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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 5635-34 Springhouse Dr.
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21 Pleasanton, CA 94588 (USA)
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22 slouken@devolution.com
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23 */
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24
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25 #ifdef SAVE_RCSID
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26 static char rcsid =
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27 "@(#) $Id$";
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28 #endif
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29
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30 /* Allow access to a raw mixing buffer (For IRIX 6.5 and higher) */
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31
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32 #include <stdlib.h>
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33
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34 #include "SDL_endian.h"
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35 #include "SDL_timer.h"
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36 #include "SDL_audio.h"
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37 #include "SDL_audiomem.h"
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38 #include "SDL_audio_c.h"
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39 #include "SDL_irixaudio.h"
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40
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41
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42 /* Audio driver functions */
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43 static int AL_OpenAudio(_THIS, SDL_AudioSpec *spec);
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44 static void AL_WaitAudio(_THIS);
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45 static void AL_PlayAudio(_THIS);
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46 static Uint8 *AL_GetAudioBuf(_THIS);
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47 static void AL_CloseAudio(_THIS);
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48
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49 /* Audio driver bootstrap functions */
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50
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51 static int Audio_Available(void)
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52 {
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53 return 1;
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54 }
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55
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56 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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57 {
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58 free(device->hidden);
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59 free(device);
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60 }
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61
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62 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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63 {
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64 SDL_AudioDevice *this;
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65
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66 /* Initialize all variables that we clean on shutdown */
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67 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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68 if ( this ) {
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69 memset(this, 0, (sizeof *this));
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70 this->hidden = (struct SDL_PrivateAudioData *)
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71 malloc((sizeof *this->hidden));
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72 }
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73 if ( (this == NULL) || (this->hidden == NULL) ) {
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74 SDL_OutOfMemory();
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75 if ( this ) {
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76 free(this);
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77 }
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78 return(0);
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79 }
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80 memset(this->hidden, 0, (sizeof *this->hidden));
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81
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82 /* Set the function pointers */
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83 this->OpenAudio = AL_OpenAudio;
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84 this->WaitAudio = AL_WaitAudio;
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85 this->PlayAudio = AL_PlayAudio;
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86 this->GetAudioBuf = AL_GetAudioBuf;
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87 this->CloseAudio = AL_CloseAudio;
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88
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89 this->free = Audio_DeleteDevice;
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90
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91 return this;
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92 }
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93
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94 AudioBootStrap AUDIO_bootstrap = {
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95 "AL", "IRIX DMedia audio",
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96 Audio_Available, Audio_CreateDevice
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97 };
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98
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99
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100 void static AL_WaitAudio(_THIS)
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101 {
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102 Sint32 timeleft;
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103
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104 timeleft = this->spec.samples - alGetFillable(audio_port);
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105 if ( timeleft > 0 ) {
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106 timeleft /= (this->spec.freq/1000);
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107 SDL_Delay((Uint32)timeleft);
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108 }
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109 }
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110
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111 static void AL_PlayAudio(_THIS)
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112 {
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113 /* Write the audio data out */
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114 if ( alWriteFrames(audio_port, mixbuf, this->spec.samples) < 0 ) {
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115 /* Assume fatal error, for now */
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116 this->enabled = 0;
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117 }
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118 }
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119
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120 static Uint8 *AL_GetAudioBuf(_THIS)
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121 {
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122 return(mixbuf);
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123 }
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124
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125 static void AL_CloseAudio(_THIS)
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126 {
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127 if ( mixbuf != NULL ) {
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128 SDL_FreeAudioMem(mixbuf);
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129 mixbuf = NULL;
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130 }
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131 if ( audio_port != NULL ) {
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132 ALcloseport(audio_port);
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133 audio_port = NULL;
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134 }
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135 }
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136
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137 static int AL_OpenAudio(_THIS, SDL_AudioSpec *spec)
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138 {
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139 ALconfig audio_config;
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140 ALpv audio_param;
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141 int width;
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142
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143 /* Determine the audio parameters from the AudioSpec */
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144 switch ( spec->format & 0xFF ) {
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145
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146 case 8: { /* Signed 8 bit audio data */
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147 spec->format = AUDIO_S8;
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148 width = AL_SAMPLE_8;
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149 }
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150 break;
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151
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152 case 16: { /* Signed 16 bit audio data */
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153 spec->format = AUDIO_S16MSB;
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154 width = AL_SAMPLE_16;
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155 }
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156 break;
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157
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158 default: {
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159 SDL_SetError("Unsupported audio format");
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160 return(-1);
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161 }
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162 }
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163
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164 /* Update the fragment size as size in bytes */
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165 SDL_CalculateAudioSpec(spec);
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166
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167 /* Set output frequency */
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168 audio_param.param = AL_RATE;
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169 audio_param.value.i = spec->freq;
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170 if( alSetParams(AL_DEFAULT_OUTPUT, &audio_param, 1) < 0 ) {
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171 SDL_SetError("alSetParams failed");
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172 return(-1);
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173 }
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174
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175 /* Open the audio port with the requested frequency */
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176 audio_port = NULL;
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177 audio_config = alNewConfig();
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178 if ( audio_config &&
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179 (alSetSampFmt(audio_config, AL_SAMPFMT_TWOSCOMP) >= 0) &&
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180 (alSetWidth(audio_config, width) >= 0) &&
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181 (alSetQueueSize(audio_config, spec->samples*2) >= 0) &&
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182 (alSetChannels(audio_config, spec->channels) >= 0) ) {
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183 audio_port = ALopenport("SDL audio", "w", audio_config);
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184 }
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185 alFreeConfig(audio_config);
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186 if( audio_port == NULL ) {
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187 SDL_SetError("Unable to open audio port");
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188 return(-1);
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189 }
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190
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191 /* Allocate mixing buffer */
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192 mixbuf = (Uint8 *)SDL_AllocAudioMem(spec->size);
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193 if ( mixbuf == NULL ) {
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194 SDL_OutOfMemory();
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195 return(-1);
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196 }
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197 memset(mixbuf, spec->silence, spec->size);
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198
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199 /* We're ready to rock and roll. :-) */
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200 return(0);
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201 }
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