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annotate src/audio/SDL_audiodev.c @ 3096:ae4e80dbe330

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Date: Tue, 17 Feb 2009 14:00:25 +0100 From: Stefan Klug Subject: [SDL] Possible bug, paused audio playing garbage On my WinCE device a paused audio device plays random garbage. This might also be the issue in the thread "sound cracks with SDL_mixer and AUDIO_S16LSB" I don't have that much knowledge of the SDL audio part, but the attached patch fixes it for me, and collapses two redundant ifs. I'm not sure if this is the correct way to fix this. Shouldn't the complete stream conversion part of the RunAudio loop be dependent on the paused property of the device? (not only the call to (*fill)(udata, istream, istream_len). Anyways. Would be great if the patch or a fix could find its way to SVN ;-) Cheers Stefan
author Sam Lantinga <slouken@libsdl.org>
date Mon, 23 Mar 2009 05:21:40 +0000
parents 99210400e8b9
children f7b03b6838cb
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 #include "SDL_config.h"
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23
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24 /* Get the name of the audio device we use for output */
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25
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26 #if SDL_AUDIO_DRIVER_BSD || SDL_AUDIO_DRIVER_OSS || SDL_AUDIO_DRIVER_SUNAUDIO
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27
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28 #include <fcntl.h>
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29 #include <sys/types.h>
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30 #include <sys/stat.h>
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31
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32 #include "SDL_stdinc.h"
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33 #include "SDL_audiodev_c.h"
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34
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35 #ifndef _PATH_DEV_DSP
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36 #if defined(__NETBSD__) || defined(__OPENBSD__)
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37 #define _PATH_DEV_DSP "/dev/audio"
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38 #else
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39 #define _PATH_DEV_DSP "/dev/dsp"
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40 #endif
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41 #endif
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42 #ifndef _PATH_DEV_DSP24
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43 #define _PATH_DEV_DSP24 "/dev/sound/dsp"
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44 #endif
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45 #ifndef _PATH_DEV_AUDIO
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46 #define _PATH_DEV_AUDIO "/dev/audio"
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47 #endif
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48
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49 static inline void
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50 test_device(const char *fname, int flags, int (*test) (int fd),
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51 char ***devices, int *devCount)
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52 {
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53 struct stat sb;
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54 if ((stat(fname, &sb) == 0) && (S_ISCHR(sb.st_mode))) {
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55 int audio_fd = open(fname, flags, 0);
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56 if ((audio_fd >= 0) && (test(audio_fd))) {
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57 void *p =
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58 SDL_realloc(*devices, ((*devCount) + 1) * sizeof(char *));
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59 if (p != NULL) {
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60 size_t len = strlen(fname) + 1;
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61 char *str = (char *) SDL_malloc(len);
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62 *devices = (char **) p;
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63 if (str != NULL) {
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64 SDL_strlcpy(str, fname, len);
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65 (*devices)[(*devCount)++] = str;
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66 }
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67 }
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68 close(audio_fd);
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69 }
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70 }
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71 }
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72
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73 void
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74 SDL_FreeUnixAudioDevices(char ***devices, int *devCount)
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75 {
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76 int i = *devCount;
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77 if ((i > 0) && (*devices != NULL)) {
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78 while (i--) {
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79 SDL_free((*devices)[i]);
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80 }
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81 }
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82
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83 if (*devices != NULL) {
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84 SDL_free(*devices);
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85 }
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86
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87 *devices = NULL;
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88 *devCount = 0;
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89 }
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90
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91 static int
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92 test_stub(int fd)
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93 {
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94 return 1;
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95 }
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96
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97 void
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98 SDL_EnumUnixAudioDevices(int flags, int classic, int (*test) (int fd),
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99 char ***devices, int *devCount)
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100 {
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101 const char *audiodev;
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102 char audiopath[1024];
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103
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104 if (test == NULL)
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105 test = test_stub;
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106
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107 /* Figure out what our audio device is */
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108 if (((audiodev = SDL_getenv("SDL_PATH_DSP")) == NULL) &&
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109 ((audiodev = SDL_getenv("AUDIODEV")) == NULL)) {
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110 if (classic) {
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111 audiodev = _PATH_DEV_AUDIO;
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112 } else {
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113 struct stat sb;
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114
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115 /* Added support for /dev/sound/\* in Linux 2.4 */
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116 if (((stat("/dev/sound", &sb) == 0) && S_ISDIR(sb.st_mode))
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117 && ((stat(_PATH_DEV_DSP24, &sb) == 0)
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118 && S_ISCHR(sb.st_mode))) {
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119 audiodev = _PATH_DEV_DSP24;
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120 } else {
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121 audiodev = _PATH_DEV_DSP;
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122 }
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123 }
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124 }
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125 test_device(audiodev, flags, test, devices, devCount);
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126
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127 if (SDL_strlen(audiodev) < (sizeof(audiopath) - 3)) {
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128 int instance = 0;
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129 while (instance++ <= 64) {
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130 SDL_snprintf(audiopath, SDL_arraysize(audiopath),
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parents: 1895
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131 "%s%d", audiodev, instance);
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132 test_device(audiopath, flags, test, devices, devCount);
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133 }
0
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134 }
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135 }
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136
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137 #endif /* Audio driver selection */
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parents: 1567
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138 /* vi: set ts=4 sw=4 expandtab: */