annotate src/audio/dsp/SDL_dspaudio.c @ 1361:19418e4422cb

New configure-based build system. Still work in progress, but much improved
author Sam Lantinga <slouken@libsdl.org>
date Thu, 16 Feb 2006 10:11:48 +0000
parents c71e05b4dc2e
children d910939febfa
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
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26 /* Allow access to a raw mixing buffer */
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27
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28 #include <stdio.h> /* For perror() */
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29 #include <string.h> /* For strerror() */
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30 #include <errno.h>
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31 #include <unistd.h>
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32 #include <fcntl.h>
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33 #include <signal.h>
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34 #include <sys/time.h>
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35 #include <sys/ioctl.h>
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36 #include <sys/stat.h>
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37
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38 #include "SDL_config.h"
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39
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40 #if SDL_AUDIO_DRIVER_OSS_SOUNDCARD_H
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41 /* This is installed on some systems */
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42 #include <soundcard.h>
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43 #else
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44 /* This is recommended by OSS */
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45 #include <sys/soundcard.h>
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46 #endif
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47
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48 #include "SDL_timer.h"
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49 #include "SDL_audio.h"
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50 #include "../SDL_audiomem.h"
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51 #include "../SDL_audio_c.h"
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52 #include "../SDL_audiodev_c.h"
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53 #include "SDL_dspaudio.h"
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54
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55 /* The tag name used by DSP audio */
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56 #define DSP_DRIVER_NAME "dsp"
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57
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58 /* Open the audio device for playback, and don't block if busy */
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59 #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK)
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60
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61 /* Audio driver functions */
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62 static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec);
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63 static void DSP_WaitAudio(_THIS);
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64 static void DSP_PlayAudio(_THIS);
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65 static Uint8 *DSP_GetAudioBuf(_THIS);
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66 static void DSP_CloseAudio(_THIS);
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67
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68 /* Audio driver bootstrap functions */
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69
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70 static int 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 Audio_DeleteDevice(SDL_AudioDevice *device)
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85 {
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86 SDL_free(device->hidden);
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87 SDL_free(device);
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88 }
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89
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90 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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91 {
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92 SDL_AudioDevice *this;
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93
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94 /* Initialize all variables that we clean on shutdown */
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95 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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96 if ( this ) {
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97 SDL_memset(this, 0, (sizeof *this));
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98 this->hidden = (struct SDL_PrivateAudioData *)
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99 SDL_malloc((sizeof *this->hidden));
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100 }
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101 if ( (this == NULL) || (this->hidden == NULL) ) {
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102 SDL_OutOfMemory();
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103 if ( this ) {
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104 SDL_free(this);
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105 }
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106 return(0);
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107 }
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108 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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109 audio_fd = -1;
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110
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111 /* Set the function pointers */
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112 this->OpenAudio = DSP_OpenAudio;
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113 this->WaitAudio = DSP_WaitAudio;
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114 this->PlayAudio = DSP_PlayAudio;
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115 this->GetAudioBuf = DSP_GetAudioBuf;
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116 this->CloseAudio = DSP_CloseAudio;
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117
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118 this->free = Audio_DeleteDevice;
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119
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120 return this;
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121 }
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122
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123 AudioBootStrap DSP_bootstrap = {
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124 DSP_DRIVER_NAME, "OSS /dev/dsp standard audio",
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125 Audio_Available, Audio_CreateDevice
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126 };
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127
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128 /* This function waits until it is possible to write a full sound buffer */
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129 static void DSP_WaitAudio(_THIS)
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130 {
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131 /* Not needed at all since OSS handles waiting automagically */
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132 }
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133
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134 static void DSP_PlayAudio(_THIS)
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135 {
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136 if (write(audio_fd, mixbuf, mixlen)==-1)
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137 {
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138 perror("Audio write");
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139 this->enabled = 0;
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140 }
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141
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142 #ifdef DEBUG_AUDIO
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143 fprintf(stderr, "Wrote %d bytes of audio data\n", mixlen);
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144 #endif
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145 }
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146
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147 static Uint8 *DSP_GetAudioBuf(_THIS)
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148 {
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149 return(mixbuf);
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150 }
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151
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152 static void DSP_CloseAudio(_THIS)
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153 {
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154 if ( mixbuf != NULL ) {
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155 SDL_FreeAudioMem(mixbuf);
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156 mixbuf = NULL;
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157 }
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diff changeset
158 if ( audio_fd >= 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
159 close(audio_fd);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
160 audio_fd = -1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
161 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
162 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
163
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
164 static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec)
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
165 {
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
166 char audiodev[1024];
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
167 int format;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
168 int value;
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
169 int frag_spec;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
170 Uint16 test_format;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
171
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
172 /* Open the audio device */
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
173 audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
174 if ( audio_fd < 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
175 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
176 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
177 }
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
178 mixbuf = NULL;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
179
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
180 /* 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
181 { long flags;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
182 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
183 flags &= ~O_NONBLOCK;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
184 if ( fcntl(audio_fd, F_SETFL, flags) < 0 ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
185 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
186 DSP_CloseAudio(this);
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
187 return(-1);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
188 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
189 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
190
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
191 /* 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
192 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
193 perror("SNDCTL_DSP_GETFMTS");
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
194 SDL_SetError("Couldn't get audio format list");
1037
c5dedfdb4e42 Date: Tue, 01 Feb 2005 17:53:07 -0800
Sam Lantinga <slouken@libsdl.org>
parents: 968
diff changeset
195 DSP_CloseAudio(this);
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
196 return(-1);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
197 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
198
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
199 /* 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
200 format = 0;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
201 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
202 ! format && test_format; ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
203 #ifdef DEBUG_AUDIO
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
204 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
205 #endif
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
206 switch ( test_format ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
207 case AUDIO_U8:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
208 if ( value & AFMT_U8 ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
209 format = AFMT_U8;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
210 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
211 break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
212 case AUDIO_S16LSB:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
213 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
214 format = AFMT_S16_LE;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
215 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
216 break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
217 case AUDIO_S16MSB:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
218 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
219 format = AFMT_S16_BE;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
220 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
221 break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
222 #if 0
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
223 /*
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
224 * 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
225 * needed here.
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
226 */
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
227 case AUDIO_S8:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
228 if ( value & AFMT_S8 ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
229 format = AFMT_S8;
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 break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
232 case AUDIO_U16LSB:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
233 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
234 format = AFMT_U16_LE;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
235 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
236 break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
237 case AUDIO_U16MSB:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
238 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
239 format = AFMT_U16_BE;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
240 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
241 break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
242 #endif
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
243 default:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
244 format = 0;
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 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
247 if ( ! format ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
248 test_format = SDL_NextAudioFormat();
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
249 }
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 == 0 ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
252 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
253 DSP_CloseAudio(this);
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
254 return(-1);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
255 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
256 spec->format = test_format;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
257
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
258 /* Set the audio format */
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
259 value = format;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
260 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
261 (value != format) ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
262 perror("SNDCTL_DSP_SETFMT");
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
263 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
264 DSP_CloseAudio(this);
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
265 return(-1);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
266 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
267
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
268 /* 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
269 value = spec->channels;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
270 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
271 perror("SNDCTL_DSP_CHANNELS");
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
272 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
273 DSP_CloseAudio(this);
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
274 return(-1);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
275 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
276 spec->channels = value;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
277
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
278 /* Set the DSP frequency */
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
279 value = spec->freq;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
280 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
281 perror("SNDCTL_DSP_SPEED");
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
282 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
283 DSP_CloseAudio(this);
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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284 return(-1);
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285 }
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286 spec->freq = value;
0
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287
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288 /* Calculate the final parameters for this audio specification */
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289 SDL_CalculateAudioSpec(spec);
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290
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291 /* Determine the power of two of the fragment size */
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292 for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec );
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293 if ( (0x01<<frag_spec) != spec->size ) {
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294 SDL_SetError("Fragment size must be a power of two");
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295 DSP_CloseAudio(this);
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296 return(-1);
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297 }
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298 frag_spec |= 0x00020000; /* two fragments, for low latency */
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299
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300 /* Set the audio buffering parameters */
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301 #ifdef DEBUG_AUDIO
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302 fprintf(stderr, "Requesting %d fragments of size %d\n",
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303 (frag_spec >> 16), 1<<(frag_spec&0xFFFF));
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304 #endif
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305 if ( ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0 ) {
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306 perror("SNDCTL_DSP_SETFRAGMENT");
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307 }
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308 #ifdef DEBUG_AUDIO
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309 { audio_buf_info info;
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310 ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info);
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311 fprintf(stderr, "fragments = %d\n", info.fragments);
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312 fprintf(stderr, "fragstotal = %d\n", info.fragstotal);
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313 fprintf(stderr, "fragsize = %d\n", info.fragsize);
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314 fprintf(stderr, "bytes = %d\n", info.bytes);
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315 }
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316 #endif
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317
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318 /* Allocate mixing buffer */
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319 mixlen = spec->size;
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320 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
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321 if ( mixbuf == NULL ) {
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644b39bf7253 *** empty log message ***
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322 DSP_CloseAudio(this);
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323 return(-1);
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324 }
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325 SDL_memset(mixbuf, spec->silence, spec->size);
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326
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327 /* Get the parent process id (we're the parent of the audio thread) */
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328 parent = getpid();
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329
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330 /* We're ready to rock and roll. :-) */
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331 return(0);
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332 }