annotate src/audio/dsp/SDL_dspaudio.c @ 1037:c5dedfdb4e42

Date: Tue, 01 Feb 2005 17:53:07 -0800 From: Bill May Subject: [SDL] Diffs for dsp audio in case of failures. The rewrite recently done for 1.2.8 forgot to handle error cases by closing the audio. Here is a patch that does.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 12 Feb 2005 19:39:08 +0000
parents 4675910b0b7b
children 644b39bf7253
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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
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26 #ifdef SAVE_RCSID
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27 static char rcsid =
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28 "@(#) $Id$";
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29 #endif
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30
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31 /* Allow access to a raw mixing buffer */
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32
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33 #include <stdlib.h>
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34 #include <stdio.h>
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35 #include <string.h>
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36 #include <errno.h>
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37 #include <unistd.h>
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38 #include <fcntl.h>
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39 #include <signal.h>
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40 #include <sys/time.h>
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41 #include <sys/ioctl.h>
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42 #include <sys/stat.h>
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43 #ifdef OSS_USE_SOUNDCARD_H
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44 /* This is installed on some systems */
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45 #include <soundcard.h>
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46 #else
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47 /* This is recommended by OSS */
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48 #include <sys/soundcard.h>
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49 #endif
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50
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51 #include "SDL_audio.h"
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52 #include "SDL_error.h"
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53 #include "SDL_audiomem.h"
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54 #include "SDL_audio_c.h"
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55 #include "SDL_timer.h"
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56 #include "SDL_audiodev_c.h"
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57 #include "SDL_dspaudio.h"
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58
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59 /* The tag name used by DSP audio */
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60 #define DSP_DRIVER_NAME "dsp"
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61
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62 /* Open the audio device for playback, and don't block if busy */
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63 #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK)
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64
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65 /* Audio driver functions */
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66 static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec);
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67 static void DSP_WaitAudio(_THIS);
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68 static void DSP_PlayAudio(_THIS);
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69 static Uint8 *DSP_GetAudioBuf(_THIS);
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70 static void DSP_CloseAudio(_THIS);
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71
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72 /* Audio driver bootstrap functions */
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73
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74 static int Audio_Available(void)
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75 {
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76 int fd;
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77 int available;
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78
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79 available = 0;
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80 fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0);
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81 if ( fd >= 0 ) {
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82 available = 1;
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83 close(fd);
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84 }
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85 return(available);
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86 }
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87
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88 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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89 {
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90 free(device->hidden);
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91 free(device);
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92 }
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93
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94 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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95 {
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96 SDL_AudioDevice *this;
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97
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98 /* Initialize all variables that we clean on shutdown */
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99 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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100 if ( this ) {
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101 memset(this, 0, (sizeof *this));
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102 this->hidden = (struct SDL_PrivateAudioData *)
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103 malloc((sizeof *this->hidden));
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104 }
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105 if ( (this == NULL) || (this->hidden == NULL) ) {
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106 SDL_OutOfMemory();
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107 if ( this ) {
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108 free(this);
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109 }
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110 return(0);
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111 }
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112 memset(this->hidden, 0, (sizeof *this->hidden));
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113 audio_fd = -1;
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114
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115 /* Set the function pointers */
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116 this->OpenAudio = DSP_OpenAudio;
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117 this->WaitAudio = DSP_WaitAudio;
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118 this->PlayAudio = DSP_PlayAudio;
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119 this->GetAudioBuf = DSP_GetAudioBuf;
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120 this->CloseAudio = DSP_CloseAudio;
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121
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122 this->free = Audio_DeleteDevice;
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123
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124 return this;
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125 }
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126
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127 AudioBootStrap DSP_bootstrap = {
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128 DSP_DRIVER_NAME, "OSS /dev/dsp standard audio",
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129 Audio_Available, Audio_CreateDevice
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130 };
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131
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132 /* This function waits until it is possible to write a full sound buffer */
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133 static void DSP_WaitAudio(_THIS)
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134 {
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135 /* Not needed at all since OSS handles waiting automagically */
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136 }
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137
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138 static void 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 {
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142 perror("Audio write");
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143 this->enabled = 0;
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144 }
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145
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146 #ifdef DEBUG_AUDIO
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147 fprintf(stderr, "Wrote %d bytes of audio data\n", mixlen);
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148 #endif
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149 }
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150
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151 static Uint8 *DSP_GetAudioBuf(_THIS)
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152 {
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153 return(mixbuf);
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154 }
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155
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156 static void 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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parents:
diff changeset
166 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
167
968
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parents: 960
diff changeset
168 static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec)
0
74212992fb08 Initial revision
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parents:
diff changeset
169 {
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
170 char audiodev[1024];
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
171 int format;
0
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parents:
diff changeset
172 int value;
968
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parents: 960
diff changeset
173 int frag_spec;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
174 Uint16 test_format;
0
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parents:
diff changeset
175
968
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parents: 960
diff changeset
176 /* Open the audio device */
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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parents: 960
diff changeset
177 audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0);
0
74212992fb08 Initial revision
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parents:
diff changeset
178 if ( audio_fd < 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
179 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
74212992fb08 Initial revision
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parents:
diff changeset
180 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
181 }
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
182 mixbuf = NULL;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
183
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
184 /* Make the file descriptor use blocking writes with fcntl() */
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
185 { long flags;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
186 flags = fcntl(audio_fd, F_GETFL);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
187 flags &= ~O_NONBLOCK;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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parents: 960
diff changeset
188 if ( fcntl(audio_fd, F_SETFL, flags) < 0 ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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parents: 960
diff changeset
189 SDL_SetError("Couldn't set audio blocking mode");
1037
c5dedfdb4e42 Date: Tue, 01 Feb 2005 17:53:07 -0800
Sam Lantinga <slouken@libsdl.org>
parents: 968
diff changeset
190 DSP_CloseAudio(this);
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
191 return(-1);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
192 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
193 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
194
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
195 /* Get a list of supported hardware formats */
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
196 if ( ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0 ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
197 perror("SNDCTL_DSP_GETFMTS");
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
198 SDL_SetError("Couldn't get audio format list");
1037
c5dedfdb4e42 Date: Tue, 01 Feb 2005 17:53:07 -0800
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parents: 968
diff changeset
199 DSP_CloseAudio(this);
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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parents: 960
diff changeset
200 return(-1);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
201 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
202
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
203 /* Try for a closest match on audio format */
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
204 format = 0;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
205 for ( test_format = SDL_FirstAudioFormat(spec->format);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
206 ! format && test_format; ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
207 #ifdef DEBUG_AUDIO
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
208 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
209 #endif
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
210 switch ( test_format ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
211 case AUDIO_U8:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
212 if ( value & AFMT_U8 ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
213 format = AFMT_U8;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
214 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
215 break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
216 case AUDIO_S16LSB:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
217 if ( value & AFMT_S16_LE ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
218 format = AFMT_S16_LE;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
219 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
220 break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
221 case AUDIO_S16MSB:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
222 if ( value & AFMT_S16_BE ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
223 format = AFMT_S16_BE;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
224 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
225 break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
226 #if 0
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
227 /*
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
228 * These formats are not used by any real life systems so they are not
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
229 * needed here.
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
230 */
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
231 case AUDIO_S8:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
232 if ( value & AFMT_S8 ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
233 format = AFMT_S8;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
234 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
235 break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
236 case AUDIO_U16LSB:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
237 if ( value & AFMT_U16_LE ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
238 format = AFMT_U16_LE;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
239 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
240 break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
241 case AUDIO_U16MSB:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
242 if ( value & AFMT_U16_BE ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
243 format = AFMT_U16_BE;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
244 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
245 break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
246 #endif
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
247 default:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
248 format = 0;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
249 break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
250 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
251 if ( ! format ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
252 test_format = SDL_NextAudioFormat();
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
253 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
254 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
255 if ( format == 0 ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
256 SDL_SetError("Couldn't find any hardware audio formats");
1037
c5dedfdb4e42 Date: Tue, 01 Feb 2005 17:53:07 -0800
Sam Lantinga <slouken@libsdl.org>
parents: 968
diff changeset
257 DSP_CloseAudio(this);
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
258 return(-1);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
259 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
260 spec->format = test_format;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
261
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
262 /* Set the audio format */
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
263 value = format;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
264 if ( (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) ||
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
265 (value != format) ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
266 perror("SNDCTL_DSP_SETFMT");
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
267 SDL_SetError("Couldn't set audio format");
1037
c5dedfdb4e42 Date: Tue, 01 Feb 2005 17:53:07 -0800
Sam Lantinga <slouken@libsdl.org>
parents: 968
diff changeset
268 DSP_CloseAudio(this);
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
269 return(-1);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
270 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
271
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
272 /* Set the number of channels of output */
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
273 value = spec->channels;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
274 if ( ioctl(audio_fd, SNDCTL_DSP_CHANNELS, &value) < 0 ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
275 perror("SNDCTL_DSP_CHANNELS");
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
276 SDL_SetError("Cannot set the number of channels");
1037
c5dedfdb4e42 Date: Tue, 01 Feb 2005 17:53:07 -0800
Sam Lantinga <slouken@libsdl.org>
parents: 968
diff changeset
277 DSP_CloseAudio(this);
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
278 return(-1);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
279 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
280 spec->channels = value;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
281
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
282 /* Set the DSP frequency */
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
283 value = spec->freq;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
284 if ( ioctl(audio_fd, SNDCTL_DSP_SPEED, &value) < 0 ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
285 perror("SNDCTL_DSP_SPEED");
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
286 SDL_SetError("Couldn't set audio frequency");
1037
c5dedfdb4e42 Date: Tue, 01 Feb 2005 17:53:07 -0800
Sam Lantinga <slouken@libsdl.org>
parents: 968
diff changeset
287 DSP_CloseAudio(this);
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
288 return(-1);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
289 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
290 spec->freq = value;
0
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291
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292 /* Calculate the final parameters for this audio specification */
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293 SDL_CalculateAudioSpec(spec);
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294
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295 /* Determine the power of two of the fragment size */
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296 for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec );
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297 if ( (0x01<<frag_spec) != spec->size ) {
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298 SDL_SetError("Fragment size must be a power of two");
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299 DSP_CloseAudio(this);
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300 return(-1);
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301 }
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302 frag_spec |= 0x00020000; /* two fragments, for low latency */
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303
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304 /* Set the audio buffering parameters */
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305 #ifdef DEBUG_AUDIO
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306 fprintf(stderr, "Requesting %d fragments of size %d\n",
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307 (frag_spec >> 16), 1<<(frag_spec&0xFFFF));
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308 #endif
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309 if ( ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0 ) {
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310 perror("SNDCTL_DSP_SETFRAGMENT");
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311 fprintf(stderr, "Warning: Couldn't set audio fragment size\n");
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312 }
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313 #ifdef DEBUG_AUDIO
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314 { audio_buf_info info;
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315 ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info);
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316 fprintf(stderr, "fragments = %d\n", info.fragments);
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317 fprintf(stderr, "fragstotal = %d\n", info.fragstotal);
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318 fprintf(stderr, "fragsize = %d\n", info.fragsize);
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319 fprintf(stderr, "bytes = %d\n", info.bytes);
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320 }
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321 #endif
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322
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323 /* Allocate mixing buffer */
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324 mixlen = spec->size;
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325 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
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326 if ( mixbuf == NULL ) {
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327 DSP_CloseAudio(this);
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328 return(-1);
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329 }
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330 memset(mixbuf, spec->silence, spec->size);
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331
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332 /* Get the parent process id (we're the parent of the audio thread) */
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333 parent = getpid();
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334
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335 /* We're ready to rock and roll. :-) */
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336 return(0);
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337 }