Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 2866:e532417a6977
Fixed SDL 1.2 compatibility problem.
The API specifies that SDL_OpenAudio() will fill out the 'desired' audio spec
with the correct samples and size set by the driver. This value is important
since it may be used by applications that size audio buffers, etc.
However, we want to allow advanced applications to call SDL_OpenAudioDevice()
which gets passed a const 'desired' parameter, and have the correct data filled
into the 'obtained' parameter, possibly allowing or not allowing format changes.
So... 'obtained' becomes the audio format the user callback is expected to use,
and we add flags to allow the application to specify which format changes are
allowed.
Note: We really need to add a way to query the 'obtained' audio spec.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sat, 13 Dec 2008 06:36:47 +0000 |
parents | 99210400e8b9 |
children | 2929ed239d2a |
rev | line source |
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0 | 1 /* |
2 SDL - Simple DirectMedia Layer | |
2859 | 3 Copyright (C) 1997-2009 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 |
24 /* Allow access to a raw mixing buffer */ | |
25 | |
26 #include "SDL.h" | |
27 #include "SDL_audio_c.h" | |
28 #include "SDL_audiomem.h" | |
29 #include "SDL_sysaudio.h" | |
30 | |
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31 #define _THIS SDL_AudioDevice *this |
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32 |
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33 static SDL_AudioDriver current_audio; |
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34 static SDL_AudioDevice *open_devices[16]; |
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35 |
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36 /* !!! FIXME: These are wordy and unlocalized... */ |
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37 #define DEFAULT_OUTPUT_DEVNAME "System audio output device" |
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38 #define DEFAULT_INPUT_DEVNAME "System audio capture device" |
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39 |
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40 |
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41 /* |
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42 * Not all of these will be compiled and linked in, but it's convenient |
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43 * to have a complete list here and saves yet-another block of #ifdefs... |
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44 * Please see bootstrap[], below, for the actual #ifdef mess. |
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45 */ |
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46 extern AudioBootStrap BSD_AUDIO_bootstrap; |
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47 extern AudioBootStrap DSP_bootstrap; |
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48 extern AudioBootStrap DMA_bootstrap; |
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49 extern AudioBootStrap ALSA_bootstrap; |
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50 extern AudioBootStrap PULSEAUDIO_bootstrap; |
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51 extern AudioBootStrap QNXNTOAUDIO_bootstrap; |
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52 extern AudioBootStrap SUNAUDIO_bootstrap; |
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53 extern AudioBootStrap DMEDIA_bootstrap; |
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54 extern AudioBootStrap ARTS_bootstrap; |
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55 extern AudioBootStrap ESD_bootstrap; |
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56 extern AudioBootStrap NAS_bootstrap; |
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57 extern AudioBootStrap DSOUND_bootstrap; |
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58 extern AudioBootStrap WINWAVEOUT_bootstrap; |
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59 extern AudioBootStrap PAUDIO_bootstrap; |
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60 extern AudioBootStrap BEOSAUDIO_bootstrap; |
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61 extern AudioBootStrap COREAUDIO_bootstrap; |
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62 extern AudioBootStrap COREAUDIOIPHONE_bootstrap; |
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63 extern AudioBootStrap SNDMGR_bootstrap; |
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64 extern AudioBootStrap MINTAUDIO_GSXB_bootstrap; |
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65 extern AudioBootStrap MINTAUDIO_MCSN_bootstrap; |
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66 extern AudioBootStrap MINTAUDIO_STFA_bootstrap; |
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67 extern AudioBootStrap MINTAUDIO_XBIOS_bootstrap; |
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68 extern AudioBootStrap MINTAUDIO_DMA8_bootstrap; |
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69 extern AudioBootStrap DISKAUD_bootstrap; |
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70 extern AudioBootStrap DUMMYAUD_bootstrap; |
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71 extern AudioBootStrap DCAUD_bootstrap; |
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72 extern AudioBootStrap MMEAUDIO_bootstrap; |
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73 extern AudioBootStrap DART_bootstrap; |
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74 extern AudioBootStrap NDSAUD_bootstrap; |
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75 |
1190 | 76 |
0 | 77 /* Available audio drivers */ |
78 static AudioBootStrap *bootstrap[] = { | |
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79 #if SDL_AUDIO_DRIVER_BSD |
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80 &BSD_AUDIO_bootstrap, |
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81 #endif |
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82 #if SDL_AUDIO_DRIVER_OSS |
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83 &DSP_bootstrap, |
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84 &DMA_bootstrap, |
0 | 85 #endif |
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86 #if SDL_AUDIO_DRIVER_ALSA |
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87 &ALSA_bootstrap, |
0 | 88 #endif |
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89 #if SDL_AUDIO_DRIVER_PULSEAUDIO |
2274 | 90 &PULSEAUDIO_bootstrap, |
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91 #endif |
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92 #if SDL_AUDIO_DRIVER_QNXNTO |
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93 &QNXNTOAUDIO_bootstrap, |
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94 #endif |
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95 #if SDL_AUDIO_DRIVER_SUNAUDIO |
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96 &SUNAUDIO_bootstrap, |
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97 #endif |
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98 #if SDL_AUDIO_DRIVER_DMEDIA |
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99 &DMEDIA_bootstrap, |
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100 #endif |
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101 #if SDL_AUDIO_DRIVER_ARTS |
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102 &ARTS_bootstrap, |
0 | 103 #endif |
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104 #if SDL_AUDIO_DRIVER_ESD |
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105 &ESD_bootstrap, |
0 | 106 #endif |
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107 #if SDL_AUDIO_DRIVER_NAS |
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108 &NAS_bootstrap, |
0 | 109 #endif |
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110 #if SDL_AUDIO_DRIVER_DSOUND |
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111 &DSOUND_bootstrap, |
0 | 112 #endif |
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113 #if SDL_AUDIO_DRIVER_WINWAVEOUT |
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114 &WINWAVEOUT_bootstrap, |
0 | 115 #endif |
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116 #if SDL_AUDIO_DRIVER_PAUDIO |
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117 &PAUDIO_bootstrap, |
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118 #endif |
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119 #if SDL_AUDIO_DRIVER_BEOSAUDIO |
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120 &BEOSAUDIO_bootstrap, |
0 | 121 #endif |
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122 #if SDL_AUDIO_DRIVER_COREAUDIO |
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123 &COREAUDIO_bootstrap, |
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124 #endif |
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125 #if SDL_AUDIO_DRIVER_COREAUDIOIPHONE |
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126 &COREAUDIOIPHONE_bootstrap, |
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127 #endif |
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128 #if SDL_AUDIO_DRIVER_SNDMGR |
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129 &SNDMGR_bootstrap, |
0 | 130 #endif |
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131 #if SDL_AUDIO_DRIVER_MINT |
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132 &MINTAUDIO_GSXB_bootstrap, |
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133 &MINTAUDIO_MCSN_bootstrap, |
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134 &MINTAUDIO_STFA_bootstrap, |
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135 &MINTAUDIO_XBIOS_bootstrap, |
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136 &MINTAUDIO_DMA8_bootstrap, |
398
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137 #endif |
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138 #if SDL_AUDIO_DRIVER_DISK |
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139 &DISKAUD_bootstrap, |
68
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140 #endif |
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141 #if SDL_AUDIO_DRIVER_DUMMY |
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142 &DUMMYAUD_bootstrap, |
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143 #endif |
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144 #if SDL_AUDIO_DRIVER_DC |
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145 &DCAUD_bootstrap, |
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146 #endif |
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147 #if SDL_AUDIO_DRIVER_MMEAUDIO |
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148 &MMEAUDIO_bootstrap, |
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149 #endif |
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150 #if SDL_AUDIO_DRIVER_DART |
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151 &DART_bootstrap, |
1190 | 152 #endif |
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153 #if SDL_AUDIO_DRIVER_NDS |
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154 &NDSAUD_bootstrap, |
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155 #endif |
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156 NULL |
0 | 157 }; |
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158 |
2060 | 159 static SDL_AudioDevice * |
160 get_audio_device(SDL_AudioDeviceID id) | |
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161 { |
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162 id--; |
2060 | 163 if ((id >= SDL_arraysize(open_devices)) || (open_devices[id] == NULL)) { |
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164 SDL_SetError("Invalid audio device ID"); |
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165 return NULL; |
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166 } |
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167 |
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168 return open_devices[id]; |
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169 } |
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170 |
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171 |
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172 /* stubs for audio drivers that don't need a specific entry point... */ |
2060 | 173 static int |
174 SDL_AudioDetectDevices_Default(int iscapture) | |
175 { | |
176 return -1; | |
177 } | |
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178 |
2060 | 179 static void |
180 SDL_AudioThreadInit_Default(_THIS) | |
181 { /* no-op. */ | |
182 } | |
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183 |
2060 | 184 static void |
185 SDL_AudioWaitDevice_Default(_THIS) | |
186 { /* no-op. */ | |
187 } | |
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188 |
2060 | 189 static void |
190 SDL_AudioPlayDevice_Default(_THIS) | |
191 { /* no-op. */ | |
192 } | |
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193 |
2060 | 194 static Uint8 * |
195 SDL_AudioGetDeviceBuf_Default(_THIS) | |
196 { | |
197 return NULL; | |
198 } | |
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199 |
2060 | 200 static void |
201 SDL_AudioWaitDone_Default(_THIS) | |
202 { /* no-op. */ | |
203 } | |
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204 |
2060 | 205 static void |
206 SDL_AudioCloseDevice_Default(_THIS) | |
207 { /* no-op. */ | |
208 } | |
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209 |
2060 | 210 static void |
211 SDL_AudioDeinitialize_Default(void) | |
212 { /* no-op. */ | |
213 } | |
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214 |
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215 static int |
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216 SDL_AudioOpenDevice_Default(_THIS, const char *devname, int iscapture) |
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217 { |
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218 return 0; |
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219 } |
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220 |
2060 | 221 static const char * |
222 SDL_AudioGetDeviceName_Default(int index, int iscapture) | |
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223 { |
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224 SDL_SetError("No such device"); |
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225 return NULL; |
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226 } |
0 | 227 |
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228 static void |
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229 SDL_AudioLockDevice_Default(SDL_AudioDevice * device) |
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230 { |
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231 if (device->thread && (SDL_ThreadID() == device->threadid)) { |
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232 return; |
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233 } |
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234 SDL_mutexP(device->mixer_lock); |
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235 } |
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236 |
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237 static void |
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238 SDL_AudioUnlockDevice_Default(SDL_AudioDevice * device) |
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239 { |
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240 if (device->thread && (SDL_ThreadID() == device->threadid)) { |
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241 return; |
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242 } |
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243 SDL_mutexV(device->mixer_lock); |
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244 } |
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245 |
0 | 246 |
2060 | 247 static void |
248 finalize_audio_entry_points(void) | |
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249 { |
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250 /* |
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251 * Fill in stub functions for unused driver entry points. This lets us |
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252 * blindly call them without having to check for validity first. |
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253 */ |
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254 |
2060 | 255 #define FILL_STUB(x) \ |
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256 if (current_audio.impl.x == NULL) { \ |
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257 current_audio.impl.x = SDL_Audio##x##_Default; \ |
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258 } |
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259 FILL_STUB(DetectDevices); |
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260 FILL_STUB(GetDeviceName); |
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261 FILL_STUB(OpenDevice); |
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262 FILL_STUB(ThreadInit); |
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263 FILL_STUB(WaitDevice); |
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264 FILL_STUB(PlayDevice); |
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265 FILL_STUB(GetDeviceBuf); |
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266 FILL_STUB(WaitDone); |
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267 FILL_STUB(CloseDevice); |
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268 FILL_STUB(LockDevice); |
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269 FILL_STUB(UnlockDevice); |
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270 FILL_STUB(Deinitialize); |
2060 | 271 #undef FILL_STUB |
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272 } |
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273 |
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274 /* Streaming functions (for when the input and output buffer sizes are different) */ |
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275 /* Write [length] bytes from buf into the streamer */ |
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276 void |
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277 SDL_StreamWrite(SDL_AudioStreamer * stream, Uint8 * buf, int length) |
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278 { |
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279 int i; |
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280 |
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281 for (i = 0; i < length; ++i) { |
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282 stream->buffer[stream->write_pos] = buf[i]; |
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283 ++stream->write_pos; |
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284 } |
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285 } |
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286 |
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287 /* Read [length] bytes out of the streamer into buf */ |
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288 void |
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289 SDL_StreamRead(SDL_AudioStreamer * stream, Uint8 * buf, int length) |
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290 { |
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291 int i; |
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292 |
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293 for (i = 0; i < length; ++i) { |
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294 buf[i] = stream->buffer[stream->read_pos]; |
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295 ++stream->read_pos; |
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296 } |
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297 } |
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298 |
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299 int |
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300 SDL_StreamLength(SDL_AudioStreamer * stream) |
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301 { |
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302 return (stream->write_pos - stream->read_pos) % stream->max_len; |
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303 } |
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304 |
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305 /* Initialize the stream by allocating the buffer and setting the read/write heads to the beginning */ |
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306 int |
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307 SDL_StreamInit(SDL_AudioStreamer * stream, int max_len, Uint8 silence) |
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308 { |
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309 /* First try to allocate the buffer */ |
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310 stream->buffer = (Uint8 *) SDL_malloc(max_len); |
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311 if (stream->buffer == NULL) { |
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312 return -1; |
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313 } |
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314 |
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315 stream->max_len = max_len; |
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316 stream->read_pos = 0; |
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317 stream->write_pos = 0; |
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318 |
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319 /* Zero out the buffer */ |
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320 SDL_memset(stream->buffer, silence, max_len); |
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321 |
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322 return 0; |
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323 } |
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324 |
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325 /* Deinitialize the stream simply by freeing the buffer */ |
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326 void |
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327 SDL_StreamDeinit(SDL_AudioStreamer * stream) |
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328 { |
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329 if (stream->buffer != NULL) { |
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330 SDL_free(stream->buffer); |
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331 } |
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332 } |
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333 |
0 | 334 |
335 /* The general mixing thread function */ | |
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336 int SDLCALL |
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337 SDL_RunAudio(void *devicep) |
0 | 338 { |
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339 SDL_AudioDevice *device = (SDL_AudioDevice *) devicep; |
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340 Uint8 *stream; |
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341 int stream_len; |
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342 void *udata; |
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343 void (SDLCALL * fill) (void *userdata, Uint8 * stream, int len); |
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344 int silence; |
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345 int stream_max_len; |
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346 |
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347 /* For streaming when the buffer sizes don't match up */ |
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348 Uint8 *istream; |
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349 int istream_len; |
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351 /* Perform any thread setup */ |
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352 device->threadid = SDL_ThreadID(); |
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353 current_audio.impl.ThreadInit(device); |
0 | 354 |
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355 /* Set up the mixing function */ |
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356 fill = device->spec.callback; |
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357 udata = device->spec.userdata; |
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358 |
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359 /* By default do not stream */ |
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360 device->use_streamer = 0; |
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361 |
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362 if (device->convert.needed) { |
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363 if (device->convert.src_format == AUDIO_U8) { |
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364 silence = 0x80; |
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365 } else { |
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366 silence = 0; |
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367 } |
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368 |
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369 /* If the result of the conversion alters the length, i.e. resampling is being used, use the streamer */ |
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370 if (device->convert.len_mult != 1 || device->convert.len_div != 1) { |
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371 /* The streamer's maximum length should be twice whichever is larger: spec.size or len_cvt */ |
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372 stream_max_len = 2 * device->spec.size; |
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373 if (device->convert.len_mult > device->convert.len_div) { |
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374 stream_max_len *= device->convert.len_mult; |
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375 stream_max_len /= device->convert.len_div; |
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376 } |
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377 if (SDL_StreamInit(&device->streamer, stream_max_len, silence) < |
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378 0) |
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379 return -1; |
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380 device->use_streamer = 1; |
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381 |
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382 /* istream_len should be the length of what we grab from the callback and feed to conversion, |
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383 so that we get close to spec_size. I.e. we want device.spec_size = istream_len * u / d |
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384 */ |
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385 istream_len = |
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386 device->spec.size * device->convert.len_div / |
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387 device->convert.len_mult; |
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388 } |
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389 |
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390 /* stream_len = device->convert.len; */ |
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391 stream_len = device->spec.size; |
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392 } else { |
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393 silence = device->spec.silence; |
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394 stream_len = device->spec.size; |
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395 } |
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396 |
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397 /* Determine if the streamer is necessary here */ |
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398 if (device->use_streamer == 1) { |
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399 /* This code is almost the same as the old code. The difference is, instead of reding |
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400 directly from the callback into "stream", then converting and sending the audio off, |
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401 we go: callback -> "istream" -> (conversion) -> streamer -> stream -> device. |
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402 However, reading and writing with streamer are done separately: |
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403 - We only call the callback and write to the streamer when the streamer does not |
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404 contain enough samples to output to the device. |
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405 - We only read from the streamer and tell the device to play when the streamer |
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406 does have enough samples to output. |
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407 This allows us to perform resampling in the conversion step, where the output of the |
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408 resampling process can be any number. We will have to see what a good size for the |
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409 stream's maximum length is, but I suspect 2*max(len_cvt, stream_len) is a good figure. |
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410 */ |
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411 while (device->enabled) { |
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412 /* Only read in audio if the streamer doesn't have enough already (if it does not have enough samples to output) */ |
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413 if (SDL_StreamLength(&device->streamer) < stream_len) { |
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414 /* Set up istream */ |
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415 if (device->convert.needed) { |
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416 if (device->convert.buf) { |
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417 istream = device->convert.buf; |
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418 } else { |
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419 continue; |
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420 } |
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421 } else { |
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422 istream = current_audio.impl.GetDeviceBuf(device); |
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423 if (istream == NULL) { |
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424 istream = device->fake_stream; |
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425 } |
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426 } |
0 | 427 |
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428 /* Read from the callback into the _input_ stream */ |
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429 if (!device->paused) { |
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430 SDL_mutexP(device->mixer_lock); |
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431 (*fill) (udata, istream, istream_len); |
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432 SDL_mutexV(device->mixer_lock); |
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433 } |
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434 |
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435 /* Convert the audio if necessary and write to the streamer */ |
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436 if (device->convert.needed) { |
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437 SDL_ConvertAudio(&device->convert); |
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438 if (istream == NULL) { |
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439 istream = device->fake_stream; |
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440 } |
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441 /*SDL_memcpy(istream, device->convert.buf, device->convert.len_cvt); */ |
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442 SDL_StreamWrite(&device->streamer, device->convert.buf, |
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443 device->convert.len_cvt); |
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444 } else { |
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445 SDL_StreamWrite(&device->streamer, istream, istream_len); |
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446 } |
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447 } |
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448 |
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449 /* Only output audio if the streamer has enough to output */ |
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450 if (SDL_StreamLength(&device->streamer) >= stream_len) { |
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451 /* Set up the output stream */ |
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452 if (device->convert.needed) { |
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453 if (device->convert.buf) { |
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454 stream = device->convert.buf; |
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455 } else { |
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456 continue; |
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457 } |
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458 } else { |
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459 stream = current_audio.impl.GetDeviceBuf(device); |
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460 if (stream == NULL) { |
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461 stream = device->fake_stream; |
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462 } |
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463 } |
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464 |
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465 /* Now read from the streamer */ |
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466 SDL_StreamRead(&device->streamer, stream, stream_len); |
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467 |
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468 /* Ready current buffer for play and change current buffer */ |
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469 if (stream != device->fake_stream) { |
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470 current_audio.impl.PlayDevice(device); |
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471 } |
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472 |
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473 /* Wait for an audio buffer to become available */ |
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474 if (stream == device->fake_stream) { |
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475 SDL_Delay((device->spec.samples * 1000) / |
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476 device->spec.freq); |
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477 } else { |
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478 current_audio.impl.WaitDevice(device); |
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479 } |
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480 } |
0 | 481 |
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482 } |
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483 } else { |
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484 /* Otherwise, do not use the streamer. This is the old code. */ |
0 | 485 |
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486 /* Loop, filling the audio buffers */ |
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487 while (device->enabled) { |
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488 |
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489 /* Fill the current buffer with sound */ |
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490 if (device->convert.needed) { |
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491 if (device->convert.buf) { |
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492 stream = device->convert.buf; |
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493 } else { |
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494 continue; |
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495 } |
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496 } else { |
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497 stream = current_audio.impl.GetDeviceBuf(device); |
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498 if (stream == NULL) { |
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499 stream = device->fake_stream; |
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500 } |
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501 } |
0 | 502 |
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503 if (!device->paused) { |
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504 SDL_mutexP(device->mixer_lock); |
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505 (*fill) (udata, stream, stream_len); |
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506 SDL_mutexV(device->mixer_lock); |
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507 } |
1562 | 508 |
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509 /* Convert the audio if necessary */ |
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510 if (device->convert.needed) { |
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511 SDL_ConvertAudio(&device->convert); |
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512 stream = current_audio.impl.GetDeviceBuf(device); |
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513 if (stream == NULL) { |
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514 stream = device->fake_stream; |
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515 } |
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516 SDL_memcpy(stream, device->convert.buf, |
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517 device->convert.len_cvt); |
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518 } |
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519 |
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520 /* Ready current buffer for play and change current buffer */ |
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521 if (stream != device->fake_stream) { |
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522 current_audio.impl.PlayDevice(device); |
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523 } |
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524 |
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|
525 /* Wait for an audio buffer to become available */ |
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526 if (stream == device->fake_stream) { |
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527 SDL_Delay((device->spec.samples * 1000) / device->spec.freq); |
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528 } else { |
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529 current_audio.impl.WaitDevice(device); |
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530 } |
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531 } |
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532 } |
1562 | 533 |
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534 /* Wait for the audio to drain.. */ |
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|
535 current_audio.impl.WaitDone(device); |
21
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|
536 |
2716
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537 /* If necessary, deinit the streamer */ |
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538 if (device->use_streamer == 1) |
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539 SDL_StreamDeinit(&device->streamer); |
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540 |
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541 return (0); |
0 | 542 } |
543 | |
322
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544 |
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545 static SDL_AudioFormat |
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546 SDL_ParseAudioFormat(const char *string) |
1794 | 547 { |
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548 #define CHECK_FMT_STRING(x) if (SDL_strcmp(string, #x) == 0) return AUDIO_##x |
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549 CHECK_FMT_STRING(U8); |
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550 CHECK_FMT_STRING(S8); |
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551 CHECK_FMT_STRING(U16LSB); |
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552 CHECK_FMT_STRING(S16LSB); |
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553 CHECK_FMT_STRING(U16MSB); |
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554 CHECK_FMT_STRING(S16MSB); |
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555 CHECK_FMT_STRING(U16SYS); |
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556 CHECK_FMT_STRING(S16SYS); |
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557 CHECK_FMT_STRING(U16); |
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|
558 CHECK_FMT_STRING(S16); |
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559 CHECK_FMT_STRING(S32LSB); |
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560 CHECK_FMT_STRING(S32MSB); |
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561 CHECK_FMT_STRING(S32SYS); |
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562 CHECK_FMT_STRING(S32); |
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563 CHECK_FMT_STRING(F32LSB); |
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564 CHECK_FMT_STRING(F32MSB); |
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565 CHECK_FMT_STRING(F32SYS); |
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|
566 CHECK_FMT_STRING(F32); |
2060 | 567 #undef CHECK_FMT_STRING |
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|
568 return 0; |
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569 } |
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570 |
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571 int |
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572 SDL_GetNumAudioDrivers(void) |
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573 { |
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574 return (SDL_arraysize(bootstrap) - 1); |
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575 } |
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576 |
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577 const char * |
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|
578 SDL_GetAudioDriver(int index) |
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579 { |
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580 if (index >= 0 && index < SDL_GetNumAudioDrivers()) { |
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581 return (bootstrap[index]->name); |
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582 } |
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583 return (NULL); |
1794 | 584 } |
585 | |
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586 int |
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587 SDL_AudioInit(const char *driver_name) |
0 | 588 { |
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589 int i = 0; |
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590 int initialized = 0; |
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591 int tried_to_init = 0; |
0 | 592 |
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593 if (SDL_WasInit(SDL_INIT_AUDIO)) { |
2060 | 594 SDL_AudioQuit(); /* shutdown driver if already running. */ |
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595 } |
0 | 596 |
2060 | 597 SDL_memset(¤t_audio, '\0', sizeof(current_audio)); |
598 SDL_memset(open_devices, '\0', sizeof(open_devices)); | |
2049
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599 |
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600 /* Select the proper audio driver */ |
1909
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Look at environment variables in SDL_VideoInit() and SDL_AudioInit()
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601 if (driver_name == NULL) { |
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Look at environment variables in SDL_VideoInit() and SDL_AudioInit()
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602 driver_name = SDL_getenv("SDL_AUDIODRIVER"); |
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603 } |
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604 |
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605 for (i = 0; (!initialized) && (bootstrap[i]); ++i) { |
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606 /* make sure we should even try this driver before doing so... */ |
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607 const AudioBootStrap *backend = bootstrap[i]; |
2060 | 608 if (((driver_name) && (SDL_strcasecmp(backend->name, driver_name))) || |
609 ((!driver_name) && (backend->demand_only))) { | |
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610 continue; |
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611 } |
0 | 612 |
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613 tried_to_init = 1; |
2060 | 614 SDL_memset(¤t_audio, 0, sizeof(current_audio)); |
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615 current_audio.name = backend->name; |
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616 current_audio.desc = backend->desc; |
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617 initialized = backend->init(¤t_audio.impl); |
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618 } |
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619 |
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620 if (!initialized) { |
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621 /* specific drivers will set the error message if they fail... */ |
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622 if (!tried_to_init) { |
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623 if (driver_name) { |
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624 SDL_SetError("%s not available", driver_name); |
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625 } else { |
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626 SDL_SetError("No available audio device"); |
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627 } |
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|
628 } |
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629 |
2060 | 630 SDL_memset(¤t_audio, 0, sizeof(current_audio)); |
631 return (-1); /* No driver was available, so fail. */ | |
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632 } |
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633 |
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634 finalize_audio_entry_points(); |
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635 |
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636 return (0); |
0 | 637 } |
638 | |
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639 /* |
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|
640 * Get the current audio driver name |
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641 */ |
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642 const char * |
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643 SDL_GetCurrentAudioDriver() |
0 | 644 { |
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645 return current_audio.name; |
0 | 646 } |
647 | |
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648 |
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649 int |
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650 SDL_GetNumAudioDevices(int iscapture) |
0 | 651 { |
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652 if (!SDL_WasInit(SDL_INIT_AUDIO)) { |
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653 return -1; |
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654 } |
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655 if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) { |
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656 return 0; |
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657 } |
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658 |
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659 if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) { |
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660 return 1; |
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661 } |
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662 |
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663 if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) { |
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664 return 1; |
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665 } |
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666 |
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667 return current_audio.impl.DetectDevices(iscapture); |
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668 } |
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669 |
0 | 670 |
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671 const char * |
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672 SDL_GetAudioDeviceName(int index, int iscapture) |
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673 { |
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674 if (!SDL_WasInit(SDL_INIT_AUDIO)) { |
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675 SDL_SetError("Audio subsystem is not initialized"); |
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676 return NULL; |
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677 } |
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678 |
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679 if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) { |
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680 SDL_SetError("No capture support"); |
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681 return NULL; |
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682 } |
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683 |
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684 if (index < 0) { |
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685 SDL_SetError("No such device"); |
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686 return NULL; |
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687 } |
0 | 688 |
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689 if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) { |
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690 return DEFAULT_INPUT_DEVNAME; |
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691 } |
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692 |
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693 if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) { |
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694 return DEFAULT_OUTPUT_DEVNAME; |
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695 } |
262
ba5363e21df8
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|
696 |
2049
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697 return current_audio.impl.GetDeviceName(index, iscapture); |
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698 } |
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699 |
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700 |
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701 static void |
2060 | 702 close_audio_device(SDL_AudioDevice * device) |
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703 { |
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704 device->enabled = 0; |
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705 if (device->thread != NULL) { |
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706 SDL_WaitThread(device->thread, NULL); |
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707 } |
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708 if (device->mixer_lock != NULL) { |
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709 SDL_DestroyMutex(device->mixer_lock); |
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|
710 } |
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|
711 if (device->fake_stream != NULL) { |
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712 SDL_FreeAudioMem(device->fake_stream); |
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713 } |
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|
714 if (device->convert.needed) { |
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|
715 SDL_FreeAudioMem(device->convert.buf); |
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|
716 } |
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|
717 if (device->opened) { |
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718 current_audio.impl.CloseDevice(device); |
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|
719 device->opened = 0; |
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|
720 } |
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|
721 SDL_FreeAudioMem(device); |
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722 } |
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|
723 |
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|
724 |
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|
725 /* |
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|
726 * Sanity check desired AudioSpec for SDL_OpenAudio() in (orig). |
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|
727 * Fills in a sanitized copy in (prepared). |
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728 * Returns non-zero if okay, zero on fatal parameters in (orig). |
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|
729 */ |
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|
730 static int |
2060 | 731 prepare_audiospec(const SDL_AudioSpec * orig, SDL_AudioSpec * prepared) |
2049
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|
732 { |
2060 | 733 SDL_memcpy(prepared, orig, sizeof(SDL_AudioSpec)); |
2049
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|
734 |
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735 if (orig->callback == NULL) { |
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|
736 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); |
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|
737 return 0; |
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738 } |
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739 |
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740 if (orig->freq == 0) { |
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|
741 const char *env = SDL_getenv("SDL_AUDIO_FREQUENCY"); |
2060 | 742 if ((!env) || ((prepared->freq = SDL_atoi(env)) == 0)) { |
743 prepared->freq = 22050; /* a reasonable default */ | |
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744 } |
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745 } |
2049
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746 |
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747 if (orig->format == 0) { |
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748 const char *env = SDL_getenv("SDL_AUDIO_FORMAT"); |
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749 if ((!env) || ((prepared->format = SDL_ParseAudioFormat(env)) == 0)) { |
2060 | 750 prepared->format = AUDIO_S16; /* a reasonable default */ |
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751 } |
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752 } |
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753 |
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|
754 switch (orig->channels) { |
2060 | 755 case 0:{ |
756 const char *env = SDL_getenv("SDL_AUDIO_CHANNELS"); | |
2141 | 757 if ((!env) || ((prepared->channels = (Uint8) SDL_atoi(env)) == 0)) { |
2060 | 758 prepared->channels = 2; /* a reasonable default */ |
759 } | |
760 break; | |
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761 } |
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|
762 case 1: /* Mono */ |
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|
763 case 2: /* Stereo */ |
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|
764 case 4: /* surround */ |
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765 case 6: /* surround with center and lfe */ |
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|
766 break; |
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|
767 default: |
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|
768 SDL_SetError("Unsupported number of audio channels."); |
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|
769 return 0; |
1895
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|
770 } |
2049
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diff
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|
771 |
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|
772 if (orig->samples == 0) { |
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|
773 const char *env = SDL_getenv("SDL_AUDIO_SAMPLES"); |
2060 | 774 if ((!env) || ((prepared->samples = (Uint16) SDL_atoi(env)) == 0)) { |
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|
775 /* Pick a default of ~46 ms at desired frequency */ |
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|
776 /* !!! FIXME: remove this when the non-Po2 resampling is in. */ |
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|
777 const int samples = (prepared->freq / 1000) * 46; |
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|
778 int power2 = 1; |
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|
779 while (power2 < samples) { |
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|
780 power2 *= 2; |
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|
781 } |
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|
782 prepared->samples = power2; |
1895
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|
783 } |
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|
784 } |
0 | 785 |
1895
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|
786 /* Calculate the silence and size of the audio specification */ |
2049
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|
787 SDL_CalculateAudioSpec(prepared); |
21
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|
788 |
2049
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|
789 return 1; |
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|
790 } |
1408
ceb5c2fec4f1
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diff
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|
791 |
21
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|
792 |
2049
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|
793 static SDL_AudioDeviceID |
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|
794 open_audio_device(const char *devname, int iscapture, |
2866
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795 const SDL_AudioSpec * desired, SDL_AudioSpec * obtained, |
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796 int allowed_changes, int min_id) |
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|
797 { |
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798 SDL_AudioDeviceID id = 0; |
2866
e532417a6977
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|
799 SDL_AudioSpec _obtained; |
2049
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|
800 SDL_AudioDevice *device; |
2866
e532417a6977
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|
801 SDL_bool build_cvt; |
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802 int i = 0; |
21
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|
803 |
2049
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|
804 if (!SDL_WasInit(SDL_INIT_AUDIO)) { |
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|
805 SDL_SetError("Audio subsystem is not initialized"); |
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|
806 return 0; |
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|
807 } |
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|
808 |
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|
809 if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) { |
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|
810 SDL_SetError("No capture support"); |
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|
811 return 0; |
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|
812 } |
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|
813 |
2866
e532417a6977
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|
814 if (!obtained) { |
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diff
changeset
|
815 obtained = &_obtained; |
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diff
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|
816 } |
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Fixed SDL 1.2 compatibility problem.
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|
817 if (!prepare_audiospec(desired, obtained)) { |
2049
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818 return 0; |
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|
819 } |
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|
820 |
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|
821 /* If app doesn't care about a specific device, let the user override. */ |
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822 if (devname == NULL) { |
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|
823 devname = SDL_getenv("SDL_AUDIO_DEVICE_NAME"); |
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824 } |
21
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|
825 |
2049
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|
826 /* |
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|
827 * Catch device names at the high level for the simple case... |
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|
828 * This lets us have a basic "device enumeration" for systems that |
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|
829 * don't have multiple devices, but makes sure the device name is |
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|
830 * always NULL when it hits the low level. |
5f6550e5184f
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|
831 * |
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|
832 * Also make sure that the simple case prevents multiple simultaneous |
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|
833 * opens of the default system device. |
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|
834 */ |
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|
835 |
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|
836 if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) { |
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|
837 if ((devname) && (SDL_strcmp(devname, DEFAULT_INPUT_DEVNAME) != 0)) { |
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|
838 SDL_SetError("No such device"); |
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|
839 return 0; |
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|
840 } |
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|
841 devname = NULL; |
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changeset
|
842 |
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|
843 for (i = 0; i < SDL_arraysize(open_devices); i++) { |
5f6550e5184f
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|
844 if ((open_devices[i]) && (open_devices[i]->iscapture)) { |
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|
845 SDL_SetError("Audio device already open"); |
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|
846 return 0; |
5f6550e5184f
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diff
changeset
|
847 } |
5f6550e5184f
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changeset
|
848 } |
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|
849 } |
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|
850 |
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|
851 if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) { |
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|
852 if ((devname) && (SDL_strcmp(devname, DEFAULT_OUTPUT_DEVNAME) != 0)) { |
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|
853 SDL_SetError("No such device"); |
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|
854 return 0; |
5f6550e5184f
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changeset
|
855 } |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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changeset
|
856 devname = NULL; |
5f6550e5184f
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changeset
|
857 |
5f6550e5184f
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diff
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|
858 for (i = 0; i < SDL_arraysize(open_devices); i++) { |
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|
859 if ((open_devices[i]) && (!open_devices[i]->iscapture)) { |
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|
860 SDL_SetError("Audio device already open"); |
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|
861 return 0; |
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|
862 } |
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changeset
|
863 } |
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|
864 } |
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|
865 |
2060 | 866 device = (SDL_AudioDevice *) SDL_AllocAudioMem(sizeof(SDL_AudioDevice)); |
2049
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|
867 if (device == NULL) { |
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|
868 SDL_OutOfMemory(); |
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|
869 return 0; |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
870 } |
2060 | 871 SDL_memset(device, '\0', sizeof(SDL_AudioDevice)); |
2866
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
872 device->spec = *obtained; |
2049
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
873 device->enabled = 1; |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
874 device->paused = 1; |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
875 device->iscapture = iscapture; |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
876 |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
877 /* Create a semaphore for locking the sound buffers */ |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
878 if (!current_audio.impl.SkipMixerLock) { |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
879 device->mixer_lock = SDL_CreateMutex(); |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
880 if (device->mixer_lock == NULL) { |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
881 close_audio_device(device); |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
882 SDL_SetError("Couldn't create mixer lock"); |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
883 return 0; |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
884 } |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
885 } |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
886 |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
887 if (!current_audio.impl.OpenDevice(device, devname, iscapture)) { |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
888 close_audio_device(device); |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
889 return 0; |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
890 } |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
891 device->opened = 1; |
0 | 892 |
1895
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1794
diff
changeset
|
893 /* Allocate a fake audio memory buffer */ |
2049
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
894 device->fake_stream = SDL_AllocAudioMem(device->spec.size); |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
895 if (device->fake_stream == NULL) { |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
896 close_audio_device(device); |
1895
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1794
diff
changeset
|
897 SDL_OutOfMemory(); |
2049
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
898 return 0; |
1895
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1794
diff
changeset
|
899 } |
0 | 900 |
2866
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
901 /* If the audio driver changes the buffer size, accept it */ |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
902 if (device->spec.samples != obtained->samples) { |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
903 obtained->samples = device->spec.samples; |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
904 SDL_CalculateAudioSpec(obtained); |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
905 } |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
906 |
1895
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1794
diff
changeset
|
907 /* See if we need to do any conversion */ |
2866
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
908 build_cvt = SDL_FALSE; |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
909 if (obtained->freq != device->spec.freq) { |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
910 if (allowed_changes & SDL_AUDIO_ALLOW_FREQUENCY_CHANGE) { |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
911 obtained->freq = device->spec.freq; |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
912 } else { |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
913 build_cvt = SDL_TRUE; |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
914 } |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
915 } |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
916 if (obtained->format != device->spec.format) { |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
917 if (allowed_changes & SDL_AUDIO_ALLOW_FORMAT_CHANGE) { |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
918 obtained->format = device->spec.format; |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
919 } else { |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
920 build_cvt = SDL_TRUE; |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
921 } |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
922 } |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
923 if (obtained->channels != device->spec.channels) { |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
924 if (allowed_changes & SDL_AUDIO_ALLOW_CHANNELS_CHANGE) { |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
925 obtained->channels = device->spec.channels; |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
926 } else { |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
927 build_cvt = SDL_TRUE; |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
928 } |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
929 } |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
930 if (build_cvt) { |
1895
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1794
diff
changeset
|
931 /* Build an audio conversion block */ |
2049
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
932 if (SDL_BuildAudioCVT(&device->convert, |
2866
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
933 obtained->format, obtained->channels, |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
934 obtained->freq, |
2049
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
935 device->spec.format, device->spec.channels, |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
936 device->spec.freq) < 0) { |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
937 close_audio_device(device); |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
938 return 0; |
1895
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1794
diff
changeset
|
939 } |
2049
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
940 if (device->convert.needed) { |
2866
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
parents:
2859
diff
changeset
|
941 device->convert.len = (int) (((double) obtained->size) / |
2060 | 942 device->convert.len_ratio); |
2053
716cf90f24a0
1.3 branch version of revision 2878.
Ryan C. Gordon <icculus@icculus.org>
parents:
2049
diff
changeset
|
943 |
2049
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
944 device->convert.buf = |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
945 (Uint8 *) SDL_AllocAudioMem(device->convert.len * |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
946 device->convert.len_mult); |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
947 if (device->convert.buf == NULL) { |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
948 close_audio_device(device); |
1895
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1794
diff
changeset
|
949 SDL_OutOfMemory(); |
2049
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
950 return 0; |
1895
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1794
diff
changeset
|
951 } |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1794
diff
changeset
|
952 } |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1794
diff
changeset
|
953 } |
2049
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
954 |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
955 /* Find an available device ID and store the structure... */ |
2060 | 956 for (id = min_id - 1; id < SDL_arraysize(open_devices); id++) { |
2049
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
957 if (open_devices[id] == NULL) { |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
958 open_devices[id] = device; |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
959 break; |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
960 } |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
961 } |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
962 |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
963 if (id == SDL_arraysize(open_devices)) { |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
964 SDL_SetError("Too many open audio devices"); |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
965 close_audio_device(device); |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
966 return 0; |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
967 } |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
968 |
1895
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1794
diff
changeset
|
969 /* Start the audio thread if necessary */ |
2049
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
970 if (!current_audio.impl.ProvidesOwnCallbackThread) { |
1895
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1794
diff
changeset
|
971 /* Start the audio thread */ |
2049
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
972 /* !!! FIXME: this is nasty. */ |
1402
d910939febfa
Use consistent identifiers for the various platforms we support.
Sam Lantinga <slouken@libsdl.org>
parents:
1379
diff
changeset
|
973 #if (defined(__WIN32__) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC) |
1330
450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
|
974 #undef SDL_CreateThread |
2049
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
975 device->thread = SDL_CreateThread(SDL_RunAudio, device, NULL, NULL); |
1330
450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
|
976 #else |
2049
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
977 device->thread = SDL_CreateThread(SDL_RunAudio, device); |
1330
450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
|
978 #endif |
2049
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
979 if (device->thread == NULL) { |
2060 | 980 SDL_CloseAudioDevice(id + 1); |
1895
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1794
diff
changeset
|
981 SDL_SetError("Couldn't create audio thread"); |
2049
5f6550e5184f
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|
982 return 0; |
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|
983 } |
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diff
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|
984 } |
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diff
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|
985 |
2060 | 986 return id + 1; |
2049
5f6550e5184f
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diff
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|
987 } |
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diff
changeset
|
988 |
5f6550e5184f
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diff
changeset
|
989 |
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Ryan C. Gordon <icculus@icculus.org>
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diff
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|
990 int |
2866
e532417a6977
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Sam Lantinga <slouken@libsdl.org>
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diff
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|
991 SDL_OpenAudio(SDL_AudioSpec * desired, SDL_AudioSpec * obtained) |
2049
5f6550e5184f
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|
992 { |
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Ryan C. Gordon <icculus@icculus.org>
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diff
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|
993 SDL_AudioDeviceID id = 0; |
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|
994 |
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diff
changeset
|
995 /* Start up the audio driver, if necessary. This is legacy behaviour! */ |
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|
996 if (!SDL_WasInit(SDL_INIT_AUDIO)) { |
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|
997 if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) { |
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Sam Lantinga <slouken@libsdl.org>
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|
998 return (-1); |
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Sam Lantinga <slouken@libsdl.org>
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diff
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|
999 } |
2049
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
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diff
changeset
|
1000 } |
0 | 1001 |
2049
5f6550e5184f
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Ryan C. Gordon <icculus@icculus.org>
parents:
2045
diff
changeset
|
1002 /* SDL_OpenAudio() is legacy and can only act on Device ID #1. */ |
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|
1003 if (open_devices[0] != NULL) { |
5f6550e5184f
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parents:
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diff
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|
1004 SDL_SetError("Audio device is already opened"); |
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|
1005 return (-1); |
1895
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|
1006 } |
2049
5f6550e5184f
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|
1007 |
2866
e532417a6977
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Sam Lantinga <slouken@libsdl.org>
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diff
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|
1008 if (obtained) { |
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Fixed SDL 1.2 compatibility problem.
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diff
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|
1009 id = open_audio_device(NULL, 0, desired, obtained, |
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Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
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diff
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|
1010 SDL_AUDIO_ALLOW_ANY_CHANGE, 1); |
e532417a6977
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|
1011 } else { |
e532417a6977
Fixed SDL 1.2 compatibility problem.
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|
1012 id = open_audio_device(NULL, 0, desired, desired, 0, 1); |
e532417a6977
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Sam Lantinga <slouken@libsdl.org>
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diff
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|
1013 } |
2060 | 1014 if (id > 1) { /* this should never happen in theory... */ |
2049
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|
1015 SDL_CloseAudioDevice(id); |
2060 | 1016 SDL_SetError("Internal error"); /* MUST be Device ID #1! */ |
2049
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|
1017 return (-1); |
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|
1018 } |
21
75a95f82bc1f
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Sam Lantinga <slouken@lokigames.com>
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0
diff
changeset
|
1019 |
2049
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|
1020 return ((id == 0) ? -1 : 0); |
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|
1021 } |
21
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
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|
1022 |
2049
5f6550e5184f
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|
1023 SDL_AudioDeviceID |
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|
1024 SDL_OpenAudioDevice(const char *device, int iscapture, |
2866
e532417a6977
Fixed SDL 1.2 compatibility problem.
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|
1025 const SDL_AudioSpec * desired, SDL_AudioSpec * obtained, |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
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2859
diff
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|
1026 int allowed_changes) |
2049
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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|
1027 { |
2866
e532417a6977
Fixed SDL 1.2 compatibility problem.
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diff
changeset
|
1028 return open_audio_device(device, iscapture, desired, obtained, |
e532417a6977
Fixed SDL 1.2 compatibility problem.
Sam Lantinga <slouken@libsdl.org>
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|
1029 allowed_changes, 2); |
1895
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|
1030 } |
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|
1031 |
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Sam Lantinga <slouken@libsdl.org>
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|
1032 SDL_audiostatus |
2049
5f6550e5184f
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|
1033 SDL_GetAudioDeviceStatus(SDL_AudioDeviceID devid) |
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Sam Lantinga <slouken@libsdl.org>
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|
1034 { |
2049
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|
1035 SDL_AudioDevice *device = get_audio_device(devid); |
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|
1036 SDL_audiostatus status = SDL_AUDIO_STOPPED; |
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|
1037 if (device && device->enabled) { |
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diff
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|
1038 if (device->paused) { |
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|
1039 status = SDL_AUDIO_PAUSED; |
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|
1040 } 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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|
1041 status = SDL_AUDIO_PLAYING; |
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|
1042 } |
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|
1043 } |
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|
1044 return (status); |
0 | 1045 } |
1046 | |
2049
5f6550e5184f
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|
1047 |
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Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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changeset
|
1048 SDL_audiostatus |
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diff
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|
1049 SDL_GetAudioStatus(void) |
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|
1050 { |
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Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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changeset
|
1051 return SDL_GetAudioDeviceStatus(1); |
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|
1052 } |
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Ryan C. Gordon <icculus@icculus.org>
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|
1053 |
5f6550e5184f
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changeset
|
1054 void |
5f6550e5184f
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diff
changeset
|
1055 SDL_PauseAudioDevice(SDL_AudioDeviceID devid, int pause_on) |
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|
1056 { |
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|
1057 SDL_AudioDevice *device = get_audio_device(devid); |
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|
1058 if (device) { |
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diff
changeset
|
1059 device->paused = pause_on; |
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|
1060 } |
5f6550e5184f
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|
1061 } |
5f6550e5184f
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|
1062 |
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|
1063 void |
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|
1064 SDL_PauseAudio(int pause_on) |
0 | 1065 { |
2049
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Ryan C. Gordon <icculus@icculus.org>
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|
1066 SDL_PauseAudioDevice(1, pause_on); |
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changeset
|
1067 } |
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|
1068 |
0 | 1069 |
2049
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changeset
|
1070 void |
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parents:
2045
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|
1071 SDL_LockAudioDevice(SDL_AudioDeviceID devid) |
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|
1072 { |
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|
1073 /* Obtain a lock on the mixing buffers */ |
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|
1074 SDL_AudioDevice *device = get_audio_device(devid); |
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|
1075 if (device) { |
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|
1076 current_audio.impl.LockDevice(device); |
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|
1077 } |
0 | 1078 } |
1079 | |
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|
1080 void |
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|
1081 SDL_LockAudio(void) |
0 | 1082 { |
2049
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|
1083 SDL_LockAudioDevice(1); |
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|
1084 } |
0 | 1085 |
2049
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|
1086 void |
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|
1087 SDL_UnlockAudioDevice(SDL_AudioDeviceID devid) |
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|
1088 { |
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|
1089 /* Obtain a lock on the mixing buffers */ |
2049
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|
1090 SDL_AudioDevice *device = get_audio_device(devid); |
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|
1091 if (device) { |
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|
1092 current_audio.impl.UnlockDevice(device); |
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|
1093 } |
0 | 1094 } |
1095 | |
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|
1096 void |
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|
1097 SDL_UnlockAudio(void) |
0 | 1098 { |
2049
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|
1099 SDL_UnlockAudioDevice(1); |
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|
1100 } |
0 | 1101 |
2049
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|
1102 void |
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|
1103 SDL_CloseAudioDevice(SDL_AudioDeviceID devid) |
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|
1104 { |
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|
1105 SDL_AudioDevice *device = get_audio_device(devid); |
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|
1106 if (device) { |
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|
1107 close_audio_device(device); |
2060 | 1108 open_devices[devid - 1] = NULL; |
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|
1109 } |
0 | 1110 } |
1111 | |
1895
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|
1112 void |
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|
1113 SDL_CloseAudio(void) |
0 | 1114 { |
2049
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|
1115 SDL_CloseAudioDevice(1); |
0 | 1116 } |
1117 | |
1895
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|
1118 void |
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|
1119 SDL_AudioQuit(void) |
0 | 1120 { |
2049
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|
1121 SDL_AudioDeviceID i; |
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|
1122 for (i = 0; i < SDL_arraysize(open_devices); i++) { |
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|
1123 SDL_CloseAudioDevice(i); |
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diff
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|
1124 } |
0 | 1125 |
2049
5f6550e5184f
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|
1126 /* Free the driver data */ |
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|
1127 current_audio.impl.Deinitialize(); |
2060 | 1128 SDL_memset(¤t_audio, '\0', sizeof(current_audio)); |
1129 SDL_memset(open_devices, '\0', sizeof(open_devices)); | |
0 | 1130 } |
1131 | |
1982
3b4ce57c6215
First shot at new audio data types (int32 and float32).
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diff
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|
1132 #define NUM_FORMATS 10 |
0 | 1133 static int format_idx; |
1134 static int format_idx_sub; | |
1982
3b4ce57c6215
First shot at new audio data types (int32 and float32).
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diff
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|
1135 static SDL_AudioFormat format_list[NUM_FORMATS][NUM_FORMATS] = { |
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|
1136 {AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, |
1982
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diff
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|
1137 AUDIO_U16MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB}, |
1895
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|
1138 {AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, |
1982
3b4ce57c6215
First shot at new audio data types (int32 and float32).
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diff
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|
1139 AUDIO_U16MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB}, |
3b4ce57c6215
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diff
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|
1140 {AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S32LSB, |
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diff
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|
1141 AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_U8, AUDIO_S8}, |
3b4ce57c6215
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diff
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|
1142 {AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S32MSB, |
3b4ce57c6215
First shot at new audio data types (int32 and float32).
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diff
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|
1143 AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_U8, AUDIO_S8}, |
3b4ce57c6215
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diff
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|
1144 {AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_S32LSB, |
3b4ce57c6215
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diff
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|
1145 AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_U8, AUDIO_S8}, |
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diff
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|
1146 {AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_S32MSB, |
3b4ce57c6215
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diff
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|
1147 AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_U8, AUDIO_S8}, |
1993
7a3889fc9e5d
Reordered the favored audio format list a little.
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diff
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|
1148 {AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_S16LSB, |
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Reordered the favored audio format list a little.
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diff
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|
1149 AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8}, |
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Reordered the favored audio format list a little.
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diff
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|
1150 {AUDIO_S32MSB, AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_S16MSB, |
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Reordered the favored audio format list a little.
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diff
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|
1151 AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8}, |
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Reordered the favored audio format list a little.
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diff
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|
1152 {AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_S16LSB, |
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Reordered the favored audio format list a little.
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diff
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|
1153 AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8}, |
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Reordered the favored audio format list a little.
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|
1154 {AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_S32MSB, AUDIO_S32LSB, AUDIO_S16MSB, |
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Reordered the favored audio format list a little.
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diff
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|
1155 AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8}, |
0 | 1156 }; |
1157 | |
1982
3b4ce57c6215
First shot at new audio data types (int32 and float32).
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diff
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|
1158 SDL_AudioFormat |
3b4ce57c6215
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diff
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|
1159 SDL_FirstAudioFormat(SDL_AudioFormat format) |
0 | 1160 { |
1895
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|
1161 for (format_idx = 0; format_idx < NUM_FORMATS; ++format_idx) { |
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|
1162 if (format_list[format_idx][0] == format) { |
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|
1163 break; |
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|
1164 } |
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|
1165 } |
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|
1166 format_idx_sub = 0; |
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|
1167 return (SDL_NextAudioFormat()); |
0 | 1168 } |
1169 | |
1982
3b4ce57c6215
First shot at new audio data types (int32 and float32).
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diff
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|
1170 SDL_AudioFormat |
1895
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|
1171 SDL_NextAudioFormat(void) |
0 | 1172 { |
1895
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|
1173 if ((format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS)) { |
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|
1174 return (0); |
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|
1175 } |
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|
1176 return (format_list[format_idx][format_idx_sub++]); |
0 | 1177 } |
1178 | |
1895
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|
1179 void |
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|
1180 SDL_CalculateAudioSpec(SDL_AudioSpec * spec) |
0 | 1181 { |
1895
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|
1182 switch (spec->format) { |
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|
1183 case AUDIO_U8: |
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|
1184 spec->silence = 0x80; |
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|
1185 break; |
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|
1186 default: |
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|
1187 spec->silence = 0x00; |
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|
1188 break; |
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|
1189 } |
2049
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|
1190 spec->size = SDL_AUDIO_BITSIZE(spec->format) / 8; |
1895
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|
1191 spec->size *= spec->channels; |
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|
1192 spec->size *= spec->samples; |
0 | 1193 } |
1895
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|
1194 |
2049
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1195 |
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1196 /* |
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1197 * Moved here from SDL_mixer.c, since it relies on internals of an opened |
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1198 * audio device (and is deprecated, by the way!). |
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1199 */ |
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1200 void |
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|
1201 SDL_MixAudio(Uint8 * dst, const Uint8 * src, Uint32 len, int volume) |
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1202 { |
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1203 /* Mix the user-level audio format */ |
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1204 SDL_AudioDevice *device = get_audio_device(1); |
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1205 if (device != NULL) { |
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|
1206 SDL_AudioFormat format; |
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|
1207 if (device->convert.needed) { |
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|
1208 format = device->convert.src_format; |
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1209 } else { |
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|
1210 format = device->spec.format; |
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1211 } |
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|
1212 SDL_MixAudioFormat(dst, src, format, len, volume); |
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1213 } |
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1214 } |
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1215 |
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|
1216 /* vi: set ts=4 sw=4 expandtab: */ |