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;
}
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;
}
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;
}
