src/Sound/VoiceSynthesizer.cxx

   1 /*
   2  * VoiceSynthesizer.cxx
   3  *
   4  *  Created on: Apr 24, 2014
   5  *      Author: flightgear
   6  */
   7
   8 #include "VoiceSynthesizer.hxx"
   9 #include <Main/globals.hxx>
  10 #include <Main/fg_props.hxx>
  11 #include <simgear/debug/logstream.hxx>
  12 #include <simgear/sound/readwav.hxx>
  13 #include <simgear/misc/sg_path.hxx>
  14 #include <OpenThreads/Thread>
  15 #include <flite_hts_engine.h>
  16
  17 class ScopedTempfile {
  18 public:
  19   ScopedTempfile( bool keep = false ) : _keep(keep)
  20   {
  21     _name = ::tempnam(globals->get_fg_home().c_str(), "fgvox");
  22
  23   }
  24   ~ScopedTempfile()
  25   {
  26     if (_name && !_keep) ::unlink(_name);
  27     ::free(_name);
  28   }
  29
  30   const char * getName() const
  31   {
  32     return _name;
  33   }
  34   SGPath getPath()
  35   {
  36     return SGPath(_name);
  37   }
  38 private:
  39   char * _name;
  40   bool _keep;
  41 };
  42
  43 class FLITEVoiceSynthesizer::WorkerThread: public OpenThreads::Thread {
  44 public:
  45   WorkerThread(FLITEVoiceSynthesizer * synthesizer)
  46       : _synthesizer(synthesizer)
  47   {
  48   }
  49   virtual void run();
  50 private:
  51   FLITEVoiceSynthesizer * _synthesizer;
  52 };
  53
  54 void FLITEVoiceSynthesizer::WorkerThread::run()
  55 {
  56   for (;;) {
  57     SynthesizeRequest request = _synthesizer->_requests.pop();
  58     if ( NULL != request.listener) {
  59       SGSharedPtr<SGSoundSample> sample = _synthesizer->synthesize(request.text);
  60       request.listener->SoundSampleReady( sample );
  61     }
  62   }
  63 }
  64
  65 void FLITEVoiceSynthesizer::synthesize( SynthesizeRequest & request)
  66 {
  67   _requests.push(request);
  68 }
  69
  70 FLITEVoiceSynthesizer::FLITEVoiceSynthesizer(const std::string & voice)
  71     : _engine(new Flite_HTS_Engine), _worker(new FLITEVoiceSynthesizer::WorkerThread(this)), _volume(6.0), _keepScratchFile(false)
  72 {
  73   _volume = fgGetDouble("/sim/sound/voice-synthesizer/volume", _volume );
  74   _keepScratchFile = fgGetBool("/sim/sound/voice-synthesizer/keep-scratch-file", _keepScratchFile);
  75   Flite_HTS_Engine_initialize(_engine);
  76   Flite_HTS_Engine_load(_engine, voice.c_str());
  77   _worker->start();
  78 }
  79
  80 FLITEVoiceSynthesizer::~FLITEVoiceSynthesizer()
  81 {
  82   _worker->cancel();
  83   _worker->join();
  84   Flite_HTS_Engine_clear(_engine);
  85 }
  86
  87 SGSoundSample * FLITEVoiceSynthesizer::synthesize(const std::string & text)
  88 {
  89   ScopedTempfile scratch(_keepScratchFile);
  90   HTS_Engine_set_volume( &_engine->engine, _volume );
  91
  92   if ( FALSE == Flite_HTS_Engine_synthesize(_engine, text.c_str(), scratch.getName())) return NULL;
  93
  94   SG_LOG(SG_SOUND, SG_ALERT, "created wav at " << scratch.getPath());
  95
  96   ALenum format;
  97   ALsizei size;
  98   ALfloat freqf;
  99   ALvoid * data = simgear::loadWAVFromFile(scratch.getPath(), format, size, freqf);
 100   SG_LOG(SG_ALL, SG_ALERT, "loaded wav at " << freqf << "Hz size=" << size << " format=" << format);
 101
 102   if (data == NULL) {
 103     SG_LOG(SG_SOUND, SG_ALERT, "Failed to load wav file " << scratch.getPath());
 104   }
 105
 106   if (format == AL_FORMAT_STEREO8 || format == AL_FORMAT_STEREO16) {
 107     free(data);
 108     SG_LOG(SG_SOUND, SG_ALERT, "Warning: STEREO files are not supported for 3D audio effects: " << scratch.getPath());
 109   }
 110
 111   return new SGSoundSample(&data, size, (ALsizei) freqf, format);
 112 }
 113