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annotate src/audio/dc/SDL_dcaudio.c @ 1461:11134dc42da8

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Updated for Dreamcast KOS June 2005 snapshot: http://cadcdev.sourceforge.net/svn/snapshots/ http://gamedev.allusion.net/softprj/kos/dcsetup.php
author Sam Lantinga <slouken@libsdl.org>
date Thu, 02 Mar 2006 13:16:02 +0000
parents d910939febfa
children 782fd950bd46 c121d94672cb 405a192b68e7
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_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 switch(spec->format&0xff) {
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205 case 8: spec->format = AUDIO_S8; break;
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206 case 16: spec->format = AUDIO_S16LSB; break;
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207 default:
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208 SDL_SetError("Unsupported audio format");
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209 return(-1);
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210 }
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211
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212 /* Update the fragment size as size in bytes */
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213 SDL_CalculateAudioSpec(spec);
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214
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215 /* Allocate mixing buffer */
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216 this->hidden->mixlen = spec->size;
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217 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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218 if ( this->hidden->mixbuf == NULL ) {
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219 return(-1);
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220 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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221 SDL_memset(this->hidden->mixbuf, spec->silence, spec->size);
509
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222 this->hidden->leftpos = 0x11000;
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223 this->hidden->rightpos = 0x11000+spec->size;
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224 this->hidden->playing = 0;
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225 this->hidden->nextbuf = 0;
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226
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227 /* We're ready to rock and roll. :-) */
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228 return(0);
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229 }