FFmpeg: libavformat/mxfdec.c Source File

00001 /*
00002  * MXF demuxer.
00003  * Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 /*
00023  * References
00024  * SMPTE 336M KLV Data Encoding Protocol Using Key-Length-Value
00025  * SMPTE 377M MXF File Format Specifications
00026  * SMPTE 378M Operational Pattern 1a
00027  * SMPTE 379M MXF Generic Container
00028  * SMPTE 381M Mapping MPEG Streams into the MXF Generic Container
00029  * SMPTE 382M Mapping AES3 and Broadcast Wave Audio into the MXF Generic Container
00030  * SMPTE 383M Mapping DV-DIF Data to the MXF Generic Container
00031  *
00032  * Principle
00033  * Search for Track numbers which will identify essence element KLV packets.
00034  * Search for SourcePackage which define tracks which contains Track numbers.
00035  * Material Package contains tracks with reference to SourcePackage tracks.
00036  * Search for Descriptors (Picture, Sound) which contains codec info and parameters.
00037  * Assign Descriptors to correct Tracks.
00038  *
00039  * Metadata reading functions read Local Tags, get InstanceUID(0x3C0A) then add MetaDataSet to MXFContext.
00040  * Metadata parsing resolves Strong References to objects.
00041  *
00042  * Simple demuxer, only OP1A supported and some files might not work at all.
00043  * Only tracks with associated descriptors will be decoded. "Highly Desirable" SMPTE 377M D.1
00044  */
00045 
00046 //#define DEBUG
00047 
00048 #include "libavutil/aes.h"
00049 #include "libavutil/mathematics.h"
00050 #include "libavcodec/bytestream.h"
00051 #include "avformat.h"
00052 #include "internal.h"
00053 #include "mxf.h"
00054 
00055 typedef enum {
00056     Header,
00057     BodyPartition,
00058     Footer
00059 } MXFPartitionType;
00060 
00061 typedef enum {
00062     OP1a,
00063     OP1b,
00064     OP1c,
00065     OP2a,
00066     OP2b,
00067     OP2c,
00068     OP3a,
00069     OP3b,
00070     OP3c,
00071     OPAtom,
00072     OPSONYOpt,  /* FATE sample, violates the spec in places */
00073 } MXFOP;
00074 
00075 typedef struct {
00076     int closed;
00077     int complete;
00078     MXFPartitionType type;
00079     uint64_t previous_partition;
00080     int index_sid;
00081     int body_sid;
00082     int64_t this_partition;
00083     int64_t essence_offset;         /* absolute offset of essence */
00084     int64_t essence_length;
00085     int32_t kag_size;
00086     int64_t header_byte_count;
00087     int64_t index_byte_count;
00088     int pack_length;
00089 } MXFPartition;
00090 
00091 typedef struct {
00092     UID uid;
00093     enum MXFMetadataSetType type;
00094     UID source_container_ul;
00095 } MXFCryptoContext;
00096 
00097 typedef struct {
00098     UID uid;
00099     enum MXFMetadataSetType type;
00100     UID source_package_uid;
00101     UID data_definition_ul;
00102     int64_t duration;
00103     int64_t start_position;
00104     int source_track_id;
00105 } MXFStructuralComponent;
00106 
00107 typedef struct {
00108     UID uid;
00109     enum MXFMetadataSetType type;
00110     UID data_definition_ul;
00111     UID *structural_components_refs;
00112     int structural_components_count;
00113     int64_t duration;
00114 } MXFSequence;
00115 
00116 typedef struct {
00117     UID uid;
00118     enum MXFMetadataSetType type;
00119     MXFSequence *sequence; /* mandatory, and only one */
00120     UID sequence_ref;
00121     int track_id;
00122     uint8_t track_number[4];
00123     AVRational edit_rate;
00124 } MXFTrack;
00125 
00126 typedef struct {
00127     UID uid;
00128     enum MXFMetadataSetType type;
00129     UID essence_container_ul;
00130     UID essence_codec_ul;
00131     AVRational sample_rate;
00132     AVRational aspect_ratio;
00133     int width;
00134     int height;
00135     int channels;
00136     int bits_per_sample;
00137     UID *sub_descriptors_refs;
00138     int sub_descriptors_count;
00139     int linked_track_id;
00140     uint8_t *extradata;
00141     int extradata_size;
00142     enum PixelFormat pix_fmt;
00143 } MXFDescriptor;
00144 
00145 typedef struct {
00146     UID uid;
00147     enum MXFMetadataSetType type;
00148     int edit_unit_byte_count;
00149     int index_sid;
00150     int body_sid;
00151     int slice_count;
00152     AVRational index_edit_rate;
00153     uint64_t index_start_position;
00154     uint64_t index_duration;
00155     int *slice;
00156     int *element_delta;
00157     int nb_delta_entries;
00158     int8_t *temporal_offset_entries;
00159     int *flag_entries;
00160     uint64_t *stream_offset_entries;
00161     uint32_t **slice_offset_entries;
00162     int nb_index_entries;
00163 } MXFIndexTableSegment;
00164 
00165 typedef struct {
00166     UID uid;
00167     enum MXFMetadataSetType type;
00168     UID package_uid;
00169     UID *tracks_refs;
00170     int tracks_count;
00171     MXFDescriptor *descriptor; /* only one */
00172     UID descriptor_ref;
00173 } MXFPackage;
00174 
00175 typedef struct {
00176     UID uid;
00177     enum MXFMetadataSetType type;
00178 } MXFMetadataSet;
00179 
00180 typedef struct {
00181     MXFPartition *partitions;
00182     unsigned partitions_count;
00183     MXFOP op;
00184     UID *packages_refs;
00185     int packages_count;
00186     MXFMetadataSet **metadata_sets;
00187     int metadata_sets_count;
00188     AVFormatContext *fc;
00189     struct AVAES *aesc;
00190     uint8_t *local_tags;
00191     int local_tags_count;
00192     uint64_t footer_partition;
00193     KLVPacket current_klv_data;
00194     int current_klv_index;
00195     int run_in;
00196     MXFPartition *current_partition;
00197     int parsing_backward;
00198     int64_t last_forward_tell;
00199     int last_forward_partition;
00200     int current_edit_unit;
00201     int current_stream;
00202     int d10;
00203     int broken_index;
00204 } MXFContext;
00205 
00206 enum MXFWrappingScheme {
00207     Frame,
00208     Clip,
00209 };
00210 
00211 /* NOTE: klv_offset is not set (-1) for local keys */
00212 typedef int MXFMetadataReadFunc(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset);
00213 
00214 typedef struct {
00215     const UID key;
00216     MXFMetadataReadFunc *read;
00217     int ctx_size;
00218     enum MXFMetadataSetType type;
00219 } MXFMetadataReadTableEntry;
00220 
00221 /* partial keys to match */
00222 static const uint8_t mxf_header_partition_pack_key[]       = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02 };
00223 static const uint8_t mxf_essence_element_key[]             = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01 };
00224 static const uint8_t mxf_system_item_key[]                 = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x03,0x01,0x04 };
00225 static const uint8_t mxf_klv_key[]                         = { 0x06,0x0e,0x2b,0x34 };
00226 /* complete keys to match */
00227 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 };
00228 static const uint8_t mxf_encrypted_triplet_key[]           = { 0x06,0x0e,0x2b,0x34,0x02,0x04,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x7e,0x01,0x00 };
00229 static const uint8_t mxf_encrypted_essence_container[]     = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x0b,0x01,0x00 };
00230 static const uint8_t mxf_sony_mpeg4_extradata[]            = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0e,0x06,0x06,0x02,0x02,0x01,0x00,0x00 };
00231 
00232 #define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y)))
00233 
00234 static int64_t klv_decode_ber_length(AVIOContext *pb)
00235 {
00236     uint64_t size = avio_r8(pb);
00237     if (size & 0x80) { /* long form */
00238         int bytes_num = size & 0x7f;
00239         /* SMPTE 379M 5.3.4 guarantee that bytes_num must not exceed 8 bytes */
00240         if (bytes_num > 8)
00241             return -1;
00242         size = 0;
00243         while (bytes_num--)
00244             size = size << 8 | avio_r8(pb);
00245     }
00246     return size;
00247 }
00248 
00249 static int mxf_read_sync(AVIOContext *pb, const uint8_t *key, unsigned size)
00250 {
00251     int i, b;
00252     for (i = 0; i < size && !url_feof(pb); i++) {
00253         b = avio_r8(pb);
00254         if (b == key[0])
00255             i = 0;
00256         else if (b != key[i])
00257             i = -1;
00258     }
00259     return i == size;
00260 }
00261 
00262 static int klv_read_packet(KLVPacket *klv, AVIOContext *pb)
00263 {
00264     if (!mxf_read_sync(pb, mxf_klv_key, 4))
00265         return -1;
00266     klv->offset = avio_tell(pb) - 4;
00267     memcpy(klv->key, mxf_klv_key, 4);
00268     avio_read(pb, klv->key + 4, 12);
00269     klv->length = klv_decode_ber_length(pb);
00270     return klv->length == -1 ? -1 : 0;
00271 }
00272 
00273 static int mxf_get_stream_index(AVFormatContext *s, KLVPacket *klv)
00274 {
00275     int i;
00276 
00277     for (i = 0; i < s->nb_streams; i++) {
00278         MXFTrack *track = s->streams[i]->priv_data;
00279         /* SMPTE 379M 7.3 */
00280         if (!memcmp(klv->key + sizeof(mxf_essence_element_key), track->track_number, sizeof(track->track_number)))
00281             return i;
00282     }
00283     /* return 0 if only one stream, for OP Atom files with 0 as track number */
00284     return s->nb_streams == 1 ? 0 : -1;
00285 }
00286 
00287 /* XXX: use AVBitStreamFilter */
00288 static int mxf_get_d10_aes3_packet(AVIOContext *pb, AVStream *st, AVPacket *pkt, int64_t length)
00289 {
00290     const uint8_t *buf_ptr, *end_ptr;
00291     uint8_t *data_ptr;
00292     int i;
00293 
00294     if (length > 61444) /* worst case PAL 1920 samples 8 channels */
00295         return -1;
00296     length = av_get_packet(pb, pkt, length);
00297     if (length < 0)
00298         return length;
00299     data_ptr = pkt->data;
00300     end_ptr = pkt->data + length;
00301     buf_ptr = pkt->data + 4; /* skip SMPTE 331M header */
00302     for (; buf_ptr + st->codec->channels*4 < end_ptr; ) {
00303         for (i = 0; i < st->codec->channels; i++) {
00304             uint32_t sample = bytestream_get_le32(&buf_ptr);
00305             if (st->codec->bits_per_coded_sample == 24)
00306                 bytestream_put_le24(&data_ptr, (sample >> 4) & 0xffffff);
00307             else
00308                 bytestream_put_le16(&data_ptr, (sample >> 12) & 0xffff);
00309         }
00310         buf_ptr += 32 - st->codec->channels*4; // always 8 channels stored SMPTE 331M
00311     }
00312     av_shrink_packet(pkt, data_ptr - pkt->data);
00313     return 0;
00314 }
00315 
00316 static int mxf_decrypt_triplet(AVFormatContext *s, AVPacket *pkt, KLVPacket *klv)
00317 {
00318     static const uint8_t checkv[16] = {0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b};
00319     MXFContext *mxf = s->priv_data;
00320     AVIOContext *pb = s->pb;
00321     int64_t end = avio_tell(pb) + klv->length;
00322     int64_t size;
00323     uint64_t orig_size;
00324     uint64_t plaintext_size;
00325     uint8_t ivec[16];
00326     uint8_t tmpbuf[16];
00327     int index;
00328 
00329     if (!mxf->aesc && s->key && s->keylen == 16) {
00330         mxf->aesc = av_malloc(av_aes_size);
00331         if (!mxf->aesc)
00332             return -1;
00333         av_aes_init(mxf->aesc, s->key, 128, 1);
00334     }
00335     // crypto context
00336     avio_skip(pb, klv_decode_ber_length(pb));
00337     // plaintext offset
00338     klv_decode_ber_length(pb);
00339     plaintext_size = avio_rb64(pb);
00340     // source klv key
00341     klv_decode_ber_length(pb);
00342     avio_read(pb, klv->key, 16);
00343     if (!IS_KLV_KEY(klv, mxf_essence_element_key))
00344         return -1;
00345     index = mxf_get_stream_index(s, klv);
00346     if (index < 0)
00347         return -1;
00348     // source size
00349     klv_decode_ber_length(pb);
00350     orig_size = avio_rb64(pb);
00351     if (orig_size < plaintext_size)
00352         return -1;
00353     // enc. code
00354     size = klv_decode_ber_length(pb);
00355     if (size < 32 || size - 32 < orig_size)
00356         return -1;
00357     avio_read(pb, ivec, 16);
00358     avio_read(pb, tmpbuf, 16);
00359     if (mxf->aesc)
00360         av_aes_crypt(mxf->aesc, tmpbuf, tmpbuf, 1, ivec, 1);
00361     if (memcmp(tmpbuf, checkv, 16))
00362         av_log(s, AV_LOG_ERROR, "probably incorrect decryption key\n");
00363     size -= 32;
00364     size = av_get_packet(pb, pkt, size);
00365     if (size < 0)
00366         return size;
00367     else if (size < plaintext_size)
00368         return AVERROR_INVALIDDATA;
00369     size -= plaintext_size;
00370     if (mxf->aesc)
00371         av_aes_crypt(mxf->aesc, &pkt->data[plaintext_size],
00372                      &pkt->data[plaintext_size], size >> 4, ivec, 1);
00373     av_shrink_packet(pkt, orig_size);
00374     pkt->stream_index = index;
00375     avio_skip(pb, end - avio_tell(pb));
00376     return 0;
00377 }
00378 
00379 static int mxf_read_packet_old(AVFormatContext *s, AVPacket *pkt)
00380 {
00381     KLVPacket klv;
00382 
00383     while (!url_feof(s->pb)) {
00384         if (klv_read_packet(&klv, s->pb) < 0)
00385             return -1;
00386         PRINT_KEY(s, "read packet", klv.key);
00387         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);
00388         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {
00389             int res = mxf_decrypt_triplet(s, pkt, &klv);
00390             if (res < 0) {
00391                 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");
00392                 return -1;
00393             }
00394             return 0;
00395         }
00396         if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
00397             int index = mxf_get_stream_index(s, &klv);
00398             if (index < 0) {
00399                 av_log(s, AV_LOG_ERROR, "error getting stream index %d\n", AV_RB32(klv.key+12));
00400                 goto skip;
00401             }
00402             if (s->streams[index]->discard == AVDISCARD_ALL)
00403                 goto skip;
00404             /* check for 8 channels AES3 element */
00405             if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {
00406                 if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) {
00407                     av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");
00408                     return -1;
00409                 }
00410             } else {
00411                 int ret = av_get_packet(s->pb, pkt, klv.length);
00412                 if (ret < 0)
00413                     return ret;
00414             }
00415             pkt->stream_index = index;
00416             pkt->pos = klv.offset;
00417             return 0;
00418         } else
00419         skip:
00420             avio_skip(s->pb, klv.length);
00421     }
00422     return AVERROR_EOF;
00423 }
00424 
00425 static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)
00426 {
00427     MXFContext *mxf = s->priv_data;
00428     AVIndexEntry *e;
00429     int ret;
00430     int64_t ret64;
00431     KLVPacket klv;
00432     AVStream *st;
00433 
00434     /* TODO: better logic for this?
00435      * only files that lack all index segments prior to the essence need this */
00436     if (mxf->op != OPAtom)
00437         return mxf_read_packet_old(s, pkt);
00438 
00439     if (mxf->current_stream >= s->nb_streams) {
00440         mxf->current_edit_unit++;
00441         mxf->current_stream = 0;
00442     }
00443 
00444     st = s->streams[mxf->current_stream];
00445 
00446     if (mxf->current_edit_unit >= st->nb_index_entries)
00447         return AVERROR_EOF;
00448 
00449     e = &st->index_entries[mxf->current_edit_unit];
00450 
00451     if ((ret64 = avio_seek(s->pb, e->pos, SEEK_SET)) < 0)
00452         return ret64;
00453 
00454     if (mxf->op == OPAtom) {
00455         /* OPAtom - no KL, just essence */
00456         if ((ret = av_get_packet(s->pb, pkt, e->size)) != e->size)
00457             return ret < 0 ? ret : AVERROR_EOF;
00458     } else {
00459         /* read KL, read L bytes of essence */
00460         if ((ret = klv_read_packet(&klv, s->pb)) < 0)
00461             return ret;
00462 
00463         /* untested, but looks OK */
00464         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {
00465             int res = mxf_decrypt_triplet(s, pkt, &klv);
00466             if (res < 0) {
00467                 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");
00468                 return -1;
00469             }
00470             return 0;
00471         }
00472 
00473         if ((ret = av_get_packet(s->pb, pkt, klv.length)) != klv.length)
00474             return ret < 0 ? ret : AVERROR_EOF;
00475 
00476         pkt->pos = e->pos;
00477     }
00478 
00479     pkt->stream_index = mxf->current_stream++;
00480 
00481     return 0;
00482 }
00483 
00484 static int mxf_read_primer_pack(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
00485 {
00486     MXFContext *mxf = arg;
00487     int item_num = avio_rb32(pb);
00488     int item_len = avio_rb32(pb);
00489 
00490     if (item_len != 18) {
00491         av_log(mxf->fc, AV_LOG_ERROR, "unsupported primer pack item length\n");
00492         return -1;
00493     }
00494     if (item_num > UINT_MAX / item_len)
00495         return -1;
00496     mxf->local_tags_count = item_num;
00497     mxf->local_tags = av_malloc(item_num*item_len);
00498     if (!mxf->local_tags)
00499         return -1;
00500     avio_read(pb, mxf->local_tags, item_num*item_len);
00501     return 0;
00502 }
00503 
00504 static int mxf_read_partition_pack(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
00505 {
00506     MXFContext *mxf = arg;
00507     MXFPartition *partition;
00508     UID op;
00509     uint64_t footer_partition;
00510 
00511     if (mxf->partitions_count+1 >= UINT_MAX / sizeof(*mxf->partitions))
00512         return AVERROR(ENOMEM);
00513 
00514     mxf->partitions = av_realloc(mxf->partitions, (mxf->partitions_count + 1) * sizeof(*mxf->partitions));
00515     if (!mxf->partitions)
00516         return AVERROR(ENOMEM);
00517 
00518     if (mxf->parsing_backward) {
00519         /* insert the new partition pack in the middle
00520          * this makes the entries in mxf->partitions sorted by offset */
00521         memmove(&mxf->partitions[mxf->last_forward_partition+1],
00522                 &mxf->partitions[mxf->last_forward_partition],
00523                 (mxf->partitions_count - mxf->last_forward_partition)*sizeof(*mxf->partitions));
00524         partition = mxf->current_partition = &mxf->partitions[mxf->last_forward_partition];
00525     } else {
00526         mxf->last_forward_partition++;
00527         partition = mxf->current_partition = &mxf->partitions[mxf->partitions_count];
00528     }
00529 
00530     memset(partition, 0, sizeof(*partition));
00531     mxf->partitions_count++;
00532     partition->pack_length = avio_tell(pb) - klv_offset + size;
00533 
00534     switch(uid[13]) {
00535     case 2:
00536         partition->type = Header;
00537         break;
00538     case 3:
00539         partition->type = BodyPartition;
00540         break;
00541     case 4:
00542         partition->type = Footer;
00543         break;
00544     default:
00545         av_log(mxf->fc, AV_LOG_ERROR, "unknown partition type %i\n", uid[13]);
00546         return AVERROR_INVALIDDATA;
00547     }
00548 
00549     /* consider both footers to be closed (there is only Footer and CompleteFooter) */
00550     partition->closed = partition->type == Footer || !(uid[14] & 1);
00551     partition->complete = uid[14] > 2;
00552     avio_skip(pb, 4);
00553     partition->kag_size = avio_rb32(pb);
00554     partition->this_partition = avio_rb64(pb);
00555     partition->previous_partition = avio_rb64(pb);
00556     footer_partition = avio_rb64(pb);
00557     partition->header_byte_count = avio_rb64(pb);
00558     partition->index_byte_count = avio_rb64(pb);
00559     partition->index_sid = avio_rb32(pb);
00560     avio_skip(pb, 8);
00561     partition->body_sid = avio_rb32(pb);
00562     avio_read(pb, op, sizeof(UID));
00563 
00564     /* some files don'thave FooterPartition set in every partition */
00565     if (footer_partition) {
00566         if (mxf->footer_partition && mxf->footer_partition != footer_partition) {
00567             av_log(mxf->fc, AV_LOG_ERROR, "inconsistent FooterPartition value: %li != %li\n",
00568                    mxf->footer_partition, footer_partition);
00569         } else {
00570             mxf->footer_partition = footer_partition;
00571         }
00572     }
00573 
00574     av_dlog(mxf->fc, "PartitionPack: ThisPartition = 0x%lx, PreviousPartition = 0x%lx, "
00575             "FooterPartition = 0x%lx, IndexSID = %i, BodySID = %i\n",
00576             partition->this_partition,
00577             partition->previous_partition, footer_partition,
00578             partition->index_sid, partition->body_sid);
00579 
00580     /* sanity check PreviousPartition if set */
00581     if (partition->previous_partition &&
00582         mxf->run_in + partition->previous_partition >= klv_offset) {
00583         av_log(mxf->fc, AV_LOG_ERROR, "PreviousPartition points to this partition or forward\n");
00584         return AVERROR_INVALIDDATA;
00585     }
00586 
00587     if      (op[12] == 1 && op[13] == 1) mxf->op = OP1a;
00588     else if (op[12] == 1 && op[13] == 2) mxf->op = OP1b;
00589     else if (op[12] == 1 && op[13] == 3) mxf->op = OP1c;
00590     else if (op[12] == 2 && op[13] == 1) mxf->op = OP2a;
00591     else if (op[12] == 2 && op[13] == 2) mxf->op = OP2b;
00592     else if (op[12] == 2 && op[13] == 3) mxf->op = OP2c;
00593     else if (op[12] == 3 && op[13] == 1) mxf->op = OP3a;
00594     else if (op[12] == 3 && op[13] == 2) mxf->op = OP3b;
00595     else if (op[12] == 3 && op[13] == 3) mxf->op = OP3c;
00596     else if (op[12] == 0x10)             mxf->op = OPAtom;
00597     else if (op[12] == 64&& op[13] == 1) mxf->op = OPSONYOpt;
00598     else {
00599         av_log(mxf->fc, AV_LOG_ERROR, "unknown operational pattern: %02xh %02xh - guessing OP1a\n", op[12], op[13]);
00600         mxf->op = OP1a;
00601     }
00602 
00603     if (partition->kag_size <= 0 || partition->kag_size > (1 << 20)) {
00604         av_log(mxf->fc, AV_LOG_WARNING, "invalid KAGSize %i - guessing ", partition->kag_size);
00605 
00606         if (mxf->op == OPSONYOpt)
00607             partition->kag_size = 512;
00608         else
00609             partition->kag_size = 1;
00610 
00611         av_log(mxf->fc, AV_LOG_WARNING, "%i\n", partition->kag_size);
00612     }
00613 
00614     return 0;
00615 }
00616 
00617 static int mxf_add_metadata_set(MXFContext *mxf, void *metadata_set)
00618 {
00619     if (mxf->metadata_sets_count+1 >= UINT_MAX / sizeof(*mxf->metadata_sets))
00620         return AVERROR(ENOMEM);
00621     mxf->metadata_sets = av_realloc(mxf->metadata_sets, (mxf->metadata_sets_count + 1) * sizeof(*mxf->metadata_sets));
00622     if (!mxf->metadata_sets)
00623         return -1;
00624     mxf->metadata_sets[mxf->metadata_sets_count] = metadata_set;
00625     mxf->metadata_sets_count++;
00626     return 0;
00627 }
00628 
00629 static int mxf_read_cryptographic_context(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
00630 {
00631     MXFCryptoContext *cryptocontext = arg;
00632     if (size != 16)
00633         return -1;
00634     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))
00635         avio_read(pb, cryptocontext->source_container_ul, 16);
00636     return 0;
00637 }
00638 
00639 static int mxf_read_content_storage(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
00640 {
00641     MXFContext *mxf = arg;
00642     switch (tag) {
00643     case 0x1901:
00644         mxf->packages_count = avio_rb32(pb);
00645         if (mxf->packages_count >= UINT_MAX / sizeof(UID))
00646             return -1;
00647         mxf->packages_refs = av_malloc(mxf->packages_count * sizeof(UID));
00648         if (!mxf->packages_refs)
00649             return -1;
00650         avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */
00651         avio_read(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID));
00652         break;
00653     }
00654     return 0;
00655 }
00656 
00657 static int mxf_read_source_clip(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
00658 {
00659     MXFStructuralComponent *source_clip = arg;
00660     switch(tag) {
00661     case 0x0202:
00662         source_clip->duration = avio_rb64(pb);
00663         break;
00664     case 0x1201:
00665         source_clip->start_position = avio_rb64(pb);
00666         break;
00667     case 0x1101:
00668         /* UMID, only get last 16 bytes */
00669         avio_skip(pb, 16);
00670         avio_read(pb, source_clip->source_package_uid, 16);
00671         break;
00672     case 0x1102:
00673         source_clip->source_track_id = avio_rb32(pb);
00674         break;
00675     }
00676     return 0;
00677 }
00678 
00679 static int mxf_read_material_package(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
00680 {
00681     MXFPackage *package = arg;
00682     switch(tag) {
00683     case 0x4403:
00684         package->tracks_count = avio_rb32(pb);
00685         if (package->tracks_count >= UINT_MAX / sizeof(UID))
00686             return -1;
00687         package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
00688         if (!package->tracks_refs)
00689             return -1;
00690         avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */
00691         avio_read(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
00692         break;
00693     }
00694     return 0;
00695 }
00696 
00697 static int mxf_read_track(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
00698 {
00699     MXFTrack *track = arg;
00700     switch(tag) {
00701     case 0x4801:
00702         track->track_id = avio_rb32(pb);
00703         break;
00704     case 0x4804:
00705         avio_read(pb, track->track_number, 4);
00706         break;
00707     case 0x4B01:
00708         track->edit_rate.den = avio_rb32(pb);
00709         track->edit_rate.num = avio_rb32(pb);
00710         break;
00711     case 0x4803:
00712         avio_read(pb, track->sequence_ref, 16);
00713         break;
00714     }
00715     return 0;
00716 }
00717 
00718 static int mxf_read_sequence(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
00719 {
00720     MXFSequence *sequence = arg;
00721     switch(tag) {
00722     case 0x0202:
00723         sequence->duration = avio_rb64(pb);
00724         break;
00725     case 0x0201:
00726         avio_read(pb, sequence->data_definition_ul, 16);
00727         break;
00728     case 0x1001:
00729         sequence->structural_components_count = avio_rb32(pb);
00730         if (sequence->structural_components_count >= UINT_MAX / sizeof(UID))
00731             return -1;
00732         sequence->structural_components_refs = av_malloc(sequence->structural_components_count * sizeof(UID));
00733         if (!sequence->structural_components_refs)
00734             return -1;
00735         avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */
00736         avio_read(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID));
00737         break;
00738     }
00739     return 0;
00740 }
00741 
00742 static int mxf_read_source_package(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
00743 {
00744     MXFPackage *package = arg;
00745     switch(tag) {
00746     case 0x4403:
00747         package->tracks_count = avio_rb32(pb);
00748         if (package->tracks_count >= UINT_MAX / sizeof(UID))
00749             return -1;
00750         package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
00751         if (!package->tracks_refs)
00752             return -1;
00753         avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */
00754         avio_read(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
00755         break;
00756     case 0x4401:
00757         /* UMID, only get last 16 bytes */
00758         avio_skip(pb, 16);
00759         avio_read(pb, package->package_uid, 16);
00760         break;
00761     case 0x4701:
00762         avio_read(pb, package->descriptor_ref, 16);
00763         break;
00764     }
00765     return 0;
00766 }
00767 
00768 static int mxf_read_delta_entry_array(AVIOContext *pb, MXFIndexTableSegment *segment)
00769 {
00770     int i, length;
00771 
00772     segment->nb_delta_entries = avio_rb32(pb);
00773     length = avio_rb32(pb);
00774 
00775     if (!(segment->slice         = av_calloc(segment->nb_delta_entries, sizeof(*segment->slice))) ||
00776         !(segment->element_delta = av_calloc(segment->nb_delta_entries, sizeof(*segment->element_delta))))
00777         return AVERROR(ENOMEM);
00778 
00779     for (i = 0; i < segment->nb_delta_entries; i++) {
00780         avio_r8(pb);    /* PosTableIndex */
00781         segment->slice[i] = avio_r8(pb);
00782         segment->element_delta[i] = avio_rb32(pb);
00783     }
00784     return 0;
00785 }
00786 
00787 static int mxf_read_index_entry_array(AVIOContext *pb, MXFIndexTableSegment *segment)
00788 {
00789     int i, j, length;
00790 
00791     segment->nb_index_entries = avio_rb32(pb);
00792     length = avio_rb32(pb);
00793 
00794     if (!(segment->temporal_offset_entries=av_calloc(segment->nb_index_entries, sizeof(*segment->temporal_offset_entries))) ||
00795         !(segment->flag_entries          = av_calloc(segment->nb_index_entries, sizeof(*segment->flag_entries))) ||
00796         !(segment->stream_offset_entries = av_calloc(segment->nb_index_entries, sizeof(*segment->stream_offset_entries))))
00797         return AVERROR(ENOMEM);
00798 
00799     if (segment->slice_count &&
00800         !(segment->slice_offset_entries  = av_calloc(segment->nb_index_entries, sizeof(*segment->slice_offset_entries))))
00801         return AVERROR(ENOMEM);
00802 
00803     for (i = 0; i < segment->nb_index_entries; i++) {
00804         segment->temporal_offset_entries[i] = avio_r8(pb);
00805         avio_r8(pb);                                        /* KeyFrameOffset */
00806         segment->flag_entries[i] = avio_r8(pb);
00807         segment->stream_offset_entries[i] = avio_rb64(pb);
00808         if (segment->slice_count) {
00809             if (!(segment->slice_offset_entries[i] = av_calloc(segment->slice_count, sizeof(**segment->slice_offset_entries))))
00810                 return AVERROR(ENOMEM);
00811 
00812             for (j = 0; j < segment->slice_count; j++)
00813                 segment->slice_offset_entries[i][j] = avio_rb32(pb);
00814         }
00815 
00816         avio_skip(pb, length - 11 - 4 * segment->slice_count);
00817     }
00818     return 0;
00819 }
00820 
00821 static int mxf_read_index_table_segment(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
00822 {
00823     MXFIndexTableSegment *segment = arg;
00824     switch(tag) {
00825     case 0x3F05:
00826         segment->edit_unit_byte_count = avio_rb32(pb);
00827         av_dlog(NULL, "EditUnitByteCount %d\n", segment->edit_unit_byte_count);
00828         break;
00829     case 0x3F06:
00830         segment->index_sid = avio_rb32(pb);
00831         av_dlog(NULL, "IndexSID %d\n", segment->index_sid);
00832         break;
00833     case 0x3F07:
00834         segment->body_sid = avio_rb32(pb);
00835         av_dlog(NULL, "BodySID %d\n", segment->body_sid);
00836         break;
00837     case 0x3F08:
00838         segment->slice_count = avio_r8(pb);
00839         av_dlog(NULL, "SliceCount %d\n", segment->slice_count);
00840         break;
00841     case 0x3F09:
00842         av_dlog(NULL, "DeltaEntryArray found\n");
00843         return mxf_read_delta_entry_array(pb, segment);
00844     case 0x3F0A:
00845         av_dlog(NULL, "IndexEntryArray found\n");
00846         return mxf_read_index_entry_array(pb, segment);
00847     case 0x3F0B:
00848         segment->index_edit_rate.num = avio_rb32(pb);
00849         segment->index_edit_rate.den = avio_rb32(pb);
00850         av_dlog(NULL, "IndexEditRate %d/%d\n", segment->index_edit_rate.num,
00851                 segment->index_edit_rate.den);
00852         break;
00853     case 0x3F0C:
00854         segment->index_start_position = avio_rb64(pb);
00855         av_dlog(NULL, "IndexStartPosition %"PRId64"\n", segment->index_start_position);
00856         break;
00857     case 0x3F0D:
00858         segment->index_duration = avio_rb64(pb);
00859         av_dlog(NULL, "IndexDuration %"PRId64"\n", segment->index_duration);
00860         break;
00861     }
00862     return 0;
00863 }
00864 
00865 static void mxf_read_pixel_layout(AVIOContext *pb, MXFDescriptor *descriptor)
00866 {
00867     int code, value, ofs = 0;
00868     char layout[16] = {0};
00869 
00870     do {
00871         code = avio_r8(pb);
00872         value = avio_r8(pb);
00873         av_dlog(NULL, "pixel layout: code %#x\n", code);
00874 
00875         if (ofs < 16) {
00876             layout[ofs++] = code;
00877             layout[ofs++] = value;
00878         }
00879     } while (code != 0); /* SMPTE 377M E.2.46 */
00880 
00881     ff_mxf_decode_pixel_layout(layout, &descriptor->pix_fmt);
00882 }
00883 
00884 static int mxf_read_generic_descriptor(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
00885 {
00886     MXFDescriptor *descriptor = arg;
00887     switch(tag) {
00888     case 0x3F01:
00889         descriptor->sub_descriptors_count = avio_rb32(pb);
00890         if (descriptor->sub_descriptors_count >= UINT_MAX / sizeof(UID))
00891             return -1;
00892         descriptor->sub_descriptors_refs = av_malloc(descriptor->sub_descriptors_count * sizeof(UID));
00893         if (!descriptor->sub_descriptors_refs)
00894             return -1;
00895         avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */
00896         avio_read(pb, (uint8_t *)descriptor->sub_descriptors_refs, descriptor->sub_descriptors_count * sizeof(UID));
00897         break;
00898     case 0x3004:
00899         avio_read(pb, descriptor->essence_container_ul, 16);
00900         break;
00901     case 0x3006:
00902         descriptor->linked_track_id = avio_rb32(pb);
00903         break;
00904     case 0x3201: /* PictureEssenceCoding */
00905         avio_read(pb, descriptor->essence_codec_ul, 16);
00906         break;
00907     case 0x3203:
00908         descriptor->width = avio_rb32(pb);
00909         break;
00910     case 0x3202:
00911         descriptor->height = avio_rb32(pb);
00912         break;
00913     case 0x320E:
00914         descriptor->aspect_ratio.num = avio_rb32(pb);
00915         descriptor->aspect_ratio.den = avio_rb32(pb);
00916         break;
00917     case 0x3D03:
00918         descriptor->sample_rate.num = avio_rb32(pb);
00919         descriptor->sample_rate.den = avio_rb32(pb);
00920         break;
00921     case 0x3D06: /* SoundEssenceCompression */
00922         avio_read(pb, descriptor->essence_codec_ul, 16);
00923         break;
00924     case 0x3D07:
00925         descriptor->channels = avio_rb32(pb);
00926         break;
00927     case 0x3D01:
00928         descriptor->bits_per_sample = avio_rb32(pb);
00929         break;
00930     case 0x3401:
00931         mxf_read_pixel_layout(pb, descriptor);
00932         break;
00933     default:
00934         /* Private uid used by SONY C0023S01.mxf */
00935         if (IS_KLV_KEY(uid, mxf_sony_mpeg4_extradata)) {
00936             descriptor->extradata = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
00937             if (!descriptor->extradata)
00938                 return -1;
00939             descriptor->extradata_size = size;
00940             avio_read(pb, descriptor->extradata, size);
00941         }
00942         break;
00943     }
00944     return 0;
00945 }
00946 
00947 /*
00948  * Match an uid independently of the version byte and up to len common bytes
00949  * Returns: boolean
00950  */
00951 static int mxf_match_uid(const UID key, const UID uid, int len)
00952 {
00953     int i;
00954     for (i = 0; i < len; i++) {
00955         if (i != 7 && key[i] != uid[i])
00956             return 0;
00957     }
00958     return 1;
00959 }
00960 
00961 static const MXFCodecUL *mxf_get_codec_ul(const MXFCodecUL *uls, UID *uid)
00962 {
00963     while (uls->uid[0]) {
00964         if(mxf_match_uid(uls->uid, *uid, uls->matching_len))
00965             break;
00966         uls++;
00967     }
00968     return uls;
00969 }
00970 
00971 static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref, enum MXFMetadataSetType type)
00972 {
00973     int i;
00974 
00975     if (!strong_ref)
00976         return NULL;
00977     for (i = 0; i < mxf->metadata_sets_count; i++) {
00978         if (!memcmp(*strong_ref, mxf->metadata_sets[i]->uid, 16) &&
00979             (type == AnyType || mxf->metadata_sets[i]->type == type)) {
00980             return mxf->metadata_sets[i];
00981         }
00982     }
00983     return NULL;
00984 }
00985 
00986 static const MXFCodecUL mxf_picture_essence_container_uls[] = {
00987     // video essence container uls
00988     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */
00989     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */
00990     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },
00991 };
00992 static const MXFCodecUL mxf_sound_essence_container_uls[] = {
00993     // sound essence container uls
00994     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */
00995     { { 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 */
00996     { { 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 */
00997     { { 0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0xFF,0x4B,0x46,0x41,0x41,0x00,0x0D,0x4D,0x4F }, 14, CODEC_ID_PCM_S16LE }, /* 0001GL00.MXF.A1.mxf_opatom.mxf */
00998     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },
00999 };
01000 
01001 static UID mxf_d10_ul = { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 };
01002 
01003 static int mxf_get_sorted_table_segments(MXFContext *mxf, int *nb_sorted_segments, MXFIndexTableSegment ***sorted_segments)
01004 {
01005     int i, j, nb_segments = 0;
01006     MXFIndexTableSegment **unsorted_segments;
01007     int last_body_sid = -1, last_index_sid = -1, last_index_start = -1;
01008 
01009     /* count number of segments, allocate arrays and copy unsorted segments */
01010     for (i = 0; i < mxf->metadata_sets_count; i++)
01011         if (mxf->metadata_sets[i]->type == IndexTableSegment)
01012             nb_segments++;
01013 
01014     if (!(unsorted_segments = av_calloc(nb_segments, sizeof(*unsorted_segments))) ||
01015         !(*sorted_segments  = av_calloc(nb_segments, sizeof(**sorted_segments)))) {
01016         av_free(unsorted_segments);
01017         return AVERROR(ENOMEM);
01018     }
01019 
01020     for (i = j = 0; i < mxf->metadata_sets_count; i++)
01021         if (mxf->metadata_sets[i]->type == IndexTableSegment)
01022             unsorted_segments[j++] = (MXFIndexTableSegment*)mxf->metadata_sets[i];
01023 
01024     *nb_sorted_segments = 0;
01025 
01026     /* sort segments by {BodySID, IndexSID, IndexStartPosition}, remove duplicates while we're at it */
01027     for (i = 0; i < nb_segments; i++) {
01028         int best = -1, best_body_sid = -1, best_index_sid = -1, best_index_start = -1;
01029 
01030         for (j = 0; j < nb_segments; j++) {
01031             MXFIndexTableSegment *s = unsorted_segments[j];
01032 
01033             /* Require larger BosySID, IndexSID or IndexStartPosition then the previous entry. This removes duplicates.
01034              * We want the smallest values for the keys than what we currently have, unless this is the first such entry this time around.
01035              */
01036             if ((i == 0     || s->body_sid > last_body_sid || s->index_sid > last_index_sid || s->index_start_position > last_index_start) &&
01037                 (best == -1 || s->body_sid < best_body_sid || s->index_sid < best_index_sid || s->index_start_position < best_index_start)) {
01038                 best             = j;
01039                 best_body_sid    = s->body_sid;
01040                 best_index_sid   = s->index_sid;
01041                 best_index_start = s->index_start_position;
01042             }
01043         }
01044 
01045         /* no suitable entry found -> we're done */
01046         if (best == -1)
01047             break;
01048 
01049         (*sorted_segments)[(*nb_sorted_segments)++] = unsorted_segments[best];
01050         last_body_sid    = best_body_sid;
01051         last_index_sid   = best_index_sid;
01052         last_index_start = best_index_start;
01053     }
01054 
01055     av_free(unsorted_segments);
01056 
01057     return 0;
01058 }
01059 
01063 static int mxf_absolute_bodysid_offset(MXFContext *mxf, int body_sid, int64_t offset, int64_t *offset_out)
01064 {
01065     int x;
01066     int64_t offset_in = offset;     /* for logging */
01067 
01068     for (x = 0; x < mxf->partitions_count; x++) {
01069         MXFPartition *p = &mxf->partitions[x];
01070 
01071         if (p->body_sid != body_sid)
01072             continue;
01073 
01074         if (offset < p->essence_length || !p->essence_length) {
01075             *offset_out = p->essence_offset + offset;
01076             return 0;
01077         }
01078 
01079         offset -= p->essence_length;
01080     }
01081 
01082     av_log(mxf->fc, AV_LOG_ERROR, "failed to find absolute offset of %lx in BodySID %i - partial file?\n",
01083            offset_in, body_sid);
01084 
01085     return AVERROR_INVALIDDATA;
01086 }
01087 
01088 static int mxf_parse_index(MXFContext *mxf, int track_id, AVStream *st)
01089 {
01090     int64_t accumulated_offset = 0;
01091     int j, k, ret, nb_sorted_segments;
01092     MXFIndexTableSegment **sorted_segments = NULL;
01093     int n_delta = track_id - 1;  /* TrackID = 1-based stream index */
01094 
01095     if (track_id < 1) {
01096         av_log(mxf->fc, AV_LOG_ERROR, "TrackID not positive: %i\n", track_id);
01097         ret = AVERROR_INVALIDDATA;
01098         goto err_out;
01099     }
01100 
01101     if ((ret = mxf_get_sorted_table_segments(mxf, &nb_sorted_segments, &sorted_segments)))
01102         goto err_out;
01103 
01104     if (nb_sorted_segments <= 0) {
01105         av_log(mxf->fc, AV_LOG_WARNING, "Empty index for stream %i\n", st->index);
01106         ret = 0;
01107         goto err_out;
01108     }
01109 
01110     for (j = 0; j < nb_sorted_segments; j++) {
01111         int duration, sample_duration = 1, last_sample_size = 0;
01112         int64_t segment_size;
01113         MXFIndexTableSegment *tableseg = sorted_segments[j];
01114 
01115         /* reset accumulated_offset on BodySID change */
01116         if (j > 0 && tableseg->body_sid != sorted_segments[j-1]->body_sid)
01117             accumulated_offset = 0;
01118 
01119         if (n_delta >= tableseg->nb_delta_entries && st->index != 0)
01120             continue;
01121         duration = tableseg->index_duration > 0 ? tableseg->index_duration :
01122             st->duration - st->nb_index_entries;
01123         segment_size = tableseg->edit_unit_byte_count * duration;
01124         /* check small EditUnitByteCount for audio */
01125         if (tableseg->edit_unit_byte_count && tableseg->edit_unit_byte_count < 32
01126             && !tableseg->index_duration) {
01127             /* duration might be prime relative to the new sample_duration,
01128              * which means we need to handle the last frame differently */
01129             sample_duration = 8192;
01130             last_sample_size = (duration % sample_duration) * tableseg->edit_unit_byte_count;
01131             tableseg->edit_unit_byte_count *= sample_duration;
01132             duration /= sample_duration;
01133             if (last_sample_size) duration++;
01134         }
01135 
01136         if (duration <= 0) {
01137             av_log(mxf->fc, AV_LOG_WARNING, "0 duration in index for stream %i\n", st->index);
01138             ret = 0;
01139             goto err_out;
01140         }
01141 
01142         for (k = 0; k < duration; k++) {
01143             int64_t pos;
01144             int size, flags = 0;
01145 
01146             if (k < tableseg->nb_index_entries) {
01147                 pos = tableseg->stream_offset_entries[k];
01148                 if (n_delta < tableseg->nb_delta_entries) {
01149                     if (n_delta < tableseg->nb_delta_entries - 1) {
01150                         size =
01151                             tableseg->slice_offset_entries[k][tableseg->slice[n_delta+1]-1] +
01152                             tableseg->element_delta[n_delta+1] -
01153                             tableseg->element_delta[n_delta];
01154                         if (tableseg->slice[n_delta] > 0)
01155                             size -= tableseg->slice_offset_entries[k][tableseg->slice[n_delta]-1];
01156                     } else if (k < duration - 1) {
01157                         size = tableseg->stream_offset_entries[k+1] -
01158                             tableseg->stream_offset_entries[k] -
01159                             tableseg->slice_offset_entries[k][tableseg->slice[tableseg->nb_delta_entries-1]-1] -
01160                             tableseg->element_delta[tableseg->nb_delta_entries-1];
01161                     } else
01162                         size = 0;
01163                     if (tableseg->slice[n_delta] > 0)
01164                         pos += tableseg->slice_offset_entries[k][tableseg->slice[n_delta]-1];
01165                     pos += tableseg->element_delta[n_delta];
01166                 } else
01167                     size = 0;
01168                 flags = !(tableseg->flag_entries[k] & 0x30) ? AVINDEX_KEYFRAME : 0;
01169             } else {
01170                 pos = (int64_t)k * tableseg->edit_unit_byte_count + accumulated_offset;
01171                 if (n_delta < tableseg->nb_delta_entries - 1)
01172                     size = tableseg->element_delta[n_delta+1] - tableseg->element_delta[n_delta];
01173                 else {
01174                     /* use smaller size for last sample if we should */
01175                     if (last_sample_size && k == duration - 1)
01176                         size = last_sample_size;
01177                     else
01178                         size = tableseg->edit_unit_byte_count;
01179                     if (tableseg->nb_delta_entries)
01180                         size -= tableseg->element_delta[tableseg->nb_delta_entries-1];
01181                 }
01182                 if (n_delta < tableseg->nb_delta_entries)
01183                     pos += tableseg->element_delta[n_delta];
01184                 flags = AVINDEX_KEYFRAME;
01185             }
01186 
01187             if (mxf_absolute_bodysid_offset(mxf, tableseg->body_sid, pos, &pos) < 0) {
01188                 /* probably partial file - no point going further for this stream */
01189                 break;
01190             }
01191 
01192             av_dlog(mxf->fc, "Stream %d IndexEntry %d TrackID %d Offset %"PRIx64" Timestamp %"PRId64"\n",
01193                     st->index, st->nb_index_entries, track_id, pos, sample_duration * st->nb_index_entries);
01194 
01195             if ((ret = av_add_index_entry(st, pos, sample_duration * st->nb_index_entries, size, 0, flags)) < 0)
01196                 return ret;
01197         }
01198         accumulated_offset += segment_size;
01199     }
01200 
01201     av_free(sorted_segments);
01202 
01203     return 0;
01204 
01205 err_out:
01206     av_free(sorted_segments);
01207     mxf->broken_index = 1;
01208     return ret;
01209 }
01210 
01211 static int mxf_parse_structural_metadata(MXFContext *mxf)
01212 {
01213     MXFPackage *material_package = NULL;
01214     MXFPackage *temp_package = NULL;
01215     int i, j, k, ret;
01216 
01217     av_dlog(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);
01218     /* TODO: handle multiple material packages (OP3x) */
01219     for (i = 0; i < mxf->packages_count; i++) {
01220         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);
01221         if (material_package) break;
01222     }
01223     if (!material_package) {
01224         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");
01225         return -1;
01226     }
01227 
01228     for (i = 0; i < material_package->tracks_count; i++) {
01229         MXFPackage *source_package = NULL;
01230         MXFTrack *material_track = NULL;
01231         MXFTrack *source_track = NULL;
01232         MXFTrack *temp_track = NULL;
01233         MXFDescriptor *descriptor = NULL;
01234         MXFStructuralComponent *component = NULL;
01235         UID *essence_container_ul = NULL;
01236         const MXFCodecUL *codec_ul = NULL;
01237         const MXFCodecUL *container_ul = NULL;
01238         AVStream *st;
01239 
01240         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {
01241             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");
01242             continue;
01243         }
01244 
01245         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {
01246             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");
01247             continue;
01248         }
01249 
01250         /* TODO: handle multiple source clips */
01251         for (j = 0; j < material_track->sequence->structural_components_count; j++) {
01252             /* TODO: handle timecode component */
01253             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);
01254             if (!component)
01255                 continue;
01256 
01257             for (k = 0; k < mxf->packages_count; k++) {
01258                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);
01259                 if (!temp_package)
01260                     continue;
01261                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {
01262                     source_package = temp_package;
01263                     break;
01264                 }
01265             }
01266             if (!source_package) {
01267                 av_dlog(mxf->fc, "material track %d: no corresponding source package found\n", material_track->track_id);
01268                 break;
01269             }
01270             for (k = 0; k < source_package->tracks_count; k++) {
01271                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {
01272                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");
01273                     return -1;
01274                 }
01275                 if (temp_track->track_id == component->source_track_id) {
01276                     source_track = temp_track;
01277                     break;
01278                 }
01279             }
01280             if (!source_track) {
01281                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);
01282                 break;
01283             }
01284         }
01285         if (!source_track || !component)
01286             continue;
01287 
01288         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {
01289             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");
01290             return -1;
01291         }
01292 
01293         /* 0001GL00.MXF.A1.mxf_opatom.mxf has the same SourcePackageID as 0001GL.MXF.V1.mxf_opatom.mxf
01294          * This would result in both files appearing to have two streams. Work around this by sanity checking DataDefinition */
01295         if (memcmp(material_track->sequence->data_definition_ul, source_track->sequence->data_definition_ul, 16)) {
01296             av_log(mxf->fc, AV_LOG_ERROR, "material track %d: DataDefinition mismatch\n", material_track->track_id);
01297             continue;
01298         }
01299 
01300         st = avformat_new_stream(mxf->fc, NULL);
01301         if (!st) {
01302             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");
01303             return -1;
01304         }
01305         st->id = source_track->track_id;
01306         st->priv_data = source_track;
01307         st->duration = component->duration;
01308         if (st->duration == -1)
01309             st->duration = AV_NOPTS_VALUE;
01310         st->start_time = component->start_position;
01311         avpriv_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);
01312 
01313         PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);
01314         codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);
01315         st->codec->codec_type = codec_ul->id;
01316 
01317         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);
01318         if (source_package->descriptor) {
01319             if (source_package->descriptor->type == MultipleDescriptor) {
01320                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {
01321                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);
01322 
01323                     if (!sub_descriptor) {
01324                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");
01325                         continue;
01326                     }
01327                     if (sub_descriptor->linked_track_id == source_track->track_id) {
01328                         descriptor = sub_descriptor;
01329                         break;
01330                     }
01331                 }
01332             } else if (source_package->descriptor->type == Descriptor)
01333                 descriptor = source_package->descriptor;
01334         }
01335         if (!descriptor) {
01336             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);
01337             continue;
01338         }
01339         PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);
01340         PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);
01341         essence_container_ul = &descriptor->essence_container_ul;
01342         /* HACK: replacing the original key with mxf_encrypted_essence_container
01343          * is not allowed according to s429-6, try to find correct information anyway */
01344         if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {
01345             av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");
01346             for (k = 0; k < mxf->metadata_sets_count; k++) {
01347                 MXFMetadataSet *metadata = mxf->metadata_sets[k];
01348                 if (metadata->type == CryptoContext) {
01349                     essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;
01350                     break;
01351                 }
01352             }
01353         }
01354 
01355         /* HACK: revert to the old demuxing/seeking scode for D-10 for now */
01356         if (mxf_match_uid(essence_container_ul, mxf_d10_ul, 14))
01357             mxf->d10 = 1;
01358 
01359         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */
01360         codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);
01361         st->codec->codec_id = codec_ul->id;
01362         if (descriptor->extradata) {
01363             st->codec->extradata = descriptor->extradata;
01364             st->codec->extradata_size = descriptor->extradata_size;
01365         }
01366         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
01367             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, essence_container_ul);
01368             if (st->codec->codec_id == CODEC_ID_NONE)
01369                 st->codec->codec_id = container_ul->id;
01370             st->codec->width = descriptor->width;
01371             st->codec->height = descriptor->height;
01372             if (st->codec->codec_id == CODEC_ID_RAWVIDEO)
01373                 st->codec->pix_fmt = descriptor->pix_fmt;
01374             st->need_parsing = AVSTREAM_PARSE_HEADERS;
01375         } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
01376             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, essence_container_ul);
01377             if (st->codec->codec_id == CODEC_ID_NONE)
01378                 st->codec->codec_id = container_ul->id;
01379             st->codec->channels = descriptor->channels;
01380             st->codec->bits_per_coded_sample = descriptor->bits_per_sample;
01381             st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;
01382             /* TODO: implement CODEC_ID_RAWAUDIO */
01383             if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {
01384                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)
01385                     st->codec->codec_id = CODEC_ID_PCM_S24LE;
01386                 else if (descriptor->bits_per_sample == 32)
01387                     st->codec->codec_id = CODEC_ID_PCM_S32LE;
01388             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {
01389                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)
01390                     st->codec->codec_id = CODEC_ID_PCM_S24BE;
01391                 else if (descriptor->bits_per_sample == 32)
01392                     st->codec->codec_id = CODEC_ID_PCM_S32BE;
01393             } else if (st->codec->codec_id == CODEC_ID_MP2) {
01394                 st->need_parsing = AVSTREAM_PARSE_FULL;
01395             }
01396         }
01397         if (st->codec->codec_type != AVMEDIA_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {
01398             /* TODO: decode timestamps */
01399             st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
01400         }
01401 
01402         if ((ret = mxf_parse_index(mxf, material_track->track_id, st)))
01403             return ret;
01404     }
01405     return 0;
01406 }
01407 
01408 static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {
01409     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },
01410     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }, mxf_read_partition_pack },
01411     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x02,0x00 }, mxf_read_partition_pack },
01412     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x03,0x00 }, mxf_read_partition_pack },
01413     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }, mxf_read_partition_pack },
01414     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x01,0x00 }, mxf_read_partition_pack },
01415     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x02,0x00 }, mxf_read_partition_pack },
01416     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x03,0x00 }, mxf_read_partition_pack },
01417     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }, mxf_read_partition_pack },
01418     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x02,0x00 }, mxf_read_partition_pack },
01419     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }, mxf_read_partition_pack },
01420     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },
01421     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },
01422     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },
01423     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },
01424     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },
01425     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },
01426     { { 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 */
01427     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */
01428     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */
01429     { { 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 */
01430     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */
01431     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */
01432     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */
01433     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */
01434     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },
01435     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },
01436     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },
01437 };
01438 
01439 static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadFunc *read_child, int ctx_size, enum MXFMetadataSetType type)
01440 {
01441     AVIOContext *pb = mxf->fc->pb;
01442     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;
01443     uint64_t klv_end = avio_tell(pb) + klv->length;
01444 
01445     if (!ctx)
01446         return -1;
01447     while (avio_tell(pb) + 4 < klv_end && !url_feof(pb)) {
01448         int tag = avio_rb16(pb);
01449         int size = avio_rb16(pb); /* KLV specified by 0x53 */
01450         uint64_t next = avio_tell(pb) + size;
01451         UID uid = {0};
01452 
01453         av_dlog(mxf->fc, "local tag %#04x size %d\n", tag, size);
01454         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */
01455             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);
01456             continue;
01457         }
01458         if (tag > 0x7FFF) { /* dynamic tag */
01459             int i;
01460             for (i = 0; i < mxf->local_tags_count; i++) {
01461                 int local_tag = AV_RB16(mxf->local_tags+i*18);
01462                 if (local_tag == tag) {
01463                     memcpy(uid, mxf->local_tags+i*18+2, 16);
01464                     av_dlog(mxf->fc, "local tag %#04x\n", local_tag);
01465                     PRINT_KEY(mxf->fc, "uid", uid);
01466                 }
01467             }
01468         }
01469         if (ctx_size && tag == 0x3C0A)
01470             avio_read(pb, ctx->uid, 16);
01471         else if (read_child(ctx, pb, tag, size, uid, -1) < 0)
01472             return -1;
01473 
01474         avio_seek(pb, next, SEEK_SET);
01475     }
01476     if (ctx_size) ctx->type = type;
01477     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;
01478 }
01479 
01484 static int mxf_seek_to_previous_partition(MXFContext *mxf)
01485 {
01486     AVIOContext *pb = mxf->fc->pb;
01487 
01488     if (!mxf->current_partition ||
01489         mxf->run_in + mxf->current_partition->previous_partition <= mxf->last_forward_tell)
01490         return 0;   /* we've parsed all partitions */
01491 
01492     /* seek to previous partition */
01493     avio_seek(pb, mxf->run_in + mxf->current_partition->previous_partition, SEEK_SET);
01494     mxf->current_partition = NULL;
01495 
01496     av_dlog(mxf->fc, "seeking to previous partition\n");
01497 
01498     return 1;
01499 }
01500 
01505 static int mxf_parse_handle_essence(MXFContext *mxf)
01506 {
01507     AVIOContext *pb = mxf->fc->pb;
01508     int64_t ret;
01509 
01510     if (mxf->parsing_backward) {
01511         return mxf_seek_to_previous_partition(mxf);
01512     } else {
01513         if (!mxf->footer_partition) {
01514             av_dlog(mxf->fc, "no footer\n");
01515             return 0;
01516         }
01517 
01518         av_dlog(mxf->fc, "seeking to footer\n");
01519 
01520         /* remember where we were so we don't end up seeking further back than this */
01521         mxf->last_forward_tell = avio_tell(pb);
01522 
01523         if (!pb->seekable) {
01524             av_log(mxf->fc, AV_LOG_INFO, "file is not seekable - not parsing footer\n");
01525             return -1;
01526         }
01527 
01528         /* seek to footer partition and parse backward */
01529         if ((ret = avio_seek(pb, mxf->run_in + mxf->footer_partition, SEEK_SET)) < 0) {
01530             av_log(mxf->fc, AV_LOG_ERROR, "failed to seek to footer @ 0x%"PRIx64" (%"PRId64") - partial file?\n",
01531                    mxf->run_in + mxf->footer_partition, ret);
01532             return ret;
01533         }
01534 
01535         mxf->current_partition = NULL;
01536         mxf->parsing_backward = 1;
01537     }
01538 
01539     return 1;
01540 }
01541 
01546 static int mxf_parse_handle_partition_or_eof(MXFContext *mxf)
01547 {
01548     return mxf->parsing_backward ? mxf_seek_to_previous_partition(mxf) : 1;
01549 }
01550 
01554 static void mxf_compute_essence_containers(MXFContext *mxf)
01555 {
01556     int x;
01557 
01558     /* everything is already correct */
01559     if (mxf->op == OPAtom)
01560         return;
01561 
01562     for (x = 0; x < mxf->partitions_count; x++) {
01563         MXFPartition *p = &mxf->partitions[x];
01564 
01565         if (!p->body_sid)
01566             continue;       /* BodySID == 0 -> no essence */
01567 
01568         if (x >= mxf->partitions_count - 1)
01569             break;          /* last partition - can't compute length (and we don't need to) */
01570 
01571         /* essence container spans to the next partition */
01572         p->essence_length = mxf->partitions[x+1].this_partition - p->essence_offset;
01573 
01574         if (p->essence_length < 0) {
01575             /* next ThisPartition < essence_offset */
01576             p->essence_length = 0;
01577             av_log(mxf->fc, AV_LOG_ERROR, "partition %i: bad ThisPartition = %lx\n",
01578                    x+1, mxf->partitions[x+1].this_partition);
01579         }
01580     }
01581 }
01582 
01583 static int64_t round_to_kag(int64_t position, int kag_size)
01584 {
01585     /* TODO: account for run-in? the spec isn't clear whether KAG should account for it */
01586     /* NOTE: kag_size may be any integer between 1 - 2^10 */
01587     int64_t ret = (position / kag_size) * kag_size;
01588     return ret == position ? ret : ret + kag_size;
01589 }
01590 
01591 static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)
01592 {
01593     MXFContext *mxf = s->priv_data;
01594     KLVPacket klv;
01595     int64_t essence_offset = 0;
01596 
01597     mxf->last_forward_tell = INT64_MAX;
01598 
01599     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {
01600         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");
01601         return -1;
01602     }
01603     avio_seek(s->pb, -14, SEEK_CUR);
01604     mxf->fc = s;
01605     mxf->run_in = avio_tell(s->pb);
01606 
01607     while (!url_feof(s->pb)) {
01608         const MXFMetadataReadTableEntry *metadata;
01609 
01610         if (klv_read_packet(&klv, s->pb) < 0) {
01611             /* EOF - seek to previous partition or stop */
01612             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)
01613                 break;
01614             else
01615                 continue;
01616         }
01617 
01618         PRINT_KEY(s, "read header", klv.key);
01619         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);
01620         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||
01621             IS_KLV_KEY(klv.key, mxf_essence_element_key) ||
01622             IS_KLV_KEY(klv.key, mxf_system_item_key)) {
01623 
01624             if (!mxf->current_partition) {
01625                 av_log(mxf->fc, AV_LOG_ERROR, "found essence prior to first PartitionPack\n");
01626                 return AVERROR_INVALIDDATA;
01627             }
01628 
01629             if (!mxf->current_partition->essence_offset) {
01630                 /* for OP1a we compute essence_offset
01631                  * for OPAtom we point essence_offset after the KL (usually op1a_essence_offset + 20 or 25)
01632                  * TODO: for OP1a we could eliminate this entire if statement, always stopping parsing at op1a_essence_offset
01633                  *       for OPAtom we still need the actual essence_offset though (the KL's length can vary)
01634                  */
01635                 int64_t op1a_essence_offset =
01636                     round_to_kag(mxf->current_partition->this_partition +
01637                                  mxf->current_partition->pack_length,       mxf->current_partition->kag_size) +
01638                     round_to_kag(mxf->current_partition->header_byte_count, mxf->current_partition->kag_size) +
01639                     round_to_kag(mxf->current_partition->index_byte_count,  mxf->current_partition->kag_size);
01640 
01641                 if (mxf->op == OPAtom) {
01642                     /* point essence_offset to the actual data
01643                     * OPAtom has all the essence in one big KLV
01644                     */
01645                     mxf->current_partition->essence_offset = avio_tell(s->pb);
01646                     mxf->current_partition->essence_length = klv.length;
01647                 } else {
01648                     /* NOTE: op1a_essence_offset may be less than to klv.offset (C0023S01.mxf)  */
01649                     mxf->current_partition->essence_offset = op1a_essence_offset;
01650                 }
01651             }
01652 
01653             if (!essence_offset)
01654                 essence_offset = klv.offset;
01655 
01656             /* seek to footer, previous partition or stop */
01657             if (mxf_parse_handle_essence(mxf) <= 0)
01658                 break;
01659             continue;
01660         } else if (!memcmp(klv.key, mxf_header_partition_pack_key, 13) &&
01661                    klv.key[13] >= 2 && klv.key[13] <= 4 && mxf->current_partition) {
01662             /* next partition pack - keep going, seek to previous partition or stop */
01663             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)
01664                 break;
01665             else if (mxf->parsing_backward)
01666                 continue;
01667             /* we're still parsing forward. proceed to parsing this partition pack */
01668         }
01669 
01670         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {
01671             if (IS_KLV_KEY(klv.key, metadata->key)) {
01672                 int res;
01673                 if (klv.key[5] == 0x53) {
01674                     res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);
01675                 } else {
01676                     uint64_t next = avio_tell(s->pb) + klv.length;
01677                     res = metadata->read(mxf, s->pb, 0, klv.length, klv.key, klv.offset);
01678                     avio_seek(s->pb, next, SEEK_SET);
01679                 }
01680                 if (res < 0) {
01681                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");
01682                     return -1;
01683                 }
01684                 break;
01685             }
01686         }
01687         if (!metadata->read)
01688             avio_skip(s->pb, klv.length);
01689     }
01690     /* FIXME avoid seek */
01691     if (!essence_offset)  {
01692         av_log(s, AV_LOG_ERROR, "no essence\n");
01693         return AVERROR_INVALIDDATA;
01694     }
01695     avio_seek(s->pb, essence_offset, SEEK_SET);
01696 
01697     mxf_compute_essence_containers(mxf);
01698 
01699     return mxf_parse_structural_metadata(mxf);
01700 }
01701 
01702 static int mxf_read_close(AVFormatContext *s)
01703 {
01704     MXFContext *mxf = s->priv_data;
01705     MXFIndexTableSegment *seg;
01706     int i, j;
01707 
01708     av_freep(&mxf->packages_refs);
01709 
01710     for (i = 0; i < s->nb_streams; i++)
01711         s->streams[i]->priv_data = NULL;
01712 
01713     for (i = 0; i < mxf->metadata_sets_count; i++) {
01714         switch (mxf->metadata_sets[i]->type) {
01715         case MultipleDescriptor:
01716             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);
01717             break;
01718         case Sequence:
01719             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);
01720             break;
01721         case SourcePackage:
01722         case MaterialPackage:
01723             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);
01724             break;
01725         case IndexTableSegment:
01726             seg = (MXFIndexTableSegment *)mxf->metadata_sets[i];
01727             if (seg->slice_count)
01728             for (j = 0; j < seg->nb_index_entries; j++)
01729                 av_freep(&seg->slice_offset_entries[j]);
01730             av_freep(&seg->slice);
01731             av_freep(&seg->element_delta);
01732             av_freep(&seg->temporal_offset_entries);
01733             av_freep(&seg->flag_entries);
01734             av_freep(&seg->stream_offset_entries);
01735             av_freep(&seg->slice_offset_entries);
01736             break;
01737         default:
01738             break;
01739         }
01740         av_freep(&mxf->metadata_sets[i]);
01741     }
01742     av_freep(&mxf->partitions);
01743     av_freep(&mxf->metadata_sets);
01744     av_freep(&mxf->aesc);
01745     av_freep(&mxf->local_tags);
01746     return 0;
01747 }
01748 
01749 static int mxf_probe(AVProbeData *p) {
01750     uint8_t *bufp = p->buf;
01751     uint8_t *end = p->buf + p->buf_size;
01752 
01753     if (p->buf_size < sizeof(mxf_header_partition_pack_key))
01754         return 0;
01755 
01756     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */
01757     end -= sizeof(mxf_header_partition_pack_key);
01758     for (; bufp < end; bufp++) {
01759         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))
01760             return AVPROBE_SCORE_MAX;
01761     }
01762     return 0;
01763 }
01764 
01765 /* rudimentary byte seek */
01766 /* XXX: use MXF Index */
01767 static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
01768 {
01769     AVStream *st = s->streams[stream_index];
01770     int64_t seconds;
01771     MXFContext* mxf = s->priv_data;
01772     int64_t seekpos;
01773     int index;
01774 
01775     if (mxf->op != OPAtom) {
01776     if (!s->bit_rate)
01777         return -1;
01778     if (sample_time < 0)
01779         sample_time = 0;
01780     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);
01781     if (avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET) < 0)
01782         return -1;
01783     ff_update_cur_dts(s, st, sample_time);
01784     } else {
01785         if (st->nb_index_entries <= 0)
01786             return -1;
01787 
01788         index = av_index_search_timestamp(st, sample_time, flags);
01789 
01790         av_dlog(s, "stream %d, timestamp %"PRId64", sample %d\n", st->index, sample_time, index);
01791 
01792         if (index < 0) {
01793             if (sample_time < st->index_entries[0].timestamp)
01794                 index = 0;
01795             else
01796                 return -1;
01797         }
01798 
01799         seekpos = st->index_entries[index].pos;
01800         av_update_cur_dts(s, st, st->index_entries[index].timestamp);
01801         mxf->current_edit_unit = st->index_entries[index].timestamp;
01802         mxf->current_stream = 0;
01803         avio_seek(s->pb, seekpos, SEEK_SET);
01804     }
01805     return 0;
01806 }
01807 
01808 AVInputFormat ff_mxf_demuxer = {
01809     .name           = "mxf",
01810     .long_name      = NULL_IF_CONFIG_SMALL("Material eXchange Format"),
01811     .priv_data_size = sizeof(MXFContext),
01812     .read_probe     = mxf_probe,
01813     .read_header    = mxf_read_header,
01814     .read_packet    = mxf_read_packet,
01815     .read_close     = mxf_read_close,
01816     .read_seek      = mxf_read_seek,
01817 };