Method loadFFmpegLibraryInPath

YUViewLib/src/ffmpeg/FFmpegLibraryFunctions.cpp:185–261

}

bool FFmpegLibraryFunctions::loadFFmpegLibraryInPath(QString path, LibraryVersion &libraryVersion)
{
  // We will load the following libraries (in this order):
  // avutil, swresample, avcodec, avformat.

  if (!path.isEmpty())
  {
    QDir givenPath(path);
    if (!givenPath.exists())
    {
      this->log("The given path is invalid");
      return false;
    }

    // Get the absolute path
    path = givenPath.absolutePath() + "/";
    this->log("Absolute path " + path);
  }

  // The ffmpeg libraries are named using a major version number. E.g: avutil-55.dll on windows.
  // On linux, the libraries may be named differently. On Ubuntu they are named
  // libavutil-ffmpeg.so.55. On arch linux the name is libavutil.so.55. We will try to look for both
  // namings. On MAC os (installed with homebrew), there is a link to the lib named
  // libavutil.54.dylib.
  unsigned nrNames = (is_Q_OS_LINUX) ? 2 : ((is_Q_OS_WIN) ? 1 : 1);
  bool     success = false;
  for (unsigned i = 0; i < nrNames; i++)
  {
    this->unloadAllLibraries();

    // This is how we the library name is constructed per platform
    QString constructLibName;
    if (is_Q_OS_WIN)
      constructLibName = "%1-%2";
    if (is_Q_OS_LINUX && i == 0)
      constructLibName = "lib%1-ffmpeg.so.%2";
    if (is_Q_OS_LINUX && i == 1)
      constructLibName = "lib%1.so.%2";
    if (is_Q_OS_MAC)
      constructLibName = "lib%1.%2.dylib";

    auto loadLibrary =
        [this, &constructLibName, &path](QLibrary &lib, QString libName, unsigned version) {
          auto filename = constructLibName.arg(libName).arg(version);
          lib.setFileName(path + filename);
          auto success = lib.load();
          this->log("Loading library " + filename + (success ? " succeded" : " failed"));
          return success;
        };

    if (!loadLibrary(this->libAvutil, "avutil", libraryVersion.avutil.major))
      continue;
    if (!loadLibrary(this->libSwresample, "swresample", libraryVersion.swresample.major))
      continue;
    if (!loadLibrary(this->libAvcodec, "avcodec", libraryVersion.avcodec.major))
      continue;
    if (!loadLibrary(this->libAvformat, "avformat", libraryVersion.avformat.major))
      continue;