text: /*
   * MXF muxer
   * Copyright (c) 2008 GUCAS, Zhentan Feng <spyfeng at gmail dot com>
   * Copyright (c) 2008 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
   *
   * This file is part of FFmpeg.
   *
   * FFmpeg 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.
   *
   * FFmpeg 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 FFmpeg; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  /*
   * References
   * SMPTE 336M KLV Data Encoding Protocol Using Key-Length-Value
   * SMPTE 377M MXF File Format Specifications
   * SMPTE 379M MXF Generic Container
   * SMPTE 381M Mapping MPEG Streams into the MXF Generic Container
   * SMPTE RP210: SMPTE Metadata Dictionary
   * SMPTE RP224: Registry of SMPTE Universal Labels
   */
  
  //#define DEBUG
  
  #include <math.h>
  #include <time.h>
  
  #include "libavutil/random_seed.h"
  #include "libavcodec/bytestream.h"
  #include "audiointerleave.h"
  #include "avformat.h"
  #include "mxf.h"
  
  static const int NTSC_samples_per_frame[] = { 1602, 1601, 1602, 1601, 1602, 0 };
  static const int PAL_samples_per_frame[]  = { 1920, 0 };
  
  extern AVOutputFormat ff_mxf_d10_muxer;
  
  #define EDIT_UNITS_PER_BODY 250
  #define KAG_SIZE 512
  
  typedef struct {
      int local_tag;
      UID uid;
  } MXFLocalTagPair;
  
  typedef struct {
      uint8_t flags;
      uint64_t offset;
      unsigned slice_offset; ///< offset of audio slice
      uint16_t temporal_ref;
  } MXFIndexEntry;
  
  typedef struct {
      AudioInterleaveContext aic;
      UID track_essence_element_key;
      int index;               ///< index in mxf_essence_container_uls table
      const UID *codec_ul;
      int order;               ///< interleaving order if dts are equal
      int interlaced;          ///< wether picture is interlaced
      int temporal_reordering;
      AVRational aspect_ratio; ///< display aspect ratio
      int closed_gop;          ///< gop is closed, used in mpeg-2 frame parsing
  } MXFStreamContext;
  
  typedef struct {
      UID container_ul;
      UID element_ul;
      UID codec_ul;
      void (*write_desc)(AVFormatContext *, AVStream *);
  } MXFContainerEssenceEntry;
  
  static const struct {
      enum CodecID id;
      int index;
  } mxf_essence_mappings[] = {
      { CODEC_ID_MPEG2VIDEO, 0 },
      { CODEC_ID_PCM_S24LE,  1 },
      { CODEC_ID_PCM_S16LE,  1 },
      { CODEC_ID_NONE }
  };
  
  static void mxf_write_wav_desc(AVFormatContext *s, AVStream *st);
  static void mxf_write_aes3_desc(AVFormatContext *s, AVStream *st);
  static void mxf_write_mpegvideo_desc(AVFormatContext *s, AVStream *st);
  static void mxf_write_cdci_desc(AVFormatContext *s, AVStream *st);
  static void mxf_write_generic_sound_desc(AVFormatContext *s, AVStream *st);
  
  static const MXFContainerEssenceEntry mxf_essence_container_uls[] = {
      { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 },
        { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x15,0x01,0x05,0x00 },
        { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x00,0x00,0x00 },
        mxf_write_mpegvideo_desc },
      { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x03,0x00 },
        { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x16,0x01,0x03,0x00 },
        { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },
        mxf_write_aes3_desc },
      { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 },
        { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x16,0x01,0x01,0x00 },
        { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },
        mxf_write_wav_desc },
      // D-10 625/50 PAL 50mb/s
      { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 },
        { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x05,0x01,0x01,0x00 },
        { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x01 },
        mxf_write_cdci_desc },
      { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 },
        { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x06,0x01,0x10,0x00 },
        { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },
        mxf_write_generic_sound_desc },
      // D-10 525/60 NTSC 50mb/s
      { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x02,0x01 },
        { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x05,0x01,0x01,0x00 },
        { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x02 },
        mxf_write_cdci_desc },
      { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x02,0x01 },
        { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x06,0x01,0x10,0x00 },
        { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },
        mxf_write_generic_sound_desc },
      // D-10 625/50 PAL 40mb/s
      { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x03,0x01 },
        { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x05,0x01,0x01,0x00 },
        { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x03 },
        mxf_write_cdci_desc },
      { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x03,0x01 },
        { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x06,0x01,0x10,0x00 },
        { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },
        mxf_write_generic_sound_desc },
      // D-10 525/60 NTSC 40mb/s
      { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x04,0x01 },
        { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x05,0x01,0x01,0x00 },
        { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x04 },
        mxf_write_cdci_desc },
      { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x04,0x01 },
        { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x06,0x01,0x10,0x00 },
        { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },
        mxf_write_generic_sound_desc },
      // D-10 625/50 PAL 30mb/s
      { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x05,0x01 },
        { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x05,0x01,0x01,0x00 },
        { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x05 },
        mxf_write_cdci_desc },
      { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x05,0x01 },
        { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x06,0x01,0x10,0x00 },
        { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },
        mxf_write_generic_sound_desc },
      // D-10 525/60 NTSC 30mb/s
      { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x06,0x01 },
        { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x05,0x01,0x01,0x00 },
        { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x06 },
        mxf_write_cdci_desc },
      { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x06,0x01 },
        { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x06,0x01,0x10,0x00 },
        { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },
        mxf_write_generic_sound_desc },
      { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },
        { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },
        { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },
        NULL },
  };
  
  typedef struct MXFContext {
      int64_t footer_partition_offset;
      int essence_container_count;
      AVRational time_base;
      int header_written;
      MXFIndexEntry *index_entries;
      unsigned edit_units_count;
      uint64_t timestamp;   ///< timestamp, as year(16),month(8),day(8),hour(8),minutes(8),msec/4(8)
      uint8_t slice_count;  ///< index slice count minus 1 (1 if no audio, 0 otherwise)
      int last_indexed_edit_unit;
      uint64_t *body_partition_offset;
      unsigned body_partitions_count;
      int last_key_index;  ///< index of last key frame
      uint64_t duration;
      AVStream *timecode_track;
      int timecode_base;       ///< rounded time code base (25 or 30)
      int timecode_start;      ///< frame number computed from mpeg-2 gop header timecode
      int timecode_drop_frame; ///< time code use drop frame method frop mpeg-2 essence gop header
      int edit_unit_byte_count; ///< fixed edit unit byte count
      uint64_t body_offset;
      uint32_t instance_number;
      uint8_t umid[16];        ///< unique material identifier
  } MXFContext;
  
  static const uint8_t uuid_base[]            = { 0xAD,0xAB,0x44,0x24,0x2f,0x25,0x4d,0xc7,0x92,0xff,0x29,0xbd };
  static const uint8_t umid_ul[]              = { 0x06,0x0A,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x01,0x0D,0x00,0x13 };
  
  /**
   * complete key for operation pattern, partitions, and primer pack
   */
  static const uint8_t op1a_ul[]                     = { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x01,0x09,0x00 };
  static const uint8_t footer_partition_key[]        = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }; // ClosedComplete
  static const uint8_t primer_pack_key[]             = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x05,0x01,0x00 };
  static const uint8_t index_table_segment_key[]     = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 };
  static const uint8_t random_index_pack_key[]       = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x11,0x01,0x00 };
  static const uint8_t header_open_partition_key[]   = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }; // OpenIncomplete
  static const uint8_t header_closed_partition_key[] = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }; // ClosedComplete
  static const uint8_t klv_fill_key[]                = { 0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x03,0x01,0x02,0x10,0x01,0x00,0x00,0x00 };
  static const uint8_t body_partition_key[]          = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }; // ClosedComplete
  
  /**
   * partial key for header metadata
   */
  static const uint8_t header_metadata_key[]  = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0D,0x01,0x01,0x01,0x01 };
  static const uint8_t multiple_desc_ul[]     = { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x0D,0x01,0x03,0x01,0x02,0x7F,0x01,0x00 };
  
  /**
   * SMPTE RP210 http://www.smpte-ra.org/mdd/index.html
   */
  static const MXFLocalTagPair mxf_local_tag_batch[] = {
      // preface set
      { 0x3C0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x01,0x01,0x15,0x02,0x00,0x00,0x00,0x00}}, /* Instance UID */
      { 0x3B02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x02,0x04,0x00,0x00}}, /* Last Modified Date */
      { 0x3B05, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x03,0x01,0x02,0x01,0x05,0x00,0x00,0x00}}, /* Version */
      { 0x3B06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x06,0x04,0x00,0x00}}, /* Identifications reference */
      { 0x3B03, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x02,0x01,0x00,0x00}}, /* Content Storage reference */
      { 0x3B09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x02,0x02,0x03,0x00,0x00,0x00,0x00}}, /* Operational Pattern UL */
      { 0x3B0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x02,0x02,0x10,0x02,0x01,0x00,0x00}}, /* Essence Containers UL batch */
      { 0x3B0B, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x02,0x02,0x10,0x02,0x02,0x00,0x00}}, /* DM Schemes UL batch */
      // Identification
      { 0x3C09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x01,0x00,0x00,0x00}}, /* This Generation UID */
      { 0x3C01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x02,0x01,0x00,0x00}}, /* Company Name */
      { 0x3C02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x03,0x01,0x00,0x00}}, /* Product Name */
      { 0x3C04, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x05,0x01,0x00,0x00}}, /* Version String */
      { 0x3C05, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x07,0x00,0x00,0x00}}, /* Product ID */
      { 0x3C06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x02,0x03,0x00,0x00}}, /* Modification Date */
      // Content Storage
      { 0x1901, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x05,0x01,0x00,0x00}}, /* Package strong reference batch */
      { 0x1902, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x05,0x02,0x00,0x00}}, /* Package strong reference batch */
      // Essence Container Data
      { 0x2701, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x06,0x01,0x00,0x00,0x00}}, /* Linked Package UID */
      { 0x3F07, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x01,0x03,0x04,0x04,0x00,0x00,0x00,0x00}}, /* BodySID */
      // Package
      { 0x4401, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x01,0x01,0x15,0x10,0x00,0x00,0x00,0x00}}, /* Package UID */
      { 0x4405, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x01,0x03,0x00,0x00}}, /* Package Creation Date */
      { 0x4404, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x02,0x05,0x00,0x00}}, /* Package Modified Date */
      { 0x4403, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x06,0x05,0x00,0x00}}, /* Tracks Strong reference array */
      { 0x4701, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x02,0x03,0x00,0x00}}, /* Descriptor */
      // Track
      { 0x4801, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x01,0x07,0x01,0x01,0x00,0x00,0x00,0x00}}, /* Track ID */
      { 0x4804, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x01,0x04,0x01,0x03,0x00,0x00,0x00,0x00}}, /* Track Number */
      { 0x4B01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x30,0x04,0x05,0x00,0x00,0x00,0x00}}, /* Edit Rate */
      { 0x4B02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x03,0x01,0x03,0x00,0x00}}, /* Origin */
      { 0x4803, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x02,0x04,0x00,0x00}}, /* Sequence reference */
      // Sequence
      { 0x0201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x07,0x01,0x00,0x00,0x00,0x00,0x00}}, /* Data Definition UL */
      { 0x0202, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x02,0x01,0x01,0x03,0x00,0x00}}, /* Duration */
      { 0x1001, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x06,0x09,0x00,0x00}}, /* Structural Components reference array */
      // Source Clip
      { 0x1201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x03,0x01,0x04,0x00,0x00}}, /* Start position */
      { 0x1101, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x03,0x01,0x00,0x00,0x00}}, /* SourcePackageID */
      { 0x1102, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x03,0x02,0x00,0x00,0x00}}, /* SourceTrackID */
      // Timecode Component
      { 0x1501, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x03,0x01,0x05,0x00,0x00}}, /* Start Time Code */
      { 0x1502, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x04,0x01,0x01,0x02,0x06,0x00,0x00}}, /* Rounded Time Code Base */
      { 0x1503, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x04,0x01,0x01,0x05,0x00,0x00,0x00}}, /* Drop Frame */
      // File Descriptor
      { 0x3F01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x06,0x01,0x01,0x04,0x06,0x0B,0x00,0x00}}, /* Sub Descriptors reference array */
      { 0x3006, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x06,0x01,0x01,0x03,0x05,0x00,0x00,0x00}}, /* Linked Track ID */
      { 0x3001, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x06,0x01,0x01,0x00,0x00,0x00,0x00}}, /* SampleRate */
      { 0x3004, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x01,0x02,0x00,0x00}}, /* Essence Container */
      // Generic Picture Essence Descriptor
      { 0x320C, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x03,0x01,0x04,0x00,0x00,0x00}}, /* Frame Layout */
      { 0x320D, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x01,0x03,0x02,0x05,0x00,0x00,0x00}}, /* Video Line Map */
      { 0x3203, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x02,0x02,0x00,0x00,0x00}}, /* Stored Width */
      { 0x3202, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x02,0x01,0x00,0x00,0x00}}, /* Stored Height */
      { 0x3209, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x01,0x0C,0x00,0x00,0x00}}, /* Display Width */
      { 0x3208, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x01,0x0B,0x00,0x00,0x00}}, /* Display Height */
      { 0x320E, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x01,0x01,0x01,0x00,0x00,0x00}}, /* Aspect Ratio */
      { 0x3201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x01,0x06,0x01,0x00,0x00,0x00,0x00}}, /* Picture Essence Coding */
      // CDCI Picture Essence Descriptor
      { 0x3301, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x01,0x05,0x03,0x0A,0x00,0x00,0x00}}, /* Component Depth */
      { 0x3302, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x01,0x05,0x00,0x00,0x00}}, /* Horizontal Subsampling */
      // Generic Sound Essence Descriptor
      { 0x3D02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x04,0x02,0x03,0x01,0x04,0x00,0x00,0x00}}, /* Locked/Unlocked */
      { 0x3D03, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x03,0x01,0x01,0x01,0x00,0x00}}, /* Audio sampling rate */
      { 0x3D07, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x01,0x01,0x04,0x00,0x00,0x00}}, /* ChannelCount */
      { 0x3D01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x04,0x02,0x03,0x03,0x04,0x00,0x00,0x00}}, /* Quantization bits */
      { 0x3D06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x02,0x04,0x02,0x00,0x00,0x00,0x00}}, /* Sound Essence Compression */
      // Index Table Segment
      { 0x3F0B, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x05,0x30,0x04,0x06,0x00,0x00,0x00,0x00}}, /* Index Edit Rate */
      { 0x3F0C, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x07,0x02,0x01,0x03,0x01,0x0A,0x00,0x00}}, /* Index Start Position */
      { 0x3F0D, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x07,0x02,0x02,0x01,0x01,0x02,0x00,0x00}}, /* Index Duration */
      { 0x3F05, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x04,0x06,0x02,0x01,0x00,0x00,0x00,0x00}}, /* Edit Unit Byte Count */
      { 0x3F06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x01,0x03,0x04,0x05,0x00,0x00,0x00,0x00}}, /* IndexSID */
      { 0x3F08, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x04,0x04,0x04,0x01,0x01,0x00,0x00,0x00}}, /* Slice Count */
      { 0x3F09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x04,0x04,0x01,0x06,0x00,0x00,0x00}}, /* Delta Entry Array */
      { 0x3F0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x04,0x04,0x02,0x05,0x00,0x00,0x00}}, /* Index Entry Array */
      // MPEG video Descriptor
      { 0x8000, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x01,0x06,0x02,0x01,0x0B,0x00,0x00}}, /* BitRate */
      { 0x8007, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x01,0x06,0x02,0x01,0x0A,0x00,0x00}}, /* ProfileAndLevel */
      // Wave Audio Essence Descriptor
      { 0x3D09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x03,0x03,0x05,0x00,0x00,0x00}}, /* Average Bytes Per Second */
      { 0x3D0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x03,0x02,0x01,0x00,0x00,0x00}}, /* Block Align */
  };
  
  static void mxf_write_uuid(AVIOContext *pb, enum MXFMetadataSetType type, int value)
  {
      avio_write(pb, uuid_base, 12);
      avio_wb16(pb, type);
      avio_wb16(pb, value);
  }
  
  static void mxf_write_umid(AVFormatContext *s, int type)
  {
      MXFContext *mxf = s->priv_data;
      avio_write(s->pb, umid_ul, 13);
      avio_wb24(s->pb, mxf->instance_number);
      avio_write(s->pb, mxf->umid, 15);
      avio_w8(s->pb, type);
  }
  
  static void mxf_write_refs_count(AVIOContext *pb, int ref_count)
  {
      avio_wb32(pb, ref_count);
      avio_wb32(pb, 16);
  }
  
  static int klv_ber_length(uint64_t len)
  {
      if (len < 128)
          return 1;
      else
          return (av_log2(len) >> 3) + 2;
  }
  
  static int klv_encode_ber_length(AVIOContext *pb, uint64_t len)
  {
      // Determine the best BER size
      int size;
      if (len < 128) {
          //short form
          avio_w8(pb, len);
          return 1;
      }
  
      size = (av_log2(len) >> 3) + 1;
  
      // long form
      avio_w8(pb, 0x80 + size);
      while(size) {
          size--;
          avio_w8(pb, len >> 8 * size & 0xff);
      }
      return 0;
  }
  
  static void klv_encode_ber4_length(AVIOContext *pb, int len)
  {
      avio_w8(pb, 0x80 + 3);
      avio_wb24(pb, len);
  }
  
  /*
   * Get essence container ul index
   */
  static int mxf_get_essence_container_ul_index(enum CodecID id)
  {
      int i;
      for (i = 0; mxf_essence_mappings[i].id; i++)
          if (mxf_essence_mappings[i].id == id)
              return mxf_essence_mappings[i].index;
      return -1;
  }
  
  static void mxf_write_primer_pack(AVFormatContext *s)
  {
      AVIOContext *pb = s->pb;
      int local_tag_number, i = 0;
  
      local_tag_number = FF_ARRAY_ELEMS(mxf_local_tag_batch);
  
      avio_write(pb, primer_pack_key, 16);
      klv_encode_ber_length(pb, local_tag_number * 18 + 8);
  
      avio_wb32(pb, local_tag_number); // local_tag num
      avio_wb32(pb, 18); // item size, always 18 according to the specs
  
      for (i = 0; i < local_tag_number; i++) {
          avio_wb16(pb, mxf_local_tag_batch[i].local_tag);
          avio_write(pb, mxf_local_tag_batch[i].uid, 16);
      }
  }
  
  static void mxf_write_local_tag(AVIOContext *pb, int size, int tag)
  {
      avio_wb16(pb, tag);
      avio_wb16(pb, size);
  }
  
  static void mxf_write_metadata_key(AVIOContext *pb, unsigned int value)
  {
      avio_write(pb, header_metadata_key, 13);
      avio_wb24(pb, value);
  }
  
  static void mxf_free(AVFormatContext *s)
  {
      int i;
  
      for (i = 0; i < s->nb_streams; i++) {
          AVStream *st = s->streams[i];
          av_freep(&st->priv_data);
      }
  }
  
  static const MXFCodecUL *mxf_get_data_definition_ul(int type)
  {
      const MXFCodecUL *uls = ff_mxf_data_definition_uls;
      while (uls->uid[0]) {
          if (type == uls->id)
              break;
          uls++;
      }
      return uls;
  }
  
  static void mxf_write_essence_container_refs(AVFormatContext *s)
  {
      MXFContext *c = s->priv_data;
      AVIOContext *pb = s->pb;
      int i;
  
      mxf_write_refs_count(pb, c->essence_container_count);
      av_log(s,AV_LOG_DEBUG, "essence container count:%d\n", c->essence_container_count);
      for (i = 0; i < c->essence_container_count; i++) {
          MXFStreamContext *sc = s->streams[i]->priv_data;
          avio_write(pb, mxf_essence_container_uls[sc->index].container_ul, 16);
      }
  }
  
  static void mxf_write_preface(AVFormatContext *s)
  {
      MXFContext *mxf = s->priv_data;
      AVIOContext *pb = s->pb;
  
      mxf_write_metadata_key(pb, 0x012f00);
      PRINT_KEY(s, "preface key", pb->buf_ptr - 16);
      klv_encode_ber_length(pb, 130 + 16 * mxf->essence_container_count);
  
      // write preface set uid
      mxf_write_local_tag(pb, 16, 0x3C0A);
      mxf_write_uuid(pb, Preface, 0);
      PRINT_KEY(s, "preface uid", pb->buf_ptr - 16);
  
      // last modified date
      mxf_write_local_tag(pb, 8, 0x3B02);
      avio_wb64(pb, mxf->timestamp);
  
      // write version
      mxf_write_local_tag(pb, 2, 0x3B05);
      avio_wb16(pb, 258); // v1.2
  
      // write identification_refs
      mxf_write_local_tag(pb, 16 + 8, 0x3B06);
      mxf_write_refs_count(pb, 1);
      mxf_write_uuid(pb, Identification, 0);
  
      // write content_storage_refs
      mxf_write_local_tag(pb, 16, 0x3B03);
      mxf_write_uuid(pb, ContentStorage, 0);
  
      // operational pattern
      mxf_write_local_tag(pb, 16, 0x3B09);
      avio_write(pb, op1a_ul, 16);
  
      // write essence_container_refs
      mxf_write_local_tag(pb, 8 + 16 * mxf->essence_container_count, 0x3B0A);
      mxf_write_essence_container_refs(s);
  
      // write dm_scheme_refs
      mxf_write_local_tag(pb, 8, 0x3B0B);
      avio_wb64(pb, 0);
  }
  
  /*
   * Write a local tag containing an ascii string as utf-16
   */
  static void mxf_write_local_tag_utf16(AVIOContext *pb, int tag, const char *value)
  {
      int i, size = strlen(value);
      mxf_write_local_tag(pb, size*2, tag);
      for (i = 0; i < size; i++)
          avio_wb16(pb, value[i]);
  }
  
  static void mxf_write_identification(AVFormatContext *s)
  {
      MXFContext *mxf = s->priv_data;
      AVIOContext *pb = s->pb;
      const char *company = "FFmpeg";
      const char *product = "OP1a Muxer";
      const char *version;
      int length;
  
      mxf_write_metadata_key(pb, 0x013000);
      PRINT_KEY(s, "identification key", pb->buf_ptr - 16);
  
      version = s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT ?
          "0.0.0" : AV_STRINGIFY(LIBAVFORMAT_VERSION);
      length = 84 + (strlen(company)+strlen(product)+strlen(version))*2; // utf-16
      klv_encode_ber_length(pb, length);
  
      // write uid
      mxf_write_local_tag(pb, 16, 0x3C0A);
      mxf_write_uuid(pb, Identification, 0);
      PRINT_KEY(s, "identification uid", pb->buf_ptr - 16);
  
      // write generation uid
      mxf_write_local_tag(pb, 16, 0x3C09);
      mxf_write_uuid(pb, Identification, 1);
  
      mxf_write_local_tag_utf16(pb, 0x3C01, company); // Company Name
      mxf_write_local_tag_utf16(pb, 0x3C02, product); // Product Name
      mxf_write_local_tag_utf16(pb, 0x3C04, version); // Version String
  
      // write product uid
      mxf_write_local_tag(pb, 16, 0x3C05);
      mxf_write_uuid(pb, Identification, 2);
  
      // modification date
      mxf_write_local_tag(pb, 8, 0x3C06);
      avio_wb64(pb, mxf->timestamp);
  }
  
  static void mxf_write_content_storage(AVFormatContext *s)
  {
      AVIOContext *pb = s->pb;
  
      mxf_write_metadata_key(pb, 0x011800);
      PRINT_KEY(s, "content storage key", pb->buf_ptr - 16);
      klv_encode_ber_length(pb, 92);
  
      // write uid
      mxf_write_local_tag(pb, 16, 0x3C0A);
      mxf_write_uuid(pb, ContentStorage, 0);
      PRINT_KEY(s, "content storage uid", pb->buf_ptr - 16);
  
      // write package reference
      mxf_write_local_tag(pb, 16 * 2 + 8, 0x1901);
      mxf_write_refs_count(pb, 2);
      mxf_write_uuid(pb, MaterialPackage, 0);
      mxf_write_uuid(pb, SourcePackage, 0);
  
      // write essence container data
      mxf_write_local_tag(pb, 8 + 16, 0x1902);
      mxf_write_refs_count(pb, 1);
      mxf_write_uuid(pb, EssenceContainerData, 0);
  }
  
  static void mxf_write_track(AVFormatContext *s, AVStream *st, enum MXFMetadataSetType type)
  {
      MXFContext *mxf = s->priv_data;
      AVIOContext *pb = s->pb;
      MXFStreamContext *sc = st->priv_data;
  
      mxf_write_metadata_key(pb, 0x013b00);
      PRINT_KEY(s, "track key", pb->buf_ptr - 16);
      klv_encode_ber_length(pb, 80);
  
      // write track uid
      mxf_write_local_tag(pb, 16, 0x3C0A);
      mxf_write_uuid(pb, type == MaterialPackage ? Track : Track + TypeBottom, st->index);
      PRINT_KEY(s, "track uid", pb->buf_ptr - 16);
  
      // write track id
      mxf_write_local_tag(pb, 4, 0x4801);
      avio_wb32(pb, st->index+2);
  
      // write track number
      mxf_write_local_tag(pb, 4, 0x4804);
      if (type == MaterialPackage)
          avio_wb32(pb, 0); // track number of material package is 0
      else
          avio_write(pb, sc->track_essence_element_key + 12, 4);
  
      mxf_write_local_tag(pb, 8, 0x4B01);
      avio_wb32(pb, mxf->time_base.den);
      avio_wb32(pb, mxf->time_base.num);
  
      // write origin
      mxf_write_local_tag(pb, 8, 0x4B02);
      avio_wb64(pb, 0);
  
      // write sequence refs
      mxf_write_local_tag(pb, 16, 0x4803);
      mxf_write_uuid(pb, type == MaterialPackage ? Sequence: Sequence + TypeBottom, st->index);
  }
  
  static const uint8_t smpte_12m_timecode_track_data_ul[] = { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x01,0x01,0x00,0x00,0x00 };
  
  static void mxf_write_common_fields(AVFormatContext *s, AVStream *st)
  {
      MXFContext *mxf = s->priv_data;
      AVIOContext *pb = s->pb;
  
      // find data define uls
      mxf_write_local_tag(pb, 16, 0x0201);
      if (st == mxf->timecode_track)
          avio_write(pb, smpte_12m_timecode_track_data_ul, 16);
      else {
          const MXFCodecUL *data_def_ul = mxf_get_data_definition_ul(st->codec->codec_type);
          avio_write(pb, data_def_ul->uid, 16);
      }
  
      // write duration
      mxf_write_local_tag(pb, 8, 0x0202);
      avio_wb64(pb, mxf->duration);
  }
  
  static void mxf_write_sequence(AVFormatContext *s, AVStream *st, enum MXFMetadataSetType type)
  {
      MXFContext *mxf = s->priv_data;
      AVIOContext *pb = s->pb;
      enum MXFMetadataSetType component;
  
      mxf_write_metadata_key(pb, 0x010f00);
      PRINT_KEY(s, "sequence key", pb->buf_ptr - 16);
      klv_encode_ber_length(pb, 80);
  
      mxf_write_local_tag(pb, 16, 0x3C0A);
      mxf_write_uuid(pb, type == MaterialPackage ? Sequence: Sequence + TypeBottom, st->index);
  
      PRINT_KEY(s, "sequence uid", pb->buf_ptr - 16);
      mxf_write_common_fields(s, st);
  
      // write structural component
      mxf_write_local_tag(pb, 16 + 8, 0x1001);
      mxf_write_refs_count(pb, 1);
      if (st == mxf->timecode_track)
          component = TimecodeComponent;
      else
          component = SourceClip;
      if (type == SourcePackage)
          component += TypeBottom;
      mxf_write_uuid(pb, component, st->index);
  }
  
  static void mxf_write_timecode_component(AVFormatContext *s, AVStream *st, enum MXFMetadataSetType type)
  {
      MXFContext *mxf = s->priv_data;
      AVIOContext *pb = s->pb;
  
      mxf_write_metadata_key(pb, 0x011400);
      klv_encode_ber_length(pb, 75);
  
      // UID
      mxf_write_local_tag(pb, 16, 0x3C0A);
      mxf_write_uuid(pb, type == MaterialPackage ? TimecodeComponent :
                     TimecodeComponent + TypeBottom, st->index);
  
      mxf_write_common_fields(s, st);
  
      // Start Time Code
      mxf_write_local_tag(pb, 8, 0x1501);
      avio_wb64(pb, mxf->timecode_start);
  
      // Rounded Time Code Base
      mxf_write_local_tag(pb, 2, 0x1502);
      avio_wb16(pb, mxf->timecode_base);
  
      // Drop Frame
      mxf_write_local_tag(pb, 1, 0x1503);
      avio_w8(pb, mxf->timecode_drop_frame);
  }
  
  static void mxf_write_structural_component(AVFormatContext *s, AVStream *st, enum MXFMetadataSetType type)
  {
      AVIOContext *pb = s->pb;
      int i;
  
      mxf_write_metadata_key(pb, 0x011100);
      PRINT_KEY(s, "sturctural component key", pb->buf_ptr - 16);
      klv_encode_ber_length(pb, 108);
  
      // write uid
      mxf_write_local_tag(pb, 16, 0x3C0A);
      mxf_write_uuid(pb, type == MaterialPackage ? SourceClip: SourceClip + TypeBottom, st->index);
  
      PRINT_KEY(s, "structural component uid", pb->buf_ptr - 16);
      mxf_write_common_fields(s, st);
  
      // write start_position
      mxf_write_local_tag(pb, 8, 0x1201);
      avio_wb64(pb, 0);
  
      // write source package uid, end of the reference
      mxf_write_local_tag(pb, 32, 0x1101);
      if (type == SourcePackage) {
          for (i = 0; i < 4; i++)
              avio_wb64(pb, 0);
      } else
          mxf_write_umid(s, 1);
  
      // write source track id
      mxf_write_local_tag(pb, 4, 0x1102);
      if (type == SourcePackage)
          avio_wb32(pb, 0);
      else
          avio_wb32(pb, st->index+2);
  }
  
  static void mxf_write_multi_descriptor(AVFormatContext *s)
  {
      MXFContext *mxf = s->priv_data;
      AVIOContext *pb = s->pb;
      const uint8_t *ul;
      int i;
  
      mxf_write_metadata_key(pb, 0x014400);
      PRINT_KEY(s, "multiple descriptor key", pb->buf_ptr - 16);
      klv_encode_ber_length(pb, 64 + 16 * s->nb_streams);
  
      mxf_write_local_tag(pb, 16, 0x3C0A);
      mxf_write_uuid(pb, MultipleDescriptor, 0);
      PRINT_KEY(s, "multi_desc uid", pb->buf_ptr - 16);
  
      // write sample rate
      mxf_write_local_tag(pb, 8, 0x3001);
      avio_wb32(pb, mxf->time_base.den);
      avio_wb32(pb, mxf->time_base.num);
  
      // write essence container ul
      mxf_write_local_tag(pb, 16, 0x3004);
      if (mxf->essence_container_count > 1)
          ul = multiple_desc_ul;
      else {
          MXFStreamContext *sc = s->streams[0]->priv_data;
          ul = mxf_essence_container_uls[sc->index].container_ul;
      }
      avio_write(pb, ul, 16);
  
      // write sub descriptor refs
      mxf_write_local_tag(pb, s->nb_streams * 16 + 8, 0x3F01);
      mxf_write_refs_count(pb, s->nb_streams);
      for (i = 0; i < s->nb_streams; i++)
          mxf_write_uuid(pb, SubDescriptor, i);
  }
  
  static void mxf_write_generic_desc(AVFormatContext *s, AVStream *st, const UID key, unsigned size)
  {
      MXFContext *mxf = s->priv_data;
      MXFStreamContext *sc = st->priv_data;
      AVIOContext *pb = s->pb;
  
      avio_write(pb, key, 16);
      klv_encode_ber4_length(pb, size+20+8+12+20);
  
      mxf_write_local_tag(pb, 16, 0x3C0A);
      mxf_write_uuid(pb, SubDescriptor, st->index);
  
      mxf_write_local_tag(pb, 4, 0x3006);
      avio_wb32(pb, st->index+2);
  
      mxf_write_local_tag(pb, 8, 0x3001);
      avio_wb32(pb, mxf->time_base.den);
      avio_wb32(pb, mxf->time_base.num);
  
      mxf_write_local_tag(pb, 16, 0x3004);
      avio_write(pb, mxf_essence_container_uls[sc->index].container_ul, 16);
  }
  
  static const UID mxf_mpegvideo_descriptor_key = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 };
  static const UID mxf_wav_descriptor_key       = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 };
  static const UID mxf_aes3_descriptor_key      = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 };
  static const UID mxf_cdci_descriptor_key      = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0D,0x01,0x01,0x01,0x01,0x01,0x28,0x00 };
  static const UID mxf_generic_sound_descriptor_key = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0D,0x01,0x01,0x01,0x01,0x01,0x42,0x00 };
  
  static void mxf_write_cdci_common(AVFormatContext *s, AVStream *st, const UID key, unsigned size)
  {
      MXFStreamContext *sc = st->priv_data;
      AVIOContext *pb = s->pb;
      int stored_height = (st->codec->height+15)/16*16;
      int display_height;
      int f1, f2;
  
      mxf_write_generic_desc(s, st, key, size+8+8+8+8+8+8+5+16+sc->interlaced*4+12+20);
  
      mxf_write_local_tag(pb, 4, 0x3203);
      avio_wb32(pb, st->codec->width);
  
      mxf_write_local_tag(pb, 4, 0x3202);
      avio_wb32(pb, stored_height>>sc->interlaced);
  
      mxf_write_local_tag(pb, 4, 0x3209);
      avio_wb32(pb, st->codec->width);
  
      if (st->codec->height == 608) // PAL + VBI
          display_height = 576;
      else if (st->codec->height == 512)  // NTSC + VBI
          display_height = 486;
      else
          display_height = st->codec->height;
  
      mxf_write_local_tag(pb, 4, 0x3208);
      avio_wb32(pb, display_height>>sc->interlaced);
  
      // component depth
      mxf_write_local_tag(pb, 4, 0x3301);
      avio_wb32(pb, 8);
  
      // horizontal subsampling
      mxf_write_local_tag(pb, 4, 0x3302);
      avio_wb32(pb, 2);
  
      // frame layout
      mxf_write_local_tag(pb, 1, 0x320C);
      avio_w8(pb, sc->interlaced);
  
      // video line map
      switch (st->codec->height) {
      case  576: f1 = 23; f2 = 336; break;
      case  608: f1 =  7; f2 = 320; break;
      case  480: f1 = 20; f2 = 283; break;
      case  512: f1 =  7; f2 = 270; break;
      case  720: f1 = 26; f2 =   0; break; // progressive
      case 1080: f1 = 21; f2 = 584; break;
      default:   f1 =  0; f2 =   0; break;
      }
  
      if (!sc->interlaced) {
          f2  = 0;
          f1 *= 2;
      }
  
      mxf_write_local_tag(pb, 12+sc->interlaced*4, 0x320D);
      avio_wb32(pb, sc->interlaced ? 2 : 1);
      avio_wb32(pb, 4);
      avio_wb32(pb, f1);
      if (sc->interlaced)
          avio_wb32(pb, f2);
  
      mxf_write_local_tag(pb, 8, 0x320E);
      avio_wb32(pb, sc->aspect_ratio.num);
      avio_wb32(pb, sc->aspect_ratio.den);
  
      mxf_write_local_tag(pb, 16, 0x3201);
      avio_write(pb, *sc->codec_ul, 16);
  }
  
  static void mxf_write_cdci_desc(AVFormatContext *s, AVStream *st)
  {
      mxf_write_cdci_common(s, st, mxf_cdci_descriptor_key, 0);
  }
  
  static void mxf_write_mpegvideo_desc(AVFormatContext *s, AVStream *st)
  {
      AVIOContext *pb = s->pb;
      int profile_and_level = (st->codec->profile<<4) | st->codec->level;
  
      mxf_write_cdci_common(s, st, mxf_mpegvideo_descriptor_key, 8+5);
  
      // bit rate
      mxf_write_local_tag(pb, 4, 0x8000);
      avio_wb32(pb, st->codec->bit_rate);
  
      // profile and level
      mxf_write_local_tag(pb, 1, 0x8007);
      if (!st->codec->profile)
          profile_and_level |= 0x80; // escape bit
      avio_w8(pb, profile_and_level);
  }
  
  static void mxf_write_generic_sound_common(AVFormatContext *s, AVStream *st, const UID key, unsigned size)
  {
      AVIOContext *pb = s->pb;
  
      mxf_write_generic_desc(s, st, key, size+5+12+8+8);
  
      // audio locked
      mxf_write_local_tag(pb, 1, 0x3D02);
      avio_w8(pb, 1);
  
      // write audio sampling rate
      mxf_write_local_tag(pb, 8, 0x3D03);
      avio_wb32(pb, st->codec->sample_rate);
      avio_wb32(pb, 1);
  
      mxf_write_local_tag(pb, 4, 0x3D07);
      avio_wb32(pb, st->codec->channels);
  
      mxf_write_local_tag(pb, 4, 0x3D01);
      avio_wb32(pb, av_get_bits_per_sample(st->codec->codec_id));
  }
  
  static void mxf_write_wav_common(AVFormatContext *s, AVStream *st, const UID key, unsigned size)
  {
      AVIOContext *pb = s->pb;
  
      mxf_write_generic_sound_common(s, st, key, size+6+8);
  
      mxf_write_local_tag(pb, 2, 0x3D0A);
      avio_wb16(pb, st->codec->block_align);
  
      // avg bytes per sec
      mxf_write_local_tag(pb, 4, 0x3D09);
      avio_wb32(pb, st->codec->block_align*st->codec->sample_rate);
  }
  
  static void mxf_write_wav_desc(AVFormatContext *s, AVStream *st)
  {
      mxf_write_wav_common(s, st, mxf_wav_descriptor_key, 0);
  }
  
  static void mxf_write_aes3_desc(AVFormatContext *s, AVStream *st)
  {
      mxf_write_wav_common(s, st, mxf_aes3_descriptor_key, 0);
  }
  
  static void mxf_write_generic_sound_desc(AVFormatContext *s, AVStream *st)
  {
      mxf_write_generic_sound_common(s, st, mxf_generic_sound_descriptor_key, 0);
  }
  
  static void mxf_write_package(AVFormatContext *s, enum MXFMetadataSetType type)
  {
      MXFContext *mxf = s->priv_data;
      AVIOContext *pb = s->pb;
      int i, track_count = s->nb_streams+1;
  
      if (type == MaterialPackage) {
          mxf_write_metadata_key(pb, 0x013600);
          PRINT_KEY(s, "Material Package key", pb->buf_ptr - 16);
          klv_encode_ber_length(pb, 92 + 16*track_count);
      } else {
          mxf_write_metadata_key(pb, 0x013700);
          PRINT_KEY(s, "Source Package key", pb->buf_ptr - 16);
          klv_encode_ber_length(pb, 112 + 16*track_count); // 20 bytes length for descriptor reference
      }
  
      // write uid
      mxf_write_local_tag(pb, 16, 0x3C0A);
      mxf_write_uuid(pb, type, 0);
      av_log(s,AV_LOG_DEBUG, "package type:%d\n", type);
      PRINT_KEY(s, "package uid", pb->buf_ptr - 16);
  
      // write package umid
      mxf_write_local_tag(pb, 32, 0x4401);
      mxf_write_umid(s, type == SourcePackage);
      PRINT_KEY(s, "package umid second part", pb->buf_ptr - 16);
  
      // package creation date
      mxf_write_local_tag(pb, 8, 0x4405);
      avio_wb64(pb, mxf->timestamp);
  
      // package modified date
      mxf_write_local_tag(pb, 8, 0x4404);
      avio_wb64(pb, mxf->timestamp);
  
      // write track refs
      mxf_write_local_tag(pb, track_count*16 + 8, 0x4403);
      mxf_write_refs_count(pb, track_count);
      mxf_write_uuid(pb, type == MaterialPackage ? Track :
                     Track + TypeBottom, -1); // timecode track
      for (i = 0; i < s->nb_streams; i++)
          mxf_write_uuid(pb, type == MaterialPackage ? Track : Track + TypeBottom, i);
  
      // write multiple descriptor reference
      if (type == SourcePackage) {
          mxf_write_local_tag(pb, 16, 0x4701);
          if (s->nb_streams > 1) {
              mxf_write_uuid(pb, MultipleDescriptor, 0);
              mxf_write_multi_descriptor(s);
          } else
              mxf_write_uuid(pb, SubDescriptor, 0);
      }
  
      // write timecode track
      mxf_write_track(s, mxf->timecode_track, type);
      mxf_write_sequence(s, mxf->timecode_track, type);
      mxf_write_timecode_component(s, mxf->timecode_track, type);
  
      for (i = 0; i < s->nb_streams; i++) {
          AVStream *st = s->streams[i];
          mxf_write_track(s, st, type);
          mxf_write_sequence(s, st, type);
          mxf_write_structural_component(s, st, type);
  
          if (type == SourcePackage) {
              MXFStreamContext *sc = st->priv_data;
              mxf_essence_container_uls[sc->index].write_desc(s, st);
          }
      }
  }
  
  static int mxf_write_essence_container_data(AVFormatContext *s)
  {
      AVIOContext *pb = s->pb;
  
      mxf_write_metadata_key(pb, 0x012300);
      klv_encode_ber_length(pb, 72);
  
      mxf_write_local_tag(pb, 16, 0x3C0A); // Instance UID
      mxf_write_uuid(pb, EssenceContainerData, 0);
  
      mxf_write_local_tag(pb, 32, 0x2701); // Linked Package UID
      mxf_write_umid(s, 1);
  
      mxf_write_local_tag(pb, 4, 0x3F07); // BodySID
      avio_wb32(pb, 1);
  
      mxf_write_local_tag(pb, 4, 0x3F06); // IndexSID
      avio_wb32(pb, 2);
  
      return 0;
  }
  
  static int mxf_write_header_metadata_sets(AVFormatContext *s)
  {
      mxf_write_preface(s);
      mxf_write_identification(s);
      mxf_write_content_storage(s);
      mxf_write_package(s, MaterialPackage);
      mxf_write_package(s, SourcePackage);
      mxf_write_essence_container_data(s);
      return 0;
  }
  
  static unsigned klv_fill_size(uint64_t size)
  {
      unsigned pad = KAG_SIZE - (size & (KAG_SIZE-1));
      if (pad < 20) // smallest fill item possible
          return pad + KAG_SIZE;
      else
          return pad & (KAG_SIZE-1);
  }
  
  static void mxf_write_index_table_segment(AVFormatContext *s)
  {
      MXFContext *mxf = s->priv_data;
      AVIOContext *pb = s->pb;
      int i, j, temporal_reordering = 0;
      int key_index = mxf->last_key_index;
  
      av_log(s, AV_LOG_DEBUG, "edit units count %d\n", mxf->edit_units_count);
  
      if (!mxf->edit_units_count && !mxf->edit_unit_byte_count)
          return;
  
      avio_write(pb, index_table_segment_key, 16);
  
      if (mxf->edit_unit_byte_count) {
          klv_encode_ber_length(pb, 80);
      } else {
          klv_encode_ber_length(pb, 85 + 12+(s->nb_streams+1)*6 +
                                12+mxf->edit_units_count*(11+mxf->slice_count*4));
      }
  
      // instance id
      mxf_write_local_tag(pb, 16, 0x3C0A);
      mxf_write_uuid(pb, IndexTableSegment, 0);
  
      // index edit rate
      mxf_write_local_tag(pb, 8, 0x3F0B);
      avio_wb32(pb, mxf->time_base.den);
      avio_wb32(pb, mxf->time_base.num);
  
      // index start position
      mxf_write_local_tag(pb, 8, 0x3F0C);
      avio_wb64(pb, mxf->last_indexed_edit_unit);
  
      // index duration
      mxf_write_local_tag(pb, 8, 0x3F0D);
      if (mxf->edit_unit_byte_count)
          avio_wb64(pb, 0); // index table covers whole container
      else
          avio_wb64(pb, mxf->edit_units_count);
  
      // edit unit byte count
      mxf_write_local_tag(pb, 4, 0x3F05);
      avio_wb32(pb, mxf->edit_unit_byte_count);
  
      // index sid
      mxf_write_local_tag(pb, 4, 0x3F06);
      avio_wb32(pb, 2);
  
      // body sid
      mxf_write_local_tag(pb, 4, 0x3F07);
      avio_wb32(pb, 1);
  
      if (!mxf->edit_unit_byte_count) {
          // real slice count - 1
          mxf_write_local_tag(pb, 1, 0x3F08);
          avio_w8(pb, mxf->slice_count);
  
          // delta entry array
          mxf_write_local_tag(pb, 8 + (s->nb_streams+1)*6, 0x3F09);
          avio_wb32(pb, s->nb_streams+1); // num of entries
          avio_wb32(pb, 6);               // size of one entry
          // write system item delta entry
          avio_w8(pb, 0);
          avio_w8(pb, 0); // slice entry
          avio_wb32(pb, 0); // element delta
          for (i = 0; i < s->nb_streams; i++) {
              AVStream *st = s->streams[i];
              MXFStreamContext *sc = st->priv_data;
              avio_w8(pb, sc->temporal_reordering);
              if (sc->temporal_reordering)
                  temporal_reordering = 1;
              if (i == 0) { // video track
                  avio_w8(pb, 0); // slice number
                  avio_wb32(pb, KAG_SIZE); // system item size including klv fill
              } else { // audio track
                  unsigned audio_frame_size = sc->aic.samples[0]*sc->aic.sample_size;
                  audio_frame_size += klv_fill_size(audio_frame_size);
                  avio_w8(pb, 1);
                  avio_wb32(pb, (i-1)*audio_frame_size); // element delta
              }
          }
  
          mxf_write_local_tag(pb, 8 + mxf->edit_units_count*(11+mxf->slice_count*4), 0x3F0A);
          avio_wb32(pb, mxf->edit_units_count);  // num of entries
          avio_wb32(pb, 11+mxf->slice_count*4);  // size of one entry
  
          for (i = 0; i < mxf->edit_units_count; i++) {
              int temporal_offset = 0;
  
              if (!(mxf->index_entries[i].flags & 0x33)) { // I frame
                  mxf->last_key_index = key_index;
                  key_index = i;
              }
  
              if (temporal_reordering) {
                  int pic_num_in_gop = i - key_index;
                  if (pic_num_in_gop != mxf->index_entries[i].temporal_ref) {
                      for (j = key_index; j < mxf->edit_units_count; j++) {
                          if (pic_num_in_gop == mxf->index_entries[j].temporal_ref)
                              break;
                      }
                      if (j == mxf->edit_units_count)
                          av_log(s, AV_LOG_WARNING, "missing frames\n");
                      temporal_offset = j - key_index - pic_num_in_gop;
                  }
              }
              avio_w8(pb, temporal_offset);
  
              if ((mxf->index_entries[i].flags & 0x30) == 0x30) { // back and forward prediction
                  avio_w8(pb, mxf->last_key_index - i);
              } else {
                  avio_w8(pb, key_index - i); // key frame offset
                  if ((mxf->index_entries[i].flags & 0x20) == 0x20) // only forward
                      mxf->last_key_index = key_index;
              }
  
              if (!(mxf->index_entries[i].flags & 0x33) && // I frame
                  mxf->index_entries[i].flags & 0x40 && !temporal_offset)
                  mxf->index_entries[i].flags |= 0x80; // random access
              avio_w8(pb, mxf->index_entries[i].flags);
              // stream offset
              avio_wb64(pb, mxf->index_entries[i].offset);
              if (s->nb_streams > 1)
                  avio_wb32(pb, mxf->index_entries[i].slice_offset);
          }
  
          mxf->last_key_index = key_index - mxf->edit_units_count;
          mxf->last_indexed_edit_unit += mxf->edit_units_count;
          mxf->edit_units_count = 0;
      }
  }
  
  static void mxf_write_klv_fill(AVFormatContext *s)
  {
      unsigned pad = klv_fill_size(avio_tell(s->pb));
      if (pad) {
          avio_write(s->pb, klv_fill_key, 16);
          pad -= 16 + 4;
          klv_encode_ber4_length(s->pb, pad);
          for (; pad; pad--)
              avio_w8(s->pb, 0);
          assert(!(avio_tell(s->pb) & (KAG_SIZE-1)));
      }
  }
  
  static void mxf_write_partition(AVFormatContext *s, int bodysid,
                                  int indexsid,
                                  const uint8_t *key, int write_metadata)
  {
      MXFContext *mxf = s->priv_data;
      AVIOContext *pb = s->pb;
      int64_t header_byte_count_offset;
      unsigned index_byte_count = 0;
      uint64_t partition_offset = avio_tell(pb);
  
      if (!mxf->edit_unit_byte_count && mxf->edit_units_count)
          index_byte_count = 85 + 12+(s->nb_streams+1)*6 +
              12+mxf->edit_units_count*(11+mxf->slice_count*4);
      else if (mxf->edit_unit_byte_count && indexsid)
          index_byte_count = 80;
  
      if (index_byte_count) {
          // add encoded ber length
          index_byte_count += 16 + klv_ber_length(index_byte_count);
          index_byte_count += klv_fill_size(index_byte_count);
      }
  
      if (!memcmp(key, body_partition_key, 16)) {
          mxf->body_partition_offset =
              av_realloc(mxf->body_partition_offset,
                         (mxf->body_partitions_count+1)*
                         sizeof(*mxf->body_partition_offset));
          mxf->body_partition_offset[mxf->body_partitions_count++] = partition_offset;
      }
  
      // write klv
      avio_write(pb, key, 16);
      klv_encode_ber_length(pb, 88 + 16 * mxf->essence_container_count);
  
      // write partition value
      avio_wb16(pb, 1); // majorVersion
      avio_wb16(pb, 2); // minorVersion
      avio_wb32(pb, KAG_SIZE); // KAGSize
  
      avio_wb64(pb, partition_offset); // ThisPartition
  
      if (!memcmp(key, body_partition_key, 16) && mxf->body_partitions_count > 1)
          avio_wb64(pb, mxf->body_partition_offset[mxf->body_partitions_count-2]); // PreviousPartition
      else if (!memcmp(key, footer_partition_key, 16) && mxf->body_partitions_count)
          avio_wb64(pb, mxf->body_partition_offset[mxf->body_partitions_count-1]); // PreviousPartition
      else
          avio_wb64(pb, 0);
  
      avio_wb64(pb, mxf->footer_partition_offset); // footerPartition
  
      // set offset
      header_byte_count_offset = avio_tell(pb);
      avio_wb64(pb, 0); // headerByteCount, update later
  
      // indexTable
      avio_wb64(pb, index_byte_count); // indexByteCount
      avio_wb32(pb, index_byte_count ? indexsid : 0); // indexSID
  
      // BodyOffset
      if (bodysid && mxf->edit_units_count && mxf->body_partitions_count) {
          avio_wb64(pb, mxf->body_offset);
      } else
          avio_wb64(pb, 0);
  
      avio_wb32(pb, bodysid); // bodySID
  
      // operational pattern
      avio_write(pb, op1a_ul, 16);
  
      // essence container
      mxf_write_essence_container_refs(s);
  
      if (write_metadata) {
          // mark the start of the headermetadata and calculate metadata size
          int64_t pos, start;
          unsigned header_byte_count;
  
          mxf_write_klv_fill(s);
          start = avio_tell(s->pb);
          mxf_write_primer_pack(s);
          mxf_write_header_metadata_sets(s);
          pos = avio_tell(s->pb);
          header_byte_count = pos - start + klv_fill_size(pos);
  
          // update header_byte_count
          avio_seek(pb, header_byte_count_offset, SEEK_SET);
          avio_wb64(pb, header_byte_count);
          avio_seek(pb, pos, SEEK_SET);
      }
  
      avio_flush(pb);
  }
  
  static const UID mxf_mpeg2_codec_uls[] = {
      { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x10,0x00 }, // MP-ML I-Frame
      { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, // MP-ML Long GOP
      { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, // 422P-ML I-Frame
      { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, // 422P-ML Long GOP
      { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x02,0x00 }, // MP-HL I-Frame
      { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, // MP-HL Long GOP
      { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x02,0x00 }, // 422P-HL I-Frame
      { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x03,0x00 }, // 422P-HL Long GOP
  };
  
  static const UID *mxf_get_mpeg2_codec_ul(AVCodecContext *avctx)
  {
      int long_gop = avctx->gop_size > 1 || avctx->has_b_frames;
  
      if (avctx->profile == 4) { // Main
          if (avctx->level == 8) // Main
              return &mxf_mpeg2_codec_uls[0+long_gop];
          else if (avctx->level == 4) // High
              return &mxf_mpeg2_codec_uls[4+long_gop];
      } else if (avctx->profile == 0) { // 422
          if (avctx->level == 5) // Main
              return &mxf_mpeg2_codec_uls[2+long_gop];
          else if (avctx->level == 2) // High
              return &mxf_mpeg2_codec_uls[6+long_gop];
      }
      return NULL;
  }
  
  static int mxf_parse_mpeg2_frame(AVFormatContext *s, AVStream *st,
                                   AVPacket *pkt, MXFIndexEntry *e)
  {
      MXFStreamContext *sc = st->priv_data;
      MXFContext *mxf = s->priv_data;
      uint32_t c = -1;
      int i;
  
      for(i = 0; i < pkt->size - 4; i++) {
          c = (c<<8) + pkt->data[i];
          if (c == 0x1b5) {
              if ((pkt->data[i+1] & 0xf0) == 0x10) { // seq ext
                  st->codec->profile = pkt->data[i+1] & 0x07;
                  st->codec->level   = pkt->data[i+2] >> 4;
              } else if (i + 5 < pkt->size && (pkt->data[i+1] & 0xf0) == 0x80) { // pict coding ext
                  sc->interlaced = !(pkt->data[i+5] & 0x80); // progressive frame
                  break;
              }
          } else if (c == 0x1b8) { // gop
              if (pkt->data[i+4]>>6 & 0x01) { // closed
                  sc->closed_gop = 1;
                  if (e->flags & 0x40) // sequence header present
                      e->flags |= 0x80; // random access
              }
              if (!mxf->header_written) {
                  unsigned hours   =  (pkt->data[i+1]>>2) & 0x1f;
                  unsigned minutes = ((pkt->data[i+1] & 0x03) << 4) | (pkt->data[i+2]>>4);
                  unsigned seconds = ((pkt->data[i+2] & 0x07) << 3) | (pkt->data[i+3]>>5);
                  unsigned frames  = ((pkt->data[i+3] & 0x1f) << 1) | (pkt->data[i+4]>>7);
                  mxf->timecode_drop_frame = !!(pkt->data[i+1] & 0x80);
                  mxf->timecode_start = (hours*3600 + minutes*60 + seconds) *
                      mxf->timecode_base + frames;
                  if (mxf->timecode_drop_frame) {
                      unsigned tminutes = 60 * hours + minutes;
                      mxf->timecode_start -= 2 * (tminutes - tminutes / 10);
                  }
                  av_log(s, AV_LOG_DEBUG, "frame %d %d:%d:%d%c%d\n", mxf->timecode_start,
                         hours, minutes, seconds, mxf->timecode_drop_frame ? ';':':', frames);
              }
          } else if (c == 0x1b3) { // seq
              e->flags |= 0x40;
              switch ((pkt->data[i+4]>>4) & 0xf) {
              case 2:  sc->aspect_ratio = (AVRational){  4,  3}; break;
              case 3:  sc->aspect_ratio = (AVRational){ 16,  9}; break;
              case 4:  sc->aspect_ratio = (AVRational){221,100}; break;
              default:
                  av_reduce(&sc->aspect_ratio.num, &sc->aspect_ratio.den,
                            st->codec->width, st->codec->height, 1024*1024);
              }
          } else if (c == 0x100) { // pic
              int pict_type = (pkt->data[i+2]>>3) & 0x07;
              e->temporal_ref = (pkt->data[i+1]<<2) | (pkt->data[i+2]>>6);
              if (pict_type == 2) { // P frame
                  e->flags |= 0x22;
                  sc->closed_gop = 0; // reset closed gop, don't matter anymore
              } else if (pict_type == 3) { // B frame
                  if (sc->closed_gop)
                      e->flags |= 0x13; // only backward prediction
                  else
                      e->flags |= 0x33;
                  sc->temporal_reordering = -1;
              } else if (!pict_type) {
                  av_log(s, AV_LOG_ERROR, "error parsing mpeg2 frame\n");
                  return 0;
              }
          }
      }
      if (s->oformat != &ff_mxf_d10_muxer)
          sc->codec_ul = mxf_get_mpeg2_codec_ul(st->codec);
      return !!sc->codec_ul;
  }
  
  static uint64_t mxf_parse_timestamp(time_t timestamp)
  {
      struct tm *time = gmtime(&timestamp);
      if (!time)
          return 0;
      return (uint64_t)(time->tm_year+1900) << 48 |
             (uint64_t)(time->tm_mon+1)     << 40 |
             (uint64_t) time->tm_mday       << 32 |
                        time->tm_hour       << 24 |
                        time->tm_min        << 16 |
                        time->tm_sec        << 8;
  }
  
  static void mxf_gen_umid(AVFormatContext *s)
  {
      MXFContext *mxf = s->priv_data;
      uint32_t seed = av_get_random_seed();
      uint64_t umid = seed + 0x5294713400000000LL;
  
      AV_WB64(mxf->umid  , umid);
      AV_WB64(mxf->umid+8, umid>>8);
  
      mxf->instance_number = seed;
  }
  
  static int mxf_write_header(AVFormatContext *s)
  {
      MXFContext *mxf = s->priv_data;
      int i;
      uint8_t present[FF_ARRAY_ELEMS(mxf_essence_container_uls)] = {0};
      const int *samples_per_frame = NULL;
  
      if (!s->nb_streams)
          return -1;
  
      for (i = 0; i < s->nb_streams; i++) {
          AVStream *st = s->streams[i];
          MXFStreamContext *sc = av_mallocz(sizeof(*sc));
          if (!sc)
              return AVERROR(ENOMEM);
          st->priv_data = sc;
  
          if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
              if (i != 0) {
                  av_log(s, AV_LOG_ERROR, "video stream must be first track\n");
                  return -1;
              }
              if (fabs(av_q2d(st->codec->time_base) - 1/25.0) < 0.0001) {
                  samples_per_frame = PAL_samples_per_frame;
                  mxf->time_base = (AVRational){ 1, 25 };
                  mxf->timecode_base = 25;
              } else if (fabs(av_q2d(st->codec->time_base) - 1001/30000.0) < 0.0001) {
                  samples_per_frame = NTSC_samples_per_frame;
                  mxf->time_base = (AVRational){ 1001, 30000 };
                  mxf->timecode_base = 30;
              } else {
                  av_log(s, AV_LOG_ERROR, "unsupported video frame rate\n");
                  return -1;
              }
              av_set_pts_info(st, 64, mxf->time_base.num, mxf->time_base.den);
              if (s->oformat == &ff_mxf_d10_muxer) {
                  if (st->codec->bit_rate == 50000000)
                      if (mxf->time_base.den == 25) sc->index = 3;
                      else                          sc->index = 5;
                  else if (st->codec->bit_rate == 40000000)
                      if (mxf->time_base.den == 25) sc->index = 7;
                      else                          sc->index = 9;
                  else if (st->codec->bit_rate == 30000000)
                      if (mxf->time_base.den == 25) sc->index = 11;
                      else                          sc->index = 13;
                  else {
                      av_log(s, AV_LOG_ERROR, "error MXF D-10 only support 30/40/50 mbit/s\n");
                      return -1;
                  }
  
                  mxf->edit_unit_byte_count = KAG_SIZE; // system element
                  mxf->edit_unit_byte_count += 16 + 4 + (uint64_t)st->codec->bit_rate *
                      mxf->time_base.num / (8*mxf->time_base.den);
                  mxf->edit_unit_byte_count += klv_fill_size(mxf->edit_unit_byte_count);
                  mxf->edit_unit_byte_count += 16 + 4 + 4 + samples_per_frame[0]*8*4;
                  mxf->edit_unit_byte_count += klv_fill_size(mxf->edit_unit_byte_count);
              }
          } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
              if (st->codec->sample_rate != 48000) {
                  av_log(s, AV_LOG_ERROR, "only 48khz is implemented\n");
                  return -1;
              }
              av_set_pts_info(st, 64, 1, st->codec->sample_rate);
              if (s->oformat == &ff_mxf_d10_muxer) {
                  if (st->index != 1) {
                      av_log(s, AV_LOG_ERROR, "MXF D-10 only support one audio track\n");
                      return -1;
                  }
                  if (st->codec->codec_id != CODEC_ID_PCM_S16LE &&
                      st->codec->codec_id != CODEC_ID_PCM_S24LE) {
                      av_log(s, AV_LOG_ERROR, "MXF D-10 only support 16 or 24 bits le audio\n");
                  }
                  sc->index = ((MXFStreamContext*)s->streams[0]->priv_data)->index + 1;
              } else
              mxf->slice_count = 1;
          }
  
          if (!sc->index) {
              sc->index = mxf_get_essence_container_ul_index(st->codec->codec_id);
              if (sc->index == -1) {
                  av_log(s, AV_LOG_ERROR, "track %d: could not find essence container ul, "
                         "codec not currently supported in container\n", i);
                  return -1;
              }
          }
  
          sc->codec_ul = &mxf_essence_container_uls[sc->index].codec_ul;
  
          memcpy(sc->track_essence_element_key, mxf_essence_container_uls[sc->index].element_ul, 15);
          sc->track_essence_element_key[15] = present[sc->index];
          PRINT_KEY(s, "track essence element key", sc->track_essence_element_key);
  
          if (!present[sc->index])
              mxf->essence_container_count++;
          present[sc->index]++;
      }
  
      if (s->oformat == &ff_mxf_d10_muxer) {
          mxf->essence_container_count = 1;
      }
  
      if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
          mxf_gen_umid(s);
  
      for (i = 0; i < s->nb_streams; i++) {
          MXFStreamContext *sc = s->streams[i]->priv_data;
          // update element count
          sc->track_essence_element_key[13] = present[sc->index];
          sc->order = AV_RB32(sc->track_essence_element_key+12);
      }
  
      if (s->timestamp)
          mxf->timestamp = mxf_parse_timestamp(s->timestamp);
      mxf->duration = -1;
  
      mxf->timecode_track = av_mallocz(sizeof(*mxf->timecode_track));
      if (!mxf->timecode_track)
          return AVERROR(ENOMEM);
      mxf->timecode_track->priv_data = av_mallocz(sizeof(MXFStreamContext));
      if (!mxf->timecode_track->priv_data)
          return AVERROR(ENOMEM);
      mxf->timecode_track->index = -1;
  
      if (!samples_per_frame)
          samples_per_frame = PAL_samples_per_frame;
  
      if (ff_audio_interleave_init(s, samples_per_frame, mxf->time_base) < 0)
          return -1;
  
      return 0;
  }
  
  static const uint8_t system_metadata_pack_key[]        = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x03,0x01,0x04,0x01,0x01,0x00 };
  static const uint8_t system_metadata_package_set_key[] = { 0x06,0x0E,0x2B,0x34,0x02,0x43,0x01,0x01,0x0D,0x01,0x03,0x01,0x04,0x01,0x02,0x01 };
  
  static uint32_t ff_framenum_to_12m_time_code(unsigned frame, int drop, int fps)
  {
      return (0                                    << 31) | // color frame flag
             (drop                                 << 30) | // drop  frame flag
             ( ((frame % fps) / 10)                << 28) | // tens  of frames
             ( ((frame % fps) % 10)                << 24) | // units of frames
             (0                                    << 23) | // field phase (NTSC), b0 (PAL)
             ((((frame / fps) % 60) / 10)          << 20) | // tens  of seconds
             ((((frame / fps) % 60) % 10)          << 16) | // units of seconds
             (0                                    << 15) | // b0 (NTSC), b2 (PAL)
             ((((frame / (fps * 60)) % 60) / 10)   << 12) | // tens  of minutes
             ((((frame / (fps * 60)) % 60) % 10)   <<  8) | // units of minutes
             (0                                    <<  7) | // b1
             (0                                    <<  6) | // b2 (NSC), field phase (PAL)
             ((((frame / (fps * 3600) % 24)) / 10) <<  4) | // tens  of hours
             (  (frame / (fps * 3600) % 24)) % 10;          // units of hours
  }
  
  static void mxf_write_system_item(AVFormatContext *s)
  {
      MXFContext *mxf = s->priv_data;
      AVIOContext *pb = s->pb;
      unsigned frame;
      uint32_t time_code;
  
      frame = mxf->timecode_start + mxf->last_indexed_edit_unit + mxf->edit_units_count;
  
      // write system metadata pack
      avio_write(pb, system_metadata_pack_key, 16);
      klv_encode_ber4_length(pb, 57);
      avio_w8(pb, 0x5c); // UL, user date/time stamp, picture and sound item present
      avio_w8(pb, 0x04); // content package rate
      avio_w8(pb, 0x00); // content package type
      avio_wb16(pb, 0x00); // channel handle
      avio_wb16(pb, frame); // continuity count
      if (mxf->essence_container_count > 1)
          avio_write(pb, multiple_desc_ul, 16);
      else {
          MXFStreamContext *sc = s->streams[0]->priv_data;
          avio_write(pb, mxf_essence_container_uls[sc->index].container_ul, 16);
      }
      avio_w8(pb, 0);
      avio_wb64(pb, 0);
      avio_wb64(pb, 0); // creation date/time stamp
  
      avio_w8(pb, 0x81); // SMPTE 12M time code
      time_code = ff_framenum_to_12m_time_code(frame, mxf->timecode_drop_frame, mxf->timecode_base);
      avio_wb32(pb, time_code);
      avio_wb32(pb, 0); // binary group data
      avio_wb64(pb, 0);
  
      // write system metadata package set
      avio_write(pb, system_metadata_package_set_key, 16);
      klv_encode_ber4_length(pb, 35);
      avio_w8(pb, 0x83); // UMID
      avio_wb16(pb, 0x20);
      mxf_write_umid(s, 1);
  }
  
  static void mxf_write_d10_video_packet(AVFormatContext *s, AVStream *st, AVPacket *pkt)
  {
      MXFContext *mxf = s->priv_data;
      AVIOContext *pb = s->pb;
      int packet_size = (uint64_t)st->codec->bit_rate*mxf->time_base.num /
          (8*mxf->time_base.den); // frame size
      int pad;
  
      packet_size += 16 + 4;
      packet_size += klv_fill_size(packet_size);
  
      klv_encode_ber4_length(pb, pkt->size);
      avio_write(pb, pkt->data, pkt->size);
  
      // ensure CBR muxing by padding to correct video frame size
      pad = packet_size - pkt->size - 16 - 4;
      if (pad > 20) {
          avio_write(s->pb, klv_fill_key, 16);
          pad -= 16 + 4;
          klv_encode_ber4_length(s->pb, pad);
          for (; pad; pad--)
              avio_w8(s->pb, 0);
          assert(!(avio_tell(s->pb) & (KAG_SIZE-1)));
      } else {
          av_log(s, AV_LOG_WARNING, "cannot fill d-10 video packet\n");
          for (; pad > 0; pad--)
              avio_w8(s->pb, 0);
      }
  }
  
  static void mxf_write_d10_audio_packet(AVFormatContext *s, AVStream *st, AVPacket *pkt)
  {
      MXFContext *mxf = s->priv_data;
      AVIOContext *pb = s->pb;
      int frame_size = pkt->size / st->codec->block_align;
      uint8_t *samples = pkt->data;
      uint8_t *end = pkt->data + pkt->size;
      int i;
  
      klv_encode_ber4_length(pb, 4 + frame_size*4*8);
  
      avio_w8(pb, (frame_size == 1920 ? 0 : (mxf->edit_units_count-1) % 5 + 1));
      avio_wl16(pb, frame_size);
      avio_w8(pb, (1<<st->codec->channels)-1);
  
      while (samples < end) {
          for (i = 0; i < st->codec->channels; i++) {
              uint32_t sample;
              if (st->codec->codec_id == CODEC_ID_PCM_S24LE) {
                  sample = AV_RL24(samples)<< 4;
                  samples += 3;
              } else {
                  sample = AV_RL16(samples)<<12;
                  samples += 2;
              }
              avio_wl32(pb, sample | i);
          }
          for (; i < 8; i++)
              avio_wl32(pb, i);
      }
  }
  
  static int mxf_write_packet(AVFormatContext *s, AVPacket *pkt)
  {
      MXFContext *mxf = s->priv_data;
      AVIOContext *pb = s->pb;
      AVStream *st = s->streams[pkt->stream_index];
      MXFStreamContext *sc = st->priv_data;
      MXFIndexEntry ie = {0};
  
      if (!mxf->edit_unit_byte_count && !(mxf->edit_units_count % EDIT_UNITS_PER_BODY)) {
          mxf->index_entries = av_realloc(mxf->index_entries,
              (mxf->edit_units_count + EDIT_UNITS_PER_BODY)*sizeof(*mxf->index_entries));
          if (!mxf->index_entries) {
              av_log(s, AV_LOG_ERROR, "could not allocate index entries\n");
              return -1;
          }
      }
  
      if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO) {
          if (!mxf_parse_mpeg2_frame(s, st, pkt, &ie)) {
              av_log(s, AV_LOG_ERROR, "could not get mpeg2 profile and level\n");
              return -1;
          }
      }
  
      if (!mxf->header_written) {
          if (mxf->edit_unit_byte_count) {
              mxf_write_partition(s, 1, 2, header_open_partition_key, 1);
              mxf_write_klv_fill(s);
              mxf_write_index_table_segment(s);
          } else {
              mxf_write_partition(s, 0, 0, header_open_partition_key, 1);
          }
          mxf->header_written = 1;
      }
  
      if (st->index == 0) {
          if (!mxf->edit_unit_byte_count &&
              (!mxf->edit_units_count || mxf->edit_units_count > EDIT_UNITS_PER_BODY) &&
              !(ie.flags & 0x33)) { // I frame, Gop start
              mxf_write_klv_fill(s);
              mxf_write_partition(s, 1, 2, body_partition_key, 0);
  
              mxf_write_klv_fill(s);
              mxf_write_index_table_segment(s);
          }
  
          mxf_write_klv_fill(s);
          mxf_write_system_item(s);
  
          if (!mxf->edit_unit_byte_count) {
              mxf->index_entries[mxf->edit_units_count].offset = mxf->body_offset;
              mxf->index_entries[mxf->edit_units_count].flags = ie.flags;
              mxf->index_entries[mxf->edit_units_count].temporal_ref = ie.temporal_ref;
              mxf->body_offset += KAG_SIZE; // size of system element
          }
          mxf->edit_units_count++;
      } else if (!mxf->edit_unit_byte_count && st->index == 1) {
          mxf->index_entries[mxf->edit_units_count-1].slice_offset =
              mxf->body_offset - mxf->index_entries[mxf->edit_units_count-1].offset;
      }
  
      mxf_write_klv_fill(s);
      avio_write(pb, sc->track_essence_element_key, 16); // write key
      if (s->oformat == &ff_mxf_d10_muxer) {
          if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
              mxf_write_d10_video_packet(s, st, pkt);
          else
              mxf_write_d10_audio_packet(s, st, pkt);
      } else {
          klv_encode_ber4_length(pb, pkt->size); // write length
          avio_write(pb, pkt->data, pkt->size);
          mxf->body_offset += 16+4+pkt->size + klv_fill_size(16+4+pkt->size);
      }
  
      avio_flush(pb);
  
      return 0;
  }
  
  static void mxf_write_random_index_pack(AVFormatContext *s)
  {
      MXFContext *mxf = s->priv_data;
      AVIOContext *pb = s->pb;
      uint64_t pos = avio_tell(pb);
      int i;
  
      avio_write(pb, random_index_pack_key, 16);
      klv_encode_ber_length(pb, 28 + 12*mxf->body_partitions_count);
  
      if (mxf->edit_unit_byte_count)
          avio_wb32(pb, 1); // BodySID of header partition
      else
          avio_wb32(pb, 0);
      avio_wb64(pb, 0); // offset of header partition
  
      for (i = 0; i < mxf->body_partitions_count; i++) {
          avio_wb32(pb, 1); // BodySID
          avio_wb64(pb, mxf->body_partition_offset[i]);
      }
  
      avio_wb32(pb, 0); // BodySID of footer partition
      avio_wb64(pb, mxf->footer_partition_offset);
  
      avio_wb32(pb, avio_tell(pb) - pos + 4);
  }
  
  static int mxf_write_footer(AVFormatContext *s)
  {
      MXFContext *mxf = s->priv_data;
      AVIOContext *pb = s->pb;
  
      mxf->duration = mxf->last_indexed_edit_unit + mxf->edit_units_count;
  
      mxf_write_klv_fill(s);
      mxf->footer_partition_offset = avio_tell(pb);
      if (mxf->edit_unit_byte_count) { // no need to repeat index
          mxf_write_partition(s, 0, 0, footer_partition_key, 0);
      } else {
          mxf_write_partition(s, 0, 2, footer_partition_key, 0);
  
          mxf_write_klv_fill(s);
          mxf_write_index_table_segment(s);
      }
  
      mxf_write_klv_fill(s);
      mxf_write_random_index_pack(s);
  
      if (s->pb->seekable) {
          avio_seek(pb, 0, SEEK_SET);
          if (mxf->edit_unit_byte_count) {
              mxf_write_partition(s, 1, 2, header_closed_partition_key, 1);
              mxf_write_klv_fill(s);
              mxf_write_index_table_segment(s);
          } else {
              mxf_write_partition(s, 0, 0, header_closed_partition_key, 1);
          }
      }
  
      avio_flush(pb);
  
      ff_audio_interleave_close(s);
  
      av_freep(&mxf->index_entries);
      av_freep(&mxf->body_partition_offset);
      av_freep(&mxf->timecode_track->priv_data);
      av_freep(&mxf->timecode_track);
  
      mxf_free(s);
  
      return 0;
  }
  
  static int mxf_interleave_get_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
  {
      int i, stream_count = 0;
  
      for (i = 0; i < s->nb_streams; i++)
          stream_count += !!s->streams[i]->last_in_packet_buffer;
  
      if (stream_count && (s->nb_streams == stream_count || flush)) {
          AVPacketList *pktl = s->packet_buffer;
          if (s->nb_streams != stream_count) {
              AVPacketList *last = NULL;
              // find last packet in edit unit
              while (pktl) {
                  if (!stream_count || pktl->pkt.stream_index == 0)
                      break;
                  last = pktl;
                  pktl = pktl->next;
                  stream_count--;
              }
              // purge packet queue
              while (pktl) {
                  AVPacketList *next = pktl->next;
  
                  if(s->streams[pktl->pkt.stream_index]->last_in_packet_buffer == pktl)
                      s->streams[pktl->pkt.stream_index]->last_in_packet_buffer= NULL;
                  av_free_packet(&pktl->pkt);
                  av_freep(&pktl);
                  pktl = next;
              }
              if (last)
                  last->next = NULL;
              else {
                  s->packet_buffer = NULL;
                  s->packet_buffer_end= NULL;
                  goto out;
              }
              pktl = s->packet_buffer;
          }
  
          *out = pktl->pkt;
          //av_log(s, AV_LOG_DEBUG, "out st:%d dts:%lld\n", (*out).stream_index, (*out).dts);
          s->packet_buffer = pktl->next;
          if(s->streams[pktl->pkt.stream_index]->last_in_packet_buffer == pktl)
              s->streams[pktl->pkt.stream_index]->last_in_packet_buffer= NULL;
          if(!s->packet_buffer)
              s->packet_buffer_end= NULL;
          av_freep(&pktl);
          return 1;
      } else {
      out:
          av_init_packet(out);
          return 0;
      }
  }
  
  static int mxf_compare_timestamps(AVFormatContext *s, AVPacket *next, AVPacket *pkt)
  {
      MXFStreamContext *sc  = s->streams[pkt ->stream_index]->priv_data;
      MXFStreamContext *sc2 = s->streams[next->stream_index]->priv_data;
  
      return next->dts > pkt->dts ||
          (next->dts == pkt->dts && sc->order < sc2->order);
  }
  
  static int mxf_interleave(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
  {
      return ff_audio_rechunk_interleave(s, out, pkt, flush,
                                 mxf_interleave_get_packet, mxf_compare_timestamps);
  }
  
  AVOutputFormat ff_mxf_muxer = {
      "mxf",
      NULL_IF_CONFIG_SMALL("Material eXchange Format"),
      "application/mxf",
      "mxf",
      sizeof(MXFContext),
      CODEC_ID_PCM_S16LE,
      CODEC_ID_MPEG2VIDEO,
      mxf_write_header,
      mxf_write_packet,
      mxf_write_footer,
      AVFMT_NOTIMESTAMPS,
      NULL,
      mxf_interleave,
  };
  
  AVOutputFormat ff_mxf_d10_muxer = {
      "mxf_d10",
      NULL_IF_CONFIG_SMALL("Material eXchange Format, D-10 Mapping"),
      "application/mxf",
      NULL,
      sizeof(MXFContext),
      CODEC_ID_PCM_S16LE,
      CODEC_ID_MPEG2VIDEO,
      mxf_write_header,
      mxf_write_packet,
      mxf_write_footer,
      AVFMT_NOTIMESTAMPS,
      NULL,
      mxf_interleave,
  };
  