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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_audiodev_c.h" |
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32 #include "SDL_dcaudio.h" |
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33 |
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34 #include "aica.h" |
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35 #include <dc/spu.h> |
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36 |
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37 /* Audio driver functions */ |
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38 static int DCAUD_OpenAudio(_THIS, SDL_AudioSpec *spec); |
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39 static void DCAUD_WaitAudio(_THIS); |
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40 static void DCAUD_PlayAudio(_THIS); |
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41 static Uint8 *DCAUD_GetAudioBuf(_THIS); |
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42 static void DCAUD_CloseAudio(_THIS); |
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43 |
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44 /* Audio driver bootstrap functions */ |
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45 static int DCAUD_Available(void) |
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46 { |
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47 return 1; |
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48 } |
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49 |
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50 static void DCAUD_DeleteDevice(SDL_AudioDevice *device) |
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51 { |
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52 SDL_free(device->hidden); |
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53 SDL_free(device); |
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54 } |
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55 |
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56 static SDL_AudioDevice *DCAUD_CreateDevice(int devindex) |
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57 { |
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58 SDL_AudioDevice *this; |
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59 |
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60 /* Initialize all variables that we clean on shutdown */ |
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61 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
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62 if ( this ) { |
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63 SDL_memset(this, 0, (sizeof *this)); |
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64 this->hidden = (struct SDL_PrivateAudioData *) |
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65 SDL_malloc((sizeof *this->hidden)); |
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66 } |
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67 if ( (this == NULL) || (this->hidden == NULL) ) { |
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68 SDL_OutOfMemory(); |
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69 if ( this ) { |
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70 SDL_free(this); |
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71 } |
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72 return(0); |
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73 } |
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74 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
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75 |
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76 /* Set the function pointers */ |
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77 this->OpenAudio = DCAUD_OpenAudio; |
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78 this->WaitAudio = DCAUD_WaitAudio; |
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79 this->PlayAudio = DCAUD_PlayAudio; |
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80 this->GetAudioBuf = DCAUD_GetAudioBuf; |
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81 this->CloseAudio = DCAUD_CloseAudio; |
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82 |
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83 this->free = DCAUD_DeleteDevice; |
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84 |
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85 spu_init(); |
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86 |
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87 return this; |
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88 } |
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89 |
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90 AudioBootStrap DCAUD_bootstrap = { |
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91 "dcaudio", "Dreamcast AICA audio", |
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92 DCAUD_Available, DCAUD_CreateDevice |
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93 }; |
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94 |
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95 /* This function waits until it is possible to write a full sound buffer */ |
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96 static void DCAUD_WaitAudio(_THIS) |
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97 { |
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98 if (this->hidden->playing) { |
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99 /* wait */ |
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100 while(aica_get_pos(0)/this->spec.samples == this->hidden->nextbuf) { |
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101 thd_pass(); |
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102 } |
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103 } |
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104 } |
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105 |
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106 #define SPU_RAM_BASE 0xa0800000 |
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107 |
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108 static void spu_memload_stereo8(int leftpos,int rightpos,void *src0,size_t size) |
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109 { |
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110 uint8 *src = src0; |
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111 uint32 *left = (uint32*)(leftpos +SPU_RAM_BASE); |
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112 uint32 *right = (uint32*)(rightpos+SPU_RAM_BASE); |
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113 size = (size+7)/8; |
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114 while(size--) { |
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115 unsigned lval,rval; |
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116 lval = *src++; |
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117 rval = *src++; |
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118 lval|= (*src++)<<8; |
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119 rval|= (*src++)<<8; |
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120 lval|= (*src++)<<16; |
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121 rval|= (*src++)<<16; |
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122 lval|= (*src++)<<24; |
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123 rval|= (*src++)<<24; |
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124 g2_write_32(left++,lval); |
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125 g2_write_32(right++,rval); |
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126 g2_fifo_wait(); |
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127 } |
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128 } |
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129 |
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130 static void spu_memload_stereo16(int leftpos,int rightpos,void *src0,size_t size) |
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131 { |
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132 uint16 *src = src0; |
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133 uint32 *left = (uint32*)(leftpos +SPU_RAM_BASE); |
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134 uint32 *right = (uint32*)(rightpos+SPU_RAM_BASE); |
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135 size = (size+7)/8; |
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136 while(size--) { |
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137 unsigned lval,rval; |
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138 lval = *src++; |
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139 rval = *src++; |
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140 lval|= (*src++)<<16; |
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141 rval|= (*src++)<<16; |
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142 g2_write_32(left++,lval); |
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143 g2_write_32(right++,rval); |
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144 g2_fifo_wait(); |
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145 } |
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146 } |
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147 |
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148 static void DCAUD_PlayAudio(_THIS) |
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149 { |
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150 SDL_AudioSpec *spec = &this->spec; |
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151 unsigned int offset; |
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152 |
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153 if (this->hidden->playing) { |
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154 /* wait */ |
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155 while(aica_get_pos(0)/spec->samples == this->hidden->nextbuf) { |
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156 thd_pass(); |
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157 } |
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158 } |
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159 |
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160 offset = this->hidden->nextbuf*spec->size; |
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161 this->hidden->nextbuf^=1; |
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162 /* Write the audio data, checking for EAGAIN on broken audio drivers */ |
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163 if (spec->channels==1) { |
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164 spu_memload(this->hidden->leftpos+offset,this->hidden->mixbuf,this->hidden->mixlen); |
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165 } else { |
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166 offset/=2; |
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167 if ((this->spec.format&255)==8) { |
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168 spu_memload_stereo8(this->hidden->leftpos+offset,this->hidden->rightpos+offset,this->hidden->mixbuf,this->hidden->mixlen); |
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169 } else { |
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170 spu_memload_stereo16(this->hidden->leftpos+offset,this->hidden->rightpos+offset,this->hidden->mixbuf,this->hidden->mixlen); |
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171 } |
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172 } |
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173 |
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174 if (!this->hidden->playing) { |
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175 int mode; |
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176 this->hidden->playing = 1; |
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177 mode = (spec->format==AUDIO_S8)?SM_8BIT:SM_16BIT; |
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178 if (spec->channels==1) { |
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179 aica_play(0,mode,this->hidden->leftpos,0,spec->samples*2,spec->freq,255,128,1); |
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180 } else { |
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181 aica_play(0,mode,this->hidden->leftpos ,0,spec->samples*2,spec->freq,255,0,1); |
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182 aica_play(1,mode,this->hidden->rightpos,0,spec->samples*2,spec->freq,255,255,1); |
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183 } |
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184 } |
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185 } |
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186 |
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187 static Uint8 *DCAUD_GetAudioBuf(_THIS) |
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188 { |
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189 return(this->hidden->mixbuf); |
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190 } |
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191 |
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192 static void DCAUD_CloseAudio(_THIS) |
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193 { |
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194 aica_stop(0); |
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195 if (this->spec.channels==2) aica_stop(1); |
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196 if ( this->hidden->mixbuf != NULL ) { |
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197 SDL_FreeAudioMem(this->hidden->mixbuf); |
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198 this->hidden->mixbuf = NULL; |
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199 } |
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200 } |
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201 |
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202 static int DCAUD_OpenAudio(_THIS, SDL_AudioSpec *spec) |
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203 { |
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204 Uint16 test_format = SDL_FirstAudioFormat(spec->format); |
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205 int valid_datatype = 0; |
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206 while ((!valid_datatype) && (test_format)) { |
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207 spec->format = test_format; |
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208 switch (test_format) { |
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209 /* only formats Dreamcast accepts... */ |
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210 case AUDIO_S8: |
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211 case AUDIO_S16LSB: |
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212 valid_datatype = 1; |
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213 break; |
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214 |
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215 default: |
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216 test_format = SDL_NextAudioFormat(); |
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217 break; |
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218 } |
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219 } |
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220 |
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221 if (!valid_datatype) { /* shouldn't happen, but just in case... */ |
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222 SDL_SetError("Unsupported audio format"); |
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223 return (-1); |
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224 } |
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225 |
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226 if (spec->channels > 2) |
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227 spec->channels = 2; /* no more than stereo on the Dreamcast. */ |
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228 |
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229 /* Update the fragment size as size in bytes */ |
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230 SDL_CalculateAudioSpec(spec); |
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231 |
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232 /* Allocate mixing buffer */ |
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233 this->hidden->mixlen = spec->size; |
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234 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen); |
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235 if ( this->hidden->mixbuf == NULL ) { |
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236 return(-1); |
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237 } |
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238 SDL_memset(this->hidden->mixbuf, spec->silence, spec->size); |
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239 this->hidden->leftpos = 0x11000; |
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240 this->hidden->rightpos = 0x11000+spec->size; |
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241 this->hidden->playing = 0; |
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242 this->hidden->nextbuf = 0; |
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243 |
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244 /* We're ready to rock and roll. :-) */ |
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245 return(0); |
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246 } |