Mercurial > sdl-ios-xcode
annotate src/audio/windib/SDL_dibaudio.c @ 1330:450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
using Visual C++ 2005
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 06 Feb 2006 08:28:51 +0000 |
| parents | c9b51268668f |
| children | 3692456e7b0f |
| 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 | |
| 28 #include "SDL_audio.h" | |
| 29 #include "SDL_mutex.h" | |
| 30 #include "SDL_timer.h" | |
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It's now possible to build SDL without any C runtime at all on Windows,
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parents:
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31 #include "SDL_stdlib.h" |
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It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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32 #include "SDL_string.h" |
| 0 | 33 #include "SDL_audio_c.h" |
| 34 #include "SDL_dibaudio.h" | |
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35 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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36 #include "win_ce_semaphore.h" |
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37 #endif |
| 0 | 38 |
| 39 | |
| 40 /* Audio driver functions */ | |
| 41 static int DIB_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 42 static void DIB_ThreadInit(_THIS); | |
| 43 static void DIB_WaitAudio(_THIS); | |
| 44 static Uint8 *DIB_GetAudioBuf(_THIS); | |
| 45 static void DIB_PlayAudio(_THIS); | |
| 46 static void DIB_WaitDone(_THIS); | |
| 47 static void DIB_CloseAudio(_THIS); | |
| 48 | |
| 49 /* Audio driver bootstrap functions */ | |
| 50 | |
| 51 static int Audio_Available(void) | |
| 52 { | |
| 53 return(1); | |
| 54 } | |
| 55 | |
| 56 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 57 { | |
| 58 free(device->hidden); | |
| 59 free(device); | |
| 60 } | |
| 61 | |
| 62 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 63 { | |
| 64 SDL_AudioDevice *this; | |
| 65 | |
| 66 /* Initialize all variables that we clean on shutdown */ | |
| 67 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); | |
| 68 if ( this ) { | |
| 69 memset(this, 0, (sizeof *this)); | |
| 70 this->hidden = (struct SDL_PrivateAudioData *) | |
| 71 malloc((sizeof *this->hidden)); | |
| 72 } | |
| 73 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 74 SDL_OutOfMemory(); | |
| 75 if ( this ) { | |
| 76 free(this); | |
| 77 } | |
| 78 return(0); | |
| 79 } | |
| 80 memset(this->hidden, 0, (sizeof *this->hidden)); | |
| 81 | |
| 82 /* Set the function pointers */ | |
| 83 this->OpenAudio = DIB_OpenAudio; | |
| 84 this->ThreadInit = DIB_ThreadInit; | |
| 85 this->WaitAudio = DIB_WaitAudio; | |
| 86 this->PlayAudio = DIB_PlayAudio; | |
| 87 this->GetAudioBuf = DIB_GetAudioBuf; | |
| 88 this->WaitDone = DIB_WaitDone; | |
| 89 this->CloseAudio = DIB_CloseAudio; | |
| 90 | |
| 91 this->free = Audio_DeleteDevice; | |
| 92 | |
| 93 return this; | |
| 94 } | |
| 95 | |
| 96 AudioBootStrap WAVEOUT_bootstrap = { | |
| 97 "waveout", "Win95/98/NT/2000 WaveOut", | |
| 98 Audio_Available, Audio_CreateDevice | |
| 99 }; | |
| 100 | |
| 101 | |
| 102 /* The Win32 callback for filling the WAVE device */ | |
| 103 static void CALLBACK FillSound(HWAVEOUT hwo, UINT uMsg, DWORD dwInstance, | |
| 104 DWORD dwParam1, DWORD dwParam2) | |
| 105 { | |
| 106 SDL_AudioDevice *this = (SDL_AudioDevice *)dwInstance; | |
| 107 | |
| 108 /* Only service "buffer done playing" messages */ | |
| 109 if ( uMsg != WOM_DONE ) | |
| 110 return; | |
| 111 | |
| 112 /* Signal that we are done playing a buffer */ | |
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113 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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114 ReleaseSemaphoreCE(audio_sem, 1, NULL); |
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115 #else |
| 0 | 116 ReleaseSemaphore(audio_sem, 1, NULL); |
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117 #endif |
| 0 | 118 } |
| 119 | |
| 120 static void SetMMerror(char *function, MMRESULT code) | |
| 121 { | |
| 122 int len; | |
| 123 char errbuf[MAXERRORLENGTH]; | |
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124 #ifdef _WIN32_WCE |
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125 wchar_t werrbuf[MAXERRORLENGTH]; |
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126 #endif |
| 0 | 127 |
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It's now possible to build SDL without any C runtime at all on Windows,
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128 snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function); |
| 0 | 129 len = strlen(errbuf); |
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130 |
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131 #ifdef _WIN32_WCE |
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132 /* UNICODE version */ |
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133 waveOutGetErrorText(code, werrbuf, MAXERRORLENGTH-len); |
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134 WideCharToMultiByte(CP_ACP,0,werrbuf,-1,errbuf+len,MAXERRORLENGTH-len,NULL,NULL); |
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135 #else |
| 0 | 136 waveOutGetErrorText(code, errbuf+len, MAXERRORLENGTH-len); |
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137 #endif |
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138 |
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139 SDL_SetError("%s",errbuf); |
| 0 | 140 } |
| 141 | |
| 142 /* Set high priority for the audio thread */ | |
| 143 static void DIB_ThreadInit(_THIS) | |
| 144 { | |
| 145 SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST); | |
| 146 } | |
| 147 | |
| 148 void DIB_WaitAudio(_THIS) | |
| 149 { | |
| 150 /* Wait for an audio chunk to finish */ | |
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151 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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152 WaitForSemaphoreCE(audio_sem, INFINITE); |
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153 #else |
| 0 | 154 WaitForSingleObject(audio_sem, INFINITE); |
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155 #endif |
| 0 | 156 } |
| 157 | |
| 158 Uint8 *DIB_GetAudioBuf(_THIS) | |
| 159 { | |
| 160 Uint8 *retval; | |
| 161 | |
| 162 retval = (Uint8 *)(wavebuf[next_buffer].lpData); | |
| 163 return retval; | |
| 164 } | |
| 165 | |
| 166 void DIB_PlayAudio(_THIS) | |
| 167 { | |
| 168 /* Queue it up */ | |
| 169 waveOutWrite(sound, &wavebuf[next_buffer], sizeof(wavebuf[0])); | |
| 170 next_buffer = (next_buffer+1)%NUM_BUFFERS; | |
| 171 } | |
| 172 | |
| 173 void DIB_WaitDone(_THIS) | |
| 174 { | |
| 175 int i, left; | |
| 176 | |
| 177 do { | |
| 178 left = NUM_BUFFERS; | |
| 179 for ( i=0; i<NUM_BUFFERS; ++i ) { | |
| 180 if ( wavebuf[i].dwFlags & WHDR_DONE ) { | |
| 181 --left; | |
| 182 } | |
| 183 } | |
| 184 if ( left > 0 ) { | |
| 185 SDL_Delay(100); | |
| 186 } | |
| 187 } while ( left > 0 ); | |
| 188 } | |
| 189 | |
| 190 void DIB_CloseAudio(_THIS) | |
| 191 { | |
| 192 int i; | |
| 193 | |
| 194 /* Close up audio */ | |
| 195 if ( audio_sem ) { | |
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196 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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197 CloseSynchHandle(audio_sem); |
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198 #else |
| 0 | 199 CloseHandle(audio_sem); |
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200 #endif |
| 0 | 201 } |
| 202 if ( sound ) { | |
| 203 waveOutClose(sound); | |
| 204 } | |
| 205 | |
| 206 /* Clean up mixing buffers */ | |
| 207 for ( i=0; i<NUM_BUFFERS; ++i ) { | |
| 208 if ( wavebuf[i].dwUser != 0xFFFF ) { | |
| 209 waveOutUnprepareHeader(sound, &wavebuf[i], | |
| 210 sizeof(wavebuf[i])); | |
| 211 wavebuf[i].dwUser = 0xFFFF; | |
| 212 } | |
| 213 } | |
| 214 /* Free raw mixing buffer */ | |
| 215 if ( mixbuf != NULL ) { | |
| 216 free(mixbuf); | |
| 217 mixbuf = NULL; | |
| 218 } | |
| 219 } | |
| 220 | |
| 221 int DIB_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 222 { | |
| 223 MMRESULT result; | |
| 224 int i; | |
| 225 WAVEFORMATEX waveformat; | |
| 226 | |
| 227 /* Initialize the wavebuf structures for closing */ | |
| 228 sound = NULL; | |
| 229 audio_sem = NULL; | |
| 230 for ( i = 0; i < NUM_BUFFERS; ++i ) | |
| 231 wavebuf[i].dwUser = 0xFFFF; | |
| 232 mixbuf = NULL; | |
| 233 | |
| 234 /* Set basic WAVE format parameters */ | |
| 235 memset(&waveformat, 0, sizeof(waveformat)); | |
| 236 waveformat.wFormatTag = WAVE_FORMAT_PCM; | |
| 237 | |
| 238 /* Determine the audio parameters from the AudioSpec */ | |
| 239 switch ( spec->format & 0xFF ) { | |
| 240 case 8: | |
| 241 /* Unsigned 8 bit audio data */ | |
| 242 spec->format = AUDIO_U8; | |
| 243 waveformat.wBitsPerSample = 8; | |
| 244 break; | |
| 245 case 16: | |
| 246 /* Signed 16 bit audio data */ | |
| 247 spec->format = AUDIO_S16; | |
| 248 waveformat.wBitsPerSample = 16; | |
| 249 break; | |
| 250 default: | |
| 251 SDL_SetError("Unsupported audio format"); | |
| 252 return(-1); | |
| 253 } | |
| 254 waveformat.nChannels = spec->channels; | |
| 255 waveformat.nSamplesPerSec = spec->freq; | |
| 256 waveformat.nBlockAlign = | |
| 257 waveformat.nChannels * (waveformat.wBitsPerSample/8); | |
| 258 waveformat.nAvgBytesPerSec = | |
| 259 waveformat.nSamplesPerSec * waveformat.nBlockAlign; | |
| 260 | |
| 261 /* Check the buffer size -- minimum of 1/4 second (word aligned) */ | |
| 262 if ( spec->samples < (spec->freq/4) ) | |
| 263 spec->samples = ((spec->freq/4)+3)&~3; | |
| 264 | |
| 265 /* Update the fragment size as size in bytes */ | |
| 266 SDL_CalculateAudioSpec(spec); | |
| 267 | |
| 268 /* Open the audio device */ | |
| 269 result = waveOutOpen(&sound, WAVE_MAPPER, &waveformat, | |
| 270 (DWORD)FillSound, (DWORD)this, CALLBACK_FUNCTION); | |
| 271 if ( result != MMSYSERR_NOERROR ) { | |
| 272 SetMMerror("waveOutOpen()", result); | |
| 273 return(-1); | |
| 274 } | |
| 275 | |
| 276 #ifdef SOUND_DEBUG | |
| 277 /* Check the sound device we retrieved */ | |
| 278 { | |
| 279 WAVEOUTCAPS caps; | |
| 280 | |
| 281 result = waveOutGetDevCaps((UINT)sound, &caps, sizeof(caps)); | |
| 282 if ( result != MMSYSERR_NOERROR ) { | |
| 283 SetMMerror("waveOutGetDevCaps()", result); | |
| 284 return(-1); | |
| 285 } | |
| 286 printf("Audio device: %s\n", caps.szPname); | |
| 287 } | |
| 288 #endif | |
| 289 | |
| 290 /* Create the audio buffer semaphore */ | |
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291 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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292 audio_sem = CreateSemaphoreCE(NULL, NUM_BUFFERS-1, NUM_BUFFERS, NULL); |
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293 #else |
| 0 | 294 audio_sem = CreateSemaphore(NULL, NUM_BUFFERS-1, NUM_BUFFERS, NULL); |
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295 #endif |
| 0 | 296 if ( audio_sem == NULL ) { |
| 297 SDL_SetError("Couldn't create semaphore"); | |
| 298 return(-1); | |
| 299 } | |
| 300 | |
| 301 /* Create the sound buffers */ | |
| 302 mixbuf = (Uint8 *)malloc(NUM_BUFFERS*spec->size); | |
| 303 if ( mixbuf == NULL ) { | |
| 304 SDL_SetError("Out of memory"); | |
| 305 return(-1); | |
| 306 } | |
| 307 for ( i = 0; i < NUM_BUFFERS; ++i ) { | |
| 308 memset(&wavebuf[i], 0, sizeof(wavebuf[i])); | |
| 309 wavebuf[i].lpData = (LPSTR) &mixbuf[i*spec->size]; | |
| 310 wavebuf[i].dwBufferLength = spec->size; | |
| 311 wavebuf[i].dwFlags = WHDR_DONE; | |
| 312 result = waveOutPrepareHeader(sound, &wavebuf[i], | |
| 313 sizeof(wavebuf[i])); | |
| 314 if ( result != MMSYSERR_NOERROR ) { | |
| 315 SetMMerror("waveOutPrepareHeader()", result); | |
| 316 return(-1); | |
| 317 } | |
| 318 } | |
| 319 | |
| 320 /* Ready to go! */ | |
| 321 next_buffer = 0; | |
| 322 return(0); | |
| 323 } |