Mercurial > sdl-ios-xcode

annotate src/audio/bsd/SDL_bsdaudio.c @ 4001:6831b8723a85 SDL-1.2

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Don't initialize the audio buffer passed to the application's audio callback, since they are expected to entirely fill it with data or silence. For legacy apps that might expect the buffer to already have silence and thus may not fill the buffer in the callback, there's an environment variable to expose the old behaviour. Fixes Bugzilla #416.
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 05 Jul 2007 02:24:36 +0000
parents 95451df282c3
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
rev   line source
1567
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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 #include "SDL_config.h"
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23
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24 /*
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25 * Driver for native OpenBSD/NetBSD audio(4).
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26 * vedge@vedge.com.ar.
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27 */
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28
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29 #include <errno.h>
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30 #include <unistd.h>
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31 #include <fcntl.h>
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32 #include <sys/time.h>
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33 #include <sys/ioctl.h>
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34 #include <sys/stat.h>
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35 #include <sys/types.h>
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36 #include <sys/audioio.h>
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37
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38 #include "SDL_timer.h"
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39 #include "SDL_audio.h"
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40 #include "../SDL_audiomem.h"
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41 #include "../SDL_audio_c.h"
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42 #include "../SDL_audiodev_c.h"
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43 #include "SDL_bsdaudio.h"
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44
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45 /* The tag name used by NetBSD/OpenBSD audio */
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46 #ifdef __NetBSD__
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47 #define BSD_AUDIO_DRIVER_NAME "netbsd"
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48 #define BSD_AUDIO_DRIVER_DESC "Native NetBSD audio"
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49 #else
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50 #define BSD_AUDIO_DRIVER_NAME "openbsd"
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51 #define BSD_AUDIO_DRIVER_DESC "Native OpenBSD audio"
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52 #endif
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53
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54 /* Open the audio device for playback, and don't block if busy */
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55 /* #define USE_BLOCKING_WRITES */
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56
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57 /* Use timer for synchronization */
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58 /* #define USE_TIMER_SYNC */
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59
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60 /* #define DEBUG_AUDIO */
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61 /* #define DEBUG_AUDIO_STREAM */
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62
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63 #ifdef USE_BLOCKING_WRITES
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64 #define OPEN_FLAGS O_WRONLY
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65 #else
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66 #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK)
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67 #endif
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68
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69 /* Audio driver functions */
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70 static void OBSD_WaitAudio(_THIS);
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71 static int OBSD_OpenAudio(_THIS, SDL_AudioSpec *spec);
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72 static void OBSD_PlayAudio(_THIS);
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73 static Uint8 *OBSD_GetAudioBuf(_THIS);
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74 static void OBSD_CloseAudio(_THIS);
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75
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76 #ifdef DEBUG_AUDIO
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77 static void OBSD_Status(_THIS);
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78 #endif
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79
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80 /* Audio driver bootstrap functions */
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81
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82 static int
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83 Audio_Available(void)
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84 {
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85 int fd;
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86 int available;
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87
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88 available = 0;
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89 fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0);
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90 if(fd >= 0) {
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91 available = 1;
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92 close(fd);
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93 }
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94 return(available);
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95 }
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96
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97 static void
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98 Audio_DeleteDevice(SDL_AudioDevice *device)
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99 {
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100 SDL_free(device->hidden);
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101 SDL_free(device);
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102 }
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103
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104 static SDL_AudioDevice
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105 *Audio_CreateDevice(int devindex)
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106 {
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107 SDL_AudioDevice *this;
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108
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109 /* Initialize all variables that we clean on shutdown */
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110 this = (SDL_AudioDevice*)SDL_malloc(sizeof(SDL_AudioDevice));
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111 if(this) {
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112 SDL_memset(this, 0, (sizeof *this));
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113 this->hidden =
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114 (struct SDL_PrivateAudioData*)SDL_malloc((sizeof *this->hidden));
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115 }
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116 if((this == NULL) || (this->hidden == NULL)) {
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117 SDL_OutOfMemory();
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118 if(this) SDL_free(this);
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119 return(0);
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120 }
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121 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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122 audio_fd = -1;
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123
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124 /* Set the function pointers */
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125 this->OpenAudio = OBSD_OpenAudio;
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126 this->WaitAudio = OBSD_WaitAudio;
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127 this->PlayAudio = OBSD_PlayAudio;
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128 this->GetAudioBuf = OBSD_GetAudioBuf;
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129 this->CloseAudio = OBSD_CloseAudio;
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130
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131 this->free = Audio_DeleteDevice;
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132
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133 return this;
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134 }
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135
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136 AudioBootStrap BSD_AUDIO_bootstrap = {
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137 BSD_AUDIO_DRIVER_NAME, BSD_AUDIO_DRIVER_DESC,
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138 Audio_Available, Audio_CreateDevice
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139 };
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140
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
141 /* This function waits until it is possible to write a full sound buffer */
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
142 static void
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
143 OBSD_WaitAudio(_THIS)
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
144 {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
145 #ifndef USE_BLOCKING_WRITES /* Not necessary when using blocking writes */
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
146 /* See if we need to use timed audio synchronization */
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
147 if ( frame_ticks ) {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
148 /* Use timer for general audio synchronization */
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
149 Sint32 ticks;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
150
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
151 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
152 if ( ticks > 0 ) {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
153 SDL_Delay(ticks);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
154 }
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
155 } else {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
156 /* Use select() for audio synchronization */
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
157 fd_set fdset;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
158 struct timeval timeout;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
159
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
160 FD_ZERO(&fdset);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
161 FD_SET(audio_fd, &fdset);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
162 timeout.tv_sec = 10;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
163 timeout.tv_usec = 0;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
164 #ifdef DEBUG_AUDIO
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
165 fprintf(stderr, "Waiting for audio to get ready\n");
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
166 #endif
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
167 if ( select(audio_fd+1, NULL, &fdset, NULL, &timeout) <= 0 ) {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
168 const char *message =
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
169 "Audio timeout - buggy audio driver? (disabled)";
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
170 /* In general we should never print to the screen,
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
171 but in this case we have no other way of letting
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
172 the user know what happened.
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
173 */
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
174 fprintf(stderr, "SDL: %s\n", message);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
175 this->enabled = 0;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
176 /* Don't try to close - may hang */
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
177 audio_fd = -1;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
178 #ifdef DEBUG_AUDIO
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
179 fprintf(stderr, "Done disabling audio\n");
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
180 #endif
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
181 }
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
182 #ifdef DEBUG_AUDIO
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
183 fprintf(stderr, "Ready!\n");
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
184 #endif
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
185 }
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
186 #endif /* !USE_BLOCKING_WRITES */
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
187 }
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
188
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
189 static void
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
190 OBSD_PlayAudio(_THIS)
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
191 {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
192 int written, p=0;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
193
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
194 /* Write the audio data, checking for EAGAIN on broken audio drivers */
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
195 do {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
196 written = write(audio_fd, &mixbuf[p], mixlen-p);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
197 if (written>0)
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
198 p += written;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
199 if (written == -1 && errno != 0 && errno != EAGAIN && errno != EINTR)
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
200 {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
201 /* Non recoverable error has occurred. It should be reported!!! */
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
202 perror("audio");
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
203 break;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
204 }
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
205
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
206 if ( p < written || ((written < 0) && ((errno == 0) || (errno == EAGAIN))) ) {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
207 SDL_Delay(1); /* Let a little CPU time go by */
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
208 }
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
209 } while ( p < written );
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
210
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
211 /* If timer synchronization is enabled, set the next write frame */
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
212 if ( frame_ticks ) {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
213 next_frame += frame_ticks;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
214 }
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
215
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
216 /* If we couldn't write, assume fatal error for now */
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
217 if ( written < 0 ) {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
218 this->enabled = 0;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
219 }
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
220 #ifdef DEBUG_AUDIO
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
221 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
222 #endif
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
223 }
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
224
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
225 static Uint8
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
226 *OBSD_GetAudioBuf(_THIS)
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
227 {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
228 return(mixbuf);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
229 }
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
230
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
231 static void
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
232 OBSD_CloseAudio(_THIS)
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
233 {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
234 if(mixbuf != NULL) {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
235 SDL_FreeAudioMem(mixbuf);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
236 mixbuf = NULL;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
237 }
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
238 if(audio_fd >= 0) {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
239 close(audio_fd);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
240 audio_fd = -1;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
241 }
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
242 }
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
243
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
244 #ifdef DEBUG_AUDIO
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
245 void
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
246 OBSD_Status(_THIS)
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
247 {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
248 audio_info_t info;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
249
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
250 if(ioctl(audio_fd, AUDIO_GETINFO, &info) < 0) {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
251 fprintf(stderr,"AUDIO_GETINFO failed.\n");
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
252 return;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
253 }
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
254
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
255 fprintf(stderr,"\n"
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
256 "[play/record info]\n"
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
257 "buffer size : %d bytes\n"
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
258 "sample rate : %i Hz\n"
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
259 "channels : %i\n"
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
260 "precision : %i-bit\n"
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
261 "encoding : 0x%x\n"
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
262 "seek : %i\n"
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
263 "sample count : %i\n"
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
264 "EOF count : %i\n"
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
265 "paused : %s\n"
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
266 "error occured : %s\n"
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
267 "waiting : %s\n"
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
268 "active : %s\n"
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
269 "",
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
270 info.play.buffer_size,
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
271 info.play.sample_rate,
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
272 info.play.channels,
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
273 info.play.precision,
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
274 info.play.encoding,
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
275 info.play.seek,
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
276 info.play.samples,
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
277 info.play.eof,
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
278 info.play.pause ? "yes" : "no",
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
279 info.play.error ? "yes" : "no",
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
280 info.play.waiting ? "yes" : "no",
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
281 info.play.active ? "yes": "no");
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
282
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
283 fprintf(stderr,"\n"
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
284 "[audio info]\n"
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
285 "monitor_gain : %i\n"
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
286 "hw block size : %d bytes\n"
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
287 "hi watermark : %i\n"
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
288 "lo watermark : %i\n"
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
289 "audio mode : %s\n"
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
290 "",
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
291 info.monitor_gain,
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
292 info.blocksize,
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
293 info.hiwat, info.lowat,
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
294 (info.mode == AUMODE_PLAY) ? "PLAY"
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
295 : (info.mode = AUMODE_RECORD) ? "RECORD"
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
296 : (info.mode == AUMODE_PLAY_ALL ? "PLAY_ALL"
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
297 : "?"));
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
298 }
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
299 #endif /* DEBUG_AUDIO */
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
300
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
301 static int
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
302 OBSD_OpenAudio(_THIS, SDL_AudioSpec *spec)
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
303 {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
304 char audiodev[64];
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
305 Uint16 format;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
306 audio_info_t info;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
307
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
308 AUDIO_INITINFO(&info);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
309
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
310 /* Calculate the final parameters for this audio specification */
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
311 SDL_CalculateAudioSpec(spec);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
312
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
313 #ifdef USE_TIMER_SYNC
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
314 frame_ticks = 0.0;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
315 #endif
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
316
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
317 /* Open the audio device */
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
318 audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
319 if(audio_fd < 0) {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
320 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
321 return(-1);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
322 }
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
323
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
324 /* Set to play mode */
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
325 info.mode = AUMODE_PLAY;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
326 if(ioctl(audio_fd, AUDIO_SETINFO, &info) < 0) {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
327 SDL_SetError("Couldn't put device into play mode");
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
328 return(-1);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
329 }
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
330
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
331 mixbuf = NULL;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
332 AUDIO_INITINFO(&info);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
333 for (format = SDL_FirstAudioFormat(spec->format);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
334 format; format = SDL_NextAudioFormat())
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
335 {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
336 switch(format) {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
337 case AUDIO_U8:
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
338 info.play.encoding = AUDIO_ENCODING_ULINEAR;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
339 info.play.precision = 8;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
340 break;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
341 case AUDIO_S8:
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
342 info.play.encoding = AUDIO_ENCODING_SLINEAR;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
343 info.play.precision = 8;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
344 break;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
345 case AUDIO_S16LSB:
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
346 info.play.encoding = AUDIO_ENCODING_SLINEAR_LE;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
347 info.play.precision = 16;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
348 break;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
349 case AUDIO_S16MSB:
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
350 info.play.encoding = AUDIO_ENCODING_SLINEAR_BE;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
351 info.play.precision = 16;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
352 break;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
353 case AUDIO_U16LSB:
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
354 info.play.encoding = AUDIO_ENCODING_ULINEAR_LE;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
355 info.play.precision = 16;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
356 break;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
357 case AUDIO_U16MSB:
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
358 info.play.encoding = AUDIO_ENCODING_ULINEAR_BE;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
359 info.play.precision = 16;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
360 break;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
361 default:
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
362 continue;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
363 }
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
364 if (ioctl(audio_fd, AUDIO_SETINFO, &info) == 0)
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
365 break;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
366 }
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
367
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
368 if(!format) {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
369 SDL_SetError("No supported encoding for 0x%x", spec->format);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
370 return(-1);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
371 }
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
372
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
373 spec->format = format;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
374
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
375 AUDIO_INITINFO(&info);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
376 info.play.channels = spec->channels;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
377 if (ioctl(audio_fd, AUDIO_SETINFO, &info) == -1)
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
378 spec->channels = 1;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
379 AUDIO_INITINFO(&info);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
380 info.play.sample_rate = spec->freq;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
381 info.blocksize = spec->size;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
382 info.hiwat = 5;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
383 info.lowat = 3;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
384 (void)ioctl(audio_fd, AUDIO_SETINFO, &info);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
385 (void)ioctl(audio_fd, AUDIO_GETINFO, &info);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
386 spec->freq = info.play.sample_rate;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
387 /* Allocate mixing buffer */
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
388 mixlen = spec->size;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
389 mixbuf = (Uint8*)SDL_AllocAudioMem(mixlen);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
390 if(mixbuf == NULL) {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
391 return(-1);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
392 }
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
393 SDL_memset(mixbuf, spec->silence, spec->size);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
394
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
395 /* Get the parent process id (we're the parent of the audio thread) */
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
396 parent = getpid();
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
397
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
398 #ifdef DEBUG_AUDIO
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
399 OBSD_Status(this);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
400 #endif
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
401
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
402 /* We're ready to rock and roll. :-) */
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
403 return(0);
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
404 }