Mercurial > sdl-ios-xcode
annotate src/audio/dma/SDL_dmaaudio.c @ 3795:589bc3d060cd SDL-ryan-multiple-audio-device
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
author | Ryan C. Gordon <icculus@icculus.org> |
---|---|
date | Wed, 04 Oct 2006 06:00:10 +0000 |
parents | 3b4ce57c6215 |
children | c8b3d3d13ed1 |
rev | line source |
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0 | 1 /* |
2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
0 | 4 |
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 |
0 | 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. |
0 | 9 |
10 This library is distributed in the hope that it will be useful, | |
11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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13 Lesser General Public License for more details. |
0 | 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 |
0 | 18 |
19 Sam Lantinga | |
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20 slouken@libsdl.org |
0 | 21 */ |
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22 #include "SDL_config.h" |
0 | 23 |
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24 /* !!! FIXME: merge this driver with "dsp". */ |
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25 |
0 | 26 /* Allow access to a raw mixing buffer */ |
27 | |
28 #include <stdio.h> | |
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29 #include <string.h> /* For strerror() */ |
0 | 30 #include <errno.h> |
31 #include <unistd.h> | |
32 #include <fcntl.h> | |
33 #include <signal.h> | |
34 #include <sys/types.h> | |
35 #include <sys/time.h> | |
36 #include <sys/ioctl.h> | |
37 #include <sys/stat.h> | |
38 #include <sys/mman.h> | |
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39 |
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40 #if SDL_AUDIO_DRIVER_OSS_SOUNDCARD_H |
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41 /* This is installed on some systems */ |
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42 #include <soundcard.h> |
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43 #else |
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44 /* This is recommended by OSS */ |
0 | 45 #include <sys/soundcard.h> |
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46 #endif |
0 | 47 |
48 #ifndef MAP_FAILED | |
49 #define MAP_FAILED ((Uint8 *)-1) | |
50 #endif | |
51 | |
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52 #include "SDL_timer.h" |
0 | 53 #include "SDL_audio.h" |
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54 #include "../SDL_audio_c.h" |
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55 #include "../SDL_audiodev_c.h" |
0 | 56 #include "SDL_dmaaudio.h" |
57 | |
58 /* The tag name used by DMA audio */ | |
59 #define DMA_DRIVER_NAME "dma" | |
60 | |
61 /* Open the audio device for playback, and don't block if busy */ | |
62 #define OPEN_FLAGS (O_RDWR|O_NONBLOCK) | |
63 | |
64 /* Audio driver functions */ | |
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65 static int DMA_DetectDevices(int iscapture); |
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66 static const char *DMA_GetDeviceName(int index, int iscapture); |
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67 static int DMA_OpenDevice(_THIS, const char *devname, int iscapture); |
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68 static void DMA_WaitDevice(_THIS); |
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69 static void DMA_PlayDevice(_THIS); |
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70 static Uint8 *DMA_GetDeviceBuf(_THIS); |
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71 static void DMA_CloseDevice(_THIS); |
0 | 72 |
73 /* Audio driver bootstrap functions */ | |
74 | |
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75 static int |
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76 DMA_Available(void) |
0 | 77 { |
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78 /* |
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79 * !!! FIXME: maybe change this to always available, and move this to |
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80 * !!! FIXME: to device enumeration and opening? |
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81 */ |
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82 int available; |
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83 int fd; |
0 | 84 |
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85 available = 0; |
0 | 86 |
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87 fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0); |
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88 if (fd >= 0) { |
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89 int caps; |
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90 struct audio_buf_info info; |
0 | 91 |
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92 if ((ioctl(fd, SNDCTL_DSP_GETCAPS, &caps) == 0) && |
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93 (caps & DSP_CAP_TRIGGER) && (caps & DSP_CAP_MMAP) && |
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94 (ioctl(fd, SNDCTL_DSP_GETOSPACE, &info) == 0)) { |
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95 available = 1; |
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96 } |
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97 close(fd); |
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98 } |
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99 return (available); |
0 | 100 } |
101 | |
102 | |
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103 static int |
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104 DMA_Init(SDL_AudioDriverImpl *impl) |
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105 { |
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106 /* Set the function pointers */ |
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107 impl->DetectDevices = DMA_DetectDevices; |
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108 impl->GetDeviceName = DMA_GetDeviceName; |
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109 impl->OpenDevice = DMA_OpenDevice; |
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110 impl->WaitDevice = DMA_WaitDevice; |
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111 impl->PlayDevice = DMA_PlayDevice; |
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112 impl->GetDeviceBuf = DMA_GetDeviceBuf; |
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113 impl->CloseDevice = DMA_CloseDevice; |
0 | 114 |
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115 return 1; |
0 | 116 } |
117 | |
118 AudioBootStrap DMA_bootstrap = { | |
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119 DMA_DRIVER_NAME, "OSS /dev/dsp DMA audio", |
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120 DMA_Available, DMA_Init |
0 | 121 }; |
122 | |
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123 |
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124 static int |
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125 DMA_DetectDevices(int iscapture) |
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126 { |
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127 return -1; /* !!! FIXME */ |
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128 } |
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129 |
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130 |
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131 static const char * |
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132 DMA_GetDeviceName(int index, int iscapture) |
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133 { |
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134 SDL_SetError("No such device"); /* !!! FIXME */ |
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135 return NULL; |
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136 } |
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137 |
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138 |
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139 static int |
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140 DMA_ReopenAudio(_THIS, const char *audiodev, int format, int stereo) |
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141 { |
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142 int frag_spec; |
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143 int value; |
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144 |
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145 /* Close and then reopen the audio device */ |
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146 close(audio_fd); |
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147 audio_fd = open(audiodev, O_RDWR, 0); |
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148 if (audio_fd < 0) { |
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149 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno)); |
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150 return (-1); |
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151 } |
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152 |
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153 /* Calculate the final parameters for this audio specification */ |
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154 SDL_CalculateAudioSpec(&this->spec); |
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155 |
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156 /* Determine the power of two of the fragment size */ |
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157 for (frag_spec = 0; (0x01 << frag_spec) < this->spec.size; ++frag_spec); |
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158 if ((0x01 << frag_spec) != this->spec.size) { |
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159 SDL_SetError("Fragment size must be a power of two"); |
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160 return (-1); |
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161 } |
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162 |
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163 /* Set the audio buffering parameters */ |
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164 if (ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0) { |
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165 SDL_SetError("Couldn't set audio fragment spec"); |
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166 return (-1); |
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167 } |
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168 |
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169 /* Set the audio format */ |
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170 value = format; |
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171 if ((ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) || (value != format)) { |
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172 SDL_SetError("Couldn't set audio format"); |
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173 return (-1); |
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174 } |
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175 |
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176 /* Set mono or stereo audio */ |
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177 value = (this->spec.channels > 1); |
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178 if ((ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo) < 0) || |
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179 (value != stereo)) { |
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180 SDL_SetError("Couldn't set audio channels"); |
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181 return (-1); |
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182 } |
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183 |
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184 /* Set the DSP frequency */ |
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185 value = this->spec.freq; |
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186 if (ioctl(audio_fd, SNDCTL_DSP_SPEED, &value) < 0) { |
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187 SDL_SetError("Couldn't set audio frequency"); |
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188 return (-1); |
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189 } |
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190 this->spec.freq = value; |
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191 |
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192 /* We successfully re-opened the audio */ |
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193 return (0); |
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194 } |
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195 |
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196 |
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197 |
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198 static int |
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199 open_device_internal(_THIS, const char *devname, int iscapture) |
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200 { |
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201 char audiodev[1024]; |
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202 int format; |
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203 int stereo; |
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204 int value; |
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205 SDL_AudioFormat test_format; |
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206 struct audio_buf_info info; |
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207 |
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208 /* Initialize all variables that we clean on shutdown */ |
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209 this->hidden = (struct SDL_PrivateAudioData *) |
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210 SDL_malloc((sizeof *this->hidden)); |
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211 if (this->hidden == NULL) { |
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212 SDL_OutOfMemory(); |
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213 return 0; |
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214 } |
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215 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
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216 |
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217 /* !!! FIXME: handle devname */ |
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218 /* !!! FIXME: handle iscapture */ |
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219 |
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220 /* Open the audio device */ |
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221 audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0); |
589bc3d060cd
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222 if (audio_fd < 0) { |
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223 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno)); |
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224 return 0; |
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225 } |
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226 dma_buf = NULL; |
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227 ioctl(audio_fd, SNDCTL_DSP_RESET, 0); |
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228 |
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229 /* Get a list of supported hardware formats */ |
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230 if (ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0) { |
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231 SDL_SetError("Couldn't get audio format list"); |
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232 return 0; |
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233 } |
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234 |
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235 /* Try for a closest match on audio format */ |
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236 format = 0; |
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237 for (test_format = SDL_FirstAudioFormat(this->spec.format); |
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238 !format && test_format;) { |
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239 #ifdef DEBUG_AUDIO |
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240 fprintf(stderr, "Trying format 0x%4.4x\n", test_format); |
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241 #endif |
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242 switch (test_format) { |
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243 case AUDIO_U8: |
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244 if (value & AFMT_U8) { |
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245 format = AFMT_U8; |
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246 } |
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247 break; |
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248 case AUDIO_S8: |
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249 if (value & AFMT_S8) { |
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250 format = AFMT_S8; |
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251 } |
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252 break; |
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253 case AUDIO_S16LSB: |
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254 if (value & AFMT_S16_LE) { |
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255 format = AFMT_S16_LE; |
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256 } |
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|
257 break; |
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258 case AUDIO_S16MSB: |
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259 if (value & AFMT_S16_BE) { |
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|
260 format = AFMT_S16_BE; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
261 } |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
262 break; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
263 case AUDIO_U16LSB: |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
264 if (value & AFMT_U16_LE) { |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
265 format = AFMT_U16_LE; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
266 } |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
267 break; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
268 case AUDIO_U16MSB: |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
269 if (value & AFMT_U16_BE) { |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
270 format = AFMT_U16_BE; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
271 } |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
272 break; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
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changeset
|
273 default: |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
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changeset
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274 format = 0; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
275 break; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
276 } |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
277 if (!format) { |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
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changeset
|
278 test_format = SDL_NextAudioFormat(); |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
279 } |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
280 } |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
281 if (format == 0) { |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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changeset
|
282 SDL_SetError("Couldn't find any hardware audio formats"); |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
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changeset
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283 return 0; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
284 } |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
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changeset
|
285 this->spec.format = test_format; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
286 |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
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changeset
|
287 /* Set the audio format */ |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
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changeset
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288 value = format; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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diff
changeset
|
289 if ((ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) || (value != format)) { |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
290 SDL_SetError("Couldn't set audio format"); |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
291 return 0; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
292 } |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
293 |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
294 /* Set mono or stereo audio (currently only two channels supported) */ |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
295 stereo = (this->spec.channels > 1); |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
296 ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo); |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
297 if (stereo) { |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
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changeset
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298 this->spec.channels = 2; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
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changeset
|
299 } else { |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
300 this->spec.channels = 1; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
301 } |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
302 |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
303 /* Because some drivers don't allow setting the buffer size |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
304 after setting the format, we must re-open the audio device |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
305 once we know what format and channels are supported |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
306 */ |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
307 if (DMA_ReopenAudio(this, audiodev, format, stereo) < 0) { |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
308 /* Error is set by DMA_ReopenAudio() */ |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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parents:
1982
diff
changeset
|
309 return 0; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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parents:
1982
diff
changeset
|
310 } |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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parents:
1982
diff
changeset
|
311 |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
312 /* Memory map the audio buffer */ |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
313 if (ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info) < 0) { |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
314 SDL_SetError("Couldn't get OSPACE parameters"); |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
315 return 0; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
316 } |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
317 this->spec.size = info.fragsize; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
318 this->spec.samples = this->spec.size / ((this->spec.format & 0xFF) / 8); |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
319 this->spec.samples /= this->spec.channels; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
320 num_buffers = info.fragstotal; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
321 dma_len = num_buffers * this->spec.size; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
322 dma_buf = (Uint8 *) mmap(NULL, dma_len, PROT_WRITE, MAP_SHARED, |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
323 audio_fd, 0); |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
324 if (dma_buf == MAP_FAILED) { |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
325 SDL_SetError("DMA memory map failed"); |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
326 dma_buf = NULL; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
327 return 0; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
328 } |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
329 SDL_memset(dma_buf, this->spec.silence, dma_len); |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
330 |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
331 /* Check to see if we need to use select() workaround */ |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
332 { |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
333 char *workaround; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
334 workaround = SDL_getenv("SDL_DSP_NOSELECT"); |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
335 if (workaround) { |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
336 frame_ticks = (float) (this->spec.samples*1000) / this->spec.freq; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
337 next_frame = SDL_GetTicks() + frame_ticks; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
338 } |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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parents:
1982
diff
changeset
|
339 } |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
340 |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
341 /* Trigger audio playback */ |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
342 value = 0; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
343 ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &value); |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
344 value = PCM_ENABLE_OUTPUT; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
345 if (ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &value) < 0) { |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
346 SDL_SetError("Couldn't trigger audio output"); |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
347 return 0; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
348 } |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
349 |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
350 /* Get the parent process id (we're the parent of the audio thread) */ |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
351 parent = getpid(); |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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parents:
1982
diff
changeset
|
352 |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
353 /* We're ready to rock and roll. :-) */ |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
354 return 1; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
355 } |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
356 |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
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1982
diff
changeset
|
357 static int |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
358 DMA_OpenDevice(_THIS, const char *devname, int iscapture) |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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parents:
1982
diff
changeset
|
359 { |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
360 int retval = open_device_internal(this, devname, iscapture); |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
361 if (!retval) |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
362 DMA_CloseDevice(this); /* !!! FIXME: do this at higher level. */ |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
363 return retval; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
364 } |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
365 |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
366 |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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367 |
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368 |
0 | 369 /* This function waits until it is possible to write a full sound buffer */ |
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370 static void |
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371 DMA_WaitDevice(_THIS) |
0 | 372 { |
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373 fd_set fdset; |
0 | 374 |
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375 /* Check to see if the thread-parent process is still alive */ |
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376 { |
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377 static int cnt = 0; |
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378 /* Note that this only works with thread implementations |
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379 that use a different process id for each thread. |
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380 */ |
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381 if (parent && (((++cnt) % 10) == 0)) { /* Check every 10 loops */ |
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382 if (kill(parent, 0) < 0) { |
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383 this->enabled = 0; |
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384 } |
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385 } |
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386 } |
0 | 387 |
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388 /* See if we need to use timed audio synchronization */ |
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389 if (frame_ticks) { |
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390 /* Use timer for general audio synchronization */ |
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391 Sint32 ticks; |
0 | 392 |
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393 ticks = ((Sint32) (next_frame - SDL_GetTicks())) - FUDGE_TICKS; |
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394 if (ticks > 0) { |
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395 SDL_Delay(ticks); |
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396 } |
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397 } else { |
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398 /* Use select() for audio synchronization */ |
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399 struct timeval timeout; |
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400 FD_ZERO(&fdset); |
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401 FD_SET(audio_fd, &fdset); |
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402 timeout.tv_sec = 10; |
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403 timeout.tv_usec = 0; |
0 | 404 #ifdef DEBUG_AUDIO |
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405 fprintf(stderr, "Waiting for audio to get ready\n"); |
0 | 406 #endif |
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407 if (select(audio_fd + 1, NULL, &fdset, NULL, &timeout) <= 0) { |
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408 const char *message = |
0 | 409 #ifdef AUDIO_OSPACE_HACK |
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410 "Audio timeout - buggy audio driver? (trying ospace)"; |
0 | 411 #else |
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412 "Audio timeout - buggy audio driver? (disabled)"; |
0 | 413 #endif |
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414 /* In general we should never print to the screen, |
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415 but in this case we have no other way of letting |
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416 the user know what happened. |
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417 */ |
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418 fprintf(stderr, "SDL: %s\n", message); |
0 | 419 #ifdef AUDIO_OSPACE_HACK |
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420 /* We may be able to use GET_OSPACE trick */ |
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421 frame_ticks = (float) (this->spec.samples * 1000) / |
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422 this->spec.freq; |
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423 next_frame = SDL_GetTicks() + frame_ticks; |
0 | 424 #else |
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425 this->enabled = 0; |
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426 /* Don't try to close - may hang */ |
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427 audio_fd = -1; |
0 | 428 #ifdef DEBUG_AUDIO |
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429 fprintf(stderr, "Done disabling audio\n"); |
0 | 430 #endif |
431 #endif /* AUDIO_OSPACE_HACK */ | |
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432 } |
0 | 433 #ifdef DEBUG_AUDIO |
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434 fprintf(stderr, "Ready!\n"); |
0 | 435 #endif |
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436 } |
0 | 437 } |
438 | |
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439 static void |
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440 DMA_PlayDevice(_THIS) |
0 | 441 { |
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442 /* If timer synchronization is enabled, set the next write frame */ |
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443 if (frame_ticks) { |
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444 next_frame += frame_ticks; |
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445 } |
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446 return; |
0 | 447 } |
448 | |
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449 static Uint8 * |
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450 DMA_GetDeviceBuf(_THIS) |
0 | 451 { |
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452 count_info info; |
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453 int playing; |
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454 int filling; |
0 | 455 |
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456 /* Get number of blocks, looping if we're not using select() */ |
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457 do { |
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458 if (ioctl(audio_fd, SNDCTL_DSP_GETOPTR, &info) < 0) { |
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459 /* Uh oh... */ |
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460 this->enabled = 0; |
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461 return (NULL); |
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462 } |
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463 } |
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464 while (frame_ticks && (info.blocks < 1)); |
0 | 465 #ifdef DEBUG_AUDIO |
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466 if (info.blocks > 1) { |
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467 printf("Warning: audio underflow (%d frags)\n", info.blocks - 1); |
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468 } |
0 | 469 #endif |
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470 playing = info.ptr / this->spec.size; |
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471 filling = (playing + 1) % num_buffers; |
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472 return (dma_buf + (filling * this->spec.size)); |
0 | 473 } |
474 | |
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475 static void |
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|
476 DMA_CloseDevice(_THIS) |
0 | 477 { |
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|
478 if (this->hidden != NULL) { |
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479 if (dma_buf != NULL) { |
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|
480 munmap(dma_buf, dma_len); |
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|
481 dma_buf = NULL; |
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482 } |
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|
483 if (audio_fd >= 0) { |
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|
484 close(audio_fd); |
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|
485 audio_fd = -1; |
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486 } |
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487 SDL_free(this->hidden); |
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|
488 this->hidden = NULL; |
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489 } |
0 | 490 } |
491 | |
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492 /* vi: set ts=4 sw=4 expandtab: */ |