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annotate src/audio/dsp/SDL_dspaudio.c @ 2060:866052b01ee5

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indent is evil
author Sam Lantinga <slouken@libsdl.org>
date Sat, 28 Oct 2006 16:48:03 +0000
parents 5f6550e5184f
children 579abbb51f80
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_OUTPUT (O_WRONLY|O_NONBLOCK)
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59 #define OPEN_FLAGS_INPUT (O_RDONLY|O_NONBLOCK)
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60
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61 static char **outputDevices = NULL;
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62 static int outputDeviceCount = 0;
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63 static char **inputDevices = NULL;
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64 static int inputDeviceCount = 0;
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65
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66 static inline void
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67 free_device_list(char ***devs, int *count)
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68 {
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69 SDL_FreeUnixAudioDevices(devs, count);
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70 }
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71
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72 static inline void
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73 build_device_list(int iscapture, char ***devs, int *count)
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74 {
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75 const int flags = ((iscapture) ? OPEN_FLAGS_INPUT : OPEN_FLAGS_OUTPUT);
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76 free_device_list(devs, count);
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77 SDL_EnumUnixAudioDevices(flags, 0, NULL, devs, count);
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78 }
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79
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80 static inline void
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81 build_device_lists(void)
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82 {
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83 build_device_list(0, &outputDevices, &outputDeviceCount);
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84 build_device_list(1, &inputDevices, &inputDeviceCount);
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85 }
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86
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87
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88 static inline void
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89 free_device_lists(void)
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90 {
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91 free_device_list(&outputDevices, &outputDeviceCount);
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92 free_device_list(&inputDevices, &inputDeviceCount);
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93 }
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94
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95
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96 static void
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97 DSP_Deinitialize(void)
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98 {
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99 free_device_lists();
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100 }
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101
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102
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103 static int
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104 DSP_DetectDevices(int iscapture)
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105 {
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106 if (iscapture) {
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107 build_device_list(1, &inputDevices, &inputDeviceCount);
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108 return inputDeviceCount;
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109 } else {
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110 build_device_list(0, &outputDevices, &outputDeviceCount);
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111 return outputDeviceCount;
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112 }
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113
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114 return 0; /* shouldn't ever hit this. */
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115 }
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116
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117 static const char *
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118 DSP_GetDeviceName(int index, int iscapture)
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119 {
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120 if ((iscapture) && (index < inputDeviceCount)) {
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121 return inputDevices[index];
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122 } else if ((!iscapture) && (index < outputDeviceCount)) {
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123 return outputDevices[index];
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124 }
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125
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126 SDL_SetError("No such device");
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127 return NULL;
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128 }
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129
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130
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131 static void
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132 DSP_CloseDevice(_THIS)
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133 {
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diff changeset
134 if (this->hidden != NULL) {
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parents: 1982
diff changeset
135 if (this->hidden->mixbuf != NULL) {
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parents: 1982
diff changeset
136 SDL_FreeAudioMem(this->hidden->mixbuf);
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parents: 1982
diff changeset
137 this->hidden->mixbuf = NULL;
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Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
138 }
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
139 if (this->hidden->audio_fd >= 0) {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
140 close(this->hidden->audio_fd);
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parents: 1982
diff changeset
141 this->hidden->audio_fd = -1;
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parents: 1982
diff changeset
142 }
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
143 SDL_free(this->hidden);
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parents: 1982
diff changeset
144 this->hidden = NULL;
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diff changeset
145 }
0
74212992fb08 Initial revision
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parents:
diff changeset
146 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
147
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diff changeset
148
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diff changeset
149 static int
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parents: 1982
diff changeset
150 DSP_OpenDevice(_THIS, const char *devname, int iscapture)
0
74212992fb08 Initial revision
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parents:
diff changeset
151 {
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parents: 1982
diff changeset
152 const int flags = ((iscapture) ? OPEN_FLAGS_INPUT : OPEN_FLAGS_OUTPUT);
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diff changeset
153 int format;
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diff changeset
154 int value;
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Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
155 int frag_spec;
1982
3b4ce57c6215 First shot at new audio data types (int32 and float32).
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
156 SDL_AudioFormat test_format;
0
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
157
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diff changeset
158 /* We don't care what the devname is...we'll try to open anything. */
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Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
159 /* ...but default to first name in the list... */
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Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
160 if (devname == NULL) {
2060
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parents: 2049
diff changeset
161 if (((iscapture) && (inputDeviceCount == 0)) ||
866052b01ee5 indent is evil
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parents: 2049
diff changeset
162 ((!iscapture) && (outputDeviceCount == 0))) {
2049
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Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
163 SDL_SetError("No such audio device");
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
164 return 0;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
165 }
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
166 devname = ((iscapture) ? inputDevices[0] : outputDevices[0]);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
167 }
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
168
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
169 /* Initialize all variables that we clean on shutdown */
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
170 this->hidden = (struct SDL_PrivateAudioData *)
2060
866052b01ee5 indent is evil
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diff changeset
171 SDL_malloc((sizeof *this->hidden));
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
172 if (this->hidden == NULL) {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
173 SDL_OutOfMemory();
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
174 return 0;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
175 }
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
176 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
177
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
178 /* Open the audio device */
2049
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Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
179 this->hidden->audio_fd = open(devname, flags, 0);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
180 if (this->hidden->audio_fd < 0) {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
181 DSP_CloseDevice(this);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
182 SDL_SetError("Couldn't open %s: %s", devname, strerror(errno));
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
183 return 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
184 }
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
185 this->hidden->mixbuf = NULL;
968
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parents: 960
diff changeset
186
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1612
diff changeset
187 /* Make the file descriptor use blocking writes with fcntl() */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
188 {
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
189 long ctlflags;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
190 ctlflags = fcntl(this->hidden->audio_fd, F_GETFL);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
191 ctlflags &= ~O_NONBLOCK;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
192 if (fcntl(this->hidden->audio_fd, F_SETFL, ctlflags) < 0) {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
193 DSP_CloseDevice(this);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1612
diff changeset
194 SDL_SetError("Couldn't set audio blocking mode");
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
195 return 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
196 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
197 }
968
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parents: 960
diff changeset
198
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
199 /* Get a list of supported hardware formats */
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
200 if (ioctl(this->hidden->audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0) {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
201 perror("SNDCTL_DSP_GETFMTS");
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
202 DSP_CloseDevice(this);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
203 SDL_SetError("Couldn't get audio format list");
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
204 return 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
205 }
968
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Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
206
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
207 /* Try for a closest match on audio format */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
208 format = 0;
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
209 for (test_format = SDL_FirstAudioFormat(this->spec.format);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
210 !format && test_format;) {
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
211 #ifdef DEBUG_AUDIO
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
212 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
213 #endif
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
214 switch (test_format) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
215 case AUDIO_U8:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
216 if (value & AFMT_U8) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
217 format = AFMT_U8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
218 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
219 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
220 case AUDIO_S16LSB:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
221 if (value & AFMT_S16_LE) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
222 format = AFMT_S16_LE;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
223 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
224 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
225 case AUDIO_S16MSB:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
226 if (value & AFMT_S16_BE) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
227 format = AFMT_S16_BE;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
228 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
229 break;
968
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 */
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
235 case AUDIO_S8:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
236 if (value & AFMT_S8) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
237 format = AFMT_S8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
238 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
239 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
240 case AUDIO_U16LSB:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
241 if (value & AFMT_U16_LE) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
242 format = AFMT_U16_LE;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
243 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
244 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
245 case AUDIO_U16MSB:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
246 if (value & AFMT_U16_BE) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
247 format = AFMT_U16_BE;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
248 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
249 break;
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
250 #endif
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
251 default:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
252 format = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
253 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
254 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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255 if (!format) {
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diff changeset
256 test_format = SDL_NextAudioFormat();
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257 }
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258 }
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diff changeset
259 if (format == 0) {
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diff changeset
260 DSP_CloseDevice(this);
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261 SDL_SetError("Couldn't find any hardware audio formats");
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diff changeset
262 return 0;
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263 }
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diff changeset
264 this->spec.format = test_format;
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265
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266 /* Set the audio format */
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267 value = format;
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diff changeset
268 if ((ioctl(this->hidden->audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) ||
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diff changeset
269 (value != format)) {
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270 perror("SNDCTL_DSP_SETFMT");
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diff changeset
271 DSP_CloseDevice(this);
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272 SDL_SetError("Couldn't set audio format");
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273 return 0;
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274 }
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275
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276 /* Set the number of channels of output */
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diff changeset
277 value = this->spec.channels;
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diff changeset
278 if (ioctl(this->hidden->audio_fd, SNDCTL_DSP_CHANNELS, &value) < 0) {
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279 perror("SNDCTL_DSP_CHANNELS");
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diff changeset
280 DSP_CloseDevice(this);
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281 SDL_SetError("Cannot set the number of channels");
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282 return 0;
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283 }
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diff changeset
284 this->spec.channels = value;
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285
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286 /* Set the DSP frequency */
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diff changeset
287 value = this->spec.freq;
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diff changeset
288 if (ioctl(this->hidden->audio_fd, SNDCTL_DSP_SPEED, &value) < 0) {
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289 perror("SNDCTL_DSP_SPEED");
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diff changeset
290 DSP_CloseDevice(this);
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291 SDL_SetError("Couldn't set audio frequency");
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diff changeset
292 return 0;
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293 }
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294 this->spec.freq = value;
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295
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diff changeset
296 /* Calculate the final parameters for this audio specification */
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diff changeset
297 SDL_CalculateAudioSpec(&this->spec);
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298
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diff changeset
299 /* Determine the power of two of the fragment size */
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diff changeset
300 for (frag_spec = 0; (0x01U << frag_spec) < this->spec.size; ++frag_spec);
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diff changeset
301 if ((0x01U << frag_spec) != this->spec.size) {
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diff changeset
302 DSP_CloseDevice(this);
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diff changeset
303 SDL_SetError("Fragment size must be a power of two");
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diff changeset
304 return 0;
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diff changeset
305 }
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diff changeset
306 frag_spec |= 0x00020000; /* two fragments, for low latency */
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diff changeset
307
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diff changeset
308 /* Set the audio buffering parameters */
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diff changeset
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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diff changeset
312 #endif
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diff changeset
313 if (ioctl(this->hidden->audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0) {
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314 perror("SNDCTL_DSP_SETFRAGMENT");
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315 }
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diff changeset
316 #ifdef DEBUG_AUDIO
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317 {
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diff changeset
318 audio_buf_info info;
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diff changeset
319 ioctl(this->hidden->audio_fd, SNDCTL_DSP_GETOSPACE, &info);
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320 fprintf(stderr, "fragments = %d\n", info.fragments);
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diff changeset
321 fprintf(stderr, "fragstotal = %d\n", info.fragstotal);
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322 fprintf(stderr, "fragsize = %d\n", info.fragsize);
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diff changeset
323 fprintf(stderr, "bytes = %d\n", info.bytes);
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324 }
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diff changeset
325 #endif
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diff changeset
326
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327 /* Allocate mixing buffer */
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diff changeset
328 this->hidden->mixlen = this->spec.size;
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diff changeset
329 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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parents: 1982
diff changeset
330 if (this->hidden->mixbuf == NULL) {
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diff changeset
331 DSP_CloseDevice(this);
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parents: 1982
diff changeset
332 SDL_OutOfMemory();
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diff changeset
333 return 0;
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334 }
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diff changeset
335 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
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diff changeset
336
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diff changeset
337 /* We're ready to rock and roll. :-) */
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diff changeset
338 return 1;
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parents: 1982
diff changeset
339 }
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
340
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
341
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
342 static void
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 1982
diff changeset
343 DSP_PlayDevice(_THIS)
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 1982
diff changeset
344 {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 1982
diff changeset
345 const Uint8 *mixbuf = this->hidden->mixbuf;
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parents: 1982
diff changeset
346 const int mixlen = this->hidden->mixlen;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 1982
diff changeset
347 if (write(this->hidden->audio_fd, mixbuf, mixlen) == -1) {
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parents: 1982
diff changeset
348 perror("Audio write");
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diff changeset
349 this->enabled = 0;
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diff changeset
350 }
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
351 #ifdef DEBUG_AUDIO
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parents: 1982
diff changeset
352 fprintf(stderr, "Wrote %d bytes of audio data\n", mixlen);
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diff changeset
353 #endif
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diff changeset
354 }
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355
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diff changeset
356 static Uint8 *
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diff changeset
357 DSP_GetDeviceBuf(_THIS)
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
358 {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 1982
diff changeset
359 return (this->hidden->mixbuf);
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parents: 1982
diff changeset
360 }
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
361
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diff changeset
362 static int
2060
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diff changeset
363 DSP_Init(SDL_AudioDriverImpl * impl)
2049
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diff changeset
364 {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 1982
diff changeset
365 /* Set the function pointers */
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diff changeset
366 impl->DetectDevices = DSP_DetectDevices;
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parents: 1982
diff changeset
367 impl->GetDeviceName = DSP_GetDeviceName;
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parents: 1982
diff changeset
368 impl->OpenDevice = DSP_OpenDevice;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 1982
diff changeset
369 impl->PlayDevice = DSP_PlayDevice;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 1982
diff changeset
370 impl->GetDeviceBuf = DSP_GetDeviceBuf;
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parents: 1982
diff changeset
371 impl->CloseDevice = DSP_CloseDevice;
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parents: 1982
diff changeset
372 impl->Deinitialize = DSP_Deinitialize;
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diff changeset
373
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parents: 1982
diff changeset
374 build_device_lists();
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
375 return 1;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
376 }
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
377
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
378
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
379 AudioBootStrap DSP_bootstrap = {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
380 DSP_DRIVER_NAME, "OSS /dev/dsp standard audio", DSP_Init, 0
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
381 };
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
382
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
diff changeset
383 /* vi: set ts=4 sw=4 expandtab: */