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annotate src/audio/dmedia/SDL_irixaudio.c @ 1662:782fd950bd46 SDL-1.3

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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:04:16 +0000
parents d910939febfa
children 4da1ee79c9af
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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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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24 /* Allow access to a raw mixing buffer (For IRIX 6.5 and higher) */
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25 /* patch for IRIX 5 by Georg Schwarz 18/07/2004 */
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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_irixaudio.h"
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32
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33
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34 #ifndef AL_RESOURCE /* as a test whether we use the old IRIX audio libraries */
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35 #define OLD_IRIX_AUDIO
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36 #define alClosePort(x) ALcloseport(x)
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37 #define alFreeConfig(x) ALfreeconfig(x)
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38 #define alGetFillable(x) ALgetfillable(x)
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39 #define alNewConfig() ALnewconfig()
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40 #define alOpenPort(x,y,z) ALopenport(x,y,z)
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41 #define alSetChannels(x,y) ALsetchannels(x,y)
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42 #define alSetQueueSize(x,y) ALsetqueuesize(x,y)
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43 #define alSetSampFmt(x,y) ALsetsampfmt(x,y)
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44 #define alSetWidth(x,y) ALsetwidth(x,y)
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45 #endif
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46
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47 /* Audio driver functions */
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48 static int AL_OpenAudio (_THIS, SDL_AudioSpec * spec);
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49 static void AL_WaitAudio (_THIS);
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50 static void AL_PlayAudio (_THIS);
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51 static Uint8 *AL_GetAudioBuf (_THIS);
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52 static void AL_CloseAudio (_THIS);
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53
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54 /* Audio driver bootstrap functions */
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55
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56 static int
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57 Audio_Available (void)
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58 {
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59 return 1;
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60 }
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61
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62 static void
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63 Audio_DeleteDevice (SDL_AudioDevice * device)
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64 {
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65 SDL_free (device->hidden);
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66 SDL_free (device);
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67 }
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68
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69 static SDL_AudioDevice *
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70 Audio_CreateDevice (int devindex)
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71 {
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72 SDL_AudioDevice *this;
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73
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74 /* Initialize all variables that we clean on shutdown */
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75 this = (SDL_AudioDevice *) SDL_malloc (sizeof (SDL_AudioDevice));
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76 if (this) {
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77 SDL_memset (this, 0, (sizeof *this));
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78 this->hidden = (struct SDL_PrivateAudioData *)
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79 SDL_malloc ((sizeof *this->hidden));
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80 }
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81 if ((this == NULL) || (this->hidden == NULL)) {
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82 SDL_OutOfMemory ();
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83 if (this) {
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84 SDL_free (this);
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85 }
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86 return (0);
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87 }
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88 SDL_memset (this->hidden, 0, (sizeof *this->hidden));
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89
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90 /* Set the function pointers */
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91 this->OpenAudio = AL_OpenAudio;
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92 this->WaitAudio = AL_WaitAudio;
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93 this->PlayAudio = AL_PlayAudio;
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94 this->GetAudioBuf = AL_GetAudioBuf;
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95 this->CloseAudio = AL_CloseAudio;
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96
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97 this->free = Audio_DeleteDevice;
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98
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99 return this;
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100 }
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101
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102 AudioBootStrap DMEDIA_bootstrap = {
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103 "AL", "IRIX DMedia audio",
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104 Audio_Available, Audio_CreateDevice
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105 };
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106
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107
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108 void static
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109 AL_WaitAudio (_THIS)
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110 {
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111 Sint32 timeleft;
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112
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113 timeleft = this->spec.samples - alGetFillable (audio_port);
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114 if (timeleft > 0) {
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115 timeleft /= (this->spec.freq / 1000);
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116 SDL_Delay ((Uint32) timeleft);
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117 }
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118 }
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119
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120 static void
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121 AL_PlayAudio (_THIS)
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122 {
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123 /* Write the audio data out */
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124 if (alWriteFrames (audio_port, mixbuf, this->spec.samples) < 0) {
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125 /* Assume fatal error, for now */
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126 this->enabled = 0;
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127 }
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128 }
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129
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130 static Uint8 *
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131 AL_GetAudioBuf (_THIS)
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132 {
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133 return (mixbuf);
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134 }
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135
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136 static void
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137 AL_CloseAudio (_THIS)
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138 {
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139 if (mixbuf != NULL) {
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140 SDL_FreeAudioMem (mixbuf);
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141 mixbuf = NULL;
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142 }
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143 if (audio_port != NULL) {
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144 alClosePort (audio_port);
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145 audio_port = NULL;
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146 }
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147 }
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148
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149 static int
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150 AL_OpenAudio (_THIS, SDL_AudioSpec * spec)
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151 {
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152 ALconfig audio_config;
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153 #ifdef OLD_IRIX_AUDIO
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154 long audio_param[2];
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155 #else
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156 ALpv audio_param;
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157 #endif
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158 int width;
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159
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160 /* Determine the audio parameters from the AudioSpec */
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161 switch (spec->format & 0xFF) {
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162
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163 case 8:
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164 { /* Signed 8 bit audio data */
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165 spec->format = AUDIO_S8;
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166 width = AL_SAMPLE_8;
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167 }
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168 break;
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169
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170 case 16:
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171 { /* Signed 16 bit audio data */
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172 spec->format = AUDIO_S16MSB;
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173 width = AL_SAMPLE_16;
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174 }
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175 break;
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176
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177 default:
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178 {
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179 SDL_SetError ("Unsupported audio format");
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180 return (-1);
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181 }
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182 }
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183
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184 /* Update the fragment size as size in bytes */
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185 SDL_CalculateAudioSpec (spec);
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186
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187 /* Set output frequency */
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188 #ifdef OLD_IRIX_AUDIO
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189 audio_param[0] = AL_OUTPUT_RATE;
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190 audio_param[1] = spec->freq;
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191 if (ALsetparams (AL_DEFAULT_DEVICE, audio_param, 2) < 0) {
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192 #else
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193 audio_param.param = AL_RATE;
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194 audio_param.value.i = spec->freq;
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195 if (alSetParams (AL_DEFAULT_OUTPUT, &audio_param, 1) < 0) {
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196 #endif
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197 SDL_SetError ("alSetParams failed");
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198 return (-1);
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199 }
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200
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201 /* Open the audio port with the requested frequency */
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202 audio_port = NULL;
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203 audio_config = alNewConfig ();
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204 if (audio_config &&
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205 (alSetSampFmt (audio_config, AL_SAMPFMT_TWOSCOMP) >= 0) &&
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206 (alSetWidth (audio_config, width) >= 0) &&
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207 (alSetQueueSize (audio_config, spec->samples * 2) >= 0) &&
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208 (alSetChannels (audio_config, spec->channels) >= 0)) {
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209 audio_port = alOpenPort ("SDL audio", "w", audio_config);
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210 }
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211 alFreeConfig (audio_config);
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212 if (audio_port == NULL) {
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213 SDL_SetError ("Unable to open audio port");
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214 return (-1);
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215 }
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216
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217 /* Allocate mixing buffer */
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218 mixbuf = (Uint8 *) SDL_AllocAudioMem (spec->size);
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219 if (mixbuf == NULL) {
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220 SDL_OutOfMemory ();
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221 return (-1);
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222 }
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223 SDL_memset (mixbuf, spec->silence, spec->size);
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224
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225 /* We're ready to rock and roll. :-) */
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226 return (0);
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227 }
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228
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229 /* vi: set ts=4 sw=4 expandtab: */