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annotate src/audio/paudio/SDL_paudio.c @ 1682:7ae8018b2e5d SDL-1.3

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Default palette entries to white, instead of black. More palettized video mode support...
author Sam Lantinga <slouken@libsdl.org>
date Fri, 16 Jun 2006 06:00:31 +0000
parents 4da1ee79c9af
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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 Carsten Griwodz
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20 griff@kom.tu-darmstadt.de
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21
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22 based on linux/SDL_dspaudio.c by Sam Lantinga
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23 */
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24 #include "SDL_config.h"
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25
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26 /* Allow access to a raw mixing buffer */
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27
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28 #include <errno.h>
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29 #include <unistd.h>
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30 #include <fcntl.h>
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31 #include <sys/time.h>
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32 #include <sys/ioctl.h>
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33 #include <sys/stat.h>
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34
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35 #include "SDL_timer.h"
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36 #include "SDL_audio.h"
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37 #include "../SDL_audiomem.h"
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38 #include "../SDL_audio_c.h"
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39 #include "../SDL_audiodev_c.h"
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40 #include "SDL_paudio.h"
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41
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42 #define DEBUG_AUDIO 1
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43
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44 /* A conflict within AIX 4.3.3 <sys/> headers and probably others as well.
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45 * I guess nobody ever uses audio... Shame over AIX header files. */
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46 #include <sys/machine.h>
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47 #undef BIG_ENDIAN
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48 #include <sys/audio.h>
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49
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50 /* The tag name used by paud audio */
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51 #define Paud_DRIVER_NAME "paud"
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52
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53 /* Open the audio device for playback, and don't block if busy */
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54 /* #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK) */
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55 #define OPEN_FLAGS O_WRONLY
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56
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57 /* Audio driver functions */
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58 static int Paud_OpenAudio(_THIS, SDL_AudioSpec * spec);
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59 static void Paud_WaitAudio(_THIS);
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60 static void Paud_PlayAudio(_THIS);
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61 static Uint8 *Paud_GetAudioBuf(_THIS);
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62 static void Paud_CloseAudio(_THIS);
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63
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64 /* Audio driver bootstrap functions */
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65
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66 static int
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67 Audio_Available(void)
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68 {
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69 int fd;
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70 int available;
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71
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72 available = 0;
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73 fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0);
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74 if (fd >= 0) {
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75 available = 1;
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76 close(fd);
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77 }
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78 return (available);
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79 }
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80
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81 static void
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82 Audio_DeleteDevice(SDL_AudioDevice * device)
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83 {
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84 SDL_free(device->hidden);
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85 SDL_free(device);
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86 }
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87
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88 static SDL_AudioDevice *
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89 Audio_CreateDevice(int devindex)
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90 {
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91 SDL_AudioDevice *this;
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92
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93 /* Initialize all variables that we clean on shutdown */
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94 this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
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95 if (this) {
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96 SDL_memset(this, 0, (sizeof *this));
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97 this->hidden = (struct SDL_PrivateAudioData *)
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98 SDL_malloc((sizeof *this->hidden));
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99 }
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100 if ((this == NULL) || (this->hidden == NULL)) {
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101 SDL_OutOfMemory();
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102 if (this) {
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103 SDL_free(this);
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104 }
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105 return (0);
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106 }
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107 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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108 audio_fd = -1;
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109
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110 /* Set the function pointers */
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111 this->OpenAudio = Paud_OpenAudio;
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112 this->WaitAudio = Paud_WaitAudio;
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113 this->PlayAudio = Paud_PlayAudio;
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114 this->GetAudioBuf = Paud_GetAudioBuf;
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115 this->CloseAudio = Paud_CloseAudio;
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116
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117 this->free = Audio_DeleteDevice;
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118
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119 return this;
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120 }
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121
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122 AudioBootStrap Paud_bootstrap = {
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123 Paud_DRIVER_NAME, "AIX Paudio",
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124 Audio_Available, Audio_CreateDevice
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125 };
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126
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127 /* This function waits until it is possible to write a full sound buffer */
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128 static void
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129 Paud_WaitAudio(_THIS)
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130 {
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131 fd_set fdset;
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132
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133 /* See if we need to use timed audio synchronization */
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134 if (frame_ticks) {
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135 /* Use timer for general audio synchronization */
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136 Sint32 ticks;
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137
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138 ticks = ((Sint32) (next_frame - SDL_GetTicks())) - FUDGE_TICKS;
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139 if (ticks > 0) {
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140 SDL_Delay(ticks);
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141 }
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142 } else {
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143 audio_buffer paud_bufinfo;
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144
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145 /* Use select() for audio synchronization */
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146 struct timeval timeout;
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147 FD_ZERO(&fdset);
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148 FD_SET(audio_fd, &fdset);
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149
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150 if (ioctl(audio_fd, AUDIO_BUFFER, &paud_bufinfo) < 0) {
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151 #ifdef DEBUG_AUDIO
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152 fprintf(stderr, "Couldn't get audio buffer information\n");
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153 #endif
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154 timeout.tv_sec = 10;
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155 timeout.tv_usec = 0;
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156 } else {
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157 long ms_in_buf = paud_bufinfo.write_buf_time;
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158 timeout.tv_sec = ms_in_buf / 1000;
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159 ms_in_buf = ms_in_buf - timeout.tv_sec * 1000;
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160 timeout.tv_usec = ms_in_buf * 1000;
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161 #ifdef DEBUG_AUDIO
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162 fprintf(stderr,
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163 "Waiting for write_buf_time=%ld,%ld\n",
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164 timeout.tv_sec, timeout.tv_usec);
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165 #endif
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166 }
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167
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168 #ifdef DEBUG_AUDIO
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169 fprintf(stderr, "Waiting for audio to get ready\n");
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170 #endif
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171 if (select(audio_fd + 1, NULL, &fdset, NULL, &timeout) <= 0) {
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172 const char *message =
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173 "Audio timeout - buggy audio driver? (disabled)";
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174 /*
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175 * In general we should never print to the screen,
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176 * but in this case we have no other way of letting
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177 * the user know what happened.
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178 */
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179 fprintf(stderr, "SDL: %s - %s\n", strerror(errno), message);
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180 this->enabled = 0;
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181 /* Don't try to close - may hang */
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182 audio_fd = -1;
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183 #ifdef DEBUG_AUDIO
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184 fprintf(stderr, "Done disabling audio\n");
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185 #endif
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186 }
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187 #ifdef DEBUG_AUDIO
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188 fprintf(stderr, "Ready!\n");
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189 #endif
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190 }
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191 }
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192
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193 static void
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194 Paud_PlayAudio(_THIS)
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195 {
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196 int written;
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197
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198 /* Write the audio data, checking for EAGAIN on broken audio drivers */
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199 do {
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200 written = write(audio_fd, mixbuf, mixlen);
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201 if ((written < 0) && ((errno == 0) || (errno == EAGAIN))) {
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202 SDL_Delay(1); /* Let a little CPU time go by */
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203 }
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204 }
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205 while ((written < 0) &&
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206 ((errno == 0) || (errno == EAGAIN) || (errno == EINTR)));
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207
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208 /* If timer synchronization is enabled, set the next write frame */
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209 if (frame_ticks) {
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210 next_frame += frame_ticks;
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211 }
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212
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213 /* If we couldn't write, assume fatal error for now */
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214 if (written < 0) {
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215 this->enabled = 0;
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216 }
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217 #ifdef DEBUG_AUDIO
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218 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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219 #endif
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220 }
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221
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222 static Uint8 *
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223 Paud_GetAudioBuf(_THIS)
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224 {
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225 return mixbuf;
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226 }
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227
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228 static void
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229 Paud_CloseAudio(_THIS)
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230 {
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231 if (mixbuf != NULL) {
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232 SDL_FreeAudioMem(mixbuf);
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233 mixbuf = NULL;
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234 }
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235 if (audio_fd >= 0) {
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236 close(audio_fd);
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237 audio_fd = -1;
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238 }
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239 }
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240
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241 static int
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242 Paud_OpenAudio(_THIS, SDL_AudioSpec * spec)
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243 {
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244 char audiodev[1024];
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245 int format;
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246 int bytes_per_sample;
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247 Uint16 test_format;
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248 audio_init paud_init;
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249 audio_buffer paud_bufinfo;
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250 audio_status paud_status;
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251 audio_control paud_control;
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252 audio_change paud_change;
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253
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254 /* Reset the timer synchronization flag */
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255 frame_ticks = 0.0;
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256
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257 /* Open the audio device */
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258 audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0);
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259 if (audio_fd < 0) {
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260 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
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261 return -1;
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262 }
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263
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264 /*
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265 * We can't set the buffer size - just ask the device for the maximum
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266 * that we can have.
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267 */
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268 if (ioctl(audio_fd, AUDIO_BUFFER, &paud_bufinfo) < 0) {
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269 SDL_SetError("Couldn't get audio buffer information");
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270 return -1;
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271 }
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272
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273 mixbuf = NULL;
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274
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275 if (spec->channels > 1)
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276 spec->channels = 2;
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277 else
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278 spec->channels = 1;
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279
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280 /*
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281 * Fields in the audio_init structure:
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282 *
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283 * Ignored by us:
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284 *
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285 * paud.loadpath[LOAD_PATH]; * DSP code to load, MWave chip only?
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286 * paud.slot_number; * slot number of the adapter
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287 * paud.device_id; * adapter identification number
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288 *
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289 * Input:
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290 *
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291 * paud.srate; * the sampling rate in Hz
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292 * paud.bits_per_sample; * 8, 16, 32, ...
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293 * paud.bsize; * block size for this rate
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294 * paud.mode; * ADPCM, PCM, MU_LAW, A_LAW, SOURCE_MIX
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295 * paud.channels; * 1=mono, 2=stereo
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296 * paud.flags; * FIXED - fixed length data
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297 * * LEFT_ALIGNED, RIGHT_ALIGNED (var len only)
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298 * * TWOS_COMPLEMENT - 2's complement data
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299 * * SIGNED - signed? comment seems wrong in sys/audio.h
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300 * * BIG_ENDIAN
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301 * paud.operation; * PLAY, RECORD
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302 *
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303 * Output:
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304 *
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305 * paud.flags; * PITCH - pitch is supported
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306 * * INPUT - input is supported
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307 * * OUTPUT - output is supported
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308 * * MONITOR - monitor is supported
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309 * * VOLUME - volume is supported
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310 * * VOLUME_DELAY - volume delay is supported
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311 * * BALANCE - balance is supported
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312 * * BALANCE_DELAY - balance delay is supported
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313 * * TREBLE - treble control is supported
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314 * * BASS - bass control is supported
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315 * * BESTFIT_PROVIDED - best fit returned
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316 * * LOAD_CODE - DSP load needed
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317 * paud.rc; * NO_PLAY - DSP code can't do play requests
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318 * * NO_RECORD - DSP code can't do record requests
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319 * * INVALID_REQUEST - request was invalid
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320 * * CONFLICT - conflict with open's flags
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321 * * OVERLOADED - out of DSP MIPS or memory
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322 * paud.position_resolution; * smallest increment for position
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323 */
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324
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325 paud_init.srate = spec->freq;
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326 paud_init.mode = PCM;
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327 paud_init.operation = PLAY;
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328 paud_init.channels = spec->channels;
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329
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330 /* Try for a closest match on audio format */
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331 format = 0;
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332 for (test_format = SDL_FirstAudioFormat(spec->format);
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333 !format && test_format;) {
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334 #ifdef DEBUG_AUDIO
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335 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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336 #endif
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337 switch (test_format) {
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338 case AUDIO_U8:
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339 bytes_per_sample = 1;
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340 paud_init.bits_per_sample = 8;
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341 paud_init.flags = TWOS_COMPLEMENT | FIXED;
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342 format = 1;
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343 break;
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344 case AUDIO_S8:
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345 bytes_per_sample = 1;
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346 paud_init.bits_per_sample = 8;
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347 paud_init.flags = SIGNED | TWOS_COMPLEMENT | FIXED;
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348 format = 1;
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349 break;
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350 case AUDIO_S16LSB:
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351 bytes_per_sample = 2;
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352 paud_init.bits_per_sample = 16;
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353 paud_init.flags = SIGNED | TWOS_COMPLEMENT | FIXED;
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354 format = 1;
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355 break;
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356 case AUDIO_S16MSB:
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357 bytes_per_sample = 2;
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358 paud_init.bits_per_sample = 16;
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359 paud_init.flags = BIG_ENDIAN | SIGNED | TWOS_COMPLEMENT | FIXED;
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360 format = 1;
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361 break;
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362 case AUDIO_U16LSB:
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363 bytes_per_sample = 2;
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364 paud_init.bits_per_sample = 16;
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365 paud_init.flags = TWOS_COMPLEMENT | FIXED;
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366 format = 1;
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367 break;
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368 case AUDIO_U16MSB:
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369 bytes_per_sample = 2;
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370 paud_init.bits_per_sample = 16;
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371 paud_init.flags = BIG_ENDIAN | TWOS_COMPLEMENT | FIXED;
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372 format = 1;
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373 break;
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374 default:
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375 break;
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376 }
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377 if (!format) {
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378 test_format = SDL_NextAudioFormat();
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379 }
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380 }
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381 if (format == 0) {
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382 #ifdef DEBUG_AUDIO
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383 fprintf(stderr, "Couldn't find any hardware audio formats\n");
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384 #endif
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385 SDL_SetError("Couldn't find any hardware audio formats");
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386 return -1;
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387 }
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388 spec->format = test_format;
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389
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390 /*
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391 * We know the buffer size and the max number of subsequent writes
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392 * that can be pending. If more than one can pend, allow the application
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393 * to do something like double buffering between our write buffer and
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parents: 1402
diff changeset
394 * the device's own buffer that we are filling with write() anyway.
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
395 *
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
396 * We calculate spec->samples like this because SDL_CalculateAudioSpec()
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
397 * will give put paud_bufinfo.write_buf_cap (or paud_bufinfo.write_buf_cap/2)
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
398 * into spec->size in return.
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
399 */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
400 if (paud_bufinfo.request_buf_cap == 1) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
401 spec->samples = paud_bufinfo.write_buf_cap
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
402 / bytes_per_sample / spec->channels;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
403 } else {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
404 spec->samples = paud_bufinfo.write_buf_cap
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
405 / bytes_per_sample / spec->channels / 2;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
406 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
407 paud_init.bsize = bytes_per_sample * spec->channels;
0
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parents:
diff changeset
408
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diff changeset
409 SDL_CalculateAudioSpec(spec);
0
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diff changeset
410
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diff changeset
411 /*
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
412 * The AIX paud device init can't modify the values of the audio_init
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
413 * structure that we pass to it. So we don't need any recalculation
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
414 * of this stuff and no reinit call as in linux dsp and dma code.
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
415 *
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
416 * /dev/paud supports all of the encoding formats, so we don't need
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
417 * to do anything like reopening the device, either.
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
418 */
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diff changeset
419 if (ioctl(audio_fd, AUDIO_INIT, &paud_init) < 0) {
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420 switch (paud_init.rc) {
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diff changeset
421 case 1:
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
422 SDL_SetError
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diff changeset
423 ("Couldn't set audio format: DSP can't do play requests");
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
424 return -1;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
425 break;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
426 case 2:
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
427 SDL_SetError
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
428 ("Couldn't set audio format: DSP can't do record requests");
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
429 return -1;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
430 break;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
431 case 4:
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432 SDL_SetError("Couldn't set audio format: request was invalid");
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diff changeset
433 return -1;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
434 break;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
435 case 5:
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
436 SDL_SetError
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
437 ("Couldn't set audio format: conflict with open's flags");
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
438 return -1;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
439 break;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
440 case 6:
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
441 SDL_SetError
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
442 ("Couldn't set audio format: out of DSP MIPS or memory");
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
443 return -1;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
444 break;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
445 default:
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
446 SDL_SetError
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
447 ("Couldn't set audio format: not documented in sys/audio.h");
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
448 return -1;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
449 break;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
450 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
451 }
0
74212992fb08 Initial revision
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parents:
diff changeset
452
1662
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diff changeset
453 /* Allocate mixing buffer */
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diff changeset
454 mixlen = spec->size;
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455 mixbuf = (Uint8 *) SDL_AllocAudioMem(mixlen);
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782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
456 if (mixbuf == NULL) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
457 return -1;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
458 }
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diff changeset
459 SDL_memset(mixbuf, spec->silence, spec->size);
0
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diff changeset
460
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diff changeset
461 /*
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
462 * Set some paramters: full volume, first speaker that we can find.
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Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
463 * Ignore the other settings for now.
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
464 */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
465 paud_change.input = AUDIO_IGNORE; /* the new input source */
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Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
466 paud_change.output = OUTPUT_1; /* EXTERNAL_SPEAKER,INTERNAL_SPEAKER,OUTPUT_1 */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
467 paud_change.monitor = AUDIO_IGNORE; /* the new monitor state */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
468 paud_change.volume = 0x7fffffff; /* volume level [0-0x7fffffff] */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
469 paud_change.volume_delay = AUDIO_IGNORE; /* the new volume delay */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
470 paud_change.balance = 0x3fffffff; /* the new balance */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
471 paud_change.balance_delay = AUDIO_IGNORE; /* the new balance delay */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
472 paud_change.treble = AUDIO_IGNORE; /* the new treble state */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
473 paud_change.bass = AUDIO_IGNORE; /* the new bass state */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
474 paud_change.pitch = AUDIO_IGNORE; /* the new pitch state */
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
475
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
476 paud_control.ioctl_request = AUDIO_CHANGE;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
477 paud_control.request_info = (char *) &paud_change;
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parents: 1662
diff changeset
478 if (ioctl(audio_fd, AUDIO_CONTROL, &paud_control) < 0) {
0
74212992fb08 Initial revision
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parents:
diff changeset
479 #ifdef DEBUG_AUDIO
1668
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parents: 1662
diff changeset
480 fprintf(stderr, "Can't change audio display settings\n");
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
481 #endif
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
482 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
483
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
484 /*
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
485 * Tell the device to expect data. Actual start will wait for
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
486 * the first write() call.
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
487 */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
488 paud_control.ioctl_request = AUDIO_START;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
489 paud_control.position = 0;
1668
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diff changeset
490 if (ioctl(audio_fd, AUDIO_CONTROL, &paud_control) < 0) {
0
74212992fb08 Initial revision
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parents:
diff changeset
491 #ifdef DEBUG_AUDIO
1668
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parents: 1662
diff changeset
492 fprintf(stderr, "Can't start audio play\n");
0
74212992fb08 Initial revision
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parents:
diff changeset
493 #endif
1668
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parents: 1662
diff changeset
494 SDL_SetError("Can't start audio play");
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1402
diff changeset
495 return -1;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
496 }
0
74212992fb08 Initial revision
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parents:
diff changeset
497
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
498 /* Check to see if we need to use select() workaround */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
499 {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
500 char *workaround;
1668
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parents: 1662
diff changeset
501 workaround = SDL_getenv("SDL_DSP_NOSELECT");
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
502 if (workaround) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
503 frame_ticks = (float) (spec->samples * 1000) / spec->freq;
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diff changeset
504 next_frame = SDL_GetTicks() + frame_ticks;
0
74212992fb08 Initial revision
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parents:
diff changeset
505 }
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
506 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
507
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
508 /* Get the parent process id (we're the parent of the audio thread) */
1668
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parents: 1662
diff changeset
509 parent = getpid();
0
74212992fb08 Initial revision
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parents:
diff changeset
510
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
511 /* We're ready to rock and roll. :-) */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
512 return 0;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
513 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
514
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
515 /* vi: set ts=4 sw=4 expandtab: */