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changeset 961:185acc07127a

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Date: Fri, 29 Oct 2004 11:47:09 +0200 From: Patrice Mandin Subject: Reworked audio drivers for Atari platform These are reworked audio drivers for the Atari platform. Previous drivers were missing some features: - Test external clock plugged to DSP port on Atari Falcon 030. - Ability to select internal or external clock. So now, I generate a list of frequencies available, with the master clock and predivisor to use. One big caveat to this: I do not have an external clock, so I hope it works.
author Patrice Mandin <patmandin@gmail.com>
date Fri, 29 Oct 2004 09:56:53 +0000
parents eec28a5278be
children 176240cf4405
files src/audio/mint/SDL_mintaudio.c src/audio/mint/SDL_mintaudio.h src/audio/mint/SDL_mintaudio_dma8.c src/audio/mint/SDL_mintaudio_dma8.h src/audio/mint/SDL_mintaudio_gsxb.c src/audio/mint/SDL_mintaudio_it.S src/audio/mint/SDL_mintaudio_mcsn.c src/audio/mint/SDL_mintaudio_stfa.c src/audio/mint/SDL_mintaudio_xbios.c
diffstat 9 files changed, 373 insertions(+), 110 deletions(-) [+]
line wrap: on
line diff
--- a/src/audio/mint/SDL_mintaudio.c	Sat Oct 09 22:11:45 2004 +0000
+++ b/src/audio/mint/SDL_mintaudio.c	Fri Oct 29 09:56:53 2004 +0000
@@ -41,6 +41,7 @@
 unsigned long SDL_MintAudio_audiosize;		/* Length of audio buffer=spec->size */
 unsigned short SDL_MintAudio_numbuf;		/* Buffer to play */
 unsigned short SDL_MintAudio_mutex;
+unsigned long SDL_MintAudio_clocktics;
 cookie_stfa_t	*SDL_MintAudio_stfa;
 
 /* The callback function, called by each driver whenever needed */
@@ -64,30 +65,57 @@
 	}
 }
 
-/* Simple function to search for the nearest frequency */
-int SDL_MintAudio_SearchFrequency(_THIS, int falcon_codec, int desired_freq)
+/* Add a new frequency/clock/predivisor to the current list */
+void SDL_MintAudio_AddFrequency(_THIS, Uint32 frequency, Uint32 clock, Uint32 prediv)
+{
+	int i, p;
+
+	if (MINTAUDIO_freqcount==MINTAUDIO_maxfreqs) {
+		return;
+	}
+
+	/* Search where to insert the frequency (highest first) */
+	for (p=0; p<MINTAUDIO_freqcount; p++) {
+		if (frequency > MINTAUDIO_frequencies[p].frequency) {
+			break;
+		}
+	}
+
+	/* Put all following ones farer */
+	if (MINTAUDIO_freqcount>0) {
+		for (i=MINTAUDIO_freqcount; i>p; i--) {
+			MINTAUDIO_frequencies[i].frequency = MINTAUDIO_frequencies[i-1].frequency;
+			MINTAUDIO_frequencies[i].masterclock = MINTAUDIO_frequencies[i-1].masterclock;
+			MINTAUDIO_frequencies[i].predivisor = MINTAUDIO_frequencies[i-1].predivisor;
+		}
+	}
+
+	/* And insert new one */
+	MINTAUDIO_frequencies[p].frequency = frequency;
+	MINTAUDIO_frequencies[p].masterclock = clock;
+	MINTAUDIO_frequencies[p].predivisor = prediv;
+
+	MINTAUDIO_freqcount++;
+}
+
+/* Search for the nearest frequency */
+int SDL_MintAudio_SearchFrequency(_THIS, int desired_freq)
 {
 	int i;
 
 	/* Only 1 freq ? */
-	if (MINTAUDIO_nfreq==1) {
-		return(MINTAUDIO_sfreq);
+	if (MINTAUDIO_freqcount==1) {
+		return 0;
 	}
 
 	/* Check the array */
-	for (i=MINTAUDIO_sfreq; i<MINTAUDIO_nfreq-1; i++) {
-		/* Remove unusable falcon codec frequencies */
-		if (falcon_codec) {
-			if ((i==6) || (i==8) || (i==10)) {
-				continue;
-			}
-		}
-
-		if (desired_freq >= ((MINTAUDIO_hardfreq[i]+MINTAUDIO_hardfreq[i+1])>>1)) {
+	for (i=0; i<MINTAUDIO_freqcount; i++) {
+		if (desired_freq >= ((MINTAUDIO_frequencies[i].frequency+
+			MINTAUDIO_frequencies[i+1].frequency)>>1)) {
 			return i;
 		}
 	}
 
 	/* Not in the array, give the latest */
-	return MINTAUDIO_nfreq-1;
+	return MINTAUDIO_freqcount-1;
 }
--- a/src/audio/mint/SDL_mintaudio.h	Sat Oct 09 22:11:45 2004 +0000
+++ b/src/audio/mint/SDL_mintaudio.h	Fri Oct 29 09:56:53 2004 +0000
@@ -35,17 +35,25 @@
 /* Hidden "this" pointer for the audio functions */
 #define _THIS	SDL_AudioDevice *this
 
+/* 16 predivisors with 3 clocks max. */
+#define MINTAUDIO_maxfreqs		(16*3)		
+
+typedef struct {
+	Uint32	frequency;
+	Uint32	masterclock;
+	Uint32	predivisor;
+} mint_frequency_t;
+
 struct SDL_PrivateAudioData {
-	Uint32	hardfreq[16];	/* Array of replay freqs of the hardware */
-	int		sfreq;			/* First number of freq to use in the array */
-	int 	nfreq;			/* Number of freqs to use in the array */
+	mint_frequency_t	frequencies[MINTAUDIO_maxfreqs];
+	int 	freq_count;		/* Number of frequencies in the array */
 	int		numfreq;		/* Number of selected frequency */
 };
 
 /* Old variable names */
-#define MINTAUDIO_hardfreq		(this->hidden->hardfreq)
-#define MINTAUDIO_sfreq			(this->hidden->sfreq)
-#define MINTAUDIO_nfreq			(this->hidden->nfreq)
+
+#define MINTAUDIO_frequencies	(this->hidden->frequencies)
+#define MINTAUDIO_freqcount		(this->hidden->freq_count)
 #define MINTAUDIO_numfreq		(this->hidden->numfreq)
 
 /* _MCH cookie (values>>16) */
@@ -110,14 +118,17 @@
 extern unsigned short SDL_MintAudio_numbuf;		/* Buffer to play */
 extern unsigned short SDL_MintAudio_mutex;
 extern cookie_stfa_t *SDL_MintAudio_stfa;
+extern unsigned long SDL_MintAudio_clocktics;
 
 /* Functions */
 void SDL_MintAudio_Callback(void);
-int SDL_MintAudio_SearchFrequency(_THIS, int falcon_codec, int desired_freq);
+void SDL_MintAudio_AddFrequency(_THIS, Uint32 frequency, Uint32 clock, Uint32 prediv);
+int SDL_MintAudio_SearchFrequency(_THIS, int desired_freq);
 
 /* ASM interrupt functions */
 void SDL_MintAudio_GsxbInterrupt(void);
 void SDL_MintAudio_EmptyGsxbInterrupt(void);
+void SDL_MintAudio_XbiosInterruptMeasureClock(void);
 void SDL_MintAudio_XbiosInterrupt(void);
 void SDL_MintAudio_Dma8Interrupt(void);
 void SDL_MintAudio_StfaInterrupt(void);
--- a/src/audio/mint/SDL_mintaudio_dma8.c	Sat Oct 09 22:11:45 2004 +0000
+++ b/src/audio/mint/SDL_mintaudio_dma8.c	Fri Oct 29 09:56:53 2004 +0000
@@ -53,7 +53,7 @@
 
 /* Debug print info */
 #define DEBUG_NAME "audio:dma8: "
-#if 0
+#if 1
 #define DEBUG_PRINT(what) \
 	{ \
 		printf what; \
@@ -100,11 +100,12 @@
 	}
 
 	/* 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;
@@ -218,7 +219,7 @@
 
 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
 {
-	int i, masterprediv;
+	int i, masterprediv, sfreq;
 	unsigned long masterclock;
 
 	DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
@@ -231,8 +232,7 @@
 	spec->format = AUDIO_S8;
 	
 	/* Calculate and select the closest frequency */
-	MINTAUDIO_nfreq=4;
-	MINTAUDIO_sfreq=0;
+	sfreq=0;
 	masterclock=MASTERCLOCK_STE;
 	masterprediv=MASTERPREDIV_STE;
 	switch(cookie_mch>>16) {
@@ -248,18 +248,27 @@
 			break;
 		case MCH_F30:
 			masterclock=MASTERCLOCK_FALCON1;
-			masterprediv=MASTERPREDIV_FALCON<<1;
-			MINTAUDIO_nfreq=3;
-			MINTAUDIO_sfreq=1;
+			masterprediv=MASTERPREDIV_FALCON;
+			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_freqcount=0;
+	for (i=sfreq;i<4;i++) {
+		SDL_MintAudio_AddFrequency(this, masterclock/(masterprediv*(1<<i)), masterclock, i-sfreq);
 	}
 
-	MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, 0, spec->freq);
-	spec->freq=MINTAUDIO_hardfreq[MINTAUDIO_numfreq];
+#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;
 
 	DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
 	DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
@@ -298,11 +307,11 @@
 	DMAAUDIO_IO.end_mid = (buffer>>8) & 255;
 	DMAAUDIO_IO.end_low = buffer & 255;
 
-	mode = 3-MINTAUDIO_numfreq;
+	mode = 3-MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
 	if (spec->channels==1) {
 		mode |= 1<<7;
 	}
-	DMAAUDIO_IO.mode = mode;	
+	DMAAUDIO_IO.sound_ctrl = mode;	
 
 	/* Set interrupt */
 	Jdisint(MFP_DMASOUND);
--- a/src/audio/mint/SDL_mintaudio_dma8.h	Sat Oct 09 22:11:45 2004 +0000
+++ b/src/audio/mint/SDL_mintaudio_dma8.h	Fri Oct 29 09:56:53 2004 +0000
@@ -21,9 +21,9 @@
 */
 
 /*
-	DMA 8bits audio definitions
+	DMA 8bits and Falcon Codec audio definitions
 
-	Patrice Mandin
+	Patrice Mandin, Didier Méquignon
 */
 
 #ifndef _SDL_mintaudio_dma8_h
@@ -57,8 +57,27 @@
 
 	unsigned char dummy10[12];
 
-	unsigned char track_select; /* CODEC only */
-	unsigned char mode;
+	unsigned char track_ctrl; /* CODEC only */
+	unsigned char sound_ctrl;
+	unsigned short sound_data;
+	unsigned short sound_mask;
+
+	unsigned char dummy11[10];
+	
+	unsigned short dev_ctrl;
+	unsigned short dest_ctrl;
+	unsigned short sync_div;
+	unsigned char track_rec;
+	unsigned char adderin_input;
+	unsigned char channel_input;
+	unsigned char channel_amplification;
+	unsigned char channel_reduction;
+	
+	unsigned char dummy12[6];
+
+	unsigned char data_direction;
+	unsigned char dummy13;
+	unsigned char dev_data;
 };
 #define DMAAUDIO_IO ((*(volatile struct DMAAUDIO_IO_S *)DMAAUDIO_IO_BASE))
 
--- a/src/audio/mint/SDL_mintaudio_gsxb.c	Sat Oct 09 22:11:45 2004 +0000
+++ b/src/audio/mint/SDL_mintaudio_gsxb.c	Fri Oct 29 09:56:53 2004 +0000
@@ -53,7 +53,7 @@
 
 /* Debug print info */
 #define DEBUG_NAME "audio:gsxb: "
-#if 0
+#if 1
 #define DEBUG_PRINT(what) \
 	{ \
 		printf what; \
@@ -179,29 +179,21 @@
 	/* Stop replay */
 	Buffoper(0);
 
-	DEBUG_PRINT((DEBUG_NAME "closeaudio: replay stopped\n"));
-
 	/* Uninstall interrupt */
 	if (NSetinterrupt(2, SI_NONE, SDL_MintAudio_EmptyGsxbInterrupt)<0) {
 		DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed in close\n"));
 	}
 
-	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"));
-
 	/* Unlock sound system */
 	Unlocksnd();
 }
@@ -278,15 +270,22 @@
 	}
 	
 	/* Calculate and select the closest frequency */
-	MINTAUDIO_sfreq=1;
-	MINTAUDIO_nfreq=12;
-	for (i=MINTAUDIO_sfreq;i<MINTAUDIO_nfreq;i++) {
-		MINTAUDIO_hardfreq[i]=MASTERCLOCK_44K/(MASTERPREDIV_MILAN*(i+1));
-		DEBUG_PRINT((DEBUG_NAME "calc:freq(%d)=%lu\n", i, MINTAUDIO_hardfreq[i]));
+	MINTAUDIO_freqcount=0;
+	for (i=1;i<4;i++) {
+		SDL_MintAudio_AddFrequency(this, MASTERCLOCK_44K/(MASTERPREDIV_MILAN*(1<<i)), MASTERCLOCK_44K, (1<<i)-1);
 	}
 
-	MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, 1, spec->freq);
-	spec->freq=MINTAUDIO_hardfreq[MINTAUDIO_numfreq];
+#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;
 
 	DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
 	DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
@@ -299,7 +298,7 @@
 
 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
 {
-	int channels_mode;
+	int channels_mode, prediv;
 	void *buffer;
 
 	/* Stop currently playing sound */
@@ -333,7 +332,8 @@
 		DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
 	}
 
-	Devconnect(DMAPLAY, DAC, CLKEXT, MINTAUDIO_numfreq, 1);
+	prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
+	Devconnect(DMAPLAY, DAC, CLKEXT, prediv, 1);
 
 	/* Set buffer */
 	buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
--- a/src/audio/mint/SDL_mintaudio_it.S	Sat Oct 09 22:11:45 2004 +0000
+++ b/src/audio/mint/SDL_mintaudio_it.S	Fri Oct 29 09:56:53 2004 +0000
@@ -23,7 +23,7 @@
 /*
 	Audio interrupts
 
-	Patrice Mandin
+	Patrice Mandin, Didier Méquignon
  */
 
 	.text
@@ -33,6 +33,7 @@
 	.globl	_SDL_MintAudio_GsxbInterrupt
 	.globl	_SDL_MintAudio_EmptyGsxbInterrupt
 	.globl	_SDL_MintAudio_XbiosInterrupt
+	.globl	_SDL_MintAudio_XbiosInterruptMeasureClock
 	.globl	_SDL_MintAudio_Dma8Interrupt
 	.globl	_SDL_MintAudio_StfaInterrupt
 
@@ -40,6 +41,7 @@
 	.globl	_SDL_MintAudio_audiobuf
 	.globl	_SDL_MintAudio_numbuf
 	.globl	_SDL_MintAudio_audiosize
+	.globl	_SDL_MintAudio_clocktics
 
 	.globl	_SDL_MintAudio_stfa
 
@@ -94,6 +96,17 @@
 _SDL_MintAudio_EmptyGsxbInterrupt:
 	rts
 
+/*--- Xbios interrupt vector to measure Falcon external clock ---*/
+
+_SDL_MintAudio_XbiosInterruptMeasureClock:          /* 1 mS */
+
+	btst	#0,0xFFFF8901:w	/* state DMA sound */
+	beqs	SDL_MintAudio_EndIntMeasure
+	addql	#1,_SDL_MintAudio_clocktics
+SDL_MintAudio_EndIntMeasure:
+	bclr	#5,0xFFFFFA0F:w	/* Clear service bit */
+	rte
+
 /*--- Xbios interrupt vector ---*/
 
 _SDL_MintAudio_XbiosInterrupt:
--- a/src/audio/mint/SDL_mintaudio_mcsn.c	Sat Oct 09 22:11:45 2004 +0000
+++ b/src/audio/mint/SDL_mintaudio_mcsn.c	Fri Oct 29 09:56:53 2004 +0000
@@ -53,7 +53,7 @@
 
 /* Debug print info */
 #define DEBUG_NAME "audio:mcsn: "
-#if 0
+#if 1
 #define DEBUG_PRINT(what) \
 	{ \
 		printf what; \
@@ -217,14 +217,12 @@
 	DEBUG_PRINT(("freq=%d\n", spec->freq));
 
 	/* Check formats available */
-	MINTAUDIO_nfreq=4;
-	MINTAUDIO_sfreq=0;
+	MINTAUDIO_freqcount=0;
 	switch(cookie_mcsn->play) {
 		case MCSN_ST:
 			spec->channels=1;
 			spec->format=8; /* FIXME: is it signed or unsigned ? */
-			MINTAUDIO_nfreq=1;
-			MINTAUDIO_hardfreq[0]=12500;
+			SDL_MintAudio_AddFrequency(this, 12500, 0, 0);
 			break;
 		case MCSN_TT:	/* Also STE, Mega STE */
 			spec->format=AUDIO_S8;
@@ -234,21 +232,22 @@
 				masterclock=MASTERCLOCK_TT;
 				masterprediv=MASTERPREDIV_TT;
 			}
-			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]));
+			for (i=0; i<4; i++) {
+				SDL_MintAudio_AddFrequency(this, masterclock/(masterprediv*(1<<i)), masterclock, 3-i);
 			}
 			break;
 		case MCSN_FALCON:	/* Also Mac */
-			MINTAUDIO_nfreq=12;
-			MINTAUDIO_sfreq=1;
-			masterclock=MASTERCLOCK_FALCON1;
+			for (i=1; i<12; i++) {
+				/* Remove unusable Falcon codec predivisors */
+				if ((i==6) || (i==8) || (i==10)) {
+					continue;
+				}
+				SDL_MintAudio_AddFrequency(this, MASTERCLOCK_FALCON1/(MASTERPREDIV_FALCON*(i+1)), CLK25M, i+1);
+			}
 			if (cookie_mcsn->res1 != 0) {
-				masterclock=cookie_mcsn->res1;
-			}
-			for (i=MINTAUDIO_sfreq;i<MINTAUDIO_nfreq;i++) {
-				MINTAUDIO_hardfreq[i]=masterclock/(MASTERPREDIV_FALCON*(i+1));
-				DEBUG_PRINT((DEBUG_NAME "calc:freq(%d)=%lu\n", i, MINTAUDIO_hardfreq[i]));
+				for (i=1; i<4; i++) {
+					SDL_MintAudio_AddFrequency(this, (cookie_mcsn->res1)/(MASTERPREDIV_FALCON*(1<<i)), CLKEXT, (1<<i)-1);
+				}
 			}
 			spec->format |= 0x8000;	/* Audio is always signed */
 			if ((spec->format & 0x00ff)==16) {
@@ -258,8 +257,17 @@
 			break;
 	}
 
-	MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, (cookie_mch>>16)==MCH_F30, spec->freq);
-	spec->freq=MINTAUDIO_hardfreq[MINTAUDIO_numfreq];
+#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;
 
 	DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
 	DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
@@ -272,7 +280,7 @@
 
 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
 {
-	int channels_mode;
+	int channels_mode, prediv, dmaclock;
 	void *buffer;
 
 	/* Stop currently playing sound */
@@ -297,20 +305,17 @@
 		DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
 	}
 
+	dmaclock = MINTAUDIO_frequencies[MINTAUDIO_numfreq].masterclock;
+	prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
 	switch(cookie_mcsn->play) {
 		case MCSN_TT:
 			Devconnect(DMAPLAY, DAC, CLK25M, CLKOLD, 1);
-			Soundcmd(SETPRESCALE, 3-MINTAUDIO_numfreq);
+			Soundcmd(SETPRESCALE, prediv);
 			DEBUG_PRINT((DEBUG_NAME "STE/TT prescaler selected\n"));
 			break;
 		case MCSN_FALCON:
-			if (cookie_mcsn->res1 != 0) {
-				Devconnect(DMAPLAY, DAC, CLKEXT, MINTAUDIO_numfreq, 1);
-				DEBUG_PRINT((DEBUG_NAME "External clock selected, prescaler %d\n", MINTAUDIO_numfreq));
-			} else {
-				Devconnect(DMAPLAY, DAC, CLK25M, MINTAUDIO_numfreq, 1);
-				DEBUG_PRINT((DEBUG_NAME "25.175 MHz clock selected, prescaler %d\n", MINTAUDIO_numfreq));
-			}
+			Devconnect(DMAPLAY, DAC, dmaclock, prediv, 1);
+			DEBUG_PRINT((DEBUG_NAME "Falcon prescaler selected\n"));
 			break;
 	}
 
--- a/src/audio/mint/SDL_mintaudio_stfa.c	Sat Oct 09 22:11:45 2004 +0000
+++ b/src/audio/mint/SDL_mintaudio_stfa.c	Fri Oct 29 09:56:53 2004 +0000
@@ -53,7 +53,7 @@
 
 /* Debug print info */
 #define DEBUG_NAME "audio:stfa: "
-#if 0
+#if 1
 #define DEBUG_PRINT(what) \
 	{ \
 		printf what; \
@@ -211,15 +211,22 @@
 	DEBUG_PRINT(("freq=%d\n", spec->freq));
 
 	/* Check formats available */
-	MINTAUDIO_nfreq=16;
-	MINTAUDIO_sfreq=0;
-	for (i=MINTAUDIO_sfreq;i<MINTAUDIO_nfreq;i++) {
-		MINTAUDIO_hardfreq[i]=freqs[15-i];
-		DEBUG_PRINT((DEBUG_NAME "calc:freq(%d)=%lu\n", i, MINTAUDIO_hardfreq[i]));
+	MINTAUDIO_freqcount=0;
+	for (i=0;i<16;i++) {
+		SDL_MintAudio_AddFrequency(this, freqs[i], 0, i);
 	}
 
-	MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, 0, spec->freq);
-	spec->freq=MINTAUDIO_hardfreq[MINTAUDIO_numfreq];
+#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;
 
 	DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
 	DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
@@ -243,7 +250,7 @@
 	cookie_stfa->sound_enable=STFA_PLAY_DISABLE;
 
 	/* Select replay format */
-	cookie_stfa->sound_control = 15-MINTAUDIO_numfreq;
+	cookie_stfa->sound_control = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
 	if ((spec->format & 0xff)==8) {
 		cookie_stfa->sound_control |= STFA_FORMAT_8BIT;
 	} else {
--- a/src/audio/mint/SDL_mintaudio_xbios.c	Sat Oct 09 22:11:45 2004 +0000
+++ b/src/audio/mint/SDL_mintaudio_xbios.c	Fri Oct 29 09:56:53 2004 +0000
@@ -24,12 +24,13 @@
 	MiNT audio driver
 	using XBIOS functions (Falcon)
 
-	Patrice Mandin
+	Patrice Mandin, Didier Méquignon
 */
 
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <unistd.h>
 
 /* Mint includes */
 #include <mint/osbind.h>
@@ -45,6 +46,7 @@
 #include "SDL_atarimxalloc_c.h"
 
 #include "SDL_mintaudio.h"
+#include "SDL_mintaudio_dma8.h"
 
 /*--- Defines ---*/
 
@@ -52,7 +54,7 @@
 
 /* Debug print info */
 #define DEBUG_NAME "audio:xbios: "
-#if 0
+#if 1
 #define DEBUG_PRINT(what) \
 	{ \
 		printf what; \
@@ -186,9 +188,150 @@
 	Unlocksnd();
 }
 
+/* Falcon XBIOS implementation of Devconnect() is buggy with external clock */
+static void Devconnect2(int src, int dst, int sclk, int pre)
+{		
+	static const unsigned short MASK1[3] = { 0, 0x6000, 0 };
+	static const unsigned short MASK2[4] = { 0xFFF0, 0xFF8F, 0xF0FF, 0x0FFF };
+	static const unsigned short INDEX1[4] = {  1, 3, 5, 7 };
+	static const unsigned short INDEX2[4] = {  0, 2, 4, 6 };
+	unsigned short sync_div,dev_ctrl,dest_ctrl;
+	void *oldstack;
+
+	if (dst==0) {
+		return;
+	}
+
+	oldstack=(void *)Super(0);
+
+	dev_ctrl = DMAAUDIO_IO.dev_ctrl;
+	dest_ctrl = DMAAUDIO_IO.dest_ctrl;
+	dev_ctrl &= MASK2[src];
+
+	if (src==ADC) {
+		dev_ctrl |= MASK1[sclk];
+	} else {
+		dev_ctrl |= (INDEX1[sclk] << (src<<4));
+	}
+
+	if (dst & DMAREC) {		
+		dest_ctrl &= 0xFFF0;
+		dest_ctrl |= INDEX1[src];
+	}
+
+	if (dst & DSPRECV) {		
+		dest_ctrl &= 0xFF8F;
+		dest_ctrl |= (INDEX1[src]<<4); 
+	}
+
+	if (dst & EXTOUT) {		
+		dest_ctrl &= 0xF0FF;
+		dest_ctrl |= (INDEX1[src]<<8); 
+	}
+
+	if (dst & DAC) {		
+		dev_ctrl &= 0x0FFF;
+		dev_ctrl |= MASK1[sclk]; 
+		dest_ctrl &=  0x0FFF;
+		dest_ctrl |= (INDEX2[src]<<12); 
+	}
+
+	sync_div = DMAAUDIO_IO.sync_div;
+	if (sclk==CLKEXT) {
+		pre<<=8;
+		sync_div &= 0xF0FF;
+	} else {
+		sync_div &= 0xFFF0;
+	}
+	sync_div |= pre;
+
+	DMAAUDIO_IO.dev_ctrl = dev_ctrl;
+	DMAAUDIO_IO.dest_ctrl = dest_ctrl;
+	DMAAUDIO_IO.sync_div = sync_div;
+
+	Super(oldstack);
+}
+
+static Uint32 Mint_CheckExternalClock(void)
+{
+#define SIZE_BUF_CLOCK_MEASURE (44100/10)
+
+	unsigned long cookie_snd;
+	Uint32 masterclock;
+	char *buffer;
+	int i;
+
+	/* DSP present with its GPIO port ? */
+	if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
+		return 0;
+	}
+	if ((cookie_snd & SND_DSP)==0) {
+		return 0;
+	}
+
+	buffer = Atari_SysMalloc(SIZE_BUF_CLOCK_MEASURE, MX_STRAM);
+	if (buffer==NULL) {
+		DEBUG_PRINT((DEBUG_NAME "Not enough memory for the measure\n"));
+		return 0;
+	}
+	memset(buffer, 0, SIZE_BUF_CLOCK_MEASURE);
+
+	masterclock=0;
+
+	Buffoper(0);
+	Settracks(0,0);
+	Setmontracks(0);
+	Setmode(MONO8);
+	Jdisint(MFP_TIMERA);
+
+	for (i=0; i<2; i++) {
+		Gpio(GPIO_SET,7);      /* DSP port gpio outputs */
+		Gpio(GPIO_WRITE,2+i);  /* 22.5792/24.576 MHz for 44.1/48KHz */
+		Devconnect2(DMAPLAY, DAC, CLKEXT, CLK50K);  /* Matrix and clock source */
+		Setbuffer(0, buffer, buffer + SIZE_BUF_CLOCK_MEASURE);		           /* Set buffer */
+		Xbtimer(XB_TIMERA, 5, 38, SDL_MintAudio_XbiosInterruptMeasureClock); /* delay mode timer A, prediv /64, 1KHz */
+		Jenabint(MFP_TIMERA);
+		SDL_MintAudio_clocktics = 0;
+		Buffoper(SB_PLA_ENA);
+		usleep(110000);
+
+		if((Buffoper(-1) & 1)==0) {
+			if (SDL_MintAudio_clocktics) {
+				unsigned long khz;
+
+				khz = ((SIZE_BUF_CLOCK_MEASURE/SDL_MintAudio_clocktics) +1) & 0xFFFFFFFE;
+				DEBUG_PRINT((DEBUG_NAME "measure %d: freq=%lu KHz\n", i+1, khz));
+
+				if (i==0) {
+					if(khz==44) {
+						masterclock = MASTERCLOCK_44K;
+					}
+				} else {
+					if(khz==48) {
+						masterclock = MASTERCLOCK_48K;
+					}
+				}
+			} else {
+				DEBUG_PRINT((DEBUG_NAME "No measure\n"));
+			}
+		} else {
+			DEBUG_PRINT((DEBUG_NAME "No SDMA clock\n"));
+		}
+
+		Buffoper(0);             /* stop */
+		Jdisint(MFP_TIMERA);     /* Uninstall interrupt */
+		if (masterclock == 0)
+			break;
+	}
+
+	Mfree(buffer);
+	return masterclock;
+}
+
 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
 {
 	int i;
+	Uint32 extclock;
 
 	DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
 	DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
@@ -202,16 +345,35 @@
 		spec->channels=2;	/* 16 bits always stereo */
 	}
 
-	/* FIXME: check for an external clock */
-	MINTAUDIO_sfreq=1;
-	MINTAUDIO_nfreq=12;
-	for (i=MINTAUDIO_sfreq;i<MINTAUDIO_nfreq;i++) {
-		MINTAUDIO_hardfreq[i]=MASTERCLOCK_FALCON1/(MASTERPREDIV_FALCON*(i+1));
-		DEBUG_PRINT((DEBUG_NAME "calc:freq(%d)=%lu\n", i, MINTAUDIO_hardfreq[i]));
+	extclock=Mint_CheckExternalClock();
+
+	/* Standard clocks */
+	MINTAUDIO_freqcount=0;
+	for (i=1;i<12;i++) {
+		/* Remove unusable Falcon codec predivisors */
+		if ((i==6) || (i==8) || (i==10)) {
+			continue;
+		}
+		SDL_MintAudio_AddFrequency(this, MASTERCLOCK_FALCON1/(MASTERPREDIV_FALCON*(i+1)), MASTERCLOCK_FALCON1, i);
 	}
 
-	MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, 1, spec->freq);
-	spec->freq=MINTAUDIO_hardfreq[MINTAUDIO_numfreq];
+	if (extclock>0) {
+		for (i=1; i<4; i++) {
+			SDL_MintAudio_AddFrequency(this, extclock/(MASTERPREDIV_FALCON*(1<<i)), extclock, (1<<i)-1);
+		}
+	}
+
+#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;
 
 	DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
 	DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
@@ -224,7 +386,7 @@
 
 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
 {
-	int channels_mode;
+	int channels_mode, dmaclock, prediv;
 	void *buffer;
 
 	/* Stop currently playing sound */
@@ -249,10 +411,19 @@
 		DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
 	}
 
-	/* FIXME: select an external clock */
-
-	Devconnect(DMAPLAY, DAC, CLK25M, MINTAUDIO_numfreq, 1);
-	DEBUG_PRINT((DEBUG_NAME "25.175 MHz clock selected, prescaler %d\n", MINTAUDIO_numfreq));
+	dmaclock = MINTAUDIO_frequencies[MINTAUDIO_numfreq].masterclock;
+	prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
+	if (dmaclock != MASTERCLOCK_FALCON1) {
+		Gpio(GPIO_SET,7);		/* DSP port gpio outputs */
+		if (dmaclock == MASTERCLOCK_44K) {
+			Gpio(GPIO_WRITE,2);	/* 22.5792 MHz for 44.1KHz */
+		} else {
+			Gpio(GPIO_WRITE,3);	/* 24.576 MHz for 48KHz */
+		}
+		Devconnect2(DMAPLAY, DAC, CLKEXT, prediv);
+	} else {
+		Devconnect(DMAPLAY, DAC, CLK25M, prediv, 1);
+	}
 
 	/* Set buffer */
 	buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];