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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 #include "SDL_config.h" |
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23 |
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24 /* Allow access to a raw mixing buffer */ |
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25 #include <nds.h> |
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26 #include "SDL.h" |
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27 #include "SDL_endian.h" |
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28 #include "SDL_timer.h" |
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29 #include "SDL_audio.h" |
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30 #include "../SDL_audiomem.h" |
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31 #include "../SDL_audio_c.h" |
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32 #include "SDL_ndsaudio.h" |
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33 #include "soundcommon.h" |
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34 |
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35 |
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36 /* Audio driver functions */ |
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37 static int NDS_OpenAudio(_THIS, SDL_AudioSpec *spec); |
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38 static void NDS_WaitAudio(_THIS); |
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39 static void NDS_PlayAudio(_THIS); |
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40 static Uint8 *NDS_GetAudioBuf(_THIS); |
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41 static void NDS_CloseAudio(_THIS); |
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42 |
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43 /* Audio driver bootstrap functions */ |
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44 |
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45 u32 framecounter = 0,soundoffset = 0; |
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46 static SDL_AudioDevice *sdl_nds_audiodevice; |
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47 |
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48 //void SoundMixCallback(void *stream,u32 size) |
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49 //{ |
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50 // //printf("SoundMixCallback\n"); |
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51 // |
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52 // Uint8 *buffer; |
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53 // |
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54 // buffer = sdl_nds_audiodevice->hidden->mixbuf; |
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55 // memset(buffer, sdl_nds_audiodevice->spec.silence, size); |
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56 // |
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57 // if (!sdl_nds_audiodevice->paused){ |
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58 // |
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59 // |
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60 // //if (sdl_nds_audiodevice->convert.needed) { |
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61 // // int silence; |
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62 // |
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63 // // if (sdl_nds_audiodevice->convert.src_format == AUDIO_U8 ) { |
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64 // // silence = 0x80; |
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65 // // } else { |
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66 // // silence = 0; |
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67 // // } |
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68 // // memset(sdl_nds_audiodevice->convert.buf, silence, sdl_nds_audiodevice->convert.len); |
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69 // // sdl_nds_audiodevice->spec.callback(sdl_nds_audiodevice->spec.userdata, |
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70 // // (Uint8 *)sdl_nds_audiodevice->convert.buf,sdl_nds_audiodevice->convert.len); |
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71 // // SDL_ConvertAudio(&sdl_nds_audiodevice->convert); |
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72 // // memcpy(buffer, sdl_nds_audiodevice->convert.buf, sdl_nds_audiodevice->convert.len_cvt); |
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73 // //} else |
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74 // { |
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75 // sdl_nds_audiodevice->spec.callback(sdl_nds_audiodevice->spec.userdata, buffer, size); |
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76 // //memcpy((Sint16 *)stream,buffer, size); |
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77 // } |
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78 // |
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79 // } |
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80 // |
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81 // if(soundsystem->format == 8) |
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82 // { |
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83 // int i; |
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84 // s32 *buffer32 = (s32 *)buffer; |
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85 // s32 *stream32 = (s32 *)stream; |
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86 // for(i=0;i<size/4;i++){ *stream32++ = buffer32[i] ^ 0x80808080;} |
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87 // //for(i = 0; i < size; i++) |
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88 // // ((s8*)stream)[i]=(buffer[i]^0x80); |
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89 // } |
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90 // else |
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91 // { |
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92 // int i; |
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93 // for(i = 0; i < size; i++){ |
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94 // //((short*)stream)[i] =(short)buffer[i] << 8; // sound 8bit ---> buffer 16bit |
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95 // //if (buffer[i] &0x80) |
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96 // //((Sint16*)stream)[i] = 0xff00 | buffer[i]; |
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97 // ((Sint16*)stream)[i] = (buffer[i] - 128) << 8; |
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98 // |
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99 // //else |
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100 // // ((Sint16*)stream)[i] = buffer[i]; |
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101 // } |
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102 // //register signed char *pSrc =buffer; |
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103 // //register short *pDest =stream; |
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104 // //int x; |
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105 // // for (x=size; x>0; x--) |
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106 // // { |
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107 // // register short temp = (((short)*pSrc)-128)<<8; |
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108 // // pSrc++; |
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109 // // *pDest++ = temp; |
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110 // // } |
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111 // |
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112 // //memcpy((Sint16 *)stream,buffer, size); |
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113 // } |
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114 //} |
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115 |
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116 void SoundMixCallback(void *stream,u32 len) |
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117 { |
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118 SDL_AudioDevice *audio = (SDL_AudioDevice *)sdl_nds_audiodevice; |
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119 |
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120 /* Silence the buffer, since it's ours */ |
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121 SDL_memset(stream, audio->spec.silence, len); |
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122 |
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123 /* Only do soemthing if audio is enabled */ |
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124 if ( ! audio->enabled ) |
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125 return; |
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126 |
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127 if ( ! audio->paused ) { |
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128 if ( audio->convert.needed ) { |
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129 //fprintf(stderr,"converting audio\n"); |
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130 SDL_mutexP(audio->mixer_lock); |
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131 (*audio->spec.callback)(audio->spec.userdata, |
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132 (Uint8 *)audio->convert.buf,audio->convert.len); |
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133 SDL_mutexV(audio->mixer_lock); |
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134 SDL_ConvertAudio(&audio->convert); |
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135 SDL_memcpy(stream,audio->convert.buf,audio->convert.len_cvt); |
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136 } else { |
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137 SDL_mutexP(audio->mixer_lock); |
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138 (*audio->spec.callback)(audio->spec.userdata, |
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139 (Uint8 *)stream, len); |
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140 SDL_mutexV(audio->mixer_lock); |
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141 } |
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142 } |
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143 return; |
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144 } |
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145 void MixSound(void) |
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146 { |
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147 int remain; |
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148 |
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149 if(soundsystem->format == 8) |
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150 { |
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151 if((soundsystem->soundcursor + soundsystem->numsamples) > soundsystem->buffersize) |
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152 { |
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153 SoundMixCallback(&soundsystem->mixbuffer[soundsystem->soundcursor],soundsystem->buffersize - soundsystem->soundcursor); |
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154 remain = soundsystem->numsamples - (soundsystem->buffersize - soundsystem->soundcursor); |
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155 SoundMixCallback(soundsystem->mixbuffer,remain); |
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156 } |
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157 else |
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158 { |
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159 SoundMixCallback(&soundsystem->mixbuffer[soundsystem->soundcursor],soundsystem->numsamples); |
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160 } |
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161 } |
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162 else |
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163 { |
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164 if((soundsystem->soundcursor + soundsystem->numsamples) > (soundsystem->buffersize >> 1)) |
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165 { |
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166 SoundMixCallback(&soundsystem->mixbuffer[soundsystem->soundcursor << 1],(soundsystem->buffersize >> 1) - soundsystem->soundcursor); |
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167 remain = soundsystem->numsamples - ((soundsystem->buffersize >> 1) - soundsystem->soundcursor); |
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168 SoundMixCallback(soundsystem->mixbuffer,remain); |
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169 } |
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170 else |
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171 { |
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172 SoundMixCallback(&soundsystem->mixbuffer[soundsystem->soundcursor << 1],soundsystem->numsamples); |
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173 } |
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174 } |
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175 } |
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176 |
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177 void InterruptHandler(void) |
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178 { |
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179 framecounter++; |
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180 } |
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181 void FiFoHandler(void) |
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182 { |
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183 u32 command; |
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184 while ( !(REG_IPC_FIFO_CR & (IPC_FIFO_RECV_EMPTY)) ) |
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185 { |
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186 command = REG_IPC_FIFO_RX; |
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187 |
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188 switch(command) |
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189 { |
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190 case FIFO_NONE: |
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191 break; |
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192 case UPDATEON_ARM9: |
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193 REG_IME = 0; |
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194 MixSound(); |
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195 REG_IME = 1; |
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196 SendCommandToArm7(MIXCOMPLETE_ONARM9); |
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197 break; |
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198 } |
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199 } |
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200 } |
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201 |
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202 |
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203 |
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204 |
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205 |
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206 static int Audio_Available(void) |
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207 { |
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208 return(1); |
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209 } |
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210 |
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211 static void Audio_DeleteDevice(SDL_AudioDevice *device) |
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212 { |
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213 } |
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214 |
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215 static SDL_AudioDevice *Audio_CreateDevice(int devindex) |
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216 { |
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217 |
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218 SDL_AudioDevice *this; |
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219 |
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220 /* Initialize all variables that we clean on shutdown */ |
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221 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); |
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222 if ( this ) { |
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223 SDL_memset(this, 0, (sizeof *this)); |
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224 this->hidden = (struct SDL_PrivateAudioData *) |
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225 SDL_malloc((sizeof *this->hidden)); |
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226 } |
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227 if ( (this == NULL) || (this->hidden == NULL) ) { |
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228 SDL_OutOfMemory(); |
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229 if ( this ) { |
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230 SDL_free(this); |
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231 } |
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232 return(0); |
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233 } |
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234 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
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235 |
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236 /* Set the function pointers */ |
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237 this->OpenAudio = NDS_OpenAudio; |
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238 this->WaitAudio = NDS_WaitAudio; |
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239 this->PlayAudio = NDS_PlayAudio; |
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240 this->GetAudioBuf = NDS_GetAudioBuf; |
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241 this->CloseAudio = NDS_CloseAudio; |
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242 |
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243 this->free = Audio_DeleteDevice; |
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244 //fprintf(stderr,"Audio_CreateDevice\n"); |
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245 return this; |
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246 } |
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247 |
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248 AudioBootStrap NDSAUD_bootstrap = { |
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249 "nds", "NDS audio", |
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250 Audio_Available, Audio_CreateDevice |
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251 }; |
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252 |
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253 |
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254 void static NDS_WaitAudio(_THIS) |
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255 { |
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256 //printf("NDS_WaitAudio\n"); |
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257 } |
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258 |
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259 static void NDS_PlayAudio(_THIS) |
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260 { |
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261 //printf("playing audio\n"); |
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262 if (this->paused) |
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263 return; |
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264 |
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265 } |
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266 |
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267 static Uint8 *NDS_GetAudioBuf(_THIS) |
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268 { |
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269 return NULL;//(this->hidden->mixbuf); |
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270 } |
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271 |
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272 static void NDS_CloseAudio(_THIS) |
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273 { |
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274 /* if ( this->hidden->mixbuf != NULL ) { |
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275 SDL_FreeAudioMem(this->hidden->mixbuf); |
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276 this->hidden->mixbuf = NULL; |
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277 }*/ |
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278 } |
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279 |
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280 static int NDS_OpenAudio(_THIS, SDL_AudioSpec *spec) |
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281 { |
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282 //printf("NDS_OpenAudio\n"); |
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283 int format = 0; |
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284 //switch(spec->format&0xff) { |
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285 //case 8: spec->format = AUDIO_S8;format=8; break; |
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286 //case 16: spec->format = AUDIO_S16LSB;format=16; break; |
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287 //default: |
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288 // SDL_SetError("Unsupported audio format"); |
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289 // return(-1); |
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290 //} |
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291 switch (spec->format&~0x1000) { |
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292 case AUDIO_S8: |
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293 /* Signed 8-bit audio supported */ |
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294 format=8; |
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295 break; |
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296 case AUDIO_U8: |
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297 spec->format ^= 0x80;format=8; |
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298 break; |
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299 case AUDIO_U16: |
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300 /* Unsigned 16-bit audio unsupported, convert to S16 */ |
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301 spec->format ^=0x8000;format=16; |
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302 case AUDIO_S16: |
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303 /* Signed 16-bit audio supported */ |
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304 format=16; |
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305 break; |
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306 } |
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307 /* Update the fragment size as size in bytes */ |
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308 SDL_CalculateAudioSpec(spec); |
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309 |
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310 /* Allocate mixing buffer */ |
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311 //this->hidden->mixlen = spec->size; |
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312 //this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen); |
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313 //if ( this->hidden->mixbuf == NULL ) { |
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314 // SDL_SetError("Out of Memory"); |
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315 // return(-1); |
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316 //} |
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317 |
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318 SDL_NDSAudio_mutex = 0; |
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319 sdl_nds_audiodevice=this; |
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320 |
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321 irqInit(); |
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322 irqSet(IRQ_VBLANK,&InterruptHandler); |
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323 irqSet(IRQ_FIFO_NOT_EMPTY,&FiFoHandler); |
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324 irqEnable(IRQ_FIFO_NOT_EMPTY); |
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325 |
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326 REG_IPC_FIFO_CR = IPC_FIFO_ENABLE | IPC_FIFO_SEND_CLEAR | IPC_FIFO_RECV_IRQ; |
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327 |
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328 |
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329 |
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330 SoundSystemInit(spec->freq,spec->size,0,format); |
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331 SoundStartMixer(); |
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332 |
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333 |
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334 return(1); |
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335 } |