src/audio/dc/aica.c
branchSDL-1.3
changeset 1662 782fd950bd46
parent 1461 11134dc42da8
child 1663 11775724e3fe
--- a/src/audio/dc/aica.c	Sun May 21 17:27:13 2006 +0000
+++ b/src/audio/dc/aica.c	Sun May 28 13:04:16 2006 +0000
@@ -9,8 +9,8 @@
 #include <arch/irq.h>
 #include <dc/spu.h>
 
-/* #define dc_snd_base ((volatile unsigned char *)0x00800000) */ /* arm side */
-#define dc_snd_base ((volatile unsigned char *)0xa0700000) /* dc side */
+                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 /* #define dc_snd_base ((volatile unsigned char *)0x00800000) *//* arm side */
+#define dc_snd_base ((volatile unsigned char *)0xa0700000)      /* dc side */
 
 /* Some convienence macros */
 #define	SNDREGADDR(x)	(0xa0700000 + (x))
@@ -39,26 +39,29 @@
 	} while(0)
 
 
-void aica_init() {
-	int i, j, old = 0;
-	
-	/* Initialize AICA channels */	
-	G2_LOCK(old);
-	SNDREG32(0x2800) = 0x0000;
-	
-	for (i=0; i<64; i++) {
-		for (j=0; j<0x80; j+=4) {
-			if ((j&31)==0) g2_fifo_wait();
-			CHNREG32(i, j) = 0;
-		}
-		g2_fifo_wait();
-		CHNREG32(i,0) = 0x8000;
-		CHNREG32(i,20) = 0x1f;
-	}
+void
+aica_init ()
+{
+    int i, j, old = 0;
+
+    /* Initialize AICA channels */
+    G2_LOCK (old);
+    SNDREG32 (0x2800) = 0x0000;
 
-	SNDREG32(0x2800) = 0x000f;
-	g2_fifo_wait();
-	G2_UNLOCK(old);
+    for (i = 0; i < 64; i++) {
+        for (j = 0; j < 0x80; j += 4) {
+            if ((j & 31) == 0)
+                g2_fifo_wait ();
+            CHNREG32 (i, j) = 0;
+        }
+        g2_fifo_wait ();
+        CHNREG32 (i, 0) = 0x8000;
+        CHNREG32 (i, 20) = 0x1f;
+    }
+
+    SNDREG32 (0x2800) = 0x000f;
+    g2_fifo_wait ();
+    G2_UNLOCK (old);
 }
 
 /* Translates a volume from linear form to logarithmic form (required by
@@ -86,25 +89,25 @@
 }; */
 
 const static unsigned char logs[] = {
-	0, 15, 22, 27, 31, 35, 39, 42, 45, 47, 50, 52, 55, 57, 59, 61,
-	63, 65, 67, 69, 71, 73, 74, 76, 78, 79, 81, 82, 84, 85, 87, 88,
-	90, 91, 92, 94, 95, 96, 98, 99, 100, 102, 103, 104, 105, 106,
-	108, 109, 110, 111, 112, 113, 114, 116, 117, 118, 119, 120, 121,
-	122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134,
-	135, 136, 137, 138, 138, 139, 140, 141, 142, 143, 144, 145, 146,
-	146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 156,
-	157, 158, 159, 160, 160, 161, 162, 163, 164, 164, 165, 166, 167,
-	167, 168, 169, 170, 170, 171, 172, 173, 173, 174, 175, 176, 176,
-	177, 178, 178, 179, 180, 181, 181, 182, 183, 183, 184, 185, 185,
-	186, 187, 187, 188, 189, 189, 190, 191, 191, 192, 193, 193, 194,
-	195, 195, 196, 197, 197, 198, 199, 199, 200, 200, 201, 202, 202,
-	203, 204, 204, 205, 205, 206, 207, 207, 208, 209, 209, 210, 210,
-	211, 212, 212, 213, 213, 214, 215, 215, 216, 216, 217, 217, 218,
-	219, 219, 220, 220, 221, 221, 222, 223, 223, 224, 224, 225, 225,
-	226, 227, 227, 228, 228, 229, 229, 230, 230, 231, 232, 232, 233,
-	233, 234, 234, 235, 235, 236, 236, 237, 237, 238, 239, 239, 240,
-	240, 241, 241, 242, 242, 243, 243, 244, 244, 245, 245, 246, 246,
-	247, 247, 248, 248, 249, 249, 250, 250, 251, 251, 252, 252, 253, 254, 255
+    0, 15, 22, 27, 31, 35, 39, 42, 45, 47, 50, 52, 55, 57, 59, 61,
+    63, 65, 67, 69, 71, 73, 74, 76, 78, 79, 81, 82, 84, 85, 87, 88,
+    90, 91, 92, 94, 95, 96, 98, 99, 100, 102, 103, 104, 105, 106,
+    108, 109, 110, 111, 112, 113, 114, 116, 117, 118, 119, 120, 121,
+    122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134,
+    135, 136, 137, 138, 138, 139, 140, 141, 142, 143, 144, 145, 146,
+    146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 156,
+    157, 158, 159, 160, 160, 161, 162, 163, 164, 164, 165, 166, 167,
+    167, 168, 169, 170, 170, 171, 172, 173, 173, 174, 175, 176, 176,
+    177, 178, 178, 179, 180, 181, 181, 182, 183, 183, 184, 185, 185,
+    186, 187, 187, 188, 189, 189, 190, 191, 191, 192, 193, 193, 194,
+    195, 195, 196, 197, 197, 198, 199, 199, 200, 200, 201, 202, 202,
+    203, 204, 204, 205, 205, 206, 207, 207, 208, 209, 209, 210, 210,
+    211, 212, 212, 213, 213, 214, 215, 215, 216, 216, 217, 217, 218,
+    219, 219, 220, 220, 221, 221, 222, 223, 223, 224, 224, 225, 225,
+    226, 227, 227, 228, 228, 229, 229, 230, 230, 231, 232, 232, 233,
+    233, 234, 234, 235, 235, 236, 236, 237, 237, 238, 239, 239, 240,
+    240, 241, 241, 242, 242, 243, 243, 244, 244, 245, 245, 246, 246,
+    247, 247, 248, 248, 249, 249, 250, 250, 251, 251, 252, 252, 253, 254, 255
 };
 
 /* For the moment this is going to have to suffice, until we really
@@ -113,23 +116,25 @@
 #define AICA_VOL(x) (0xff - logs[128 + (((x) & 0xff) / 2)])
 //#define AICA_VOL(x) (0xff - logs[x&255])
 
-static inline unsigned  AICA_FREQ(unsigned freq)	{
-	unsigned long freq_lo, freq_base = 5644800;
-	int freq_hi = 7;
+static inline unsigned
+AICA_FREQ (unsigned freq)
+{
+    unsigned long freq_lo, freq_base = 5644800;
+    int freq_hi = 7;
 
-	/* Need to convert frequency to floating point format
-	   (freq_hi is exponent, freq_lo is mantissa)
-	   Formula is ferq = 44100*2^freq_hi*(1+freq_lo/1024) */
-	while (freq < freq_base && freq_hi > -8) {
-		freq_base >>= 1;
-		--freq_hi;
-	}
-	while (freq < freq_base && freq_hi > -8) {
-		freq_base >>= 1;
-		freq_hi--;
-	}
-	freq_lo = (freq<<10) / freq_base;
-	return (freq_hi << 11) | (freq_lo & 1023);
+    /* Need to convert frequency to floating point format
+       (freq_hi is exponent, freq_lo is mantissa)
+       Formula is ferq = 44100*2^freq_hi*(1+freq_lo/1024) */
+    while (freq < freq_base && freq_hi > -8) {
+        freq_base >>= 1;
+        --freq_hi;
+    }
+    while (freq < freq_base && freq_hi > -8) {
+        freq_base >>= 1;
+        freq_hi--;
+    }
+    freq_lo = (freq << 10) / freq_base;
+    return (freq_hi << 11) | (freq_lo & 1023);
 }
 
 /* Sets up a sound channel completely. This is generally good if you want
@@ -148,15 +153,18 @@
 
    This routine (and the similar ones) owe a lot to Marcus' sound example -- 
    I hadn't gotten quite this far into dissecting the individual regs yet. */
-void aica_play(int ch,int mode,unsigned long smpptr,int loopst,int loopend,int freq,int vol,int pan,int loopflag) {
+void
+aica_play (int ch, int mode, unsigned long smpptr, int loopst, int loopend,
+           int freq, int vol, int pan, int loopflag)
+{
 /*	int i;
 */
-	int val;
-	int old = 0;
+    int val;
+    int old = 0;
 
-	/* Stop the channel (if it's already playing) */
-	aica_stop(ch);
-	/* doesn't seem to be needed, but it's here just in case */
+    /* Stop the channel (if it's already playing) */
+    aica_stop (ch);
+    /* doesn't seem to be needed, but it's here just in case */
 /*
 	for (i=0; i<256; i++) {
 		asm("nop");
@@ -165,107 +173,127 @@
 		asm("nop");
 	}
 */
-	G2_LOCK(old);
-	/* Envelope setup. The first of these is the loop point,
-	   e.g., where the sample starts over when it loops. The second
-	   is the loop end. This is the full length of the sample when
-	   you are not looping, or the loop end point when you are (though
-	   storing more than that is a waste of memory if you're not doing
-	   volume enveloping). */
-	CHNREG32(ch, 8) = loopst & 0xffff;
-	CHNREG32(ch, 12) = loopend & 0xffff;
-	
-	/* Write resulting values */
-	CHNREG32(ch, 24) = AICA_FREQ(freq);
-	
-	/* Set volume, pan, and some other things that we don't know what
-	   they do =) */
-	CHNREG32(ch, 36) = AICA_PAN(pan) | (0xf<<8);
-	/* Convert the incoming volume and pan into hardware values */
-	/* Vol starts at zero so we can ramp */
-	vol = AICA_VOL(vol);
-	CHNREG32(ch, 40) = 0x24 | (vol<<8);
-	/* Convert the incoming volume and pan into hardware values */
-	/* Vol starts at zero so we can ramp */
+    G2_LOCK (old);
+    /* Envelope setup. The first of these is the loop point,
+       e.g., where the sample starts over when it loops. The second
+       is the loop end. This is the full length of the sample when
+       you are not looping, or the loop end point when you are (though
+       storing more than that is a waste of memory if you're not doing
+       volume enveloping). */
+    CHNREG32 (ch, 8) = loopst & 0xffff;
+    CHNREG32 (ch, 12) = loopend & 0xffff;
+
+    /* Write resulting values */
+    CHNREG32 (ch, 24) = AICA_FREQ (freq);
+
+    /* Set volume, pan, and some other things that we don't know what
+       they do =) */
+    CHNREG32 (ch, 36) = AICA_PAN (pan) | (0xf << 8);
+    /* Convert the incoming volume and pan into hardware values */
+    /* Vol starts at zero so we can ramp */
+    vol = AICA_VOL (vol);
+    CHNREG32 (ch, 40) = 0x24 | (vol << 8);
+    /* Convert the incoming volume and pan into hardware values */
+    /* Vol starts at zero so we can ramp */
 
-	/* If we supported volume envelopes (which we don't yet) then
-	   this value would set that up. The top 4 bits determine the
-	   envelope speed. f is the fastest, 1 is the slowest, and 0
-	   seems to be an invalid value and does weird things). The
-	   default (below) sets it into normal mode (play and terminate/loop).
-	CHNREG32(ch, 16) = 0xf010;
-	*/
-	CHNREG32(ch, 16) = 0x1f;	/* No volume envelope */
-	
-	
-	/* Set sample format, buffer address, and looping control. If
-	   0x0200 mask is set on reg 0, the sample loops infinitely. If
-	   it's not set, the sample plays once and terminates. We'll
-	   also set the bits to start playback here. */
-	CHNREG32(ch, 4) = smpptr & 0xffff;
-	val = 0xc000 | 0x0000 | (mode<<7) | (smpptr >> 16);
-	if (loopflag) val|=0x200;
-	
-	CHNREG32(ch, 0) = val;
-	
-	G2_UNLOCK(old);
+    /* If we supported volume envelopes (which we don't yet) then
+       this value would set that up. The top 4 bits determine the
+       envelope speed. f is the fastest, 1 is the slowest, and 0
+       seems to be an invalid value and does weird things). The
+       default (below) sets it into normal mode (play and terminate/loop).
+       CHNREG32(ch, 16) = 0xf010;
+     */
+    CHNREG32 (ch, 16) = 0x1f;   /* No volume envelope */
+
 
-	/* Enable playback */
-	/* CHNREG32(ch, 0) |= 0xc000; */
-	g2_fifo_wait();
+    /* Set sample format, buffer address, and looping control. If
+       0x0200 mask is set on reg 0, the sample loops infinitely. If
+       it's not set, the sample plays once and terminates. We'll
+       also set the bits to start playback here. */
+    CHNREG32 (ch, 4) = smpptr & 0xffff;
+    val = 0xc000 | 0x0000 | (mode << 7) | (smpptr >> 16);
+    if (loopflag)
+        val |= 0x200;
+
+    CHNREG32 (ch, 0) = val;
+
+    G2_UNLOCK (old);
+
+    /* Enable playback */
+    /* CHNREG32(ch, 0) |= 0xc000; */
+    g2_fifo_wait ();
 
 #if 0
-	for (i=0xff; i>=vol; i--) {
-		if ((i&7)==0) g2_fifo_wait();
-		CHNREG32(ch, 40) =  0x24 | (i<<8);;
-	}
+    for (i = 0xff; i >= vol; i--) {
+        if ((i & 7) == 0)
+            g2_fifo_wait ();
+        CHNREG32 (ch, 40) = 0x24 | (i << 8);;
+    }
 
-	g2_fifo_wait();
+    g2_fifo_wait ();
 #endif
 }
 
 /* Stop the sound on a given channel */
-void aica_stop(int ch) {
-	g2_write_32(CHNREGADDR(ch, 0),(g2_read_32(CHNREGADDR(ch, 0)) & ~0x4000) | 0x8000);
-	g2_fifo_wait();
+void
+aica_stop (int ch)
+{
+    g2_write_32 (CHNREGADDR (ch, 0),
+                 (g2_read_32 (CHNREGADDR (ch, 0)) & ~0x4000) | 0x8000);
+    g2_fifo_wait ();
 }
 
 
 /* The rest of these routines can change the channel in mid-stride so you
    can do things like vibrato and panning effects. */
-   
+
 /* Set channel volume */
-void aica_vol(int ch,int vol) {
-//	g2_write_8(CHNREGADDR(ch, 41),AICA_VOL(vol));
-	g2_write_32(CHNREGADDR(ch, 40),(g2_read_32(CHNREGADDR(ch, 40))&0xffff00ff)|(AICA_VOL(vol)<<8) );
-	g2_fifo_wait();
+void
+aica_vol (int ch, int vol)
+{
+//      g2_write_8(CHNREGADDR(ch, 41),AICA_VOL(vol));
+    g2_write_32 (CHNREGADDR (ch, 40),
+                 (g2_read_32 (CHNREGADDR (ch, 40)) & 0xffff00ff) |
+                 (AICA_VOL (vol) << 8));
+    g2_fifo_wait ();
 }
 
 /* Set channel pan */
-void aica_pan(int ch,int pan) {
-//	g2_write_8(CHNREGADDR(ch, 36),AICA_PAN(pan));
-	g2_write_32(CHNREGADDR(ch, 36),(g2_read_32(CHNREGADDR(ch, 36))&0xffffff00)|(AICA_PAN(pan)) );
-	g2_fifo_wait();
+void
+aica_pan (int ch, int pan)
+{
+//      g2_write_8(CHNREGADDR(ch, 36),AICA_PAN(pan));
+    g2_write_32 (CHNREGADDR (ch, 36),
+                 (g2_read_32 (CHNREGADDR (ch, 36)) & 0xffffff00) |
+                 (AICA_PAN (pan)));
+    g2_fifo_wait ();
 }
 
 /* Set channel frequency */
-void aica_freq(int ch,int freq) {
-	g2_write_32(CHNREGADDR(ch, 24),AICA_FREQ(freq));
-	g2_fifo_wait();
+void
+aica_freq (int ch, int freq)
+{
+    g2_write_32 (CHNREGADDR (ch, 24), AICA_FREQ (freq));
+    g2_fifo_wait ();
 }
 
 /* Get channel position */
-int aica_get_pos(int ch) {
+int
+aica_get_pos (int ch)
+{
 #if 1
-	/* Observe channel ch */
-	g2_write_32(SNDREGADDR(0x280c),(g2_read_32(SNDREGADDR(0x280c))&0xffff00ff) | (ch<<8));
-	g2_fifo_wait();
-	/* Update position counters */
-	return g2_read_32(SNDREGADDR(0x2814)) & 0xffff;
+    /* Observe channel ch */
+    g2_write_32 (SNDREGADDR (0x280c),
+                 (g2_read_32 (SNDREGADDR (0x280c)) & 0xffff00ff) | (ch << 8));
+    g2_fifo_wait ();
+    /* Update position counters */
+    return g2_read_32 (SNDREGADDR (0x2814)) & 0xffff;
 #else
-	/* Observe channel ch */
-	g2_write_8(SNDREGADDR(0x280d),ch);
-	/* Update position counters */
-	return g2_read_32(SNDREGADDR(0x2814)) & 0xffff;
+    /* Observe channel ch */
+    g2_write_8 (SNDREGADDR (0x280d), ch);
+    /* Update position counters */
+    return g2_read_32 (SNDREGADDR (0x2814)) & 0xffff;
 #endif
 }
+
+/* vi: set ts=4 sw=4 expandtab: */