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SDL_mintaudio_mcsn.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
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
using XBIOS functions (MacSound compatible driver)
Patrice Mandin
*/
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#include <support.h>
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/* Mint includes */
#include <mint/osbind.h>
#include <mint/falcon.h>
#include <mint/cookie.h>
#include "SDL_audio.h"
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#include "../SDL_audio_c.h"
#include "../SDL_sysaudio.h"
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#include "SDL_atarimxalloc_c.h"
#include "SDL_mintaudio.h"
#include "SDL_mintaudio_mcsn.h"
/*--- Defines ---*/
#define MINT_AUDIO_DRIVER_NAME "mint_mcsn"
/* Debug print info */
#define DEBUG_NAME "audio:mcsn: "
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#if 0
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#define DEBUG_PRINT(what) \
{ \
printf what; \
}
#else
#define DEBUG_PRINT(what)
#endif
/*--- Static variables ---*/
static unsigned long cookie_snd, cookie_mch;
static cookie_mcsn_t *cookie_mcsn;
/*--- Audio driver functions ---*/
static void Mint_CloseAudio(_THIS);
static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
static void Mint_LockAudio(_THIS);
static void Mint_UnlockAudio(_THIS);
/* To check/init hardware audio */
static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
/*--- Audio driver bootstrap functions ---*/
static int Audio_Available(void)
{
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unsigned long dummy;
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const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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SDL_MintAudio_mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND);
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/* We can't use XBIOS in interrupt with Magic, don't know about thread */
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if (Getcookie(C_MagX, &dummy) == C_FOUND) {
return(0);
}
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/* Check if user asked a different audio driver */
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if ((envr) && (SDL_strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
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DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
return(0);
}
/* Cookie _MCH present ? if not, assume ST machine */
if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
cookie_mch = MCH_ST;
}
/* Cookie _SND present ? if not, assume ST machine */
if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
cookie_snd = SND_PSG;
}
/* Check if we have 16 bits audio */
if ((cookie_snd & SND_16BIT)==0) {
DEBUG_PRINT((DEBUG_NAME "no 16 bits sound\n"));
return(0);
}
/* Cookie MCSN present ? */
if (Getcookie(C_McSn, (long *) &cookie_mcsn) != C_FOUND) {
DEBUG_PRINT((DEBUG_NAME "no MCSN audio\n"));
return(0);
}
/* Check if interrupt at end of replay */
if (cookie_mcsn->pint == 0) {
DEBUG_PRINT((DEBUG_NAME "no interrupt at end of replay\n"));
return(0);
}
/* Check if audio is lockable */
if (Locksnd()!=1) {
DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
return(0);
}
Unlocksnd();
DEBUG_PRINT((DEBUG_NAME "MCSN audio available!\n"));
return(1);
}
static void Audio_DeleteDevice(SDL_AudioDevice *device)
{
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SDL_free(device->hidden);
SDL_free(device);
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}
static SDL_AudioDevice *Audio_CreateDevice(int devindex)
{
SDL_AudioDevice *this;
/* Initialize all variables that we clean on shutdown */
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this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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if ( this ) {
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SDL_memset(this, 0, (sizeof *this));
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this->hidden = (struct SDL_PrivateAudioData *)
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SDL_malloc((sizeof *this->hidden));
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}
if ( (this == NULL) || (this->hidden == NULL) ) {
SDL_OutOfMemory();
if ( this ) {
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SDL_free(this);
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}
return(0);
}
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SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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/* Set the function pointers */
this->OpenAudio = Mint_OpenAudio;
this->CloseAudio = Mint_CloseAudio;
this->LockAudio = Mint_LockAudio;
this->UnlockAudio = Mint_UnlockAudio;
this->free = Audio_DeleteDevice;
return this;
}
AudioBootStrap MINTAUDIO_MCSN_bootstrap = {
MINT_AUDIO_DRIVER_NAME, "MiNT MCSN audio driver",
Audio_Available, Audio_CreateDevice
};
static void Mint_LockAudio(_THIS)
{
/* Stop replay */
Buffoper(0);
}
static void Mint_UnlockAudio(_THIS)
{
/* Restart replay */
Buffoper(SB_PLA_ENA|SB_PLA_RPT);
}
static void Mint_CloseAudio(_THIS)
{
/* Stop replay */
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SDL_MintAudio_WaitThread();
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Buffoper(0);
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if (!SDL_MintAudio_mint_present) {
/* Uninstall interrupt */
Jdisint(MFP_DMASOUND);
}
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/* Wait if currently playing sound */
while (SDL_MintAudio_mutex != 0) {
}
/* Clear buffers */
if (SDL_MintAudio_audiobuf[0]) {
Mfree(SDL_MintAudio_audiobuf[0]);
SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
}
/* Unlock sound system */
Unlocksnd();
}
static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
{
int i;
unsigned long masterclock, masterprediv;
DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
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DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
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DEBUG_PRINT(("channels=%d, ", spec->channels));
DEBUG_PRINT(("freq=%d\n", spec->freq));
/* Check formats available */
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MINTAUDIO_freqcount=0;
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switch(cookie_mcsn->play) {
case MCSN_ST:
spec->channels=1;
spec->format=8; /* FIXME: is it signed or unsigned ? */
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SDL_MintAudio_AddFrequency(this, 12500, 0, 0, -1);
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break;
case MCSN_TT: /* Also STE, Mega STE */
spec->format=AUDIO_S8;
masterclock=MASTERCLOCK_STE;
masterprediv=MASTERPREDIV_STE;
if ((cookie_mch>>16)==MCH_TT) {
masterclock=MASTERCLOCK_TT;
masterprediv=MASTERPREDIV_TT;
}
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for (i=0; i<4; i++) {
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SDL_MintAudio_AddFrequency(this, masterclock/(masterprediv*(1<<i)),
masterclock, 3-i, -1);
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}
break;
case MCSN_FALCON: /* Also Mac */
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for (i=1; i<12; i++) {
/* Remove unusable Falcon codec predivisors */
if ((i==6) || (i==8) || (i==10)) {
continue;
}
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SDL_MintAudio_AddFrequency(this, MASTERCLOCK_FALCON1/(MASTERPREDIV_FALCON*(i+1)),
CLK25M, i+1, -1);
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}
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if (cookie_mcsn->res1 != 0) {
for (i=1; i<4; i++) {
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SDL_MintAudio_AddFrequency(this, (cookie_mcsn->res1)/(MASTERPREDIV_FALCON*(1<<i)),
CLKEXT, (1<<i)-1, -1);
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}
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}
spec->format |= 0x8000; /* Audio is always signed */
if ((spec->format & 0x00ff)==16) {
spec->format |= 0x1000; /* Audio is always big endian */
spec->channels=2; /* 16 bits always stereo */
}
break;
}
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#if 1
for (i=0; i<MINTAUDIO_freqcount; i++) {
DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock,
MINTAUDIO_frequencies[i].predivisor
));
}
#endif
MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
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DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
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DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
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DEBUG_PRINT(("channels=%d, ", spec->channels));
DEBUG_PRINT(("freq=%d\n", spec->freq));
return 0;
}
static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
{
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int channels_mode, prediv, dmaclock;
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void *buffer;
/* Stop currently playing sound */
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SDL_MintAudio_quit_thread = SDL_FALSE;
SDL_MintAudio_thread_finished = SDL_TRUE;
SDL_MintAudio_WaitThread();
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Buffoper(0);
/* Set replay tracks */
Settracks(0,0);
Setmontracks(0);
/* Select replay format */
channels_mode=STEREO16;
switch (spec->format & 0xff) {
case 8:
if (spec->channels==2) {
channels_mode=STEREO8;
} else {
channels_mode=MONO8;
}
break;
}
if (Setmode(channels_mode)<0) {
DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
}
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dmaclock = MINTAUDIO_frequencies[MINTAUDIO_numfreq].masterclock;
prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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switch(cookie_mcsn->play) {
case MCSN_TT:
Devconnect(DMAPLAY, DAC, CLK25M, CLKOLD, 1);
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Soundcmd(SETPRESCALE, prediv);
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DEBUG_PRINT((DEBUG_NAME "STE/TT prescaler selected\n"));
break;
case MCSN_FALCON:
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Devconnect(DMAPLAY, DAC, dmaclock, prediv, 1);
DEBUG_PRINT((DEBUG_NAME "Falcon prescaler selected\n"));
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break;
}
/* Set buffer */
buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
if (Setbuffer(0, buffer, buffer + spec->size)<0) {
DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));
}
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if (SDL_MintAudio_mint_present) {
SDL_MintAudio_thread_pid = tfork(SDL_MintAudio_Thread, 0);
} else {
/* Install interrupt */
Jdisint(MFP_DMASOUND);
Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_XbiosInterrupt);
Jenabint(MFP_DMASOUND);
if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) {
DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
}
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}
/* Go */
Buffoper(SB_PLA_ENA|SB_PLA_RPT);
DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
}
static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
{
/* Lock sound system */
if (Locksnd()!=1) {
SDL_SetError("Mint_OpenAudio: Audio system already in use");
return(-1);
}
SDL_MintAudio_device = this;
/* Check audio capabilities */
if (Mint_CheckAudio(this, spec)==-1) {
return -1;
}
SDL_CalculateAudioSpec(spec);
/* Allocate memory for audio buffers in DMA-able RAM */
DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
if (SDL_MintAudio_audiobuf[0]==NULL) {
SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
return (-1);
}
SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
SDL_MintAudio_numbuf=0;
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SDL_memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
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SDL_MintAudio_audiosize = spec->size;
SDL_MintAudio_mutex = 0;
DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
/* Setup audio hardware */
Mint_InitAudio(this, spec);
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return(1); /* We don't use SDL threaded audio */
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}