Mercurial > sdl-ios-xcode
annotate src/audio/windib/SDL_dibaudio.c @ 1358:c71e05b4dc2e
More header massaging... works great on Windows. ;-)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 10 Feb 2006 06:48:43 +0000 |
| parents | 604d73db6802 |
| children | 19418e4422cb |
| 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 */ |
| 22 | |
| 23 /* Allow access to a raw mixing buffer */ | |
| 24 | |
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25 #include "SDL_windows.h" |
| 0 | 26 #include <mmsystem.h> |
| 27 | |
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28 #include "SDL_timer.h" |
| 0 | 29 #include "SDL_audio.h" |
| 30 #include "SDL_audio_c.h" | |
| 31 #include "SDL_dibaudio.h" | |
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32 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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33 #include "win_ce_semaphore.h" |
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34 #endif |
| 0 | 35 |
| 36 | |
| 37 /* Audio driver functions */ | |
| 38 static int DIB_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 39 static void DIB_ThreadInit(_THIS); | |
| 40 static void DIB_WaitAudio(_THIS); | |
| 41 static Uint8 *DIB_GetAudioBuf(_THIS); | |
| 42 static void DIB_PlayAudio(_THIS); | |
| 43 static void DIB_WaitDone(_THIS); | |
| 44 static void DIB_CloseAudio(_THIS); | |
| 45 | |
| 46 /* Audio driver bootstrap functions */ | |
| 47 | |
| 48 static int Audio_Available(void) | |
| 49 { | |
| 50 return(1); | |
| 51 } | |
| 52 | |
| 53 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 54 { | |
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55 SDL_free(device->hidden); |
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56 SDL_free(device); |
| 0 | 57 } |
| 58 | |
| 59 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 60 { | |
| 61 SDL_AudioDevice *this; | |
| 62 | |
| 63 /* Initialize all variables that we clean on shutdown */ | |
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64 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
| 0 | 65 if ( this ) { |
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66 SDL_memset(this, 0, (sizeof *this)); |
| 0 | 67 this->hidden = (struct SDL_PrivateAudioData *) |
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68 SDL_malloc((sizeof *this->hidden)); |
| 0 | 69 } |
| 70 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 71 SDL_OutOfMemory(); | |
| 72 if ( this ) { | |
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73 SDL_free(this); |
| 0 | 74 } |
| 75 return(0); | |
| 76 } | |
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77 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| 0 | 78 |
| 79 /* Set the function pointers */ | |
| 80 this->OpenAudio = DIB_OpenAudio; | |
| 81 this->ThreadInit = DIB_ThreadInit; | |
| 82 this->WaitAudio = DIB_WaitAudio; | |
| 83 this->PlayAudio = DIB_PlayAudio; | |
| 84 this->GetAudioBuf = DIB_GetAudioBuf; | |
| 85 this->WaitDone = DIB_WaitDone; | |
| 86 this->CloseAudio = DIB_CloseAudio; | |
| 87 | |
| 88 this->free = Audio_DeleteDevice; | |
| 89 | |
| 90 return this; | |
| 91 } | |
| 92 | |
| 93 AudioBootStrap WAVEOUT_bootstrap = { | |
| 94 "waveout", "Win95/98/NT/2000 WaveOut", | |
| 95 Audio_Available, Audio_CreateDevice | |
| 96 }; | |
| 97 | |
| 98 | |
| 99 /* The Win32 callback for filling the WAVE device */ | |
| 100 static void CALLBACK FillSound(HWAVEOUT hwo, UINT uMsg, DWORD dwInstance, | |
| 101 DWORD dwParam1, DWORD dwParam2) | |
| 102 { | |
| 103 SDL_AudioDevice *this = (SDL_AudioDevice *)dwInstance; | |
| 104 | |
| 105 /* Only service "buffer done playing" messages */ | |
| 106 if ( uMsg != WOM_DONE ) | |
| 107 return; | |
| 108 | |
| 109 /* Signal that we are done playing a buffer */ | |
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110 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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111 ReleaseSemaphoreCE(audio_sem, 1, NULL); |
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112 #else |
| 0 | 113 ReleaseSemaphore(audio_sem, 1, NULL); |
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114 #endif |
| 0 | 115 } |
| 116 | |
| 117 static void SetMMerror(char *function, MMRESULT code) | |
| 118 { | |
| 119 int len; | |
| 120 char errbuf[MAXERRORLENGTH]; | |
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121 #ifdef _WIN32_WCE |
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122 wchar_t werrbuf[MAXERRORLENGTH]; |
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123 #endif |
| 0 | 124 |
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125 SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function); |
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126 len = SDL_strlen(errbuf); |
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127 |
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128 #ifdef _WIN32_WCE |
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129 /* UNICODE version */ |
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130 waveOutGetErrorText(code, werrbuf, MAXERRORLENGTH-len); |
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131 WideCharToMultiByte(CP_ACP,0,werrbuf,-1,errbuf+len,MAXERRORLENGTH-len,NULL,NULL); |
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132 #else |
| 0 | 133 waveOutGetErrorText(code, errbuf+len, MAXERRORLENGTH-len); |
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134 #endif |
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135 |
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136 SDL_SetError("%s",errbuf); |
| 0 | 137 } |
| 138 | |
| 139 /* Set high priority for the audio thread */ | |
| 140 static void DIB_ThreadInit(_THIS) | |
| 141 { | |
| 142 SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST); | |
| 143 } | |
| 144 | |
| 145 void DIB_WaitAudio(_THIS) | |
| 146 { | |
| 147 /* Wait for an audio chunk to finish */ | |
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148 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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149 WaitForSemaphoreCE(audio_sem, INFINITE); |
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150 #else |
| 0 | 151 WaitForSingleObject(audio_sem, INFINITE); |
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152 #endif |
| 0 | 153 } |
| 154 | |
| 155 Uint8 *DIB_GetAudioBuf(_THIS) | |
| 156 { | |
| 157 Uint8 *retval; | |
| 158 | |
| 159 retval = (Uint8 *)(wavebuf[next_buffer].lpData); | |
| 160 return retval; | |
| 161 } | |
| 162 | |
| 163 void DIB_PlayAudio(_THIS) | |
| 164 { | |
| 165 /* Queue it up */ | |
| 166 waveOutWrite(sound, &wavebuf[next_buffer], sizeof(wavebuf[0])); | |
| 167 next_buffer = (next_buffer+1)%NUM_BUFFERS; | |
| 168 } | |
| 169 | |
| 170 void DIB_WaitDone(_THIS) | |
| 171 { | |
| 172 int i, left; | |
| 173 | |
| 174 do { | |
| 175 left = NUM_BUFFERS; | |
| 176 for ( i=0; i<NUM_BUFFERS; ++i ) { | |
| 177 if ( wavebuf[i].dwFlags & WHDR_DONE ) { | |
| 178 --left; | |
| 179 } | |
| 180 } | |
| 181 if ( left > 0 ) { | |
| 182 SDL_Delay(100); | |
| 183 } | |
| 184 } while ( left > 0 ); | |
| 185 } | |
| 186 | |
| 187 void DIB_CloseAudio(_THIS) | |
| 188 { | |
| 189 int i; | |
| 190 | |
| 191 /* Close up audio */ | |
| 192 if ( audio_sem ) { | |
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193 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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194 CloseSynchHandle(audio_sem); |
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195 #else |
| 0 | 196 CloseHandle(audio_sem); |
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197 #endif |
| 0 | 198 } |
| 199 if ( sound ) { | |
| 200 waveOutClose(sound); | |
| 201 } | |
| 202 | |
| 203 /* Clean up mixing buffers */ | |
| 204 for ( i=0; i<NUM_BUFFERS; ++i ) { | |
| 205 if ( wavebuf[i].dwUser != 0xFFFF ) { | |
| 206 waveOutUnprepareHeader(sound, &wavebuf[i], | |
| 207 sizeof(wavebuf[i])); | |
| 208 wavebuf[i].dwUser = 0xFFFF; | |
| 209 } | |
| 210 } | |
| 211 /* Free raw mixing buffer */ | |
| 212 if ( mixbuf != NULL ) { | |
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213 SDL_free(mixbuf); |
| 0 | 214 mixbuf = NULL; |
| 215 } | |
| 216 } | |
| 217 | |
| 218 int DIB_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 219 { | |
| 220 MMRESULT result; | |
| 221 int i; | |
| 222 WAVEFORMATEX waveformat; | |
| 223 | |
| 224 /* Initialize the wavebuf structures for closing */ | |
| 225 sound = NULL; | |
| 226 audio_sem = NULL; | |
| 227 for ( i = 0; i < NUM_BUFFERS; ++i ) | |
| 228 wavebuf[i].dwUser = 0xFFFF; | |
| 229 mixbuf = NULL; | |
| 230 | |
| 231 /* Set basic WAVE format parameters */ | |
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232 SDL_memset(&waveformat, 0, sizeof(waveformat)); |
| 0 | 233 waveformat.wFormatTag = WAVE_FORMAT_PCM; |
| 234 | |
| 235 /* Determine the audio parameters from the AudioSpec */ | |
| 236 switch ( spec->format & 0xFF ) { | |
| 237 case 8: | |
| 238 /* Unsigned 8 bit audio data */ | |
| 239 spec->format = AUDIO_U8; | |
| 240 waveformat.wBitsPerSample = 8; | |
| 241 break; | |
| 242 case 16: | |
| 243 /* Signed 16 bit audio data */ | |
| 244 spec->format = AUDIO_S16; | |
| 245 waveformat.wBitsPerSample = 16; | |
| 246 break; | |
| 247 default: | |
| 248 SDL_SetError("Unsupported audio format"); | |
| 249 return(-1); | |
| 250 } | |
| 251 waveformat.nChannels = spec->channels; | |
| 252 waveformat.nSamplesPerSec = spec->freq; | |
| 253 waveformat.nBlockAlign = | |
| 254 waveformat.nChannels * (waveformat.wBitsPerSample/8); | |
| 255 waveformat.nAvgBytesPerSec = | |
| 256 waveformat.nSamplesPerSec * waveformat.nBlockAlign; | |
| 257 | |
| 258 /* Check the buffer size -- minimum of 1/4 second (word aligned) */ | |
| 259 if ( spec->samples < (spec->freq/4) ) | |
| 260 spec->samples = ((spec->freq/4)+3)&~3; | |
| 261 | |
| 262 /* Update the fragment size as size in bytes */ | |
| 263 SDL_CalculateAudioSpec(spec); | |
| 264 | |
| 265 /* Open the audio device */ | |
| 266 result = waveOutOpen(&sound, WAVE_MAPPER, &waveformat, | |
| 267 (DWORD)FillSound, (DWORD)this, CALLBACK_FUNCTION); | |
| 268 if ( result != MMSYSERR_NOERROR ) { | |
| 269 SetMMerror("waveOutOpen()", result); | |
| 270 return(-1); | |
| 271 } | |
| 272 | |
| 273 #ifdef SOUND_DEBUG | |
| 274 /* Check the sound device we retrieved */ | |
| 275 { | |
| 276 WAVEOUTCAPS caps; | |
| 277 | |
| 278 result = waveOutGetDevCaps((UINT)sound, &caps, sizeof(caps)); | |
| 279 if ( result != MMSYSERR_NOERROR ) { | |
| 280 SetMMerror("waveOutGetDevCaps()", result); | |
| 281 return(-1); | |
| 282 } | |
| 283 printf("Audio device: %s\n", caps.szPname); | |
| 284 } | |
| 285 #endif | |
| 286 | |
| 287 /* Create the audio buffer semaphore */ | |
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288 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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289 audio_sem = CreateSemaphoreCE(NULL, NUM_BUFFERS-1, NUM_BUFFERS, NULL); |
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290 #else |
| 0 | 291 audio_sem = CreateSemaphore(NULL, NUM_BUFFERS-1, NUM_BUFFERS, NULL); |
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292 #endif |
| 0 | 293 if ( audio_sem == NULL ) { |
| 294 SDL_SetError("Couldn't create semaphore"); | |
| 295 return(-1); | |
| 296 } | |
| 297 | |
| 298 /* Create the sound buffers */ | |
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299 mixbuf = (Uint8 *)SDL_malloc(NUM_BUFFERS*spec->size); |
| 0 | 300 if ( mixbuf == NULL ) { |
| 301 SDL_SetError("Out of memory"); | |
| 302 return(-1); | |
| 303 } | |
| 304 for ( i = 0; i < NUM_BUFFERS; ++i ) { | |
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305 SDL_memset(&wavebuf[i], 0, sizeof(wavebuf[i])); |
| 0 | 306 wavebuf[i].lpData = (LPSTR) &mixbuf[i*spec->size]; |
| 307 wavebuf[i].dwBufferLength = spec->size; | |
| 308 wavebuf[i].dwFlags = WHDR_DONE; | |
| 309 result = waveOutPrepareHeader(sound, &wavebuf[i], | |
| 310 sizeof(wavebuf[i])); | |
| 311 if ( result != MMSYSERR_NOERROR ) { | |
| 312 SetMMerror("waveOutPrepareHeader()", result); | |
| 313 return(-1); | |
| 314 } | |
| 315 } | |
| 316 | |
| 317 /* Ready to go! */ | |
| 318 next_buffer = 0; | |
| 319 return(0); | |
| 320 } |