void
ac3_packetizer_c::adjust_header_values(ac3::frame_c const &ac3_header) {
if (!m_first_packet)
return;
if (m_first_ac3_header.m_sample_rate != ac3_header.m_sample_rate)
set_audio_sampling_freq((float)ac3_header.m_sample_rate);
if (m_first_ac3_header.m_channels != ac3_header.m_channels)
set_audio_channels(ac3_header.m_channels);
if (ac3_header.is_eac3())
set_codec_id(MKV_A_EAC3);
if ((m_samples_per_packet != ac3_header.m_samples) || (m_first_ac3_header.m_sample_rate != ac3_header.m_sample_rate)) {
if (ac3_header.m_sample_rate)
m_timecode_calculator.set_samples_per_second(ac3_header.m_sample_rate);
if (ac3_header.m_samples)
m_samples_per_packet = ac3_header.m_samples;
m_packet_duration = m_timecode_calculator.get_duration(m_samples_per_packet).to_ns();
set_track_default_duration(m_packet_duration);
}
m_first_ac3_header = ac3_header;
rerender_track_headers();
}
bool
wav_ac3acm_demuxer_c::probe(mm_io_cptr &io) {
io->save_pos();
int len = io->read(m_buf[m_cur_buf]->get_buffer(), AC3ACM_READ_SIZE);
io->restore_pos();
ac3::parser_c parser;
int pos = parser.find_consecutive_frames(m_buf[m_cur_buf]->get_buffer(), len, 4);
if (-1 == pos) {
m_swap_bytes = true;
decode_buffer(len);
pos = parser.find_consecutive_frames(m_buf[m_cur_buf]->get_buffer(), len, 4);
}
if (-1 == pos)
return false;
return m_ac3header.decode_header(m_buf[m_cur_buf]->get_buffer() + pos, len - pos);
}
virtual std::string get_codec() {
return m_ac3header.is_eac3() ? "EAC3" : "AC3";
};