/*
  * MXF demuxer.

  * Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>

  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
  * References
  * SMPTE 336M KLV Data Encoding Protocol Using Key-Length-Value
  * SMPTE 377M MXF File Format Specifications
  * SMPTE 378M Operational Pattern 1a
  * SMPTE 379M MXF Generic Container
  * SMPTE 381M Mapping MPEG Streams into the MXF Generic Container
  * SMPTE 382M Mapping AES3 and Broadcast Wave Audio into the MXF Generic Container
  * SMPTE 383M Mapping DV-DIF Data to the MXF Generic Container
  *
  * Principle
  * Search for Track numbers which will identify essence element KLV packets.
  * Search for SourcePackage which define tracks which contains Track numbers.
  * Material Package contains tracks with reference to SourcePackage tracks.
  * Search for Descriptors (Picture, Sound) which contains codec info and parameters.
  * Assign Descriptors to correct Tracks.
  *
  * Metadata reading functions read Local Tags, get InstanceUID(0x3C0A) then add MetaDataSet to MXFContext.
  * Metadata parsing resolves Strong References to objects.
  *
  * Simple demuxer, only OP1A supported and some files might not work at all.
  * Only tracks with associated descriptors will be decoded. "Highly Desirable" SMPTE 377M D.1
  */
 
 //#define DEBUG
 
 #include "libavutil/aes.h"

 #include "libavcodec/bytestream.h"
 #include "avformat.h"

 #include "mxf.h"

 
 typedef struct {
     UID uid;
     enum MXFMetadataSetType type;
     UID source_container_ul;
 } MXFCryptoContext;
 
 typedef struct {
     UID uid;
     enum MXFMetadataSetType type;
     UID source_package_uid;
     UID data_definition_ul;
     int64_t duration;
     int64_t start_position;
     int source_track_id;
 } MXFStructuralComponent;
 
 typedef struct {
     UID uid;
     enum MXFMetadataSetType type;
     UID data_definition_ul;
     UID *structural_components_refs;
     int structural_components_count;
     int64_t duration;
 } MXFSequence;
 
 typedef struct {
     UID uid;
     enum MXFMetadataSetType type;
     MXFSequence *sequence; /* mandatory, and only one */
     UID sequence_ref;
     int track_id;
     uint8_t track_number[4];
     AVRational edit_rate;
 } MXFTrack;
 
 typedef struct {
     UID uid;
     enum MXFMetadataSetType type;
     UID essence_container_ul;
     UID essence_codec_ul;
     AVRational sample_rate;
     AVRational aspect_ratio;
     int width;
     int height;
     int channels;
     int bits_per_sample;
     UID *sub_descriptors_refs;
     int sub_descriptors_count;
     int linked_track_id;
     uint8_t *extradata;
     int extradata_size;
 } MXFDescriptor;
 
 typedef struct {
     UID uid;
     enum MXFMetadataSetType type;

 } MXFIndexTableSegment;
 
 typedef struct {
     UID uid;
     enum MXFMetadataSetType type;

     UID package_uid;
     UID *tracks_refs;
     int tracks_count;
     MXFDescriptor *descriptor; /* only one */
     UID descriptor_ref;
 } MXFPackage;
 
 typedef struct {
     UID uid;
     enum MXFMetadataSetType type;
 } MXFMetadataSet;
 
 typedef struct {
     UID *packages_refs;
     int packages_count;
     MXFMetadataSet **metadata_sets;
     int metadata_sets_count;
     AVFormatContext *fc;
     struct AVAES *aesc;
     uint8_t *local_tags;
     int local_tags_count;
 } MXFContext;
 
 enum MXFWrappingScheme {
     Frame,
     Clip,
 };
 
 typedef struct {
     const UID key;
     int (*read)();
     int ctx_size;
     enum MXFMetadataSetType type;
 } MXFMetadataReadTableEntry;
 
 /* partial keys to match */
 static const uint8_t mxf_header_partition_pack_key[]       = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02 };
 static const uint8_t mxf_essence_element_key[]             = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01 };
 static const uint8_t mxf_klv_key[]                         = { 0x06,0x0e,0x2b,0x34 };
 /* complete keys to match */
 static const uint8_t mxf_crypto_source_container_ul[]      = { 0x06,0x0e,0x2b,0x34,0x01,0x01,0x01,0x09,0x06,0x01,0x01,0x02,0x02,0x00,0x00,0x00 };
 static const uint8_t mxf_encrypted_triplet_key[]           = { 0x06,0x0e,0x2b,0x34,0x02,0x04,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x7e,0x01,0x00 };
 static const uint8_t mxf_encrypted_essence_container[]     = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x0b,0x01,0x00 };
 static const uint8_t mxf_sony_mpeg4_extradata[]            = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0e,0x06,0x06,0x02,0x02,0x01,0x00,0x00 };
 
 #define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y)))
 
 static int64_t klv_decode_ber_length(ByteIOContext *pb)
 {
     uint64_t size = get_byte(pb);
     if (size & 0x80) { /* long form */
         int bytes_num = size & 0x7f;
         /* SMPTE 379M 5.3.4 guarantee that bytes_num must not exceed 8 bytes */
         if (bytes_num > 8)
             return -1;
         size = 0;
         while (bytes_num--)
             size = size << 8 | get_byte(pb);
     }
     return size;
 }
 
 static int mxf_read_sync(ByteIOContext *pb, const uint8_t *key, unsigned size)
 {
     int i, b;
     for (i = 0; i < size && !url_feof(pb); i++) {
         b = get_byte(pb);
         if (b == key[0])
             i = 0;
         else if (b != key[i])
             i = -1;
     }
     return i == size;
 }
 
 static int klv_read_packet(KLVPacket *klv, ByteIOContext *pb)
 {
     if (!mxf_read_sync(pb, mxf_klv_key, 4))
         return -1;
     klv->offset = url_ftell(pb) - 4;
     memcpy(klv->key, mxf_klv_key, 4);
     get_buffer(pb, klv->key + 4, 12);
     klv->length = klv_decode_ber_length(pb);
     return klv->length == -1 ? -1 : 0;
 }
 
 static int mxf_get_stream_index(AVFormatContext *s, KLVPacket *klv)
 {
     int i;
 
     for (i = 0; i < s->nb_streams; i++) {
         MXFTrack *track = s->streams[i]->priv_data;
         /* SMPTE 379M 7.3 */
         if (!memcmp(klv->key + sizeof(mxf_essence_element_key), track->track_number, sizeof(track->track_number)))
             return i;
     }
     /* return 0 if only one stream, for OP Atom files with 0 as track number */
     return s->nb_streams == 1 ? 0 : -1;
 }
 
 /* XXX: use AVBitStreamFilter */
 static int mxf_get_d10_aes3_packet(ByteIOContext *pb, AVStream *st, AVPacket *pkt, int64_t length)
 {
     uint8_t buffer[61444];
     const uint8_t *buf_ptr, *end_ptr;
     uint8_t *data_ptr;
     int i;
 
     if (length > 61444) /* worst case PAL 1920 samples 8 channels */
         return -1;
     get_buffer(pb, buffer, length);
     av_new_packet(pkt, length);
     data_ptr = pkt->data;
     end_ptr = buffer + length;
     buf_ptr = buffer + 4; /* skip SMPTE 331M header */
     for (; buf_ptr < end_ptr; ) {
         for (i = 0; i < st->codec->channels; i++) {
             uint32_t sample = bytestream_get_le32(&buf_ptr);

             if (st->codec->bits_per_coded_sample == 24)

                 bytestream_put_le24(&data_ptr, (sample >> 4) & 0xffffff);
             else
                 bytestream_put_le16(&data_ptr, (sample >> 12) & 0xffff);
         }
         buf_ptr += 32 - st->codec->channels*4; // always 8 channels stored SMPTE 331M
     }
     pkt->size = data_ptr - pkt->data;
     return 0;
 }
 
 static int mxf_decrypt_triplet(AVFormatContext *s, AVPacket *pkt, KLVPacket *klv)
 {
     static const uint8_t checkv[16] = {0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b};
     MXFContext *mxf = s->priv_data;
     ByteIOContext *pb = s->pb;

     int64_t end = url_ftell(pb) + klv->length;

     uint64_t size;
     uint64_t orig_size;
     uint64_t plaintext_size;
     uint8_t ivec[16];
     uint8_t tmpbuf[16];
     int index;
 
     if (!mxf->aesc && s->key && s->keylen == 16) {
         mxf->aesc = av_malloc(av_aes_size);
         if (!mxf->aesc)
             return -1;
         av_aes_init(mxf->aesc, s->key, 128, 1);
     }
     // crypto context
     url_fskip(pb, klv_decode_ber_length(pb));
     // plaintext offset
     klv_decode_ber_length(pb);
     plaintext_size = get_be64(pb);
     // source klv key
     klv_decode_ber_length(pb);
     get_buffer(pb, klv->key, 16);
     if (!IS_KLV_KEY(klv, mxf_essence_element_key))
         return -1;
     index = mxf_get_stream_index(s, klv);
     if (index < 0)
         return -1;
     // source size
     klv_decode_ber_length(pb);
     orig_size = get_be64(pb);
     if (orig_size < plaintext_size)
         return -1;
     // enc. code
     size = klv_decode_ber_length(pb);
     if (size < 32 || size - 32 < orig_size)
         return -1;
     get_buffer(pb, ivec, 16);
     get_buffer(pb, tmpbuf, 16);
     if (mxf->aesc)
         av_aes_crypt(mxf->aesc, tmpbuf, tmpbuf, 1, ivec, 1);
     if (memcmp(tmpbuf, checkv, 16))
         av_log(s, AV_LOG_ERROR, "probably incorrect decryption key\n");
     size -= 32;
     av_get_packet(pb, pkt, size);
     size -= plaintext_size;
     if (mxf->aesc)
         av_aes_crypt(mxf->aesc, &pkt->data[plaintext_size],
                      &pkt->data[plaintext_size], size >> 4, ivec, 1);
     pkt->size = orig_size;
     pkt->stream_index = index;
     url_fskip(pb, end - url_ftell(pb));
     return 0;
 }
 
 static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     KLVPacket klv;
 
     while (!url_feof(s->pb)) {
         if (klv_read_packet(&klv, s->pb) < 0)
             return -1;
         PRINT_KEY(s, "read packet", klv.key);

         dprintf(s, "size %lld offset %#llx\n", klv.length, klv.offset);

         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {
             int res = mxf_decrypt_triplet(s, pkt, &klv);
             if (res < 0) {
                 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");
                 return -1;
             }
             return 0;
         }
         if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
             int index = mxf_get_stream_index(s, &klv);
             if (index < 0) {

                 av_log(s, AV_LOG_ERROR, "error getting stream index %d\n", AV_RB32(klv.key+12));

                 goto skip;
             }
             if (s->streams[index]->discard == AVDISCARD_ALL)
                 goto skip;
             /* check for 8 channels AES3 element */
             if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {
                 if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) {
                     av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");
                     return -1;
                 }
             } else
                 av_get_packet(s->pb, pkt, klv.length);
             pkt->stream_index = index;
             pkt->pos = klv.offset;
             return 0;
         } else
         skip:
             url_fskip(s->pb, klv.length);
     }
     return AVERROR(EIO);
 }
 
 static int mxf_read_primer_pack(MXFContext *mxf)
 {
     ByteIOContext *pb = mxf->fc->pb;
     int item_num = get_be32(pb);
     int item_len = get_be32(pb);
 
     if (item_len != 18) {
         av_log(mxf->fc, AV_LOG_ERROR, "unsupported primer pack item length\n");
         return -1;
     }
     if (item_num > UINT_MAX / item_len)
         return -1;
     mxf->local_tags_count = item_num;
     mxf->local_tags = av_malloc(item_num*item_len);
     if (!mxf->local_tags)
         return -1;
     get_buffer(pb, mxf->local_tags, item_num*item_len);
     return 0;
 }
 
 static int mxf_add_metadata_set(MXFContext *mxf, void *metadata_set)
 {
     mxf->metadata_sets = av_realloc(mxf->metadata_sets, (mxf->metadata_sets_count + 1) * sizeof(*mxf->metadata_sets));
     if (!mxf->metadata_sets)
         return -1;
     mxf->metadata_sets[mxf->metadata_sets_count] = metadata_set;
     mxf->metadata_sets_count++;
     return 0;
 }
 
 static int mxf_read_cryptographic_context(MXFCryptoContext *cryptocontext, ByteIOContext *pb, int tag, int size, UID uid)
 {
     if (size != 16)
         return -1;
     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))
         get_buffer(pb, cryptocontext->source_container_ul, 16);
     return 0;
 }
 
 static int mxf_read_content_storage(MXFContext *mxf, ByteIOContext *pb, int tag)
 {
     switch (tag) {
     case 0x1901:
         mxf->packages_count = get_be32(pb);
         if (mxf->packages_count >= UINT_MAX / sizeof(UID))
             return -1;
         mxf->packages_refs = av_malloc(mxf->packages_count * sizeof(UID));
         if (!mxf->packages_refs)
             return -1;
         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
         get_buffer(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID));
         break;
     }
     return 0;
 }
 
 static int mxf_read_source_clip(MXFStructuralComponent *source_clip, ByteIOContext *pb, int tag)
 {
     switch(tag) {
     case 0x0202:
         source_clip->duration = get_be64(pb);
         break;
     case 0x1201:
         source_clip->start_position = get_be64(pb);
         break;
     case 0x1101:
         /* UMID, only get last 16 bytes */
         url_fskip(pb, 16);
         get_buffer(pb, source_clip->source_package_uid, 16);
         break;
     case 0x1102:
         source_clip->source_track_id = get_be32(pb);
         break;
     }
     return 0;
 }
 
 static int mxf_read_material_package(MXFPackage *package, ByteIOContext *pb, int tag)
 {
     switch(tag) {
     case 0x4403:
         package->tracks_count = get_be32(pb);
         if (package->tracks_count >= UINT_MAX / sizeof(UID))
             return -1;
         package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
         if (!package->tracks_refs)
             return -1;
         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
         get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
         break;
     }
     return 0;
 }
 
 static int mxf_read_track(MXFTrack *track, ByteIOContext *pb, int tag)
 {
     switch(tag) {
     case 0x4801:
         track->track_id = get_be32(pb);
         break;
     case 0x4804:
         get_buffer(pb, track->track_number, 4);
         break;
     case 0x4B01:
         track->edit_rate.den = get_be32(pb);
         track->edit_rate.num = get_be32(pb);
         break;
     case 0x4803:
         get_buffer(pb, track->sequence_ref, 16);
         break;
     }
     return 0;
 }
 
 static int mxf_read_sequence(MXFSequence *sequence, ByteIOContext *pb, int tag)
 {
     switch(tag) {
     case 0x0202:
         sequence->duration = get_be64(pb);
         break;
     case 0x0201:
         get_buffer(pb, sequence->data_definition_ul, 16);
         break;
     case 0x1001:
         sequence->structural_components_count = get_be32(pb);
         if (sequence->structural_components_count >= UINT_MAX / sizeof(UID))
             return -1;
         sequence->structural_components_refs = av_malloc(sequence->structural_components_count * sizeof(UID));
         if (!sequence->structural_components_refs)
             return -1;
         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
         get_buffer(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID));
         break;
     }
     return 0;
 }
 
 static int mxf_read_source_package(MXFPackage *package, ByteIOContext *pb, int tag)
 {
     switch(tag) {
     case 0x4403:
         package->tracks_count = get_be32(pb);
         if (package->tracks_count >= UINT_MAX / sizeof(UID))
             return -1;
         package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
         if (!package->tracks_refs)
             return -1;
         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
         get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
         break;
     case 0x4401:
         /* UMID, only get last 16 bytes */
         url_fskip(pb, 16);
         get_buffer(pb, package->package_uid, 16);
         break;
     case 0x4701:
         get_buffer(pb, package->descriptor_ref, 16);
         break;
     }
     return 0;
 }
 

 static int mxf_read_index_table_segment(MXFIndexTableSegment *segment, ByteIOContext *pb, int tag)
 {
     switch(tag) {
     case 0x3F05: dprintf(NULL, "EditUnitByteCount %d\n", get_be32(pb)); break;
     case 0x3F06: dprintf(NULL, "IndexSID %d\n", get_be32(pb)); break;
     case 0x3F07: dprintf(NULL, "BodySID %d\n", get_be32(pb)); break;
     case 0x3F0B: dprintf(NULL, "IndexEditRate %d/%d\n", get_be32(pb), get_be32(pb)); break;
     case 0x3F0C: dprintf(NULL, "IndexStartPosition %lld\n", get_be64(pb)); break;
     case 0x3F0D: dprintf(NULL, "IndexDuration %lld\n", get_be64(pb)); break;
     }
     return 0;
 }
 

 static void mxf_read_pixel_layout(ByteIOContext *pb, MXFDescriptor *descriptor)
 {
     int code;
 
     do {
         code = get_byte(pb);

         dprintf(NULL, "pixel layout: code %#x\n", code);

         switch (code) {
         case 0x52: /* R */
             descriptor->bits_per_sample += get_byte(pb);
             break;
         case 0x47: /* G */
             descriptor->bits_per_sample += get_byte(pb);
             break;
         case 0x42: /* B */
             descriptor->bits_per_sample += get_byte(pb);
             break;
         default:
             get_byte(pb);
         }
     } while (code != 0); /* SMPTE 377M E.2.46 */
 }
 
 static int mxf_read_generic_descriptor(MXFDescriptor *descriptor, ByteIOContext *pb, int tag, int size, UID uid)
 {
     switch(tag) {
     case 0x3F01:
         descriptor->sub_descriptors_count = get_be32(pb);
         if (descriptor->sub_descriptors_count >= UINT_MAX / sizeof(UID))
             return -1;
         descriptor->sub_descriptors_refs = av_malloc(descriptor->sub_descriptors_count * sizeof(UID));
         if (!descriptor->sub_descriptors_refs)
             return -1;
         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
         get_buffer(pb, (uint8_t *)descriptor->sub_descriptors_refs, descriptor->sub_descriptors_count * sizeof(UID));
         break;
     case 0x3004:
         get_buffer(pb, descriptor->essence_container_ul, 16);
         break;
     case 0x3006:
         descriptor->linked_track_id = get_be32(pb);
         break;
     case 0x3201: /* PictureEssenceCoding */
         get_buffer(pb, descriptor->essence_codec_ul, 16);
         break;
     case 0x3203:
         descriptor->width = get_be32(pb);
         break;
     case 0x3202:
         descriptor->height = get_be32(pb);
         break;
     case 0x320E:
         descriptor->aspect_ratio.num = get_be32(pb);
         descriptor->aspect_ratio.den = get_be32(pb);
         break;
     case 0x3D03:
         descriptor->sample_rate.num = get_be32(pb);
         descriptor->sample_rate.den = get_be32(pb);
         break;
     case 0x3D06: /* SoundEssenceCompression */
         get_buffer(pb, descriptor->essence_codec_ul, 16);
         break;
     case 0x3D07:
         descriptor->channels = get_be32(pb);
         break;
     case 0x3D01:
         descriptor->bits_per_sample = get_be32(pb);
         break;
     case 0x3401:
         mxf_read_pixel_layout(pb, descriptor);
         break;
     default:
         /* Private uid used by SONY C0023S01.mxf */
         if (IS_KLV_KEY(uid, mxf_sony_mpeg4_extradata)) {
             descriptor->extradata = av_malloc(size);
             if (!descriptor->extradata)
                 return -1;
             descriptor->extradata_size = size;
             get_buffer(pb, descriptor->extradata, size);
         }
         break;
     }
     return 0;
 }
 
 /*
  * Match an uid independently of the version byte and up to len common bytes
  * Returns: boolean
  */
 static int mxf_match_uid(const UID key, const UID uid, int len)
 {
     int i;
     for (i = 0; i < len; i++) {
         if (i != 7 && key[i] != uid[i])
             return 0;
     }
     return 1;
 }
 
 static const MXFCodecUL *mxf_get_codec_ul(const MXFCodecUL *uls, UID *uid)
 {

     while (uls->uid[0]) {

         if(mxf_match_uid(uls->uid, *uid, uls->matching_len))
             break;
         uls++;
     }
     return uls;
 }
 
 static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref, enum MXFMetadataSetType type)
 {
     int i;
 
     if (!strong_ref)
         return NULL;
     for (i = 0; i < mxf->metadata_sets_count; i++) {
         if (!memcmp(*strong_ref, mxf->metadata_sets[i]->uid, 16) &&
             (type == AnyType || mxf->metadata_sets[i]->type == type)) {
             return mxf->metadata_sets[i];
         }
     }
     return NULL;
 }
 

 static const MXFCodecUL mxf_essence_container_uls[] = {
     // video essence container uls
     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */
     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */
     // sound essence container uls
     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */
     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x40,0x01 }, 14,       CODEC_ID_MP2 }, /* MPEG-ES Frame wrapped, 0x40 ??? stream id */
     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 }, 14, CODEC_ID_PCM_S16LE }, /* D-10 Mapping 50Mbps PAL Extended Template */
     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },
 };
 

 static int mxf_parse_structural_metadata(MXFContext *mxf)
 {
     MXFPackage *material_package = NULL;
     MXFPackage *temp_package = NULL;
     int i, j, k;
 
     dprintf(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);
     /* TODO: handle multiple material packages (OP3x) */
     for (i = 0; i < mxf->packages_count; i++) {
         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);
         if (material_package) break;
     }
     if (!material_package) {
         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");
         return -1;
     }
 
     for (i = 0; i < material_package->tracks_count; i++) {
         MXFPackage *source_package = NULL;
         MXFTrack *material_track = NULL;
         MXFTrack *source_track = NULL;
         MXFTrack *temp_track = NULL;
         MXFDescriptor *descriptor = NULL;
         MXFStructuralComponent *component = NULL;
         UID *essence_container_ul = NULL;
         const MXFCodecUL *codec_ul = NULL;
         const MXFCodecUL *container_ul = NULL;
         AVStream *st;
 
         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {
             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");
             continue;
         }
 
         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {
             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");
             return -1;
         }
 
         /* TODO: handle multiple source clips */
         for (j = 0; j < material_track->sequence->structural_components_count; j++) {
             /* TODO: handle timecode component */
             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);
             if (!component)
                 continue;
 
             for (k = 0; k < mxf->packages_count; k++) {
                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);
                 if (!temp_package)
                     continue;
                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {
                     source_package = temp_package;
                     break;
                 }
             }
             if (!source_package) {
                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source package found\n", material_track->track_id);
                 break;
             }
             for (k = 0; k < source_package->tracks_count; k++) {
                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {
                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");
                     return -1;
                 }
                 if (temp_track->track_id == component->source_track_id) {
                     source_track = temp_track;
                     break;
                 }
             }
             if (!source_track) {
                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);
                 break;
             }
         }
         if (!source_track)
             continue;
 
         st = av_new_stream(mxf->fc, source_track->track_id);
         if (!st) {
             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");
             return -1;
         }
         st->priv_data = source_track;
         st->duration = component->duration;
         if (st->duration == -1)
             st->duration = AV_NOPTS_VALUE;
         st->start_time = component->start_position;
         av_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);
 
         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {
             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");
             return -1;
         }
 
         PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);

         codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);
         st->codec->codec_type = codec_ul->id;

 
         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);
         if (source_package->descriptor) {
             if (source_package->descriptor->type == MultipleDescriptor) {
                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {
                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);
 
                     if (!sub_descriptor) {
                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");
                         continue;
                     }
                     if (sub_descriptor->linked_track_id == source_track->track_id) {
                         descriptor = sub_descriptor;
                         break;
                     }
                 }
             } else if (source_package->descriptor->type == Descriptor)
                 descriptor = source_package->descriptor;
         }
         if (!descriptor) {
             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);
             continue;
         }
         PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);
         PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);
         essence_container_ul = &descriptor->essence_container_ul;
         /* HACK: replacing the original key with mxf_encrypted_essence_container
          * is not allowed according to s429-6, try to find correct information anyway */
         if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {
             av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");
             for (k = 0; k < mxf->metadata_sets_count; k++) {
                 MXFMetadataSet *metadata = mxf->metadata_sets[k];
                 if (metadata->type == CryptoContext) {
                     essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;
                     break;
                 }
             }
         }
         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */

         codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);

         st->codec->codec_id = codec_ul->id;
         if (descriptor->extradata) {
             st->codec->extradata = descriptor->extradata;
             st->codec->extradata_size = descriptor->extradata_size;
         }
         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {

             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

             if (st->codec->codec_id == CODEC_ID_NONE)
                 st->codec->codec_id = container_ul->id;
             st->codec->width = descriptor->width;
             st->codec->height = descriptor->height;

             st->codec->bits_per_coded_sample = descriptor->bits_per_sample; /* Uncompressed */

             st->need_parsing = AVSTREAM_PARSE_HEADERS;
         } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {

             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

             if (st->codec->codec_id == CODEC_ID_NONE)
                 st->codec->codec_id = container_ul->id;
             st->codec->channels = descriptor->channels;

             st->codec->bits_per_coded_sample = descriptor->bits_per_sample;

             st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;
             /* TODO: implement CODEC_ID_RAWAUDIO */
             if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {
                 if (descriptor->bits_per_sample == 24)
                     st->codec->codec_id = CODEC_ID_PCM_S24LE;
                 else if (descriptor->bits_per_sample == 32)
                     st->codec->codec_id = CODEC_ID_PCM_S32LE;
             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {
                 if (descriptor->bits_per_sample == 24)
                     st->codec->codec_id = CODEC_ID_PCM_S24BE;
                 else if (descriptor->bits_per_sample == 32)
                     st->codec->codec_id = CODEC_ID_PCM_S32BE;
             } else if (st->codec->codec_id == CODEC_ID_MP2) {
                 st->need_parsing = AVSTREAM_PARSE_FULL;
             }
         }
         if (st->codec->codec_type != CODEC_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {
             av_log(mxf->fc, AV_LOG_WARNING, "only frame wrapped mappings are correctly supported\n");
             st->need_parsing = AVSTREAM_PARSE_FULL;
         }
     }
     return 0;
 }
 
 static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {
     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },
     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },
     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },
     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },
     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },
     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },
     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },
     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Generic Sound */
     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */
     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */
     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* MPEG 2 Video */
     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */
     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */
     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */
     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */
     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },
 };
 
 static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, int (*read_child)(), int ctx_size, enum MXFMetadataSetType type)
 {
     ByteIOContext *pb = mxf->fc->pb;
     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;
     uint64_t klv_end = url_ftell(pb) + klv->length;
 
     if (!ctx)
         return -1;
     while (url_ftell(pb) + 4 < klv_end) {
         int tag = get_be16(pb);
         int size = get_be16(pb); /* KLV specified by 0x53 */
         uint64_t next = url_ftell(pb) + size;
         UID uid = {0};
 

         dprintf(mxf->fc, "local tag %#04x size %d\n", tag, size);

         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */

             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);

             continue;
         }
         if (tag > 0x7FFF) { /* dynamic tag */
             int i;
             for (i = 0; i < mxf->local_tags_count; i++) {
                 int local_tag = AV_RB16(mxf->local_tags+i*18);
                 if (local_tag == tag) {
                     memcpy(uid, mxf->local_tags+i*18+2, 16);

                     dprintf(mxf->fc, "local tag %#04x\n", local_tag);

                     PRINT_KEY(mxf->fc, "uid", uid);
                 }
             }
         }
         if (ctx_size && tag == 0x3C0A)
             get_buffer(pb, ctx->uid, 16);
         else if (read_child(ctx, pb, tag, size, uid) < 0)
             return -1;
 
         url_fseek(pb, next, SEEK_SET);
     }
     if (ctx_size) ctx->type = type;
     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;
 }
 
 static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 {
     MXFContext *mxf = s->priv_data;
     KLVPacket klv;
 
     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {
         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");
         return -1;
     }
     url_fseek(s->pb, -14, SEEK_CUR);
     mxf->fc = s;
     while (!url_feof(s->pb)) {
         const MXFMetadataReadTableEntry *metadata;
 
         if (klv_read_packet(&klv, s->pb) < 0)
             return -1;
         PRINT_KEY(s, "read header", klv.key);

         dprintf(s, "size %lld offset %#llx\n", klv.length, klv.offset);

         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||
             IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
             /* FIXME avoid seek */
             url_fseek(s->pb, klv.offset, SEEK_SET);
             break;
         }
 
         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {
             if (IS_KLV_KEY(klv.key, metadata->key)) {
                 int (*read)() = klv.key[5] == 0x53 ? mxf_read_local_tags : metadata->read;
                 if (read(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type) < 0) {
                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");
                     return -1;
                 }
                 break;
             }
         }
         if (!metadata->read)
             url_fskip(s->pb, klv.length);
     }
     return mxf_parse_structural_metadata(mxf);
 }
 
 static int mxf_read_close(AVFormatContext *s)
 {
     MXFContext *mxf = s->priv_data;
     int i;
 
     av_freep(&mxf->packages_refs);
     for (i = 0; i < mxf->metadata_sets_count; i++) {
         switch (mxf->metadata_sets[i]->type) {
         case MultipleDescriptor:
             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);
             break;
         case Sequence:
             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);
             break;
         case SourcePackage:
         case MaterialPackage:
             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);
             break;
         case Track:
             mxf->metadata_sets[i] = NULL; /* will be freed later */
             break;
         default:
             break;
         }
         av_freep(&mxf->metadata_sets[i]);
     }
     av_freep(&mxf->metadata_sets);
     av_freep(&mxf->aesc);
     av_freep(&mxf->local_tags);
     return 0;
 }
 
 static int mxf_probe(AVProbeData *p) {
     uint8_t *bufp = p->buf;
     uint8_t *end = p->buf + p->buf_size;
 
     if (p->buf_size < sizeof(mxf_header_partition_pack_key))
         return 0;
 
     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */
     end -= sizeof(mxf_header_partition_pack_key);
     for (; bufp < end; bufp++) {
         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))
             return AVPROBE_SCORE_MAX;
     }
     return 0;
 }
 
 /* rudimentary byte seek */
 /* XXX: use MXF Index */
 static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
 {
     AVStream *st = s->streams[stream_index];
     int64_t seconds;
 
     if (!s->bit_rate)
         return -1;
     if (sample_time < 0)
         sample_time = 0;
     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);
     url_fseek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);
     av_update_cur_dts(s, st, sample_time);
     return 0;
 }
 
 AVInputFormat mxf_demuxer = {
     "mxf",
     NULL_IF_CONFIG_SMALL("Material eXchange Format"),
     sizeof(MXFContext),
     mxf_probe,
     mxf_read_header,
     mxf_read_packet,
     mxf_read_close,
     mxf_read_seek,
 };