Method InitCodecs

modules/import-export/mod-ffmpeg/ImportFFmpeg.cpp:362–437

}

bool FFmpegImportFileHandle::InitCodecs()
{
   for (unsigned int i = 0; i < mAVFormatContext->GetStreamsCount(); i++)
   {
      const AVStreamWrapper* stream = mAVFormatContext->GetStream(i);

      if (stream->IsAudio())
      {
         const AVCodecIDFwd id = mAVFormatContext->GetStream(i)->GetAVCodecID();

         auto codec = mFFmpeg->CreateDecoder(id);
         auto name = mFFmpeg->avcodec_get_name(id);

         if (codec == NULL)
         {
            wxLogError(
               wxT("FFmpeg : CreateDecoder() failed. Index[%02d], Codec[%02x - %s]"),
               i, id, name);
            //FFmpeg can't decode this stream, skip it
            continue;
         }

         auto codecContextPtr = stream->GetAVCodecContext();

         if ( codecContextPtr->Open( codecContextPtr->GetCodec() ) < 0 )
         {
            wxLogError(wxT("FFmpeg : Open() failed. Index[%02d], Codec[%02x - %s]"),i,id,name);
            //Can't open decoder - skip this stream
            continue;
         }

         const int channels = codecContextPtr->GetChannels();
         const sampleFormat preferredFormat =
            codecContextPtr->GetPreferredAudacitySampleFormat();

         auto codecContext = codecContextPtr.get();

         mStreamContexts.emplace_back(
            StreamContext { stream->GetIndex(), std::move(codecContextPtr),
                            channels, preferredFormat, true });

         // Stream is decodeable and it is audio. Add it and its description to the arrays
         int duration = 0;
         if (stream->GetDuration() > 0)
            duration = stream->GetDuration() * stream->GetTimeBase().num / stream->GetTimeBase().den;
         else
            duration = mAVFormatContext->GetDuration() / AUDACITY_AV_TIME_BASE;

         wxString bitrate;
         if (codecContext->GetBitRate() > 0)
            bitrate.Printf(wxT("%d"),(int)codecContext->GetBitRate());
         else
            bitrate.Printf(wxT("?"));

         AVDictionaryWrapper streamMetadata = stream->GetMetadata();

         auto lang = std::string(streamMetadata.Get("language", {}));