]>
Commit | Line | Data |
---|---|---|
1 | ///////////////////////////////////////////////////////////////////////////// | |
2 | // Name: src/unix/sound.cpp | |
3 | // Purpose: wxSound | |
4 | // Author: Marcel Rasche, Vaclav Slavik | |
5 | // Modified by: | |
6 | // Created: 25/10/98 | |
7 | // RCS-ID: $Id$ | |
8 | // Copyright: (c) Julian Smart, Open Source Applications Foundation | |
9 | // Licence: wxWindows licence | |
10 | ///////////////////////////////////////////////////////////////////////////// | |
11 | ||
12 | // for compilers that support precompilation, includes "wx.h". | |
13 | #include "wx/wxprec.h" | |
14 | ||
15 | #if defined(__BORLANDC__) | |
16 | #pragma hdrstop | |
17 | #endif | |
18 | ||
19 | #if wxUSE_SOUND | |
20 | ||
21 | #include <stdio.h> | |
22 | #include <unistd.h> | |
23 | #include <fcntl.h> | |
24 | #include <sys/ioctl.h> | |
25 | ||
26 | #ifdef HAVE_SYS_SOUNDCARD_H | |
27 | #include <sys/soundcard.h> | |
28 | #endif | |
29 | ||
30 | #ifndef WX_PRECOMP | |
31 | #include "wx/event.h" | |
32 | #include "wx/intl.h" | |
33 | #include "wx/log.h" | |
34 | #include "wx/module.h" | |
35 | #endif | |
36 | ||
37 | #include "wx/thread.h" | |
38 | #include "wx/file.h" | |
39 | #include "wx/sound.h" | |
40 | #include "wx/dynlib.h" | |
41 | ||
42 | ||
43 | #if wxUSE_THREADS | |
44 | // mutex for all wxSound's synchronization | |
45 | static wxMutex gs_soundMutex; | |
46 | #endif | |
47 | ||
48 | // ---------------------------------------------------------------------------- | |
49 | // wxSoundData | |
50 | // ---------------------------------------------------------------------------- | |
51 | ||
52 | void wxSoundData::IncRef() | |
53 | { | |
54 | #if wxUSE_THREADS | |
55 | wxMutexLocker locker(gs_soundMutex); | |
56 | #endif | |
57 | m_refCnt++; | |
58 | } | |
59 | ||
60 | void wxSoundData::DecRef() | |
61 | { | |
62 | #if wxUSE_THREADS | |
63 | wxMutexLocker locker(gs_soundMutex); | |
64 | #endif | |
65 | if (--m_refCnt == 0) | |
66 | delete this; | |
67 | } | |
68 | ||
69 | wxSoundData::~wxSoundData() | |
70 | { | |
71 | delete[] m_dataWithHeader; | |
72 | } | |
73 | ||
74 | ||
75 | // ---------------------------------------------------------------------------- | |
76 | // wxSoundBackendNull, used in absence of audio API or card | |
77 | // ---------------------------------------------------------------------------- | |
78 | ||
79 | class wxSoundBackendNull : public wxSoundBackend | |
80 | { | |
81 | public: | |
82 | wxString GetName() const { return _("No sound"); } | |
83 | int GetPriority() const { return 0; } | |
84 | bool IsAvailable() const { return true; } | |
85 | bool HasNativeAsyncPlayback() const { return true; } | |
86 | bool Play(wxSoundData *WXUNUSED(data), unsigned WXUNUSED(flags), | |
87 | volatile wxSoundPlaybackStatus *WXUNUSED(status)) | |
88 | { return true; } | |
89 | void Stop() {} | |
90 | bool IsPlaying() const { return false; } | |
91 | }; | |
92 | ||
93 | ||
94 | // ---------------------------------------------------------------------------- | |
95 | // wxSoundBackendOSS, for Linux | |
96 | // ---------------------------------------------------------------------------- | |
97 | ||
98 | #ifdef HAVE_SYS_SOUNDCARD_H | |
99 | ||
100 | #ifndef AUDIODEV | |
101 | #define AUDIODEV "/dev/dsp" // Default path for audio device | |
102 | #endif | |
103 | ||
104 | class wxSoundBackendOSS : public wxSoundBackend | |
105 | { | |
106 | public: | |
107 | wxString GetName() const { return wxT("Open Sound System"); } | |
108 | int GetPriority() const { return 10; } | |
109 | bool IsAvailable() const; | |
110 | bool HasNativeAsyncPlayback() const { return false; } | |
111 | bool Play(wxSoundData *data, unsigned flags, | |
112 | volatile wxSoundPlaybackStatus *status); | |
113 | void Stop() {} | |
114 | bool IsPlaying() const { return false; } | |
115 | ||
116 | private: | |
117 | int OpenDSP(const wxSoundData *data); | |
118 | bool InitDSP(int dev, const wxSoundData *data); | |
119 | ||
120 | int m_DSPblkSize; // Size of the DSP buffer | |
121 | bool m_needConversion; | |
122 | }; | |
123 | ||
124 | bool wxSoundBackendOSS::IsAvailable() const | |
125 | { | |
126 | int fd; | |
127 | fd = open(AUDIODEV, O_WRONLY | O_NONBLOCK); | |
128 | if (fd < 0) | |
129 | return false; | |
130 | close(fd); | |
131 | return true; | |
132 | } | |
133 | ||
134 | bool wxSoundBackendOSS::Play(wxSoundData *data, unsigned flags, | |
135 | volatile wxSoundPlaybackStatus *status) | |
136 | { | |
137 | int dev = OpenDSP(data); | |
138 | ||
139 | if (dev < 0) | |
140 | return false; | |
141 | ||
142 | ioctl(dev, SNDCTL_DSP_SYNC, 0); | |
143 | ||
144 | do | |
145 | { | |
146 | bool play = true; | |
147 | int i; | |
148 | unsigned l = 0; | |
149 | size_t datasize = data->m_dataBytes; | |
150 | ||
151 | do | |
152 | { | |
153 | if (status->m_stopRequested) | |
154 | { | |
155 | wxLogTrace(wxT("sound"), wxT("playback stopped")); | |
156 | close(dev); | |
157 | return true; | |
158 | } | |
159 | ||
160 | i= (int)((l + m_DSPblkSize) < datasize ? | |
161 | m_DSPblkSize : (datasize - l)); | |
162 | if (write(dev, &data->m_data[l], i) != i) | |
163 | { | |
164 | play = false; | |
165 | } | |
166 | l += i; | |
167 | } while (play && l < datasize); | |
168 | } while (flags & wxSOUND_LOOP); | |
169 | ||
170 | close(dev); | |
171 | return true; | |
172 | } | |
173 | ||
174 | int wxSoundBackendOSS::OpenDSP(const wxSoundData *data) | |
175 | { | |
176 | int dev = -1; | |
177 | ||
178 | if ((dev = open(AUDIODEV, O_WRONLY, 0)) <0) | |
179 | return -1; | |
180 | ||
181 | if (!InitDSP(dev, data) || m_needConversion) | |
182 | { | |
183 | close(dev); | |
184 | return -1; | |
185 | } | |
186 | ||
187 | return dev; | |
188 | } | |
189 | ||
190 | ||
191 | bool wxSoundBackendOSS::InitDSP(int dev, const wxSoundData *data) | |
192 | { | |
193 | unsigned tmp; | |
194 | ||
195 | // Reset the dsp | |
196 | if (ioctl(dev, SNDCTL_DSP_RESET, 0) < 0) | |
197 | { | |
198 | wxLogTrace(wxT("sound"), wxT("unable to reset dsp")); | |
199 | return false; | |
200 | } | |
201 | ||
202 | m_needConversion = false; | |
203 | ||
204 | tmp = data->m_bitsPerSample; | |
205 | if (ioctl(dev, SNDCTL_DSP_SAMPLESIZE, &tmp) < 0) | |
206 | { | |
207 | wxLogTrace(wxT("sound"), wxT("IOCTL failure (SNDCTL_DSP_SAMPLESIZE)")); | |
208 | return false; | |
209 | } | |
210 | if (tmp != data->m_bitsPerSample) | |
211 | { | |
212 | wxLogTrace(wxT("sound"), | |
213 | wxT("Unable to set DSP sample size to %d (wants %d)"), | |
214 | data->m_bitsPerSample, tmp); | |
215 | m_needConversion = true; | |
216 | } | |
217 | ||
218 | unsigned stereo = data->m_channels == 1 ? 0 : 1; | |
219 | tmp = stereo; | |
220 | if (ioctl(dev, SNDCTL_DSP_STEREO, &tmp) < 0) | |
221 | { | |
222 | wxLogTrace(wxT("sound"), wxT("IOCTL failure (SNDCTL_DSP_STEREO)")); | |
223 | return false; | |
224 | } | |
225 | if (tmp != stereo) | |
226 | { | |
227 | wxLogTrace(wxT("sound"), wxT("Unable to set DSP to %s."), stereo? wxT("stereo"):wxT("mono")); | |
228 | m_needConversion = true; | |
229 | } | |
230 | ||
231 | tmp = data->m_samplingRate; | |
232 | if (ioctl(dev, SNDCTL_DSP_SPEED, &tmp) < 0) | |
233 | { | |
234 | wxLogTrace(wxT("sound"), wxT("IOCTL failure (SNDCTL_DSP_SPEED)")); | |
235 | return false; | |
236 | } | |
237 | if (tmp != data->m_samplingRate) | |
238 | { | |
239 | // If the rate the sound card is using is not within 1% of what the | |
240 | // data specified then override the data setting. The only reason not | |
241 | // to always override this is because of clock-rounding | |
242 | // problems. Sound cards will sometimes use things like 44101 when you | |
243 | // ask for 44100. No need overriding this and having strange output | |
244 | // file rates for something that we can't hear anyways. | |
245 | if (data->m_samplingRate - tmp > (tmp * .01) || | |
246 | tmp - data->m_samplingRate > (tmp * .01)) { | |
247 | wxLogTrace(wxT("sound"), | |
248 | wxT("Unable to set DSP sampling rate to %d (wants %d)"), | |
249 | data->m_samplingRate, tmp); | |
250 | m_needConversion = true; | |
251 | } | |
252 | } | |
253 | ||
254 | // Do this last because some drivers can adjust the buffer sized based on | |
255 | // the sampling rate, etc. | |
256 | if (ioctl(dev, SNDCTL_DSP_GETBLKSIZE, &m_DSPblkSize) < 0) | |
257 | { | |
258 | wxLogTrace(wxT("sound"), wxT("IOCTL failure (SNDCTL_DSP_GETBLKSIZE)")); | |
259 | return false; | |
260 | } | |
261 | return true; | |
262 | } | |
263 | ||
264 | #endif // HAVE_SYS_SOUNDCARD_H | |
265 | ||
266 | // ---------------------------------------------------------------------------- | |
267 | // wxSoundSyncOnlyAdaptor | |
268 | // ---------------------------------------------------------------------------- | |
269 | ||
270 | #if wxUSE_THREADS | |
271 | ||
272 | class wxSoundSyncOnlyAdaptor; | |
273 | ||
274 | // this class manages asynchronous playback of audio if the backend doesn't | |
275 | // support it natively (e.g. OSS backend) | |
276 | class wxSoundAsyncPlaybackThread : public wxThread | |
277 | { | |
278 | public: | |
279 | wxSoundAsyncPlaybackThread(wxSoundSyncOnlyAdaptor *adaptor, | |
280 | wxSoundData *data, unsigned flags) | |
281 | : wxThread(), m_adapt(adaptor), m_data(data), m_flags(flags) {} | |
282 | virtual ExitCode Entry(); | |
283 | ||
284 | protected: | |
285 | wxSoundSyncOnlyAdaptor *m_adapt; | |
286 | wxSoundData *m_data; | |
287 | unsigned m_flags; | |
288 | }; | |
289 | ||
290 | #endif // wxUSE_THREADS | |
291 | ||
292 | // This class turns wxSoundBackend that doesn't support asynchronous playback | |
293 | // into one that does | |
294 | class wxSoundSyncOnlyAdaptor : public wxSoundBackend | |
295 | { | |
296 | public: | |
297 | wxSoundSyncOnlyAdaptor(wxSoundBackend *backend) | |
298 | : m_backend(backend), m_playing(false) {} | |
299 | virtual ~wxSoundSyncOnlyAdaptor() | |
300 | { | |
301 | delete m_backend; | |
302 | } | |
303 | wxString GetName() const | |
304 | { | |
305 | return m_backend->GetName(); | |
306 | } | |
307 | int GetPriority() const | |
308 | { | |
309 | return m_backend->GetPriority(); | |
310 | } | |
311 | bool IsAvailable() const | |
312 | { | |
313 | return m_backend->IsAvailable(); | |
314 | } | |
315 | bool HasNativeAsyncPlayback() const | |
316 | { | |
317 | return true; | |
318 | } | |
319 | bool Play(wxSoundData *data, unsigned flags, | |
320 | volatile wxSoundPlaybackStatus *status); | |
321 | void Stop(); | |
322 | bool IsPlaying() const; | |
323 | ||
324 | private: | |
325 | friend class wxSoundAsyncPlaybackThread; | |
326 | ||
327 | wxSoundBackend *m_backend; | |
328 | bool m_playing; | |
329 | #if wxUSE_THREADS | |
330 | // player thread holds this mutex and releases it after it finishes | |
331 | // playing, so that the main thread knows when it can play sound | |
332 | wxMutex m_mutexRightToPlay; | |
333 | wxSoundPlaybackStatus m_status; | |
334 | #endif | |
335 | }; | |
336 | ||
337 | ||
338 | #if wxUSE_THREADS | |
339 | wxThread::ExitCode wxSoundAsyncPlaybackThread::Entry() | |
340 | { | |
341 | m_adapt->m_backend->Play(m_data, m_flags & ~wxSOUND_ASYNC, | |
342 | &m_adapt->m_status); | |
343 | ||
344 | m_data->DecRef(); | |
345 | m_adapt->m_playing = false; | |
346 | m_adapt->m_mutexRightToPlay.Unlock(); | |
347 | wxLogTrace(wxT("sound"), wxT("terminated async playback thread")); | |
348 | return 0; | |
349 | } | |
350 | #endif | |
351 | ||
352 | bool wxSoundSyncOnlyAdaptor::Play(wxSoundData *data, unsigned flags, | |
353 | volatile wxSoundPlaybackStatus *status) | |
354 | { | |
355 | Stop(); | |
356 | if (flags & wxSOUND_ASYNC) | |
357 | { | |
358 | #if wxUSE_THREADS | |
359 | m_mutexRightToPlay.Lock(); | |
360 | m_status.m_playing = true; | |
361 | m_status.m_stopRequested = false; | |
362 | data->IncRef(); | |
363 | wxThread *th = new wxSoundAsyncPlaybackThread(this, data, flags); | |
364 | th->Create(); | |
365 | th->Run(); | |
366 | wxLogTrace(wxT("sound"), wxT("launched async playback thread")); | |
367 | return true; | |
368 | #else | |
369 | wxLogError(_("Unable to play sound asynchronously.")); | |
370 | return false; | |
371 | #endif | |
372 | } | |
373 | else | |
374 | { | |
375 | #if wxUSE_THREADS | |
376 | m_mutexRightToPlay.Lock(); | |
377 | #endif | |
378 | bool rv = m_backend->Play(data, flags, status); | |
379 | #if wxUSE_THREADS | |
380 | m_mutexRightToPlay.Unlock(); | |
381 | #endif | |
382 | return rv; | |
383 | } | |
384 | } | |
385 | ||
386 | void wxSoundSyncOnlyAdaptor::Stop() | |
387 | { | |
388 | wxLogTrace(wxT("sound"), wxT("asking audio to stop")); | |
389 | ||
390 | #if wxUSE_THREADS | |
391 | // tell the player thread (if running) to stop playback ASAP: | |
392 | m_status.m_stopRequested = true; | |
393 | ||
394 | // acquire the mutex to be sure no sound is being played, then | |
395 | // release it because we don't need it for anything (the effect of this | |
396 | // is that calling thread will wait until playback thread reacts to | |
397 | // our request to interrupt playback): | |
398 | m_mutexRightToPlay.Lock(); | |
399 | m_mutexRightToPlay.Unlock(); | |
400 | wxLogTrace(wxT("sound"), wxT("audio was stopped")); | |
401 | #endif | |
402 | } | |
403 | ||
404 | bool wxSoundSyncOnlyAdaptor::IsPlaying() const | |
405 | { | |
406 | #if wxUSE_THREADS | |
407 | return m_status.m_playing; | |
408 | #else | |
409 | return false; | |
410 | #endif | |
411 | } | |
412 | ||
413 | ||
414 | // ---------------------------------------------------------------------------- | |
415 | // wxSound | |
416 | // ---------------------------------------------------------------------------- | |
417 | ||
418 | wxSoundBackend *wxSound::ms_backend = NULL; | |
419 | ||
420 | // FIXME - temporary, until we have plugins architecture | |
421 | #if wxUSE_LIBSDL | |
422 | #if wxUSE_PLUGINS | |
423 | wxDynamicLibrary *wxSound::ms_backendSDL = NULL; | |
424 | #else | |
425 | extern "C" wxSoundBackend *wxCreateSoundBackendSDL(); | |
426 | #endif | |
427 | #endif | |
428 | ||
429 | wxSound::wxSound() : m_data(NULL) | |
430 | { | |
431 | } | |
432 | ||
433 | wxSound::wxSound(const wxString& sFileName, bool isResource) : m_data(NULL) | |
434 | { | |
435 | Create(sFileName, isResource); | |
436 | } | |
437 | ||
438 | wxSound::wxSound(int size, const wxByte* data) : m_data(NULL) | |
439 | { | |
440 | Create(size, data); | |
441 | } | |
442 | ||
443 | wxSound::~wxSound() | |
444 | { | |
445 | Free(); | |
446 | } | |
447 | ||
448 | bool wxSound::Create(const wxString& fileName, | |
449 | bool WXUNUSED_UNLESS_DEBUG(isResource)) | |
450 | { | |
451 | wxASSERT_MSG( !isResource, | |
452 | wxT("Loading sound from resources is only supported on Windows") ); | |
453 | ||
454 | Free(); | |
455 | ||
456 | wxFile fileWave; | |
457 | if (!fileWave.Open(fileName, wxFile::read)) | |
458 | { | |
459 | return false; | |
460 | } | |
461 | ||
462 | wxFileOffset lenOrig = fileWave.Length(); | |
463 | if ( lenOrig == wxInvalidOffset ) | |
464 | return false; | |
465 | ||
466 | size_t len = wx_truncate_cast(size_t, lenOrig); | |
467 | wxUint8 *data = new wxUint8[len]; | |
468 | if ( fileWave.Read(data, len) != lenOrig ) | |
469 | { | |
470 | delete [] data; | |
471 | wxLogError(_("Couldn't load sound data from '%s'."), fileName.c_str()); | |
472 | return false; | |
473 | } | |
474 | ||
475 | if (!LoadWAV(data, len, false)) | |
476 | { | |
477 | delete [] data; | |
478 | wxLogError(_("Sound file '%s' is in unsupported format."), | |
479 | fileName.c_str()); | |
480 | return false; | |
481 | } | |
482 | ||
483 | return true; | |
484 | } | |
485 | ||
486 | bool wxSound::Create(int size, const wxByte* data) | |
487 | { | |
488 | wxASSERT( data != NULL ); | |
489 | ||
490 | Free(); | |
491 | if (!LoadWAV(data, size, true)) | |
492 | { | |
493 | wxLogError(_("Sound data are in unsupported format.")); | |
494 | return false; | |
495 | } | |
496 | return true; | |
497 | } | |
498 | ||
499 | /*static*/ void wxSound::EnsureBackend() | |
500 | { | |
501 | if (!ms_backend) | |
502 | { | |
503 | // FIXME -- make this fully dynamic when plugins architecture is in | |
504 | // place | |
505 | #if wxUSE_LIBSDL | |
506 | //if (!ms_backend) | |
507 | { | |
508 | #if !wxUSE_PLUGINS | |
509 | ms_backend = wxCreateSoundBackendSDL(); | |
510 | #else | |
511 | wxString dllname; | |
512 | dllname.Printf(wxT("%s/%s"), | |
513 | wxDynamicLibrary::GetPluginsDirectory().c_str(), | |
514 | wxDynamicLibrary::CanonicalizePluginName( | |
515 | wxT("sound_sdl"), wxDL_PLUGIN_BASE).c_str()); | |
516 | wxLogTrace(wxT("sound"), | |
517 | wxT("trying to load SDL plugin from '%s'..."), | |
518 | dllname.c_str()); | |
519 | wxLogNull null; | |
520 | ms_backendSDL = new wxDynamicLibrary(dllname, wxDL_NOW); | |
521 | if (!ms_backendSDL->IsLoaded()) | |
522 | { | |
523 | wxDELETE(ms_backendSDL); | |
524 | } | |
525 | else | |
526 | { | |
527 | typedef wxSoundBackend *(*wxCreateSoundBackend_t)(); | |
528 | wxDYNLIB_FUNCTION(wxCreateSoundBackend_t, | |
529 | wxCreateSoundBackendSDL, *ms_backendSDL); | |
530 | if (pfnwxCreateSoundBackendSDL) | |
531 | { | |
532 | ms_backend = (*pfnwxCreateSoundBackendSDL)(); | |
533 | } | |
534 | } | |
535 | #endif | |
536 | if (ms_backend && !ms_backend->IsAvailable()) | |
537 | { | |
538 | wxDELETE(ms_backend); | |
539 | } | |
540 | } | |
541 | #endif | |
542 | ||
543 | #ifdef HAVE_SYS_SOUNDCARD_H | |
544 | if (!ms_backend) | |
545 | { | |
546 | ms_backend = new wxSoundBackendOSS(); | |
547 | if (!ms_backend->IsAvailable()) | |
548 | { | |
549 | wxDELETE(ms_backend); | |
550 | } | |
551 | } | |
552 | #endif | |
553 | ||
554 | if (!ms_backend) | |
555 | ms_backend = new wxSoundBackendNull(); | |
556 | ||
557 | if (!ms_backend->HasNativeAsyncPlayback()) | |
558 | ms_backend = new wxSoundSyncOnlyAdaptor(ms_backend); | |
559 | ||
560 | wxLogTrace(wxT("sound"), | |
561 | wxT("using backend '%s'"), ms_backend->GetName().c_str()); | |
562 | } | |
563 | } | |
564 | ||
565 | /*static*/ void wxSound::UnloadBackend() | |
566 | { | |
567 | if (ms_backend) | |
568 | { | |
569 | wxLogTrace(wxT("sound"), wxT("unloading backend")); | |
570 | ||
571 | Stop(); | |
572 | ||
573 | delete ms_backend; | |
574 | ms_backend = NULL; | |
575 | #if wxUSE_LIBSDL && wxUSE_PLUGINS | |
576 | delete ms_backendSDL; | |
577 | #endif | |
578 | } | |
579 | } | |
580 | ||
581 | bool wxSound::DoPlay(unsigned flags) const | |
582 | { | |
583 | wxCHECK_MSG( IsOk(), false, wxT("Attempt to play invalid wave data") ); | |
584 | ||
585 | EnsureBackend(); | |
586 | wxSoundPlaybackStatus status; | |
587 | status.m_playing = true; | |
588 | status.m_stopRequested = false; | |
589 | return ms_backend->Play(m_data, flags, &status); | |
590 | } | |
591 | ||
592 | /*static*/ void wxSound::Stop() | |
593 | { | |
594 | if (ms_backend) | |
595 | ms_backend->Stop(); | |
596 | } | |
597 | ||
598 | /*static*/ bool wxSound::IsPlaying() | |
599 | { | |
600 | if (ms_backend) | |
601 | return ms_backend->IsPlaying(); | |
602 | else | |
603 | return false; | |
604 | } | |
605 | ||
606 | void wxSound::Free() | |
607 | { | |
608 | if (m_data) | |
609 | m_data->DecRef(); | |
610 | } | |
611 | ||
612 | typedef struct | |
613 | { | |
614 | wxUint32 uiSize; | |
615 | wxUint16 uiFormatTag; | |
616 | wxUint16 uiChannels; | |
617 | wxUint32 ulSamplesPerSec; | |
618 | wxUint32 ulAvgBytesPerSec; | |
619 | wxUint16 uiBlockAlign; | |
620 | wxUint16 uiBitsPerSample; | |
621 | } WAVEFORMAT; | |
622 | ||
623 | #define WAVE_FORMAT_PCM 1 | |
624 | #define WAVE_INDEX 8 | |
625 | #define FMT_INDEX 12 | |
626 | ||
627 | bool wxSound::LoadWAV(const wxUint8 *data, size_t length, bool copyData) | |
628 | { | |
629 | // the simplest wave file header consists of 44 bytes: | |
630 | // | |
631 | // 0 "RIFF" | |
632 | // 4 file size - 8 | |
633 | // 8 "WAVE" | |
634 | // | |
635 | // 12 "fmt " | |
636 | // 16 chunk size | | |
637 | // 20 format tag | | |
638 | // 22 number of channels | | |
639 | // 24 sample rate | WAVEFORMAT | |
640 | // 28 average bytes per second | | |
641 | // 32 bytes per frame | | |
642 | // 34 bits per sample | | |
643 | // | |
644 | // 36 "data" | |
645 | // 40 number of data bytes | |
646 | // 44 (wave signal) data | |
647 | // | |
648 | // so check that we have at least as much | |
649 | if ( length < 44 ) | |
650 | return false; | |
651 | ||
652 | WAVEFORMAT waveformat; | |
653 | memcpy(&waveformat, &data[FMT_INDEX + 4], sizeof(WAVEFORMAT)); | |
654 | waveformat.uiSize = wxUINT32_SWAP_ON_BE(waveformat.uiSize); | |
655 | waveformat.uiFormatTag = wxUINT16_SWAP_ON_BE(waveformat.uiFormatTag); | |
656 | waveformat.uiChannels = wxUINT16_SWAP_ON_BE(waveformat.uiChannels); | |
657 | waveformat.ulSamplesPerSec = wxUINT32_SWAP_ON_BE(waveformat.ulSamplesPerSec); | |
658 | waveformat.ulAvgBytesPerSec = wxUINT32_SWAP_ON_BE(waveformat.ulAvgBytesPerSec); | |
659 | waveformat.uiBlockAlign = wxUINT16_SWAP_ON_BE(waveformat.uiBlockAlign); | |
660 | waveformat.uiBitsPerSample = wxUINT16_SWAP_ON_BE(waveformat.uiBitsPerSample); | |
661 | ||
662 | // get the sound data size | |
663 | wxUint32 ul; | |
664 | memcpy(&ul, &data[FMT_INDEX + waveformat.uiSize + 12], 4); | |
665 | ul = wxUINT32_SWAP_ON_BE(ul); | |
666 | ||
667 | if ( length < ul + FMT_INDEX + waveformat.uiSize + 16 ) | |
668 | return false; | |
669 | ||
670 | if (memcmp(data, "RIFF", 4) != 0) | |
671 | return false; | |
672 | if (memcmp(&data[WAVE_INDEX], "WAVE", 4) != 0) | |
673 | return false; | |
674 | if (memcmp(&data[FMT_INDEX], "fmt ", 4) != 0) | |
675 | return false; | |
676 | if (memcmp(&data[FMT_INDEX + waveformat.uiSize + 8], "data", 4) != 0) | |
677 | return false; | |
678 | ||
679 | if (waveformat.uiFormatTag != WAVE_FORMAT_PCM) | |
680 | return false; | |
681 | ||
682 | if (waveformat.ulSamplesPerSec != | |
683 | waveformat.ulAvgBytesPerSec / waveformat.uiBlockAlign) | |
684 | return false; | |
685 | ||
686 | m_data = new wxSoundData; | |
687 | m_data->m_channels = waveformat.uiChannels; | |
688 | m_data->m_samplingRate = waveformat.ulSamplesPerSec; | |
689 | m_data->m_bitsPerSample = waveformat.uiBitsPerSample; | |
690 | m_data->m_samples = ul / (m_data->m_channels * m_data->m_bitsPerSample / 8); | |
691 | m_data->m_dataBytes = ul; | |
692 | ||
693 | if (copyData) | |
694 | { | |
695 | m_data->m_dataWithHeader = new wxUint8[length]; | |
696 | memcpy(m_data->m_dataWithHeader, data, length); | |
697 | } | |
698 | else | |
699 | m_data->m_dataWithHeader = (wxUint8*)data; | |
700 | ||
701 | m_data->m_data = | |
702 | (&m_data->m_dataWithHeader[FMT_INDEX + waveformat.uiSize + 8]); | |
703 | ||
704 | return true; | |
705 | } | |
706 | ||
707 | ||
708 | // ---------------------------------------------------------------------------- | |
709 | // wxSoundCleanupModule | |
710 | // ---------------------------------------------------------------------------- | |
711 | ||
712 | class wxSoundCleanupModule: public wxModule | |
713 | { | |
714 | public: | |
715 | bool OnInit() { return true; } | |
716 | void OnExit() { wxSound::UnloadBackend(); } | |
717 | DECLARE_DYNAMIC_CLASS(wxSoundCleanupModule) | |
718 | }; | |
719 | ||
720 | IMPLEMENT_DYNAMIC_CLASS(wxSoundCleanupModule, wxModule) | |
721 | ||
722 | #endif |