Exemple #1
0
generic_packetizer_c *
wav_dts_demuxer_c::create_packetizer() {
  m_ptzr = new dts_packetizer_c(m_reader, m_ti, m_dtsheader);

  // .wav with DTS are always filled up with other stuff to match the bitrate.
  static_cast<dts_packetizer_c *>(m_ptzr)->set_skipping_is_normal(true);

  show_packetizer_info(0, m_ptzr);

  if (1 < verbose)
    m_dtsheader.print();

  return m_ptzr;
}
Exemple #2
0
bool
wav_dts_demuxer_c::probe(mm_io_cptr &io) {
  io->save_pos();
  int len = io->read(m_buf[m_cur_buf]->get_buffer(), DTS_READ_SIZE);
  io->restore_pos();

  if (mtx::dts::detect(m_buf[m_cur_buf]->get_buffer(), len, m_pack_14_16, m_swap_bytes)) {
    len     = decode_buffer(len);
    int pos = mtx::dts::find_consecutive_headers(m_buf[m_cur_buf]->get_buffer(), len, 5);
    if (0 <= pos) {
      if (0 > mtx::dts::find_header(m_buf[m_cur_buf]->get_buffer() + pos, len - pos, m_dtsheader))
        return false;

      m_codec.set_specialization(m_dtsheader.get_codec_specialization());

      mxverb(3, boost::format("DTSinWAV: 14->16 %1% swap %2%\n") % m_pack_14_16 % m_swap_bytes);
      return true;
    }
  }

  return false;
}
Exemple #3
0
memory_cptr
dts_packetizer_c::get_dts_packet(mtx::dts::header_t &dtsheader,
                                 bool flushing) {
  if (0 == m_packet_buffer.get_size())
    return nullptr;

  const unsigned char *buf = m_packet_buffer.get_buffer();
  int buf_size             = m_packet_buffer.get_size();
  int pos                  = mtx::dts::find_sync_word(buf, buf_size);

  if (0 > pos) {
    if (4 < buf_size)
      m_packet_buffer.remove(buf_size - 4);
    return nullptr;
  }

  if (0 < pos) {
    m_packet_buffer.remove(pos);
    buf      = m_packet_buffer.get_buffer();
    buf_size = m_packet_buffer.get_size();
  }

  pos = mtx::dts::find_header(buf, buf_size, dtsheader, flushing);

  if ((0 > pos) || (static_cast<int>(pos + dtsheader.frame_byte_size) > buf_size))
    return nullptr;

  if ((1 < verbose) && (dtsheader != m_previous_header)) {
    mxinfo(Y("DTS header information changed! - New format:\n"));
    dtsheader.print();
    m_previous_header = dtsheader;
  }

  if (verbose && (0 < pos) && !m_skipping_is_normal) {
    int i;
    bool all_zeroes = true;

    for (i = 0; i < pos; ++i)
      if (buf[i]) {
        all_zeroes = false;
        break;
      }

    if (!all_zeroes)
      mxwarn_tid(m_ti.m_fname, m_ti.m_id, boost::format(Y("Skipping %1% bytes (no valid DTS header found). This might cause audio/video desynchronisation.\n")) % pos);
  }

  auto bytes_to_remove = pos + dtsheader.frame_byte_size;

  if (   m_reduce_to_core
      && dtsheader.has_core
      && dtsheader.has_exss
      && (dtsheader.exss_part_size > 0)
      && (dtsheader.exss_part_size < static_cast<int>(dtsheader.frame_byte_size))) {
    dtsheader.frame_byte_size -= dtsheader.exss_part_size;
    dtsheader.has_exss         = false;
  }

  auto packet_buf = memory_c::clone(buf + pos, dtsheader.frame_byte_size);

  m_packet_buffer.remove(bytes_to_remove);

  return packet_buf;
}