Mercurial > sdl-ios-xcode
annotate src/audio/windib/SDL_dibaudio.c @ 626:b98f732b4322
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 29 May 2003 04:23:03 +0000 |
| parents | f6ffac90895c |
| children | b8d311d90021 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 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 | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* Allow access to a raw mixing buffer */ | |
| 29 | |
| 30 #include <stdio.h> | |
| 31 #include <stdlib.h> | |
| 32 #include <windows.h> | |
| 33 #include <mmsystem.h> | |
| 34 | |
| 35 #include "SDL_audio.h" | |
| 36 #include "SDL_mutex.h" | |
| 37 #include "SDL_timer.h" | |
| 38 #include "SDL_audio_c.h" | |
| 39 #include "SDL_dibaudio.h" | |
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40 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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41 #include "win_ce_semaphore.h" |
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42 #endif |
| 0 | 43 |
| 44 | |
| 45 /* Audio driver functions */ | |
| 46 static int DIB_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 47 static void DIB_ThreadInit(_THIS); | |
| 48 static void DIB_WaitAudio(_THIS); | |
| 49 static Uint8 *DIB_GetAudioBuf(_THIS); | |
| 50 static void DIB_PlayAudio(_THIS); | |
| 51 static void DIB_WaitDone(_THIS); | |
| 52 static void DIB_CloseAudio(_THIS); | |
| 53 | |
| 54 /* Audio driver bootstrap functions */ | |
| 55 | |
| 56 static int Audio_Available(void) | |
| 57 { | |
| 58 return(1); | |
| 59 } | |
| 60 | |
| 61 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 62 { | |
| 63 free(device->hidden); | |
| 64 free(device); | |
| 65 } | |
| 66 | |
| 67 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 68 { | |
| 69 SDL_AudioDevice *this; | |
| 70 | |
| 71 /* Initialize all variables that we clean on shutdown */ | |
| 72 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); | |
| 73 if ( this ) { | |
| 74 memset(this, 0, (sizeof *this)); | |
| 75 this->hidden = (struct SDL_PrivateAudioData *) | |
| 76 malloc((sizeof *this->hidden)); | |
| 77 } | |
| 78 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 79 SDL_OutOfMemory(); | |
| 80 if ( this ) { | |
| 81 free(this); | |
| 82 } | |
| 83 return(0); | |
| 84 } | |
| 85 memset(this->hidden, 0, (sizeof *this->hidden)); | |
| 86 | |
| 87 /* Set the function pointers */ | |
| 88 this->OpenAudio = DIB_OpenAudio; | |
| 89 this->ThreadInit = DIB_ThreadInit; | |
| 90 this->WaitAudio = DIB_WaitAudio; | |
| 91 this->PlayAudio = DIB_PlayAudio; | |
| 92 this->GetAudioBuf = DIB_GetAudioBuf; | |
| 93 this->WaitDone = DIB_WaitDone; | |
| 94 this->CloseAudio = DIB_CloseAudio; | |
| 95 | |
| 96 this->free = Audio_DeleteDevice; | |
| 97 | |
| 98 return this; | |
| 99 } | |
| 100 | |
| 101 AudioBootStrap WAVEOUT_bootstrap = { | |
| 102 "waveout", "Win95/98/NT/2000 WaveOut", | |
| 103 Audio_Available, Audio_CreateDevice | |
| 104 }; | |
| 105 | |
| 106 | |
| 107 /* The Win32 callback for filling the WAVE device */ | |
| 108 static void CALLBACK FillSound(HWAVEOUT hwo, UINT uMsg, DWORD dwInstance, | |
| 109 DWORD dwParam1, DWORD dwParam2) | |
| 110 { | |
| 111 SDL_AudioDevice *this = (SDL_AudioDevice *)dwInstance; | |
| 112 | |
| 113 /* Only service "buffer done playing" messages */ | |
| 114 if ( uMsg != WOM_DONE ) | |
| 115 return; | |
| 116 | |
| 117 /* Signal that we are done playing a buffer */ | |
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118 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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119 ReleaseSemaphoreCE(audio_sem, 1, NULL); |
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120 #else |
| 0 | 121 ReleaseSemaphore(audio_sem, 1, NULL); |
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122 #endif |
| 0 | 123 } |
| 124 | |
| 125 static void SetMMerror(char *function, MMRESULT code) | |
| 126 { | |
| 127 int len; | |
| 128 char errbuf[MAXERRORLENGTH]; | |
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129 #ifdef _WIN32_WCE |
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130 wchar_t werrbuf[MAXERRORLENGTH]; |
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131 #endif |
| 0 | 132 |
| 133 sprintf(errbuf, "%s: ", function); | |
| 134 len = strlen(errbuf); | |
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135 |
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136 #ifdef _WIN32_WCE |
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137 /* UNICODE version */ |
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138 waveOutGetErrorText(code, werrbuf, MAXERRORLENGTH-len); |
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139 WideCharToMultiByte(CP_ACP,0,werrbuf,-1,errbuf+len,MAXERRORLENGTH-len,NULL,NULL); |
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140 #else |
| 0 | 141 waveOutGetErrorText(code, errbuf+len, 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 */ | |
| 148 static void DIB_ThreadInit(_THIS) | |
| 149 { | |
| 150 SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST); | |
| 151 } | |
| 152 | |
| 153 void DIB_WaitAudio(_THIS) | |
| 154 { | |
| 155 /* Wait for an audio chunk to finish */ | |
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156 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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157 WaitForSemaphoreCE(audio_sem, INFINITE); |
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158 #else |
| 0 | 159 WaitForSingleObject(audio_sem, INFINITE); |
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160 #endif |
| 0 | 161 } |
| 162 | |
| 163 Uint8 *DIB_GetAudioBuf(_THIS) | |
| 164 { | |
| 165 Uint8 *retval; | |
| 166 | |
| 167 retval = (Uint8 *)(wavebuf[next_buffer].lpData); | |
| 168 return retval; | |
| 169 } | |
| 170 | |
| 171 void DIB_PlayAudio(_THIS) | |
| 172 { | |
| 173 /* Queue it up */ | |
| 174 waveOutWrite(sound, &wavebuf[next_buffer], sizeof(wavebuf[0])); | |
| 175 next_buffer = (next_buffer+1)%NUM_BUFFERS; | |
| 176 } | |
| 177 | |
| 178 void DIB_WaitDone(_THIS) | |
| 179 { | |
| 180 int i, left; | |
| 181 | |
| 182 do { | |
| 183 left = NUM_BUFFERS; | |
| 184 for ( i=0; i<NUM_BUFFERS; ++i ) { | |
| 185 if ( wavebuf[i].dwFlags & WHDR_DONE ) { | |
| 186 --left; | |
| 187 } | |
| 188 } | |
| 189 if ( left > 0 ) { | |
| 190 SDL_Delay(100); | |
| 191 } | |
| 192 } while ( left > 0 ); | |
| 193 } | |
| 194 | |
| 195 void DIB_CloseAudio(_THIS) | |
| 196 { | |
| 197 int i; | |
| 198 | |
| 199 /* Close up audio */ | |
| 200 if ( audio_sem ) { | |
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201 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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202 CloseSynchHandle(audio_sem); |
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203 #else |
| 0 | 204 CloseHandle(audio_sem); |
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205 #endif |
| 0 | 206 } |
| 207 if ( sound ) { | |
| 208 waveOutClose(sound); | |
| 209 } | |
| 210 | |
| 211 /* Clean up mixing buffers */ | |
| 212 for ( i=0; i<NUM_BUFFERS; ++i ) { | |
| 213 if ( wavebuf[i].dwUser != 0xFFFF ) { | |
| 214 waveOutUnprepareHeader(sound, &wavebuf[i], | |
| 215 sizeof(wavebuf[i])); | |
| 216 wavebuf[i].dwUser = 0xFFFF; | |
| 217 } | |
| 218 } | |
| 219 /* Free raw mixing buffer */ | |
| 220 if ( mixbuf != NULL ) { | |
| 221 free(mixbuf); | |
| 222 mixbuf = NULL; | |
| 223 } | |
| 224 } | |
| 225 | |
| 226 int DIB_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 227 { | |
| 228 MMRESULT result; | |
| 229 int i; | |
| 230 WAVEFORMATEX waveformat; | |
| 231 | |
| 232 /* Initialize the wavebuf structures for closing */ | |
| 233 sound = NULL; | |
| 234 audio_sem = NULL; | |
| 235 for ( i = 0; i < NUM_BUFFERS; ++i ) | |
| 236 wavebuf[i].dwUser = 0xFFFF; | |
| 237 mixbuf = NULL; | |
| 238 | |
| 239 /* Set basic WAVE format parameters */ | |
| 240 memset(&waveformat, 0, sizeof(waveformat)); | |
| 241 waveformat.wFormatTag = WAVE_FORMAT_PCM; | |
| 242 | |
| 243 /* Determine the audio parameters from the AudioSpec */ | |
| 244 switch ( spec->format & 0xFF ) { | |
| 245 case 8: | |
| 246 /* Unsigned 8 bit audio data */ | |
| 247 spec->format = AUDIO_U8; | |
| 248 waveformat.wBitsPerSample = 8; | |
| 249 break; | |
| 250 case 16: | |
| 251 /* Signed 16 bit audio data */ | |
| 252 spec->format = AUDIO_S16; | |
| 253 waveformat.wBitsPerSample = 16; | |
| 254 break; | |
| 255 default: | |
| 256 SDL_SetError("Unsupported audio format"); | |
| 257 return(-1); | |
| 258 } | |
| 259 waveformat.nChannels = spec->channels; | |
| 260 waveformat.nSamplesPerSec = spec->freq; | |
| 261 waveformat.nBlockAlign = | |
| 262 waveformat.nChannels * (waveformat.wBitsPerSample/8); | |
| 263 waveformat.nAvgBytesPerSec = | |
| 264 waveformat.nSamplesPerSec * waveformat.nBlockAlign; | |
| 265 | |
| 266 /* Check the buffer size -- minimum of 1/4 second (word aligned) */ | |
| 267 if ( spec->samples < (spec->freq/4) ) | |
| 268 spec->samples = ((spec->freq/4)+3)&~3; | |
| 269 | |
| 270 /* Update the fragment size as size in bytes */ | |
| 271 SDL_CalculateAudioSpec(spec); | |
| 272 | |
| 273 /* Open the audio device */ | |
| 274 result = waveOutOpen(&sound, WAVE_MAPPER, &waveformat, | |
| 275 (DWORD)FillSound, (DWORD)this, CALLBACK_FUNCTION); | |
| 276 if ( result != MMSYSERR_NOERROR ) { | |
| 277 SetMMerror("waveOutOpen()", result); | |
| 278 return(-1); | |
| 279 } | |
| 280 | |
| 281 #ifdef SOUND_DEBUG | |
| 282 /* Check the sound device we retrieved */ | |
| 283 { | |
| 284 WAVEOUTCAPS caps; | |
| 285 | |
| 286 result = waveOutGetDevCaps((UINT)sound, &caps, sizeof(caps)); | |
| 287 if ( result != MMSYSERR_NOERROR ) { | |
| 288 SetMMerror("waveOutGetDevCaps()", result); | |
| 289 return(-1); | |
| 290 } | |
| 291 printf("Audio device: %s\n", caps.szPname); | |
| 292 } | |
| 293 #endif | |
| 294 | |
| 295 /* Create the audio buffer semaphore */ | |
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296 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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297 audio_sem = CreateSemaphoreCE(NULL, NUM_BUFFERS-1, NUM_BUFFERS, NULL); |
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298 #else |
| 0 | 299 audio_sem = CreateSemaphore(NULL, NUM_BUFFERS-1, NUM_BUFFERS, NULL); |
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300 #endif |
| 0 | 301 if ( audio_sem == NULL ) { |
| 302 SDL_SetError("Couldn't create semaphore"); | |
| 303 return(-1); | |
| 304 } | |
| 305 | |
| 306 /* Create the sound buffers */ | |
| 307 mixbuf = (Uint8 *)malloc(NUM_BUFFERS*spec->size); | |
| 308 if ( mixbuf == NULL ) { | |
| 309 SDL_SetError("Out of memory"); | |
| 310 return(-1); | |
| 311 } | |
| 312 for ( i = 0; i < NUM_BUFFERS; ++i ) { | |
| 313 memset(&wavebuf[i], 0, sizeof(wavebuf[i])); | |
| 314 wavebuf[i].lpData = (LPSTR) &mixbuf[i*spec->size]; | |
| 315 wavebuf[i].dwBufferLength = spec->size; | |
| 316 wavebuf[i].dwFlags = WHDR_DONE; | |
| 317 result = waveOutPrepareHeader(sound, &wavebuf[i], | |
| 318 sizeof(wavebuf[i])); | |
| 319 if ( result != MMSYSERR_NOERROR ) { | |
| 320 SetMMerror("waveOutPrepareHeader()", result); | |
| 321 return(-1); | |
| 322 } | |
| 323 } | |
| 324 | |
| 325 /* Ready to go! */ | |
| 326 next_buffer = 0; | |
| 327 return(0); | |
| 328 } |