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SDL_mintaudio_gsxb.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 XBIOS functions (GSXB compatible driver)
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 "SDL_mintaudio.h"
#include "SDL_mintaudio_gsxb.h"
/*--- Defines ---*/
#define MINT_AUDIO_DRIVER_NAME "mint_gsxb"
/* Debug print info */
#define DEBUG_NAME "audio:gsxb: "
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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_gsxb;
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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);
static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
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static void Mint_SwapBuffers(Uint8 *nextbuf, int nextsize);
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/* GSXB callbacks */
static void Mint_GsxbInterrupt(void);
static void Mint_GsxbNullInterrupt(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 _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 GSXB present ? */
cookie_gsxb = (Getcookie(C_GSXB, &cookie_gsxb) == C_FOUND);
/* Is it GSXB ? */
if (((cookie_snd & SND_GSXB)==0) || (cookie_gsxb==0)) {
DEBUG_PRINT((DEBUG_NAME "no GSXB audio\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 "GSXB 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_GSXB_bootstrap = {
MINT_AUDIO_DRIVER_NAME, "MiNT GSXB 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 */
Buffoper(0);
/* Uninstall interrupt */
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if (NSetinterrupt(2, SI_NONE, Mint_GsxbNullInterrupt)<0) {
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DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed in close\n"));
}
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SDL_MintAudio_FreeBuffers();
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/* Unlock sound system */
Unlocksnd();
}
static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
{
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long snd_format = 0;
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int i, /*resolution,*/ format_signed, format_bigendian;
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Uint16 test_format = SDL_FirstAudioFormat(spec->format);
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int valid_datatype = 0;
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/*resolution = spec->format & 0x00ff;*/
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format_signed = ((spec->format & 0x8000)!=0);
format_bigendian = ((spec->format & 0x1000)!=0);
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DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
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; /* no more than stereo! */
}
while ((!valid_datatype) && (test_format)) {
/* Check formats available */
snd_format = Sndstatus(SND_QUERYFORMATS);
spec->format = test_format;
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/*resolution = spec->format & 0xff;*/
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format_signed = (spec->format & (1<<15));
format_bigendian = (spec->format & (1<<12));
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switch (test_format) {
case AUDIO_U8:
case AUDIO_S8:
if (snd_format & SND_FORMAT8) {
valid_datatype = 1;
snd_format = Sndstatus(SND_QUERY8BIT);
}
break;
case AUDIO_U16LSB:
case AUDIO_S16LSB:
case AUDIO_U16MSB:
case AUDIO_S16MSB:
if (snd_format & SND_FORMAT16) {
valid_datatype = 1;
snd_format = Sndstatus(SND_QUERY16BIT);
}
break;
default:
test_format = SDL_NextAudioFormat();
break;
}
}
if (!valid_datatype) {
SDL_SetError("Unsupported audio format");
return (-1);
}
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/* Check signed/unsigned format */
if (format_signed) {
if (snd_format & SND_FORMATSIGNED) {
/* Ok */
} else if (snd_format & SND_FORMATUNSIGNED) {
/* Give unsigned format */
spec->format = spec->format & (~0x8000);
}
} else {
if (snd_format & SND_FORMATUNSIGNED) {
/* Ok */
} else if (snd_format & SND_FORMATSIGNED) {
/* Give signed format */
spec->format |= 0x8000;
}
}
if (format_bigendian) {
if (snd_format & SND_FORMATBIGENDIAN) {
/* Ok */
} else if (snd_format & SND_FORMATLITTLEENDIAN) {
/* Give little endian format */
spec->format = spec->format & (~0x1000);
}
} else {
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if (snd_format & SND_FORMATLITTLEENDIAN) {
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/* Ok */
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} else if (snd_format & SND_FORMATBIGENDIAN) {
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/* Give big endian format */
spec->format |= 0x1000;
}
}
/* Calculate and select the closest frequency */
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MINTAUDIO_freqcount=0;
for (i=1;i<4;i++) {
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SDL_MintAudio_AddFrequency(this,
MASTERCLOCK_44K/(MASTERPREDIV_MILAN*(1<<i)), MASTERCLOCK_44K,
(1<<i)-1, -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 void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
{
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int channels_mode, prediv;
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/* Stop currently playing sound */
Buffoper(0);
/* Set replay tracks */
Settracks(0,0);
Setmontracks(0);
/* Select replay format */
switch (spec->format & 0xff) {
case 8:
if (spec->channels==2) {
channels_mode=STEREO8;
} else {
channels_mode=MONO8;
}
break;
case 16:
if (spec->channels==2) {
channels_mode=STEREO16;
} else {
channels_mode=MONO16;
}
break;
default:
channels_mode=STEREO16;
break;
}
if (Setmode(channels_mode)<0) {
DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
}
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prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
Devconnect(DMAPLAY, DAC, CLKEXT, prediv, 1);
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/* Set buffer */
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Mint_SwapBuffers(MINTAUDIO_audiobuf[0], MINTAUDIO_audiosize);
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/* Install interrupt */
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if (NSetinterrupt(2, SI_PLAY, Mint_GsxbInterrupt)<0) {
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DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed\n"));
}
/* 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;
}
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if (!SDL_MintAudio_InitBuffers(spec)) {
return -1;
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}
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/* Setup audio hardware */
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MINTAUDIO_swapbuf = Mint_SwapBuffers;
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Mint_InitAudio(this, spec);
return(1); /* We don't use threaded audio */
}
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static void Mint_SwapBuffers(Uint8 *nextbuf, int nextsize)
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{
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unsigned long buffer = (unsigned long) nextbuf;
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Setbuffer(0, buffer, buffer + nextsize);
}
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static void Mint_GsxbInterrupt(void)
{
++SDL_MintAudio_num_its;
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}
static void Mint_GsxbNullInterrupt(void)
{
}