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annotate src/audio/dc/SDL_dcaudio.c @ 803:355632dca928

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Updated SDL HTML documentation
author Sam Lantinga <slouken@libsdl.org>
date Tue, 10 Feb 2004 15:15:40 +0000
parents b8d311d90021
children c9b51268668f
rev   line source
509
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1 /*
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2 SDL - Simple DirectMedia Layer
769
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3 Copyright (C) 1997-2004 Sam Lantinga
509
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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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 BERO <bero@geocities.co.jp>
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20 based on SDL_diskaudio.c by Sam Lantinga <slouken@libsdl.org>
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21
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22 */
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23
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24 #ifdef SAVE_RCSID
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25 static char rcsid =
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26 "@(#) $Id$";
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27 #endif
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28
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29 /* Output dreamcast aica */
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30
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31 #include <stdlib.h>
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32 #include <stdio.h>
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33 #include <string.h>
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34 #include <errno.h>
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35 #include <unistd.h>
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36 #include <sys/stat.h>
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37 #include <sys/types.h>
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38 #include <sys/stat.h>
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39 #include <fcntl.h>
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40
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41
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42 #include "SDL_audio.h"
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43 #include "SDL_error.h"
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44 #include "SDL_audiomem.h"
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45 #include "SDL_audio_c.h"
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46 #include "SDL_timer.h"
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47 #include "SDL_audiodev_c.h"
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48 #include "SDL_dcaudio.h"
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49
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50 #include "aica.h"
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51 #include <dc/spu.h>
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52
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53 /* Audio driver functions */
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54 static int DCAUD_OpenAudio(_THIS, SDL_AudioSpec *spec);
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55 static void DCAUD_WaitAudio(_THIS);
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56 static void DCAUD_PlayAudio(_THIS);
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57 static Uint8 *DCAUD_GetAudioBuf(_THIS);
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58 static void DCAUD_CloseAudio(_THIS);
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59
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60 /* Audio driver bootstrap functions */
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61 static int DCAUD_Available(void)
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62 {
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63 return 1;
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64 }
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65
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66 static void DCAUD_DeleteDevice(SDL_AudioDevice *device)
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67 {
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68 free(device->hidden);
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69 free(device);
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70 }
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71
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72 static SDL_AudioDevice *DCAUD_CreateDevice(int devindex)
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73 {
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74 SDL_AudioDevice *this;
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75
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76 /* Initialize all variables that we clean on shutdown */
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77 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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78 if ( this ) {
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79 memset(this, 0, (sizeof *this));
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80 this->hidden = (struct SDL_PrivateAudioData *)
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81 malloc((sizeof *this->hidden));
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82 }
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83 if ( (this == NULL) || (this->hidden == NULL) ) {
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84 SDL_OutOfMemory();
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85 if ( this ) {
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86 free(this);
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87 }
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88 return(0);
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89 }
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90 memset(this->hidden, 0, (sizeof *this->hidden));
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91
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92 /* Set the function pointers */
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93 this->OpenAudio = DCAUD_OpenAudio;
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94 this->WaitAudio = DCAUD_WaitAudio;
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95 this->PlayAudio = DCAUD_PlayAudio;
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96 this->GetAudioBuf = DCAUD_GetAudioBuf;
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97 this->CloseAudio = DCAUD_CloseAudio;
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98
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99 this->free = DCAUD_DeleteDevice;
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100
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101 spu_init();
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102
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103 return this;
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104 }
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105
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106 AudioBootStrap DCAUD_bootstrap = {
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107 "dcaudio", "Dreamcast AICA audio",
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108 DCAUD_Available, DCAUD_CreateDevice
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109 };
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110
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111 /* This function waits until it is possible to write a full sound buffer */
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112 static void DCAUD_WaitAudio(_THIS)
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113 {
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114 if (this->hidden->playing) {
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115 /* wait */
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116 while(aica_get_pos(0)/this->spec.samples == this->hidden->nextbuf) {
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117 thd_pass();
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118 }
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119 }
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120 }
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121
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122 #define SPU_RAM_BASE 0xa0800000
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123
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124 static void spu_memload_stereo8(int leftpos,int rightpos,void *src0,size_t size)
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125 {
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126 uint8 *src = src0;
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127 uint32 *left = (uint32*)(leftpos +SPU_RAM_BASE);
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128 uint32 *right = (uint32*)(rightpos+SPU_RAM_BASE);
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129 size = (size+7)/8;
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130 while(size--) {
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131 unsigned lval,rval;
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132 lval = *src++;
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133 rval = *src++;
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134 lval|= (*src++)<<8;
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135 rval|= (*src++)<<8;
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136 lval|= (*src++)<<16;
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137 rval|= (*src++)<<16;
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138 lval|= (*src++)<<24;
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139 rval|= (*src++)<<24;
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140 g2_write_32(left++,lval);
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141 g2_write_32(right++,rval);
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142 g2_fifo_wait();
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143 }
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144 }
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145
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146 static void spu_memload_stereo16(int leftpos,int rightpos,void *src0,size_t size)
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147 {
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148 uint16 *src = src0;
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149 uint32 *left = (uint32*)(leftpos +SPU_RAM_BASE);
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150 uint32 *right = (uint32*)(rightpos+SPU_RAM_BASE);
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151 size = (size+7)/8;
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152 while(size--) {
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153 unsigned lval,rval;
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154 lval = *src++;
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155 rval = *src++;
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156 lval|= (*src++)<<16;
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157 rval|= (*src++)<<16;
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158 g2_write_32(left++,lval);
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159 g2_write_32(right++,rval);
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160 g2_fifo_wait();
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161 }
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162 }
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163
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164 static void DCAUD_PlayAudio(_THIS)
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165 {
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166 SDL_AudioSpec *spec = &this->spec;
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167 unsigned int offset;
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168
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169 if (this->hidden->playing) {
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170 /* wait */
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171 while(aica_get_pos(0)/spec->samples == this->hidden->nextbuf) {
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172 thd_pass();
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173 }
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174 }
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175
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176 offset = this->hidden->nextbuf*spec->size;
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177 this->hidden->nextbuf^=1;
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178 /* Write the audio data, checking for EAGAIN on broken audio drivers */
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179 if (spec->channels==1) {
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180 spu_memload(this->hidden->leftpos+offset,this->hidden->mixbuf,this->hidden->mixlen);
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181 } else {
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182 offset/=2;
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183 if ((this->spec.format&255)==8) {
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184 spu_memload_stereo8(this->hidden->leftpos+offset,this->hidden->rightpos+offset,this->hidden->mixbuf,this->hidden->mixlen);
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185 } else {
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186 spu_memload_stereo16(this->hidden->leftpos+offset,this->hidden->rightpos+offset,this->hidden->mixbuf,this->hidden->mixlen);
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187 }
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188 }
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189
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190 if (!this->hidden->playing) {
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191 int mode;
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192 this->hidden->playing = 1;
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193 mode = (spec->format==AUDIO_S8)?SM_8BIT:SM_16BIT;
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194 if (spec->channels==1) {
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195 aica_play(0,mode,this->hidden->leftpos,0,spec->samples*2,spec->freq,255,128,1);
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196 } else {
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197 aica_play(0,mode,this->hidden->leftpos ,0,spec->samples*2,spec->freq,255,0,1);
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198 aica_play(1,mode,this->hidden->rightpos,0,spec->samples*2,spec->freq,255,255,1);
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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 static Uint8 *DCAUD_GetAudioBuf(_THIS)
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204 {
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205 return(this->hidden->mixbuf);
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206 }
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207
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208 static void DCAUD_CloseAudio(_THIS)
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209 {
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210 aica_stop(0);
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211 if (this->spec.channels==2) aica_stop(1);
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212 if ( this->hidden->mixbuf != NULL ) {
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213 SDL_FreeAudioMem(this->hidden->mixbuf);
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214 this->hidden->mixbuf = NULL;
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215 }
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216 }
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217
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218 static int DCAUD_OpenAudio(_THIS, SDL_AudioSpec *spec)
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219 {
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220 switch(spec->format&0xff) {
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221 case 8: spec->format = AUDIO_S8; break;
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222 case 16: spec->format = AUDIO_S16LSB; break;
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223 default:
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224 SDL_SetError("Unsupported audio format");
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225 return(-1);
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226 }
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227
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228 /* Update the fragment size as size in bytes */
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229 SDL_CalculateAudioSpec(spec);
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230
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231 /* Allocate mixing buffer */
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232 this->hidden->mixlen = spec->size;
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233 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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234 if ( this->hidden->mixbuf == NULL ) {
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235 return(-1);
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236 }
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237 memset(this->hidden->mixbuf, spec->silence, spec->size);
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238 this->hidden->leftpos = 0x11000;
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239 this->hidden->rightpos = 0x11000+spec->size;
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240 this->hidden->playing = 0;
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241 this->hidden->nextbuf = 0;
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242
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243 /* We're ready to rock and roll. :-) */
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244 return(0);
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245 }