/*
  * 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

  *

  * signal_standard, color_siting, store_user_comments and klv_fill_key version
  * fixes sponsored by NOA GmbH

  */
 
 /*
  * 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 422M Mapping JPEG 2000 Codestreams into the MXF Generic Container

  * SMPTE RP210: SMPTE Metadata Dictionary
  * SMPTE RP224: Registry of SMPTE Universal Labels
  */
 

 #include <inttypes.h>

 #include <math.h>

 #include <time.h>

 #include "libavutil/opt.h"

 #include "libavutil/random_seed.h"

 #include "libavutil/timecode.h"

 #include "libavutil/avassert.h"

 #include "libavutil/pixdesc.h"

 #include "libavutil/time_internal.h"

 #include "libavcodec/bytestream.h"

 #include "libavcodec/dnxhddata.h"

 #include "libavcodec/h264.h"
 #include "libavcodec/internal.h"

 #include "audiointerleave.h"

 #include "avformat.h"

 #include "avio_internal.h"

 #include "internal.h"

 #include "mxf.h"

 #include "config.h"

 extern AVOutputFormat ff_mxf_d10_muxer;

 extern AVOutputFormat ff_mxf_opatom_muxer;

 #define EDIT_UNITS_PER_BODY 250

 #define KAG_SIZE 512

 typedef struct MXFLocalTagPair {

     int local_tag;
     UID uid;
 } MXFLocalTagPair;
 

 typedef struct MXFIndexEntry {

     uint8_t flags;
     uint64_t offset;

     unsigned slice_offset; ///< offset of audio slice

     uint16_t temporal_ref;

 } MXFIndexEntry;
 

 typedef struct MXFStreamContext {

     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;          ///< whether picture is interlaced

     int field_dominance;     ///< tff=1, bff=2

     int component_depth;

     int color_siting;

     int signal_standard;

     int h_chroma_sub_sample;

     int temporal_reordering;

     AVRational aspect_ratio; ///< display aspect ratio

     int closed_gop;          ///< gop is closed, used in mpeg-2 frame parsing

     int video_bit_rate;

 } MXFStreamContext;
 

 typedef struct MXFContainerEssenceEntry {

     UID container_ul;
     UID element_ul;

     UID codec_ul;

     void (*write_desc)(AVFormatContext *, AVStream *);

 } MXFContainerEssenceEntry;

 static const struct {

     enum AVCodecID id;

     int index;
 } mxf_essence_mappings[] = {

     { AV_CODEC_ID_MPEG2VIDEO, 0 },
     { AV_CODEC_ID_PCM_S24LE,  1 },
     { AV_CODEC_ID_PCM_S16LE,  1 },

     { AV_CODEC_ID_DVVIDEO,   15 },
     { AV_CODEC_ID_DNXHD,     24 },

     { AV_CODEC_ID_JPEG2000,  34 },

     { AV_CODEC_ID_H264,      35 },

     { AV_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 },

     // DV Unknown

     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x7F,0x01 },
       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x18,0x01,0x01,0x00 },
       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x00,0x00,0x00 },
       mxf_write_cdci_desc },
     // DV25 525/60
     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x40,0x01 },
       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x18,0x01,0x01,0x00 },
       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x01,0x00 },
       mxf_write_cdci_desc },
     // DV25 625/50
     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 },
       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x18,0x01,0x01,0x00 },
       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x02,0x00 },
       mxf_write_cdci_desc },
     // DV50 525/60
     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x50,0x01 },
       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x18,0x01,0x01,0x00 },
       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x03,0x00 },
       mxf_write_cdci_desc },
     // DV50 625/50
     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x51,0x01 },
       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x18,0x01,0x01,0x00 },
       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x04,0x00 },
       mxf_write_cdci_desc },
     // DV100 1080/60
     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x60,0x01 },
       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x18,0x01,0x01,0x00 },
       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x05,0x00 },
       mxf_write_cdci_desc },
     // DV100 1080/50
     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x61,0x01 },
       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x18,0x01,0x01,0x00 },
       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x06,0x00 },
       mxf_write_cdci_desc },
     // DV100 720/60
     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x62,0x01 },
       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x18,0x01,0x01,0x00 },
       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x07,0x00 },
       mxf_write_cdci_desc },
     // DV100 720/50
     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x63,0x01 },
       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x18,0x01,0x01,0x00 },
       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x08,0x00 },
       mxf_write_cdci_desc },

     // DNxHD 1080p 10bit high
     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x11,0x01,0x00 },
       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x15,0x01,0x05,0x00 },

       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x71,0x01,0x00,0x00 },

       mxf_write_cdci_desc },
     // DNxHD 1080p 8bit medium
     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x11,0x01,0x00 },
       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x15,0x01,0x05,0x00 },

       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x71,0x03,0x00,0x00 },

       mxf_write_cdci_desc },
     // DNxHD 1080p 8bit high
     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x11,0x01,0x00 },
       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x15,0x01,0x05,0x00 },

       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x71,0x04,0x00,0x00 },

       mxf_write_cdci_desc },
     // DNxHD 1080i 10bit high
     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x11,0x01,0x00 },
       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x15,0x01,0x05,0x00 },

       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x71,0x07,0x00,0x00 },

       mxf_write_cdci_desc },
     // DNxHD 1080i 8bit medium
     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x11,0x01,0x00 },
       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x15,0x01,0x05,0x00 },

       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x71,0x08,0x00,0x00 },

       mxf_write_cdci_desc },
     // DNxHD 1080i 8bit high
     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x11,0x01,0x00 },
       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x15,0x01,0x05,0x00 },

       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x71,0x09,0x00,0x00 },

       mxf_write_cdci_desc },
     // DNxHD 720p 10bit
     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0d,0x01,0x03,0x01,0x02,0x11,0x01,0x00 },
       { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01,0x15,0x01,0x05,0x00 },

       { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x71,0x10,0x00,0x00 },

       mxf_write_cdci_desc },
     // DNxHD 720p 8bit high
     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0d,0x01,0x03,0x01,0x02,0x11,0x01,0x00 },
       { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01,0x15,0x01,0x05,0x00 },

       { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x71,0x11,0x00,0x00 },

       mxf_write_cdci_desc },
     // DNxHD 720p 8bit medium
     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0d,0x01,0x03,0x01,0x02,0x11,0x01,0x00 },
       { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01,0x15,0x01,0x05,0x00 },

       { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x71,0x12,0x00,0x00 },

       mxf_write_cdci_desc },
     // DNxHD 720p 8bit low
     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0d,0x01,0x03,0x01,0x02,0x11,0x01,0x00 },
       { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01,0x15,0x01,0x05,0x00 },

       { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x71,0x13,0x00,0x00 },

       mxf_write_cdci_desc },

     // JPEG2000
     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x0c,0x01,0x00 },
       { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01,0x15,0x01,0x08,0x00 },
       { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 },
       mxf_write_cdci_desc },

     // H.264
     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x0D,0x01,0x03,0x01,0x02,0x10,0x60,0x01 },
       { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x15,0x01,0x05,0x00 },
       { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x00,0x00,0x00 },
       mxf_write_mpegvideo_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 {

     AVClass *av_class;

     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;

     AVTimecode tc;       ///< timecode context

     AVStream *timecode_track;
     int timecode_base;       ///< rounded time code base (25 or 30)

     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

     int channel_count;

     int signal_standard;

     uint32_t tagged_value_count;

     AVRational audio_edit_rate;

     int store_user_comments;

 } 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 opatom_ul[]                   = { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x02,0x01,0x10,0x03,0x00,0x00 };

 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,0x34,0x01,0x01,0x01,0x02,0x03,0x01,0x02,0x10,0x01,0x00,0x00,0x00 };

 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 */

     { 0x4402, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x01,0x03,0x03,0x02,0x01,0x00,0x00,0x00}}, /* Package Name */

     { 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 */

     { 0x3002, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x06,0x01,0x02,0x00,0x00,0x00,0x00}}, /* ContainerDuration */

     { 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 */

     { 0x320B, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x01,0x0E,0x00,0x00,0x00}}, /* Presentation Y offset */

     { 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 */

     { 0x3212, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x01,0x03,0x01,0x06,0x00,0x00,0x00}}, /* Field Dominance (Opt) */

     { 0x3215, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x05,0x01,0x13,0x00,0x00,0x00,0x00}}, /* Signal Standard */

     // 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 */

     { 0x3303, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x01,0x06,0x00,0x00,0x00}}, /* Color Siting */

     // 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 const MXFLocalTagPair mxf_user_comments_local_tag[] = {
     { 0x4406, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x03,0x02,0x01,0x02,0x0C,0x00,0x00,0x00}}, /* User Comments */
     { 0x5001, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x03,0x02,0x01,0x02,0x09,0x01,0x00,0x00}}, /* Name */
     { 0x5003, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x03,0x02,0x01,0x02,0x0A,0x01,0x00,0x00}}, /* Value */
 };
 

 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);

 }
 

 static void klv_encode_ber9_length(AVIOContext *pb, uint64_t len)
 {
     avio_w8(pb, 0x80 + 8);
     avio_wb64(pb, len);
 }
 

 /*

  * Get essence container ul index

  */

 static int mxf_get_essence_container_ul_index(enum AVCodecID 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)

 {

     MXFContext *mxf = s->priv_data;

     AVIOContext *pb = s->pb;

     int local_tag_number, i = 0;
 

     local_tag_number = FF_ARRAY_ELEMS(mxf_local_tag_batch);

     local_tag_number += mxf->store_user_comments * FF_ARRAY_ELEMS(mxf_user_comments_local_tag);

     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 < FF_ARRAY_ELEMS(mxf_local_tag_batch); i++) {

         avio_wb16(pb, mxf_local_tag_batch[i].local_tag);
         avio_write(pb, mxf_local_tag_batch[i].uid, 16);

     }

     if (mxf->store_user_comments)
         for (i = 0; i < FF_ARRAY_ELEMS(mxf_user_comments_local_tag); i++) {
             avio_wb16(pb, mxf_user_comments_local_tag[i].local_tag);
             avio_write(pb, mxf_user_comments_local_tag[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;
 }
 

 //one EC -> one descriptor. N ECs -> MultipleDescriptor + N descriptors
 #define DESCRIPTOR_COUNT(essence_container_count) \
     (essence_container_count > 1 ? essence_container_count + 1 : essence_container_count)
 

 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, DESCRIPTOR_COUNT(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);

     }

 
     if (c->essence_container_count > 1)
         avio_write(pb, multiple_desc_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 + 16LL * DESCRIPTOR_COUNT(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);

     if (s->oformat == &ff_mxf_opatom_muxer)
         avio_write(pb, opatom_ul, 16);
     else
         avio_write(pb, op1a_ul, 16);

 
     // write essence_container_refs

     mxf_write_local_tag(pb, 8 + 16LL * DESCRIPTOR_COUNT(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);

 }
 

 /*

  * Returns the length of the UTF-16 string, in 16-bit characters, that would result
  * from decoding the utf-8 string.
  */
 static uint64_t mxf_utf16len(const char *utf8_str)
 {
     const uint8_t *q = utf8_str;
     uint64_t size = 0;
     while (*q) {
         uint32_t ch;
         GET_UTF8(ch, *q++, goto invalid;)
         if (ch < 0x10000)
             size++;
         else
             size += 2;
         continue;
 invalid:
         av_log(NULL, AV_LOG_ERROR, "Invaid UTF8 sequence in mxf_utf16len\n\n");
     }
     size += 1;
     return size;
 }
 
 /*
  * Returns the calculated length a local tag containing an utf-8 string as utf-16
  */
 static int mxf_utf16_local_tag_length(const char *utf8_str)
 {
     uint64_t size;
 
     if (!utf8_str)
         return 0;
 
     size = mxf_utf16len(utf8_str);
     if (size >= UINT16_MAX/2) {
         av_log(NULL, AV_LOG_ERROR, "utf16 local tag size %"PRIx64" invalid (too large), ignoring\n", size);
         return 0;
     }
 
     return 4 + size * 2;
 }
 
 /*
  * Write a local tag containing an utf-8 string as utf-16

  */

 static void mxf_write_local_tag_utf16(AVIOContext *pb, int tag, const char *value)

 {

     uint64_t size = mxf_utf16len(value);
 
     if (size >= UINT16_MAX/2) {
         av_log(NULL, AV_LOG_ERROR, "utf16 local tag size %"PRIx64" invalid (too large), ignoring\n", size);
         return;
     }
 

     mxf_write_local_tag(pb, size*2, tag);

     avio_put_str16be(pb, value);

 }
 

 static void mxf_write_identification(AVFormatContext *s)
 {

     MXFContext *mxf = s->priv_data;

     AVIOContext *pb = s->pb;

     const char *company = "FFmpeg";

     const char *product = s->oformat != &ff_mxf_opatom_muxer ? "OP1a Muxer" : "OPAtom Muxer";

     const char *version;

     int length;

 
     mxf_write_metadata_key(pb, 0x013000);
     PRINT_KEY(s, "identification key", pb->buf_ptr - 16);
 

     version = s->flags & AVFMT_FLAG_BITEXACT ?

         "0.0.0" : AV_STRINGIFY(LIBAVFORMAT_VERSION);

     length = 72 + mxf_utf16_local_tag_length(company) +
                   mxf_utf16_local_tag_length(product) +
                   mxf_utf16_local_tag_length(version);

     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);

 
     if (st == mxf->timecode_track && s->oformat == &ff_mxf_opatom_muxer){
         avio_wb32(pb, mxf->tc.rate.num);
         avio_wb32(pb, mxf->tc.rate.den);
     } else {
         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);

 
     if (st != mxf->timecode_track && s->oformat == &ff_mxf_opatom_muxer && st->codec->codec_type == AVMEDIA_TYPE_AUDIO){
         avio_wb64(pb, mxf->body_offset / mxf->edit_unit_byte_count);
     } else {
         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->tc.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->tc.flags & AV_TIMECODE_FLAG_DROPFRAME));

 }
 

 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 + 16LL * 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;

     unsigned desc_size = size+8+8+8+8+8+8+8+5+16+sc->interlaced*4+12+20+5;

     if (sc->interlaced && sc->field_dominance)
         desc_size += 5;

     if (sc->signal_standard)
         desc_size += 5;

     mxf_write_generic_desc(s, st, key, desc_size);

 
     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);

     // presentation Y offset
     mxf_write_local_tag(pb, 4, 0x320B);
     avio_wb32(pb, (st->codec->height - display_height)>>sc->interlaced);
 

     // component depth
     mxf_write_local_tag(pb, 4, 0x3301);

     avio_wb32(pb, sc->component_depth);

 
     // horizontal subsampling
     mxf_write_local_tag(pb, 4, 0x3302);

     avio_wb32(pb, sc->h_chroma_sub_sample);

     // color siting
     mxf_write_local_tag(pb, 1, 0x3303);
     avio_w8(pb, sc->color_siting);
 

     if (sc->signal_standard) {
         mxf_write_local_tag(pb, 1, 0x3215);
         avio_w8(pb, sc->signal_standard);
     }
 

     // 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 = st->codec->codec_id == AV_CODEC_ID_DVVIDEO ? 335 : 336; break;

     case  608: f1 =  7; f2 = 320; break;

     case  480: f1 = 20; f2 = st->codec->codec_id == AV_CODEC_ID_DVVIDEO ? 285 : 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);

 
     if (sc->interlaced && sc->field_dominance) {
         mxf_write_local_tag(pb, 1, 0x3212);
         avio_w8(pb, sc->field_dominance);
     }
 

 }
 

 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;

     MXFStreamContext *sc = st->priv_data;

     int profile_and_level = (st->codec->profile<<4) | st->codec->level;

     if (st->codec->codec_id != AV_CODEC_ID_H264) {

         mxf_write_cdci_common(s, st, mxf_mpegvideo_descriptor_key, 8+5);

         // bit rate
         mxf_write_local_tag(pb, 4, 0x8000);
         avio_wb32(pb, sc->video_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);

     } else {
         mxf_write_cdci_common(s, st, mxf_mpegvideo_descriptor_key, 0);
     }

 }
 
 static void mxf_write_generic_sound_common(AVFormatContext *s, AVStream *st, const UID key, unsigned size)

 {

     AVIOContext *pb = s->pb;

     MXFContext *mxf = s->priv_data;
     int show_warnings = !mxf->footer_partition_offset;

     int duration_size = 0;
 
     if (s->oformat == &ff_mxf_opatom_muxer)
         duration_size = 12;

     mxf_write_generic_desc(s, st, key, size+duration_size+5+12+8+8);
 
     if (duration_size > 0){
         mxf_write_local_tag(pb, 8, 0x3002);
         avio_wb64(pb, mxf->body_offset / mxf->edit_unit_byte_count);
     }

     // 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);

     if (mxf->channel_count == -1) {
         if (show_warnings && (s->oformat == &ff_mxf_d10_muxer) && (st->codec->channels != 4) && (st->codec->channels != 8))

             av_log(s, AV_LOG_WARNING, "the number of audio channels shall be 4 or 8 : the output will not comply to MXF D-10 specs, use -d10_channelcount to fix this\n");

         avio_wb32(pb, st->codec->channels);
     } else if (s->oformat == &ff_mxf_d10_muxer) {
         if (show_warnings && (mxf->channel_count < st->codec->channels))

             av_log(s, AV_LOG_WARNING, "d10_channelcount < actual number of audio channels : some channels will be discarded\n");

         if (show_warnings && (mxf->channel_count != 4) && (mxf->channel_count != 8))

             av_log(s, AV_LOG_WARNING, "d10_channelcount shall be set to 4 or 8 : the output will not comply to MXF D-10 specs\n");

         avio_wb32(pb, mxf->channel_count);
     } else {

         if (show_warnings && mxf->channel_count != -1 && s->oformat != &ff_mxf_opatom_muxer)

             av_log(s, AV_LOG_ERROR, "-d10_channelcount requires MXF D-10 and will be ignored\n");

         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 const uint8_t mxf_indirect_value_utf16le[] = { 0x4c,0x00,0x02,0x10,0x01,0x00,0x00,0x00,0x00,0x06,0x0e,0x2b,0x34,0x01,0x04,0x01,0x01 };
 
 static int mxf_write_tagged_value(AVFormatContext *s, const char* name, const char* value)
 {
     MXFContext *mxf = s->priv_data;
     AVIOContext *pb = s->pb;
     int name_size = mxf_utf16_local_tag_length(name);
     int indirect_value_size = 13 + mxf_utf16_local_tag_length(value);
 
     if (!name_size || indirect_value_size == 13)
         return 1;
 
     mxf_write_metadata_key(pb, 0x013f00);
     klv_encode_ber_length(pb, 24 + name_size + indirect_value_size);
 
     // write instance UID
     mxf_write_local_tag(pb, 16, 0x3C0A);
     mxf_write_uuid(pb, TaggedValue, mxf->tagged_value_count);
 
     // write name
     mxf_write_local_tag_utf16(pb, 0x5001, name); // Name
 
     // write indirect value
     mxf_write_local_tag(pb, indirect_value_size, 0x5003);
     avio_write(pb, mxf_indirect_value_utf16le, 17);
     avio_put_str16le(pb, value);
 
     mxf->tagged_value_count++;
     return 0;
 }
 
 static int mxf_write_user_comments(AVFormatContext *s, const AVDictionary *m)
 {
     MXFContext *mxf = s->priv_data;
     AVDictionaryEntry *t = NULL;
     int count = 0;
 
     while ((t = av_dict_get(m, "comment_", t, AV_DICT_IGNORE_SUFFIX))) {
         if (mxf->tagged_value_count >= UINT16_MAX) {
             av_log(s, AV_LOG_ERROR, "too many tagged values, ignoring remaining\n");
             return count;
         }
 
         if (mxf_write_tagged_value(s, t->key + 8, t->value) == 0)
             count++;
     }
     return count;
 }
 

 static void mxf_write_package(AVFormatContext *s, enum MXFMetadataSetType type, const char *package_name)

 {

     MXFContext *mxf = s->priv_data;

     AVIOContext *pb = s->pb;

     int i, track_count = s->nb_streams+1;

     int name_size = mxf_utf16_local_tag_length(package_name);

     int user_comment_count = 0;

 
     if (type == MaterialPackage) {

         if (mxf->store_user_comments)
             user_comment_count = mxf_write_user_comments(s, s->metadata);

         mxf_write_metadata_key(pb, 0x013600);
         PRINT_KEY(s, "Material Package key", pb->buf_ptr - 16);

         klv_encode_ber_length(pb, 92 + name_size + (16*track_count) + (16*user_comment_count) + 12*mxf->store_user_comments);

     } else {
         mxf_write_metadata_key(pb, 0x013700);
         PRINT_KEY(s, "Source Package key", pb->buf_ptr - 16);

         klv_encode_ber_length(pb, 112 + name_size + (16*track_count) + 12*mxf->store_user_comments); // 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 name
     if (name_size)
         mxf_write_local_tag_utf16(pb, 0x4402, package_name);
 

     // 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 user comment refs

     if (mxf->store_user_comments) {
         mxf_write_local_tag(pb, user_comment_count*16 + 8, 0x4406);
         mxf_write_refs_count(pb, user_comment_count);
         for (i = 0; i < user_comment_count; i++)
             mxf_write_uuid(pb, TaggedValue, mxf->tagged_value_count - user_comment_count + 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)
 {

     const char *material_package_name = NULL;
     const char *file_package_name = NULL;
     AVDictionaryEntry *entry = NULL;
     AVStream *st = NULL;
     int i;
 
     if (entry = av_dict_get(s->metadata, "material_package_name", NULL, 0))
        material_package_name = entry->value;
 
     if (entry = av_dict_get(s->metadata, "file_package_name", NULL, 0)) {
         file_package_name = entry->value;
     } else {
         /* check if any of the streams contain a file_package_name */
         for (i = 0; i < s->nb_streams; i++) {
             st = s->streams[i];
             if (entry = av_dict_get(st->metadata, "file_package_name", NULL, 0)) {
                 file_package_name = entry->value;
                 break;
             }
         }
     }
 

     mxf_write_preface(s);

     mxf_write_identification(s);
     mxf_write_content_storage(s);

     mxf_write_package(s, MaterialPackage, material_package_name);
     mxf_write_package(s, SourcePackage, file_package_name);

     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+1LL)*6 +
                               12+mxf->edit_units_count*(11+mxf->slice_count*4LL));

     }

 
     // 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);

         ffio_fill(s->pb, 0, pad);

         av_assert1(!(avio_tell(s->pb) & (KAG_SIZE-1)));

     }
 }
 

 static int 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);

     int err;

     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 (key && !memcmp(key, body_partition_key, 16)) {

         if ((err = av_reallocp_array(&mxf->body_partition_offset, mxf->body_partitions_count + 1,
                                      sizeof(*mxf->body_partition_offset))) < 0) {
             mxf->body_partitions_count = 0;
             return err;
         }

         mxf->body_partition_offset[mxf->body_partitions_count++] = partition_offset;

     }

     // write klv

     if (key)
         avio_write(pb, key, 16);
     else
         avio_write(pb, body_partition_key, 16);
 

     klv_encode_ber_length(pb, 88 + 16LL * DESCRIPTOR_COUNT(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 (key && !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 (key && !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 && s->oformat != &ff_mxf_opatom_muxer)

         avio_wb64(pb, mxf->body_offset);

     else

         avio_wb64(pb, 0);

     avio_wb32(pb, bodysid); // bodySID

 
     // operational pattern

     if (s->oformat == &ff_mxf_opatom_muxer)
         avio_write(pb, opatom_ul, 16);
     else
         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);

     }
 

     if(key)
         avio_flush(pb);

 
     return 0;

 }
 

 static int mxf_parse_dnxhd_frame(AVFormatContext *s, AVStream *st,
 AVPacket *pkt)
 {
     MXFContext *mxf = s->priv_data;
     MXFStreamContext *sc = st->priv_data;
     int i, cid;
     uint8_t* header_cid;

     int frame_size = 0;

 
     if (mxf->header_written)
         return 1;
 
     if (pkt->size < 43)
         return -1;
 
     header_cid = pkt->data + 0x28;
     cid = header_cid[0] << 24 | header_cid[1] << 16 | header_cid[2] << 8 | header_cid[3];
 

     if ((frame_size = avpriv_dnxhd_get_frame_size(cid)) < 0)

         return -1;

     if ((sc->interlaced = avpriv_dnxhd_get_interlaced(cid)) < 0)
         return AVERROR_INVALIDDATA;

 
     switch (cid) {
     case 1235:
         sc->index = 24;
         sc->component_depth = 10;
         break;
     case 1237:
         sc->index = 25;
         break;
     case 1238:
         sc->index = 26;
         break;
     case 1241:
         sc->index = 27;
         sc->component_depth = 10;
         break;
     case 1242:
         sc->index = 28;
         break;
     case 1243:
         sc->index = 29;
         break;
     case 1250:
         sc->index = 30;
         sc->component_depth = 10;
         break;
     case 1251:
         sc->index = 31;
         break;
     case 1252:
         sc->index = 32;
         break;
     case 1253:
         sc->index = 33;
         break;
     default:
         return -1;
     }
 

     sc->codec_ul = &mxf_essence_container_uls[sc->index].codec_ul;
     sc->aspect_ratio = (AVRational){ 16, 9 };

     if(s->oformat == &ff_mxf_opatom_muxer){
         mxf->edit_unit_byte_count = frame_size;
         return 1;
     }
 

     mxf->edit_unit_byte_count = KAG_SIZE;
     for (i = 0; i < s->nb_streams; i++) {
         AVStream *st = s->streams[i];
         MXFStreamContext *sc = st->priv_data;
         if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
             mxf->edit_unit_byte_count += 16 + 4 + sc->aic.samples[0]*sc->aic.sample_size;
             mxf->edit_unit_byte_count += klv_fill_size(mxf->edit_unit_byte_count);
         } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
             mxf->edit_unit_byte_count += 16 + 4 + frame_size;
             mxf->edit_unit_byte_count += klv_fill_size(mxf->edit_unit_byte_count);
         }
     }
 
     return 1;
 }
 

 static int mxf_parse_dv_frame(AVFormatContext *s, AVStream *st, AVPacket *pkt)
 {
     MXFContext *mxf = s->priv_data;
     MXFStreamContext *sc = st->priv_data;
     uint8_t *vs_pack, *vsc_pack;
     int i, ul_index, frame_size, stype, pal;
 
     if (mxf->header_written)
         return 1;
 
     // Check for minimal frame size
     if (pkt->size < 120000)
         return -1;
 
     vs_pack  = pkt->data + 80*5 + 48;
     vsc_pack = pkt->data + 80*5 + 53;
     stype    = vs_pack[3] & 0x1f;
     pal      = (vs_pack[3] >> 5) & 0x1;
 
     if ((vs_pack[2] & 0x07) == 0x02)
         sc->aspect_ratio = (AVRational){ 16, 9 };
     else
         sc->aspect_ratio = (AVRational){ 4, 3 };
 
     sc->interlaced = (vsc_pack[3] >> 4) & 0x01;
     // TODO: fix dv encoder to set proper FF/FS value in VSC pack
     // and set field dominance accordingly
     // av_log(s, AV_LOG_DEBUG, "DV vsc pack ff/ss = %x\n", vsc_pack[2] >> 6);
 
     switch (stype) {
     case 0x18: // DV100 720p
         ul_index = 6 + pal;
         frame_size = pal ? 288000 : 240000;
         if (sc->interlaced) {

             av_log(s, AV_LOG_ERROR, "source marked as interlaced but codec profile is progressive\n");

             sc->interlaced = 0;
         }
         break;
     case 0x14: // DV100 1080i
         ul_index = 4 + pal;
         frame_size = pal ? 576000 : 480000;
         break;
     case 0x04: // DV50
         ul_index = 2 + pal;
         frame_size = pal ? 288000 : 240000;
         break;
     default: // DV25
         ul_index = 0 + pal;
         frame_size = pal ? 144000 : 120000;
     }
 
     sc->index = ul_index + 16;
     sc->codec_ul =  &mxf_essence_container_uls[sc->index].codec_ul;
 

     if(s->oformat == &ff_mxf_opatom_muxer) {
         mxf->edit_unit_byte_count = frame_size;
         return 1;
     }
 

     mxf->edit_unit_byte_count = KAG_SIZE;
     for (i = 0; i < s->nb_streams; i++) {
         AVStream *st = s->streams[i];
         MXFStreamContext *sc = st->priv_data;
         if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
             mxf->edit_unit_byte_count += 16 + 4 + sc->aic.samples[0]*sc->aic.sample_size;
             mxf->edit_unit_byte_count += klv_fill_size(mxf->edit_unit_byte_count);
         } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
             mxf->edit_unit_byte_count += 16 + 4 + frame_size;
             mxf->edit_unit_byte_count += klv_fill_size(mxf->edit_unit_byte_count);
         }
     }
 
     return 1;
 }
 

 static const struct {
     UID uid;
     int frame_size;
     int profile;
     uint8_t interlaced;
 } mxf_h264_codec_uls[] = {
     {{ 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x20,0x01 },      0, 110, 0 }, // AVC High 10 Intra
     {{ 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x21,0x01 }, 232960,   0, 1 }, // AVC Intra 50 1080i60
     {{ 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x21,0x02 }, 281088,   0, 1 }, // AVC Intra 50 1080i50
     {{ 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x21,0x03 }, 232960,   0, 0 }, // AVC Intra 50 1080p30
     {{ 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x21,0x04 }, 281088,   0, 0 }, // AVC Intra 50 1080p25
     {{ 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x21,0x08 }, 116736,   0, 0 }, // AVC Intra 50 720p60
     {{ 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x21,0x09 }, 140800,   0, 0 }, // AVC Intra 50 720p50
     {{ 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x30,0x01 },      0, 122, 0 }, // AVC High 422 Intra
     {{ 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x31,0x01 }, 472576,   0, 1 }, // AVC Intra 100 1080i60
     {{ 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x31,0x02 }, 568832,   0, 1 }, // AVC Intra 100 1080i50
     {{ 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x31,0x03 }, 472576,   0, 0 }, // AVC Intra 100 1080p30
     {{ 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x31,0x04 }, 568832,   0, 0 }, // AVC Intra 100 1080p25
     {{ 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x31,0x08 }, 236544,   0, 0 }, // AVC Intra 100 720p60
     {{ 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0a,0x04,0x01,0x02,0x02,0x01,0x32,0x31,0x09 }, 284672,   0, 0 }, // AVC Intra 100 720p50
 };
 
 static int mxf_parse_h264_frame(AVFormatContext *s, AVStream *st,
                                 AVPacket *pkt, MXFIndexEntry *e)
 {
     MXFContext *mxf = s->priv_data;
     MXFStreamContext *sc = st->priv_data;
     static const int mxf_h264_num_codec_uls = sizeof(mxf_h264_codec_uls) / sizeof(mxf_h264_codec_uls[0]);
     const uint8_t *buf = pkt->data;
     const uint8_t *buf_end = pkt->data + pkt->size;
     uint32_t state = -1;
     int extra_size = 512; // support AVC Intra files without SPS/PPS header
     int i, frame_size;
     uint8_t uid_found;
 
     if (pkt->size > extra_size)
         buf_end -= pkt->size - extra_size; // no need to parse beyond SPS/PPS header
 
     for (;;) {
         buf = avpriv_find_start_code(buf, buf_end, &state);
         if (buf >= buf_end)
             break;
         --buf;
         switch (state & 0x1f) {
         case NAL_SPS:
             st->codec->profile = buf[1];
             e->flags |= 0x40;
             break;
         case NAL_PPS:
             if (e->flags & 0x40) { // sequence header present
                 e->flags |= 0x80; // random access
                 extra_size = 0;
                 buf = buf_end;
             }
             break;
         default:
             break;
         }
     }
 
     if (mxf->header_written)
         return 1;
 
     sc->aspect_ratio = (AVRational){ 16, 9 }; // 16:9 is mandatory for broadcast HD
     sc->component_depth = 10; // AVC Intra is always 10 Bit
     sc->interlaced = st->codec->field_order != AV_FIELD_PROGRESSIVE ? 1 : 0;
     if (sc->interlaced)
         sc->field_dominance = 1; // top field first is mandatory for AVC Intra
 
     uid_found = 0;
     frame_size = pkt->size + extra_size;
     for (i = 0; i < mxf_h264_num_codec_uls; i++) {
         if (frame_size == mxf_h264_codec_uls[i].frame_size && sc->interlaced == mxf_h264_codec_uls[i].interlaced) {
             sc->codec_ul = &mxf_h264_codec_uls[i].uid;
             return 1;
         } else if (st->codec->profile == mxf_h264_codec_uls[i].profile) {
             sc->codec_ul = &mxf_h264_codec_uls[i].uid;
             uid_found = 1;
         }
     }
 
     if (!uid_found) {
         av_log(s, AV_LOG_ERROR, "AVC Intra 50/100 supported only\n");
         return 0;
     }
 
     return 1;
 }
 

 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

     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x05,0x02,0x00 }, // MP@H-14 I-Frame
     { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x05,0x03,0x00 }, // MP@H-14 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->level == 6) // High 14
             return &mxf_mpeg2_codec_uls[8+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;
     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

                 if (sc->interlaced)
                     sc->field_dominance = 1 + !(pkt->data[i+4] & 0x80); // top field first

                 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

             }

         } 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 tmbuf;
     struct tm *time = gmtime_r(&timestamp, &tmbuf);

     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 & 0xFFFFFF;

 }
 

 static int mxf_init_timecode(AVFormatContext *s, AVStream *st, AVRational rate)
 {
     MXFContext *mxf = s->priv_data;
     AVDictionaryEntry *tcr = av_dict_get(s->metadata, "timecode", NULL, 0);
     if (!tcr)
         tcr = av_dict_get(st->metadata, "timecode", NULL, 0);
 
     if (tcr)
         return av_timecode_init_from_string(&mxf->tc, rate, tcr->value, s);
     else
         return av_timecode_init(&mxf->tc, rate, 0, 0, s);
 }
 

 static int mxf_write_header(AVFormatContext *s)

 {
     MXFContext *mxf = s->priv_data;

     int i, ret;

     uint8_t present[FF_ARRAY_ELEMS(mxf_essence_container_uls)] = {0};

     const MXFSamplesPerFrame *spf = NULL;

     AVDictionaryEntry *t;
     int64_t timestamp = 0;

     if (!s->nb_streams)
         return -1;
 

     if (s->oformat == &ff_mxf_opatom_muxer && s->nb_streams !=1){
         av_log(s, AV_LOG_ERROR, "there must be exactly one stream for mxf opatom\n");
         return -1;
     }
 

     if (!av_dict_get(s->metadata, "comment_", NULL, AV_DICT_IGNORE_SUFFIX))
         mxf->store_user_comments = 0;
 

     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 (((i == 0) ^ (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)) && s->oformat != &ff_mxf_opatom_muxer) {

             av_log(s, AV_LOG_ERROR, "there must be exactly one video stream and it must be the first one\n");
             return -1;
         }
 

         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

             const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(st->codec->pix_fmt);

             // TODO: should be avg_frame_rate

             AVRational rate, tbc = st->time_base;

             // Default component depth to 8
             sc->component_depth = 8;

             sc->h_chroma_sub_sample = 2;

             sc->color_siting = 0xFF;

 
             if (pix_desc) {

                 sc->component_depth     = pix_desc->comp[0].depth_minus1 + 1;
                 sc->h_chroma_sub_sample = 1 << pix_desc->log2_chroma_w;

             }

             switch (ff_choose_chroma_location(s, st)) {
             case AVCHROMA_LOC_TOPLEFT: sc->color_siting = 0; break;
             case AVCHROMA_LOC_LEFT:    sc->color_siting = 6; break;
             case AVCHROMA_LOC_TOP:     sc->color_siting = 1; break;
             case AVCHROMA_LOC_CENTER:  sc->color_siting = 3; break;
             }

             mxf->timecode_base = (tbc.den + tbc.num/2) / tbc.num;

             spf = ff_mxf_get_samples_per_frame(s, tbc);

             if (!spf) {

                 av_log(s, AV_LOG_ERROR, "Unsupported video frame rate %d/%d\n",
                        tbc.den, tbc.num);
                 return AVERROR(EINVAL);

             }

             mxf->time_base = spf->time_base;

             rate = av_inv_q(mxf->time_base);

             avpriv_set_pts_info(st, 64, mxf->time_base.num, mxf->time_base.den);

             if((ret = mxf_init_timecode(s, st, rate)) < 0)

                 return ret;

             sc->video_bit_rate = st->codec->bit_rate ? st->codec->bit_rate : st->codec->rc_max_rate;

             if (s->oformat == &ff_mxf_d10_muxer) {

                 if ((sc->video_bit_rate == 50000000) && (mxf->time_base.den == 25)) {
                     sc->index = 3;
                 } else if ((sc->video_bit_rate == 49999840 || sc->video_bit_rate == 50000000) && (mxf->time_base.den != 25)) {
                     sc->index = 5;

                 } else if (sc->video_bit_rate == 40000000) {

                     if (mxf->time_base.den == 25) sc->index = 7;
                     else                          sc->index = 9;

                 } else if (sc->video_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)sc->video_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 + spf->samples_per_frame[0]*8*4;

                 mxf->edit_unit_byte_count += klv_fill_size(mxf->edit_unit_byte_count);

 
                 sc->signal_standard = 1;

             }

             if (mxf->signal_standard >= 0)
                 sc->signal_standard = mxf->signal_standard;

         } 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;
             }

             avpriv_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 != AV_CODEC_ID_PCM_S16LE &&
                     st->codec->codec_id != AV_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 if (s->oformat == &ff_mxf_opatom_muxer) {
                 AVRational tbc = av_inv_q(mxf->audio_edit_rate);
 
                 if (st->codec->codec_id != AV_CODEC_ID_PCM_S16LE &&
                     st->codec->codec_id != AV_CODEC_ID_PCM_S24LE) {
                     av_log(s, AV_LOG_ERROR, "Only pcm_s16le and pcm_s24le audio codecs are implemented\n");
                     return AVERROR_PATCHWELCOME;
                 }
                 if (st->codec->channels != 1) {
                     av_log(s, AV_LOG_ERROR, "MXF OPAtom only supports single channel audio\n");
                     return AVERROR(EINVAL);
                 }
 
                 spf = ff_mxf_get_samples_per_frame(s, tbc);
                 if (!spf){
                     av_log(s, AV_LOG_ERROR, "Unsupported timecode frame rate %d/%d\n", tbc.den, tbc.num);
                     return AVERROR(EINVAL);
                 }
 
                 mxf->time_base = st->time_base;
                 if((ret = mxf_init_timecode(s, st, av_inv_q(spf->time_base))) < 0)
                     return ret;
 
                 mxf->timecode_base = (tbc.den + tbc.num/2) / tbc.num;
                 mxf->edit_unit_byte_count = (av_get_bits_per_sample(st->codec->codec_id) * st->codec->channels) >> 3;
                 sc->index = 2;
             } 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 || s->oformat == &ff_mxf_opatom_muxer) {

         mxf->essence_container_count = 1;
     }
 

     if (!(s->flags & AVFMT_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];

         if (!memcmp(sc->track_essence_element_key, mxf_essence_container_uls[15].element_ul, 13)) // DV
             sc->order = (0x15 << 24) | AV_RB32(sc->track_essence_element_key+13);
         else
             sc->order = AV_RB32(sc->track_essence_element_key+12);

     }
 

     if (t = av_dict_get(s->metadata, "creation_time", NULL, 0))
         timestamp = ff_iso8601_to_unix_time(t->value);

     if (timestamp)
         mxf->timestamp = mxf_parse_timestamp(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 (!spf)

         spf = ff_mxf_get_samples_per_frame(s, (AVRational){ 1, 25 });

     if (ff_audio_interleave_init(s, spf->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 void mxf_write_system_item(AVFormatContext *s)
 {
     MXFContext *mxf = s->priv_data;

     AVIOContext *pb = s->pb;

     unsigned frame;

     uint32_t time_code;
 

     frame = 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, (mxf->tc.start + frame) & 0xFFFF); // continuity count, supposed to overflow

     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 = av_timecode_get_smpte_from_framenum(&mxf->tc, frame);

     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;

     MXFStreamContext *sc = st->priv_data;
     int packet_size = (uint64_t)sc->video_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);

         ffio_fill(s->pb, 0, pad);

         av_assert1(!(avio_tell(s->pb) & (KAG_SIZE-1)));

     } else {
         av_log(s, AV_LOG_WARNING, "cannot fill d-10 video packet\n");

         ffio_fill(s->pb, 0, pad);

     }
 }
 
 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 == AV_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_opatom_body_partition(AVFormatContext *s)
 {
     MXFContext *mxf = s->priv_data;
     AVIOContext *pb = s->pb;
     AVStream *st = s->streams[0];
     MXFStreamContext *sc = st->priv_data;
     const uint8_t *key = NULL;
 
     int err;
 
     if (!mxf->header_written)
         key = body_partition_key;
 
     if ((err = mxf_write_partition(s, 1, 0, key, 0)) < 0)
         return err;
     mxf_write_klv_fill(s);
     avio_write(pb, sc->track_essence_element_key, 16);
     klv_encode_ber9_length(pb, mxf->body_offset);
     return 0;
 }
 
 static int mxf_write_opatom_packet(AVFormatContext *s, AVPacket *pkt, MXFIndexEntry *ie)
 {
     MXFContext *mxf = s->priv_data;
     AVIOContext *pb = s->pb;
 
     int err;
 
     if (!mxf->header_written) {
         if ((err = mxf_write_partition(s, 0, 0, header_open_partition_key, 1)) < 0)
             return err;
         mxf_write_klv_fill(s);
 
         if ((err = mxf_write_opatom_body_partition(s)) < 0)
             return err;
         mxf->header_written = 1;
     }
 
     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->edit_units_count++;
     avio_write(pb, pkt->data, pkt->size);
     mxf->body_offset += pkt->size;
     avio_flush(pb);
 
     return 0;
 }
 

 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};

     int err;

     if (!mxf->edit_unit_byte_count && !(mxf->edit_units_count % EDIT_UNITS_PER_BODY)) {

         if ((err = av_reallocp_array(&mxf->index_entries, mxf->edit_units_count
                                      + EDIT_UNITS_PER_BODY, sizeof(*mxf->index_entries))) < 0) {
             mxf->edit_units_count = 0;

             av_log(s, AV_LOG_ERROR, "could not allocate index entries\n");

             return err;

         }
     }
 

     if (st->codec->codec_id == AV_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;

         }

     } else if (st->codec->codec_id == AV_CODEC_ID_DNXHD) {

         if (!mxf_parse_dnxhd_frame(s, st, pkt)) {
             av_log(s, AV_LOG_ERROR, "could not get dnxhd profile\n");
             return -1;
         }

     } else if (st->codec->codec_id == AV_CODEC_ID_DVVIDEO) {

         if (!mxf_parse_dv_frame(s, st, pkt)) {
             av_log(s, AV_LOG_ERROR, "could not get dv profile\n");
             return -1;
         }

     } else if (st->codec->codec_id == AV_CODEC_ID_H264) {
         if (!mxf_parse_h264_frame(s, st, pkt, &ie)) {
             av_log(s, AV_LOG_ERROR, "could not get h264 profile\n");
             return -1;
         }

     }
 

     if (s->oformat == &ff_mxf_opatom_muxer)
         return mxf_write_opatom_packet(s, pkt, &ie);
 

     if (!mxf->header_written) {

         if (mxf->edit_unit_byte_count) {

             if ((err = mxf_write_partition(s, 1, 2, header_open_partition_key, 1)) < 0)
                 return err;

             mxf_write_klv_fill(s);
             mxf_write_index_table_segment(s);
         } else {

             if ((err = mxf_write_partition(s, 0, 0, header_open_partition_key, 1)) < 0)
                 return err;

         }

         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);

             if ((err = mxf_write_partition(s, 1, 2, body_partition_key, 0)) < 0)
                 return err;

             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 + 12LL*mxf->body_partitions_count);

     if (mxf->edit_unit_byte_count && s->oformat != &ff_mxf_opatom_muxer)

         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;

     int err = 0;

     if (!mxf->header_written ||
         (s->oformat == &ff_mxf_opatom_muxer && !mxf->body_partition_offset)) {
         /* reason could be invalid options/not supported codec/out of memory */
         err = AVERROR_UNKNOWN;
         goto end;
     }
 

     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 && s->oformat != &ff_mxf_opatom_muxer) { // no need to repeat index

         if ((err = mxf_write_partition(s, 0, 0, footer_partition_key, 0)) < 0)

             goto end;

     } else {

         if ((err = mxf_write_partition(s, 0, 2, footer_partition_key, 0)) < 0)

             goto end;

         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) {

         if (s->oformat == &ff_mxf_opatom_muxer){
             /* rewrite body partition to update lengths */
             avio_seek(pb, mxf->body_partition_offset[0], SEEK_SET);
             if ((err = mxf_write_opatom_body_partition(s)) < 0)

                 goto end;

         }
 

         avio_seek(pb, 0, SEEK_SET);

         if (mxf->edit_unit_byte_count && s->oformat != &ff_mxf_opatom_muxer) {

             if ((err = mxf_write_partition(s, 1, 2, header_closed_partition_key, 1)) < 0)

                 goto end;

             mxf_write_klv_fill(s);
             mxf_write_index_table_segment(s);

         } else {

             if ((err = mxf_write_partition(s, 0, 0, header_closed_partition_key, 1)) < 0)

                 goto end;

         }

     }

 end:

     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 err < 0 ? err : 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->internal->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->internal->packet_buffer = NULL;
                 s->internal->packet_buffer_end= NULL;

                 goto out;

             }

             pktl = s->internal->packet_buffer;

         }
 

         *out = pktl->pkt;

         av_log(s, AV_LOG_TRACE, "out st:%d dts:%"PRId64"\n", (*out).stream_index, (*out).dts);

         s->internal->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->internal->packet_buffer)
             s->internal->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);

 }
 

 #define MXF_COMMON_OPTIONS \
     { "signal_standard", "Force/set Sigal Standard",\
       offsetof(MXFContext, signal_standard), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 7, AV_OPT_FLAG_ENCODING_PARAM, "signal_standard"},\
     { "bt601", "ITU-R BT.601 and BT.656, also SMPTE 125M (525 and 625 line interlaced)",\
       0, AV_OPT_TYPE_CONST, {.i64 = 1}, -1, 7, AV_OPT_FLAG_ENCODING_PARAM, "signal_standard"},\
     { "bt1358", "ITU-R BT.1358 and ITU-R BT.799-3, also SMPTE 293M (525 and 625 line progressive)",\
       0, AV_OPT_TYPE_CONST, {.i64 = 2}, -1, 7, AV_OPT_FLAG_ENCODING_PARAM, "signal_standard"},\
     { "smpte347m", "SMPTE 347M (540 Mbps mappings)",\
       0, AV_OPT_TYPE_CONST, {.i64 = 3}, -1, 7, AV_OPT_FLAG_ENCODING_PARAM, "signal_standard"},\
     { "smpte274m", "SMPTE 274M (1125 line)",\
       0, AV_OPT_TYPE_CONST, {.i64 = 4}, -1, 7, AV_OPT_FLAG_ENCODING_PARAM, "signal_standard"},\
     { "smpte296m", "SMPTE 296M (750 line progressive)",\
       0, AV_OPT_TYPE_CONST, {.i64 = 5}, -1, 7, AV_OPT_FLAG_ENCODING_PARAM, "signal_standard"},\
     { "smpte349m", "SMPTE 349M (1485 Mbps mappings)",\
       0, AV_OPT_TYPE_CONST, {.i64 = 6}, -1, 7, AV_OPT_FLAG_ENCODING_PARAM, "signal_standard"},\
     { "smpte428", "SMPTE 428-1 DCDM",\
       0, AV_OPT_TYPE_CONST, {.i64 = 7}, -1, 7, AV_OPT_FLAG_ENCODING_PARAM, "signal_standard"},
 
 
 

 static const AVOption mxf_options[] = {

     MXF_COMMON_OPTIONS

     { "store_user_comments", "",
       offsetof(MXFContext, store_user_comments), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},

     { NULL },
 };
 
 static const AVClass mxf_muxer_class = {
     .class_name     = "MXF muxer",
     .item_name      = av_default_item_name,
     .option         = mxf_options,
     .version        = LIBAVUTIL_VERSION_INT,
 };
 

 static const AVOption d10_options[] = {

     { "d10_channelcount", "Force/set channelcount in generic sound essence descriptor",

       offsetof(MXFContext, channel_count), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 8, AV_OPT_FLAG_ENCODING_PARAM},

     MXF_COMMON_OPTIONS

     { "store_user_comments", "",
       offsetof(MXFContext, store_user_comments), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},

     { NULL },
 };
 
 static const AVClass mxf_d10_muxer_class = {
     .class_name     = "MXF-D10 muxer",
     .item_name      = av_default_item_name,
     .option         = d10_options,
     .version        = LIBAVUTIL_VERSION_INT,
 };
 

 static const AVOption opatom_options[] = {
     { "mxf_audio_edit_rate", "Audio edit rate for timecode",
         offsetof(MXFContext, audio_edit_rate), AV_OPT_TYPE_RATIONAL, {.dbl=25}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },

     MXF_COMMON_OPTIONS

     { NULL },
 };
 
 static const AVClass mxf_opatom_muxer_class = {
     .class_name     = "MXF-OPAtom muxer",
     .item_name      = av_default_item_name,
     .option         = opatom_options,
     .version        = LIBAVUTIL_VERSION_INT,
 };
 

 AVOutputFormat ff_mxf_muxer = {

     .name              = "mxf",

     .long_name         = NULL_IF_CONFIG_SMALL("MXF (Material eXchange Format)"),

     .mime_type         = "application/mxf",
     .extensions        = "mxf",
     .priv_data_size    = sizeof(MXFContext),

     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
     .video_codec       = AV_CODEC_ID_MPEG2VIDEO,

     .write_header      = mxf_write_header,
     .write_packet      = mxf_write_packet,
     .write_trailer     = mxf_write_footer,
     .flags             = AVFMT_NOTIMESTAMPS,
     .interleave_packet = mxf_interleave,

     .priv_class        = &mxf_muxer_class,

 };

 AVOutputFormat ff_mxf_d10_muxer = {

     .name              = "mxf_d10",

     .long_name         = NULL_IF_CONFIG_SMALL("MXF (Material eXchange Format) D-10 Mapping"),

     .mime_type         = "application/mxf",
     .priv_data_size    = sizeof(MXFContext),

     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
     .video_codec       = AV_CODEC_ID_MPEG2VIDEO,

     .write_header      = mxf_write_header,
     .write_packet      = mxf_write_packet,
     .write_trailer     = mxf_write_footer,
     .flags             = AVFMT_NOTIMESTAMPS,
     .interleave_packet = mxf_interleave,

     .priv_class        = &mxf_d10_muxer_class,

 };

 
 AVOutputFormat ff_mxf_opatom_muxer = {
     .name              = "mxf_opatom",
     .long_name         = NULL_IF_CONFIG_SMALL("MXF (Material eXchange Format) Operational Pattern Atom"),
     .mime_type         = "application/mxf",
     .extensions        = "mxf",
     .priv_data_size    = sizeof(MXFContext),
     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
     .video_codec       = AV_CODEC_ID_DNXHD,
     .write_header      = mxf_write_header,
     .write_packet      = mxf_write_packet,
     .write_trailer     = mxf_write_footer,
     .flags             = AVFMT_NOTIMESTAMPS,
     .interleave_packet = mxf_interleave,

     .priv_class        = &mxf_opatom_muxer_class,

 };