/*
   mkvmerge -- utility for splicing together matroska files
   from component media subtypes

   Distributed under the GPL v2
   see the file COPYING for details
   or visit http://www.gnu.org/copyleft/gpl.html

   FLAC packetizer

   Written by Moritz Bunkus <moritz@bunkus.org>.
*/

#include "common/common_pch.h"

#if defined(HAVE_FLAC_FORMAT_H)

#include <ogg/ogg.h>
#include <vorbis/codec.h>

#include "common/checksums/base.h"
#include "common/codec.h"
#include "common/flac.h"
#include "merge/connection_checks.h"
#include "output/p_flac.h"

using namespace libmatroska;

flac_packetizer_c::flac_packetizer_c(generic_reader_c *p_reader,
                                     track_info_c &p_ti,
                                     unsigned char *header,
                                     int l_header)
  : generic_packetizer_c(p_reader, p_ti)
  , m_header{memory_c::clone(header, l_header)}
{
  int result;

  if ((4 > l_header) || memcmp(header, "fLaC", 4)) {
    m_header->resize(l_header + 4);
    memcpy(m_header->get_buffer(),     "fLaC", 4);
    memcpy(m_header->get_buffer() + 4, header, l_header);
  }


  result = mtx::flac::decode_headers(m_header->get_buffer(), m_header->get_size(), 1, FLAC_HEADER_STREAM_INFO, &m_stream_info);
  if (!(result & FLAC_HEADER_STREAM_INFO))
    mxerror_tid(m_ti.m_fname, m_ti.m_id, Y("The FLAC headers could not be parsed: the stream info structure was not found.\n"));

  set_track_type(track_audio);
  if (m_stream_info.min_blocksize == m_stream_info.max_blocksize)
    set_track_default_duration((int64_t)(1000000000ll * m_stream_info.min_blocksize / m_stream_info.sample_rate));
}

flac_packetizer_c::~flac_packetizer_c() {
}

void
flac_packetizer_c::set_headers() {
  set_codec_id(MKV_A_FLAC);
  set_codec_private(m_header);
  set_audio_sampling_freq((float)m_stream_info.sample_rate);
  set_audio_channels(m_stream_info.channels);
  set_audio_bit_depth(m_stream_info.bits_per_sample);

  generic_packetizer_c::set_headers();
}

int
flac_packetizer_c::process(packet_cptr packet) {
  m_num_packets++;

  packet->duration = mtx::flac::get_num_samples(packet->data->get_buffer(), packet->data->get_size(), m_stream_info);

  if (-1 == packet->duration) {
    mxwarn_tid(m_ti.m_fname, m_ti.m_id, fmt::format(Y("Packet number {0} contained an invalid FLAC header and is being skipped.\n"), m_num_packets));
    return FILE_STATUS_MOREDATA;
  }

  packet->duration = packet->duration * 1000000000ll / m_stream_info.sample_rate;
  add_packet(packet);

  return FILE_STATUS_MOREDATA;
}

connection_result_e
flac_packetizer_c::can_connect_to(generic_packetizer_c *src,
                                  std::string &error_message) {
  flac_packetizer_c *fsrc = dynamic_cast<flac_packetizer_c *>(src);
  if (!fsrc)
    return CAN_CONNECT_NO_FORMAT;

  connect_check_a_samplerate(m_stream_info.sample_rate, fsrc->m_stream_info.sample_rate);
  connect_check_a_channels(m_stream_info.channels, fsrc->m_stream_info.channels);
  connect_check_a_bitdepth(m_stream_info.bits_per_sample, fsrc->m_stream_info.bits_per_sample);

  if (   (m_header->get_size() != fsrc->m_header->get_size())
      || !m_header
      || !fsrc->m_header
      || memcmp(m_header->get_buffer(), fsrc->m_header->get_buffer(), m_header->get_size())) {
    error_message = fmt::format(Y("The codec's private data does not match (lengths: {0} and {1})."), m_header->get_size(), fsrc->m_header->get_size());
    return CAN_CONNECT_MAYBE_CODECPRIVATE;
  }

  return CAN_CONNECT_YES;
}
#endif
