Mercurial > sdl-ios-xcode

annotate src/audio/dc/SDL_dcaudio.c @ 3818:49eadd6e8962 SDL-ryan-multiple-audio-device

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Mangled ALSA dynamic loading...static loading will still work if you have the right libraries, but this is expected to break in general cases as we start dealing with different symbol versions, etc (but may work with, say, distro-specific packages, etc).
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 06 Oct 2006 19:45:11 +0000
parents 9d070c1a45fa
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: */