ImportRaw.h File Reference

#include <memory>
#include <vector>

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Typedefs
using	NewChannelGroup = std::vector< std::shared_ptr< WaveTrack > >
using	TrackHolders = std::vector< NewChannelGroup >

Functions
void	ImportRaw (const AudacityProject &project, wxWindow *parent, const wxString &fileName, WaveTrackFactory *trackFactory, TrackHolders &outTracks)

Typedef Documentation

NewChannelGroup

using NewChannelGroup = std::vector< std::shared_ptr<WaveTrack> >

Definition at line 26 of file ImportRaw.h.

TrackHolders

using TrackHolders = std::vector< NewChannelGroup >

Definition at line 27 of file ImportRaw.h.

Function Documentation

ImportRaw()

void ImportRaw	(	const AudacityProject &	project,
		wxWindow *	parent,
		const wxString &	fileName,
		WaveTrackFactory *	trackFactory,
		TrackHolders &	outTracks
	)

Definition at line 105 of file ImportRaw.cpp.

{
   outTracks.clear();
 
   TrackHolders results;
   auto updateResult = ProgressResult::Success;
 
   {
      // On first run, set default sample rate from project rate
      if (ImportRawDialog::mRate < 100.)
         ImportRawDialog::mRate = ProjectRate::Get(project).GetRate();
 
      ImportRawDialog dlog(parent, fileName);
      dlog.ShowModal();
      if (!dlog.GetReturnCode())
         return;
 
      const int encoding = dlog.mEncoding;
      unsigned numChannels = dlog.mChannels;
      double rate = dlog.mRate;
      sf_count_t offset = (sf_count_t)dlog.mOffset;
      double percent = dlog.mPercent;
 
      SF_INFO sndInfo = { 0 };
      sndInfo.samplerate = (int)rate;
      sndInfo.channels = (int)numChannels;
      sndInfo.format = encoding | SF_FORMAT_RAW;
 
      wxFile f;   // will be closed when it goes out of scope
      SFFile sndFile;
 
      if (f.Open(fileName)) {
         // Even though there is an sf_open() that takes a filename, use the one that
         // takes a file descriptor since wxWidgets can open a file with a Unicode name and
         // libsndfile can't (under Windows).
         sndFile.reset(SFCall<SNDFILE*>(sf_open_fd, f.fd(), SFM_READ, &sndInfo, FALSE));
      }
 
      if (!sndFile){
         char str[1000];
         sf_error_str((SNDFILE *)NULL, str, 1000);
         wxPrintf("%s\n", str);
 
         throw FileException{ FileException::Cause::Open, fileName };
      }
 
 
      {
         int result = sf_command(sndFile.get(), SFC_SET_RAW_START_OFFSET, &offset, sizeof(offset));
         if (result != 0) {
            char str[1000];
            sf_error_str(sndFile.get(), str, 1000);
            wxPrintf("%s\n", str);
 
            throw FileException{ FileException::Cause::Read, fileName };
         }
      }
      SFCall<sf_count_t>(sf_seek, sndFile.get(), 0, SEEK_SET);
 
      auto totalFrames =
         // fraction of a sf_count_t value
         (sampleCount)(sndInfo.frames * percent / 100.0);
 
      //
      // Sample format:
      //
      // In general, go with the user's preferences.  However, if
      // the file is higher-quality, go with a format which preserves
      // the quality of the original file.
      //
 
      const auto format = ImportFileHandle::ChooseFormat(
         sf_subtype_to_effective_format(encoding));
 
      results.resize(1);
      auto &channels = results[0];
      channels.resize(numChannels);
 
      {
         // iter not used outside this scope.
         auto iter = channels.begin();
         for (decltype(numChannels) c = 0; c < numChannels; ++iter, ++c)
            *iter = trackFactory->Create(format, rate);
      }
      const auto firstChannel = channels.begin()->get();
      auto maxBlockSize = firstChannel->GetMaxBlockSize();
 
      SampleBuffer srcbuffer(maxBlockSize * numChannels, format);
      SampleBuffer buffer(maxBlockSize, format);
 
      decltype(totalFrames) framescompleted = 0;
      if (totalFrames < 0) {
         wxASSERT(false);
         totalFrames = 0;
      }
 
      auto msg = XO("Importing %s").Format( wxFileName::FileName(fileName).GetFullName() );
 
      /* i18n-hint: 'Raw' means 'unprocessed' here and should usually be translated.*/
      ProgressDialog progress(XO("Import Raw"), msg);
 
      size_t block;
      do {
         block =
            limitSampleBufferSize( maxBlockSize, totalFrames - framescompleted );
 
         sf_count_t sf_result;
         if (format == int16Sample)
            sf_result = SFCall<sf_count_t>(sf_readf_short, sndFile.get(), (short *)srcbuffer.ptr(), block);
         else
            sf_result = SFCall<sf_count_t>(sf_readf_float, sndFile.get(), (float *)srcbuffer.ptr(), block);
 
         if (sf_result >= 0) {
            block = sf_result;
         }
         else {
            // This is not supposed to happen, sndfile.h says result is always
            // a count, not an invalid value for error
            throw FileException{ FileException::Cause::Read, fileName };
         }
 
         if (block) {
            auto iter = channels.begin();
            for(decltype(numChannels) c = 0; c < numChannels; ++iter, ++c) {
               if (format==int16Sample) {
                  for(decltype(block) j=0; j<block; j++)
                     ((short *)buffer.ptr())[j] =
                     ((short *)srcbuffer.ptr())[numChannels*j+c];
               }
               else {
                  for(decltype(block) j=0; j<block; j++)
                     ((float *)buffer.ptr())[j] =
                     ((float *)srcbuffer.ptr())[numChannels*j+c];
               }
 
               iter->get()->Append(buffer.ptr(), (format == int16Sample)?int16Sample:floatSample, block,
                  1, sf_subtype_to_effective_format(encoding));
            }
            framescompleted += block;
         }
 
         updateResult = progress.Update(
            framescompleted.as_long_long(),
            totalFrames.as_long_long()
         );
         if (updateResult != ProgressResult::Success)
            break;
         
      } while (block > 0 && framescompleted < totalFrames);
   }
 
   if (updateResult == ProgressResult::Failed || updateResult == ProgressResult::Cancelled)
      throw UserException{};
 
   if (!results.empty() && !results[0].empty()) {
      for (const auto &channel : results[0])
         channel->Flush();
      outTracks.swap(results);
   }
}

References ImportFileHandle::ChooseFormat(), WaveTrackFactory::Create(), floatSample, format, ProjectRate::Get(), ProjectRate::GetRate(), int16Sample, limitSampleBufferSize(), anonymous_namespace{StaffPadTimeAndPitch.cpp}::maxBlockSize, ImportRawDialog::mChannels, ImportRawDialog::mEncoding, ImportRawDialog::mOffset, ImportRawDialog::mPercent, ImportRawDialog::mRate, FileException::Open, SampleBuffer::ptr(), FileException::Read, sf_subtype_to_effective_format(), str, BasicUI::Success, ProgressDialog::Update(), and XO().

Referenced by anonymous_namespace{FileMenus.cpp}::DoImport().

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