Mercurial > sdl-ios-xcode

annotate src/audio/dc/SDL_dcaudio.c @ 3798:c8b3d3d13ed1 SDL-ryan-multiple-audio-device

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Audio bootstraps can now specify that a driver is only to be used if explicitly requested (for things like the "disk" driver that is always available but you would never want to default to using). Trimmed out code that can be handled by stubs in the core. The "dummy" driver is pretty damned small now. :)
author Ryan C. Gordon <icculus@icculus.org>
date Wed, 04 Oct 2006 21:27:53 +0000
parents adf732f1f016
children 9d070c1a45fa
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
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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, 0
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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 }
509
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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)
509
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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;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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147 rval |= (*src++) << 16;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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171 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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172 this->hidden->mixlen);
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173 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
174 offset /= 2;
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diff changeset
175 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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176 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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177 this->hidden->rightpos + offset,
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178 this->hidden->mixbuf, this->hidden->mixlen);
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diff changeset
179 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
180 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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181 this->hidden->rightpos + offset,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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
1895
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186 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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187 int mode;
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188 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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189 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
190 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
191 aica_play(0, mode, this->hidden->leftpos, 0,
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diff changeset
192 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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193 } else {
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194 aica_play(0, mode, this->hidden->leftpos, 0,
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diff changeset
195 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
196 aica_play(1, mode, this->hidden->rightpos, 0,
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diff changeset
197 spec->samples * 2, spec->freq, 255, 255, 1);
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diff changeset
198 }
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199 }
509
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200 }
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diff changeset
201
1895
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diff changeset
202 static Uint8 *
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diff changeset
203 DCAUD_GetAudioBuf(_THIS)
509
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diff changeset
204 {
1895
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diff changeset
205 return (this->hidden->mixbuf);
509
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diff changeset
206 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
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diff changeset
207
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diff changeset
208 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
209 DCAUD_CloseAudio(_THIS)
509
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diff changeset
210 {
1895
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diff changeset
211 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
212 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
213 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
214 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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diff changeset
215 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
216 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
217 }
509
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218 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
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diff changeset
219
1895
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diff changeset
220 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
221 DCAUD_OpenAudio(_THIS, SDL_AudioSpec * spec)
509
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diff changeset
222 {
2000
8c05b048c32c Let SDL convert to valid Dreamcast audio formats instead of failing if the
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diff changeset
223 SDL_AudioFormat test_format = SDL_FirstAudioFormat(spec->format);
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Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
224 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
225 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
226 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
227 switch (test_format) {
8c05b048c32c Let SDL convert to valid Dreamcast audio formats instead of failing if the
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diff changeset
228 /* only formats Dreamcast accepts... */
2043
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Sam Lantinga <slouken@libsdl.org>
parents: 2000
diff changeset
229 case AUDIO_S8:
adf732f1f016 Formatting update
Sam Lantinga <slouken@libsdl.org>
parents: 2000
diff changeset
230 case AUDIO_S16LSB:
adf732f1f016 Formatting update
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parents: 2000
diff changeset
231 valid_datatype = 1;
adf732f1f016 Formatting update
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diff changeset
232 break;
2000
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diff changeset
233
2043
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diff changeset
234 default:
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parents: 2000
diff changeset
235 test_format = SDL_NextAudioFormat();
adf732f1f016 Formatting update
Sam Lantinga <slouken@libsdl.org>
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diff changeset
236 break;
2000
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
237 }
8c05b048c32c Let SDL convert to valid Dreamcast audio formats instead of failing if the
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
238 }
8c05b048c32c Let SDL convert to valid Dreamcast audio formats instead of failing if the
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diff changeset
239
2043
adf732f1f016 Formatting update
Sam Lantinga <slouken@libsdl.org>
parents: 2000
diff changeset
240 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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parents: 1461
diff changeset
241 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
242 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
243 }
509
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
244
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
245 if (spec->channels > 2)
2043
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Sam Lantinga <slouken@libsdl.org>
parents: 2000
diff changeset
246 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
247
1895
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diff changeset
248 /* 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>
parents: 1461
diff changeset
249 SDL_CalculateAudioSpec(spec);
509
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
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parents:
diff changeset
250
1895
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diff changeset
251 /* Allocate mixing buffer */
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
252 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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parents: 1461
diff changeset
253 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
254 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
255 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
256 }
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 SDL_memset(this->hidden->mixbuf, spec->silence, spec->size);
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258 this->hidden->leftpos = 0x11000;
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259 this->hidden->rightpos = 0x11000 + spec->size;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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260 this->hidden->playing = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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261 this->hidden->nextbuf = 0;
509
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
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262
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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263 /* We're ready to rock and roll. :-) */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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264 return (0);
509
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
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265 }
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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266
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
267 /* vi: set ts=4 sw=4 expandtab: */