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annotate src/audio/dc/SDL_dcaudio.c @ 1675:d33dcfc3fde7 SDL-1.3

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Overlay functions are being replaced by YUV textures. If the driver doesn't support YUV textures, they can be emulated by backing the texture with an RGB texture and using the software conversion routines. Note that it doesn't make sense to lock a portion of a YV12 texture, since you'd need to return three pixel pointers and pitch values instead of the one that's available through the API. I'm guessing that's one of the reasons DirectX 9 doesn't support this format at all.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 11 Jun 2006 07:30:16 +0000
parents 4da1ee79c9af
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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);
509
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252 }
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1461
diff changeset
253
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1461
diff changeset
254 /* vi: set ts=4 sw=4 expandtab: */