Mercurial > sdl-ios-xcode

annotate src/audio/dsp/SDL_dspaudio.c @ 3807:da371472162f SDL-ryan-multiple-audio-device

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DART allegedly does up to quad output.
author Ryan C. Gordon <icculus@icculus.org>
date Wed, 04 Oct 2006 22:51:30 +0000
parents c8b3d3d13ed1
children 2c5387c0a642
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21
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22 Modified in Oct 2004 by Hannu Savolainen
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23 hannu@opensound.com
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24 */
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25 #include "SDL_config.h"
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26
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27 /* Allow access to a raw mixing buffer */
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28
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29 #include <stdio.h> /* For perror() */
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30 #include <string.h> /* For strerror() */
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31 #include <errno.h>
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32 #include <unistd.h>
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33 #include <fcntl.h>
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34 #include <signal.h>
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35 #include <sys/time.h>
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36 #include <sys/ioctl.h>
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37 #include <sys/stat.h>
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38
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39 #if SDL_AUDIO_DRIVER_OSS_SOUNDCARD_H
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40 /* This is installed on some systems */
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41 #include <soundcard.h>
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42 #else
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43 /* This is recommended by OSS */
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44 #include <sys/soundcard.h>
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45 #endif
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46
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47 #include "SDL_timer.h"
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48 #include "SDL_audio.h"
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49 #include "../SDL_audiomem.h"
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50 #include "../SDL_audio_c.h"
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51 #include "../SDL_audiodev_c.h"
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52 #include "SDL_dspaudio.h"
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53
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54 /* The tag name used by DSP audio */
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55 #define DSP_DRIVER_NAME "dsp"
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56
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57 /* Open the audio device for playback, and don't block if busy */
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58 #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK)
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59
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60 /* Audio driver functions */
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61 static int DSP_DetectDevices(int iscapture);
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62 static const char *DSP_GetDeviceName(int index, int iscapture);
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63 static int DSP_OpenDevice(_THIS, const char *devname, int iscapture);
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64 static void DSP_WaitDevice(_THIS);
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65 static void DSP_PlayDevice(_THIS);
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66 static Uint8 *DSP_GetDeviceBuf(_THIS);
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67 static void DSP_CloseDevice(_THIS);
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68
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69 /* Audio driver bootstrap functions */
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70
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71 static int
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72 DSP_Available(void)
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73 {
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74 /*
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75 * !!! FIXME: maybe change this to always available, and move this to
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76 * !!! FIXME: to device enumeration and opening?
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77 */
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78 int fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0);
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79 int available = 0;
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80 if (fd >= 0) {
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81 available = 1;
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82 close(fd);
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83 }
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84 return (available);
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85 }
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86
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87
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88 static int
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89 DSP_Init(SDL_AudioDriverImpl *impl)
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90 {
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91 /* Set the function pointers */
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92 impl->DetectDevices = DSP_DetectDevices;
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93 impl->GetDeviceName = DSP_GetDeviceName;
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94 impl->OpenDevice = DSP_OpenDevice;
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95 impl->WaitDevice = DSP_WaitDevice;
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96 impl->PlayDevice = DSP_PlayDevice;
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97 impl->GetDeviceBuf = DSP_GetDeviceBuf;
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98 impl->CloseDevice = DSP_CloseDevice;
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99
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100 return 1;
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101 }
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102
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103
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104 AudioBootStrap DSP_bootstrap = {
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105 DSP_DRIVER_NAME, "OSS /dev/dsp standard audio",
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106 DSP_Available, DSP_Init, 0
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107 };
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108
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109
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110 static int
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111 DSP_DetectDevices(int iscapture)
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112 {
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113 return -1; /* !!! FIXME */
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114 }
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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 SDL_SetError("No such device"); /* !!! FIXME */
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121 return NULL;
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122 }
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123
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124
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125 static int
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126 DSP_OpenDevice(_THIS, const char *devname, int iscapture)
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127 {
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128 char dev[1024];
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129 int format;
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130 int value;
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131 int frag_spec;
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132 SDL_AudioFormat test_format;
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133
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134 /* Initialize all variables that we clean on shutdown */
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135 this->hidden = (struct SDL_PrivateAudioData *)
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136 SDL_malloc((sizeof *this->hidden));
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diff changeset
137 if (this->hidden == NULL) {
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
138 SDL_OutOfMemory();
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
139 return 0;
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
140 }
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
141 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
142 this->hidden->audio_fd = -1;
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
143
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
144 /* !!! FIXME: handle devname */
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
145 /* !!! FIXME: handle iscapture */
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
146
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
147 /* Open the audio device */
3795
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
148 this->hidden->audio_fd = SDL_OpenAudioPath(dev, sizeof(dev), OPEN_FLAGS, 0);
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
149 if (this->hidden->audio_fd < 0) {
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
150 SDL_SetError("Couldn't open %s: %s", dev, strerror(errno));
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
151 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
152 }
3795
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
153 this->hidden->mixbuf = NULL;
968
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Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
154
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
155 /* 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
156 {
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
157 long flags;
3795
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
158 flags = fcntl(this->hidden->audio_fd, F_GETFL);
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
159 flags &= ~O_NONBLOCK;
3795
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
160 if (fcntl(this->hidden->audio_fd, F_SETFL, flags) < 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
161 SDL_SetError("Couldn't set audio blocking mode");
3795
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
162 DSP_CloseDevice(this);
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
163 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
164 }
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
165 }
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
166
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
167 /* Get a list of supported hardware formats */
3795
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
168 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
169 perror("SNDCTL_DSP_GETFMTS");
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
170 SDL_SetError("Couldn't get audio format list");
3795
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
171 DSP_CloseDevice(this);
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
172 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
173 }
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
174
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
175 /* 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
176 format = 0;
3795
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
177 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
178 !format && test_format;) {
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
179 #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
180 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
181 #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
182 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
183 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
184 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
185 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
186 }
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
187 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
188 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
189 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
190 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
191 }
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
192 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
193 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
194 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
195 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
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 break;
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
198 #if 0
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
199 /*
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
200 * 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
201 * needed here.
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
202 */
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 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
204 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
205 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
206 }
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 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
208 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
209 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
210 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
211 }
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 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
213 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
214 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
215 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
216 }
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 break;
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
218 #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
219 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
220 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
221 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
222 }
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 if (!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
224 test_format = SDL_NextAudioFormat();
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 }
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 }
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 if (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
228 SDL_SetError("Couldn't find any hardware audio formats");
3795
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
229 DSP_CloseDevice(this);
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
230 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
231 }
3795
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
232 this->spec.format = test_format;
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
233
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
234 /* Set the 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
235 value = format;
3795
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
236 if ( (ioctl(this->hidden->audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) ||
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
237 (value != 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
238 perror("SNDCTL_DSP_SETFMT");
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 SDL_SetError("Couldn't set audio format");
3795
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
240 DSP_CloseDevice(this);
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
241 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
242 }
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
243
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
244 /* Set the number of channels of output */
3795
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
245 value = this->spec.channels;
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
246 if (ioctl(this->hidden->audio_fd, SNDCTL_DSP_CHANNELS, &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
247 perror("SNDCTL_DSP_CHANNELS");
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 SDL_SetError("Cannot set the number of channels");
3795
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
249 DSP_CloseDevice(this);
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
250 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
251 }
3795
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
252 this->spec.channels = value;
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 960
diff changeset
253
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
254 /* Set the DSP frequency */
3795
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
255 value = this->spec.freq;
589bc3d060cd More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
256 if (ioctl(this->hidden->audio_fd, SNDCTL_DSP_SPEED, &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
257 perror("SNDCTL_DSP_SPEED");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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258 SDL_SetError("Couldn't set audio frequency");
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diff changeset
259 DSP_CloseDevice(this);
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260 return 0;
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261 }
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262 this->spec.freq = value;
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263
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264 /* Calculate the final parameters for this audio specification */
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265 SDL_CalculateAudioSpec(&this->spec);
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266
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267 /* Determine the power of two of the fragment size */
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268 for (frag_spec = 0; (0x01U << frag_spec) < this->spec.size; ++frag_spec);
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diff changeset
269 if ((0x01U << frag_spec) != this->spec.size) {
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270 SDL_SetError("Fragment size must be a power of two");
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diff changeset
271 DSP_CloseDevice(this);
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272 return 0;
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273 }
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274 frag_spec |= 0x00020000; /* two fragments, for low latency */
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275
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276 /* Set the audio buffering parameters */
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277 #ifdef DEBUG_AUDIO
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278 fprintf(stderr, "Requesting %d fragments of size %d\n",
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279 (frag_spec >> 16), 1 << (frag_spec & 0xFFFF));
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280 #endif
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281 if (ioctl(this->hidden->audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0) {
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282 perror("SNDCTL_DSP_SETFRAGMENT");
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283 }
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284 #ifdef DEBUG_AUDIO
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285 {
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286 audio_buf_info info;
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287 ioctl(this->hidden->audio_fd, SNDCTL_DSP_GETOSPACE, &info);
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288 fprintf(stderr, "fragments = %d\n", info.fragments);
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289 fprintf(stderr, "fragstotal = %d\n", info.fragstotal);
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290 fprintf(stderr, "fragsize = %d\n", info.fragsize);
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291 fprintf(stderr, "bytes = %d\n", info.bytes);
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292 }
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293 #endif
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294
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295 /* Allocate mixing buffer */
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diff changeset
296 this->hidden->mixlen = this->spec.size;
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diff changeset
297 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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diff changeset
298 if (this->hidden->mixbuf == NULL) {
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diff changeset
299 DSP_CloseDevice(this);
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diff changeset
300 return 0;
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301 }
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diff changeset
302 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
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303
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304 /* We're ready to rock and roll. :-) */
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diff changeset
305 return 1;
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306 }
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diff changeset
307
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diff changeset
308
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diff changeset
309 /* This function waits until it is possible to write a full sound buffer */
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diff changeset
310 static void
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diff changeset
311 DSP_WaitDevice(_THIS)
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diff changeset
312 {
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diff changeset
313 /* Not needed at all since OSS handles waiting automagically */
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diff changeset
314 }
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diff changeset
315
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diff changeset
316
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diff changeset
317 static void
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diff changeset
318 DSP_PlayDevice(_THIS)
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diff changeset
319 {
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diff changeset
320 const Uint8 *mixbuf = this->hidden->mixbuf;
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diff changeset
321 const int mixlen = this->hidden->mixlen;
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diff changeset
322 if (write(this->hidden->audio_fd, mixbuf, mixlen) == -1) {
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diff changeset
323 perror("Audio write");
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diff changeset
324 this->enabled = 0;
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diff changeset
325 }
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diff changeset
326 #ifdef DEBUG_AUDIO
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diff changeset
327 fprintf(stderr, "Wrote %d bytes of audio data\n", mixlen);
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diff changeset
328 #endif
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diff changeset
329 }
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diff changeset
330
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diff changeset
331 static Uint8 *
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diff changeset
332 DSP_GetDeviceBuf(_THIS)
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diff changeset
333 {
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diff changeset
334 return (this->hidden->mixbuf);
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diff changeset
335 }
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diff changeset
336
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diff changeset
337 static void
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diff changeset
338 DSP_CloseDevice(_THIS)
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diff changeset
339 {
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diff changeset
340 if (this->hidden != NULL) {
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diff changeset
341 if (this->hidden->mixbuf != NULL) {
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diff changeset
342 SDL_FreeAudioMem(this->hidden->mixbuf);
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diff changeset
343 this->hidden->mixbuf = NULL;
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diff changeset
344 }
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diff changeset
345 if (this->hidden->audio_fd >= 0) {
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diff changeset
346 close(this->hidden->audio_fd);
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diff changeset
347 this->hidden->audio_fd = -1;
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diff changeset
348 }
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diff changeset
349 SDL_free(this->hidden);
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diff changeset
350 this->hidden = NULL;
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diff changeset
351 }
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diff changeset
352 }
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diff changeset
353
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diff changeset
354 /* vi: set ts=4 sw=4 expandtab: */