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