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annotate src/audio/sun/SDL_sunaudio.c @ 1895:c121d94672cb

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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 10 Jul 2006 21:04:37 +0000
parents af30090c0330
children 152dcc2f089f
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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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 */
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25
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26 #include <fcntl.h>
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27 #include <errno.h>
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28 #ifdef __NETBSD__
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29 #include <sys/ioctl.h>
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30 #include <sys/audioio.h>
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31 #endif
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32 #ifdef __SVR4
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33 #include <sys/audioio.h>
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34 #else
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35 #include <sys/time.h>
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36 #include <sys/types.h>
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37 #endif
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38 #include <unistd.h>
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39
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40 #include "SDL_timer.h"
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41 #include "SDL_audio.h"
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42 #include "../SDL_audiomem.h"
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43 #include "../SDL_audio_c.h"
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44 #include "../SDL_audiodev_c.h"
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45 #include "SDL_sunaudio.h"
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46
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47 /* Open the audio device for playback, and don't block if busy */
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48 #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK)
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49
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50 /* Audio driver functions */
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51 static int DSP_OpenAudio(_THIS, SDL_AudioSpec * spec);
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52 static void DSP_WaitAudio(_THIS);
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53 static void DSP_PlayAudio(_THIS);
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54 static Uint8 *DSP_GetAudioBuf(_THIS);
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55 static void DSP_CloseAudio(_THIS);
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56
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57 static Uint8 snd2au(int sample);
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58
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59 /* Audio driver bootstrap functions */
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60
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61 static int
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62 Audio_Available(void)
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63 {
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64 int fd;
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65 int available;
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66
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67 available = 0;
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68 fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 1);
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69 if (fd >= 0) {
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70 available = 1;
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71 close(fd);
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72 }
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73 return (available);
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74 }
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75
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76 static void
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77 Audio_DeleteDevice(SDL_AudioDevice * device)
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78 {
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79 SDL_free(device->hidden);
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80 SDL_free(device);
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81 }
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82
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83 static SDL_AudioDevice *
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84 Audio_CreateDevice(int devindex)
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85 {
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86 SDL_AudioDevice *this;
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87
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88 /* Initialize all variables that we clean on shutdown */
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89 this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
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90 if (this) {
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91 SDL_memset(this, 0, (sizeof *this));
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92 this->hidden = (struct SDL_PrivateAudioData *)
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93 SDL_malloc((sizeof *this->hidden));
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94 }
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95 if ((this == NULL) || (this->hidden == NULL)) {
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96 SDL_OutOfMemory();
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97 if (this) {
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98 SDL_free(this);
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99 }
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100 return (0);
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101 }
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102 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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103 audio_fd = -1;
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104
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105 /* Set the function pointers */
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106 this->OpenAudio = DSP_OpenAudio;
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107 this->WaitAudio = DSP_WaitAudio;
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108 this->PlayAudio = DSP_PlayAudio;
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109 this->GetAudioBuf = DSP_GetAudioBuf;
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110 this->CloseAudio = DSP_CloseAudio;
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111
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112 this->free = Audio_DeleteDevice;
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113
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114 return this;
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115 }
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116
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117 AudioBootStrap SUNAUDIO_bootstrap = {
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118 "audio", "UNIX /dev/audio interface",
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119 Audio_Available, Audio_CreateDevice
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120 };
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121
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122 #ifdef DEBUG_AUDIO
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123 void
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124 CheckUnderflow(_THIS)
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125 {
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126 #ifdef AUDIO_GETINFO
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127 audio_info_t info;
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128 int left;
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129
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130 ioctl(audio_fd, AUDIO_GETINFO, &info);
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131 left = (written - info.play.samples);
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132 if (written && (left == 0)) {
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133 fprintf(stderr, "audio underflow!\n");
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134 }
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135 #endif
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136 }
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137 #endif
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138
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139 void
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140 DSP_WaitAudio(_THIS)
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141 {
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142 #ifdef AUDIO_GETINFO
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143 #define SLEEP_FUDGE 10 /* 10 ms scheduling fudge factor */
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144 audio_info_t info;
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145 Sint32 left;
0
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146
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147 ioctl(audio_fd, AUDIO_GETINFO, &info);
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148 left = (written - info.play.samples);
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149 if (left > fragsize) {
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150 Sint32 sleepy;
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151
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152 sleepy = ((left - fragsize) / frequency);
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153 sleepy -= SLEEP_FUDGE;
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154 if (sleepy > 0) {
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155 SDL_Delay(sleepy);
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156 }
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157 }
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158 #else
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159 fd_set fdset;
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160
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161 FD_ZERO(&fdset);
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162 FD_SET(audio_fd, &fdset);
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163 select(audio_fd + 1, NULL, &fdset, NULL, NULL);
0
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164 #endif
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165 }
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166
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167 void
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168 DSP_PlayAudio(_THIS)
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169 {
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170 /* Write the audio data */
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171 if (ulaw_only) {
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172 /* Assuming that this->spec.freq >= 8000 Hz */
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173 int accum, incr, pos;
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174 Uint8 *aubuf;
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175
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176 accum = 0;
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177 incr = this->spec.freq / 8;
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178 aubuf = ulaw_buf;
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179 switch (audio_fmt & 0xFF) {
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180 case 8:
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Sam Lantinga <slouken@libsdl.org>
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181 {
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182 Uint8 *sndbuf;
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183
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184 sndbuf = mixbuf;
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185 for (pos = 0; pos < fragsize; ++pos) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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186 *aubuf = snd2au((0x80 - *sndbuf) * 64);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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187 accum += incr;
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188 while (accum > 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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189 accum -= 1000;
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190 sndbuf += 1;
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191 }
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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192 aubuf += 1;
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
193 }
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
194 }
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
195 break;
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
196 case 16:
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diff changeset
197 {
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198 Sint16 *sndbuf;
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199
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200 sndbuf = (Sint16 *) mixbuf;
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201 for (pos = 0; pos < fragsize; ++pos) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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202 *aubuf = snd2au(*sndbuf / 4);
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203 accum += incr;
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parents: 1464
diff changeset
204 while (accum > 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
205 accum -= 1000;
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
206 sndbuf += 1;
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
207 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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208 aubuf += 1;
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
209 }
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
210 }
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
211 break;
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
212 }
0
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213 #ifdef DEBUG_AUDIO
1895
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214 CheckUnderflow(this);
0
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215 #endif
1895
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216 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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217 /* Assume fatal error, for now */
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218 this->enabled = 0;
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
219 }
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
220 written += fragsize;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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221 } else {
0
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222 #ifdef DEBUG_AUDIO
1895
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223 CheckUnderflow(this);
0
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224 #endif
1895
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225 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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226 /* 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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diff changeset
227 this->enabled = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
228 }
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
229 written += fragsize;
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diff changeset
230 }
0
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231 }
74212992fb08 Initial revision
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232
1895
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233 Uint8 *
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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234 DSP_GetAudioBuf(_THIS)
0
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235 {
1895
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236 return (mixbuf);
0
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diff changeset
237 }
74212992fb08 Initial revision
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238
1895
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diff changeset
239 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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diff changeset
240 DSP_CloseAudio(_THIS)
0
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diff changeset
241 {
1895
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diff changeset
242 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
243 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
244 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
245 }
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
246 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
247 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
248 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>
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diff changeset
249 }
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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250 close(audio_fd);
0
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parents:
diff changeset
251 }
74212992fb08 Initial revision
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diff changeset
252
1895
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
253 int
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
254 DSP_OpenAudio(_THIS, SDL_AudioSpec * spec)
0
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parents:
diff changeset
255 {
1895
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diff changeset
256 char audiodev[1024];
0
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diff changeset
257 #ifdef AUDIO_SETINFO
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
258 int enc;
0
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diff changeset
259 #endif
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
260 int desired_freq = spec->freq;
0
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diff changeset
261
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
262 /* 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
263 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
264 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
265 ulaw_buf = NULL;
0
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diff changeset
266
1895
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
267 /* Determine the audio parameters from the AudioSpec */
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 switch (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
269
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
270 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
271 { /* 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
272 spec->format = AUDIO_U8;
0
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diff changeset
273 #ifdef AUDIO_SETINFO
1895
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
274 enc = AUDIO_ENCODING_LINEAR8;
0
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diff changeset
275 #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
276 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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277 break;
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278
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diff changeset
279 case 16:
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diff changeset
280 { /* Signed 16 bit audio data */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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281 spec->format = AUDIO_S16SYS;
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282 #ifdef AUDIO_SETINFO
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283 enc = AUDIO_ENCODING_LINEAR;
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284 #endif
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
285 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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286 break;
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287
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diff changeset
288 default:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
289 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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290 SDL_SetError("Unsupported audio format");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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291 return (-1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1464
diff changeset
292 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
293 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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294 audio_fmt = spec->format;
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295
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diff changeset
296 /* Open the audio device */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
297 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.
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diff changeset
298 if (audio_fd < 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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299 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.
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300 return (-1);
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parents: 1464
diff changeset
301 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1464
diff changeset
302
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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303 ulaw_only = 0; /* modern Suns do support linear audio */
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304 #ifdef AUDIO_SETINFO
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diff changeset
305 for (;;) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
306 audio_info_t info;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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307 AUDIO_INITINFO(&info); /* init all fields to "no change" */
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308
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diff changeset
309 /* Try to set the requested settings */
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diff changeset
310 info.play.sample_rate = spec->freq;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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311 info.play.channels = spec->channels;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
312 info.play.precision = (enc == AUDIO_ENCODING_ULAW)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
313 ? 8 : spec->format & 0xff;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
314 info.play.encoding = enc;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
315 if (ioctl(audio_fd, AUDIO_SETINFO, &info) == 0) {
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316
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diff changeset
317 /* 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.
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diff changeset
318 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.
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319 SDL_SetError("Error getting audio parameters: %s",
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
320 strerror(errno));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
321 return -1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1464
diff changeset
322 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
323 if (info.play.encoding == enc
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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324 && info.play.precision == (spec->format & 0xff)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
325 && info.play.channels == spec->channels) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
326 /* Yow! All seems to be well! */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
327 spec->freq = info.play.sample_rate;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
328 break;
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Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
329 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
330 }
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331
1895
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diff changeset
332 switch (enc) {
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diff changeset
333 case AUDIO_ENCODING_LINEAR8:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
334 /* unsigned 8bit apparently not supported here */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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335 enc = AUDIO_ENCODING_LINEAR;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
336 spec->format = AUDIO_S16SYS;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
337 break; /* try again */
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diff changeset
338
1895
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diff changeset
339 case AUDIO_ENCODING_LINEAR:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1464
diff changeset
340 /* 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.
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parents: 1464
diff changeset
341 enc = AUDIO_ENCODING_ULAW;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
342 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>
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diff changeset
343 spec->freq = 8000;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
344 spec->format = AUDIO_U8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1464
diff changeset
345 ulaw_only = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1464
diff changeset
346 break;
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
347
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
348 default:
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
349 /* oh well... */
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
350 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>
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diff changeset
351 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
352 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
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 }
0
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diff changeset
355 #endif /* AUDIO_SETINFO */
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
356 written = 0;
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diff changeset
357
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
358 /* 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
359 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
360 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
361 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
362 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
363 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
364 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
365 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
366 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
367 }
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 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
369 } 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
370 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
371 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
372 }
0
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diff changeset
373 #ifdef DEBUG_AUDIO
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
374 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
375 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
376 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>
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diff changeset
377 spec->format, spec->channels, spec->freq);
0
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diff changeset
378 #endif
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diff changeset
379
1895
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diff changeset
380 /* 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>
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diff changeset
381 SDL_CalculateAudioSpec(spec);
0
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diff changeset
382
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
383 /* 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
384 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
385 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
386 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
387 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
388 }
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 SDL_memset(mixbuf, spec->silence, spec->size);
0
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diff changeset
390
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
391 /* 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
392 return (0);
0
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parents:
diff changeset
393 }
74212992fb08 Initial revision
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parents:
diff changeset
394
74212992fb08 Initial revision
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parents:
diff changeset
395 /************************************************************************/
74212992fb08 Initial revision
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parents:
diff changeset
396 /* This function (snd2au()) copyrighted: */
74212992fb08 Initial revision
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parents:
diff changeset
397 /************************************************************************/
74212992fb08 Initial revision
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parents:
diff changeset
398 /* Copyright 1989 by Rich Gopstein and Harris Corporation */
74212992fb08 Initial revision
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parents:
diff changeset
399 /* */
74212992fb08 Initial revision
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parents:
diff changeset
400 /* Permission to use, copy, modify, and distribute this software */
74212992fb08 Initial revision
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parents:
diff changeset
401 /* and its documentation for any purpose and without fee is */
74212992fb08 Initial revision
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parents:
diff changeset
402 /* hereby granted, provided that the above copyright notice */
74212992fb08 Initial revision
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parents:
diff changeset
403 /* appears in all copies and that both that copyright notice and */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
404 /* this permission notice appear in supporting documentation, and */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
405 /* that the name of Rich Gopstein and Harris Corporation not be */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
406 /* used in advertising or publicity pertaining to distribution */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
407 /* of the software without specific, written prior permission. */
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408 /* Rich Gopstein and Harris Corporation make no representations */
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409 /* about the suitability of this software for any purpose. It */
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410 /* provided "as is" without express or implied warranty. */
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411 /************************************************************************/
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412
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413 static Uint8
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414 snd2au(int sample)
0
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415 {
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416
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417 int mask;
0
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418
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419 if (sample < 0) {
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420 sample = -sample;
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421 mask = 0x7f;
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422 } else {
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423 mask = 0xff;
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424 }
0
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425
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426 if (sample < 32) {
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427 sample = 0xF0 | (15 - sample / 2);
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428 } else if (sample < 96) {
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429 sample = 0xE0 | (15 - (sample - 32) / 4);
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430 } else if (sample < 224) {
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431 sample = 0xD0 | (15 - (sample - 96) / 8);
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432 } else if (sample < 480) {
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433 sample = 0xC0 | (15 - (sample - 224) / 16);
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434 } else if (sample < 992) {
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435 sample = 0xB0 | (15 - (sample - 480) / 32);
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436 } else if (sample < 2016) {
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437 sample = 0xA0 | (15 - (sample - 992) / 64);
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438 } else if (sample < 4064) {
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439 sample = 0x90 | (15 - (sample - 2016) / 128);
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440 } else if (sample < 8160) {
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441 sample = 0x80 | (15 - (sample - 4064) / 256);
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442 } else {
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443 sample = 0x80;
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444 }
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445 return (mask & sample);
0
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446 }
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447
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448 /* vi: set ts=4 sw=4 expandtab: */