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annotate src/audio/dsp/SDL_dspaudio.c @ 1664:cd3db072ba8a SDL-1.3

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more indent cleanup
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 18:16:36 +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 Modified in Oct 2004 by Hannu Savolainen
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23 hannu@opensound.com
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24 */
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25 #include "SDL_config.h"
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26
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27 /* Allow access to a raw mixing buffer */
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28
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29 #include <stdio.h> /* For perror() */
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30 #include <string.h> /* For strerror() */
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31 #include <errno.h>
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32 #include <unistd.h>
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33 #include <fcntl.h>
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34 #include <signal.h>
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35 #include <sys/time.h>
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36 #include <sys/ioctl.h>
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37 #include <sys/stat.h>
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38
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39 #if SDL_AUDIO_DRIVER_OSS_SOUNDCARD_H
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40 /* This is installed on some systems */
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41 #include <soundcard.h>
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42 #else
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43 /* This is recommended by OSS */
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44 #include <sys/soundcard.h>
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45 #endif
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46
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47 #include "SDL_timer.h"
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48 #include "SDL_audio.h"
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49 #include "../SDL_audiomem.h"
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50 #include "../SDL_audio_c.h"
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51 #include "../SDL_audiodev_c.h"
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52 #include "SDL_dspaudio.h"
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53
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54 /* The tag name used by DSP audio */
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55 #define DSP_DRIVER_NAME "dsp"
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56
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57 /* Open the audio device for playback, and don't block if busy */
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58 #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK)
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59
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60 /* Audio driver functions */
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61 static int DSP_OpenAudio (_THIS, SDL_AudioSpec * spec);
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62 static void DSP_WaitAudio (_THIS);
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63 static void DSP_PlayAudio (_THIS);
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64 static Uint8 *DSP_GetAudioBuf (_THIS);
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65 static void DSP_CloseAudio (_THIS);
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66
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67 /* Audio driver bootstrap functions */
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68
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69 static int
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70 Audio_Available (void)
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71 {
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72 int fd;
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73 int available;
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74
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75 available = 0;
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76 fd = SDL_OpenAudioPath (NULL, 0, OPEN_FLAGS, 0);
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77 if (fd >= 0) {
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78 available = 1;
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79 close (fd);
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80 }
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81 return (available);
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82 }
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83
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84 static void
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85 Audio_DeleteDevice (SDL_AudioDevice * device)
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86 {
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87 SDL_free (device->hidden);
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88 SDL_free (device);
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89 }
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90
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91 static SDL_AudioDevice *
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92 Audio_CreateDevice (int devindex)
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93 {
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94 SDL_AudioDevice *this;
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95
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96 /* Initialize all variables that we clean on shutdown */
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97 this = (SDL_AudioDevice *) SDL_malloc (sizeof (SDL_AudioDevice));
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98 if (this) {
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99 SDL_memset (this, 0, (sizeof *this));
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100 this->hidden = (struct SDL_PrivateAudioData *)
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101 SDL_malloc ((sizeof *this->hidden));
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102 }
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103 if ((this == NULL) || (this->hidden == NULL)) {
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104 SDL_OutOfMemory ();
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105 if (this) {
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106 SDL_free (this);
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107 }
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108 return (0);
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109 }
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110 SDL_memset (this->hidden, 0, (sizeof *this->hidden));
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111 audio_fd = -1;
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112
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113 /* Set the function pointers */
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114 this->OpenAudio = DSP_OpenAudio;
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115 this->WaitAudio = DSP_WaitAudio;
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116 this->PlayAudio = DSP_PlayAudio;
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117 this->GetAudioBuf = DSP_GetAudioBuf;
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118 this->CloseAudio = DSP_CloseAudio;
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119
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120 this->free = Audio_DeleteDevice;
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121
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122 return this;
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123 }
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124
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125 AudioBootStrap DSP_bootstrap = {
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126 DSP_DRIVER_NAME, "OSS /dev/dsp standard audio",
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127 Audio_Available, Audio_CreateDevice
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128 };
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129
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130 /* This function waits until it is possible to write a full sound buffer */
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131 static void
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132 DSP_WaitAudio (_THIS)
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133 {
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134 /* Not needed at all since OSS handles waiting automagically */
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135 }
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136
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137 static void
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138 DSP_PlayAudio (_THIS)
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139 {
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140 if (write (audio_fd, mixbuf, mixlen) == -1) {
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141 perror ("Audio write");
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142 this->enabled = 0;
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143 }
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144 #ifdef DEBUG_AUDIO
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145 fprintf (stderr, "Wrote %d bytes of audio data\n", mixlen);
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146 #endif
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147 }
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148
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149 static Uint8 *
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150 DSP_GetAudioBuf (_THIS)
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151 {
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152 return (mixbuf);
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153 }
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154
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155 static void
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156 DSP_CloseAudio (_THIS)
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157 {
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158 if (mixbuf != NULL) {
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159 SDL_FreeAudioMem (mixbuf);
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160 mixbuf = NULL;
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161 }
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162 if (audio_fd >= 0) {
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163 close (audio_fd);
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164 audio_fd = -1;
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165 }
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166 }
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167
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168 static int
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169 DSP_OpenAudio (_THIS, SDL_AudioSpec * spec)
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170 {
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171 char audiodev[1024];
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172 int format;
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173 int value;
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174 int frag_spec;
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175 Uint16 test_format;
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176
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177 /* Open the audio device */
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178 audio_fd = SDL_OpenAudioPath (audiodev, sizeof (audiodev), OPEN_FLAGS, 0);
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179 if (audio_fd < 0) {
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180 SDL_SetError ("Couldn't open %s: %s", audiodev, strerror (errno));
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181 return (-1);
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182 }
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183 mixbuf = NULL;
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184
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185 /* Make the file descriptor use blocking writes with fcntl() */
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186 {
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187 long flags;
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188 flags = fcntl (audio_fd, F_GETFL);
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189 flags &= ~O_NONBLOCK;
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190 if (fcntl (audio_fd, F_SETFL, flags) < 0) {
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191 SDL_SetError ("Couldn't set audio blocking mode");
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192 DSP_CloseAudio (this);
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193 return (-1);
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194 }
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195 }
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196
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197 /* Get a list of supported hardware formats */
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198 if (ioctl (audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0) {
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199 perror ("SNDCTL_DSP_GETFMTS");
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200 SDL_SetError ("Couldn't get audio format list");
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201 DSP_CloseAudio (this);
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202 return (-1);
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203 }
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204
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205 /* Try for a closest match on audio format */
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206 format = 0;
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207 for (test_format = SDL_FirstAudioFormat (spec->format);
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208 !format && test_format;) {
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209 #ifdef DEBUG_AUDIO
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210 fprintf (stderr, "Trying format 0x%4.4x\n", test_format);
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211 #endif
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212 switch (test_format) {
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213 case AUDIO_U8:
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214 if (value & AFMT_U8) {
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215 format = AFMT_U8;
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216 }
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217 break;
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218 case AUDIO_S16LSB:
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219 if (value & AFMT_S16_LE) {
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220 format = AFMT_S16_LE;
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221 }
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222 break;
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223 case AUDIO_S16MSB:
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224 if (value & AFMT_S16_BE) {
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225 format = AFMT_S16_BE;
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226 }
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diff changeset
227 break;
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228 #if 0
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229 /*
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230 * These formats are not used by any real life systems so they are not
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231 * needed here.
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232 */
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233 case AUDIO_S8:
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234 if (value & AFMT_S8) {
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235 format = AFMT_S8;
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236 }
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237 break;
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diff changeset
238 case AUDIO_U16LSB:
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239 if (value & AFMT_U16_LE) {
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240 format = AFMT_U16_LE;
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241 }
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242 break;
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243 case AUDIO_U16MSB:
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244 if (value & AFMT_U16_BE) {
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245 format = AFMT_U16_BE;
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246 }
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diff changeset
247 break;
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248 #endif
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249 default:
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diff changeset
250 format = 0;
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251 break;
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diff changeset
252 }
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diff changeset
253 if (!format) {
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254 test_format = SDL_NextAudioFormat ();
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255 }
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256 }
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257 if (format == 0) {
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258 SDL_SetError ("Couldn't find any hardware audio formats");
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259 DSP_CloseAudio (this);
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260 return (-1);
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261 }
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262 spec->format = test_format;
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263
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264 /* Set the audio format */
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265 value = format;
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266 if ((ioctl (audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) ||
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267 (value != format)) {
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268 perror ("SNDCTL_DSP_SETFMT");
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269 SDL_SetError ("Couldn't set audio format");
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270 DSP_CloseAudio (this);
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271 return (-1);
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272 }
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273
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274 /* Set the number of channels of output */
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275 value = spec->channels;
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276 if (ioctl (audio_fd, SNDCTL_DSP_CHANNELS, &value) < 0) {
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277 perror ("SNDCTL_DSP_CHANNELS");
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278 SDL_SetError ("Cannot set the number of channels");
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279 DSP_CloseAudio (this);
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280 return (-1);
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281 }
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282 spec->channels = value;
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283
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284 /* Set the DSP frequency */
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285 value = spec->freq;
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286 if (ioctl (audio_fd, SNDCTL_DSP_SPEED, &value) < 0) {
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287 perror ("SNDCTL_DSP_SPEED");
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288 SDL_SetError ("Couldn't set audio frequency");
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289 DSP_CloseAudio (this);
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290 return (-1);
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291 }
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292 spec->freq = value;
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293
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294 /* Calculate the final parameters for this audio specification */
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295 SDL_CalculateAudioSpec (spec);
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296
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297 /* Determine the power of two of the fragment size */
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298 for (frag_spec = 0; (0x01U << frag_spec) < spec->size; ++frag_spec);
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299 if ((0x01U << frag_spec) != spec->size) {
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300 SDL_SetError ("Fragment size must be a power of two");
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301 DSP_CloseAudio (this);
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302 return (-1);
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303 }
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304 frag_spec |= 0x00020000; /* two fragments, for low latency */
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305
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306 /* Set the audio buffering parameters */
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307 #ifdef DEBUG_AUDIO
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308 fprintf (stderr, "Requesting %d fragments of size %d\n",
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309 (frag_spec >> 16), 1 << (frag_spec & 0xFFFF));
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310 #endif
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311 if (ioctl (audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0) {
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312 perror ("SNDCTL_DSP_SETFRAGMENT");
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313 }
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314 #ifdef DEBUG_AUDIO
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315 {
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316 audio_buf_info info;
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317 ioctl (audio_fd, SNDCTL_DSP_GETOSPACE, &info);
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318 fprintf (stderr, "fragments = %d\n", info.fragments);
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319 fprintf (stderr, "fragstotal = %d\n", info.fragstotal);
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320 fprintf (stderr, "fragsize = %d\n", info.fragsize);
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321 fprintf (stderr, "bytes = %d\n", info.bytes);
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322 }
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diff changeset
323 #endif
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324
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325 /* Allocate mixing buffer */
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diff changeset
326 mixlen = spec->size;
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327 mixbuf = (Uint8 *) SDL_AllocAudioMem (mixlen);
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diff changeset
328 if (mixbuf == NULL) {
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329 DSP_CloseAudio (this);
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330 return (-1);
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331 }
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diff changeset
332 SDL_memset (mixbuf, spec->silence, spec->size);
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diff changeset
333
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334 /* Get the parent process id (we're the parent of the audio thread) */
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diff changeset
335 parent = getpid ();
0
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diff changeset
336
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337 /* We're ready to rock and roll. :-) */
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diff changeset
338 return (0);
0
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339 }
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diff changeset
340
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341 /* vi: set ts=4 sw=4 expandtab: */