rename mxf.c to mxfdec.c
authorBaptiste Coudurier <baptiste.coudurier@gmail.com>
Thu, 7 Aug 2008 02:12:14 +0000 (02:12 +0000)
committerBaptiste Coudurier <baptiste.coudurier@gmail.com>
Thu, 7 Aug 2008 02:12:14 +0000 (02:12 +0000)
Originally committed as revision 14655 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/Makefile
libavformat/mxfdec.c [new file with mode: 0644]

index 8c62a366651a3b95881c8385bb92b27d452c0a35..c940ef161ac9fc13349b79861efa6da88f4d0abb 100644 (file)
@@ -108,7 +108,7 @@ OBJS-$(CONFIG_MPJPEG_MUXER)              += mpjpeg.o
 OBJS-$(CONFIG_MSNWC_TCP_DEMUXER)         += msnwc_tcp.o
 OBJS-$(CONFIG_MTV_DEMUXER)               += mtv.o
 OBJS-$(CONFIG_MVI_DEMUXER)               += mvi.o
 OBJS-$(CONFIG_MSNWC_TCP_DEMUXER)         += msnwc_tcp.o
 OBJS-$(CONFIG_MTV_DEMUXER)               += mtv.o
 OBJS-$(CONFIG_MVI_DEMUXER)               += mvi.o
-OBJS-$(CONFIG_MXF_DEMUXER)               += mxf.o
+OBJS-$(CONFIG_MXF_DEMUXER)               += mxfdec.o
 OBJS-$(CONFIG_NSV_DEMUXER)               += nsvdec.o
 OBJS-$(CONFIG_NULL_MUXER)                += raw.o
 OBJS-$(CONFIG_NUT_DEMUXER)               += nutdec.o nut.o riff.o
 OBJS-$(CONFIG_NSV_DEMUXER)               += nsvdec.o
 OBJS-$(CONFIG_NULL_MUXER)                += raw.o
 OBJS-$(CONFIG_NUT_DEMUXER)               += nutdec.o nut.o riff.o
diff --git a/libavformat/mxfdec.c b/libavformat/mxfdec.c
new file mode 100644 (file)
index 0000000..ccba07d
--- /dev/null
@@ -0,0 +1,1074 @@
+/*
+ * 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"
+
+typedef uint8_t UID[16];
+
+enum MXFMetadataSetType {
+    AnyType,
+    MaterialPackage,
+    SourcePackage,
+    SourceClip,
+    TimecodeComponent,
+    Sequence,
+    MultipleDescriptor,
+    Descriptor,
+    Track,
+    CryptoContext,
+};
+
+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;
+    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;
+
+typedef struct {
+    UID key;
+    offset_t offset;
+    uint64_t length;
+} KLVPacket;
+
+enum MXFWrappingScheme {
+    Frame,
+    Clip,
+};
+
+typedef struct {
+    UID uid;
+    unsigned matching_len;
+    enum CodecID id;
+} MXFCodecUL;
+
+typedef struct {
+    UID uid;
+    enum CodecType type;
+} MXFDataDefinitionUL;
+
+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)))
+
+#define PRINT_KEY(pc, s, x) dprintf(pc, "%s %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X\n", s, \
+                             (x)[0], (x)[1], (x)[2], (x)[3], (x)[4], (x)[5], (x)[6], (x)[7], (x)[8], (x)[9], (x)[10], (x)[11], (x)[12], (x)[13], (x)[14], (x)[15])
+
+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_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;
+    offset_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;
+#ifdef DEBUG
+        PRINT_KEY(s, "read packet", klv.key);
+#endif
+        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 %x\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 void mxf_read_pixel_layout(ByteIOContext *pb, MXFDescriptor *descriptor)
+{
+    int code;
+
+    do {
+        code = get_byte(pb);
+        dprintf(NULL, "pixel layout: code 0x%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;
+}
+
+/* SMPTE RP224 http://www.smpte-ra.org/mdd/index.html */
+static const MXFDataDefinitionUL mxf_data_definition_uls[] = {
+    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x01,0x00,0x00,0x00 }, CODEC_TYPE_VIDEO },
+    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x02,0x00,0x00,0x00 }, CODEC_TYPE_AUDIO },
+    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x05,0x01,0x03,0x02,0x02,0x02,0x02,0x00,0x00 }, CODEC_TYPE_AUDIO },
+    { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  CODEC_TYPE_DATA },
+};
+
+static const MXFCodecUL mxf_codec_uls[] = {
+    /* PictureEssenceCoding */
+    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, 14, CODEC_ID_MPEG2VIDEO }, /* MP@ML Long GoP */
+    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* D-10 50Mbps PAL */
+    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, 14, CODEC_ID_MPEG2VIDEO }, /* MP@HL Long GoP */
+    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x02,0x00 }, 14, CODEC_ID_MPEG2VIDEO }, /* 422P@HL I-Frame */
+    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x03 }, 14,      CODEC_ID_MPEG4 }, /* XDCAM proxy_pal030926.mxf */
+    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x01,0x02,0x00 }, 13,    CODEC_ID_DVVIDEO }, /* DV25 IEC PAL */
+    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 }, 14,   CODEC_ID_JPEG2000 }, /* JPEG2000 Codestream */
+    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x01,0x7F,0x00,0x00,0x00 }, 13,   CODEC_ID_RAWVIDEO }, /* Uncompressed */
+    /* SoundEssenceCompression */
+    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 }, 13,  CODEC_ID_PCM_S16LE }, /* Uncompressed */
+    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x7F,0x00,0x00,0x00 }, 13,  CODEC_ID_PCM_S16LE },
+    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x02,0x02,0x01,0x7E,0x00,0x00,0x00 }, 13,  CODEC_ID_PCM_S16BE }, /* From Omneon MXF file */
+    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x04,0x04,0x02,0x02,0x02,0x03,0x01,0x01,0x00 }, 15,   CODEC_ID_PCM_ALAW }, /* XDCAM Proxy C0023S01.mxf */
+    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x01,0x00 }, 15,        CODEC_ID_AC3 },
+    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x05,0x00 }, 15,        CODEC_ID_MP2 }, /* MP2 or MP3 */
+  //{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x1C,0x00 }, 15,    CODEC_ID_DOLBY_E }, /* Dolby-E */
+    { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       CODEC_ID_NONE },
+};
+
+static const MXFCodecUL mxf_picture_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 */
+    { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       CODEC_ID_NONE },
+};
+
+static const MXFCodecUL mxf_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 },
+};
+
+/*
+ * 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->id != CODEC_ID_NONE) {
+        if(mxf_match_uid(uls->uid, *uid, uls->matching_len))
+            break;
+        uls++;
+    }
+    return uls;
+}
+
+static enum CodecType mxf_get_codec_type(const MXFDataDefinitionUL *uls, UID *uid)
+{
+    while (uls->type != CODEC_TYPE_DATA) {
+        if(mxf_match_uid(uls->uid, *uid, 16))
+            break;
+        uls++;
+    }
+    return uls->type;
+}
+
+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 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;
+        }
+
+#ifdef DEBUG
+        PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);
+#endif
+        st->codec->codec_type = mxf_get_codec_type(mxf_data_definition_uls, &source_track->sequence->data_definition_ul);
+
+        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;
+        }
+#ifdef DEBUG
+        PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);
+        PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);
+#endif
+        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(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_picture_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_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_sound_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_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 },
+    { { 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};
+
+        if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */
+            av_log(mxf->fc, AV_LOG_ERROR, "local tag 0x%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 0x%04X\n", local_tag);
+#ifdef DEBUG
+                    PRINT_KEY(mxf->fc, "uid", uid);
+#endif
+                }
+            }
+        }
+        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;
+#ifdef DEBUG
+        PRINT_KEY(s, "read header", klv.key);
+#endif
+        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,
+};