text: 
  /*****************************************************************************
   * mkv.cpp : matroska demuxer
   *****************************************************************************
   * Copyright (C) 2003-2004 VLC authors and VideoLAN
   * $Id: 2cb6e90082cb0715c2ec8be707bb6675ccdc3333 $
   *
   * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   *          Steve Lhomme <steve.lhomme@free.fr>
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
   * GNU Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public License
   * along with this program; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
   *****************************************************************************/
  
  #include "mkv.hpp"
  
  #ifdef HAVE_ZLIB_H
  int32_t zlib_decompress_extra( demux_t * p_demux, mkv_track_t & tk );
  block_t *block_zlib_decompress( vlc_object_t *p_this, block_t *p_in_block );
  #endif
  
  block_t *MemToBlock( uint8_t *p_mem, size_t i_mem, size_t offset);
  void handle_real_audio(demux_t * p_demux, mkv_track_t * p_tk, block_t * p_blk, mtime_t i_pts);
  block_t *WEBVTT_Repack_Sample(block_t *p_block, bool b_webm = false,
                                const uint8_t * = NULL, size_t = 0);
  void send_Block( demux_t * p_demux, mkv_track_t * p_tk, block_t * p_block, unsigned int i_number_frames, mtime_t i_duration );
  
  
  struct real_audio_private
  {
      uint32_t fourcc;
      uint16_t version;
      uint16_t unknown1;
      uint8_t  unknown2[12];
      uint16_t unknown3;
      uint16_t flavor;
      uint32_t coded_frame_size;
      uint32_t unknown4[3];
      uint16_t sub_packet_h;
      uint16_t frame_size;
      uint16_t sub_packet_size;
      uint16_t unknown5;
  };
  
  struct real_audio_private_v4
  {
      real_audio_private header;
      uint16_t sample_rate;
      uint16_t unknown;
      uint16_t sample_size;
      uint16_t channels;
  };
  
  
  struct real_audio_private_v5
  {
      real_audio_private header;
      uint32_t unknown1;
      uint16_t unknown2;
      uint16_t sample_rate;
      uint16_t unknown3;
      uint16_t sample_size;
      uint16_t channels;
  };
  
  class Cook_PrivateTrackData : public PrivateTrackData
  {
  public:
      Cook_PrivateTrackData(uint16_t sph, uint16_t fs, uint16_t sps):
          i_sub_packet_h(sph), i_frame_size(fs), i_subpacket_size(sps),
          p_subpackets(NULL), i_subpackets(0), i_subpacket(0){}
      ~Cook_PrivateTrackData();
      int32_t Init();
  
      uint16_t i_sub_packet_h;
      uint16_t i_frame_size;
      uint16_t i_subpacket_size;
      block_t  **p_subpackets;
      size_t   i_subpackets;
      size_t   i_subpacket;
  };
  
  block_t * packetize_wavpack( const mkv_track_t &, uint8_t *, size_t);
  
  /* helper functions to print the mkv parse tree */
  void MkvTree_va( demux_t& demuxer, int i_level, const char* fmt, va_list args);
  void MkvTree( demux_t & demuxer, int i_level, const char *psz_format, ... );
  