annotate src/audio/dsp/SDL_dspaudio.c @ 3895:aeb55f698ee3 SDL-1.2

Block fruity channel values in dspaudio, or the fragment size won't be a power of 2.
author Ryan C. Gordon <icculus@icculus.org>
date Sun, 12 Nov 2006 21:23:57 +0000
parents 97d0966f4bf7
children a1b03ba2fcd0
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 Audio_Available(void)
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70 {
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71 int fd;
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72 int available;
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73
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74 available = 0;
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75 fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0);
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76 if ( fd >= 0 ) {
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77 available = 1;
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78 close(fd);
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79 }
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80 return(available);
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81 }
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82
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83 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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84 {
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85 SDL_free(device->hidden);
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86 SDL_free(device);
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87 }
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88
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89 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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90 {
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91 SDL_AudioDevice *this;
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92
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93 /* Initialize all variables that we clean on shutdown */
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94 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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95 if ( this ) {
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96 SDL_memset(this, 0, (sizeof *this));
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97 this->hidden = (struct SDL_PrivateAudioData *)
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98 SDL_malloc((sizeof *this->hidden));
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99 }
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100 if ( (this == NULL) || (this->hidden == NULL) ) {
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101 SDL_OutOfMemory();
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102 if ( this ) {
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103 SDL_free(this);
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104 }
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105 return(0);
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106 }
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107 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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108 audio_fd = -1;
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109
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110 /* Set the function pointers */
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111 this->OpenAudio = DSP_OpenAudio;
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112 this->WaitAudio = DSP_WaitAudio;
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113 this->PlayAudio = DSP_PlayAudio;
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114 this->GetAudioBuf = DSP_GetAudioBuf;
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115 this->CloseAudio = DSP_CloseAudio;
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116
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117 this->free = Audio_DeleteDevice;
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118
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119 return this;
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120 }
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121
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122 AudioBootStrap DSP_bootstrap = {
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123 DSP_DRIVER_NAME, "OSS /dev/dsp standard audio",
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124 Audio_Available, Audio_CreateDevice
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125 };
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126
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127 /* This function waits until it is possible to write a full sound buffer */
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128 static void DSP_WaitAudio(_THIS)
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129 {
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130 /* Not needed at all since OSS handles waiting automagically */
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131 }
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132
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133 static void DSP_PlayAudio(_THIS)
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134 {
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135 if (write(audio_fd, mixbuf, mixlen)==-1)
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136 {
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137 perror("Audio write");
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138 this->enabled = 0;
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139 }
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140
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141 #ifdef DEBUG_AUDIO
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142 fprintf(stderr, "Wrote %d bytes of audio data\n", mixlen);
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143 #endif
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144 }
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145
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146 static Uint8 *DSP_GetAudioBuf(_THIS)
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147 {
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148 return(mixbuf);
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149 }
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150
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151 static void DSP_CloseAudio(_THIS)
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152 {
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153 if ( mixbuf != NULL ) {
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154 SDL_FreeAudioMem(mixbuf);
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155 mixbuf = NULL;
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156 }
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157 if ( audio_fd >= 0 ) {
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parents:
diff changeset
158 close(audio_fd);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
159 audio_fd = -1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
160 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
161 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
162
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
163 static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec)
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
164 {
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
165 char audiodev[1024];
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
166 int format;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
167 int value;
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
168 int frag_spec;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
169 Uint16 test_format;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
170
3895
aeb55f698ee3 Block fruity channel values in dspaudio, or the fragment size won't be a
Ryan C. Gordon <icculus@icculus.org>
parents: 1612
diff changeset
171 /* Make sure fragment size stays a power of 2, or OSS fails. */
aeb55f698ee3 Block fruity channel values in dspaudio, or the fragment size won't be a
Ryan C. Gordon <icculus@icculus.org>
parents: 1612
diff changeset
172 /* I don't know which of these are actually legal values, though... */
aeb55f698ee3 Block fruity channel values in dspaudio, or the fragment size won't be a
Ryan C. Gordon <icculus@icculus.org>
parents: 1612
diff changeset
173 if (spec->channels > 8)
aeb55f698ee3 Block fruity channel values in dspaudio, or the fragment size won't be a
Ryan C. Gordon <icculus@icculus.org>
parents: 1612
diff changeset
174 spec->channels = 8;
aeb55f698ee3 Block fruity channel values in dspaudio, or the fragment size won't be a
Ryan C. Gordon <icculus@icculus.org>
parents: 1612
diff changeset
175 else if (spec->channels > 4)
aeb55f698ee3 Block fruity channel values in dspaudio, or the fragment size won't be a
Ryan C. Gordon <icculus@icculus.org>
parents: 1612
diff changeset
176 spec->channels = 4;
aeb55f698ee3 Block fruity channel values in dspaudio, or the fragment size won't be a
Ryan C. Gordon <icculus@icculus.org>
parents: 1612
diff changeset
177 else if (spec->channels > 2)
aeb55f698ee3 Block fruity channel values in dspaudio, or the fragment size won't be a
Ryan C. Gordon <icculus@icculus.org>
parents: 1612
diff changeset
178 spec->channels = 2;
aeb55f698ee3 Block fruity channel values in dspaudio, or the fragment size won't be a
Ryan C. Gordon <icculus@icculus.org>
parents: 1612
diff changeset
179
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
180 /* Open the audio device */
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
181 audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
182 if ( audio_fd < 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
183 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
184 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
185 }
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
186 mixbuf = NULL;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
187
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
188 /* 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
189 { long flags;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
190 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
191 flags &= ~O_NONBLOCK;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
192 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
193 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
194 DSP_CloseAudio(this);
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
195 return(-1);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
196 }
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 /* 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
200 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
201 perror("SNDCTL_DSP_GETFMTS");
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
202 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
203 DSP_CloseAudio(this);
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
204 return(-1);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
205 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
206
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
207 /* 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
208 format = 0;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
209 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
210 ! format && test_format; ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
211 #ifdef DEBUG_AUDIO
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
212 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
213 #endif
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
214 switch ( test_format ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
215 case AUDIO_U8:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
216 if ( value & AFMT_U8 ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
217 format = AFMT_U8;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
218 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
219 break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
220 case AUDIO_S16LSB:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
221 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
222 format = AFMT_S16_LE;
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 break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
225 case AUDIO_S16MSB:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
226 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
227 format = AFMT_S16_BE;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
228 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
229 break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
230 #if 0
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
231 /*
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
232 * 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
233 * needed here.
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 case AUDIO_S8:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
236 if ( value & AFMT_S8 ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
237 format = AFMT_S8;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
238 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
239 break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
240 case AUDIO_U16LSB:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
241 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
242 format = AFMT_U16_LE;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
243 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
244 break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
245 case AUDIO_U16MSB:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
246 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
247 format = AFMT_U16_BE;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
248 }
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 #endif
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
251 default:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
252 format = 0;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
253 break;
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 ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
256 test_format = SDL_NextAudioFormat();
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 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
259 if ( format == 0 ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
260 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
261 DSP_CloseAudio(this);
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
262 return(-1);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
263 }
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
264 spec->format = test_format;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
265
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
266 /* Set the audio format */
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
267 value = format;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
268 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
269 (value != format) ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
270 perror("SNDCTL_DSP_SETFMT");
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
271 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
272 DSP_CloseAudio(this);
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
273 return(-1);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
274 }
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 /* 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
277 value = spec->channels;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
278 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
279 perror("SNDCTL_DSP_CHANNELS");
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
280 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
281 DSP_CloseAudio(this);
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
282 return(-1);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
283 }
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284 spec->channels = value;
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285
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286 /* Set the DSP frequency */
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287 value = spec->freq;
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288 if ( ioctl(audio_fd, SNDCTL_DSP_SPEED, &value) < 0 ) {
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289 perror("SNDCTL_DSP_SPEED");
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290 SDL_SetError("Couldn't set audio frequency");
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291 DSP_CloseAudio(this);
968
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292 return(-1);
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293 }
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294 spec->freq = value;
0
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295
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296 /* Calculate the final parameters for this audio specification */
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297 SDL_CalculateAudioSpec(spec);
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298
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299 /* Determine the power of two of the fragment size */
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97d0966f4bf7 Fixed some ultra-pedantic gcc warnings
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300 for ( frag_spec = 0; (0x01U<<frag_spec) < spec->size; ++frag_spec );
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301 if ( (0x01U<<frag_spec) != spec->size ) {
0
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302 SDL_SetError("Fragment size must be a power of two");
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303 DSP_CloseAudio(this);
0
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304 return(-1);
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305 }
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306 frag_spec |= 0x00020000; /* two fragments, for low latency */
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307
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308 /* Set the audio buffering parameters */
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309 #ifdef DEBUG_AUDIO
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310 fprintf(stderr, "Requesting %d fragments of size %d\n",
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311 (frag_spec >> 16), 1<<(frag_spec&0xFFFF));
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312 #endif
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313 if ( ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0 ) {
968
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314 perror("SNDCTL_DSP_SETFRAGMENT");
0
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315 }
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316 #ifdef DEBUG_AUDIO
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317 { audio_buf_info info;
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318 ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info);
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319 fprintf(stderr, "fragments = %d\n", info.fragments);
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320 fprintf(stderr, "fragstotal = %d\n", info.fragstotal);
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321 fprintf(stderr, "fragsize = %d\n", info.fragsize);
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322 fprintf(stderr, "bytes = %d\n", info.bytes);
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323 }
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324 #endif
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325
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326 /* Allocate mixing buffer */
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327 mixlen = spec->size;
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328 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
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329 if ( mixbuf == NULL ) {
1281
644b39bf7253 *** empty log message ***
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330 DSP_CloseAudio(this);
0
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331 return(-1);
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332 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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333 SDL_memset(mixbuf, spec->silence, spec->size);
0
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334
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335 /* Get the parent process id (we're the parent of the audio thread) */
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336 parent = getpid();
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337
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338 /* We're ready to rock and roll. :-) */
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339 return(0);
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340 }