annotate src/audio/dc/aica.c @ 3235:d35b649858e0

David Carre to Sam Hello sam, me again. I'v fixed another bug in the pandora code, it's on the no-X videodriver, i forgot to add some code to destroy the window so it was impossible to reload SDL inside the same application (eglTerminate). You'll find the svn diff attached. See you, David.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 11 Aug 2009 13:45:01 +0000
parents c121d94672cb
children
rev   line source
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1 /* This file is part of the Dreamcast function library.
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2 * Please see libdream.c for further details.
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3 *
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4 * (c)2000 Dan Potter
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5 * modify BERO
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6 */
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7 #include "aica.h"
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8
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9 #include <arch/irq.h>
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10 #include <dc/spu.h>
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11
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12 #if 0
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13 #define dc_snd_base ((volatile unsigned char *)0x00800000) /* arm side */
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14 #endif
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15 #define dc_snd_base ((volatile unsigned char *)0xa0700000) /* dc side */
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16
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17 /* Some convienence macros */
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18 #define SNDREGADDR(x) (0xa0700000 + (x))
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19 #define CHNREGADDR(ch,x) SNDREGADDR(0x80*(ch)+(x))
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20
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21
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22 #define SNDREG32(x) (*(volatile unsigned long *)SNDREGADDR(x))
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23 #define SNDREG8(x) (*(volatile unsigned char *)SNDREGADDR(x))
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24 #define CHNREG32(ch, x) (*(volatile unsigned long *)CHNREGADDR(ch,x))
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25 #define CHNREG8(ch, x) (*(volatile unsigned long *)CHNREGADDR(ch,x))
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26
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27 #define G2_LOCK(OLD) \
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28 do { \
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29 if (!irq_inside_int()) \
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30 OLD = irq_disable(); \
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31 /* suspend any G2 DMA here... */ \
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32 while((*(volatile unsigned int *)0xa05f688c) & 0x20) \
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33 ; \
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34 } while(0)
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35
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36 #define G2_UNLOCK(OLD) \
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37 do { \
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38 /* resume any G2 DMA here... */ \
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39 if (!irq_inside_int()) \
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40 irq_restore(OLD); \
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41 } while(0)
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42
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43
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44 void
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45 aica_init()
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46 {
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47 int i, j, old = 0;
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48
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49 /* Initialize AICA channels */
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50 G2_LOCK(old);
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51 SNDREG32(0x2800) = 0x0000;
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52
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53 for (i = 0; i < 64; i++) {
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54 for (j = 0; j < 0x80; j += 4) {
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55 if ((j & 31) == 0)
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56 g2_fifo_wait();
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57 CHNREG32(i, j) = 0;
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58 }
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59 g2_fifo_wait();
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60 CHNREG32(i, 0) = 0x8000;
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61 CHNREG32(i, 20) = 0x1f;
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62 }
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63
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64 SNDREG32(0x2800) = 0x000f;
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65 g2_fifo_wait();
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66 G2_UNLOCK(old);
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67 }
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68
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69 /* Translates a volume from linear form to logarithmic form (required by
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70 the AICA chip */
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71 /* int logs[] = {
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72
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73 0, 40, 50, 58, 63, 68, 73, 77, 80, 83, 86, 89, 92, 94, 97, 99, 101, 103,
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74 105, 107, 109, 111, 112, 114, 116, 117, 119, 120, 122, 123, 125, 126, 127,
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75 129, 130, 131, 133, 134, 135, 136, 137, 139, 140, 141, 142, 143, 144, 145,
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76 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 156, 157, 158, 159,
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77 160, 161, 162, 162, 163, 164, 165, 166, 166, 167, 168, 169, 170, 170, 171,
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78 172, 172, 173, 174, 175, 175, 176, 177, 177, 178, 179, 180, 180, 181, 182,
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79 182, 183, 183, 184, 185, 185, 186, 187, 187, 188, 188, 189, 190, 190, 191,
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80 191, 192, 193, 193, 194, 194, 195, 196, 196, 197, 197, 198, 198, 199, 199,
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81 200, 201, 201, 202, 202, 203, 203, 204, 204, 205, 205, 206, 206, 207, 207,
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82 208, 208, 209, 209, 210, 210, 211, 211, 212, 212, 213, 213, 214, 214, 215,
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83 215, 216, 216, 217, 217, 217, 218, 218, 219, 219, 220, 220, 221, 221, 222,
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84 222, 222, 223, 223, 224, 224, 225, 225, 225, 226, 226, 227, 227, 228, 228,
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85 228, 229, 229, 230, 230, 230, 231, 231, 232, 232, 232, 233, 233, 234, 234,
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86 234, 235, 235, 236, 236, 236, 237, 237, 238, 238, 238, 239, 239, 240, 240,
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87 240, 241, 241, 241, 242, 242, 243, 243, 243, 244, 244, 244, 245, 245, 245,
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88 246, 246, 247, 247, 247, 248, 248, 248, 249, 249, 249, 250, 250, 250, 251,
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89 251, 251, 252, 252, 252, 253, 253, 253, 254, 254, 254, 255
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90
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91 }; */
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92
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93 const static unsigned char logs[] = {
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94 0, 15, 22, 27, 31, 35, 39, 42, 45, 47, 50, 52, 55, 57, 59, 61,
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95 63, 65, 67, 69, 71, 73, 74, 76, 78, 79, 81, 82, 84, 85, 87, 88,
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96 90, 91, 92, 94, 95, 96, 98, 99, 100, 102, 103, 104, 105, 106,
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97 108, 109, 110, 111, 112, 113, 114, 116, 117, 118, 119, 120, 121,
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98 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134,
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99 135, 136, 137, 138, 138, 139, 140, 141, 142, 143, 144, 145, 146,
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100 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 156,
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101 157, 158, 159, 160, 160, 161, 162, 163, 164, 164, 165, 166, 167,
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102 167, 168, 169, 170, 170, 171, 172, 173, 173, 174, 175, 176, 176,
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103 177, 178, 178, 179, 180, 181, 181, 182, 183, 183, 184, 185, 185,
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104 186, 187, 187, 188, 189, 189, 190, 191, 191, 192, 193, 193, 194,
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105 195, 195, 196, 197, 197, 198, 199, 199, 200, 200, 201, 202, 202,
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106 203, 204, 204, 205, 205, 206, 207, 207, 208, 209, 209, 210, 210,
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107 211, 212, 212, 213, 213, 214, 215, 215, 216, 216, 217, 217, 218,
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108 219, 219, 220, 220, 221, 221, 222, 223, 223, 224, 224, 225, 225,
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109 226, 227, 227, 228, 228, 229, 229, 230, 230, 231, 232, 232, 233,
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110 233, 234, 234, 235, 235, 236, 236, 237, 237, 238, 239, 239, 240,
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111 240, 241, 241, 242, 242, 243, 243, 244, 244, 245, 245, 246, 246,
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112 247, 247, 248, 248, 249, 249, 250, 250, 251, 251, 252, 252, 253, 254, 255
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113 };
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114
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115 /* For the moment this is going to have to suffice, until we really
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116 figure out what these mean. */
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117 #define AICA_PAN(x) ((x)==0x80?(0):((x)<0x80?(0x1f):(0x0f)))
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118 #define AICA_VOL(x) (0xff - logs[128 + (((x) & 0xff) / 2)])
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119 //#define AICA_VOL(x) (0xff - logs[x&255])
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120
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121 static inline unsigned
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122 AICA_FREQ(unsigned freq)
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123 {
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124 unsigned long freq_lo, freq_base = 5644800;
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125 int freq_hi = 7;
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126
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127 /* Need to convert frequency to floating point format
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128 (freq_hi is exponent, freq_lo is mantissa)
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129 Formula is ferq = 44100*2^freq_hi*(1+freq_lo/1024) */
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130 while (freq < freq_base && freq_hi > -8) {
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131 freq_base >>= 1;
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132 --freq_hi;
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133 }
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134 while (freq < freq_base && freq_hi > -8) {
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135 freq_base >>= 1;
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136 freq_hi--;
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137 }
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138 freq_lo = (freq << 10) / freq_base;
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139 return (freq_hi << 11) | (freq_lo & 1023);
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140 }
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141
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142 /* Sets up a sound channel completely. This is generally good if you want
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143 a quick and dirty way to play notes. If you want a more comprehensive
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144 set of routines (more like PC wavetable cards) see below.
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145
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146 ch is the channel to play on (0 - 63)
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147 smpptr is the pointer to the sound data; if you're running off the
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148 SH4, then this ought to be (ptr - 0xa0800000); otherwise it's just
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149 ptr. Basically, it's an offset into sound ram.
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150 mode is one of the mode constants (16 bit, 8 bit, ADPCM)
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151 nsamp is the number of samples to play (not number of bytes!)
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152 freq is the sampling rate of the sound
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153 vol is the volume, 0 to 0xff (0xff is louder)
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154 pan is a panning constant -- 0 is left, 128 is center, 255 is right.
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155
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156 This routine (and the similar ones) owe a lot to Marcus' sound example --
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157 I hadn't gotten quite this far into dissecting the individual regs yet. */
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158 void
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159 aica_play(int ch, int mode, unsigned long smpptr, int loopst, int loopend,
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160 int freq, int vol, int pan, int loopflag)
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161 {
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162 /* int i;
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163 */
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164 int val;
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165 int old = 0;
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166
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167 /* Stop the channel (if it's already playing) */
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168 aica_stop(ch);
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169 /* doesn't seem to be needed, but it's here just in case */
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170 /*
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171 for (i=0; i<256; i++) {
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172 asm("nop");
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173 asm("nop");
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174 asm("nop");
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175 asm("nop");
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176 }
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177 */
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178 G2_LOCK(old);
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179 /* Envelope setup. The first of these is the loop point,
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180 e.g., where the sample starts over when it loops. The second
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181 is the loop end. This is the full length of the sample when
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182 you are not looping, or the loop end point when you are (though
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183 storing more than that is a waste of memory if you're not doing
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184 volume enveloping). */
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185 CHNREG32(ch, 8) = loopst & 0xffff;
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186 CHNREG32(ch, 12) = loopend & 0xffff;
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187
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188 /* Write resulting values */
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189 CHNREG32(ch, 24) = AICA_FREQ(freq);
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190
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191 /* Set volume, pan, and some other things that we don't know what
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192 they do =) */
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193 CHNREG32(ch, 36) = AICA_PAN(pan) | (0xf << 8);
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194 /* Convert the incoming volume and pan into hardware values */
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195 /* Vol starts at zero so we can ramp */
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196 vol = AICA_VOL(vol);
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197 CHNREG32(ch, 40) = 0x24 | (vol << 8);
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198 /* Convert the incoming volume and pan into hardware values */
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199 /* Vol starts at zero so we can ramp */
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200
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201 /* If we supported volume envelopes (which we don't yet) then
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202 this value would set that up. The top 4 bits determine the
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203 envelope speed. f is the fastest, 1 is the slowest, and 0
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204 seems to be an invalid value and does weird things). The
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205 default (below) sets it into normal mode (play and terminate/loop).
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206 CHNREG32(ch, 16) = 0xf010;
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207 */
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208 CHNREG32(ch, 16) = 0x1f; /* No volume envelope */
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209
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210
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211 /* Set sample format, buffer address, and looping control. If
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212 0x0200 mask is set on reg 0, the sample loops infinitely. If
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213 it's not set, the sample plays once and terminates. We'll
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214 also set the bits to start playback here. */
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215 CHNREG32(ch, 4) = smpptr & 0xffff;
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216 val = 0xc000 | 0x0000 | (mode << 7) | (smpptr >> 16);
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217 if (loopflag)
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218 val |= 0x200;
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219
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220 CHNREG32(ch, 0) = val;
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221
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222 G2_UNLOCK(old);
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223
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224 /* Enable playback */
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225 /* CHNREG32(ch, 0) |= 0xc000; */
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226 g2_fifo_wait();
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227
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228 #if 0
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229 for (i = 0xff; i >= vol; i--) {
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230 if ((i & 7) == 0)
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231 g2_fifo_wait();
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232 CHNREG32(ch, 40) = 0x24 | (i << 8);;
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233 }
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234
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235 g2_fifo_wait();
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236 #endif
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237 }
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238
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239 /* Stop the sound on a given channel */
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240 void
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241 aica_stop(int ch)
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242 {
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243 g2_write_32(CHNREGADDR(ch, 0),
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244 (g2_read_32(CHNREGADDR(ch, 0)) & ~0x4000) | 0x8000);
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245 g2_fifo_wait();
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246 }
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247
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248
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249 /* The rest of these routines can change the channel in mid-stride so you
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250 can do things like vibrato and panning effects. */
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251
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252 /* Set channel volume */
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253 void
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254 aica_vol(int ch, int vol)
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255 {
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256 // g2_write_8(CHNREGADDR(ch, 41),AICA_VOL(vol));
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257 g2_write_32(CHNREGADDR(ch, 40),
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258 (g2_read_32(CHNREGADDR(ch, 40)) & 0xffff00ff) |
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259 (AICA_VOL(vol) << 8));
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260 g2_fifo_wait();
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261 }
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262
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263 /* Set channel pan */
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264 void
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265 aica_pan(int ch, int pan)
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266 {
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267 // g2_write_8(CHNREGADDR(ch, 36),AICA_PAN(pan));
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268 g2_write_32(CHNREGADDR(ch, 36),
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269 (g2_read_32(CHNREGADDR(ch, 36)) & 0xffffff00) |
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270 (AICA_PAN(pan)));
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271 g2_fifo_wait();
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272 }
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273
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274 /* Set channel frequency */
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275 void
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276 aica_freq(int ch, int freq)
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277 {
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278 g2_write_32(CHNREGADDR(ch, 24), AICA_FREQ(freq));
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279 g2_fifo_wait();
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280 }
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281
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282 /* Get channel position */
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283 int
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284 aica_get_pos(int ch)
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285 {
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286 #if 1
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287 /* Observe channel ch */
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288 g2_write_32(SNDREGADDR(0x280c),
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289 (g2_read_32(SNDREGADDR(0x280c)) & 0xffff00ff) | (ch << 8));
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290 g2_fifo_wait();
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291 /* Update position counters */
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292 return g2_read_32(SNDREGADDR(0x2814)) & 0xffff;
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293 #else
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294 /* Observe channel ch */
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295 g2_write_8(SNDREGADDR(0x280d), ch);
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296 /* Update position counters */
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297 return g2_read_32(SNDREGADDR(0x2814)) & 0xffff;
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298 #endif
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299 }
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300
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301 /* vi: set ts=4 sw=4 expandtab: */