annotate src/audio/dmedia/SDL_irixaudio.c @ 1358:c71e05b4dc2e

More header massaging... works great on Windows. ;-)
author Sam Lantinga <slouken@libsdl.org>
date Fri, 10 Feb 2006 06:48:43 +0000
parents 604d73db6802
children 19418e4422cb
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 /* Allow access to a raw mixing buffer (For IRIX 6.5 and higher) */
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24 /* patch for IRIX 5 by Georg Schwarz 18/07/2004 */
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25
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26 #include "SDL_timer.h"
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27 #include "SDL_audio.h"
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28 #include "SDL_audiomem.h"
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29 #include "SDL_audio_c.h"
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30 #include "SDL_irixaudio.h"
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31
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32
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33 #ifndef AL_RESOURCE /* as a test whether we use the old IRIX audio libraries */
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34 #define OLD_IRIX_AUDIO
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35 #define alClosePort(x) ALcloseport(x)
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36 #define alFreeConfig(x) ALfreeconfig(x)
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37 #define alGetFillable(x) ALgetfillable(x)
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38 #define alNewConfig() ALnewconfig()
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39 #define alOpenPort(x,y,z) ALopenport(x,y,z)
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40 #define alSetChannels(x,y) ALsetchannels(x,y)
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41 #define alSetQueueSize(x,y) ALsetqueuesize(x,y)
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42 #define alSetSampFmt(x,y) ALsetsampfmt(x,y)
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43 #define alSetWidth(x,y) ALsetwidth(x,y)
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44 #endif
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45
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46 /* Audio driver functions */
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47 static int AL_OpenAudio(_THIS, SDL_AudioSpec *spec);
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48 static void AL_WaitAudio(_THIS);
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49 static void AL_PlayAudio(_THIS);
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50 static Uint8 *AL_GetAudioBuf(_THIS);
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51 static void AL_CloseAudio(_THIS);
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52
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53 /* Audio driver bootstrap functions */
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54
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55 static int Audio_Available(void)
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56 {
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57 return 1;
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58 }
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59
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60 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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61 {
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62 SDL_free(device->hidden);
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63 SDL_free(device);
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64 }
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65
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66 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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67 {
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68 SDL_AudioDevice *this;
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69
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70 /* Initialize all variables that we clean on shutdown */
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71 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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72 if ( this ) {
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73 SDL_memset(this, 0, (sizeof *this));
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74 this->hidden = (struct SDL_PrivateAudioData *)
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75 SDL_malloc((sizeof *this->hidden));
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76 }
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77 if ( (this == NULL) || (this->hidden == NULL) ) {
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78 SDL_OutOfMemory();
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79 if ( this ) {
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80 SDL_free(this);
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81 }
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82 return(0);
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83 }
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84 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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85
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86 /* Set the function pointers */
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87 this->OpenAudio = AL_OpenAudio;
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88 this->WaitAudio = AL_WaitAudio;
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89 this->PlayAudio = AL_PlayAudio;
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90 this->GetAudioBuf = AL_GetAudioBuf;
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91 this->CloseAudio = AL_CloseAudio;
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92
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93 this->free = Audio_DeleteDevice;
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94
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95 return this;
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96 }
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97
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98 AudioBootStrap DMEDIA_bootstrap = {
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99 "AL", "IRIX DMedia audio",
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100 Audio_Available, Audio_CreateDevice
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101 };
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102
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103
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104 void static AL_WaitAudio(_THIS)
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105 {
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106 Sint32 timeleft;
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107
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108 timeleft = this->spec.samples - alGetFillable(audio_port);
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109 if ( timeleft > 0 ) {
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110 timeleft /= (this->spec.freq/1000);
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111 SDL_Delay((Uint32)timeleft);
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112 }
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113 }
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114
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115 static void AL_PlayAudio(_THIS)
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116 {
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117 /* Write the audio data out */
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118 if ( alWriteFrames(audio_port, mixbuf, this->spec.samples) < 0 ) {
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119 /* Assume fatal error, for now */
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120 this->enabled = 0;
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121 }
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122 }
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123
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124 static Uint8 *AL_GetAudioBuf(_THIS)
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125 {
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126 return(mixbuf);
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127 }
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128
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129 static void AL_CloseAudio(_THIS)
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130 {
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131 if ( mixbuf != NULL ) {
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132 SDL_FreeAudioMem(mixbuf);
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133 mixbuf = NULL;
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134 }
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135 if ( audio_port != NULL ) {
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136 alClosePort(audio_port);
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137 audio_port = NULL;
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138 }
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139 }
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140
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141 static int AL_OpenAudio(_THIS, SDL_AudioSpec *spec)
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142 {
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143 ALconfig audio_config;
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144 #ifdef OLD_IRIX_AUDIO
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145 long audio_param[2];
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146 #else
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147 ALpv audio_param;
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148 #endif
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149 int width;
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150
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151 /* Determine the audio parameters from the AudioSpec */
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152 switch ( spec->format & 0xFF ) {
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153
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154 case 8: { /* Signed 8 bit audio data */
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155 spec->format = AUDIO_S8;
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156 width = AL_SAMPLE_8;
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157 }
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158 break;
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159
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160 case 16: { /* Signed 16 bit audio data */
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161 spec->format = AUDIO_S16MSB;
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162 width = AL_SAMPLE_16;
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163 }
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164 break;
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165
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166 default: {
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167 SDL_SetError("Unsupported audio format");
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168 return(-1);
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169 }
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170 }
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171
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172 /* Update the fragment size as size in bytes */
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173 SDL_CalculateAudioSpec(spec);
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174
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175 /* Set output frequency */
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176 #ifdef OLD_IRIX_AUDIO
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177 audio_param[0] = AL_OUTPUT_RATE;
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178 audio_param[1] = spec->freq;
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179 if( ALsetparams(AL_DEFAULT_DEVICE, audio_param, 2) < 0 ) {
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180 #else
0
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181 audio_param.param = AL_RATE;
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182 audio_param.value.i = spec->freq;
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183 if( alSetParams(AL_DEFAULT_OUTPUT, &audio_param, 1) < 0 ) {
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184 #endif
0
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185 SDL_SetError("alSetParams failed");
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186 return(-1);
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187 }
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188
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189 /* Open the audio port with the requested frequency */
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190 audio_port = NULL;
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191 audio_config = alNewConfig();
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192 if ( audio_config &&
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193 (alSetSampFmt(audio_config, AL_SAMPFMT_TWOSCOMP) >= 0) &&
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194 (alSetWidth(audio_config, width) >= 0) &&
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195 (alSetQueueSize(audio_config, spec->samples*2) >= 0) &&
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196 (alSetChannels(audio_config, spec->channels) >= 0) ) {
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197 audio_port = alOpenPort("SDL audio", "w", audio_config);
0
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198 }
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199 alFreeConfig(audio_config);
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200 if( audio_port == NULL ) {
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201 SDL_SetError("Unable to open audio port");
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202 return(-1);
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203 }
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204
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205 /* Allocate mixing buffer */
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206 mixbuf = (Uint8 *)SDL_AllocAudioMem(spec->size);
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207 if ( mixbuf == NULL ) {
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208 SDL_OutOfMemory();
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209 return(-1);
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210 }
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211 SDL_memset(mixbuf, spec->silence, spec->size);
0
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212
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213 /* We're ready to rock and roll. :-) */
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214 return(0);
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215 }