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SDL_mintaudio_dma8.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2012 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 DMA 8bits (hardware access)
Patrice Mandin
*/
/* 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 "../../video/ataricommon/SDL_atarimxalloc_c.h"
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#include "SDL_mintaudio.h"
#include "SDL_mintaudio_dma8.h"
/*--- Defines ---*/
#define MINT_AUDIO_DRIVER_NAME "mint_dma8"
/* Debug print info */
#define DEBUG_NAME "audio:dma8: "
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#if 0
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#define DEBUG_PRINT(what) \
{ \
printf what; \
}
#else
#define DEBUG_PRINT(what)
#endif
/*--- Static variables ---*/
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static long cookie_snd, cookie_mch;
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/*--- 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);
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/* Functions called in supervisor mode */
static void Mint_InitDma(void);
static void Mint_StopReplay(void);
static void Mint_StartReplay(void);
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/*--- Audio driver bootstrap functions ---*/
static int Audio_Available(void)
{
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const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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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 8 bits audio */
if ((cookie_snd & SND_8BIT)==0) {
DEBUG_PRINT((DEBUG_NAME "no 8 bits sound\n"));
return(0);
}
/* Check if audio is lockable */
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if (cookie_snd & SND_16BIT) {
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if (Locksnd()!=1) {
DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
return(0);
}
Unlocksnd();
}
DEBUG_PRINT((DEBUG_NAME "8 bits 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_DMA8_bootstrap = {
MINT_AUDIO_DRIVER_NAME, "MiNT DMA 8 bits audio driver",
Audio_Available, Audio_CreateDevice
};
static void Mint_LockAudio(_THIS)
{
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Supexec(Mint_StopReplay);
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}
static void Mint_UnlockAudio(_THIS)
{
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Supexec(Mint_StartReplay);
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}
static void Mint_CloseAudio(_THIS)
{
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Supexec(Mint_StopReplay);
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DEBUG_PRINT((DEBUG_NAME "closeaudio: replay stopped\n"));
/* Disable interrupt */
Jdisint(MFP_DMASOUND);
DEBUG_PRINT((DEBUG_NAME "closeaudio: interrupt disabled\n"));
/* Wait if currently playing sound */
while (SDL_MintAudio_mutex != 0) {
}
DEBUG_PRINT((DEBUG_NAME "closeaudio: no more interrupt running\n"));
/* Clear buffers */
if (SDL_MintAudio_audiobuf[0]) {
Mfree(SDL_MintAudio_audiobuf[0]);
SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
}
DEBUG_PRINT((DEBUG_NAME "closeaudio: buffers freed\n"));
}
static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
{
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int i, masterprediv, sfreq;
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unsigned long masterclock;
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));
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if (spec->channels > 2)
spec->channels = 2;
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/* Check formats available */
spec->format = AUDIO_S8;
/* Calculate and select the closest frequency */
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sfreq=0;
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masterclock=MASTERCLOCK_STE;
masterprediv=MASTERPREDIV_STE;
switch(cookie_mch>>16) {
/*
case MCH_STE:
masterclock=MASTERCLOCK_STE;
masterprediv=MASTERPREDIV_STE;
break;
*/
case MCH_TT:
masterclock=MASTERCLOCK_TT;
masterprediv=MASTERPREDIV_TT;
break;
case MCH_F30:
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case MCH_ARANYM:
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masterclock=MASTERCLOCK_FALCON1;
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masterprediv=MASTERPREDIV_FALCON;
sfreq=1;
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break;
}
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MINTAUDIO_freqcount=0;
for (i=sfreq;i<4;i++) {
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SDL_MintAudio_AddFrequency(this, masterclock/(masterprediv*(1<<i)),
masterclock, i-sfreq, -1);
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}
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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 int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
{
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]));
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SDL_MintAudio_CheckFpu();
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/* Set replay tracks */
if (cookie_snd & SND_16BIT) {
Settracks(0,0);
Setmontracks(0);
}
Supexec(Mint_InitDma);
/* Set interrupt */
Jdisint(MFP_DMASOUND);
Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_Dma8Interrupt);
Jenabint(MFP_DMASOUND);
if (cookie_snd & SND_16BIT) {
if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) {
DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
}
}
Supexec(Mint_StartReplay);
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return(1); /* We don't use threaded audio */
}
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/* Functions called in supervisor mode */
static void Mint_InitDma(void)
{
unsigned long buffer;
unsigned char mode;
SDL_AudioDevice *this = SDL_MintAudio_device;
Mint_StopReplay();
/* Set buffer */
buffer = (unsigned long) SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
DMAAUDIO_IO.start_high = (buffer>>16) & 255;
DMAAUDIO_IO.start_mid = (buffer>>8) & 255;
DMAAUDIO_IO.start_low = buffer & 255;
buffer += SDL_MintAudio_audiosize;
DMAAUDIO_IO.end_high = (buffer>>16) & 255;
DMAAUDIO_IO.end_mid = (buffer>>8) & 255;
DMAAUDIO_IO.end_low = buffer & 255;
mode = 3-MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
if (this->spec.channels==1) {
mode |= 1<<7;
}
DMAAUDIO_IO.sound_ctrl = mode;
}
static void Mint_StopReplay(void)
{
/* Stop replay */
DMAAUDIO_IO.control=0;
}
static void Mint_StartReplay(void)
{
/* Start replay */
DMAAUDIO_IO.control=3;
}