--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/audio/mint/SDL_mintaudio_dma8.c	Mon Jul 07 19:16:03 2003 +0000
@@ -0,0 +1,354 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga
+
+    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
+*/
+
+/*
+	MiNT audio driver
+	using DMA 8bits (hardware access)
+
+	Patrice Mandin
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+/* Mint includes */
+#include <mint/osbind.h>
+#include <mint/falcon.h>
+#include <mint/cookie.h>
+
+#include "SDL_endian.h"
+#include "SDL_audio.h"
+#include "SDL_audio_c.h"
+#include "SDL_audiomem.h"
+#include "SDL_sysaudio.h"
+
+#include "SDL_atarimxalloc_c.h"
+
+#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: "
+#if 0
+#define DEBUG_PRINT(what) \
+	{ \
+		printf what; \
+	}
+#else
+#define DEBUG_PRINT(what)
+#endif
+
+/*--- Static variables ---*/
+
+static unsigned long cookie_snd, cookie_mch;
+
+/*--- 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)
+{
+	const char *envr = getenv("SDL_AUDIODRIVER");
+
+	/* Check if user asked a different audio driver */
+	if ((envr) && (strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
+		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);
+	}
+
+	if ((cookie_mch>>16)>MCH_F30) {
+		DEBUG_PRINT((DEBUG_NAME "unknown 8 bits audio chip\n"));
+		return 0;
+	}
+
+	/* Check if audio is lockable */
+	if ((cookie_mch>>16) == MCH_F30) {
+		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)
+{
+    free(device->hidden);
+    free(device);
+}
+
+static SDL_AudioDevice *Audio_CreateDevice(int devindex)
+{
+	SDL_AudioDevice *this;
+
+	/* Initialize all variables that we clean on shutdown */
+	this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
+    if ( this ) {
+        memset(this, 0, (sizeof *this));
+        this->hidden = (struct SDL_PrivateAudioData *)
+                malloc((sizeof *this->hidden));
+    }
+    if ( (this == NULL) || (this->hidden == NULL) ) {
+        SDL_OutOfMemory();
+        if ( this ) {
+            free(this);
+        }
+        return(0);
+    }
+    memset(this->hidden, 0, (sizeof *this->hidden));
+
+    /* 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)
+{
+	void *oldpile;
+
+	/* Stop replay */
+	oldpile=(void *)Super(0);
+	DMAAUDIO_IO.control=0;
+	Super(oldpile);
+}
+
+static void Mint_UnlockAudio(_THIS)
+{
+	void *oldpile;
+
+	/* Restart replay */
+	oldpile=(void *)Super(0);
+	DMAAUDIO_IO.control=3;
+	Super(oldpile);
+}
+
+static void Mint_CloseAudio(_THIS)
+{
+	void *oldpile;
+
+	/* Stop replay */
+	oldpile=(void *)Super(0);
+	DMAAUDIO_IO.control=0;
+	Super(oldpile);
+
+	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)
+{
+	int i, masterprediv;
+	unsigned long masterclock;
+
+	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 & 0x8000)!=0)));
+	DEBUG_PRINT(("channels=%d, ", spec->channels));
+	DEBUG_PRINT(("freq=%d\n", spec->freq));
+
+	/* Check formats available */
+	spec->format = AUDIO_S8;
+	
+	/* Calculate and select the closest frequency */
+	MINTAUDIO_nfreq=4;
+	MINTAUDIO_sfreq=0;
+	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:
+			masterclock=MASTERCLOCK_FALCON1;
+			masterprediv=MASTERPREDIV_FALCON<<1;
+			MINTAUDIO_nfreq=3;
+			MINTAUDIO_sfreq=1;
+			break;
+	}
+	for (i=MINTAUDIO_sfreq;i<MINTAUDIO_nfreq;i++) {
+		MINTAUDIO_hardfreq[i]=masterclock/(masterprediv*(1<<i));
+		DEBUG_PRINT((DEBUG_NAME "calc:freq(%d)=%lu\n", i, MINTAUDIO_hardfreq[i]));
+	}
+
+	MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, 0, spec->freq);
+	spec->freq=MINTAUDIO_hardfreq[MINTAUDIO_numfreq];
+
+	DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
+	DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
+	DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x8000)!=0)));
+	DEBUG_PRINT(("channels=%d, ", spec->channels));
+	DEBUG_PRINT(("freq=%d\n", spec->freq));
+
+	return 0;
+}
+
+static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
+{
+	void *oldpile;
+	unsigned long buffer;
+	unsigned char mode;
+	
+	/* Set replay tracks */
+	if (cookie_snd & SND_16BIT) {
+		Settracks(0,0);
+		Setmontracks(0);
+	}
+
+	oldpile=(void *)Super(0);
+
+	/* Stop currently playing sound */
+	DMAAUDIO_IO.control=0;
+
+	/* 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_numfreq;
+	if (spec->channels==1) {
+		mode |= 1<<7;
+	}
+	DMAAUDIO_IO.mode = mode;	
+
+	/* Set interrupt */
+	Jdisint(MFP_DMASOUND);
+	Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_Dma8Interrupt);
+	Jenabint(MFP_DMASOUND);
+
+	/* Go */
+	DMAAUDIO_IO.control = 3;	/* playback + repeat */
+
+	Super(oldpile);
+}
+
+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 */
+	spec->size = spec->samples;
+	spec->size *= spec->channels;
+	spec->size *= (spec->format & 0xFF)/8;
+
+	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;
+	memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
+	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);
+
+    return(1);	/* We don't use threaded audio */
+}