Mercurial > sdl-ios-xcode
annotate src/audio/dma/SDL_dmaaudio.c @ 3817:103bbe13f5eb SDL-ryan-multiple-audio-device
Patched to compile.
author | Ryan C. Gordon <icculus@icculus.org> |
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date | Fri, 06 Oct 2006 04:49:48 +0000 |
parents | 9d070c1a45fa |
children | 66fb40445587 |
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 */ | |
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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) |
0 | 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) && |
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77 (ioctl(fd, SNDCTL_DSP_GETOSPACE, &info) == 0)) |
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78 { |
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79 size_t len = info.fragstotal * info.fragsize; |
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80 Uint8 *buf = (Uint8 *) mmap(NULL, len, PROT_WRITE, MAP_SHARED, fd, 0); |
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81 if (buf != MAP_FAILED) { |
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82 munmap(buf, len); |
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83 return 1; |
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84 } |
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85 } |
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86 return 0; |
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87 } |
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88 |
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89 |
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90 static inline void |
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91 free_device_list(char ***devs, int *count) |
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92 { |
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93 SDL_FreeUnixAudioDevices(devs, count); |
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94 } |
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95 |
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96 static inline void |
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97 build_device_list(int iscapture, char ***devs, int *count) |
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98 { |
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99 const int flags = ((iscapture) ? OPEN_FLAGS_INPUT : OPEN_FLAGS_OUTPUT); |
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100 free_device_list(devs, count); |
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101 SDL_EnumUnixAudioDevices(flags, 0, test_for_mmap, devs, count); |
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102 } |
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103 |
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104 static inline void |
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105 build_device_lists(void) |
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106 { |
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107 build_device_list(0, &outputDevices, &outputDeviceCount); |
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108 build_device_list(1, &inputDevices, &inputDeviceCount); |
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109 } |
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110 |
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111 |
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112 static inline void |
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113 free_device_lists(void) |
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114 { |
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115 free_device_list(&outputDevices, &outputDeviceCount); |
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116 free_device_list(&inputDevices, &inputDeviceCount); |
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117 } |
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118 |
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119 static int |
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120 DMA_Available(void) |
0 | 121 { |
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122 int available = 0; |
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123 build_device_lists(); |
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124 available = ((outputDeviceCount > 0) || (inputDeviceCount > 0)); |
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125 free_device_lists(); |
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126 return available; |
0 | 127 } |
128 | |
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129 static void DMA_Deinitialize(void) |
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130 { |
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131 free_device_lists(); |
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132 } |
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133 |
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134 static int |
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135 DMA_DetectDevices(int iscapture) |
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136 { |
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137 if (iscapture) { |
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138 build_device_list(1, &inputDevices, &inputDeviceCount); |
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139 return inputDeviceCount; |
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140 } else { |
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141 build_device_list(0, &outputDevices, &outputDeviceCount); |
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142 return outputDeviceCount; |
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143 } |
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144 |
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145 return 0; /* shouldn't ever hit this. */ |
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146 } |
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147 |
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148 |
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149 static const char * |
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150 DMA_GetDeviceName(int index, int iscapture) |
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151 { |
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152 if ((iscapture) && (index < inputDeviceCount)) { |
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153 return inputDevices[index]; |
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154 } else if ((!iscapture) && (index < outputDeviceCount)) { |
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155 return outputDevices[index]; |
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156 } |
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157 |
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158 SDL_SetError("No such device"); |
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159 return NULL; |
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160 } |
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161 |
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162 |
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163 static int |
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164 DMA_ReopenAudio(_THIS, const char *audiodev, int format, int stereo) |
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165 { |
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166 int frag_spec; |
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167 int value; |
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168 |
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169 /* Close and then reopen the audio device */ |
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170 close(audio_fd); |
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171 audio_fd = open(audiodev, O_RDWR, 0); |
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172 if (audio_fd < 0) { |
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173 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno)); |
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174 return (-1); |
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175 } |
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176 |
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177 /* Calculate the final parameters for this audio specification */ |
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178 SDL_CalculateAudioSpec(&this->spec); |
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179 |
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180 /* Determine the power of two of the fragment size */ |
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181 for (frag_spec = 0; (0x01 << frag_spec) < this->spec.size; ++frag_spec); |
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182 if ((0x01 << frag_spec) != this->spec.size) { |
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183 SDL_SetError("Fragment size must be a power of two"); |
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184 return (-1); |
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185 } |
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186 |
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187 /* Set the audio buffering parameters */ |
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188 if (ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0) { |
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189 SDL_SetError("Couldn't set audio fragment spec"); |
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190 return (-1); |
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191 } |
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192 |
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193 /* Set the audio format */ |
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194 value = format; |
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195 if ((ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) || (value != format)) { |
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196 SDL_SetError("Couldn't set audio format"); |
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197 return (-1); |
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198 } |
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199 |
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200 /* Set mono or stereo audio */ |
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201 value = (this->spec.channels > 1); |
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202 if ((ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo) < 0) || |
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203 (value != stereo)) { |
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204 SDL_SetError("Couldn't set audio channels"); |
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205 return (-1); |
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206 } |
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207 |
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208 /* Set the DSP frequency */ |
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209 value = this->spec.freq; |
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210 if (ioctl(audio_fd, SNDCTL_DSP_SPEED, &value) < 0) { |
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211 SDL_SetError("Couldn't set audio frequency"); |
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212 return (-1); |
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213 } |
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214 this->spec.freq = value; |
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215 |
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216 /* We successfully re-opened the audio */ |
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217 return (0); |
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218 } |
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219 |
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220 |
3817 | 221 static void |
222 DMA_CloseDevice(_THIS) | |
223 { | |
224 if (this->hidden != NULL) { | |
225 if (dma_buf != NULL) { | |
226 munmap(dma_buf, dma_len); | |
227 dma_buf = NULL; | |
228 } | |
229 if (audio_fd >= 0) { | |
230 close(audio_fd); | |
231 audio_fd = -1; | |
232 } | |
233 SDL_free(this->hidden); | |
234 this->hidden = NULL; | |
235 } | |
236 } | |
237 | |
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238 |
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239 static int |
3817 | 240 DMA_OpenDevice(_THIS, const char *devname, int iscapture) |
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241 { |
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242 const int flags = ((iscapture) ? OPEN_FLAGS_INPUT : OPEN_FLAGS_OUTPUT); |
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243 int format; |
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244 int stereo; |
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245 int value; |
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246 SDL_AudioFormat test_format; |
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247 struct audio_buf_info info; |
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248 |
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249 /* We don't care what the devname is...we'll try to open anything. */ |
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250 /* ...but default to first name in the list... */ |
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251 if (devname == NULL) { |
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252 if ( ((iscapture) && (inputDeviceCount == 0)) || |
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253 ((!iscapture) && (outputDeviceCount == 0)) ) { |
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254 SDL_SetError("No such audio device"); |
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255 return 0; |
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256 } |
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257 devname = ((iscapture) ? inputDevices[0] : outputDevices[0]); |
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258 } |
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259 |
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260 /* Initialize all variables that we clean on shutdown */ |
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261 this->hidden = (struct SDL_PrivateAudioData *) |
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262 SDL_malloc((sizeof *this->hidden)); |
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263 if (this->hidden == NULL) { |
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264 SDL_OutOfMemory(); |
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265 return 0; |
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266 } |
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267 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
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268 |
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269 /* Open the audio device */ |
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Multiple audio device code is now working for dsp and dma targets.
Ryan C. Gordon <icculus@icculus.org>
parents:
3798
diff
changeset
|
270 audio_fd = open(devname, flags, 0); |
3795
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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parents:
1982
diff
changeset
|
271 if (audio_fd < 0) { |
3817 | 272 DMA_CloseDevice(this); |
3810
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Multiple audio device code is now working for dsp and dma targets.
Ryan C. Gordon <icculus@icculus.org>
parents:
3798
diff
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|
273 SDL_SetError("Couldn't open %s: %s", devname, strerror(errno)); |
3795
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
274 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
|
275 } |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
276 dma_buf = NULL; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
277 ioctl(audio_fd, SNDCTL_DSP_RESET, 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
|
278 |
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 /* Get a list of supported hardware 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
diff
changeset
|
280 if (ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0) { |
3817 | 281 DMA_CloseDevice(this); |
3795
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More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
282 SDL_SetError("Couldn't get audio format list"); |
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
|
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!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
285 |
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
|
286 /* Try for a closest match on audio 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
|
287 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
|
288 for (test_format = SDL_FirstAudioFormat(this->spec.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
|
289 !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
|
290 #ifdef DEBUG_AUDIO |
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
|
291 fprintf(stderr, "Trying format 0x%4.4x\n", 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
|
292 #endif |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
293 switch (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
|
294 case AUDIO_U8: |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
295 if (value & AFMT_U8) { |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
296 format = AFMT_U8; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
297 } |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
298 break; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
299 case AUDIO_S8: |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
300 if (value & AFMT_S8) { |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
301 format = AFMT_S8; |
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!
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1982
diff
changeset
|
303 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
|
304 case AUDIO_S16LSB: |
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
|
305 if (value & AFMT_S16_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
|
306 format = AFMT_S16_LE; |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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1982
diff
changeset
|
307 } |
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
|
308 break; |
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
|
309 case AUDIO_S16MSB: |
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
|
310 if (value & 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
|
311 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>
parents:
1982
diff
changeset
|
312 } |
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
|
313 break; |
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 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>
parents:
1982
diff
changeset
|
315 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>
parents:
1982
diff
changeset
|
316 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>
parents:
1982
diff
changeset
|
317 } |
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
|
318 break; |
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
|
319 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>
parents:
1982
diff
changeset
|
320 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>
parents:
1982
diff
changeset
|
321 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>
parents:
1982
diff
changeset
|
322 } |
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 break; |
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
|
324 default: |
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
|
325 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
|
326 break; |
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
|
327 } |
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 if (!format) { |
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 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>
parents:
1982
diff
changeset
|
330 } |
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
|
331 } |
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 if (format == 0) { |
3817 | 333 DMA_CloseDevice(this); |
3795
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 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>
parents:
1982
diff
changeset
|
335 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
|
336 } |
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
|
337 this->spec.format = test_format; |
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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1982
diff
changeset
|
339 /* Set the audio format */ |
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 value = format; |
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
|
341 if ((ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) || (value != format)) { |
3817 | 342 DMA_CloseDevice(this); |
3795
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
|
343 SDL_SetError("Couldn't set audio format"); |
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
|
344 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
|
345 } |
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
|
346 |
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 /* 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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parents:
1982
diff
changeset
|
348 stereo = (this->spec.channels > 1); |
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
|
349 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>
parents:
1982
diff
changeset
|
350 if (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
|
351 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
diff
changeset
|
352 } else { |
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 this->spec.channels = 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
|
354 } |
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!
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1982
diff
changeset
|
356 /* 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
|
357 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!
Ryan C. Gordon <icculus@icculus.org>
parents:
1982
diff
changeset
|
358 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>
parents:
1982
diff
changeset
|
359 */ |
3810
2c5387c0a642
Multiple audio device code is now working for dsp and dma targets.
Ryan C. Gordon <icculus@icculus.org>
parents:
3798
diff
changeset
|
360 if (DMA_ReopenAudio(this, devname, format, stereo) < 0) { |
3817 | 361 DMA_CloseDevice(this); |
3795
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 /* Error is set by DMA_ReopenAudio() */ |
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 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
|
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 /* 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>
parents:
1982
diff
changeset
|
367 if (ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info) < 0) { |
3817 | 368 DMA_CloseDevice(this); |
3795
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
|
369 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
|
370 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
|
371 } |
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
|
372 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>
parents:
1982
diff
changeset
|
373 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>
parents:
1982
diff
changeset
|
374 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>
parents:
1982
diff
changeset
|
375 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>
parents:
1982
diff
changeset
|
376 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>
parents:
1982
diff
changeset
|
377 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
|
378 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>
parents:
1982
diff
changeset
|
379 if (dma_buf == MAP_FAILED) { |
3817 | 380 DMA_CloseDevice(this); |
3795
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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381 SDL_SetError("DMA memory map failed"); |
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382 dma_buf = NULL; |
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383 return 0; |
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384 } |
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385 SDL_memset(dma_buf, this->spec.silence, dma_len); |
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|
386 |
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|
387 /* Check to see if we need to use select() workaround */ |
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388 { |
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389 char *workaround; |
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390 workaround = SDL_getenv("SDL_DSP_NOSELECT"); |
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391 if (workaround) { |
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392 frame_ticks = (float) (this->spec.samples*1000) / this->spec.freq; |
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393 next_frame = SDL_GetTicks() + frame_ticks; |
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394 } |
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395 } |
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396 |
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397 /* Trigger audio playback */ |
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398 value = 0; |
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399 ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &value); |
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400 value = PCM_ENABLE_OUTPUT; |
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401 if (ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &value) < 0) { |
3817 | 402 DMA_CloseDevice(this); |
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403 SDL_SetError("Couldn't trigger audio output"); |
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404 return 0; |
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405 } |
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406 |
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407 /* Get the parent process id (we're the parent of the audio thread) */ |
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408 parent = getpid(); |
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409 |
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|
410 /* We're ready to rock and roll. :-) */ |
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411 return 1; |
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|
412 } |
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|
413 |
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414 |
0 | 415 /* This function waits until it is possible to write a full sound buffer */ |
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416 static void |
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417 DMA_WaitDevice(_THIS) |
0 | 418 { |
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419 fd_set fdset; |
0 | 420 |
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421 /* Check to see if the thread-parent process is still alive */ |
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422 { |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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423 static int cnt = 0; |
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424 /* Note that this only works with thread implementations |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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425 that use a different process id for each thread. |
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426 */ |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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427 if (parent && (((++cnt) % 10) == 0)) { /* Check every 10 loops */ |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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428 if (kill(parent, 0) < 0) { |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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429 this->enabled = 0; |
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430 } |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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431 } |
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432 } |
0 | 433 |
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434 /* See if we need to use timed audio synchronization */ |
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435 if (frame_ticks) { |
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436 /* Use timer for general audio synchronization */ |
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437 Sint32 ticks; |
0 | 438 |
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439 ticks = ((Sint32) (next_frame - SDL_GetTicks())) - FUDGE_TICKS; |
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440 if (ticks > 0) { |
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441 SDL_Delay(ticks); |
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442 } |
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443 } else { |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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444 /* Use select() for audio synchronization */ |
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|
445 struct timeval timeout; |
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446 FD_ZERO(&fdset); |
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|
447 FD_SET(audio_fd, &fdset); |
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Sam Lantinga <slouken@libsdl.org>
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|
448 timeout.tv_sec = 10; |
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|
449 timeout.tv_usec = 0; |
0 | 450 #ifdef DEBUG_AUDIO |
1895
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|
451 fprintf(stderr, "Waiting for audio to get ready\n"); |
0 | 452 #endif |
1895
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|
453 if (select(audio_fd + 1, NULL, &fdset, NULL, &timeout) <= 0) { |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
454 const char *message = |
0 | 455 #ifdef AUDIO_OSPACE_HACK |
1895
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|
456 "Audio timeout - buggy audio driver? (trying ospace)"; |
0 | 457 #else |
1895
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
458 "Audio timeout - buggy audio driver? (disabled)"; |
0 | 459 #endif |
1895
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
460 /* In general we should never print to the screen, |
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|
461 but in this case we have no other way of letting |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
462 the user know what happened. |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
463 */ |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
464 fprintf(stderr, "SDL: %s\n", message); |
0 | 465 #ifdef AUDIO_OSPACE_HACK |
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|
466 /* We may be able to use GET_OSPACE trick */ |
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|
467 frame_ticks = (float) (this->spec.samples * 1000) / |
589bc3d060cd
More 1.3 audio work...moved dsp and dma drivers over to new model. Untested!
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diff
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|
468 this->spec.freq; |
1895
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|
469 next_frame = SDL_GetTicks() + frame_ticks; |
0 | 470 #else |
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|
471 this->enabled = 0; |
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|
472 /* Don't try to close - may hang */ |
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|
473 audio_fd = -1; |
0 | 474 #ifdef DEBUG_AUDIO |
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|
475 fprintf(stderr, "Done disabling audio\n"); |
0 | 476 #endif |
477 #endif /* AUDIO_OSPACE_HACK */ | |
1895
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478 } |
0 | 479 #ifdef DEBUG_AUDIO |
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|
480 fprintf(stderr, "Ready!\n"); |
0 | 481 #endif |
1895
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482 } |
0 | 483 } |
484 | |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
485 static void |
3795
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|
486 DMA_PlayDevice(_THIS) |
0 | 487 { |
1895
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|
488 /* If timer synchronization is enabled, set the next write frame */ |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
489 if (frame_ticks) { |
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|
490 next_frame += frame_ticks; |
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|
491 } |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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492 return; |
0 | 493 } |
494 | |
1895
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|
495 static Uint8 * |
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|
496 DMA_GetDeviceBuf(_THIS) |
0 | 497 { |
1895
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|
498 count_info info; |
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|
499 int playing; |
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|
500 int filling; |
0 | 501 |
1895
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|
502 /* Get number of blocks, looping if we're not using select() */ |
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|
503 do { |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
504 if (ioctl(audio_fd, SNDCTL_DSP_GETOPTR, &info) < 0) { |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
505 /* Uh oh... */ |
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|
506 this->enabled = 0; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
507 return (NULL); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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508 } |
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509 } |
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510 while (frame_ticks && (info.blocks < 1)); |
0 | 511 #ifdef DEBUG_AUDIO |
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512 if (info.blocks > 1) { |
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513 printf("Warning: audio underflow (%d frags)\n", info.blocks - 1); |
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514 } |
0 | 515 #endif |
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516 playing = info.ptr / this->spec.size; |
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517 filling = (playing + 1) % num_buffers; |
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518 return (dma_buf + (filling * this->spec.size)); |
0 | 519 } |
520 | |
521 | |
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522 static int |
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523 DMA_Init(SDL_AudioDriverImpl *impl) |
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524 { |
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525 /* Set the function pointers */ |
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526 impl->DetectDevices = DMA_DetectDevices; |
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527 impl->GetDeviceName = DMA_GetDeviceName; |
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528 impl->OpenDevice = DMA_OpenDevice; |
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529 impl->WaitDevice = DMA_WaitDevice; |
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530 impl->PlayDevice = DMA_PlayDevice; |
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531 impl->GetDeviceBuf = DMA_GetDeviceBuf; |
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532 impl->CloseDevice = DMA_CloseDevice; |
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533 impl->Deinitialize = DMA_Deinitialize; |
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534 |
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535 build_device_lists(); |
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536 return 1; |
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537 } |
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538 |
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539 AudioBootStrap DMA_bootstrap = { |
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540 DMA_DRIVER_NAME, "OSS /dev/dsp DMA audio", |
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541 DMA_Available, DMA_Init, 0 |
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542 }; |
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543 |
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544 /* vi: set ts=4 sw=4 expandtab: */ |