Mercurial > sdl-ios-xcode
annotate src/audio/windib/SDL_dibaudio.c @ 1663:11775724e3fe SDL-1.3
fine tuning indent output
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 28 May 2006 13:29:03 +0000 |
| parents | 782fd950bd46 |
| children | 4da1ee79c9af |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
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6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
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13 Lesser General Public License for more details. |
| 0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* Allow access to a raw mixing buffer */ | |
| 25 | |
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26 #define WIN32_LEAN_AND_MEAN |
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27 #include <windows.h> |
| 0 | 28 #include <mmsystem.h> |
| 29 | |
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30 #include "SDL_timer.h" |
| 0 | 31 #include "SDL_audio.h" |
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32 #include "../SDL_audio_c.h" |
| 0 | 33 #include "SDL_dibaudio.h" |
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34 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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35 #include "win_ce_semaphore.h" |
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36 #endif |
| 0 | 37 |
| 38 | |
| 39 /* Audio driver functions */ | |
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40 static int DIB_OpenAudio (_THIS, SDL_AudioSpec * spec); |
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41 static void DIB_ThreadInit (_THIS); |
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42 static void DIB_WaitAudio (_THIS); |
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43 static Uint8 *DIB_GetAudioBuf (_THIS); |
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44 static void DIB_PlayAudio (_THIS); |
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45 static void DIB_WaitDone (_THIS); |
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46 static void DIB_CloseAudio (_THIS); |
| 0 | 47 |
| 48 /* Audio driver bootstrap functions */ | |
| 49 | |
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50 static int |
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51 Audio_Available (void) |
| 0 | 52 { |
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53 return (1); |
| 0 | 54 } |
| 55 | |
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56 static void |
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57 Audio_DeleteDevice (SDL_AudioDevice * device) |
| 0 | 58 { |
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59 SDL_free (device->hidden); |
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60 SDL_free (device); |
| 0 | 61 } |
| 62 | |
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63 static SDL_AudioDevice * |
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64 Audio_CreateDevice (int devindex) |
| 0 | 65 { |
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66 SDL_AudioDevice *this; |
| 0 | 67 |
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68 /* Initialize all variables that we clean on shutdown */ |
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69 this = (SDL_AudioDevice *) SDL_malloc (sizeof (SDL_AudioDevice)); |
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70 if (this) { |
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71 SDL_memset (this, 0, (sizeof *this)); |
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72 this->hidden = (struct SDL_PrivateAudioData *) |
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73 SDL_malloc ((sizeof *this->hidden)); |
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74 } |
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75 if ((this == NULL) || (this->hidden == NULL)) { |
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76 SDL_OutOfMemory (); |
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77 if (this) { |
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78 SDL_free (this); |
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79 } |
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80 return (0); |
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81 } |
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82 SDL_memset (this->hidden, 0, (sizeof *this->hidden)); |
| 0 | 83 |
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84 /* Set the function pointers */ |
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85 this->OpenAudio = DIB_OpenAudio; |
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86 this->ThreadInit = DIB_ThreadInit; |
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87 this->WaitAudio = DIB_WaitAudio; |
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88 this->PlayAudio = DIB_PlayAudio; |
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89 this->GetAudioBuf = DIB_GetAudioBuf; |
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90 this->WaitDone = DIB_WaitDone; |
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91 this->CloseAudio = DIB_CloseAudio; |
| 0 | 92 |
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93 this->free = Audio_DeleteDevice; |
| 0 | 94 |
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95 return this; |
| 0 | 96 } |
| 97 | |
| 98 AudioBootStrap WAVEOUT_bootstrap = { | |
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99 "waveout", "Win95/98/NT/2000 WaveOut", |
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100 Audio_Available, Audio_CreateDevice |
| 0 | 101 }; |
| 102 | |
| 103 | |
| 104 /* The Win32 callback for filling the WAVE device */ | |
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105 static void CALLBACK |
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106 FillSound (HWAVEOUT hwo, UINT uMsg, DWORD_PTR dwInstance, |
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107 DWORD dwParam1, DWORD dwParam2) |
| 0 | 108 { |
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109 SDL_AudioDevice *this = (SDL_AudioDevice *) dwInstance; |
| 0 | 110 |
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111 /* Only service "buffer done playing" messages */ |
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112 if (uMsg != WOM_DONE) |
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113 return; |
| 0 | 114 |
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115 /* Signal that we are done playing a buffer */ |
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116 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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117 ReleaseSemaphoreCE (audio_sem, 1, NULL); |
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118 #else |
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119 ReleaseSemaphore (audio_sem, 1, NULL); |
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120 #endif |
| 0 | 121 } |
| 122 | |
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123 static void |
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124 SetMMerror (char *function, MMRESULT code) |
| 0 | 125 { |
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126 size_t len; |
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127 char errbuf[MAXERRORLENGTH]; |
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128 #ifdef _WIN32_WCE |
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129 wchar_t werrbuf[MAXERRORLENGTH]; |
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130 #endif |
| 0 | 131 |
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132 SDL_snprintf (errbuf, SDL_arraysize (errbuf), "%s: ", function); |
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133 len = SDL_strlen (errbuf); |
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134 |
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135 #ifdef _WIN32_WCE |
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136 /* UNICODE version */ |
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137 waveOutGetErrorText (code, werrbuf, MAXERRORLENGTH - len); |
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138 WideCharToMultiByte (CP_ACP, 0, werrbuf, -1, errbuf + len, |
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139 MAXERRORLENGTH - len, NULL, NULL); |
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140 #else |
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141 waveOutGetErrorText (code, errbuf + len, (UINT) (MAXERRORLENGTH - len)); |
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142 #endif |
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143 |
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144 SDL_SetError ("%s", errbuf); |
| 0 | 145 } |
| 146 | |
| 147 /* Set high priority for the audio thread */ | |
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148 static void |
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149 DIB_ThreadInit (_THIS) |
| 0 | 150 { |
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151 SetThreadPriority (GetCurrentThread (), THREAD_PRIORITY_HIGHEST); |
| 0 | 152 } |
| 153 | |
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154 void |
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155 DIB_WaitAudio (_THIS) |
| 0 | 156 { |
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157 /* Wait for an audio chunk to finish */ |
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158 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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159 WaitForSemaphoreCE (audio_sem, INFINITE); |
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160 #else |
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161 WaitForSingleObject (audio_sem, INFINITE); |
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162 #endif |
| 0 | 163 } |
| 164 | |
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165 Uint8 * |
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166 DIB_GetAudioBuf (_THIS) |
| 0 | 167 { |
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168 Uint8 *retval; |
| 0 | 169 |
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170 retval = (Uint8 *) (wavebuf[next_buffer].lpData); |
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171 return retval; |
| 0 | 172 } |
| 173 | |
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174 void |
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175 DIB_PlayAudio (_THIS) |
| 0 | 176 { |
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177 /* Queue it up */ |
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178 waveOutWrite (sound, &wavebuf[next_buffer], sizeof (wavebuf[0])); |
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179 next_buffer = (next_buffer + 1) % NUM_BUFFERS; |
| 0 | 180 } |
| 181 | |
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182 void |
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183 DIB_WaitDone (_THIS) |
| 0 | 184 { |
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185 int i, left; |
| 0 | 186 |
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187 do { |
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188 left = NUM_BUFFERS; |
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189 for (i = 0; i < NUM_BUFFERS; ++i) { |
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190 if (wavebuf[i].dwFlags & WHDR_DONE) { |
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191 --left; |
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192 } |
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193 } |
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194 if (left > 0) { |
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195 SDL_Delay (100); |
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196 } |
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197 } |
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198 while (left > 0); |
| 0 | 199 } |
| 200 | |
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201 void |
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202 DIB_CloseAudio (_THIS) |
| 0 | 203 { |
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204 int i; |
| 0 | 205 |
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206 /* Close up audio */ |
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207 if (audio_sem) { |
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208 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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209 CloseSynchHandle (audio_sem); |
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210 #else |
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211 CloseHandle (audio_sem); |
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212 #endif |
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213 } |
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214 if (sound) { |
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215 waveOutClose (sound); |
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216 } |
| 0 | 217 |
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218 /* Clean up mixing buffers */ |
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219 for (i = 0; i < NUM_BUFFERS; ++i) { |
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220 if (wavebuf[i].dwUser != 0xFFFF) { |
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221 waveOutUnprepareHeader (sound, &wavebuf[i], sizeof (wavebuf[i])); |
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222 wavebuf[i].dwUser = 0xFFFF; |
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223 } |
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224 } |
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225 /* Free raw mixing buffer */ |
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226 if (mixbuf != NULL) { |
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227 SDL_free (mixbuf); |
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228 mixbuf = NULL; |
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229 } |
| 0 | 230 } |
| 231 | |
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232 int |
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233 DIB_OpenAudio (_THIS, SDL_AudioSpec * spec) |
| 0 | 234 { |
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235 MMRESULT result; |
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236 int i; |
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237 WAVEFORMATEX waveformat; |
| 0 | 238 |
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239 /* Initialize the wavebuf structures for closing */ |
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240 sound = NULL; |
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241 audio_sem = NULL; |
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242 for (i = 0; i < NUM_BUFFERS; ++i) |
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243 wavebuf[i].dwUser = 0xFFFF; |
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244 mixbuf = NULL; |
| 0 | 245 |
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246 /* Set basic WAVE format parameters */ |
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247 SDL_memset (&waveformat, 0, sizeof (waveformat)); |
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248 waveformat.wFormatTag = WAVE_FORMAT_PCM; |
| 0 | 249 |
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250 /* Determine the audio parameters from the AudioSpec */ |
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251 switch (spec->format & 0xFF) { |
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252 case 8: |
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253 /* Unsigned 8 bit audio data */ |
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254 spec->format = AUDIO_U8; |
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255 waveformat.wBitsPerSample = 8; |
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256 break; |
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257 case 16: |
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258 /* Signed 16 bit audio data */ |
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259 spec->format = AUDIO_S16; |
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260 waveformat.wBitsPerSample = 16; |
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261 break; |
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262 default: |
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263 SDL_SetError ("Unsupported audio format"); |
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264 return (-1); |
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265 } |
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266 waveformat.nChannels = spec->channels; |
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267 waveformat.nSamplesPerSec = spec->freq; |
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268 waveformat.nBlockAlign = |
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269 waveformat.nChannels * (waveformat.wBitsPerSample / 8); |
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270 waveformat.nAvgBytesPerSec = |
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271 waveformat.nSamplesPerSec * waveformat.nBlockAlign; |
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273 /* Check the buffer size -- minimum of 1/4 second (word aligned) */ |
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274 if (spec->samples < (spec->freq / 4)) |
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275 spec->samples = ((spec->freq / 4) + 3) & ~3; |
| 0 | 276 |
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277 /* Update the fragment size as size in bytes */ |
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278 SDL_CalculateAudioSpec (spec); |
| 0 | 279 |
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280 /* Open the audio device */ |
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281 result = waveOutOpen (&sound, WAVE_MAPPER, &waveformat, |
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282 (DWORD_PTR) FillSound, (DWORD_PTR) this, |
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283 CALLBACK_FUNCTION); |
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284 if (result != MMSYSERR_NOERROR) { |
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285 SetMMerror ("waveOutOpen()", result); |
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286 return (-1); |
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287 } |
| 0 | 288 #ifdef SOUND_DEBUG |
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289 /* Check the sound device we retrieved */ |
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290 { |
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291 WAVEOUTCAPS caps; |
| 0 | 292 |
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293 result = waveOutGetDevCaps ((UINT) sound, &caps, sizeof (caps)); |
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294 if (result != MMSYSERR_NOERROR) { |
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295 SetMMerror ("waveOutGetDevCaps()", result); |
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296 return (-1); |
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297 } |
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298 printf ("Audio device: %s\n", caps.szPname); |
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299 } |
| 0 | 300 #endif |
| 301 | |
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302 /* Create the audio buffer semaphore */ |
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303 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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304 audio_sem = CreateSemaphoreCE (NULL, NUM_BUFFERS - 1, NUM_BUFFERS, NULL); |
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305 #else |
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306 audio_sem = CreateSemaphore (NULL, NUM_BUFFERS - 1, NUM_BUFFERS, NULL); |
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307 #endif |
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308 if (audio_sem == NULL) { |
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309 SDL_SetError ("Couldn't create semaphore"); |
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310 return (-1); |
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311 } |
| 0 | 312 |
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313 /* Create the sound buffers */ |
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314 mixbuf = (Uint8 *) SDL_malloc (NUM_BUFFERS * spec->size); |
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315 if (mixbuf == NULL) { |
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316 SDL_SetError ("Out of memory"); |
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317 return (-1); |
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318 } |
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319 for (i = 0; i < NUM_BUFFERS; ++i) { |
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320 SDL_memset (&wavebuf[i], 0, sizeof (wavebuf[i])); |
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321 wavebuf[i].lpData = (LPSTR) & mixbuf[i * spec->size]; |
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322 wavebuf[i].dwBufferLength = spec->size; |
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323 wavebuf[i].dwFlags = WHDR_DONE; |
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324 result = waveOutPrepareHeader (sound, &wavebuf[i], |
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325 sizeof (wavebuf[i])); |
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326 if (result != MMSYSERR_NOERROR) { |
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327 SetMMerror ("waveOutPrepareHeader()", result); |
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328 return (-1); |
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329 } |
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330 } |
| 0 | 331 |
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332 /* Ready to go! */ |
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333 next_buffer = 0; |
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334 return (0); |
| 0 | 335 } |
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336 |
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337 /* vi: set ts=4 sw=4 expandtab: */ |