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annotate src/audio/dmedia/SDL_irixaudio.c @ 2697:c9121b04cffa gsoc2008_nds

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Some more work on the audio driver.
author Darren Alton <dalton@stevens.edu>
date Thu, 21 Aug 2008 12:38:21 +0000
parents 866052b01ee5
children 99210400e8b9
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 <errno.h>
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23 #include "SDL_config.h"
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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: */