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annotate src/audio/dc/SDL_dcaudio.c @ 1682:7ae8018b2e5d SDL-1.3

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Default palette entries to white, instead of black. More palettized video mode support...
author Sam Lantinga <slouken@libsdl.org>
date Fri, 16 Jun 2006 06:00:31 +0000
parents 4da1ee79c9af
children
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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
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46 DCAUD_Available(void)
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47 {
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48 return 1;
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49 }
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50
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51 static void
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52 DCAUD_DeleteDevice(SDL_AudioDevice * device)
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53 {
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54 SDL_free(device->hidden);
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55 SDL_free(device);
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56 }
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57
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58 static SDL_AudioDevice *
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59 DCAUD_CreateDevice(int devindex)
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60 {
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61 SDL_AudioDevice *this;
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62
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63 /* Initialize all variables that we clean on shutdown */
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64 this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
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65 if (this) {
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66 SDL_memset(this, 0, (sizeof *this));
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67 this->hidden = (struct SDL_PrivateAudioData *)
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68 SDL_malloc((sizeof *this->hidden));
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69 }
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70 if ((this == NULL) || (this->hidden == NULL)) {
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71 SDL_OutOfMemory();
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72 if (this) {
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73 SDL_free(this);
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74 }
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75 return (0);
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76 }
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77 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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78
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79 /* Set the function pointers */
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80 this->OpenAudio = DCAUD_OpenAudio;
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81 this->WaitAudio = DCAUD_WaitAudio;
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82 this->PlayAudio = DCAUD_PlayAudio;
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83 this->GetAudioBuf = DCAUD_GetAudioBuf;
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84 this->CloseAudio = DCAUD_CloseAudio;
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85
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86 this->free = DCAUD_DeleteDevice;
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87
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88 spu_init();
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89
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90 return this;
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91 }
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92
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93 AudioBootStrap DCAUD_bootstrap = {
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94 "dcaudio", "Dreamcast AICA audio",
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95 DCAUD_Available, DCAUD_CreateDevice
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96 };
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97
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98 /* This function waits until it is possible to write a full sound buffer */
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99 static void
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100 DCAUD_WaitAudio(_THIS)
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101 {
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102 if (this->hidden->playing) {
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103 /* wait */
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104 while (aica_get_pos(0) / this->spec.samples == this->hidden->nextbuf) {
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105 thd_pass();
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106 }
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107 }
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108 }
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109
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110 #define SPU_RAM_BASE 0xa0800000
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111
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112 static void
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113 spu_memload_stereo8(int leftpos, int rightpos, void *src0, size_t size)
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114 {
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115 uint8 *src = src0;
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116 uint32 *left = (uint32 *) (leftpos + SPU_RAM_BASE);
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117 uint32 *right = (uint32 *) (rightpos + SPU_RAM_BASE);
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118 size = (size + 7) / 8;
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119 while (size--) {
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120 unsigned lval, rval;
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121 lval = *src++;
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122 rval = *src++;
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123 lval |= (*src++) << 8;
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124 rval |= (*src++) << 8;
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125 lval |= (*src++) << 16;
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126 rval |= (*src++) << 16;
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127 lval |= (*src++) << 24;
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128 rval |= (*src++) << 24;
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129 g2_write_32(left++, lval);
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130 g2_write_32(right++, rval);
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131 g2_fifo_wait();
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132 }
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133 }
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134
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135 static void
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136 spu_memload_stereo16(int leftpos, int rightpos, void *src0, size_t size)
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137 {
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138 uint16 *src = src0;
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139 uint32 *left = (uint32 *) (leftpos + SPU_RAM_BASE);
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140 uint32 *right = (uint32 *) (rightpos + SPU_RAM_BASE);
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141 size = (size + 7) / 8;
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142 while (size--) {
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143 unsigned lval, rval;
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144 lval = *src++;
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145 rval = *src++;
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146 lval |= (*src++) << 16;
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147 rval |= (*src++) << 16;
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148 g2_write_32(left++, lval);
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149 g2_write_32(right++, rval);
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150 g2_fifo_wait();
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151 }
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152 }
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153
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154 static void
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155 DCAUD_PlayAudio(_THIS)
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156 {
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157 SDL_AudioSpec *spec = &this->spec;
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158 unsigned int offset;
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159
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160 if (this->hidden->playing) {
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161 /* wait */
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162 while (aica_get_pos(0) / spec->samples == this->hidden->nextbuf) {
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163 thd_pass();
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164 }
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165 }
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166
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167 offset = this->hidden->nextbuf * spec->size;
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168 this->hidden->nextbuf ^= 1;
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169 /* Write the audio data, checking for EAGAIN on broken audio drivers */
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170 if (spec->channels == 1) {
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171 spu_memload(this->hidden->leftpos + offset, this->hidden->mixbuf,
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172 this->hidden->mixlen);
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173 } else {
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174 offset /= 2;
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175 if ((this->spec.format & 255) == 8) {
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176 spu_memload_stereo8(this->hidden->leftpos + offset,
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177 this->hidden->rightpos + offset,
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178 this->hidden->mixbuf, this->hidden->mixlen);
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179 } else {
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180 spu_memload_stereo16(this->hidden->leftpos + offset,
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181 this->hidden->rightpos + offset,
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182 this->hidden->mixbuf, this->hidden->mixlen);
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183 }
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184 }
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185
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186 if (!this->hidden->playing) {
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187 int mode;
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188 this->hidden->playing = 1;
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189 mode = (spec->format == AUDIO_S8) ? SM_8BIT : SM_16BIT;
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190 if (spec->channels == 1) {
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191 aica_play(0, mode, this->hidden->leftpos, 0,
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192 spec->samples * 2, spec->freq, 255, 128, 1);
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193 } else {
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194 aica_play(0, mode, this->hidden->leftpos, 0,
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195 spec->samples * 2, spec->freq, 255, 0, 1);
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196 aica_play(1, mode, this->hidden->rightpos, 0,
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197 spec->samples * 2, spec->freq, 255, 255, 1);
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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 static Uint8 *
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203 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
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209 DCAUD_CloseAudio(_THIS)
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210 {
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211 aica_stop(0);
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212 if (this->spec.channels == 2)
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213 aica_stop(1);
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214 if (this->hidden->mixbuf != NULL) {
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215 SDL_FreeAudioMem(this->hidden->mixbuf);
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216 this->hidden->mixbuf = NULL;
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217 }
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218 }
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219
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220 static int
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221 DCAUD_OpenAudio(_THIS, SDL_AudioSpec * spec)
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222 {
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223 switch (spec->format & 0xff) {
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224 case 8:
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225 spec->format = AUDIO_S8;
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226 break;
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227 case 16:
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228 spec->format = AUDIO_S16LSB;
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229 break;
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230 default:
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231 SDL_SetError("Unsupported audio format");
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232 return (-1);
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233 }
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234
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235 /* Update the fragment size as size in bytes */
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236 SDL_CalculateAudioSpec(spec);
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237
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238 /* Allocate mixing buffer */
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239 this->hidden->mixlen = spec->size;
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240 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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241 if (this->hidden->mixbuf == NULL) {
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242 return (-1);
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243 }
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244 SDL_memset(this->hidden->mixbuf, spec->silence, spec->size);
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245 this->hidden->leftpos = 0x11000;
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246 this->hidden->rightpos = 0x11000 + spec->size;
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247 this->hidden->playing = 0;
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248 this->hidden->nextbuf = 0;
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249
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250 /* We're ready to rock and roll. :-) */
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251 return (0);
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252 }
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253
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254 /* vi: set ts=4 sw=4 expandtab: */