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annotate src/audio/sun/SDL_sunaudio.c @ 3844:332a59e39ce1 SDL-ryan-multiple-audio-device

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I really don't want to update these last two audio backends...I added an error that says if no one complains, the backends will be removed eventually. So if anyone ever wants them and they care enough to speak up, we'll know to do something about it. If no one does, that's less code to maintain. :)
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 17 Oct 2006 06:45:17 +0000
parents c8b3d3d13ed1
children
rev   line source
3844
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1 /* I'm gambling no one uses this audio backend...we'll see who emails. :) */
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2 #error this code has not been updated for SDL 1.3.
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3 #error if no one emails icculus at icculus.org and tells him that this
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4 #error code is needed, this audio backend will eventually be removed from SDL.
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5
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6 /*
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7 SDL - Simple DirectMedia Layer
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8 Copyright (C) 1997-2006 Sam Lantinga
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9
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10 This library is free software; you can redistribute it and/or
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11 modify it under the terms of the GNU Lesser General Public
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12 License as published by the Free Software Foundation; either
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13 version 2.1 of the License, or (at your option) any later version.
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14
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15 This library is distributed in the hope that it will be useful,
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16 but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 Lesser General Public License for more details.
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19
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20 You should have received a copy of the GNU Lesser General Public
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21 License along with this library; if not, write to the Free Software
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22 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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23
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24 Sam Lantinga
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25 slouken@libsdl.org
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26 */
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27 #include "SDL_config.h"
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28
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29 /* Allow access to a raw mixing buffer */
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30
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31 #include <fcntl.h>
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32 #include <errno.h>
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33 #ifdef __NETBSD__
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34 #include <sys/ioctl.h>
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35 #include <sys/audioio.h>
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36 #endif
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37 #ifdef __SVR4
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38 #include <sys/audioio.h>
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39 #else
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40 #include <sys/time.h>
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41 #include <sys/types.h>
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42 #endif
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43 #include <unistd.h>
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44
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45 #include "SDL_timer.h"
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46 #include "SDL_audio.h"
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47 #include "../SDL_audiomem.h"
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48 #include "../SDL_audio_c.h"
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49 #include "../SDL_audiodev_c.h"
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50 #include "SDL_sunaudio.h"
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51
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52 /* Open the audio device for playback, and don't block if busy */
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53 #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK)
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54
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55 /* Audio driver functions */
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56 static int DSP_OpenAudio(_THIS, SDL_AudioSpec * spec);
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57 static void DSP_WaitAudio(_THIS);
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58 static void DSP_PlayAudio(_THIS);
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59 static Uint8 *DSP_GetAudioBuf(_THIS);
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60 static void DSP_CloseAudio(_THIS);
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61
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62 static Uint8 snd2au(int sample);
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63
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64 /* Audio driver bootstrap functions */
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65
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66 static int
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67 Audio_Available(void)
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68 {
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69 int fd;
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70 int available;
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71
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72 available = 0;
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73 fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 1);
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74 if (fd >= 0) {
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75 available = 1;
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76 close(fd);
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77 }
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78 return (available);
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79 }
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80
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81 static void
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82 Audio_DeleteDevice(SDL_AudioDevice * device)
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83 {
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84 SDL_free(device->hidden);
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85 SDL_free(device);
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86 }
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87
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88 static SDL_AudioDevice *
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89 Audio_CreateDevice(int devindex)
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90 {
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91 SDL_AudioDevice *this;
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92
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93 /* Initialize all variables that we clean on shutdown */
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94 this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
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95 if (this) {
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96 SDL_memset(this, 0, (sizeof *this));
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97 this->hidden = (struct SDL_PrivateAudioData *)
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98 SDL_malloc((sizeof *this->hidden));
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99 }
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100 if ((this == NULL) || (this->hidden == NULL)) {
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101 SDL_OutOfMemory();
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102 if (this) {
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103 SDL_free(this);
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104 }
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105 return (0);
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106 }
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107 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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108 audio_fd = -1;
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109
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110 /* Set the function pointers */
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111 this->OpenAudio = DSP_OpenAudio;
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112 this->WaitAudio = DSP_WaitAudio;
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113 this->PlayAudio = DSP_PlayAudio;
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114 this->GetAudioBuf = DSP_GetAudioBuf;
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115 this->CloseAudio = DSP_CloseAudio;
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116
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117 this->free = Audio_DeleteDevice;
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118
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119 return this;
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120 }
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121
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122 AudioBootStrap SUNAUDIO_bootstrap = {
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123 "audio", "UNIX /dev/audio interface",
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124 Audio_Available, Audio_CreateDevice, 0
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125 };
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126
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127 #ifdef DEBUG_AUDIO
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128 void
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129 CheckUnderflow(_THIS)
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130 {
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131 #ifdef AUDIO_GETINFO
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132 audio_info_t info;
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133 int left;
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134
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135 ioctl(audio_fd, AUDIO_GETINFO, &info);
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136 left = (written - info.play.samples);
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137 if (written && (left == 0)) {
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138 fprintf(stderr, "audio underflow!\n");
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139 }
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140 #endif
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141 }
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142 #endif
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143
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144 void
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145 DSP_WaitAudio(_THIS)
0
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146 {
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147 #ifdef AUDIO_GETINFO
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148 #define SLEEP_FUDGE 10 /* 10 ms scheduling fudge factor */
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149 audio_info_t info;
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150 Sint32 left;
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151
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152 ioctl(audio_fd, AUDIO_GETINFO, &info);
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153 left = (written - info.play.samples);
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154 if (left > fragsize) {
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155 Sint32 sleepy;
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156
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157 sleepy = ((left - fragsize) / frequency);
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158 sleepy -= SLEEP_FUDGE;
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159 if (sleepy > 0) {
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160 SDL_Delay(sleepy);
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161 }
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162 }
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163 #else
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164 fd_set fdset;
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165
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166 FD_ZERO(&fdset);
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167 FD_SET(audio_fd, &fdset);
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168 select(audio_fd + 1, NULL, &fdset, NULL, NULL);
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169 #endif
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170 }
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171
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172 void
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173 DSP_PlayAudio(_THIS)
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174 {
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175 /* Write the audio data */
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176 if (ulaw_only) {
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177 /* Assuming that this->spec.freq >= 8000 Hz */
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178 int accum, incr, pos;
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179 Uint8 *aubuf;
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180
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181 accum = 0;
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182 incr = this->spec.freq / 8;
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183 aubuf = ulaw_buf;
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184 switch (audio_fmt & 0xFF) {
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185 case 8:
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186 {
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187 Uint8 *sndbuf;
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188
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189 sndbuf = mixbuf;
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190 for (pos = 0; pos < fragsize; ++pos) {
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191 *aubuf = snd2au((0x80 - *sndbuf) * 64);
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192 accum += incr;
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193 while (accum > 0) {
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194 accum -= 1000;
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195 sndbuf += 1;
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196 }
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197 aubuf += 1;
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198 }
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199 }
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200 break;
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201 case 16:
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202 {
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203 Sint16 *sndbuf;
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204
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205 sndbuf = (Sint16 *) mixbuf;
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206 for (pos = 0; pos < fragsize; ++pos) {
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207 *aubuf = snd2au(*sndbuf / 4);
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208 accum += incr;
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diff changeset
209 while (accum > 0) {
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210 accum -= 1000;
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211 sndbuf += 1;
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212 }
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213 aubuf += 1;
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214 }
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215 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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216 break;
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217 }
0
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218 #ifdef DEBUG_AUDIO
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219 CheckUnderflow(this);
0
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220 #endif
1895
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221 if (write(audio_fd, ulaw_buf, fragsize) < 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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222 /* Assume fatal error, for now */
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223 this->enabled = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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224 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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225 written += fragsize;
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226 } else {
0
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227 #ifdef DEBUG_AUDIO
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228 CheckUnderflow(this);
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229 #endif
1895
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230 if (write(audio_fd, mixbuf, this->spec.size) < 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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231 /* Assume fatal error, for now */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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232 this->enabled = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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233 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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234 written += fragsize;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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235 }
0
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236 }
74212992fb08 Initial revision
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237
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238 Uint8 *
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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239 DSP_GetAudioBuf(_THIS)
0
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240 {
1895
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241 return (mixbuf);
0
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242 }
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243
1895
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diff changeset
244 void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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245 DSP_CloseAudio(_THIS)
0
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246 {
1895
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diff changeset
247 if (mixbuf != NULL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1464
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248 SDL_FreeAudioMem(mixbuf);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
249 mixbuf = NULL;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
250 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
251 if (ulaw_buf != NULL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
252 SDL_free(ulaw_buf);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
253 ulaw_buf = NULL;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
254 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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255 close(audio_fd);
0
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parents:
diff changeset
256 }
74212992fb08 Initial revision
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diff changeset
257
1895
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Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
258 int
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
259 DSP_OpenAudio(_THIS, SDL_AudioSpec * spec)
0
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parents:
diff changeset
260 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
261 char audiodev[1024];
0
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parents:
diff changeset
262 #ifdef AUDIO_SETINFO
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
263 int enc;
0
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diff changeset
264 #endif
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
265 int desired_freq = spec->freq;
0
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diff changeset
266
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
267 /* Initialize our freeable variables, in case we fail */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
268 audio_fd = -1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
269 mixbuf = NULL;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
270 ulaw_buf = NULL;
0
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diff changeset
271
1895
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
272 /* Determine the audio parameters from the AudioSpec */
2015
152dcc2f089f Added a FIXME and macro to sun audio.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
273 switch (SDL_AUDIO_BITSIZE(spec->format)) {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
274
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
275 case 8:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
276 { /* Unsigned 8 bit audio data */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
277 spec->format = AUDIO_U8;
0
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parents:
diff changeset
278 #ifdef AUDIO_SETINFO
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
279 enc = AUDIO_ENCODING_LINEAR8;
0
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parents:
diff changeset
280 #endif
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
281 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
282 break;
0
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parents:
diff changeset
283
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
284 case 16:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
285 { /* Signed 16 bit audio data */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
286 spec->format = AUDIO_S16SYS;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
287 #ifdef AUDIO_SETINFO
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
288 enc = AUDIO_ENCODING_LINEAR;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
289 #endif
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
290 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
291 break;
0
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parents:
diff changeset
292
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
293 default:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
294 {
2015
152dcc2f089f Added a FIXME and macro to sun audio.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
295 /* !!! FIXME: fallback to conversion on unsupported types! */
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
296 SDL_SetError("Unsupported audio format");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
297 return (-1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
298 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
299 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
300 audio_fmt = spec->format;
0
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diff changeset
301
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
302 /* Open the audio device */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
303 audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
304 if (audio_fd < 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
305 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
306 return (-1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
307 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
308
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
309 ulaw_only = 0; /* modern Suns do support linear audio */
0
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parents:
diff changeset
310 #ifdef AUDIO_SETINFO
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
311 for (;;) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
312 audio_info_t info;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
313 AUDIO_INITINFO(&info); /* init all fields to "no change" */
0
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parents:
diff changeset
314
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
315 /* Try to set the requested settings */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
316 info.play.sample_rate = spec->freq;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
317 info.play.channels = spec->channels;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
318 info.play.precision = (enc == AUDIO_ENCODING_ULAW)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
319 ? 8 : spec->format & 0xff;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
320 info.play.encoding = enc;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
321 if (ioctl(audio_fd, AUDIO_SETINFO, &info) == 0) {
0
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parents:
diff changeset
322
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
323 /* Check to be sure we got what we wanted */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
324 if (ioctl(audio_fd, AUDIO_GETINFO, &info) < 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
325 SDL_SetError("Error getting audio parameters: %s",
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
326 strerror(errno));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
327 return -1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
328 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
329 if (info.play.encoding == enc
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
330 && info.play.precision == (spec->format & 0xff)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
331 && info.play.channels == spec->channels) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
332 /* Yow! All seems to be well! */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
333 spec->freq = info.play.sample_rate;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
334 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
335 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
336 }
0
74212992fb08 Initial revision
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parents:
diff changeset
337
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
338 switch (enc) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
339 case AUDIO_ENCODING_LINEAR8:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
340 /* unsigned 8bit apparently not supported here */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
341 enc = AUDIO_ENCODING_LINEAR;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
342 spec->format = AUDIO_S16SYS;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
343 break; /* try again */
0
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parents:
diff changeset
344
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
345 case AUDIO_ENCODING_LINEAR:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
346 /* linear 16bit didn't work either, resort to µ-law */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
347 enc = AUDIO_ENCODING_ULAW;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
348 spec->channels = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
349 spec->freq = 8000;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
350 spec->format = AUDIO_U8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
351 ulaw_only = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
352 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
353
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
354 default:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
355 /* oh well... */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
356 SDL_SetError("Error setting audio parameters: %s",
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
357 strerror(errno));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
358 return -1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
359 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
360 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
361 #endif /* AUDIO_SETINFO */
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
362 written = 0;
0
74212992fb08 Initial revision
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parents:
diff changeset
363
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
364 /* We can actually convert on-the-fly to U-Law */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
365 if (ulaw_only) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
366 spec->freq = desired_freq;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
367 fragsize = (spec->samples * 1000) / (spec->freq / 8);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
368 frequency = 8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
369 ulaw_buf = (Uint8 *) SDL_malloc(fragsize);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
370 if (ulaw_buf == NULL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
371 SDL_OutOfMemory();
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
372 return (-1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
373 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
374 spec->channels = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
375 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
376 fragsize = spec->samples;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
377 frequency = spec->freq / 1000;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
378 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
379 #ifdef DEBUG_AUDIO
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
380 fprintf(stderr, "Audio device %s U-Law only\n",
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
381 ulaw_only ? "is" : "is not");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
382 fprintf(stderr, "format=0x%x chan=%d freq=%d\n",
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
383 spec->format, spec->channels, spec->freq);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
384 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
385
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
386 /* Update the fragment size as size in bytes */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
387 SDL_CalculateAudioSpec(spec);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
388
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
389 /* Allocate mixing buffer */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
390 mixbuf = (Uint8 *) SDL_AllocAudioMem(spec->size);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
391 if (mixbuf == NULL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
392 SDL_OutOfMemory();
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
393 return (-1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
394 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
395 SDL_memset(mixbuf, spec->silence, spec->size);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
396
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
397 /* We're ready to rock and roll. :-) */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
398 return (0);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
399 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
400
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
401 /************************************************************************/
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
402 /* This function (snd2au()) copyrighted: */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
403 /************************************************************************/
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
404 /* Copyright 1989 by Rich Gopstein and Harris Corporation */
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405 /* */
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406 /* Permission to use, copy, modify, and distribute this software */
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407 /* and its documentation for any purpose and without fee is */
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408 /* hereby granted, provided that the above copyright notice */
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409 /* appears in all copies and that both that copyright notice and */
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410 /* this permission notice appear in supporting documentation, and */
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411 /* that the name of Rich Gopstein and Harris Corporation not be */
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412 /* used in advertising or publicity pertaining to distribution */
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413 /* of the software without specific, written prior permission. */
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414 /* Rich Gopstein and Harris Corporation make no representations */
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415 /* about the suitability of this software for any purpose. It */
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416 /* provided "as is" without express or implied warranty. */
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417 /************************************************************************/
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418
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419 static Uint8
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420 snd2au(int sample)
0
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421 {
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422
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423 int mask;
0
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424
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425 if (sample < 0) {
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426 sample = -sample;
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427 mask = 0x7f;
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428 } else {
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429 mask = 0xff;
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430 }
0
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431
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432 if (sample < 32) {
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433 sample = 0xF0 | (15 - sample / 2);
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434 } else if (sample < 96) {
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435 sample = 0xE0 | (15 - (sample - 32) / 4);
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436 } else if (sample < 224) {
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437 sample = 0xD0 | (15 - (sample - 96) / 8);
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438 } else if (sample < 480) {
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439 sample = 0xC0 | (15 - (sample - 224) / 16);
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440 } else if (sample < 992) {
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441 sample = 0xB0 | (15 - (sample - 480) / 32);
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442 } else if (sample < 2016) {
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443 sample = 0xA0 | (15 - (sample - 992) / 64);
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444 } else if (sample < 4064) {
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445 sample = 0x90 | (15 - (sample - 2016) / 128);
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446 } else if (sample < 8160) {
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447 sample = 0x80 | (15 - (sample - 4064) / 256);
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448 } else {
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449 sample = 0x80;
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450 }
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451 return (mask & sample);
0
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452 }
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453
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454 /* vi: set ts=4 sw=4 expandtab: */