Mercurial > sdl-ios-xcode

annotate src/audio/dmedia/SDL_irixaudio.c @ 4142:4433ef2a1802 SDL-1.2

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We probably want to still do this for fullscreen surfaces, since we may be clearing the edges of a centered video mode or garbage left over from a mode switch.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 29 Feb 2008 14:01:45 +0000
parents 5b5e549382b3
children a1b03ba2fcd0
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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 "SDL_config.h"
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23
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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 Audio_Available(void)
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57 {
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58 return 1;
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59 }
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60
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61 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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62 {
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63 SDL_free(device->hidden);
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64 SDL_free(device);
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65 }
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66
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67 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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68 {
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69 SDL_AudioDevice *this;
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70
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71 /* Initialize all variables that we clean on shutdown */
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72 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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73 if ( this ) {
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74 SDL_memset(this, 0, (sizeof *this));
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75 this->hidden = (struct SDL_PrivateAudioData *)
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76 SDL_malloc((sizeof *this->hidden));
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77 }
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78 if ( (this == NULL) || (this->hidden == NULL) ) {
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79 SDL_OutOfMemory();
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80 if ( this ) {
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81 SDL_free(this);
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82 }
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83 return(0);
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84 }
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85 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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86
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87 /* Set the function pointers */
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88 this->OpenAudio = AL_OpenAudio;
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89 this->WaitAudio = AL_WaitAudio;
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90 this->PlayAudio = AL_PlayAudio;
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91 this->GetAudioBuf = AL_GetAudioBuf;
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92 this->CloseAudio = AL_CloseAudio;
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93
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94 this->free = Audio_DeleteDevice;
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95
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96 return this;
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97 }
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98
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99 AudioBootStrap DMEDIA_bootstrap = {
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100 "AL", "IRIX DMedia audio",
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101 Audio_Available, Audio_CreateDevice
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102 };
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103
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104
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105 void static AL_WaitAudio(_THIS)
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106 {
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107 Sint32 timeleft;
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108
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109 timeleft = this->spec.samples - alGetFillable(audio_port);
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110 if ( timeleft > 0 ) {
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111 timeleft /= (this->spec.freq/1000);
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112 SDL_Delay((Uint32)timeleft);
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113 }
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114 }
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115
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116 static void AL_PlayAudio(_THIS)
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117 {
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118 /* Write the audio data out */
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119 if ( alWriteFrames(audio_port, mixbuf, this->spec.samples) < 0 ) {
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120 /* Assume fatal error, for now */
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121 this->enabled = 0;
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122 }
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123 }
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124
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125 static Uint8 *AL_GetAudioBuf(_THIS)
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126 {
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127 return(mixbuf);
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128 }
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129
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130 static void AL_CloseAudio(_THIS)
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131 {
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132 if ( mixbuf != NULL ) {
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133 SDL_FreeAudioMem(mixbuf);
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134 mixbuf = NULL;
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135 }
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136 if ( audio_port != NULL ) {
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137 alClosePort(audio_port);
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138 audio_port = NULL;
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139 }
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140 }
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141
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142 static int AL_OpenAudio(_THIS, SDL_AudioSpec * spec)
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143 {
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144 Uint16 test_format = SDL_FirstAudioFormat(spec->format);
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145 long width = 0;
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146 long fmt = 0;
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147 int valid = 0;
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148
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149 #ifdef OLD_IRIX_AUDIO
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150 {
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151 long audio_param[2];
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152 audio_param[0] = AL_OUTPUT_RATE;
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153 audio_param[1] = spec->freq;
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154 valid = (ALsetparams(AL_DEFAULT_DEVICE, audio_param, 2) < 0);
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155 }
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156 #else
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157 {
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158 ALpv audio_param;
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159 audio_param.param = AL_RATE;
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160 audio_param.value.i = spec->freq;
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161 valid = (alSetParams(AL_DEFAULT_OUTPUT, &audio_param, 1) < 0);
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162 }
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163 #endif
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164
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165 while ((!valid) && (test_format)) {
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166 valid = 1;
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167 spec->format = test_format;
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168
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169 switch (test_format) {
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170 case AUDIO_S8:
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171 width = AL_SAMPLE_8;
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172 fmt = AL_SAMPFMT_TWOSCOMP;
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173 break;
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174
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175 case AUDIO_S16SYS:
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176 width = AL_SAMPLE_16;
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177 fmt = AL_SAMPFMT_TWOSCOMP;
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178 break;
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179
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180 default:
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181 valid = 0;
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182 test_format = SDL_NextAudioFormat();
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183 break;
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184 }
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185
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186 if (valid) {
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187 ALconfig audio_config = alNewConfig();
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188 valid = 0;
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189 if (audio_config) {
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190 if (alSetChannels(audio_config, spec->channels) < 0) {
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191 if (spec->channels > 2) { /* can't handle > stereo? */
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192 spec->channels = 2; /* try again below. */
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193 }
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194 }
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195
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196 if ((alSetSampFmt(audio_config, fmt) >= 0) &&
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197 ((!width) || (alSetWidth(audio_config, width) >= 0)) &&
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198 (alSetQueueSize(audio_config, spec->samples * 2) >= 0) &&
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199 (alSetChannels(audio_config, spec->channels) >= 0)) {
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200
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201 audio_port = alOpenPort("SDL audio", "w", audio_config);
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202 if (audio_port == NULL) {
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203 /* docs say AL_BAD_CHANNELS happens here, too. */
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204 int err = oserror();
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205 if (err == AL_BAD_CHANNELS) {
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206 spec->channels = 2;
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207 alSetChannels(audio_config, spec->channels);
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208 audio_port = alOpenPort("SDL audio", "w",
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209 audio_config);
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210 }
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211 }
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212
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213 if (audio_port != NULL) {
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214 valid = 1;
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215 }
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216 }
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217
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218 alFreeConfig(audio_config);
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219 }
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220 }
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221 }
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222
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223 if (!valid) {
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224 SDL_SetError("Unsupported audio format");
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225 return (-1);
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226 }
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227
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228 /* Update the fragment size as size in bytes */
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229 SDL_CalculateAudioSpec(spec);
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230
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231 /* Allocate mixing buffer */
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232 mixbuf = (Uint8 *) SDL_AllocAudioMem(spec->size);
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233 if (mixbuf == NULL) {
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234 SDL_OutOfMemory();
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235 return (-1);
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236 }
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237 SDL_memset(mixbuf, spec->silence, spec->size);
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238
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239 /* We're ready to rock and roll. :-) */
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240 return (0);
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241 }
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242