evozer

  "Memory mapped files work by mapping the full file into a virtual address space and then using page faults to determine which chunks to load into physical memory. In essence it allows you to access the file as if you had read the whole thing into memory, without actually doing so."

  AudioStream *AudioStreamBuilder::build() {
      AudioStream *stream = nullptr;
      if (mAudioApi == AudioApi::AAudio && isAAudioSupported()) {
          stream = new AudioStreamAAudio(*this);  

      // If unspecified, only use AAudio if recommended.
      } else if (mAudioApi == AudioApi::Unspecified && isAAudioRecommended()) {
          stream = new AudioStreamAAudio(*this);
      } else {
          if (getDirection() == oboe::Direction::Output) {
              stream = new AudioOutputStreamOpenSLES(*this);
          } else if (getDirection() == oboe::Direction::Input) {
              stream = new AudioInputStreamOpenSLES(*this);
          }
      }
      return stream;
  }  

  Result AudioStreamBuilder::openStream(AudioStream **streamPP) {
      if (streamPP == nullptr) {
          return Result::ErrorNull;
      }
      *streamPP = nullptr;
      AudioStream *streamP = build();
      if (streamP == nullptr) {
          return Result::ErrorNull;
      }
      Result result = streamP->open(); // TODO review API
      if (result == Result::OK) {
          *streamPP = streamP;
      }
      return result;
  }