Mercurial > sdl-ios-xcode

annotate src/audio/esd/SDL_esdaudio.c @ 2938:2929ed239d2a

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Adjusted default choice of audio driver. If a driver can definitely see available devices, it is chosen. Otherwise, we'll take the first driver that initializes but saw no devices...this might be because it can't enumerate them, or there really aren't any available. This prevents the dsp driver from hogging control when there are no /dev/dsp* nodes (for example, on a Linux box with ALSA and no OSS emulation).
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 01 Jan 2009 07:54:58 +0000
parents 99210400e8b9
children 1e431c2631ee
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 /* Allow access to an ESD network stream mixing buffer */
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25
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26 #include <sys/types.h>
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27 #include <unistd.h>
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28 #include <signal.h>
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29 #include <errno.h>
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30 #include <esd.h>
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31
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32 #include "SDL_timer.h"
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33 #include "SDL_audio.h"
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34 #include "../SDL_audiomem.h"
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35 #include "../SDL_audio_c.h"
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36 #include "SDL_esdaudio.h"
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37
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38 #ifdef SDL_AUDIO_DRIVER_ESD_DYNAMIC
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39 #include "SDL_name.h"
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40 #include "SDL_loadso.h"
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41 #else
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42 #define SDL_NAME(X) X
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43 #endif
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44
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45 /* The tag name used by ESD audio */
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46 #define ESD_DRIVER_NAME "esd"
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47
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48 #ifdef SDL_AUDIO_DRIVER_ESD_DYNAMIC
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49
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50 static const char *esd_library = SDL_AUDIO_DRIVER_ESD_DYNAMIC;
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51 static void *esd_handle = NULL;
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52
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53 static int (*SDL_NAME(esd_open_sound)) (const char *host);
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54 static int (*SDL_NAME(esd_close)) (int esd);
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55 static int (*SDL_NAME(esd_play_stream)) (esd_format_t format, int rate,
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56 const char *host, const char *name);
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57
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58 #define SDL_ESD_SYM(x) { #x, (void **) (char *) &SDL_NAME(x) }
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59 static struct
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60 {
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61 const char *name;
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62 void **func;
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63 } esd_functions[] = {
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64 SDL_ESD_SYM(esd_open_sound),
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65 SDL_ESD_SYM(esd_close), SDL_ESD_SYM(esd_play_stream),};
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66 #undef SDL_ESD_SYM
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67
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68 static void
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69 UnloadESDLibrary()
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70 {
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71 if (esd_handle != NULL) {
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72 SDL_UnloadObject(esd_handle);
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73 esd_handle = NULL;
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74 }
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75 }
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76
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77 static int
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78 LoadESDLibrary(void)
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79 {
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80 int i, retval = -1;
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81
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82 if (esd_handle == NULL) {
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83 esd_handle = SDL_LoadObject(esd_library);
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84 if (esd_handle) {
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85 retval = 0;
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86 for (i = 0; i < SDL_arraysize(esd_functions); ++i) {
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87 *esd_functions[i].func =
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88 SDL_LoadFunction(esd_handle, esd_functions[i].name);
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89 if (!*esd_functions[i].func) {
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90 retval = -1;
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91 UnloadESDLibrary();
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92 break;
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93 }
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94 }
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95 }
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96 }
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97 return retval;
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98 }
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99
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100 #else
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101
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102 static void
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103 UnloadESDLibrary()
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104 {
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105 return;
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106 }
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107
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108 static int
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109 LoadESDLibrary(void)
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110 {
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111 return 0;
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112 }
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113
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114 #endif /* SDL_AUDIO_DRIVER_ESD_DYNAMIC */
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115
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116
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117 /* This function waits until it is possible to write a full sound buffer */
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118 static void
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119 ESD_WaitDevice(_THIS)
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120 {
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121 Sint32 ticks;
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122
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123 /* Check to see if the thread-parent process is still alive */
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124 {
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125 static int cnt = 0;
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126 /* Note that this only works with thread implementations
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127 that use a different process id for each thread.
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128 */
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129 /* Check every 10 loops */
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130 if (this->hidden->parent && (((++cnt) % 10) == 0)) {
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131 if (kill(this->hidden->parent, 0) < 0) {
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132 this->enabled = 0;
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133 }
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134 }
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135 }
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136
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137 /* Use timer for general audio synchronization */
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138 ticks =
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139 ((Sint32) (this->hidden->next_frame - SDL_GetTicks())) - FUDGE_TICKS;
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140 if (ticks > 0) {
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141 SDL_Delay(ticks);
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142 }
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143 }
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144
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145 static void
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146 ESD_PlayDevice(_THIS)
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147 {
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148 int written = 0;
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149
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150 /* Write the audio data, checking for EAGAIN on broken audio drivers */
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151 do {
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152 written = write(this->hidden->audio_fd,
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153 this->hidden->mixbuf, this->hidden->mixlen);
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154 if ((written < 0) && ((errno == 0) || (errno == EAGAIN))) {
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155 SDL_Delay(1); /* Let a little CPU time go by */
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156 }
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157 } while ((written < 0) &&
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158 ((errno == 0) || (errno == EAGAIN) || (errno == EINTR)));
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159
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160 /* Set the next write frame */
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161 this->hidden->next_frame += this->hidden->frame_ticks;
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162
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163 /* If we couldn't write, assume fatal error for now */
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164 if (written < 0) {
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165 this->enabled = 0;
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166 }
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167 }
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168
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169 static Uint8 *
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170 ESD_GetDeviceBuf(_THIS)
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171 {
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172 return (this->hidden->mixbuf);
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173 }
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174
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175 static void
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176 ESD_CloseDevice(_THIS)
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177 {
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178 if (this->hidden != NULL) {
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179 if (this->hidden->mixbuf != NULL) {
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180 SDL_FreeAudioMem(this->hidden->mixbuf);
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181 this->hidden->mixbuf = NULL;
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182 }
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diff changeset
183 if (this->hidden->audio_fd >= 0) {
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184 SDL_NAME(esd_close) (this->hidden->audio_fd);
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185 this->hidden->audio_fd = -1;
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186 }
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187
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188 SDL_free(this->hidden);
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189 this->hidden = NULL;
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190 }
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191 }
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192
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193 /* Try to get the name of the program */
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194 static char *
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195 get_progname(void)
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196 {
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197 char *progname = NULL;
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198 #ifdef __LINUX__
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199 FILE *fp;
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200 static char temp[BUFSIZ];
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201
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202 SDL_snprintf(temp, SDL_arraysize(temp), "/proc/%d/cmdline", getpid());
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203 fp = fopen(temp, "r");
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204 if (fp != NULL) {
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205 if (fgets(temp, sizeof(temp) - 1, fp)) {
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206 progname = SDL_strrchr(temp, '/');
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207 if (progname == NULL) {
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208 progname = temp;
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diff changeset
209 } else {
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210 progname = progname + 1;
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211 }
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212 }
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213 fclose(fp);
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214 }
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215 #endif
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216 return (progname);
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217 }
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218
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219
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220 static int
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diff changeset
221 ESD_OpenDevice(_THIS, const char *devname, int iscapture)
0
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222 {
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diff changeset
223 esd_format_t format = (ESD_STREAM | ESD_PLAY);
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diff changeset
224 SDL_AudioFormat test_format = 0;
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diff changeset
225 int found = 0;
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226
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diff changeset
227 /* Initialize all variables that we clean on shutdown */
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diff changeset
228 this->hidden = (struct SDL_PrivateAudioData *)
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229 SDL_malloc((sizeof *this->hidden));
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diff changeset
230 if (this->hidden == NULL) {
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diff changeset
231 SDL_OutOfMemory();
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232 return 0;
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diff changeset
233 }
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diff changeset
234 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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235 this->hidden->audio_fd = -1;
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236
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237 /* Convert audio spec to the ESD audio format */
2049
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diff changeset
238 /* Try for a closest match on audio format */
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diff changeset
239 for (test_format = SDL_FirstAudioFormat(this->spec.format);
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diff changeset
240 !found && test_format; test_format = SDL_NextAudioFormat()) {
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diff changeset
241 #ifdef DEBUG_AUDIO
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diff changeset
242 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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diff changeset
243 #endif
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diff changeset
244 found = 1;
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diff changeset
245 switch (test_format) {
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diff changeset
246 case AUDIO_U8:
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diff changeset
247 format |= ESD_BITS8;
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248 break;
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diff changeset
249 case AUDIO_S16SYS:
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diff changeset
250 format |= ESD_BITS16;
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diff changeset
251 break;
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diff changeset
252 default:
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diff changeset
253 found = 0;
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diff changeset
254 break;
2049
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diff changeset
255 }
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256 }
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257
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diff changeset
258 if (!found) {
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diff changeset
259 ESD_CloseDevice(this);
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diff changeset
260 SDL_SetError("Couldn't find any hardware audio formats");
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diff changeset
261 return 0;
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262 }
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263
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264 if (this->spec.channels == 1) {
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265 format |= ESD_MONO;
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266 } else {
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267 format |= ESD_STEREO;
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268 }
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269 #if 0
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270 this->spec.samples = ESD_BUF_SIZE; /* Darn, no way to change this yet */
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271 #endif
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272
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273 /* Open a connection to the ESD audio server */
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274 this->hidden->audio_fd =
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275 SDL_NAME(esd_play_stream) (format, this->spec.freq, NULL,
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276 get_progname());
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277
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278 if (this->hidden->audio_fd < 0) {
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279 ESD_CloseDevice(this);
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280 SDL_SetError("Couldn't open ESD connection");
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281 return 0;
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282 }
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283
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284 /* Calculate the final parameters for this audio specification */
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285 SDL_CalculateAudioSpec(&this->spec);
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286 this->hidden->frame_ticks =
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287 (float) (this->spec.samples * 1000) / this->spec.freq;
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288 this->hidden->next_frame = SDL_GetTicks() + this->hidden->frame_ticks;
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289
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290 /* Allocate mixing buffer */
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291 this->hidden->mixlen = this->spec.size;
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292 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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293 if (this->hidden->mixbuf == NULL) {
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294 ESD_CloseDevice(this);
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295 SDL_OutOfMemory();
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296 return 0;
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297 }
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298 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
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299
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300 /* Get the parent process id (we're the parent of the audio thread) */
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301 this->hidden->parent = getpid();
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302
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303 /* We're ready to rock and roll. :-) */
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304 return 1;
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305 }
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306
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307 static void
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308 ESD_Deinitialize(void)
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309 {
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310 UnloadESDLibrary();
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311 }
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312
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313 static int
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314 ESD_Init(SDL_AudioDriverImpl * impl)
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315 {
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316 if (LoadESDLibrary() < 0) {
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317 return 0;
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318 } else {
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319 int connection = 0;
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320
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321 /* Don't start ESD if it's not running */
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322 if (SDL_getenv("ESD_NO_SPAWN") == NULL) {
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323 SDL_putenv("ESD_NO_SPAWN=1");
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324 }
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325
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326 connection = SDL_NAME(esd_open_sound) (NULL);
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327 if (connection < 0) {
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328 UnloadESDLibrary();
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329 SDL_SetError("ESD: esd_open_sound failed (no audio server?)");
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330 return 0;
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331 }
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332 SDL_NAME(esd_close) (connection);
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333 }
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334
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335 /* Set the function pointers */
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336 impl->OpenDevice = ESD_OpenDevice;
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337 impl->PlayDevice = ESD_PlayDevice;
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338 impl->WaitDevice = ESD_WaitDevice;
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339 impl->GetDeviceBuf = ESD_GetDeviceBuf;
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340 impl->CloseDevice = ESD_CloseDevice;
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341 impl->Deinitialize = ESD_Deinitialize;
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342 impl->OnlyHasDefaultOutputDevice = 1;
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343
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344 return 2; /* return 2 (definitely have a "device"). */
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345 }
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346
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347
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348 AudioBootStrap ESD_bootstrap = {
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349 ESD_DRIVER_NAME, "Enlightened Sound Daemon", ESD_Init, 0
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350 };
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351
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352 /* vi: set ts=4 sw=4 expandtab: */