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annotate src/audio/dma/SDL_dmaaudio.c @ 1668:4da1ee79c9af SDL-1.3

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more tweaking indent options
author Sam Lantinga <slouken@libsdl.org>
date Mon, 29 May 2006 04:04:35 +0000
parents 782fd950bd46
children
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* Allow access to a raw mixing buffer */
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25
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26 #include <stdio.h>
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27 #include <string.h> /* For strerror() */
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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 <signal.h>
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32 #include <sys/types.h>
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33 #include <sys/time.h>
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34 #include <sys/ioctl.h>
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35 #include <sys/stat.h>
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36 #include <sys/mman.h>
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37
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38 #if SDL_AUDIO_DRIVER_OSS_SOUNDCARD_H
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39 /* This is installed on some systems */
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40 #include <soundcard.h>
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41 #else
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42 /* This is recommended by OSS */
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43 #include <sys/soundcard.h>
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44 #endif
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45
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46 #ifndef MAP_FAILED
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47 #define MAP_FAILED ((Uint8 *)-1)
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48 #endif
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49
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50 #include "SDL_timer.h"
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51 #include "SDL_audio.h"
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52 #include "../SDL_audio_c.h"
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53 #include "../SDL_audiodev_c.h"
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54 #include "SDL_dmaaudio.h"
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55
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56 /* The tag name used by DMA audio */
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57 #define DMA_DRIVER_NAME "dma"
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58
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59 /* Open the audio device for playback, and don't block if busy */
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60 #define OPEN_FLAGS (O_RDWR|O_NONBLOCK)
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61
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62 /* Audio driver functions */
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63 static int DMA_OpenAudio(_THIS, SDL_AudioSpec * spec);
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64 static void DMA_WaitAudio(_THIS);
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65 static void DMA_PlayAudio(_THIS);
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66 static Uint8 *DMA_GetAudioBuf(_THIS);
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67 static void DMA_CloseAudio(_THIS);
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68
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69 /* Audio driver bootstrap functions */
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70
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71 static int
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72 Audio_Available(void)
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73 {
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74 int available;
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75 int fd;
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76
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77 available = 0;
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78
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79 fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0);
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80 if (fd >= 0) {
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81 int caps;
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82 struct audio_buf_info info;
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83
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84 if ((ioctl(fd, SNDCTL_DSP_GETCAPS, &caps) == 0) &&
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85 (caps & DSP_CAP_TRIGGER) && (caps & DSP_CAP_MMAP) &&
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86 (ioctl(fd, SNDCTL_DSP_GETOSPACE, &info) == 0)) {
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87 available = 1;
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88 }
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89 close(fd);
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90 }
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91 return (available);
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92 }
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93
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94 static void
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95 Audio_DeleteDevice(SDL_AudioDevice * device)
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96 {
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97 SDL_free(device->hidden);
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98 SDL_free(device);
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99 }
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100
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101 static SDL_AudioDevice *
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102 Audio_CreateDevice(int devindex)
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103 {
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104 SDL_AudioDevice *this;
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105
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106 /* Initialize all variables that we clean on shutdown */
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107 this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
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108 if (this) {
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109 SDL_memset(this, 0, (sizeof *this));
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110 this->hidden = (struct SDL_PrivateAudioData *)
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111 SDL_malloc((sizeof *this->hidden));
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112 }
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113 if ((this == NULL) || (this->hidden == NULL)) {
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114 SDL_OutOfMemory();
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115 if (this) {
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116 SDL_free(this);
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117 }
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118 return (0);
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119 }
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120 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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121 audio_fd = -1;
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122
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123 /* Set the function pointers */
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124 this->OpenAudio = DMA_OpenAudio;
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125 this->WaitAudio = DMA_WaitAudio;
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126 this->PlayAudio = DMA_PlayAudio;
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127 this->GetAudioBuf = DMA_GetAudioBuf;
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128 this->CloseAudio = DMA_CloseAudio;
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129
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130 this->free = Audio_DeleteDevice;
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131
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132 return this;
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133 }
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134
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135 AudioBootStrap DMA_bootstrap = {
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136 DMA_DRIVER_NAME, "OSS /dev/dsp DMA audio",
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137 Audio_Available, Audio_CreateDevice
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138 };
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139
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140 /* This function waits until it is possible to write a full sound buffer */
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141 static void
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142 DMA_WaitAudio(_THIS)
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143 {
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144 fd_set fdset;
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145
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146 /* Check to see if the thread-parent process is still alive */
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147 {
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148 static int cnt = 0;
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149 /* Note that this only works with thread implementations
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150 that use a different process id for each thread.
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151 */
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152 if (parent && (((++cnt) % 10) == 0)) { /* Check every 10 loops */
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153 if (kill(parent, 0) < 0) {
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154 this->enabled = 0;
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155 }
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156 }
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157 }
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158
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159 /* See if we need to use timed audio synchronization */
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160 if (frame_ticks) {
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161 /* Use timer for general audio synchronization */
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162 Sint32 ticks;
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163
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164 ticks = ((Sint32) (next_frame - SDL_GetTicks())) - FUDGE_TICKS;
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165 if (ticks > 0) {
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166 SDL_Delay(ticks);
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167 }
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168 } else {
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169 /* Use select() for audio synchronization */
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170 struct timeval timeout;
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171 FD_ZERO(&fdset);
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172 FD_SET(audio_fd, &fdset);
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173 timeout.tv_sec = 10;
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174 timeout.tv_usec = 0;
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175 #ifdef DEBUG_AUDIO
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176 fprintf(stderr, "Waiting for audio to get ready\n");
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177 #endif
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178 if (select(audio_fd + 1, NULL, &fdset, NULL, &timeout) <= 0) {
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179 const char *message =
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180 #ifdef AUDIO_OSPACE_HACK
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181 "Audio timeout - buggy audio driver? (trying ospace)";
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182 #else
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183 "Audio timeout - buggy audio driver? (disabled)";
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184 #endif
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185 /* In general we should never print to the screen,
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186 but in this case we have no other way of letting
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187 the user know what happened.
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188 */
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189 fprintf(stderr, "SDL: %s\n", message);
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190 #ifdef AUDIO_OSPACE_HACK
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191 /* We may be able to use GET_OSPACE trick */
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192 frame_ticks = (float) (this->spec->samples * 1000) /
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193 this->spec->freq;
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194 next_frame = SDL_GetTicks() + frame_ticks;
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195 #else
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196 this->enabled = 0;
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197 /* Don't try to close - may hang */
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198 audio_fd = -1;
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199 #ifdef DEBUG_AUDIO
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200 fprintf(stderr, "Done disabling audio\n");
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201 #endif
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202 #endif /* AUDIO_OSPACE_HACK */
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203 }
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204 #ifdef DEBUG_AUDIO
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205 fprintf(stderr, "Ready!\n");
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206 #endif
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207 }
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208 }
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209
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210 static void
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211 DMA_PlayAudio(_THIS)
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212 {
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213 /* If timer synchronization is enabled, set the next write frame */
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214 if (frame_ticks) {
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215 next_frame += frame_ticks;
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216 }
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217 return;
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218 }
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219
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220 static Uint8 *
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221 DMA_GetAudioBuf(_THIS)
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222 {
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223 count_info info;
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224 int playing;
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225 int filling;
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226
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227 /* Get number of blocks, looping if we're not using select() */
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228 do {
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229 if (ioctl(audio_fd, SNDCTL_DSP_GETOPTR, &info) < 0) {
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230 /* Uh oh... */
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231 this->enabled = 0;
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232 return (NULL);
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233 }
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234 }
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235 while (frame_ticks && (info.blocks < 1));
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236 #ifdef DEBUG_AUDIO
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237 if (info.blocks > 1) {
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238 printf("Warning: audio underflow (%d frags)\n", info.blocks - 1);
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239 }
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240 #endif
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241 playing = info.ptr / this->spec.size;
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242 filling = (playing + 1) % num_buffers;
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243 return (dma_buf + (filling * this->spec.size));
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244 }
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245
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246 static void
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247 DMA_CloseAudio(_THIS)
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248 {
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249 if (dma_buf != NULL) {
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250 munmap(dma_buf, dma_len);
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251 dma_buf = NULL;
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252 }
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253 if (audio_fd >= 0) {
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254 close(audio_fd);
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255 audio_fd = -1;
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256 }
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257 }
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258
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259 static int
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260 DMA_ReopenAudio(_THIS, const char *audiodev, int format, int stereo,
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261 SDL_AudioSpec * spec)
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262 {
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263 int frag_spec;
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264 int value;
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265
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266 /* Close and then reopen the audio device */
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267 close(audio_fd);
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268 audio_fd = open(audiodev, O_RDWR, 0);
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269 if (audio_fd < 0) {
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270 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
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271 return (-1);
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272 }
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273
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274 /* Calculate the final parameters for this audio specification */
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275 SDL_CalculateAudioSpec(spec);
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276
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277 /* Determine the power of two of the fragment size */
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278 for (frag_spec = 0; (0x01 << frag_spec) < spec->size; ++frag_spec);
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279 if ((0x01 << frag_spec) != spec->size) {
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280 SDL_SetError("Fragment size must be a power of two");
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281 return (-1);
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282 }
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283
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284 /* Set the audio buffering parameters */
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285 if (ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0) {
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286 SDL_SetError("Couldn't set audio fragment spec");
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287 return (-1);
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288 }
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289
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290 /* Set the audio format */
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291 value = format;
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292 if ((ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) || (value != format)) {
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293 SDL_SetError("Couldn't set audio format");
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294 return (-1);
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295 }
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296
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297 /* Set mono or stereo audio */
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298 value = (spec->channels > 1);
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299 if ((ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo) < 0) ||
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300 (value != stereo)) {
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301 SDL_SetError("Couldn't set audio channels");
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302 return (-1);
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303 }
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304
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305 /* Set the DSP frequency */
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306 value = spec->freq;
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307 if (ioctl(audio_fd, SNDCTL_DSP_SPEED, &value) < 0) {
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308 SDL_SetError("Couldn't set audio frequency");
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309 return (-1);
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310 }
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311 spec->freq = value;
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312
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313 /* We successfully re-opened the audio */
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314 return (0);
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315 }
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316
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317 static int
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318 DMA_OpenAudio(_THIS, SDL_AudioSpec * spec)
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319 {
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320 char audiodev[1024];
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321 int format;
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322 int stereo;
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323 int value;
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324 Uint16 test_format;
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325 struct audio_buf_info info;
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326
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327 /* Reset the timer synchronization flag */
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328 frame_ticks = 0.0;
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329
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330 /* Open the audio device */
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331 audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0);
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332 if (audio_fd < 0) {
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333 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
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334 return (-1);
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335 }
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336 dma_buf = NULL;
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337 ioctl(audio_fd, SNDCTL_DSP_RESET, 0);
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338
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339 /* Get a list of supported hardware formats */
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340 if (ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0) {
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341 SDL_SetError("Couldn't get audio format list");
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342 return (-1);
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343 }
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344
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345 /* Try for a closest match on audio format */
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346 format = 0;
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347 for (test_format = SDL_FirstAudioFormat(spec->format);
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348 !format && test_format;) {
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diff changeset
349 #ifdef DEBUG_AUDIO
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350 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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351 #endif
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352 switch (test_format) {
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353 case AUDIO_U8:
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354 if (value & AFMT_U8) {
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355 format = AFMT_U8;
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diff changeset
356 }
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diff changeset
357 break;
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diff changeset
358 case AUDIO_S8:
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359 if (value & AFMT_S8) {
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diff changeset
360 format = AFMT_S8;
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diff changeset
361 }
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diff changeset
362 break;
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diff changeset
363 case AUDIO_S16LSB:
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diff changeset
364 if (value & AFMT_S16_LE) {
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365 format = AFMT_S16_LE;
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366 }
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
367 break;
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diff changeset
368 case AUDIO_S16MSB:
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diff changeset
369 if (value & AFMT_S16_BE) {
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370 format = AFMT_S16_BE;
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diff changeset
371 }
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diff changeset
372 break;
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diff changeset
373 case AUDIO_U16LSB:
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diff changeset
374 if (value & AFMT_U16_LE) {
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diff changeset
375 format = AFMT_U16_LE;
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
376 }
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
377 break;
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diff changeset
378 case AUDIO_U16MSB:
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diff changeset
379 if (value & AFMT_U16_BE) {
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diff changeset
380 format = AFMT_U16_BE;
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diff changeset
381 }
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diff changeset
382 break;
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diff changeset
383 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
384 format = 0;
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
385 break;
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diff changeset
386 }
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diff changeset
387 if (!format) {
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388 test_format = SDL_NextAudioFormat();
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diff changeset
389 }
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diff changeset
390 }
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
391 if (format == 0) {
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392 SDL_SetError("Couldn't find any hardware audio formats");
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393 return (-1);
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394 }
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395 spec->format = test_format;
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396
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397 /* Set the audio format */
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398 value = format;
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399 if ((ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) || (value != format)) {
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400 SDL_SetError("Couldn't set audio format");
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401 return (-1);
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402 }
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403
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404 /* Set mono or stereo audio (currently only two channels supported) */
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405 stereo = (spec->channels > 1);
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406 ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo);
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407 if (stereo) {
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408 spec->channels = 2;
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409 } else {
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410 spec->channels = 1;
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411 }
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412
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413 /* Because some drivers don't allow setting the buffer size
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414 after setting the format, we must re-open the audio device
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415 once we know what format and channels are supported
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416 */
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417 if (DMA_ReopenAudio(this, audiodev, format, stereo, spec) < 0) {
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418 /* Error is set by DMA_ReopenAudio() */
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419 return (-1);
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420 }
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421
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422 /* Memory map the audio buffer */
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423 if (ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info) < 0) {
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424 SDL_SetError("Couldn't get OSPACE parameters");
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425 return (-1);
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426 }
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427 spec->size = info.fragsize;
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428 spec->samples = spec->size / ((spec->format & 0xFF) / 8);
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429 spec->samples /= spec->channels;
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430 num_buffers = info.fragstotal;
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431 dma_len = num_buffers * spec->size;
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432 dma_buf = (Uint8 *) mmap(NULL, dma_len, PROT_WRITE, MAP_SHARED,
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433 audio_fd, 0);
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434 if (dma_buf == MAP_FAILED) {
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435 SDL_SetError("DMA memory map failed");
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436 dma_buf = NULL;
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437 return (-1);
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438 }
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439 SDL_memset(dma_buf, spec->silence, dma_len);
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440
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441 /* Check to see if we need to use select() workaround */
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442 {
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443 char *workaround;
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444 workaround = SDL_getenv("SDL_DSP_NOSELECT");
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445 if (workaround) {
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446 frame_ticks = (float) (spec->samples * 1000) / spec->freq;
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447 next_frame = SDL_GetTicks() + frame_ticks;
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448 }
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449 }
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450
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451 /* Trigger audio playback */
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452 value = 0;
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453 ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &value);
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454 value = PCM_ENABLE_OUTPUT;
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455 if (ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &value) < 0) {
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456 SDL_SetError("Couldn't trigger audio output");
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457 return (-1);
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458 }
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diff changeset
459
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diff changeset
460 /* Get the parent process id (we're the parent of the audio thread) */
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461 parent = getpid();
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462
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diff changeset
463 /* We're ready to rock and roll. :-) */
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464 return (0);
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465 }
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diff changeset
466
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467 /* vi: set ts=4 sw=4 expandtab: */