C++ (Cpp) ScanForMetadata 예제들

예제 #1

파일: MoofParser.cpp 프로젝트: carriercomm/system-addons

already_AddRefed<mozilla::MediaByteBuffer>
MoofParser::Metadata()
{
  MediaByteRange ftyp;
  MediaByteRange moov;
  ScanForMetadata(ftyp, moov);
  if (!ftyp.Length() || !moov.Length()) {
    return nullptr;
  }
  RefPtr<MediaByteBuffer> metadata = new MediaByteBuffer();
  if (!metadata->SetLength(ftyp.Length() + moov.Length(), fallible)) {
    // OOM
    return nullptr;
  }

  RefPtr<mp4_demuxer::BlockingStream> stream = new BlockingStream(mSource);
  size_t read;
  bool rv =
    stream->ReadAt(ftyp.mStart, metadata->Elements(), ftyp.Length(), &read);
  if (!rv || read != ftyp.Length()) {
    return nullptr;
  }
  rv =
    stream->ReadAt(moov.mStart, metadata->Elements() + ftyp.Length(), moov.Length(), &read);
  if (!rv || read != moov.Length()) {
    return nullptr;
  }
  return metadata.forget();
}

예제 #2

파일: MoofParser.cpp 프로젝트: luke-chang/gecko-1

already_AddRefed<mozilla::MediaByteBuffer>
MoofParser::Metadata()
{
  MediaByteRange moov;
  ScanForMetadata(moov);
  CheckedInt<MediaByteBuffer::size_type> moovLength = moov.Length();
  if (!moovLength.isValid() || !moovLength.value()) {
    // No moov, or cannot be used as array size.
    return nullptr;
  }

  RefPtr<MediaByteBuffer> metadata = new MediaByteBuffer();
  if (!metadata->SetLength(moovLength.value(), fallible)) {
    LOG(Moof, "OOM");
    return nullptr;
  }

  RefPtr<BlockingStream> stream = new BlockingStream(mSource);
  size_t read;
  bool rv =
    stream->ReadAt(moov.mStart, metadata->Elements(), moovLength.value(), &read);
  if (!rv || read != moovLength.value()) {
    return nullptr;
  }
  return metadata.forget();
}

예제 #3

파일: MoofParser.cpp 프로젝트: carriercomm/system-addons

bool
MoofParser::HasMetadata()
{
  MediaByteRange ftyp;
  MediaByteRange moov;
  ScanForMetadata(ftyp, moov);
  return !!ftyp.Length() && !!moov.Length();
}

예제 #4

파일: MoofParser.cpp 프로젝트: MichaelKohler/gecko-dev

already_AddRefed<mozilla::MediaByteBuffer>
MoofParser::Metadata()
{
  MediaByteRange ftyp;
  MediaByteRange moov;
  ScanForMetadata(ftyp, moov);
  CheckedInt<MediaByteBuffer::size_type> ftypLength = ftyp.Length();
  CheckedInt<MediaByteBuffer::size_type> moovLength = moov.Length();
  if (!ftypLength.isValid() || !moovLength.isValid()
      || !ftypLength.value() || !moovLength.value()) {
    // No ftyp or moov, or they cannot be used as array size.
    return nullptr;
  }
  CheckedInt<MediaByteBuffer::size_type> totalLength = ftypLength + moovLength;
  if (!totalLength.isValid()) {
    // Addition overflow, or sum cannot be used as array size.
    return nullptr;
  }
  RefPtr<MediaByteBuffer> metadata = new MediaByteBuffer();
  if (!metadata->SetLength(totalLength.value(), fallible)) {
    // OOM
    return nullptr;
  }

  RefPtr<mp4_demuxer::BlockingStream> stream = new BlockingStream(mSource);
  size_t read;
  bool rv =
    stream->ReadAt(ftyp.mStart, metadata->Elements(), ftypLength.value(), &read);
  if (!rv || read != ftypLength.value()) {
    return nullptr;
  }
  rv =
    stream->ReadAt(moov.mStart, metadata->Elements() + ftypLength.value(), moovLength.value(), &read);
  if (!rv || read != moovLength.value()) {
    return nullptr;
  }
  return metadata.forget();
}