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annotate src/audio/sun/SDL_sunaudio.c @ 1663:11775724e3fe SDL-1.3

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fine tuning indent output
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:29:03 +0000
parents 782fd950bd46
children 4da1ee79c9af
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)
0
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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;
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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);
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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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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) {
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186 *aubuf = snd2au ((0x80 - *sndbuf) * 64);
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187 accum += incr;
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188 while (accum > 0) {
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189 accum -= 1000;
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190 sndbuf += 1;
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191 }
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192 aubuf += 1;
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193 }
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194 }
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195 break;
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196 case 16:
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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) {
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202 *aubuf = snd2au (*sndbuf / 4);
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203 accum += incr;
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204 while (accum > 0) {
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205 accum -= 1000;
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206 sndbuf += 1;
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207 }
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208 aubuf += 1;
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209 }
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210 }
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211 break;
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212 }
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213 #ifdef DEBUG_AUDIO
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214 CheckUnderflow (this);
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215 #endif
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216 if (write (audio_fd, ulaw_buf, fragsize) < 0) {
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217 /* Assume fatal error, for now */
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218 this->enabled = 0;
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219 }
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220 written += fragsize;
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221 } else {
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222 #ifdef DEBUG_AUDIO
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223 CheckUnderflow (this);
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224 #endif
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225 if (write (audio_fd, mixbuf, this->spec.size) < 0) {
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226 /* Assume fatal error, for now */
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227 this->enabled = 0;
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228 }
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229 written += fragsize;
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230 }
0
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231 }
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232
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233 Uint8 *
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234 DSP_GetAudioBuf (_THIS)
0
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235 {
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236 return (mixbuf);
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237 }
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238
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239 void
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240 DSP_CloseAudio (_THIS)
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241 {
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242 if (mixbuf != NULL) {
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243 SDL_FreeAudioMem (mixbuf);
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244 mixbuf = NULL;
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245 }
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diff changeset
246 if (ulaw_buf != NULL) {
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247 SDL_free (ulaw_buf);
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248 ulaw_buf = NULL;
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249 }
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diff changeset
250 close (audio_fd);
0
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diff changeset
251 }
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252
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253 int
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diff changeset
254 DSP_OpenAudio (_THIS, SDL_AudioSpec * spec)
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diff changeset
255 {
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diff changeset
256 char audiodev[1024];
0
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diff changeset
257 #ifdef AUDIO_SETINFO
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258 int enc;
0
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diff changeset
259 #endif
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260 int desired_freq = spec->freq;
0
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diff changeset
261
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262 /* Initialize our freeable variables, in case we fail */
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263 audio_fd = -1;
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264 mixbuf = NULL;
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265 ulaw_buf = NULL;
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266
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267 /* Determine the audio parameters from the AudioSpec */
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268 switch (spec->format & 0xFF) {
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269
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270 case 8:
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271 { /* Unsigned 8 bit audio data */
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272 spec->format = AUDIO_U8;
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273 #ifdef AUDIO_SETINFO
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274 enc = AUDIO_ENCODING_LINEAR8;
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275 #endif
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276 }
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277 break;
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278
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279 case 16:
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280 { /* Signed 16 bit audio data */
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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
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285 }
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286 break;
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287
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288 default:
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289 {
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290 SDL_SetError ("Unsupported audio format");
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291 return (-1);
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292 }
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293 }
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294 audio_fmt = spec->format;
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295
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296 /* Open the audio device */
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297 audio_fd = SDL_OpenAudioPath (audiodev, sizeof (audiodev), OPEN_FLAGS, 1);
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298 if (audio_fd < 0) {
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299 SDL_SetError ("Couldn't open %s: %s", audiodev, strerror (errno));
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300 return (-1);
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301 }
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302
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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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305 for (;;) {
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306 audio_info_t info;
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307 AUDIO_INITINFO (&info); /* init all fields to "no change" */
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308
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309 /* Try to set the requested settings */
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310 info.play.sample_rate = spec->freq;
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311 info.play.channels = spec->channels;
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312 info.play.precision = (enc == AUDIO_ENCODING_ULAW)
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313 ? 8 : spec->format & 0xff;
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314 info.play.encoding = enc;
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315 if (ioctl (audio_fd, AUDIO_SETINFO, &info) == 0) {
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316
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317 /* Check to be sure we got what we wanted */
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318 if (ioctl (audio_fd, AUDIO_GETINFO, &info) < 0) {
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319 SDL_SetError ("Error getting audio parameters: %s",
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320 strerror (errno));
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321 return -1;
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322 }
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323 if (info.play.encoding == enc
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324 && info.play.precision == (spec->format & 0xff)
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325 && info.play.channels == spec->channels) {
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326 /* Yow! All seems to be well! */
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327 spec->freq = info.play.sample_rate;
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328 break;
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329 }
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330 }
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331
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332 switch (enc) {
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333 case AUDIO_ENCODING_LINEAR8:
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334 /* unsigned 8bit apparently not supported here */
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335 enc = AUDIO_ENCODING_LINEAR;
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336 spec->format = AUDIO_S16SYS;
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337 break; /* try again */
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338
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339 case AUDIO_ENCODING_LINEAR:
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340 /* linear 16bit didn't work either, resort to µ-law */
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341 enc = AUDIO_ENCODING_ULAW;
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342 spec->channels = 1;
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343 spec->freq = 8000;
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344 spec->format = AUDIO_U8;
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345 ulaw_only = 1;
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diff changeset
346 break;
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347
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348 default:
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349 /* oh well... */
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diff changeset
350 SDL_SetError ("Error setting audio parameters: %s",
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351 strerror (errno));
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352 return -1;
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353 }
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354 }
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355 #endif /* AUDIO_SETINFO */
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356 written = 0;
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357
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358 /* We can actually convert on-the-fly to U-Law */
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359 if (ulaw_only) {
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diff changeset
360 spec->freq = desired_freq;
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361 fragsize = (spec->samples * 1000) / (spec->freq / 8);
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362 frequency = 8;
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363 ulaw_buf = (Uint8 *) SDL_malloc (fragsize);
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diff changeset
364 if (ulaw_buf == NULL) {
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diff changeset
365 SDL_OutOfMemory ();
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366 return (-1);
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diff changeset
367 }
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diff changeset
368 spec->channels = 1;
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369 } else {
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diff changeset
370 fragsize = spec->samples;
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371 frequency = spec->freq / 1000;
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diff changeset
372 }
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diff changeset
373 #ifdef DEBUG_AUDIO
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374 fprintf (stderr, "Audio device %s U-Law only\n",
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diff changeset
375 ulaw_only ? "is" : "is not");
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diff changeset
376 fprintf (stderr, "format=0x%x chan=%d freq=%d\n",
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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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379
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diff changeset
380 /* Update the fragment size as size in bytes */
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diff changeset
381 SDL_CalculateAudioSpec (spec);
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diff changeset
382
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383 /* Allocate mixing buffer */
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384 mixbuf = (Uint8 *) SDL_AllocAudioMem (spec->size);
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385 if (mixbuf == NULL) {
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386 SDL_OutOfMemory ();
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387 return (-1);
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388 }
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389 SDL_memset (mixbuf, spec->silence, spec->size);
0
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390
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391 /* We're ready to rock and roll. :-) */
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392 return (0);
0
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393 }
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394
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395 /************************************************************************/
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396 /* This function (snd2au()) copyrighted: */
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397 /************************************************************************/
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398 /* Copyright 1989 by Rich Gopstein and Harris Corporation */
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399 /* */
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400 /* Permission to use, copy, modify, and distribute this software */
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401 /* and its documentation for any purpose and without fee is */
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402 /* hereby granted, provided that the above copyright notice */
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403 /* appears in all copies and that both that copyright notice and */
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404 /* this permission notice appear in supporting documentation, and */
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405 /* that the name of Rich Gopstein and Harris Corporation not be */
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406 /* used in advertising or publicity pertaining to distribution */
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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 }
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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: */