1 // soundmgr.cxx -- Sound effect management class
3 // Sound manager initially written by David Findlay
4 // <david_j_findlay@yahoo.com.au> 2001
6 // C++-ified by Curtis Olson, started March 2001.
8 // Copyright (C) 2001 Curtis L. Olson - curt@flightgear.org
10 // This program is free software; you can redistribute it and/or
11 // modify it under the terms of the GNU General Public License as
12 // published by the Free Software Foundation; either version 2 of the
13 // License, or (at your option) any later version.
15 // This program is distributed in the hope that it will be useful, but
16 // WITHOUT ANY WARRANTY; without even the implied warranty of
17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 // General Public License for more details.
20 // You should have received a copy of the GNU General Public License
21 // along with this program; if not, write to the Free Software
22 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 #include <simgear/debug/logstream.hxx>
28 #include <simgear/misc/sg_path.hxx>
30 #include <Main/globals.hxx>
32 #include "soundmgr.hxx"
34 #define FG_SOUND_SAFETY_MULT 3
35 #define FG_MAX_SOUND_SAFETY ( 1.0 / FG_SOUND_SAFETY_MULT )
42 FGSimpleSound::FGSimpleSound( string file )
46 SGPath slfile( globals->get_fg_root() );
47 slfile.append( file );
48 sample = new slSample ( (char *)slfile.c_str() );
49 pitch_envelope = new slEnvelope( 1, SL_SAMPLE_ONE_SHOT );
50 volume_envelope = new slEnvelope( 1, SL_SAMPLE_ONE_SHOT );
51 pitch_envelope->setStep ( 0, 0.01, 1.0 );
52 volume_envelope->setStep ( 0, 0.01, 1.0 );
55 FGSimpleSound::FGSimpleSound( unsigned char *buffer, int len )
59 sample = new slSample ( buffer, len );
60 pitch_envelope = new slEnvelope( 1, SL_SAMPLE_ONE_SHOT );
61 volume_envelope = new slEnvelope( 1, SL_SAMPLE_ONE_SHOT );
62 pitch_envelope->setStep ( 0, 0.01, 1.0 );
63 volume_envelope->setStep ( 0, 0.01, 1.0 );
67 FGSimpleSound::~FGSimpleSound() {
68 delete pitch_envelope;
69 delete volume_envelope;
73 void FGSimpleSound::play( slScheduler *sched, bool looped ) {
75 // make sure sound isn't already playing
76 if ( sample->getPlayCount() > 0 ) {
77 sched->stopSample(sample);
82 sched->loopSample(sample);
84 sched->playSample(sample);
87 sched->addSampleEnvelope(sample, 0, 0, pitch_envelope, SL_PITCH_ENVELOPE);
88 sched->addSampleEnvelope(sample, 0, 1, volume_envelope, SL_VOLUME_ENVELOPE);
91 void FGSimpleSound::stop( slScheduler *sched, bool quick ) {
93 sched->stopSample( sample );
101 FGSoundMgr::FGSoundMgr() {
102 audio_sched = new slScheduler( 8000 );
103 if ( audio_sched->notWorking() ) {
104 SG_LOG( SG_GENERAL, SG_ALERT, "Audio initialization failed!" );
106 audio_sched -> setMaxConcurrent ( 6 );
108 audio_mixer = new smMixer;
110 SG_LOG( SG_GENERAL, SG_INFO,
111 "Rate = " << audio_sched->getRate()
112 << " Bps = " << audio_sched->getBps()
113 << " Stereo = " << audio_sched->getStereo() );
119 FGSoundMgr::~FGSoundMgr() {
122 // Remove the samples from the sample manager.
124 sample_map_iterator sample_current = samples.begin();
125 sample_map_iterator sample_end = samples.end();
126 for ( ; sample_current != sample_end; ++sample_current ) {
127 sample_ref *sr = sample_current->second;
133 // Remove the sounds from the sound manager.
135 sound_map_iterator sound_current = sounds.begin();
136 sound_map_iterator sound_end = sounds.end();
137 for ( ; sound_current != sound_end; ++sound_current ) {
138 FGSimpleSound *s = sound_current->second;
147 // initialize the sound manager
148 void FGSoundMgr::init() {
150 safety = FG_MAX_SOUND_SAFETY;
152 // audio_mixer -> setMasterVolume ( 80 ) ; /* 80% of max volume. */
153 audio_sched -> setSafetyMargin ( FG_SOUND_SAFETY_MULT * safety ) ;
157 // Remove the samples from the sample manager.
159 sample_map_iterator sample_current = samples.begin();
160 sample_map_iterator sample_end = samples.end();
161 for ( ; sample_current != sample_end; ++sample_current ) {
162 sample_ref *sr = sample_current->second;
169 // Remove the sounds from the sound manager.
171 sound_map_iterator sound_current = sounds.begin();
172 sound_map_iterator sound_end = sounds.end();
173 for ( ; sound_current != sound_end; ++sound_current ) {
174 FGSimpleSound *s = sound_current->second;
175 delete s->get_sample();
182 void FGSoundMgr::bind ()
187 void FGSoundMgr::unbind ()
193 // run the audio scheduler
194 void FGSoundMgr::update(int dt) {
198 double elapsed = (double)(current - last) / 1000000.0;
201 if ( elapsed > safety ) {
204 safety = safety * 0.99 + elapsed * 0.01;
206 if ( safety > FG_MAX_SOUND_SAFETY ) {
207 safety = FG_MAX_SOUND_SAFETY;
209 // cout << "safety = " << safety << endl;
210 audio_sched -> setSafetyMargin ( FG_SOUND_SAFETY_MULT * safety ) ;
212 if ( !audio_sched->not_working() )
213 audio_sched -> update();
220 audio_sched->pauseSample(0, 0);
225 FGSoundMgr::resume ()
227 audio_sched->resumeSample(0, 0);
231 // add a sound effect, return true if successful
232 bool FGSoundMgr::add( FGSimpleSound *sound, const string& refname ) {
234 sound_map_iterator sound_it = sounds.find( refname );
235 if ( sound_it != sounds.end() ) {
236 // sound already exists
240 sample_map_iterator sample_it = samples.find( refname );
241 if ( sample_it != samples.end() ) {
242 // this sound has existed in the past and it's sample is still
243 // here, delete the sample so we can replace it.
244 samples.erase( sample_it );
247 sample_ref *sr = new sample_ref;
250 sr->sample = sound->get_sample();
251 samples[refname] = sr;
253 sounds[refname] = sound;
259 // add a sound from a file, return the sample if successful, else return NULL
260 FGSimpleSound *FGSoundMgr::add( const string& refname, const string &file ) {
261 FGSimpleSound *sound;
266 sample_map_iterator it = samples.find(file);
267 if (it == samples.end()) {
268 sound = new FGSimpleSound(file);
269 sounds[refname] = sound;
271 sample_ref *sr = new sample_ref;
274 sr->sample = sound->get_sample();
278 sample_ref *sr = it->second;
282 new FGSimpleSound(sr->sample->getBuffer(), sr->sample->getLength());
283 sounds[refname] = sound;
291 // remove a sound effect, return true if successful
292 bool FGSoundMgr::remove( const string& refname ) {
294 sound_map_iterator it = sounds.find( refname );
295 if ( it != sounds.end() ) {
296 // first stop the sound from playing (so we don't bomb the
298 FGSimpleSound *sample = it->second;
300 // cout << "Playing " << sample->get_sample()->getPlayCount()
301 // << " instances!" << endl;
303 audio_sched->stopSample( sample->get_sample() );
304 audio_sched->addSampleEnvelope( sample->get_sample(), 0, 0,
307 audio_sched->addSampleEnvelope( sample->get_sample(), 0, 1,
309 SL_VOLUME_ENVELOPE );
311 // must call audio_sched->update() after stopping the sound
312 // but before deleting it.
313 audio_sched -> update();
314 // cout << "Still playing " << sample->get_sample()->getPlayCount()
315 // << " instances!" << endl;
319 // Due to the change in the sound manager, samples live
320 // until the sound manager gets removed.
325 // cout << "sndmgr: removed -> " << refname << endl;
328 // cout << "sndmgr: failed remove -> " << refname << endl;
334 // return true of the specified sound exists in the sound manager system
335 bool FGSoundMgr::exists( const string& refname ) {
336 sound_map_iterator it = sounds.find( refname );
337 if ( it != sounds.end() ) {
345 // return a pointer to the FGSimpleSound if the specified sound exists
346 // in the sound manager system, otherwise return NULL
347 FGSimpleSound *FGSoundMgr::find( const string& refname ) {
348 sound_map_iterator it = sounds.find( refname );
349 if ( it != sounds.end() ) {
357 // tell the scheduler to play the indexed sample in a continuous
359 bool FGSoundMgr::play_looped( const string& refname ) {
360 FGSimpleSound *sample;
362 if ((sample = find( refname )) == NULL)
365 sample->play(audio_sched, true);
370 // tell the scheduler to play the indexed sample once
371 bool FGSoundMgr::play_once( const string& refname ) {
372 FGSimpleSound *sample;
374 if ((sample = find( refname )) == NULL)
377 sample->play(audio_sched, false);
382 // return true of the specified sound is currently being played
383 bool FGSoundMgr::is_playing( const string& refname ) {
384 FGSimpleSound *sample;
386 if ((sample = find( refname )) == NULL)
389 return (sample->get_sample()->getPlayCount() > 0 );
393 // immediate stop playing the sound
394 bool FGSoundMgr::stop( const string& refname ) {
395 FGSimpleSound *sample;
397 if ((sample = find( refname )) == NULL)
400 audio_sched->stopSample( sample->get_sample() );