Mercurial > sdl-ios-xcode
annotate src/audio/dma/SDL_dmaaudio.c @ 2690:ca01c20274c0 gsoc2008_nds
More work and some bugfixes on the graphics driver.
| author | Darren Alton <dalton@stevens.edu> |
|---|---|
| date | Sat, 16 Aug 2008 07:44:35 +0000 |
| parents | e27bdcc80744 |
| children | 99210400e8b9 |
| rev | line source |
|---|---|
| 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 */ | |
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62 #define OPEN_FLAGS_INPUT (O_RDWR|O_NONBLOCK) |
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63 #define OPEN_FLAGS_OUTPUT (O_RDWR|O_NONBLOCK) |
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64 |
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65 static char **outputDevices = NULL; |
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66 static int outputDeviceCount = 0; |
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67 static char **inputDevices = NULL; |
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68 static int inputDeviceCount = 0; |
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69 |
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70 static int |
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71 test_for_mmap(int fd) |
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72 { |
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73 int caps = 0; |
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74 struct audio_buf_info info; |
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75 if ((ioctl(fd, SNDCTL_DSP_GETCAPS, &caps) == 0) && |
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76 (caps & DSP_CAP_TRIGGER) && (caps & DSP_CAP_MMAP) && |
| 2060 | 77 (ioctl(fd, SNDCTL_DSP_GETOSPACE, &info) == 0)) { |
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78 size_t len = info.fragstotal * info.fragsize; |
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79 Uint8 *buf = (Uint8 *) mmap(NULL, len, PROT_WRITE, MAP_SHARED, fd, 0); |
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80 if (buf != MAP_FAILED) { |
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81 munmap(buf, len); |
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82 return 1; |
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83 } |
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84 } |
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85 return 0; |
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86 } |
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87 |
| 0 | 88 |
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89 static inline void |
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90 free_device_list(char ***devs, int *count) |
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91 { |
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92 SDL_FreeUnixAudioDevices(devs, count); |
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93 } |
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94 |
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95 static inline void |
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96 build_device_list(int iscapture, char ***devs, int *count) |
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97 { |
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98 const int flags = ((iscapture) ? OPEN_FLAGS_INPUT : OPEN_FLAGS_OUTPUT); |
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99 free_device_list(devs, count); |
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100 SDL_EnumUnixAudioDevices(flags, 0, test_for_mmap, devs, count); |
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101 } |
| 0 | 102 |
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103 static inline void |
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104 build_device_lists(void) |
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105 { |
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106 build_device_list(0, &outputDevices, &outputDeviceCount); |
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107 build_device_list(1, &inputDevices, &inputDeviceCount); |
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108 } |
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109 |
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110 |
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111 static inline void |
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112 free_device_lists(void) |
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113 { |
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114 free_device_list(&outputDevices, &outputDeviceCount); |
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115 free_device_list(&inputDevices, &inputDeviceCount); |
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116 } |
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117 |
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118 |
| 2060 | 119 static void |
| 120 DMA_Deinitialize(void) | |
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121 { |
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122 free_device_lists(); |
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123 } |
| 0 | 124 |
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125 static int |
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126 DMA_DetectDevices(int iscapture) |
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127 { |
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128 if (iscapture) { |
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129 build_device_list(1, &inputDevices, &inputDeviceCount); |
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130 return inputDeviceCount; |
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131 } else { |
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132 build_device_list(0, &outputDevices, &outputDeviceCount); |
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133 return outputDeviceCount; |
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134 } |
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135 |
| 2060 | 136 return 0; /* shouldn't ever hit this. */ |
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137 } |
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138 |
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139 |
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140 static const char * |
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141 DMA_GetDeviceName(int index, int iscapture) |
| 0 | 142 { |
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143 if ((iscapture) && (index < inputDeviceCount)) { |
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144 return inputDevices[index]; |
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145 } else if ((!iscapture) && (index < outputDeviceCount)) { |
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146 return outputDevices[index]; |
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147 } |
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148 |
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149 SDL_SetError("No such device"); |
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150 return NULL; |
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151 } |
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152 |
| 0 | 153 |
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154 static int |
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155 DMA_ReopenAudio(_THIS, const char *audiodev, int format, int stereo) |
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156 { |
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157 int frag_spec; |
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158 int value; |
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159 |
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160 /* Close and then reopen the audio device */ |
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161 close(audio_fd); |
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162 audio_fd = open(audiodev, O_RDWR, 0); |
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163 if (audio_fd < 0) { |
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164 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno)); |
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165 return (-1); |
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166 } |
| 0 | 167 |
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168 /* Calculate the final parameters for this audio specification */ |
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169 SDL_CalculateAudioSpec(&this->spec); |
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170 |
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171 /* Determine the power of two of the fragment size */ |
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172 for (frag_spec = 0; (0x01 << frag_spec) < this->spec.size; ++frag_spec); |
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173 if ((0x01 << frag_spec) != this->spec.size) { |
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174 SDL_SetError("Fragment size must be a power of two"); |
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175 return (-1); |
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176 } |
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177 |
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178 /* Set the audio buffering parameters */ |
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179 if (ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0) { |
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180 SDL_SetError("Couldn't set audio fragment spec"); |
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181 return (-1); |
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182 } |
| 0 | 183 |
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184 /* Set the audio format */ |
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185 value = format; |
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186 if ((ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) || (value != format)) { |
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187 SDL_SetError("Couldn't set audio format"); |
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188 return (-1); |
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189 } |
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190 |
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191 /* Set mono or stereo audio */ |
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192 value = (this->spec.channels > 1); |
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193 if ((ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo) < 0) || |
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194 (value != stereo)) { |
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195 SDL_SetError("Couldn't set audio channels"); |
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196 return (-1); |
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197 } |
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198 |
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199 /* Set the DSP frequency */ |
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200 value = this->spec.freq; |
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201 if (ioctl(audio_fd, SNDCTL_DSP_SPEED, &value) < 0) { |
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202 SDL_SetError("Couldn't set audio frequency"); |
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203 return (-1); |
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204 } |
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205 this->spec.freq = value; |
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206 |
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207 /* We successfully re-opened the audio */ |
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208 return (0); |
| 0 | 209 } |
| 210 | |
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211 |
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212 static void |
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213 DMA_CloseDevice(_THIS) |
| 0 | 214 { |
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215 if (this->hidden != NULL) { |
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216 if (dma_buf != NULL) { |
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217 munmap(dma_buf, dma_len); |
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218 dma_buf = NULL; |
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219 } |
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220 if (audio_fd >= 0) { |
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221 close(audio_fd); |
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222 audio_fd = -1; |
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223 } |
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224 SDL_free(this->hidden); |
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225 this->hidden = NULL; |
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226 } |
| 0 | 227 } |
| 228 | |
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229 |
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230 static int |
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231 DMA_OpenDevice(_THIS, const char *devname, int iscapture) |
| 0 | 232 { |
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233 const int flags = ((iscapture) ? OPEN_FLAGS_INPUT : OPEN_FLAGS_OUTPUT); |
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234 int format; |
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235 int stereo; |
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236 int value; |
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237 SDL_AudioFormat test_format; |
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238 struct audio_buf_info info; |
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239 |
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240 /* We don't care what the devname is...we'll try to open anything. */ |
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241 /* ...but default to first name in the list... */ |
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242 if (devname == NULL) { |
| 2060 | 243 if (((iscapture) && (inputDeviceCount == 0)) || |
| 244 ((!iscapture) && (outputDeviceCount == 0))) { | |
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245 SDL_SetError("No such audio device"); |
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246 return 0; |
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247 } |
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248 devname = ((iscapture) ? inputDevices[0] : outputDevices[0]); |
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249 } |
| 0 | 250 |
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251 /* Initialize all variables that we clean on shutdown */ |
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252 this->hidden = (struct SDL_PrivateAudioData *) |
| 2060 | 253 SDL_malloc((sizeof *this->hidden)); |
|
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254 if (this->hidden == NULL) { |
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255 SDL_OutOfMemory(); |
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256 return 0; |
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257 } |
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258 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
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259 |
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260 /* Open the audio device */ |
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261 audio_fd = open(devname, flags, 0); |
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262 if (audio_fd < 0) { |
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263 DMA_CloseDevice(this); |
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264 SDL_SetError("Couldn't open %s: %s", devname, strerror(errno)); |
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265 return 0; |
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266 } |
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267 dma_buf = NULL; |
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268 ioctl(audio_fd, SNDCTL_DSP_RESET, 0); |
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269 |
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270 /* Get a list of supported hardware formats */ |
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271 if (ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0) { |
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272 DMA_CloseDevice(this); |
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273 SDL_SetError("Couldn't get audio format list"); |
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274 return 0; |
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275 } |
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276 |
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277 /* Try for a closest match on audio format */ |
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278 format = 0; |
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279 for (test_format = SDL_FirstAudioFormat(this->spec.format); |
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280 !format && test_format;) { |
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281 #ifdef DEBUG_AUDIO |
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282 fprintf(stderr, "Trying format 0x%4.4x\n", test_format); |
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283 #endif |
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284 switch (test_format) { |
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285 case AUDIO_U8: |
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286 if (value & AFMT_U8) { |
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287 format = AFMT_U8; |
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288 } |
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289 break; |
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290 case AUDIO_S8: |
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291 if (value & AFMT_S8) { |
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292 format = AFMT_S8; |
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293 } |
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294 break; |
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295 case AUDIO_S16LSB: |
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296 if (value & AFMT_S16_LE) { |
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297 format = AFMT_S16_LE; |
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298 } |
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299 break; |
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300 case AUDIO_S16MSB: |
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301 if (value & AFMT_S16_BE) { |
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302 format = AFMT_S16_BE; |
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303 } |
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304 break; |
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305 case AUDIO_U16LSB: |
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306 if (value & AFMT_U16_LE) { |
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307 format = AFMT_U16_LE; |
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308 } |
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309 break; |
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310 case AUDIO_U16MSB: |
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311 if (value & AFMT_U16_BE) { |
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312 format = AFMT_U16_BE; |
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313 } |
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314 break; |
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315 default: |
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316 format = 0; |
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317 break; |
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318 } |
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319 if (!format) { |
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320 test_format = SDL_NextAudioFormat(); |
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321 } |
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322 } |
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323 if (format == 0) { |
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324 DMA_CloseDevice(this); |
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325 SDL_SetError("Couldn't find any hardware audio formats"); |
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326 return 0; |
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327 } |
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328 this->spec.format = test_format; |
| 0 | 329 |
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330 /* Set the audio format */ |
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331 value = format; |
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332 if ((ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) || (value != format)) { |
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333 DMA_CloseDevice(this); |
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334 SDL_SetError("Couldn't set audio format"); |
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335 return 0; |
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336 } |
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337 |
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338 /* Set mono or stereo audio (currently only two channels supported) */ |
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339 stereo = (this->spec.channels > 1); |
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340 ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo); |
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341 if (stereo) { |
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342 this->spec.channels = 2; |
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343 } else { |
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344 this->spec.channels = 1; |
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345 } |
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346 |
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347 /* Because some drivers don't allow setting the buffer size |
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348 after setting the format, we must re-open the audio device |
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349 once we know what format and channels are supported |
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350 */ |
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351 if (DMA_ReopenAudio(this, devname, format, stereo) < 0) { |
|
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352 DMA_CloseDevice(this); |
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353 /* Error is set by DMA_ReopenAudio() */ |
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354 return 0; |
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355 } |
| 0 | 356 |
|
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357 /* Memory map the audio buffer */ |
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358 if (ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info) < 0) { |
|
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359 DMA_CloseDevice(this); |
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360 SDL_SetError("Couldn't get OSPACE parameters"); |
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361 return 0; |
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362 } |
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363 this->spec.size = info.fragsize; |
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364 this->spec.samples = this->spec.size / ((this->spec.format & 0xFF) / 8); |
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365 this->spec.samples /= this->spec.channels; |
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366 num_buffers = info.fragstotal; |
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367 dma_len = num_buffers * this->spec.size; |
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368 dma_buf = (Uint8 *) mmap(NULL, dma_len, PROT_WRITE, MAP_SHARED, |
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369 audio_fd, 0); |
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370 if (dma_buf == MAP_FAILED) { |
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371 DMA_CloseDevice(this); |
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372 SDL_SetError("DMA memory map failed"); |
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373 dma_buf = NULL; |
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374 return 0; |
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375 } |
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376 SDL_memset(dma_buf, this->spec.silence, dma_len); |
| 0 | 377 |
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378 /* Check to see if we need to use select() workaround */ |
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379 { |
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380 char *workaround; |
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381 workaround = SDL_getenv("SDL_DSP_NOSELECT"); |
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382 if (workaround) { |
| 2060 | 383 frame_ticks = |
| 384 (float) (this->spec.samples * 1000) / this->spec.freq; | |
|
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385 next_frame = SDL_GetTicks() + frame_ticks; |
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386 } |
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387 } |
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388 |
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389 /* Trigger audio playback */ |
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390 value = 0; |
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391 ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &value); |
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392 value = PCM_ENABLE_OUTPUT; |
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393 if (ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &value) < 0) { |
|
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394 DMA_CloseDevice(this); |
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395 SDL_SetError("Couldn't trigger audio output"); |
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396 return 0; |
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397 } |
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398 |
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399 /* Get the parent process id (we're the parent of the audio thread) */ |
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400 parent = getpid(); |
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401 |
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402 /* We're ready to rock and roll. :-) */ |
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403 return 1; |
| 0 | 404 } |
| 405 | |
| 406 | |
| 407 /* This function waits until it is possible to write a full sound buffer */ | |
|
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408 static void |
|
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409 DMA_WaitDevice(_THIS) |
| 0 | 410 { |
|
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411 fd_set fdset; |
| 0 | 412 |
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413 /* Check to see if the thread-parent process is still alive */ |
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414 { |
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415 static int cnt = 0; |
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416 /* Note that this only works with thread implementations |
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417 that use a different process id for each thread. |
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418 */ |
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419 if (parent && (((++cnt) % 10) == 0)) { /* Check every 10 loops */ |
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420 if (kill(parent, 0) < 0) { |
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421 this->enabled = 0; |
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422 } |
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423 } |
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424 } |
| 0 | 425 |
|
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426 /* See if we need to use timed audio synchronization */ |
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427 if (frame_ticks) { |
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428 /* Use timer for general audio synchronization */ |
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429 Sint32 ticks; |
| 0 | 430 |
|
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431 ticks = ((Sint32) (next_frame - SDL_GetTicks())) - FUDGE_TICKS; |
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432 if (ticks > 0) { |
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433 SDL_Delay(ticks); |
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434 } |
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435 } else { |
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436 /* Use select() for audio synchronization */ |
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437 struct timeval timeout; |
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438 FD_ZERO(&fdset); |
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439 FD_SET(audio_fd, &fdset); |
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440 timeout.tv_sec = 10; |
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441 timeout.tv_usec = 0; |
| 0 | 442 #ifdef DEBUG_AUDIO |
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443 fprintf(stderr, "Waiting for audio to get ready\n"); |
| 0 | 444 #endif |
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445 if (select(audio_fd + 1, NULL, &fdset, NULL, &timeout) <= 0) { |
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446 const char *message = |
| 0 | 447 #ifdef AUDIO_OSPACE_HACK |
|
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448 "Audio timeout - buggy audio driver? (trying ospace)"; |
| 0 | 449 #else |
|
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450 "Audio timeout - buggy audio driver? (disabled)"; |
| 0 | 451 #endif |
|
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452 /* In general we should never print to the screen, |
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453 but in this case we have no other way of letting |
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454 the user know what happened. |
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455 */ |
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456 fprintf(stderr, "SDL: %s\n", message); |
| 0 | 457 #ifdef AUDIO_OSPACE_HACK |
|
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458 /* We may be able to use GET_OSPACE trick */ |
|
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459 frame_ticks = (float) (this->spec.samples * 1000) / |
|
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460 this->spec.freq; |
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461 next_frame = SDL_GetTicks() + frame_ticks; |
| 0 | 462 #else |
|
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463 this->enabled = 0; |
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464 /* Don't try to close - may hang */ |
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465 audio_fd = -1; |
| 0 | 466 #ifdef DEBUG_AUDIO |
|
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467 fprintf(stderr, "Done disabling audio\n"); |
| 0 | 468 #endif |
| 469 #endif /* AUDIO_OSPACE_HACK */ | |
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470 } |
| 0 | 471 #ifdef DEBUG_AUDIO |
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472 fprintf(stderr, "Ready!\n"); |
| 0 | 473 #endif |
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474 } |
| 0 | 475 } |
| 476 | |
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477 static void |
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478 DMA_PlayDevice(_THIS) |
| 0 | 479 { |
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480 /* If timer synchronization is enabled, set the next write frame */ |
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481 if (frame_ticks) { |
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482 next_frame += frame_ticks; |
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483 } |
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484 return; |
| 0 | 485 } |
| 486 | |
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487 static Uint8 * |
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488 DMA_GetDeviceBuf(_THIS) |
| 0 | 489 { |
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490 count_info info; |
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491 int playing; |
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492 int filling; |
| 0 | 493 |
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494 /* Get number of blocks, looping if we're not using select() */ |
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495 do { |
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496 if (ioctl(audio_fd, SNDCTL_DSP_GETOPTR, &info) < 0) { |
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497 /* Uh oh... */ |
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498 this->enabled = 0; |
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499 return (NULL); |
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500 } |
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First commit. Added header configs for DS as well as a Makefile. Initial work on framebuffer video driver, currently not functioning as desired.
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501 } while (frame_ticks && (info.blocks < 1)); |
| 0 | 502 #ifdef DEBUG_AUDIO |
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503 if (info.blocks > 1) { |
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504 printf("Warning: audio underflow (%d frags)\n", info.blocks - 1); |
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505 } |
| 0 | 506 #endif |
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507 playing = info.ptr / this->spec.size; |
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508 filling = (playing + 1) % num_buffers; |
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509 return (dma_buf + (filling * this->spec.size)); |
| 0 | 510 } |
| 511 | |
| 512 | |
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513 static int |
| 2060 | 514 DMA_Init(SDL_AudioDriverImpl * impl) |
| 0 | 515 { |
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516 /* Set the function pointers */ |
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517 impl->DetectDevices = DMA_DetectDevices; |
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518 impl->GetDeviceName = DMA_GetDeviceName; |
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519 impl->OpenDevice = DMA_OpenDevice; |
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520 impl->WaitDevice = DMA_WaitDevice; |
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521 impl->PlayDevice = DMA_PlayDevice; |
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522 impl->GetDeviceBuf = DMA_GetDeviceBuf; |
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523 impl->CloseDevice = DMA_CloseDevice; |
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524 impl->Deinitialize = DMA_Deinitialize; |
| 0 | 525 |
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526 build_device_lists(); |
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527 return 1; |
| 0 | 528 } |
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529 |
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530 AudioBootStrap DMA_bootstrap = { |
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531 DMA_DRIVER_NAME, "OSS /dev/dsp DMA audio", DMA_Init, 0 |
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532 }; |
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533 |
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534 /* vi: set ts=4 sw=4 expandtab: */ |