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annotate src/audio/dc/SDL_dcaudio.c @ 2769:2a46b5912665

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Added missing math.h functionality for SDL_audiocvt.c
author Sam Lantinga <slouken@libsdl.org>
date Sun, 12 Oct 2008 16:30:42 +0000
parents 866052b01ee5
children 99210400e8b9
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21
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22 */
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23 #include "SDL_config.h"
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24
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25 /* Output dreamcast aica */
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26
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27 #include "SDL_timer.h"
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28 #include "SDL_audio.h"
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29 #include "../SDL_audiomem.h"
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30 #include "../SDL_audio_c.h"
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31 #include "SDL_dcaudio.h"
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32
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33 #include "aica.h"
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34 #include <dc/spu.h>
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35
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36 #define SPU_RAM_BASE 0xa0800000
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37
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38 static void
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39 spu_memload_stereo8(int leftpos, int rightpos, void *src0, size_t size)
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40 {
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41 uint8 *src = src0;
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42 uint32 *left = (uint32 *) (leftpos + SPU_RAM_BASE);
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43 uint32 *right = (uint32 *) (rightpos + SPU_RAM_BASE);
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44 size = (size + 7) / 8;
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45 while (size--) {
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46 unsigned lval, rval;
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47 lval = *src++;
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48 rval = *src++;
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49 lval |= (*src++) << 8;
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50 rval |= (*src++) << 8;
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51 lval |= (*src++) << 16;
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52 rval |= (*src++) << 16;
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53 lval |= (*src++) << 24;
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54 rval |= (*src++) << 24;
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55 g2_write_32(left++, lval);
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56 g2_write_32(right++, rval);
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57 g2_fifo_wait();
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58 }
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59 }
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60
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61 static void
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62 spu_memload_stereo16(int leftpos, int rightpos, void *src0, size_t size)
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63 {
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64 uint16 *src = src0;
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65 uint32 *left = (uint32 *) (leftpos + SPU_RAM_BASE);
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66 uint32 *right = (uint32 *) (rightpos + SPU_RAM_BASE);
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67 size = (size + 7) / 8;
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68 while (size--) {
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69 unsigned lval, rval;
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70 lval = *src++;
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71 rval = *src++;
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72 lval |= (*src++) << 16;
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73 rval |= (*src++) << 16;
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74 g2_write_32(left++, lval);
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75 g2_write_32(right++, rval);
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76 g2_fifo_wait();
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77 }
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78 }
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79
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80 static void
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81 DCAUD_PlayDevice(_THIS)
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82 {
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83 SDL_AudioSpec *spec = &this->spec;
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84 unsigned int offset;
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85
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86 if (this->hidden->playing) {
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87 /* wait */
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88 while (aica_get_pos(0) / spec->samples == this->hidden->nextbuf) {
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89 thd_pass();
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90 }
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91 }
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92
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93 offset = this->hidden->nextbuf * spec->size;
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94 this->hidden->nextbuf ^= 1;
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95 /* Write the audio data, checking for EAGAIN on broken audio drivers */
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96 if (spec->channels == 1) {
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97 spu_memload(this->hidden->leftpos + offset, this->hidden->mixbuf,
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98 this->hidden->mixlen);
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99 } else {
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100 offset /= 2;
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101 if ((this->spec.format & 255) == 8) {
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102 spu_memload_stereo8(this->hidden->leftpos + offset,
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103 this->hidden->rightpos + offset,
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104 this->hidden->mixbuf, this->hidden->mixlen);
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105 } else {
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106 spu_memload_stereo16(this->hidden->leftpos + offset,
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107 this->hidden->rightpos + offset,
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108 this->hidden->mixbuf, this->hidden->mixlen);
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109 }
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110 }
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111
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112 if (!this->hidden->playing) {
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113 int mode;
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114 this->hidden->playing = 1;
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115 mode = (spec->format == AUDIO_S8) ? SM_8BIT : SM_16BIT;
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116 if (spec->channels == 1) {
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117 aica_play(0, mode, this->hidden->leftpos, 0,
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118 spec->samples * 2, spec->freq, 255, 128, 1);
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119 } else {
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120 aica_play(0, mode, this->hidden->leftpos, 0,
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121 spec->samples * 2, spec->freq, 255, 0, 1);
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122 aica_play(1, mode, this->hidden->rightpos, 0,
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123 spec->samples * 2, spec->freq, 255, 255, 1);
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124 }
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125 }
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126 }
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127
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128 static Uint8 *
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129 DCAUD_GetDeviceBuf(_THIS)
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130 {
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131 return (this->hidden->mixbuf);
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132 }
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133
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134 /* This function waits until it is possible to write a full sound buffer */
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135 static void
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136 DCAUD_WaitDevice(_THIS)
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137 {
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138 if (this->hidden->playing) {
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139 /* wait */
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140 while (aica_get_pos(0) / this->spec.samples == this->hidden->nextbuf) {
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141 thd_pass();
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142 }
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143 }
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144 }
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145
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146 static void
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147 DCAUD_CloseDevice(_THIS)
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148 {
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149 if (this->hidden != NULL) {
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150 aica_stop(0);
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151 if (this->spec.channels == 2) {
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152 aica_stop(1);
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153 }
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154 if (this->hidden->mixbuf != NULL) {
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155 SDL_FreeAudioMem(this->hidden->mixbuf);
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156 this->hidden->mixbuf = NULL;
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157 }
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158 SDL_free(this->hidden);
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159 this->hidden = NULL;
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160
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161 /* !!! FIXME: is there a reverse of spu_init()? */
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162 }
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163 }
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164
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165 static int
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166 DCAUD_OpenDevice(_THIS, SDL_AudioSpec * spec)
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167 {
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168 SDL_AudioFormat test_format = SDL_FirstAudioFormat(spec->format);
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169 int valid_datatype = 0;
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170
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171 /* Initialize all variables that we clean on shutdown */
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172 this->hidden = (struct SDL_PrivateAudioData *)
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173 SDL_malloc((sizeof *this->hidden));
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174 if (this->hidden == NULL) {
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175 SDL_OutOfMemory();
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176 return 0;
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177 }
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178 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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179
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180 spu_init();
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181
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182 while ((!valid_datatype) && (test_format)) {
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183 spec->format = test_format;
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184 switch (test_format) {
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185 /* only formats Dreamcast accepts... */
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186 case AUDIO_S8:
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187 case AUDIO_S16LSB:
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188 valid_datatype = 1;
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189 break;
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190
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191 default:
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192 test_format = SDL_NextAudioFormat();
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193 break;
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194 }
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195 }
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196
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197 if (!valid_datatype) { /* shouldn't happen, but just in case... */
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198 DCAUD_CloseDevice(this);
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199 SDL_SetError("Unsupported audio format");
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200 return 0;
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201 }
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202
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203 if (spec->channels > 2)
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204 spec->channels = 2; /* no more than stereo on the Dreamcast. */
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205
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206 /* Update the fragment size as size in bytes */
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207 SDL_CalculateAudioSpec(spec);
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208
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209 /* Allocate mixing buffer */
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210 this->hidden->mixlen = spec->size;
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211 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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212 if (this->hidden->mixbuf == NULL) {
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213 DCAUD_CloseDevice(this);
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214 SDL_OutOfMemory();
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215 return 0;
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216 }
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217 SDL_memset(this->hidden->mixbuf, spec->silence, spec->size);
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218 this->hidden->leftpos = 0x11000;
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219 this->hidden->rightpos = 0x11000 + spec->size;
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220 this->hidden->playing = 0;
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221 this->hidden->nextbuf = 0;
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222
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223 /* We're ready to rock and roll. :-) */
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224 return 1;
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225 }
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226
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227 static int
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228 DCAUD_Init(SDL_AudioDriverImpl * impl)
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229 {
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230 /* Set the function pointers */
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231 impl->OpenDevice = DCAUD_OpenDevice;
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232 impl->PlayDevice = DCAUD_PlayDevice;
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233 impl->WaitDevice = DCAUD_WaitDevice;
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234 impl->GetDeviceBuf = DCAUD_GetDeviceBuf;
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235 impl->CloseDevice = DCAUD_CloseDevice;
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236 impl->OnlyHasDefaultOutputDevice = 1;
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237
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238 return 1;
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239 }
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240
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241 AudioBootStrap DCAUD_bootstrap = {
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242 "dcaudio", "Dreamcast AICA audio", DCAUD_Init, 0
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243 };
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244
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245 /* vi: set ts=4 sw=4 expandtab: */