Mercurial > sdl-ios-xcode

annotate src/audio/dc/SDL_dcaudio.c @ 3816:9d070c1a45fa SDL-ryan-multiple-audio-device

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Moved AudioBootstrap section in converted drivers to bottom of source, so I could delete the predeclarations (one more thing to forget to update when changing the API, otherwise). There're a few other cleanups that snuck into this commit, too.
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 06 Oct 2006 04:46:58 +0000
parents c8b3d3d13ed1
children b225d9820ee3
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_dcaudio.h"
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32
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33 #include "aica.h"
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34 #include <dc/spu.h>
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35
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36 /* Audio driver functions */
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37 static int DCAUD_OpenAudio(_THIS, SDL_AudioSpec * spec);
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38 static void DCAUD_WaitAudio(_THIS);
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39 static void DCAUD_PlayAudio(_THIS);
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40 static Uint8 *DCAUD_GetAudioBuf(_THIS);
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41 static void DCAUD_CloseAudio(_THIS);
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42
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43 /* Audio driver bootstrap functions */
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44 static int
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45 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
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51 DCAUD_DeleteDevice(SDL_AudioDevice * device)
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52 {
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53 SDL_free(device->hidden);
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54 SDL_free(device);
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55 }
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56
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57 static SDL_AudioDevice *
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58 DCAUD_CreateDevice(int devindex)
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59 {
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60 SDL_AudioDevice *this;
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61
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62 /* Initialize all variables that we clean on shutdown */
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63 this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
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64 if (this) {
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65 SDL_memset(this, 0, (sizeof *this));
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66 this->hidden = (struct SDL_PrivateAudioData *)
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67 SDL_malloc((sizeof *this->hidden));
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68 }
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69 if ((this == NULL) || (this->hidden == NULL)) {
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70 SDL_OutOfMemory();
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71 if (this) {
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72 SDL_free(this);
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73 }
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74 return (0);
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75 }
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76 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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77
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78 /* Set the function pointers */
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79 this->OpenAudio = DCAUD_OpenAudio;
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80 this->WaitAudio = DCAUD_WaitAudio;
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81 this->PlayAudio = DCAUD_PlayAudio;
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82 this->GetAudioBuf = DCAUD_GetAudioBuf;
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83 this->CloseAudio = DCAUD_CloseAudio;
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84
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85 this->free = DCAUD_DeleteDevice;
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86
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87 spu_init();
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88
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89 return this;
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90 }
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91
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92 AudioBootStrap DCAUD_bootstrap = {
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93 "dcaudio", "Dreamcast AICA audio",
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94 DCAUD_Available, DCAUD_CreateDevice, 0
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95 };
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96
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97 /* This function waits until it is possible to write a full sound buffer */
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98 static void
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99 DCAUD_WaitAudio(_THIS)
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100 {
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101 if (this->hidden->playing) {
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102 /* wait */
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103 while (aica_get_pos(0) / this->spec.samples == this->hidden->nextbuf) {
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104 thd_pass();
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105 }
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106 }
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107 }
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108
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109 #define SPU_RAM_BASE 0xa0800000
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110
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111 static void
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112 spu_memload_stereo8(int leftpos, int rightpos, void *src0, size_t size)
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113 {
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114 uint8 *src = src0;
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115 uint32 *left = (uint32 *) (leftpos + SPU_RAM_BASE);
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116 uint32 *right = (uint32 *) (rightpos + SPU_RAM_BASE);
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117 size = (size + 7) / 8;
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118 while (size--) {
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119 unsigned lval, rval;
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120 lval = *src++;
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121 rval = *src++;
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122 lval |= (*src++) << 8;
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123 rval |= (*src++) << 8;
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124 lval |= (*src++) << 16;
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125 rval |= (*src++) << 16;
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126 lval |= (*src++) << 24;
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127 rval |= (*src++) << 24;
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128 g2_write_32(left++, lval);
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129 g2_write_32(right++, rval);
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130 g2_fifo_wait();
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131 }
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132 }
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133
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134 static void
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135 spu_memload_stereo16(int leftpos, int rightpos, void *src0, size_t size)
509
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136 {
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137 uint16 *src = src0;
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138 uint32 *left = (uint32 *) (leftpos + SPU_RAM_BASE);
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139 uint32 *right = (uint32 *) (rightpos + SPU_RAM_BASE);
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140 size = (size + 7) / 8;
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141 while (size--) {
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142 unsigned lval, rval;
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143 lval = *src++;
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144 rval = *src++;
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145 lval |= (*src++) << 16;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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146 rval |= (*src++) << 16;
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147 g2_write_32(left++, lval);
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148 g2_write_32(right++, rval);
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149 g2_fifo_wait();
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150 }
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151 }
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152
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153 static void
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154 DCAUD_PlayAudio(_THIS)
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155 {
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156 SDL_AudioSpec *spec = &this->spec;
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157 unsigned int offset;
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158
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159 if (this->hidden->playing) {
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160 /* wait */
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161 while (aica_get_pos(0) / spec->samples == this->hidden->nextbuf) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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162 thd_pass();
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163 }
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164 }
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165
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166 offset = this->hidden->nextbuf * spec->size;
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167 this->hidden->nextbuf ^= 1;
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168 /* Write the audio data, checking for EAGAIN on broken audio drivers */
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169 if (spec->channels == 1) {
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170 spu_memload(this->hidden->leftpos + offset, this->hidden->mixbuf,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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171 this->hidden->mixlen);
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172 } else {
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diff changeset
173 offset /= 2;
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diff changeset
174 if ((this->spec.format & 255) == 8) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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175 spu_memload_stereo8(this->hidden->leftpos + offset,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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176 this->hidden->rightpos + offset,
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177 this->hidden->mixbuf, this->hidden->mixlen);
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178 } else {
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diff changeset
179 spu_memload_stereo16(this->hidden->leftpos + offset,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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180 this->hidden->rightpos + offset,
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181 this->hidden->mixbuf, this->hidden->mixlen);
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182 }
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183 }
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184
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185 if (!this->hidden->playing) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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186 int mode;
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187 this->hidden->playing = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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188 mode = (spec->format == AUDIO_S8) ? SM_8BIT : SM_16BIT;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
189 if (spec->channels == 1) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
190 aica_play(0, mode, this->hidden->leftpos, 0,
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diff changeset
191 spec->samples * 2, spec->freq, 255, 128, 1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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192 } else {
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diff changeset
193 aica_play(0, mode, this->hidden->leftpos, 0,
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diff changeset
194 spec->samples * 2, spec->freq, 255, 0, 1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
195 aica_play(1, mode, this->hidden->rightpos, 0,
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diff changeset
196 spec->samples * 2, spec->freq, 255, 255, 1);
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diff changeset
197 }
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198 }
509
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199 }
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200
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diff changeset
201 static Uint8 *
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diff changeset
202 DCAUD_GetAudioBuf(_THIS)
509
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diff changeset
203 {
1895
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diff changeset
204 return (this->hidden->mixbuf);
509
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diff changeset
205 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
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parents:
diff changeset
206
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diff changeset
207 static void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
208 DCAUD_CloseAudio(_THIS)
509
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diff changeset
209 {
1895
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diff changeset
210 aica_stop(0);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
211 if (this->spec.channels == 2)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
212 aica_stop(1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
213 if (this->hidden->mixbuf != NULL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1461
diff changeset
214 SDL_FreeAudioMem(this->hidden->mixbuf);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
215 this->hidden->mixbuf = NULL;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
216 }
509
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217 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
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diff changeset
218
1895
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diff changeset
219 static int
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
220 DCAUD_OpenAudio(_THIS, SDL_AudioSpec * spec)
509
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diff changeset
221 {
2000
8c05b048c32c Let SDL convert to valid Dreamcast audio formats instead of failing if the
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parents: 1895
diff changeset
222 SDL_AudioFormat test_format = SDL_FirstAudioFormat(spec->format);
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Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
223 int valid_datatype = 0;
8c05b048c32c Let SDL convert to valid Dreamcast audio formats instead of failing if the
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
224 while ((!valid_datatype) && (test_format)) {
8c05b048c32c Let SDL convert to valid Dreamcast audio formats instead of failing if the
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
225 spec->format = test_format;
8c05b048c32c Let SDL convert to valid Dreamcast audio formats instead of failing if the
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
226 switch (test_format) {
8c05b048c32c Let SDL convert to valid Dreamcast audio formats instead of failing if the
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diff changeset
227 /* only formats Dreamcast accepts... */
2043
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Sam Lantinga <slouken@libsdl.org>
parents: 2000
diff changeset
228 case AUDIO_S8:
adf732f1f016 Formatting update
Sam Lantinga <slouken@libsdl.org>
parents: 2000
diff changeset
229 case AUDIO_S16LSB:
adf732f1f016 Formatting update
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parents: 2000
diff changeset
230 valid_datatype = 1;
adf732f1f016 Formatting update
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diff changeset
231 break;
2000
8c05b048c32c Let SDL convert to valid Dreamcast audio formats instead of failing if the
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diff changeset
232
2043
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diff changeset
233 default:
adf732f1f016 Formatting update
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parents: 2000
diff changeset
234 test_format = SDL_NextAudioFormat();
adf732f1f016 Formatting update
Sam Lantinga <slouken@libsdl.org>
parents: 2000
diff changeset
235 break;
2000
8c05b048c32c Let SDL convert to valid Dreamcast audio formats instead of failing if the
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
236 }
8c05b048c32c Let SDL convert to valid Dreamcast audio formats instead of failing if the
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
237 }
8c05b048c32c Let SDL convert to valid Dreamcast audio formats instead of failing if the
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diff changeset
238
2043
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Sam Lantinga <slouken@libsdl.org>
parents: 2000
diff changeset
239 if (!valid_datatype) { /* shouldn't happen, but just in case... */
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
240 SDL_SetError("Unsupported audio format");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1461
diff changeset
241 return (-1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1461
diff changeset
242 }
509
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
243
2000
8c05b048c32c Let SDL convert to valid Dreamcast audio formats instead of failing if the
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
244 if (spec->channels > 2)
2043
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Sam Lantinga <slouken@libsdl.org>
parents: 2000
diff changeset
245 spec->channels = 2; /* no more than stereo on the Dreamcast. */
2000
8c05b048c32c Let SDL convert to valid Dreamcast audio formats instead of failing if the
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
246
1895
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diff changeset
247 /* Update the fragment size as size in bytes */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
248 SDL_CalculateAudioSpec(spec);
509
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diff changeset
249
1895
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diff changeset
250 /* Allocate mixing buffer */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
251 this->hidden->mixlen = spec->size;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
252 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1461
diff changeset
253 if (this->hidden->mixbuf == NULL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1461
diff changeset
254 return (-1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1461
diff changeset
255 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1461
diff changeset
256 SDL_memset(this->hidden->mixbuf, spec->silence, spec->size);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1461
diff changeset
257 this->hidden->leftpos = 0x11000;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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258 this->hidden->rightpos = 0x11000 + spec->size;
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259 this->hidden->playing = 0;
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260 this->hidden->nextbuf = 0;
509
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
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261
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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262 /* We're ready to rock and roll. :-) */
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263 return (0);
509
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
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parents:
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264 }
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1461
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265
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1461
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266 /* vi: set ts=4 sw=4 expandtab: */