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annotate src/audio/dmedia/SDL_irixaudio.c @ 3821:18393b045759 SDL-ryan-multiple-audio-device

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Moved NAS audio driver to 1.3 API.
author Ryan C. Gordon <icculus@icculus.org>
date Sat, 07 Oct 2006 05:56:59 +0000
parents 1f156fd874fa
children 66fb40445587
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 #include <errno.h>
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23 #include "SDL_config.h"
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24
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25 /* Allow access to a raw mixing buffer (For IRIX 6.5 and higher) */
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26 /* patch for IRIX 5 by Georg Schwarz 18/07/2004 */
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27
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28 #include "SDL_timer.h"
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29 #include "SDL_audio.h"
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30 #include "../SDL_audiomem.h"
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31 #include "../SDL_audio_c.h"
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32 #include "SDL_irixaudio.h"
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33
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34
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35 #ifndef AL_RESOURCE /* as a test whether we use the old IRIX audio libraries */
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36 #define OLD_IRIX_AUDIO
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37 #define alClosePort(x) ALcloseport(x)
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38 #define alFreeConfig(x) ALfreeconfig(x)
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39 #define alGetFillable(x) ALgetfillable(x)
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40 #define alNewConfig() ALnewconfig()
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41 #define alOpenPort(x,y,z) ALopenport(x,y,z)
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42 #define alSetChannels(x,y) ALsetchannels(x,y)
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43 #define alSetQueueSize(x,y) ALsetqueuesize(x,y)
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44 #define alSetSampFmt(x,y) ALsetsampfmt(x,y)
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45 #define alSetWidth(x,y) ALsetwidth(x,y)
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46 #endif
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47
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48 static int
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49 IRIXAUDIO_Available(void)
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50 {
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51 return 1;
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52 }
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53
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54 void static
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55 IRIXAUDIO_WaitDevice(_THIS)
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56 {
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57 Sint32 timeleft;
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58
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59 timeleft = this->spec.samples - alGetFillable(this->hidden->audio_port);
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60 if (timeleft > 0) {
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61 timeleft /= (this->spec.freq / 1000);
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62 SDL_Delay((Uint32) timeleft);
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63 }
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64 }
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65
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66 static void
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67 IRIXAUDIO_PlayDevice(_THIS)
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68 {
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69 /* Write the audio data out */
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70 ALport port = this->hidden->audio_port;
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71 Uint8 *mixbuf = this->hidden->mixbuf;
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72 if (alWriteFrames(port, mixbuf, this->spec.samples) < 0) {
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73 /* Assume fatal error, for now */
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74 this->enabled = 0;
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75 }
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76 }
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77
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78 static Uint8 *
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79 IRIXAUDIO_GetDeviceBuf(_THIS)
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80 {
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81 return (this->hidden->mixbuf);
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82 }
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83
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84 static void
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85 IRIXAUDIO_CloseDevice(_THIS)
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86 {
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87 if (this->hidden != NULL) {
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88 if (this->hidden->mixbuf != NULL) {
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89 SDL_FreeAudioMem(this->hidden->mixbuf);
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90 this->hidden->mixbuf = NULL;
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91 }
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92 if (this->hidden->audio_port != NULL) {
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93 alClosePort(this->hidden->audio_port);
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94 this->hidden->audio_port = NULL;
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95 }
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96 SDL_free(this->hidden);
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97 this->hidden = NULL;
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98 }
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99 }
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100
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101 static int
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102 IRIXAUDIO_OpenDevice(_THIS, const char *devname, int iscapture)
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103 {
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104 SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
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105 long width = 0;
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106 long fmt = 0;
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107 int valid = 0;
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108
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109 /* !!! FIXME: Handle multiple devices and capture? */
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110
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111 /* Initialize all variables that we clean on shutdown */
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112 this->hidden = (struct SDL_PrivateAudioData *)
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113 SDL_malloc((sizeof *this->hidden));
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114 if (this->hidden == NULL) {
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115 SDL_OutOfMemory();
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116 return 0;
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117 }
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118 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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119
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120 #ifdef OLD_IRIX_AUDIO
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121 {
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122 long audio_param[2];
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123 audio_param[0] = AL_OUTPUT_RATE;
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124 audio_param[1] = this->spec.freq;
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125 valid = (ALsetparams(AL_DEFAULT_DEVICE, audio_param, 2) < 0);
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126 }
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127 #else
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128 {
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129 ALpv audio_param;
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130 audio_param.param = AL_RATE;
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131 audio_param.value.i = this->spec.freq;
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132 valid = (alSetParams(AL_DEFAULT_OUTPUT, &audio_param, 1) < 0);
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133 }
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6e6248801043 Date: Sun, 18 Jul 2004 16:46:44 +0200
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134 #endif
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135
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136 while ((!valid) && (test_format)) {
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137 valid = 1;
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138 this->spec.format = test_format;
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139
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140 switch (test_format) {
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141 case AUDIO_S8:
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142 width = AL_SAMPLE_8;
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143 fmt = AL_SAMPFMT_TWOSCOMP;
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144 break;
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145
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146 case AUDIO_S16SYS:
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147 width = AL_SAMPLE_16;
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148 fmt = AL_SAMPFMT_TWOSCOMP;
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149 break;
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150
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151 case AUDIO_F32SYS:
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152 width = 0; /* not used here... */
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153 fmt = AL_SAMPFMT_FLOAT;
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154 break;
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155
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156 /* Docs say there is int24, but not int32.... */
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157
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158 default:
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159 valid = 0;
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160 test_format = SDL_NextAudioFormat();
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161 break;
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162 }
2002
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163
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164 if (valid) {
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165 ALconfig audio_config = alNewConfig();
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166 valid = 0;
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167 if (audio_config) {
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168 if (alSetChannels(audio_config, this->spec.channels) < 0) {
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169 if (this->spec.channels > 2) { /* can't handle > stereo? */
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170 this->spec.channels = 2; /* try again below. */
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171 }
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172 }
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173
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174 if ((alSetSampFmt(audio_config, fmt) >= 0) &&
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175 ((!width) || (alSetWidth(audio_config, width) >= 0)) &&
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176 (alSetQueueSize(audio_config,this->spec.samples*2) >= 0) &&
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177 (alSetChannels(audio_config, this->spec.channels) >= 0)) {
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178
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179 this->hidden->audio_port = alOpenPort("SDL audio", "w",
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180 audio_config);
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181 if (this->hidden->audio_port == NULL) {
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182 /* docs say AL_BAD_CHANNELS happens here, too. */
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183 int err = oserror();
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184 if (err == AL_BAD_CHANNELS) {
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185 this->spec.channels = 2;
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186 alSetChannels(audio_config, this->spec.channels);
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187 this->hidden->audio_port = alOpenPort("SDL audio", "w",
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188 audio_config);
2002
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189 }
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190 }
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191
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192 if (this->hidden->audio_port != NULL) {
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193 valid = 1;
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194 }
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195 }
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196
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197 alFreeConfig(audio_config);
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198 }
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199 }
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200 }
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201
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202 if (!valid) {
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203 IRIXAUDIO_CloseDevice(this);
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204 SDL_SetError("Unsupported audio format");
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205 return 0;
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206 }
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207
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208 /* Update the fragment size as size in bytes */
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209 SDL_CalculateAudioSpec(&this->spec);
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210
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211 /* Allocate mixing buffer */
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212 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->spec.size);
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213 if (this->hidden->mixbuf == NULL) {
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214 IRIXAUDIO_CloseDevice(this);
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215 SDL_OutOfMemory();
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216 return 0;
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217 }
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218 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
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219
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220 /* We're ready to rock and roll. :-) */
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221 return 1;
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222 }
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223
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224 static int
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225 IRIXAUDIO_Init(SDL_AudioDriverImpl *impl)
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226 {
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227 /* Set the function pointers */
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228 impl->OpenDevice = DSP_OpenDevice;
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229 impl->PlayDevice = DSP_PlayDevice;
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230 impl->WaitDevice = DSP_WaitDevice;
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231 impl->GetDeviceBuf = DSP_GetDeviceBuf;
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232 impl->CloseDevice = DSP_CloseDevice;
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233 impl->OnlyHasDefaultOutputDevice = 1; /* !!! FIXME: not true, I think. */
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234
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235 return 1;
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236 }
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237
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238 AudioBootStrap IRIXAUDIO_bootstrap = {
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239 "AL", "IRIX DMedia audio",
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240 IRIXAUDIO_Available, IRIXAUDIO_Init, 0
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241 };
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242
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243 /* vi: set ts=4 sw=4 expandtab: */