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annotate src/audio/sun/SDL_sunaudio.c @ 5018:342b158efbbe

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Michael gave permission to use his test code
author Sam Lantinga <slouken@libsdl.org>
date Tue, 18 Jan 2011 10:57:28 -0800
parents f7b03b6838cb
children b530ef003506
rev   line source
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2015
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1 /* I'm gambling no one uses this audio backend...we'll see who emails. :) */
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parents: 2015
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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) 1997-2010 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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parents:
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141 }
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parents:
diff changeset
142 #endif
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143
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diff changeset
144 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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145 DSP_WaitAudio(_THIS)
0
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parents:
diff changeset
146 {
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147 #ifdef AUDIO_GETINFO
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148 #define SLEEP_FUDGE 10 /* 10 ms scheduling fudge factor */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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149 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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150 Sint32 left;
0
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151
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diff changeset
152 ioctl(audio_fd, AUDIO_GETINFO, &info);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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153 left = (written - info.play.samples);
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
154 if (left > fragsize) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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155 Sint32 sleepy;
0
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156
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diff changeset
157 sleepy = ((left - fragsize) / frequency);
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
158 sleepy -= SLEEP_FUDGE;
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
159 if (sleepy > 0) {
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
160 SDL_Delay(sleepy);
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
161 }
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
162 }
0
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163 #else
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164 fd_set fdset;
0
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165
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166 FD_ZERO(&fdset);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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167 FD_SET(audio_fd, &fdset);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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168 select(audio_fd + 1, NULL, &fdset, NULL, NULL);
0
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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)
0
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174 {
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175 /* Write the audio data */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
176 if (ulaw_only) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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177 /* Assuming that this->spec.freq >= 8000 Hz */
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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178 int accum, incr, pos;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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179 Uint8 *aubuf;
0
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180
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181 accum = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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182 incr = this->spec.freq / 8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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183 aubuf = 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
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184 switch (audio_fmt & 0xFF) {
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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185 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
186 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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187 Uint8 *sndbuf;
0
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188
1895
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189 sndbuf = 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
190 for (pos = 0; pos < fragsize; ++pos) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
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191 *aubuf = snd2au((0x80 - *sndbuf) * 64);
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
192 accum += incr;
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
193 while (accum > 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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194 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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195 sndbuf += 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
196 }
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
197 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
198 }
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
199 }
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
200 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
201 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
202 {
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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203 Sint16 *sndbuf;
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
204
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
205 sndbuf = (Sint16 *) mixbuf;
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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206 for (pos = 0; pos < fragsize; ++pos) {
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
207 *aubuf = snd2au(*sndbuf / 4);
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
208 accum += incr;
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
209 while (accum > 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
210 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
211 sndbuf += 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
212 }
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
213 aubuf += 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
214 }
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
215 }
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
216 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
217 }
0
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diff changeset
218 #ifdef DEBUG_AUDIO
1895
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219 CheckUnderflow(this);
0
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diff changeset
220 #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
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.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
222 /* Assume fatal error, for now */
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
223 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>
parents: 1464
diff changeset
224 }
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
225 written += 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
226 } else {
0
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diff changeset
227 #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>
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228 CheckUnderflow(this);
0
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229 #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
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.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
diff changeset
231 /* Assume fatal error, for now */
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
232 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>
parents: 1464
diff changeset
233 }
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
234 written += 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
235 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
236 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
237
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
238 Uint8 *
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
239 DSP_GetAudioBuf(_THIS)
0
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parents:
diff changeset
240 {
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
241 return (mixbuf);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
242 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
243
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
244 void
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 DSP_CloseAudio(_THIS)
0
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parents:
diff changeset
246 {
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
247 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
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>
parents: 1464
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>
parents: 1464
diff changeset
255 close(audio_fd);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
256 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
257
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
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
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
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>
parents: 1464
diff changeset
261 char audiodev[1024];
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
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
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
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>
parents: 1464
diff changeset
265 int desired_freq = spec->freq;
0
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Sam Lantinga <slouken@lokigames.com>
parents:
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>
parents: 1464
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>
parents: 1464
diff changeset
270 ulaw_buf = NULL;
0
74212992fb08 Initial revision
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parents:
diff changeset
271
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
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.
Sam Lantinga <slouken@libsdl.org>
parents: 1464
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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diff changeset
278 #ifdef AUDIO_SETINFO
1895
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diff changeset
279 enc = AUDIO_ENCODING_LINEAR8;
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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.
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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;
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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 */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
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: */