src/audio/mint/SDL_mintaudio_xbios.c
author Patrice Mandin <patmandin@gmail.com>
Mon, 07 Jul 2003 19:16:03 +0000
changeset 644 594422ab8f9f
child 704 c4803992e09c
permissions -rw-r--r--
Atari MiNT: added more audio drivers
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  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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/*
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	MiNT audio driver
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	using XBIOS functions (Falcon)
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	Patrice Mandin
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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/* Mint includes */
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#include <mint/osbind.h>
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#include <mint/falcon.h>
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#include <mint/cookie.h>
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#include "SDL_endian.h"
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#include "SDL_audio.h"
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#include "SDL_audio_c.h"
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#include "SDL_audiomem.h"
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#include "SDL_sysaudio.h"
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#include "SDL_atarimxalloc_c.h"
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#include "SDL_mintaudio.h"
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/*--- Defines ---*/
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#define MINT_AUDIO_DRIVER_NAME "mint_xbios"
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/* Debug print info */
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#define DEBUG_NAME "audio:xbios: "
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#if 0
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#define DEBUG_PRINT(what) \
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	{ \
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		printf what; \
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	}
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#else
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#define DEBUG_PRINT(what)
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#endif
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/*--- Static variables ---*/
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static unsigned long cookie_snd;
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/*--- Audio driver functions ---*/
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static void Mint_CloseAudio(_THIS);
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static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
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static void Mint_LockAudio(_THIS);
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static void Mint_UnlockAudio(_THIS);
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/* To check/init hardware audio */
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static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
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static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
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/*--- Audio driver bootstrap functions ---*/
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static int Audio_Available(void)
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{
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	const char *envr = getenv("SDL_AUDIODRIVER");
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	/* Check if user asked a different audio driver */
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	if ((envr) && (strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
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		DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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		return(0);
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	}
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	/* Cookie _SND present ? if not, assume ST machine */
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	if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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		cookie_snd = SND_PSG;
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	}
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	/* Check if we have 16 bits audio */
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	if ((cookie_snd & SND_16BIT)==0) {
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		DEBUG_PRINT((DEBUG_NAME "no 16 bits sound\n"));
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	    return(0);
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	}
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	/* Check if audio is lockable */
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	if (Locksnd()!=1) {
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		DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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		return(0);
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	}
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	Unlocksnd();
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	DEBUG_PRINT((DEBUG_NAME "XBIOS audio available!\n"));
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	return(1);
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}
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static void Audio_DeleteDevice(SDL_AudioDevice *device)
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{
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    free(device->hidden);
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    free(device);
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}
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static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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{
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	SDL_AudioDevice *this;
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	/* Initialize all variables that we clean on shutdown */
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	this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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    if ( this ) {
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        memset(this, 0, (sizeof *this));
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        this->hidden = (struct SDL_PrivateAudioData *)
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                malloc((sizeof *this->hidden));
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    }
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    if ( (this == NULL) || (this->hidden == NULL) ) {
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        SDL_OutOfMemory();
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        if ( this ) {
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            free(this);
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        }
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        return(0);
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    }
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    memset(this->hidden, 0, (sizeof *this->hidden));
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    /* Set the function pointers */
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    this->OpenAudio   = Mint_OpenAudio;
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    this->CloseAudio  = Mint_CloseAudio;
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    this->LockAudio   = Mint_LockAudio;
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    this->UnlockAudio = Mint_UnlockAudio;
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    this->free        = Audio_DeleteDevice;
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    return this;
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}
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AudioBootStrap MINTAUDIO_XBIOS_bootstrap = {
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	MINT_AUDIO_DRIVER_NAME, "MiNT XBIOS audio driver",
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	Audio_Available, Audio_CreateDevice
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};
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static void Mint_LockAudio(_THIS)
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{
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	/* Stop replay */
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	Buffoper(0);
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}
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static void Mint_UnlockAudio(_THIS)
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{
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	/* Restart replay */
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	Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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}
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static void Mint_CloseAudio(_THIS)
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{
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	/* Stop replay */
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	Buffoper(0);
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	/* Uninstall interrupt */
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	Jdisint(MFP_DMASOUND);
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	/* Wait if currently playing sound */
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	while (SDL_MintAudio_mutex != 0) {
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	}
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	/* Clear buffers */
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	if (SDL_MintAudio_audiobuf[0]) {
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		Mfree(SDL_MintAudio_audiobuf[0]);
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		SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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	}
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	/* Unlock sound system */
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	Unlocksnd();
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}
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static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
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{
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	int i;
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	DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
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	DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
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	DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x8000)!=0)));
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	DEBUG_PRINT(("channels=%d, ", spec->channels));
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	DEBUG_PRINT(("freq=%d\n", spec->freq));
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	spec->format |= 0x8000;	/* Audio is always signed */
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	if ((spec->format & 0x00ff)==16) {
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		spec->format |= 0x1000;	/* Audio is always big endian */
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		spec->channels=2;	/* 16 bits always stereo */
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	}
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	/* FIXME: check for an external clock */
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	MINTAUDIO_sfreq=1;
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	MINTAUDIO_nfreq=12;
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	for (i=MINTAUDIO_sfreq;i<MINTAUDIO_nfreq;i++) {
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		MINTAUDIO_hardfreq[i]=MASTERCLOCK_FALCON1/(MASTERPREDIV_FALCON*(i+1));
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		DEBUG_PRINT((DEBUG_NAME "calc:freq(%d)=%lu\n", i, MINTAUDIO_hardfreq[i]));
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	}
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	MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, 1, spec->freq);
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	spec->freq=MINTAUDIO_hardfreq[MINTAUDIO_numfreq];
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	DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
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	DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
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	DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x8000)!=0)));
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	DEBUG_PRINT(("channels=%d, ", spec->channels));
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	DEBUG_PRINT(("freq=%d\n", spec->freq));
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	return 0;
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}
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static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
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{
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	int channels_mode;
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	void *buffer;
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	/* Stop currently playing sound */
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	Buffoper(0);
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	/* Set replay tracks */
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	Settracks(0,0);
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	Setmontracks(0);
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	/* Select replay format */
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	channels_mode=STEREO16;
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	switch (spec->format & 0xff) {
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		case 8:
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			if (spec->channels==2) {
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				channels_mode=STEREO8;
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			} else {
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				channels_mode=MONO8;
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			}
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			break;
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	}
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	if (Setmode(channels_mode)<0) {
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		DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
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	}
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	/* FIXME: select an external clock */
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	Devconnect(DMAPLAY, DAC, CLK25M, MINTAUDIO_numfreq, 1);
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	DEBUG_PRINT((DEBUG_NAME "25.175 MHz clock selected, prescaler %d\n", MINTAUDIO_numfreq));
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	/* Set buffer */
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	buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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	if (Setbuffer(0, buffer, buffer + spec->size)<0) {
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		DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));
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	}
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	/* Install interrupt */
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	Jdisint(MFP_DMASOUND);
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	Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_XbiosInterrupt);
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	Jenabint(MFP_DMASOUND);
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	if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) {
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		DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
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	}
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	/* Go */
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	Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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	DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
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}
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static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
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{
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	/* Lock sound system */
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	if (Locksnd()!=1) {
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   	    SDL_SetError("Mint_OpenAudio: Audio system already in use");
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        return(-1);
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	}
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	SDL_MintAudio_device = this;
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	/* Check audio capabilities */
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	if (Mint_CheckAudio(this, spec)==-1) {
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		return -1;
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	}
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	SDL_CalculateAudioSpec(spec);
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	/* Allocate memory for audio buffers in DMA-able RAM */
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	spec->size = spec->samples;
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	spec->size *= spec->channels;
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	spec->size *= (spec->format & 0xFF)/8;
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	DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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	SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
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	if (SDL_MintAudio_audiobuf[0]==NULL) {
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		SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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		return (-1);
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	}
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	SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
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	SDL_MintAudio_numbuf=0;
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	memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
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	SDL_MintAudio_audiosize = spec->size;
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	SDL_MintAudio_mutex = 0;
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	DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
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	DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
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	/* Setup audio hardware */
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	Mint_InitAudio(this, spec);
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    return(1);	/* We don't use threaded audio */
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}