Mercurial > sdl-ios-xcode

annotate src/audio/dmedia/SDL_irixaudio.c @ 2938:2929ed239d2a

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Adjusted default choice of audio driver. If a driver can definitely see available devices, it is chosen. Otherwise, we'll take the first driver that initializes but saw no devices...this might be because it can't enumerate them, or there really aren't any available. This prevents the dsp driver from hogging control when there are no /dev/dsp* nodes (for example, on a Linux box with ALSA and no OSS emulation).
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 01 Jan 2009 07:54:58 +0000
parents 99210400e8b9
children f7b03b6838cb
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 void static
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49 IRIXAUDIO_WaitDevice(_THIS)
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50 {
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51 Sint32 timeleft;
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52
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53 timeleft = this->spec.samples - alGetFillable(this->hidden->audio_port);
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54 if (timeleft > 0) {
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55 timeleft /= (this->spec.freq / 1000);
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56 SDL_Delay((Uint32) timeleft);
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57 }
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58 }
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59
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60 static void
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61 IRIXAUDIO_PlayDevice(_THIS)
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62 {
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63 /* Write the audio data out */
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64 ALport port = this->hidden->audio_port;
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65 Uint8 *mixbuf = this->hidden->mixbuf;
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66 if (alWriteFrames(port, mixbuf, this->spec.samples) < 0) {
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67 /* Assume fatal error, for now */
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68 this->enabled = 0;
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69 }
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70 }
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71
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72 static Uint8 *
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73 IRIXAUDIO_GetDeviceBuf(_THIS)
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74 {
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75 return (this->hidden->mixbuf);
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76 }
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77
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78 static void
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79 IRIXAUDIO_CloseDevice(_THIS)
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80 {
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81 if (this->hidden != NULL) {
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82 if (this->hidden->mixbuf != NULL) {
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83 SDL_FreeAudioMem(this->hidden->mixbuf);
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84 this->hidden->mixbuf = NULL;
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85 }
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86 if (this->hidden->audio_port != NULL) {
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87 alClosePort(this->hidden->audio_port);
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88 this->hidden->audio_port = NULL;
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89 }
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90 SDL_free(this->hidden);
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91 this->hidden = NULL;
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92 }
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93 }
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94
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95 static int
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96 IRIXAUDIO_OpenDevice(_THIS, const char *devname, int iscapture)
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97 {
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98 SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
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99 long width = 0;
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100 long fmt = 0;
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101 int valid = 0;
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102
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103 /* !!! FIXME: Handle multiple devices and capture? */
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104
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105 /* Initialize all variables that we clean on shutdown */
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106 this->hidden = (struct SDL_PrivateAudioData *)
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107 SDL_malloc((sizeof *this->hidden));
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108 if (this->hidden == NULL) {
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109 SDL_OutOfMemory();
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110 return 0;
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111 }
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112 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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113
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114 #ifdef OLD_IRIX_AUDIO
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115 {
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116 long audio_param[2];
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117 audio_param[0] = AL_OUTPUT_RATE;
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118 audio_param[1] = this->spec.freq;
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119 valid = (ALsetparams(AL_DEFAULT_DEVICE, audio_param, 2) < 0);
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120 }
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121 #else
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122 {
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123 ALpv audio_param;
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124 audio_param.param = AL_RATE;
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125 audio_param.value.i = this->spec.freq;
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126 valid = (alSetParams(AL_DEFAULT_OUTPUT, &audio_param, 1) < 0);
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127 }
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128 #endif
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129
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130 while ((!valid) && (test_format)) {
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131 valid = 1;
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132 this->spec.format = test_format;
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133
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134 switch (test_format) {
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135 case AUDIO_S8:
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136 width = AL_SAMPLE_8;
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137 fmt = AL_SAMPFMT_TWOSCOMP;
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138 break;
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139
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140 case AUDIO_S16SYS:
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141 width = AL_SAMPLE_16;
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142 fmt = AL_SAMPFMT_TWOSCOMP;
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143 break;
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144
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145 case AUDIO_F32SYS:
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146 width = 0; /* not used here... */
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147 fmt = AL_SAMPFMT_FLOAT;
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148 break;
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149
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150 /* Docs say there is int24, but not int32.... */
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151
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152 default:
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153 valid = 0;
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154 test_format = SDL_NextAudioFormat();
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155 break;
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156 }
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157
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158 if (valid) {
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159 ALconfig audio_config = alNewConfig();
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160 valid = 0;
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161 if (audio_config) {
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162 if (alSetChannels(audio_config, this->spec.channels) < 0) {
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163 if (this->spec.channels > 2) { /* can't handle > stereo? */
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164 this->spec.channels = 2; /* try again below. */
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165 }
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166 }
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167
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168 if ((alSetSampFmt(audio_config, fmt) >= 0) &&
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169 ((!width) || (alSetWidth(audio_config, width) >= 0)) &&
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170 (alSetQueueSize(audio_config, this->spec.samples * 2) >=
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171 0)
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172 && (alSetChannels(audio_config, this->spec.channels) >=
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173 0)) {
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174
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175 this->hidden->audio_port = alOpenPort("SDL audio", "w",
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176 audio_config);
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177 if (this->hidden->audio_port == NULL) {
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178 /* docs say AL_BAD_CHANNELS happens here, too. */
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179 int err = oserror();
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180 if (err == AL_BAD_CHANNELS) {
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181 this->spec.channels = 2;
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182 alSetChannels(audio_config, this->spec.channels);
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183 this->hidden->audio_port =
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184 alOpenPort("SDL audio", "w", audio_config);
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185 }
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186 }
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187
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188 if (this->hidden->audio_port != NULL) {
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189 valid = 1;
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190 }
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191 }
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192
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193 alFreeConfig(audio_config);
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194 }
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195 }
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196 }
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197
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198 if (!valid) {
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199 IRIXAUDIO_CloseDevice(this);
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200 SDL_SetError("Unsupported audio format");
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201 return 0;
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202 }
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203
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204 /* Update the fragment size as size in bytes */
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205 SDL_CalculateAudioSpec(&this->spec);
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206
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207 /* Allocate mixing buffer */
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208 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->spec.size);
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209 if (this->hidden->mixbuf == NULL) {
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210 IRIXAUDIO_CloseDevice(this);
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211 SDL_OutOfMemory();
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212 return 0;
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213 }
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214 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
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215
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216 /* We're ready to rock and roll. :-) */
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217 return 1;
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218 }
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219
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220 static int
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221 IRIXAUDIO_Init(SDL_AudioDriverImpl * impl)
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222 {
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223 /* Set the function pointers */
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224 impl->OpenDevice = DSP_OpenDevice;
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225 impl->PlayDevice = DSP_PlayDevice;
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226 impl->WaitDevice = DSP_WaitDevice;
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227 impl->GetDeviceBuf = DSP_GetDeviceBuf;
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228 impl->CloseDevice = DSP_CloseDevice;
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229 impl->OnlyHasDefaultOutputDevice = 1; /* !!! FIXME: not true, I think. */
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230
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231 return 1;
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232 }
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233
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234 AudioBootStrap IRIXAUDIO_bootstrap = {
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235 "AL", "IRIX DMedia audio", IRIXAUDIO_Init, 0
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236 };
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237
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238 /* vi: set ts=4 sw=4 expandtab: */