Method Initialize

modules/import-export/mod-cl/ExportCL.cpp:492–641

}

bool CLExportProcessor::Initialize(AudacityProject& project,
   const Parameters& parameters,
   const wxFileNameWrapper& fName,
   double t0, double t1, bool selectionOnly,
   double sampleRate, unsigned channels,
   MixerOptions::Downmix* mixerSpec,
   const Tags* metadata)
{
   context.t0 = t0;
   context.t1 = t1;
   context.channels = channels;

   ExtendPath ep;
   long rc;

   const auto path = fName.GetFullPath();

   context.cmd = wxString::FromUTF8(ExportPluginHelpers::GetParameterValue<std::string>(parameters, CLOptionIDCommand));
   context.showOutput = ExportPluginHelpers::GetParameterValue(parameters, CLOptionIDShowOutput, false);

   // Bug 2178 - users who don't know what they are doing will
   // now get a file extension of .wav appended to their ffmpeg filename
   // and therefore ffmpeg will be able to choose a file type.
   if( context.cmd == wxT("ffmpeg -i - \"%f\"") && !fName.HasExt())
      context.cmd.Replace( "%f", "%f.wav" );
   context.cmd.Replace(wxT("%f"), path);

   // Kick off the command
   context.process = std::make_unique<ExportCLProcess>(&context.output);
   auto& process = *context.process;

   rc = wxExecute(context.cmd, wxEXEC_ASYNC, &process);
   if (!rc) {
      process.Detach();
      process.CloseOutput();
      throw ExportException(XO("Cannot export audio to %s")
         .Format( path )
         .Translation());
   }

   // Turn off logging to prevent broken pipe messages
   wxLogNull nolog;

   // establish parameters
   int rate = lrint(sampleRate);
   const size_t maxBlockLen = 44100 * 5;
   unsigned long totalSamples = lrint((t1 - t0) * rate);
   unsigned long sampleBytes = totalSamples * channels * SAMPLE_SIZE(floatSample);

   wxOutputStream *os = process.GetOutputStream();

   // RIFF header
   struct {
      char riffID[4];            // "RIFF"
      wxUint32 riffLen;          // basically the file len - 8
      char riffType[4];          // "WAVE"
   } riff;