OnlineSpeexDecoder Class Reference

#include <online-speex-wrapper.h>

Collaboration diagram for OnlineSpeexDecoder:

Public Member Functions
	OnlineSpeexDecoder (const SpeexOptions &config)
	~OnlineSpeexDecoder ()
void	AcceptSpeexBits (const std::vector< char > &spx_enc_bits)
void	GetWaveform (Vector< BaseFloat > *waveform)

Private Member Functions
void	Decode (const std::vector< char > &speex_char_bits, Vector< BaseFloat > *decoded_wav)

Private Attributes
int32	speex_frame_size_
int32	speex_decoded_frame_size_
SPEEXBITS	speex_bits_
Vector< BaseFloat >	waveform_
std::vector< char >	speex_bits_remainder_

Detailed Description

Definition at line 110 of file online-speex-wrapper.h.

Constructor & Destructor Documentation

OnlineSpeexDecoder()

OnlineSpeexDecoder

(

const SpeexOptions &

config

)

Definition at line 156 of file online-speex-wrapper.cc.

References KALDI_ERR, SpeexOptions::sample_rate, OnlineSpeexEncoder::speex_bits_, SpeexOptions::speex_bits_frame_size, OnlineSpeexEncoder::speex_frame_size_, SpeexOptions::speex_quality, and SpeexOptions::speex_wave_frame_size.

                                                                 {
  speex_frame_size_ = config.speex_bits_frame_size;
  speex_decoded_frame_size_ = config.speex_wave_frame_size;

  if(sizeof(speex_bits_) == 1) {
    KALDI_ERR << "OnlineSpeexEncoder called but Speex not installed."
      << "You should run tools/extras/install_speex.sh first, then "
      << "re-run configure in src/ and then make Kaldi again.\n";
  }

#ifdef HAVE_SPEEX
  speex_state_ = speex_decoder_init(&speex_wb_mode);  // init speex with wideband mode
  int32 tmp = config.speex_quality;
  speex_decoder_ctl(speex_state_, SPEEX_SET_QUALITY, &tmp);
  tmp = (int)config.sample_rate;
  speex_decoder_ctl(speex_state_, SPEEX_SET_SAMPLING_RATE, &tmp);
  speex_bits_init(&speex_bits_);
#endif
}

~OnlineSpeexDecoder()

~OnlineSpeexDecoder

(

)

Definition at line 176 of file online-speex-wrapper.cc.

References OnlineSpeexEncoder::speex_bits_.

                                        {
#ifdef HAVE_SPEEX
  speex_decoder_destroy(speex_state_);
  speex_bits_destroy(&speex_bits_);
#endif
}

Member Function Documentation

AcceptSpeexBits()

void AcceptSpeexBits

(

const std::vector< char > &

spx_enc_bits

)

Definition at line 183 of file online-speex-wrapper.cc.

References VectorBase< Real >::Dim(), and kaldi::kCopyData.

Referenced by main().

                                                                            {
  if (spx_enc_bits.size() == 0) {
    return;                 // Nothing to do
  }

  std::vector<char> appended_bits;
  const std::vector<char> &bits_to_use = (speex_bits_remainder_.size() != 0 ?
                                              appended_bits : spx_enc_bits);
  if (speex_bits_remainder_.size() != 0) {
    appended_bits.insert(appended_bits.end(), speex_bits_remainder_.begin(),
                         speex_bits_remainder_.end());
    appended_bits.insert(appended_bits.end(), spx_enc_bits.begin(),
                         spx_enc_bits.end());
  }
  speex_bits_remainder_.clear();

  Vector<BaseFloat> waveform;
  Decode(bits_to_use, &waveform);
  if (waveform.Dim() == 0) {
    // Got nothing, maybe the decode has failed
    return;
  }
  int32 last_wav_size = waveform_.Dim();
  waveform_.Resize(last_wav_size + waveform.Dim(), kCopyData);
  waveform_.Range(last_wav_size, waveform.Dim()).CopyFromVec(waveform);
}

Decode()

void Decode ( const std::vector< char > &  speex_char_bits, Vector< BaseFloat > *  decoded_wav  )

private

Definition at line 210 of file online-speex-wrapper.cc.

References VectorBase< Real >::Dim(), rnnlm::i, kaldi::kCopyData, Vector< Real >::Resize(), OnlineSpeexEncoder::speex_bits_, and OnlineSpeexEncoder::speex_frame_size_.

                                                                {
  if (speex_char_bits.size() < speex_frame_size_) {
    return;                // Nothing to do, should never reach this
  }
  decoded_wav->Resize(0);

  char *cbits = new char[speex_frame_size_ + 10]();
  BaseFloat *wav = new BaseFloat[speex_decoded_frame_size_]();
  int32 to_decode = speex_char_bits.size();
  int32 has_decode = 0;

  while(to_decode > speex_frame_size_){
    memcpy(cbits, &speex_char_bits[has_decode], speex_frame_size_);
#ifdef HAVE_SPEEX
    speex_bits_read_from(&speex_bits_, cbits, speex_frame_size_);
    speex_decode(speex_state_, &speex_bits_, wav);
#endif

    int32 dim = decoded_wav->Dim();  // expanding decoded_wav each frame
    decoded_wav->Resize(dim + speex_decoded_frame_size_, kCopyData);
    // Cannot use CopyFromPtr at this moment
    // decoded_wav->Range(dim, speex_decoded_frame_size_).
    //  CopyFromPtr(wav, speex_decoded_frame_size_);
    for (int32 i = 0; i < speex_decoded_frame_size_; i++) {
      (*decoded_wav)(i+dim) = wav[i];
    }

    has_decode += speex_frame_size_;
    to_decode  -= speex_frame_size_;
  }

  if (to_decode > 0) {
    speex_bits_remainder_.insert(speex_bits_remainder_.end(),
      speex_char_bits.begin() + has_decode, speex_char_bits.end());
  }

  delete []cbits;
  delete []wav;
}

GetWaveform()

void GetWaveform ( Vector< BaseFloat > *  waveform )

inline

Definition at line 117 of file online-speex-wrapper.h.

References Vector< Real >::Resize().

Referenced by main().

                                                  {  // call it after AcceptSpeexBits
      *waveform = waveform_;
      waveform_.Resize(0);
    }

Member Data Documentation

speex_bits_

SPEEXBITS speex_bits_

private

Definition at line 128 of file online-speex-wrapper.h.

speex_bits_remainder_

std::vector<char> speex_bits_remainder_

private

Definition at line 132 of file online-speex-wrapper.h.

speex_decoded_frame_size_

int32 speex_decoded_frame_size_

private

Definition at line 123 of file online-speex-wrapper.h.

speex_frame_size_

int32 speex_frame_size_

private

Definition at line 122 of file online-speex-wrapper.h.

waveform_

Vector<BaseFloat> waveform_

private

Definition at line 131 of file online-speex-wrapper.h.

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The documentation for this class was generated from the following files:

• online2/online-speex-wrapper.h
• online2/online-speex-wrapper.cc