Ejemplo n.º 1
0
bool EffectTruncSilence::Process()
{
   SelectedTrackListOfKindIterator iter(Track::Wave, mTracks);
   WaveTrack *t;
   double t0 = mT0;
   double t1 = mT1;
   int tndx; 
   int tcount = 0;
   int fr;

   // Init using first track
   t = (WaveTrack *) iter.First();
   double rate = t->GetRate();
   sampleCount blockLen = t->GetMaxBlockSize();

   // Get the left and right bounds for all tracks
   while (t) {
      // Make sure all tracks have the same sample rate
      if (rate != t->GetRate()) {
         wxMessageBox(_("All tracks must have the same sample rate"), _("Truncate Silence"));
         return false;
      }

      // Count the tracks
      tcount++;

      // Set the current bounds to whichever left marker is
      // greater and whichever right marker is less
      t0 = wxMax(mT0, t->GetStartTime());
      t1 = wxMin(mT1, t->GetEndTime());

      // Use the smallest block size of all the tracks
      blockLen = wxMin(blockLen, t->GetMaxBlockSize());

      // Iterate to the next track
      t = (WaveTrack*) iter.Next();
   }

   // Just a sanity check, really it should be much higher
   if(blockLen < 4*mBlendFrameCount)
      blockLen = 4*mBlendFrameCount;

   // Transform the marker timepoints to samples
   t = (WaveTrack *) iter.First();
   sampleCount start = t->TimeToLongSamples(t0);
   sampleCount end = t->TimeToLongSamples(t1);

   // Bigger buffers reduce 'reset'
   //blockLen *= 8;
   // Stress-test the logic for cutting samples through block endpoints
   //blockLen /= 8;

   // Set thresholds
   // We have a lower bound on the amount of silence we chop out at a time
   // to avoid chopping up low frequency sounds.  We're good down to 10Hz
   // if we use 100ms.
   const float minTruncMs = 1.0f;
   double truncDbSilenceThreshold = Enums::Db2Signal[mTruncDbChoiceIndex];
   int truncInitialAllowedSilentSamples = 
      int((wxMax( mTruncInitialAllowedSilentMs, minTruncMs) * rate) / 1000.0);
   int truncLongestAllowedSilentSamples = 
      int((wxMax( mTruncLongestAllowedSilentMs, minTruncMs) * rate) / 1000.0);

   // Require at least 4 samples for lengths
   if(truncInitialAllowedSilentSamples < 4)
      truncInitialAllowedSilentSamples = 4;
   if(truncLongestAllowedSilentSamples < 4)
      truncLongestAllowedSilentSamples = 4;

   // If the cross-fade is longer than the minimum length,
   // then limit the cross-fade length to the minimum length
   // This allows us to have reasonable cross-fade by default
   // and still allow for 1ms minimum lengths
   if(truncInitialAllowedSilentSamples < mBlendFrameCount)
      mBlendFrameCount = truncInitialAllowedSilentSamples;
   if(truncLongestAllowedSilentSamples < mBlendFrameCount)
      mBlendFrameCount = truncLongestAllowedSilentSamples;

   // For sake of efficiency, don't let blockLen be less than double the longest silent samples
   // up until a sane limit of 1Meg samples
   while((blockLen > 0) && (blockLen < truncLongestAllowedSilentSamples*2) && (blockLen < 1048576)) {
      blockLen *= 2;
   }
    // Don't allow either value to be more than half of the block length
   if(truncLongestAllowedSilentSamples > blockLen/2)
      truncLongestAllowedSilentSamples = blockLen/2;
   if(truncInitialAllowedSilentSamples > truncLongestAllowedSilentSamples)
      truncInitialAllowedSilentSamples = truncLongestAllowedSilentSamples;

   // We use the 'longest' variable as additive to the 'initial' variable
   truncLongestAllowedSilentSamples -= truncInitialAllowedSilentSamples;

   // Perform the crossfade half-way through the minimum removed silence duration
   int rampInFrames = (truncInitialAllowedSilentSamples + mBlendFrameCount) / 2;
   if(rampInFrames > truncInitialAllowedSilentSamples)
      rampInFrames = truncInitialAllowedSilentSamples;

   // Allocate buffers
   float **buffer = new float*[tcount];
   for (tndx = 0; tndx < tcount; tndx++) {
      buffer[tndx] = new float[blockLen];
   }

   // Start processing
   //Track::All is needed because this effect has clear functionality
   this->CopyInputTracks(Track::All); // Set up mOutputTracks.
   SelectedTrackListOfKindIterator iterOut(Track::Wave, mOutputTracks);

   sampleCount index = start;
   sampleCount outTrackOffset = start;
   bool cancelled = false;
   // Reset
   bool ignoringFrames = false;
   bool truncToMinimum = true;  // Ignore the initial samples until we get above the noise floor
   sampleCount consecutiveSilentFrames = 0;
   sampleCount truncIndex = 0;
   sampleCount i = 0;
   sampleCount keep;

   while (index < end) {

      // Limit size of current block if we've reached the end
      sampleCount count = blockLen-i;
      if ((index + count) > end) {
         count = end - index; 
      }

      // Fill the buffers
      tndx = 0;
      t = (WaveTrack *) iter.First();
      while (t) {
         t->Get((samplePtr)(buffer[tndx++]+i), floatSample, index, count);
         t = (WaveTrack *) iter.Next();
      }

      // Shift over to account for samples remaining from prior block
      sampleCount limit = count+i;

      // Look for silences in current block
      for ( ; i < limit; i++) {

         // Is current frame in all tracks below threshold
         bool below = true;
         for (tndx = 0; tndx < tcount; tndx++) {
            if (fabs(buffer[tndx][i]) >= truncDbSilenceThreshold) {
               below = false;
               break;
            }
         }
         // Make sure we cross-fade and output the last silence
         // so we get a smooth transition into whatever follows the selected region
         // Also set the 'truncToMinimum' flag so that the last silence is truncated to the minimum amount
         if(below && ((index+i+1) == end)) {
            below = false;
            truncToMinimum = true;
         }

         // Count frame if it's below threshold
         if (below) {
            consecutiveSilentFrames++;

            // Ignore this frame (equivalent to cutting it)
            // otherwise, keep sample to be part of allowed silence
            if (consecutiveSilentFrames > truncInitialAllowedSilentSamples) {
               ignoringFrames = true;
               continue;
            }
         }
         else {
            if (ignoringFrames == true) {
               // Scale the consectiveSilentFrames so we keep a silence duration
               // which is proportional to the original silence up to the limit
               keep = consecutiveSilentFrames - truncInitialAllowedSilentSamples;
               keep /= mSilenceCompressRatio;

               // The first and last samples always get truncated to the minimum amount
               if(truncToMinimum == true)
                  keep = 0;
               if(keep > truncLongestAllowedSilentSamples)
                  keep = truncLongestAllowedSilentSamples;
               if(keep < 0)
                  keep = 0;

               // Compute the location of the cross-fade to be halfway through the silence
               // with restriction to the samples we still have available to use
               rampInFrames = (truncInitialAllowedSilentSamples - keep + mBlendFrameCount) / 2;
               if(rampInFrames > truncInitialAllowedSilentSamples)
                  rampInFrames = truncInitialAllowedSilentSamples;
               if(rampInFrames < mBlendFrameCount)
                  rampInFrames = mBlendFrameCount;

               // Include the cross-fade samples in the count to make the loop logic easier
               keep += rampInFrames;
               truncIndex -= rampInFrames;

               // back up for cross-fade
               sampleCount curOffset = i - keep;

               if(curOffset < 0) {
                  // This should never happen, but just in case...
                  keep += curOffset - rampInFrames;
                  if(keep < mBlendFrameCount)
                     keep = mBlendFrameCount;
                  curOffset = 0;
               }
               if(truncIndex < 0) {
                  // This should never happen, but just in case...
                  truncIndex = 0;
               }

               for (tndx = 0; tndx < tcount; tndx++) {
                  // Cross fade the cut point
                  for (fr = 0; fr < mBlendFrameCount; fr++) {
                     buffer[tndx][truncIndex+fr] = ((mBlendFrameCount-fr)*buffer[tndx][truncIndex+fr] + fr*buffer[tndx][curOffset + fr]) / mBlendFrameCount;
                  }
                  // Append the 'keep' samples, if any
                  for ( ; fr < keep; fr++) {
                     buffer[tndx][truncIndex+fr] = buffer[tndx][curOffset + fr];
                  }
               }
               truncIndex += keep;
            }
            consecutiveSilentFrames = 0;
            ignoringFrames = false;
            truncToMinimum = false;
         }

         // Can get here either because > dbThreshold
         // or silence duration isn't longer than allowed
         for (tndx = 0; tndx < tcount; tndx++) {
            buffer[tndx][truncIndex] = buffer[tndx][i];
         }
         truncIndex++;
      }

      // Update tracks if any samples were removed, now or before
      if (outTrackOffset + truncIndex != index + limit) {
         // Put updated sample back into output tracks.
         tndx = 0;
         t = (WaveTrack *) iterOut.First();
         while (t) {
            t->Set((samplePtr)buffer[tndx++], floatSample, outTrackOffset, truncIndex);
            t = (WaveTrack *) iterOut.Next();
         }
      }

      // If currently in a silent section, retain samples for the next pass
      if(ignoringFrames) {
         keep = consecutiveSilentFrames - truncInitialAllowedSilentSamples;
         if(keep > (truncLongestAllowedSilentSamples+mBlendFrameCount))
            keep = truncLongestAllowedSilentSamples+mBlendFrameCount;
         for (tndx = 0; tndx < tcount; tndx++) {
            for(fr = 0; fr < truncInitialAllowedSilentSamples; fr++) {
               buffer[tndx][fr] = buffer[tndx][truncIndex-truncInitialAllowedSilentSamples+fr];
            }
            for(fr = 0; fr < keep; fr++) {
               buffer[tndx][truncInitialAllowedSilentSamples+fr] = buffer[tndx][i-keep+fr];
            }
         }
         // Update the output index, less what we are retaining for next time
         outTrackOffset += truncIndex - truncInitialAllowedSilentSamples;
         // Append the following buffer to the existing data
         i = consecutiveSilentFrames = truncInitialAllowedSilentSamples + keep;
         truncIndex = truncInitialAllowedSilentSamples;
      } else {
         // Maintain output index
         outTrackOffset += truncIndex;
         // Reset the buffer pointers to the beginning
         i = 0;
         truncIndex = 0;
         consecutiveSilentFrames = 0;
      }

      // Update progress and bail if user cancelled
      cancelled = TrackProgress(0, ((double)index / (double)end));
      if (cancelled) {
         break;
      }

      // Bump to next block
      index += count;
   }

   AudacityProject *p = GetActiveProject();
   if (!p)
      return false;

   // Remove stale data at end of output tracks.
   if (!cancelled && (outTrackOffset < end)) {
      t = (WaveTrack *) iterOut.First();
      if( p->IsSticky() )
         t->Clear(outTrackOffset / rate, t1, mOutputTracks);
      else
         while(t) {
            t->Clear(outTrackOffset / rate, t1, mOutputTracks);
            t = (WaveTrack *) iterOut.Next();
         }         

      t1 = outTrackOffset / rate;
   }

   // Free buffers
   for (tndx = 0; tndx < tcount; tndx++) {
      delete [] buffer[tndx];
   }
   delete [] buffer;

   mT0 = t0;
   mT1 = t1;

   this->ReplaceProcessedTracks(!cancelled); 
   return !cancelled;
}
Ejemplo n.º 2
0
bool EffectChangeSpeed::Process()
{
	// Similar to EffectSoundTouch::Process()

   //Iterate over each track
   this->CopyInputWaveTracks(); // Set up mOutputWaveTracks.
   bool bGoodResult = true;

   TrackListIterator iter(mOutputWaveTracks);
   WaveTrack* pOutWaveTrack = (WaveTrack*)(iter.First());
   mCurTrackNum = 0;
	m_maxNewLength = 0.0;
	
   //Get start and end times from track
   mCurT0 = pOutWaveTrack->GetStartTime();
   mCurT1 = pOutWaveTrack->GetEndTime();

   //Set the current bounds to whichever left marker is
   //greater and whichever right marker is less:
   mCurT0 = wxMax(mT0, mCurT0);
   mCurT1 = wxMin(mT1, mCurT1);

   double len = pOutWaveTrack->GetEndTime() - pOutWaveTrack->GetStartTime();
   
   while (pOutWaveTrack != NULL)
   {
      //Get start and end times from track
      mCurT0 = pOutWaveTrack->GetStartTime();
      mCurT1 = pOutWaveTrack->GetEndTime();

      //Set the current bounds to whichever left marker is
      //greater and whichever right marker is less:
      mCurT0 = wxMax(mT0, mCurT0);
      mCurT1 = wxMin(mT1, mCurT1);

      // Process only if the right marker is to the right of the left marker
      if (mCurT1 > mCurT0) {       
         //Transform the marker timepoints to samples
         sampleCount start = pOutWaveTrack->TimeToLongSamples(mCurT0);
         sampleCount end = pOutWaveTrack->TimeToLongSamples(mCurT1);

         //ProcessOne() (implemented below) processes a single track
         if (!ProcessOne(pOutWaveTrack, start, end))
         {
            bGoodResult = false;
            break;
         }
      }
      
      //Iterate to the next track
      pOutWaveTrack = (WaveTrack*)(iter.Next());
      mCurTrackNum++;
   }

   this->ReplaceProcessedWaveTracks(bGoodResult); 

#ifdef EXPERIMENTAL_FULL_LINKING
   AudacityProject *p = (AudacityProject*)mParent;
   if( p && p->IsSticky() ){
      pOutWaveTrack = (WaveTrack*)(iter.First());
      double newLen = pOutWaveTrack->GetEndTime() - pOutWaveTrack->GetStartTime();
      double timeAdded = newLen-len;
      double sel = mCurT1-mCurT0;
      double percent = (sel/(timeAdded+sel))*100 - 100;
      if ( !(HandleGroupChangeSpeed(percent, mCurT0, mCurT1)) ) bGoodResult = false;
   }
#endif

// mT1 = mT0 + m_maxNewLength; // Update selection.

   return bGoodResult;
}