Mercurial > sdl-ios-xcode

annotate src/audio/dc/aica.c @ 4333:55717a755897 SDL-1.2

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Switched from setting the period size and count to setting the buffer size directly, based on feedback from the ALSA development list: http://mailman.alsa-project.org/pipermail/alsa-devel/2009-October/022267.html This has the nice side effect of reducing latency on my SBLive! card.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 13 Oct 2009 09:56:15 +0000
parents 11134dc42da8
children 782fd950bd46 c121d94672cb
rev   line source
509
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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 /* #define dc_snd_base ((volatile unsigned char *)0x00800000) */ /* arm side */
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13 #define dc_snd_base ((volatile unsigned char *)0xa0700000) /* dc side */
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14
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15 /* Some convienence macros */
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16 #define SNDREGADDR(x) (0xa0700000 + (x))
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17 #define CHNREGADDR(ch,x) SNDREGADDR(0x80*(ch)+(x))
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18
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19
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20 #define SNDREG32(x) (*(volatile unsigned long *)SNDREGADDR(x))
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21 #define SNDREG8(x) (*(volatile unsigned char *)SNDREGADDR(x))
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22 #define CHNREG32(ch, x) (*(volatile unsigned long *)CHNREGADDR(ch,x))
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23 #define CHNREG8(ch, x) (*(volatile unsigned long *)CHNREGADDR(ch,x))
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24
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25 #define G2_LOCK(OLD) \
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26 do { \
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27 if (!irq_inside_int()) \
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28 OLD = irq_disable(); \
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29 /* suspend any G2 DMA here... */ \
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30 while((*(volatile unsigned int *)0xa05f688c) & 0x20) \
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31 ; \
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32 } while(0)
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33
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34 #define G2_UNLOCK(OLD) \
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35 do { \
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36 /* resume any G2 DMA here... */ \
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37 if (!irq_inside_int()) \
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38 irq_restore(OLD); \
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39 } while(0)
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40
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41
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42 void aica_init() {
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43 int i, j, old = 0;
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44
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45 /* Initialize AICA channels */
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46 G2_LOCK(old);
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47 SNDREG32(0x2800) = 0x0000;
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48
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49 for (i=0; i<64; i++) {
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50 for (j=0; j<0x80; j+=4) {
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51 if ((j&31)==0) g2_fifo_wait();
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52 CHNREG32(i, j) = 0;
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53 }
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54 g2_fifo_wait();
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55 CHNREG32(i,0) = 0x8000;
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56 CHNREG32(i,20) = 0x1f;
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57 }
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58
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59 SNDREG32(0x2800) = 0x000f;
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60 g2_fifo_wait();
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61 G2_UNLOCK(old);
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62 }
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63
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64 /* Translates a volume from linear form to logarithmic form (required by
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65 the AICA chip */
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66 /* int logs[] = {
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67
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68 0, 40, 50, 58, 63, 68, 73, 77, 80, 83, 86, 89, 92, 94, 97, 99, 101, 103,
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69 105, 107, 109, 111, 112, 114, 116, 117, 119, 120, 122, 123, 125, 126, 127,
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70 129, 130, 131, 133, 134, 135, 136, 137, 139, 140, 141, 142, 143, 144, 145,
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71 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 156, 157, 158, 159,
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72 160, 161, 162, 162, 163, 164, 165, 166, 166, 167, 168, 169, 170, 170, 171,
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73 172, 172, 173, 174, 175, 175, 176, 177, 177, 178, 179, 180, 180, 181, 182,
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74 182, 183, 183, 184, 185, 185, 186, 187, 187, 188, 188, 189, 190, 190, 191,
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75 191, 192, 193, 193, 194, 194, 195, 196, 196, 197, 197, 198, 198, 199, 199,
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76 200, 201, 201, 202, 202, 203, 203, 204, 204, 205, 205, 206, 206, 207, 207,
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77 208, 208, 209, 209, 210, 210, 211, 211, 212, 212, 213, 213, 214, 214, 215,
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78 215, 216, 216, 217, 217, 217, 218, 218, 219, 219, 220, 220, 221, 221, 222,
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79 222, 222, 223, 223, 224, 224, 225, 225, 225, 226, 226, 227, 227, 228, 228,
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80 228, 229, 229, 230, 230, 230, 231, 231, 232, 232, 232, 233, 233, 234, 234,
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81 234, 235, 235, 236, 236, 236, 237, 237, 238, 238, 238, 239, 239, 240, 240,
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82 240, 241, 241, 241, 242, 242, 243, 243, 243, 244, 244, 244, 245, 245, 245,
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83 246, 246, 247, 247, 247, 248, 248, 248, 249, 249, 249, 250, 250, 250, 251,
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84 251, 251, 252, 252, 252, 253, 253, 253, 254, 254, 254, 255
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85
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86 }; */
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87
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88 const static unsigned char logs[] = {
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89 0, 15, 22, 27, 31, 35, 39, 42, 45, 47, 50, 52, 55, 57, 59, 61,
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90 63, 65, 67, 69, 71, 73, 74, 76, 78, 79, 81, 82, 84, 85, 87, 88,
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91 90, 91, 92, 94, 95, 96, 98, 99, 100, 102, 103, 104, 105, 106,
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92 108, 109, 110, 111, 112, 113, 114, 116, 117, 118, 119, 120, 121,
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93 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134,
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94 135, 136, 137, 138, 138, 139, 140, 141, 142, 143, 144, 145, 146,
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95 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 156,
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96 157, 158, 159, 160, 160, 161, 162, 163, 164, 164, 165, 166, 167,
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97 167, 168, 169, 170, 170, 171, 172, 173, 173, 174, 175, 176, 176,
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98 177, 178, 178, 179, 180, 181, 181, 182, 183, 183, 184, 185, 185,
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99 186, 187, 187, 188, 189, 189, 190, 191, 191, 192, 193, 193, 194,
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100 195, 195, 196, 197, 197, 198, 199, 199, 200, 200, 201, 202, 202,
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101 203, 204, 204, 205, 205, 206, 207, 207, 208, 209, 209, 210, 210,
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102 211, 212, 212, 213, 213, 214, 215, 215, 216, 216, 217, 217, 218,
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103 219, 219, 220, 220, 221, 221, 222, 223, 223, 224, 224, 225, 225,
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104 226, 227, 227, 228, 228, 229, 229, 230, 230, 231, 232, 232, 233,
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105 233, 234, 234, 235, 235, 236, 236, 237, 237, 238, 239, 239, 240,
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106 240, 241, 241, 242, 242, 243, 243, 244, 244, 245, 245, 246, 246,
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107 247, 247, 248, 248, 249, 249, 250, 250, 251, 251, 252, 252, 253, 254, 255
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108 };
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109
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110 /* For the moment this is going to have to suffice, until we really
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111 figure out what these mean. */
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112 #define AICA_PAN(x) ((x)==0x80?(0):((x)<0x80?(0x1f):(0x0f)))
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113 #define AICA_VOL(x) (0xff - logs[128 + (((x) & 0xff) / 2)])
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114 //#define AICA_VOL(x) (0xff - logs[x&255])
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115
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116 static inline unsigned AICA_FREQ(unsigned freq) {
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117 unsigned long freq_lo, freq_base = 5644800;
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118 int freq_hi = 7;
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119
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120 /* Need to convert frequency to floating point format
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121 (freq_hi is exponent, freq_lo is mantissa)
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122 Formula is ferq = 44100*2^freq_hi*(1+freq_lo/1024) */
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123 while (freq < freq_base && freq_hi > -8) {
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124 freq_base >>= 1;
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125 --freq_hi;
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126 }
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127 while (freq < freq_base && freq_hi > -8) {
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128 freq_base >>= 1;
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129 freq_hi--;
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130 }
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131 freq_lo = (freq<<10) / freq_base;
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132 return (freq_hi << 11) | (freq_lo & 1023);
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133 }
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134
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135 /* Sets up a sound channel completely. This is generally good if you want
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136 a quick and dirty way to play notes. If you want a more comprehensive
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137 set of routines (more like PC wavetable cards) see below.
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138
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139 ch is the channel to play on (0 - 63)
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140 smpptr is the pointer to the sound data; if you're running off the
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141 SH4, then this ought to be (ptr - 0xa0800000); otherwise it's just
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142 ptr. Basically, it's an offset into sound ram.
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143 mode is one of the mode constants (16 bit, 8 bit, ADPCM)
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144 nsamp is the number of samples to play (not number of bytes!)
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145 freq is the sampling rate of the sound
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146 vol is the volume, 0 to 0xff (0xff is louder)
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147 pan is a panning constant -- 0 is left, 128 is center, 255 is right.
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148
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149 This routine (and the similar ones) owe a lot to Marcus' sound example --
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150 I hadn't gotten quite this far into dissecting the individual regs yet. */
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151 void aica_play(int ch,int mode,unsigned long smpptr,int loopst,int loopend,int freq,int vol,int pan,int loopflag) {
1461
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152 /* int i;
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153 */
509
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154 int val;
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155 int old = 0;
509
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156
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157 /* Stop the channel (if it's already playing) */
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158 aica_stop(ch);
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159 /* doesn't seem to be needed, but it's here just in case */
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160 /*
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161 for (i=0; i<256; i++) {
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162 asm("nop");
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163 asm("nop");
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164 asm("nop");
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165 asm("nop");
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166 }
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167 */
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168 G2_LOCK(old);
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169 /* Envelope setup. The first of these is the loop point,
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170 e.g., where the sample starts over when it loops. The second
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171 is the loop end. This is the full length of the sample when
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172 you are not looping, or the loop end point when you are (though
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173 storing more than that is a waste of memory if you're not doing
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174 volume enveloping). */
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175 CHNREG32(ch, 8) = loopst & 0xffff;
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176 CHNREG32(ch, 12) = loopend & 0xffff;
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177
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178 /* Write resulting values */
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179 CHNREG32(ch, 24) = AICA_FREQ(freq);
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180
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181 /* Set volume, pan, and some other things that we don't know what
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182 they do =) */
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183 CHNREG32(ch, 36) = AICA_PAN(pan) | (0xf<<8);
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184 /* Convert the incoming volume and pan into hardware values */
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185 /* Vol starts at zero so we can ramp */
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186 vol = AICA_VOL(vol);
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187 CHNREG32(ch, 40) = 0x24 | (vol<<8);
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188 /* Convert the incoming volume and pan into hardware values */
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189 /* Vol starts at zero so we can ramp */
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190
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191 /* If we supported volume envelopes (which we don't yet) then
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192 this value would set that up. The top 4 bits determine the
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193 envelope speed. f is the fastest, 1 is the slowest, and 0
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194 seems to be an invalid value and does weird things). The
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195 default (below) sets it into normal mode (play and terminate/loop).
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196 CHNREG32(ch, 16) = 0xf010;
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197 */
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198 CHNREG32(ch, 16) = 0x1f; /* No volume envelope */
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199
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200
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201 /* Set sample format, buffer address, and looping control. If
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202 0x0200 mask is set on reg 0, the sample loops infinitely. If
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203 it's not set, the sample plays once and terminates. We'll
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204 also set the bits to start playback here. */
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205 CHNREG32(ch, 4) = smpptr & 0xffff;
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206 val = 0xc000 | 0x0000 | (mode<<7) | (smpptr >> 16);
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207 if (loopflag) val|=0x200;
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208
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209 CHNREG32(ch, 0) = val;
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210
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211 G2_UNLOCK(old);
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212
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213 /* Enable playback */
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214 /* CHNREG32(ch, 0) |= 0xc000; */
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215 g2_fifo_wait();
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216
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217 #if 0
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218 for (i=0xff; i>=vol; i--) {
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219 if ((i&7)==0) g2_fifo_wait();
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220 CHNREG32(ch, 40) = 0x24 | (i<<8);;
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221 }
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222
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223 g2_fifo_wait();
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224 #endif
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225 }
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226
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227 /* Stop the sound on a given channel */
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228 void aica_stop(int ch) {
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229 g2_write_32(CHNREGADDR(ch, 0),(g2_read_32(CHNREGADDR(ch, 0)) & ~0x4000) | 0x8000);
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230 g2_fifo_wait();
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231 }
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232
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233
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234 /* The rest of these routines can change the channel in mid-stride so you
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235 can do things like vibrato and panning effects. */
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236
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237 /* Set channel volume */
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238 void aica_vol(int ch,int vol) {
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239 // g2_write_8(CHNREGADDR(ch, 41),AICA_VOL(vol));
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240 g2_write_32(CHNREGADDR(ch, 40),(g2_read_32(CHNREGADDR(ch, 40))&0xffff00ff)|(AICA_VOL(vol)<<8) );
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241 g2_fifo_wait();
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242 }
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243
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244 /* Set channel pan */
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245 void aica_pan(int ch,int pan) {
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246 // g2_write_8(CHNREGADDR(ch, 36),AICA_PAN(pan));
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247 g2_write_32(CHNREGADDR(ch, 36),(g2_read_32(CHNREGADDR(ch, 36))&0xffffff00)|(AICA_PAN(pan)) );
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248 g2_fifo_wait();
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249 }
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250
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251 /* Set channel frequency */
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252 void aica_freq(int ch,int freq) {
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253 g2_write_32(CHNREGADDR(ch, 24),AICA_FREQ(freq));
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254 g2_fifo_wait();
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255 }
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256
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257 /* Get channel position */
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258 int aica_get_pos(int ch) {
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259 #if 1
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260 /* Observe channel ch */
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261 g2_write_32(SNDREGADDR(0x280c),(g2_read_32(SNDREGADDR(0x280c))&0xffff00ff) | (ch<<8));
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262 g2_fifo_wait();
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263 /* Update position counters */
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264 return g2_read_32(SNDREGADDR(0x2814)) & 0xffff;
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265 #else
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266 /* Observe channel ch */
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267 g2_write_8(SNDREGADDR(0x280d),ch);
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268 /* Update position counters */
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269 return g2_read_32(SNDREGADDR(0x2814)) & 0xffff;
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270 #endif
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271 }