANYM
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};
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/* Master clocks for replay frequencies */
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#define MASTERCLOCK_STE 8010666 /* Not sure of this one */
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#define MASTERCLOCK_TT 16107953 /* Not sure of this one */
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#define MASTERCLOCK_FALCON1 25175000
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#define MASTERCLOCK_FALCON2 32000000 /* Only usable for DSP56K */
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#define MASTERCLOCK_FALCONEXT -1 /* Clock on DSP56K port, unknown */
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#define MASTERCLOCK_44K 22579200 /* Standard clock for 44.1 Khz */
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#define MASTERCLOCK_48K 24576000 /* Standard clock for 48 Khz */
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/* Master clock predivisors */
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#define MASTERPREDIV_STE 160
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#define MASTERPREDIV_TT 320
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#define MASTERPREDIV_FALCON 256
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#define MASTERPREDIV_MILAN 256
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/* MFP 68901 interrupt sources */
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enum {
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MFP_PARALLEL=0,
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MFP_DCD,
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MFP_CTS,
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MFP_BITBLT,
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MFP_TIMERD,
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MFP_BAUDRATE=MFP_TIMERD,
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MFP_TIMERC,
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MFP_200HZ=MFP_TIMERC,
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MFP_ACIA,
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MFP_DISK,
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MFP_TIMERB,
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MFP_HBLANK=MFP_TIMERB,
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MFP_TERR,
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MFP_TBE,
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MFP_RERR,
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MFP_RBF,
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MFP_TIMERA,
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MFP_DMASOUND=MFP_TIMERA,
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MFP_RING,
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MFP_MONODETECT
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};
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/* Xbtimer() timers */
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enum {
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XB_TIMERA=0,
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XB_TIMERB,
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XB_TIMERC,
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XB_TIMERD
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};
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/* Variables */
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extern SDL_AudioDevice *SDL_MintAudio_device;
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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 */
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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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extern unsigned short SDL_MintAudio_hasfpu; /* To preserve fpu registers if needed */
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/* MiNT thread variables */
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extern SDL_bool SDL_MintAudio_mint_present;
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extern SDL_bool SDL_MintAudio_quit_thread;
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extern SDL_bool SDL_MintAudio_thread_finished;
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extern long SDL_MintAudio_thread_pid;
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/* Functions */
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void SDL_MintAudio_Callback(void);
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void SDL_MintAudio_AddFrequency(_THIS, Uint32 frequency, Uint32 clock,
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Uint32 prediv, int gpio_bits);
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int SDL_MintAudio_SearchFrequency(_THIS, int desired_freq);
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void SDL_MintAudio_CheckFpu(void);
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/* MiNT thread functions */
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int SDL_MintAudio_Thread(long param);
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void SDL_MintAudio_WaitThread(void);
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/* ASM interrupt functions */
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void SDL_MintAudio_GsxbInterrupt(void);
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void SDL_MintAudio_EmptyGsxbInterrupt(void);
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void SDL_MintAudio_XbiosInterruptMeasureClock(void);
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void SDL_MintAudio_XbiosInterrupt(void);
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void SDL_MintAudio_Dma8Interrupt(void);
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void SDL_MintAudio_StfaInterrupt(void);
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#endif /* _SDL_mintaudio_h */
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