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ffmpeg/libavformat/mxfdec.c
Tomas Härdin b720915be1 mxfdec: Fix files > 2 GiB 
Accumulating into an int would cause overflow for files with essence
containers larger than 2 GiB.
2012-01-24 12:42:32 +01:00

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/*
* 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 "libavutil/mathematics.h"
#include "libavcodec/bytestream.h"
#include "avformat.h"
#include "internal.h"
#include "mxf.h"
typedef enum {
Header,
BodyPartition,
Footer
} MXFPartitionType;
typedef enum {
OP1a = 1,
OP1b,
OP1c,
OP2a,
OP2b,
OP2c,
OP3a,
OP3b,
OP3c,
OPAtom,
OPSONYOpt, /* FATE sample, violates the spec in places */
} MXFOP;
typedef struct {
int closed;
int complete;
MXFPartitionType type;
uint64_t previous_partition;
int index_sid;
int body_sid;
int64_t this_partition;
int64_t essence_offset; ///< absolute offset of essence
int64_t essence_length;
int32_t kag_size;
int64_t header_byte_count;
int64_t index_byte_count;
int pack_length;
} MXFPartition;
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;
enum PixelFormat pix_fmt;
} MXFDescriptor;
typedef struct {
UID uid;
enum MXFMetadataSetType type;
int edit_unit_byte_count;
int index_sid;
int body_sid;
AVRational index_edit_rate;
uint64_t index_start_position;
uint64_t index_duration;
int8_t *temporal_offset_entries;
int *flag_entries;
uint64_t *stream_offset_entries;
int nb_index_entries;
} MXFIndexTableSegment;
typedef struct {
UID uid;
enum MXFMetadataSetType type;
UID package_uid;
UID *tracks_refs;
int tracks_count;
MXFDescriptor *descriptor; /* only one */
UID descriptor_ref;
} MXFPackage;
typedef struct {
UID uid;
enum MXFMetadataSetType type;
} MXFMetadataSet;
/* decoded index table */
typedef struct {
int index_sid;
int body_sid;
int nb_ptses; /* number of PTSes or total duration of index */
int64_t first_dts; /* DTS = EditUnit + first_dts */
int64_t *ptses; /* maps EditUnit -> PTS */
int nb_segments;
MXFIndexTableSegment **segments; /* sorted by IndexStartPosition */
AVIndexEntry *fake_index; /* used for calling ff_index_search_timestamp() */
} MXFIndexTable;
typedef struct {
MXFPartition *partitions;
unsigned partitions_count;
MXFOP op;
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;
uint64_t footer_partition;
KLVPacket current_klv_data;
int current_klv_index;
int run_in;
MXFPartition *current_partition;
int parsing_backward;
int64_t last_forward_tell;
int last_forward_partition;
int current_edit_unit;
int nb_index_tables;
MXFIndexTable *index_tables;
int edit_units_per_packet; ///< how many edit units to read at a time (PCM, OPAtom)
} MXFContext;
enum MXFWrappingScheme {
Frame,
Clip,
};
/* NOTE: klv_offset is not set (-1) for local keys */
typedef int MXFMetadataReadFunc(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset);
typedef struct {
const UID key;
MXFMetadataReadFunc *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_avid_essence_element_key[] = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0e,0x04,0x03,0x01 };
static const uint8_t mxf_system_item_key[] = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x03,0x01,0x04 };
static const uint8_t mxf_klv_key[] = { 0x06,0x0e,0x2b,0x34 };
/* complete keys to match */
static const uint8_t mxf_crypto_source_container_ul[] = { 0x06,0x0e,0x2b,0x34,0x01,0x01,0x01,0x09,0x06,0x01,0x01,0x02,0x02,0x00,0x00,0x00 };
static const uint8_t mxf_encrypted_triplet_key[] = { 0x06,0x0e,0x2b,0x34,0x02,0x04,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x7e,0x01,0x00 };
static const uint8_t mxf_encrypted_essence_container[] = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x0b,0x01,0x00 };
static const uint8_t mxf_sony_mpeg4_extradata[] = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0e,0x06,0x06,0x02,0x02,0x01,0x00,0x00 };
#define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y)))
static int64_t klv_decode_ber_length(AVIOContext *pb)
{
uint64_t size = avio_r8(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 AVERROR_INVALIDDATA;
size = 0;
while (bytes_num--)
size = size << 8 | avio_r8(pb);
}
return size;
}
static int mxf_read_sync(AVIOContext *pb, const uint8_t *key, unsigned size)
{
int i, b;
for (i = 0; i < size && !url_feof(pb); i++) {
b = avio_r8(pb);
if (b == key[0])
i = 0;
else if (b != key[i])
i = -1;
}
return i == size;
}
static int klv_read_packet(KLVPacket *klv, AVIOContext *pb)
{
if (!mxf_read_sync(pb, mxf_klv_key, 4))
return AVERROR_INVALIDDATA;
klv->offset = avio_tell(pb) - 4;
memcpy(klv->key, mxf_klv_key, 4);
avio_read(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(AVIOContext *pb, AVStream *st, AVPacket *pkt, int64_t length)
{
const uint8_t *buf_ptr, *end_ptr;
uint8_t *data_ptr;
int i;
if (length > 61444) /* worst case PAL 1920 samples 8 channels */
return AVERROR_INVALIDDATA;
length = av_get_packet(pb, pkt, length);
if (length < 0)
return length;
data_ptr = pkt->data;
end_ptr = pkt->data + length;
buf_ptr = pkt->data + 4; /* skip SMPTE 331M header */
for (; buf_ptr + st->codec->channels*4 < end_ptr; ) {
for (i = 0; i < st->codec->channels; i++) {
uint32_t sample = bytestream_get_le32(&buf_ptr);
if (st->codec->bits_per_coded_sample == 24)
bytestream_put_le24(&data_ptr, (sample >> 4) & 0xffffff);
else
bytestream_put_le16(&data_ptr, (sample >> 12) & 0xffff);
}
buf_ptr += 32 - st->codec->channels*4; // always 8 channels stored SMPTE 331M
}
av_shrink_packet(pkt, 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;
AVIOContext *pb = s->pb;
int64_t end = avio_tell(pb) + klv->length;
int64_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 AVERROR(ENOMEM);
av_aes_init(mxf->aesc, s->key, 128, 1);
}
// crypto context
avio_skip(pb, klv_decode_ber_length(pb));
// plaintext offset
klv_decode_ber_length(pb);
plaintext_size = avio_rb64(pb);
// source klv key
klv_decode_ber_length(pb);
avio_read(pb, klv->key, 16);
if (!IS_KLV_KEY(klv, mxf_essence_element_key))
return AVERROR_INVALIDDATA;
index = mxf_get_stream_index(s, klv);
if (index < 0)
return AVERROR_INVALIDDATA;
// source size
klv_decode_ber_length(pb);
orig_size = avio_rb64(pb);
if (orig_size < plaintext_size)
return AVERROR_INVALIDDATA;
// enc. code
size = klv_decode_ber_length(pb);
if (size < 32 || size - 32 < orig_size)
return AVERROR_INVALIDDATA;
avio_read(pb, ivec, 16);
avio_read(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;
size = av_get_packet(pb, pkt, size);
if (size < 0)
return size;
else if (size < plaintext_size)
return AVERROR_INVALIDDATA;
size -= plaintext_size;
if (mxf->aesc)
av_aes_crypt(mxf->aesc, &pkt->data[plaintext_size],
&pkt->data[plaintext_size], size >> 4, ivec, 1);
av_shrink_packet(pkt, orig_size);
pkt->stream_index = index;
avio_skip(pb, end - avio_tell(pb));
return 0;
}
static int mxf_read_primer_pack(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
{
MXFContext *mxf = arg;
int item_num = avio_rb32(pb);
int item_len = avio_rb32(pb);
if (item_len != 18) {
av_log_ask_for_sample(pb, "unsupported primer pack item length %d\n",
item_len);
return AVERROR_PATCHWELCOME;
}
if (item_num > UINT_MAX / item_len)
return AVERROR_INVALIDDATA;
mxf->local_tags_count = item_num;
mxf->local_tags = av_malloc(item_num*item_len);
if (!mxf->local_tags)
return AVERROR(ENOMEM);
avio_read(pb, mxf->local_tags, item_num*item_len);
return 0;
}
static int mxf_read_partition_pack(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
{
MXFContext *mxf = arg;
MXFPartition *partition, *tmp_part;
UID op;
uint64_t footer_partition;
uint32_t nb_essence_containers;
if (mxf->partitions_count+1 >= UINT_MAX / sizeof(*mxf->partitions))
return AVERROR(ENOMEM);
tmp_part = av_realloc(mxf->partitions, (mxf->partitions_count + 1) * sizeof(*mxf->partitions));
if (!tmp_part)
return AVERROR(ENOMEM);
mxf->partitions = tmp_part;
if (mxf->parsing_backward) {
/* insert the new partition pack in the middle
* this makes the entries in mxf->partitions sorted by offset */
memmove(&mxf->partitions[mxf->last_forward_partition+1],
&mxf->partitions[mxf->last_forward_partition],
(mxf->partitions_count - mxf->last_forward_partition)*sizeof(*mxf->partitions));
partition = mxf->current_partition = &mxf->partitions[mxf->last_forward_partition];
} else {
mxf->last_forward_partition++;
partition = mxf->current_partition = &mxf->partitions[mxf->partitions_count];
}
memset(partition, 0, sizeof(*partition));
mxf->partitions_count++;
partition->pack_length = avio_tell(pb) - klv_offset + size;
switch(uid[13]) {
case 2:
partition->type = Header;
break;
case 3:
partition->type = BodyPartition;
break;
case 4:
partition->type = Footer;
break;
default:
av_log(mxf->fc, AV_LOG_ERROR, "unknown partition type %i\n", uid[13]);
return AVERROR_INVALIDDATA;
}
/* consider both footers to be closed (there is only Footer and CompleteFooter) */
partition->closed = partition->type == Footer || !(uid[14] & 1);
partition->complete = uid[14] > 2;
avio_skip(pb, 4);
partition->kag_size = avio_rb32(pb);
partition->this_partition = avio_rb64(pb);
partition->previous_partition = avio_rb64(pb);
footer_partition = avio_rb64(pb);
partition->header_byte_count = avio_rb64(pb);
partition->index_byte_count = avio_rb64(pb);
partition->index_sid = avio_rb32(pb);
avio_skip(pb, 8);
partition->body_sid = avio_rb32(pb);
avio_read(pb, op, sizeof(UID));
nb_essence_containers = avio_rb32(pb);
/* some files don'thave FooterPartition set in every partition */
if (footer_partition) {
if (mxf->footer_partition && mxf->footer_partition != footer_partition) {
av_log(mxf->fc, AV_LOG_ERROR, "inconsistent FooterPartition value: %" PRIi64 " != %" PRIi64 "\n",
mxf->footer_partition, footer_partition);
} else {
mxf->footer_partition = footer_partition;
}
}
av_dlog(mxf->fc, "PartitionPack: ThisPartition = 0x%" PRIx64 ", PreviousPartition = 0x%" PRIx64 ", "
"FooterPartition = 0x%" PRIx64 ", IndexSID = %i, BodySID = %i\n",
partition->this_partition,
partition->previous_partition, footer_partition,
partition->index_sid, partition->body_sid);
/* sanity check PreviousPartition if set */
if (partition->previous_partition &&
mxf->run_in + partition->previous_partition >= klv_offset) {
av_log(mxf->fc, AV_LOG_ERROR, "PreviousPartition points to this partition or forward\n");
return AVERROR_INVALIDDATA;
}
if (op[12] == 1 && op[13] == 1) mxf->op = OP1a;
else if (op[12] == 1 && op[13] == 2) mxf->op = OP1b;
else if (op[12] == 1 && op[13] == 3) mxf->op = OP1c;
else if (op[12] == 2 && op[13] == 1) mxf->op = OP2a;
else if (op[12] == 2 && op[13] == 2) mxf->op = OP2b;
else if (op[12] == 2 && op[13] == 3) mxf->op = OP2c;
else if (op[12] == 3 && op[13] == 1) mxf->op = OP3a;
else if (op[12] == 3 && op[13] == 2) mxf->op = OP3b;
else if (op[12] == 3 && op[13] == 3) mxf->op = OP3c;
else if (op[12] == 64&& op[13] == 1) mxf->op = OPSONYOpt;
else if (op[12] == 0x10) {
/* SMPTE 390m: "There shall be exactly one essence container"
* 2011_DCPTEST_24FPS.V.mxf violates this and is frame wrapped, hence why we assume OP1a */
if (nb_essence_containers != 1) {
/* only nag once */
if (!mxf->op)
av_log(mxf->fc, AV_LOG_WARNING, "\"OPAtom\" with %u ECs - assuming OP1a\n", nb_essence_containers);
mxf->op = OP1a;
} else
mxf->op = OPAtom;
} else {
av_log(mxf->fc, AV_LOG_ERROR, "unknown operational pattern: %02xh %02xh - guessing OP1a\n", op[12], op[13]);
mxf->op = OP1a;
}
if (partition->kag_size <= 0 || partition->kag_size > (1 << 20)) {
av_log(mxf->fc, AV_LOG_WARNING, "invalid KAGSize %i - guessing ", partition->kag_size);
if (mxf->op == OPSONYOpt)
partition->kag_size = 512;
else
partition->kag_size = 1;
av_log(mxf->fc, AV_LOG_WARNING, "%i\n", partition->kag_size);
}
return 0;
}
static int mxf_add_metadata_set(MXFContext *mxf, void *metadata_set)
{
MXFMetadataSet **tmp;
if (mxf->metadata_sets_count+1 >= UINT_MAX / sizeof(*mxf->metadata_sets))
return AVERROR(ENOMEM);
tmp = av_realloc(mxf->metadata_sets, (mxf->metadata_sets_count + 1) * sizeof(*mxf->metadata_sets));
if (!tmp)
return AVERROR(ENOMEM);
mxf->metadata_sets = tmp;
mxf->metadata_sets[mxf->metadata_sets_count] = metadata_set;
mxf->metadata_sets_count++;
return 0;
}
static int mxf_read_cryptographic_context(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
{
MXFCryptoContext *cryptocontext = arg;
if (size != 16)
return AVERROR_INVALIDDATA;
if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))
avio_read(pb, cryptocontext->source_container_ul, 16);
return 0;
}
static int mxf_read_content_storage(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
{
MXFContext *mxf = arg;
switch (tag) {
case 0x1901:
mxf->packages_count = avio_rb32(pb);
if (mxf->packages_count >= UINT_MAX / sizeof(UID))
return AVERROR_INVALIDDATA;
mxf->packages_refs = av_malloc(mxf->packages_count * sizeof(UID));
if (!mxf->packages_refs)
return AVERROR(ENOMEM);
avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */
avio_read(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID));
break;
}
return 0;
}
static int mxf_read_source_clip(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
{
MXFStructuralComponent *source_clip = arg;
switch(tag) {
case 0x0202:
source_clip->duration = avio_rb64(pb);
break;
case 0x1201:
source_clip->start_position = avio_rb64(pb);
break;
case 0x1101:
/* UMID, only get last 16 bytes */
avio_skip(pb, 16);
avio_read(pb, source_clip->source_package_uid, 16);
break;
case 0x1102:
source_clip->source_track_id = avio_rb32(pb);
break;
}
return 0;
}
static int mxf_read_material_package(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
{
MXFPackage *package = arg;
switch(tag) {
case 0x4403:
package->tracks_count = avio_rb32(pb);
if (package->tracks_count >= UINT_MAX / sizeof(UID))
return AVERROR_INVALIDDATA;
package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
if (!package->tracks_refs)
return AVERROR(ENOMEM);
avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */
avio_read(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
break;
}
return 0;
}
static int mxf_read_track(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
{
MXFTrack *track = arg;
switch(tag) {
case 0x4801:
track->track_id = avio_rb32(pb);
break;
case 0x4804:
avio_read(pb, track->track_number, 4);
break;
case 0x4B01:
track->edit_rate.den = avio_rb32(pb);
track->edit_rate.num = avio_rb32(pb);
break;
case 0x4803:
avio_read(pb, track->sequence_ref, 16);
break;
}
return 0;
}
static int mxf_read_sequence(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
{
MXFSequence *sequence = arg;
switch(tag) {
case 0x0202:
sequence->duration = avio_rb64(pb);
break;
case 0x0201:
avio_read(pb, sequence->data_definition_ul, 16);
break;
case 0x1001:
sequence->structural_components_count = avio_rb32(pb);
if (sequence->structural_components_count >= UINT_MAX / sizeof(UID))
return AVERROR_INVALIDDATA;
sequence->structural_components_refs = av_malloc(sequence->structural_components_count * sizeof(UID));
if (!sequence->structural_components_refs)
return AVERROR(ENOMEM);
avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */
avio_read(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID));
break;
}
return 0;
}
static int mxf_read_source_package(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
{
MXFPackage *package = arg;
switch(tag) {
case 0x4403:
package->tracks_count = avio_rb32(pb);
if (package->tracks_count >= UINT_MAX / sizeof(UID))
return AVERROR_INVALIDDATA;
package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
if (!package->tracks_refs)
return AVERROR(ENOMEM);
avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */
avio_read(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
break;
case 0x4401:
/* UMID, only get last 16 bytes */
avio_skip(pb, 16);
avio_read(pb, package->package_uid, 16);
break;
case 0x4701:
avio_read(pb, package->descriptor_ref, 16);
break;
}
return 0;
}
static int mxf_read_index_entry_array(AVIOContext *pb, MXFIndexTableSegment *segment)
{
int i, length;
segment->nb_index_entries = avio_rb32(pb);
length = avio_rb32(pb);
if (!(segment->temporal_offset_entries=av_calloc(segment->nb_index_entries, sizeof(*segment->temporal_offset_entries))) ||
!(segment->flag_entries = av_calloc(segment->nb_index_entries, sizeof(*segment->flag_entries))) ||
!(segment->stream_offset_entries = av_calloc(segment->nb_index_entries, sizeof(*segment->stream_offset_entries))))
return AVERROR(ENOMEM);
for (i = 0; i < segment->nb_index_entries; i++) {
segment->temporal_offset_entries[i] = avio_r8(pb);
avio_r8(pb); /* KeyFrameOffset */
segment->flag_entries[i] = avio_r8(pb);
segment->stream_offset_entries[i] = avio_rb64(pb);
avio_skip(pb, length - 11);
}
return 0;
}
static int mxf_read_index_table_segment(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
{
MXFIndexTableSegment *segment = arg;
switch(tag) {
case 0x3F05:
segment->edit_unit_byte_count = avio_rb32(pb);
av_dlog(NULL, "EditUnitByteCount %d\n", segment->edit_unit_byte_count);
break;
case 0x3F06:
segment->index_sid = avio_rb32(pb);
av_dlog(NULL, "IndexSID %d\n", segment->index_sid);
break;
case 0x3F07:
segment->body_sid = avio_rb32(pb);
av_dlog(NULL, "BodySID %d\n", segment->body_sid);
break;
case 0x3F0A:
av_dlog(NULL, "IndexEntryArray found\n");
return mxf_read_index_entry_array(pb, segment);
case 0x3F0B:
segment->index_edit_rate.num = avio_rb32(pb);
segment->index_edit_rate.den = avio_rb32(pb);
av_dlog(NULL, "IndexEditRate %d/%d\n", segment->index_edit_rate.num,
segment->index_edit_rate.den);
break;
case 0x3F0C:
segment->index_start_position = avio_rb64(pb);
av_dlog(NULL, "IndexStartPosition %"PRId64"\n", segment->index_start_position);
break;
case 0x3F0D:
segment->index_duration = avio_rb64(pb);
av_dlog(NULL, "IndexDuration %"PRId64"\n", segment->index_duration);
break;
}
return 0;
}
static void mxf_read_pixel_layout(AVIOContext *pb, MXFDescriptor *descriptor)
{
int code, value, ofs = 0;
char layout[16] = {0};
do {
code = avio_r8(pb);
value = avio_r8(pb);
av_dlog(NULL, "pixel layout: code %#x\n", code);
if (ofs < 16) {
layout[ofs++] = code;
layout[ofs++] = value;
}
} while (code != 0); /* SMPTE 377M E.2.46 */
ff_mxf_decode_pixel_layout(layout, &descriptor->pix_fmt);
}
static int mxf_read_generic_descriptor(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
{
MXFDescriptor *descriptor = arg;
switch(tag) {
case 0x3F01:
descriptor->sub_descriptors_count = avio_rb32(pb);
if (descriptor->sub_descriptors_count >= UINT_MAX / sizeof(UID))
return AVERROR_INVALIDDATA;
descriptor->sub_descriptors_refs = av_malloc(descriptor->sub_descriptors_count * sizeof(UID));
if (!descriptor->sub_descriptors_refs)
return AVERROR(ENOMEM);
avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */
avio_read(pb, (uint8_t *)descriptor->sub_descriptors_refs, descriptor->sub_descriptors_count * sizeof(UID));
break;
case 0x3004:
avio_read(pb, descriptor->essence_container_ul, 16);
break;
case 0x3006:
descriptor->linked_track_id = avio_rb32(pb);
break;
case 0x3201: /* PictureEssenceCoding */
avio_read(pb, descriptor->essence_codec_ul, 16);
break;
case 0x3203:
descriptor->width = avio_rb32(pb);
break;
case 0x3202:
descriptor->height = avio_rb32(pb);
break;
case 0x320E:
descriptor->aspect_ratio.num = avio_rb32(pb);
descriptor->aspect_ratio.den = avio_rb32(pb);
break;
case 0x3D03:
descriptor->sample_rate.num = avio_rb32(pb);
descriptor->sample_rate.den = avio_rb32(pb);
break;
case 0x3D06: /* SoundEssenceCompression */
avio_read(pb, descriptor->essence_codec_ul, 16);
break;
case 0x3D07:
descriptor->channels = avio_rb32(pb);
break;
case 0x3D01:
descriptor->bits_per_sample = avio_rb32(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 + FF_INPUT_BUFFER_PADDING_SIZE);
if (!descriptor->extradata)
return AVERROR(ENOMEM);
descriptor->extradata_size = size;
avio_read(pb, descriptor->extradata, size);
}
break;
}
return 0;
}
/*
* Match an uid independently of the version byte and up to len common bytes
* Returns: boolean
*/
static int mxf_match_uid(const UID key, const UID uid, int len)
{
int i;
for (i = 0; i < len; i++) {
if (i != 7 && key[i] != uid[i])
return 0;
}
return 1;
}
static const MXFCodecUL *mxf_get_codec_ul(const MXFCodecUL *uls, UID *uid)
{
while (uls->uid[0]) {
if(mxf_match_uid(uls->uid, *uid, uls->matching_len))
break;
uls++;
}
return uls;
}
static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref, enum MXFMetadataSetType type)
{
int i;
if (!strong_ref)
return NULL;
for (i = 0; i < mxf->metadata_sets_count; i++) {
if (!memcmp(*strong_ref, mxf->metadata_sets[i]->uid, 16) &&
(type == AnyType || mxf->metadata_sets[i]->type == type)) {
return mxf->metadata_sets[i];
}
}
return NULL;
}
static const MXFCodecUL mxf_picture_essence_container_uls[] = {
// video essence container uls
{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */
{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14, CODEC_ID_DVVIDEO }, /* DV 625 25mbps */
{ { 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[] = {
// 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 */
{ { 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 */
{ { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, 0, CODEC_ID_NONE },
};
static int mxf_get_sorted_table_segments(MXFContext *mxf, int *nb_sorted_segments, MXFIndexTableSegment ***sorted_segments)
{
int i, j, nb_segments = 0;
MXFIndexTableSegment **unsorted_segments;
int last_body_sid = -1, last_index_sid = -1, last_index_start = -1;
/* count number of segments, allocate arrays and copy unsorted segments */
for (i = 0; i < mxf->metadata_sets_count; i++)
if (mxf->metadata_sets[i]->type == IndexTableSegment)
nb_segments++;
if (!(unsorted_segments = av_calloc(nb_segments, sizeof(*unsorted_segments))) ||
!(*sorted_segments = av_calloc(nb_segments, sizeof(**sorted_segments)))) {
av_freep(sorted_segments);
av_free(unsorted_segments);
return AVERROR(ENOMEM);
}
for (i = j = 0; i < mxf->metadata_sets_count; i++)
if (mxf->metadata_sets[i]->type == IndexTableSegment)
unsorted_segments[j++] = (MXFIndexTableSegment*)mxf->metadata_sets[i];
*nb_sorted_segments = 0;
/* sort segments by {BodySID, IndexSID, IndexStartPosition}, remove duplicates while we're at it */
for (i = 0; i < nb_segments; i++) {
int best = -1, best_body_sid = -1, best_index_sid = -1, best_index_start = -1;
for (j = 0; j < nb_segments; j++) {
MXFIndexTableSegment *s = unsorted_segments[j];
/* Require larger BosySID, IndexSID or IndexStartPosition then the previous entry. This removes duplicates.
* We want the smallest values for the keys than what we currently have, unless this is the first such entry this time around.
*/
if ((i == 0 || s->body_sid > last_body_sid || s->index_sid > last_index_sid || s->index_start_position > last_index_start) &&
(best == -1 || s->body_sid < best_body_sid || s->index_sid < best_index_sid || s->index_start_position < best_index_start)) {
best = j;
best_body_sid = s->body_sid;
best_index_sid = s->index_sid;
best_index_start = s->index_start_position;
}
}
/* no suitable entry found -> we're done */
if (best == -1)
break;
(*sorted_segments)[(*nb_sorted_segments)++] = unsorted_segments[best];
last_body_sid = best_body_sid;
last_index_sid = best_index_sid;
last_index_start = best_index_start;
}
av_free(unsorted_segments);
return 0;
}
/**
* Computes the absolute file offset of the given essence container offset
*/
static int mxf_absolute_bodysid_offset(MXFContext *mxf, int body_sid, int64_t offset, int64_t *offset_out)
{
int x;
int64_t offset_in = offset; /* for logging */
for (x = 0; x < mxf->partitions_count; x++) {
MXFPartition *p = &mxf->partitions[x];
if (p->body_sid != body_sid)
continue;
if (offset < p->essence_length || !p->essence_length) {
*offset_out = p->essence_offset + offset;
return 0;
}
offset -= p->essence_length;
}
av_log(mxf->fc, AV_LOG_ERROR, "failed to find absolute offset of %" PRIx64" in BodySID %i - partial file?\n",
offset_in, body_sid);
return AVERROR_INVALIDDATA;
}
/**
* Returns the end position of the essence container with given BodySID, or zero if unknown
*/
static int64_t mxf_essence_container_end(MXFContext *mxf, int body_sid)
{
int x;
int64_t ret = 0;
for (x = 0; x < mxf->partitions_count; x++) {
MXFPartition *p = &mxf->partitions[x];
if (p->body_sid != body_sid)
continue;
if (!p->essence_length)
return 0;
ret = p->essence_offset + p->essence_length;
}
return ret;
}
/* EditUnit -> absolute offset */
static int mxf_edit_unit_absolute_offset(MXFContext *mxf, MXFIndexTable *index_table, int64_t edit_unit, int64_t *edit_unit_out, int64_t *offset_out, int nag)
{
int i;
int64_t offset_temp = 0;
for (i = 0; i < index_table->nb_segments; i++) {
MXFIndexTableSegment *s = index_table->segments[i];
edit_unit = FFMAX(edit_unit, s->index_start_position); /* clamp if trying to seek before start */
if (edit_unit < s->index_start_position + s->index_duration) {
int64_t index = edit_unit - s->index_start_position;
if (s->edit_unit_byte_count)
offset_temp += s->edit_unit_byte_count * index;
else if (s->nb_index_entries) {
if (s->nb_index_entries == 2 * s->index_duration + 1)
index *= 2; /* Avid index */
if (index < 0 || index > s->nb_index_entries) {
av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" IndexEntryArray too small\n",
index_table->index_sid, s->index_start_position);
return AVERROR_INVALIDDATA;
}
offset_temp = s->stream_offset_entries[index];
} else {
av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" missing EditUnitByteCount and IndexEntryArray\n",
index_table->index_sid, s->index_start_position);
return AVERROR_INVALIDDATA;
}
if (edit_unit_out)
*edit_unit_out = edit_unit;
return mxf_absolute_bodysid_offset(mxf, index_table->body_sid, offset_temp, offset_out);
} else {
/* EditUnitByteCount == 0 for VBR indexes, which is fine since they use explicit StreamOffsets */
offset_temp += s->edit_unit_byte_count * s->index_duration;
}
}
if (nag)
av_log(mxf->fc, AV_LOG_ERROR, "failed to map EditUnit %"PRId64" in IndexSID %i to an offset\n", edit_unit, index_table->index_sid);
return AVERROR_INVALIDDATA;
}
static int mxf_compute_ptses_fake_index(MXFContext *mxf, MXFIndexTable *index_table)
{
int i, j, x;
int8_t max_temporal_offset = -128;
/* first compute how many entries we have */
for (i = 0; i < index_table->nb_segments; i++) {
MXFIndexTableSegment *s = index_table->segments[i];
if (!s->nb_index_entries) {
index_table->nb_ptses = 0;
return 0; /* no TemporalOffsets */
}
index_table->nb_ptses += s->index_duration;
}
/* paranoid check */
if (index_table->nb_ptses <= 0)
return 0;
if (!(index_table->ptses = av_calloc(index_table->nb_ptses, sizeof(int64_t))) ||
!(index_table->fake_index = av_calloc(index_table->nb_ptses, sizeof(AVIndexEntry)))) {
av_freep(&index_table->ptses);
return AVERROR(ENOMEM);
}
/* we may have a few bad TemporalOffsets
* make sure the corresponding PTSes don't have the bogus value 0 */
for (x = 0; x < index_table->nb_ptses; x++)
index_table->ptses[x] = AV_NOPTS_VALUE;
/**
* We have this:
*
* x TemporalOffset
* 0: 0
* 1: 1
* 2: 1
* 3: -2
* 4: 1
* 5: 1
* 6: -2
*
* We want to transform it into this:
*
* x DTS PTS
* 0: -1 0
* 1: 0 3
* 2: 1 1
* 3: 2 2
* 4: 3 6
* 5: 4 4
* 6: 5 5
*
* We do this by bucket sorting x by x+TemporalOffset[x] into mxf->ptses,
* then settings mxf->first_dts = -max(TemporalOffset[x]).
* The latter makes DTS <= PTS.
*/
for (i = x = 0; i < index_table->nb_segments; i++) {
MXFIndexTableSegment *s = index_table->segments[i];
int index_delta = 1;
int n = s->nb_index_entries;
if (s->nb_index_entries == 2 * s->index_duration + 1) {
index_delta = 2; /* Avid index */
/* ignore the last entry - it's the size of the essence container */
n--;
}
for (j = 0; j < n; j += index_delta, x++) {
int offset = s->temporal_offset_entries[j] / index_delta;
int index = x + offset;
if (x >= index_table->nb_ptses) {
av_log(mxf->fc, AV_LOG_ERROR, "x >= nb_ptses - IndexEntryCount %i < IndexDuration %"PRId64"?\n",
s->nb_index_entries, s->index_duration);
break;
}
index_table->fake_index[x].timestamp = x;
index_table->fake_index[x].flags = !(s->flag_entries[j] & 0x30) ? AVINDEX_KEYFRAME : 0;
if (index < 0 || index >= index_table->nb_ptses) {
av_log(mxf->fc, AV_LOG_ERROR,
"index entry %i + TemporalOffset %i = %i, which is out of bounds\n",
x, offset, index);
continue;
}
index_table->ptses[index] = x;
max_temporal_offset = FFMAX(max_temporal_offset, offset);
}
}
index_table->first_dts = -max_temporal_offset;
return 0;
}
/**
* Sorts and collects index table segments into index tables.
* Also computes PTSes if possible.
*/
static int mxf_compute_index_tables(MXFContext *mxf)
{
int i, j, k, ret, nb_sorted_segments;
MXFIndexTableSegment **sorted_segments = NULL;
if ((ret = mxf_get_sorted_table_segments(mxf, &nb_sorted_segments, &sorted_segments)) ||
nb_sorted_segments <= 0) {
av_log(mxf->fc, AV_LOG_WARNING, "broken or empty index\n");
return 0;
}
/* sanity check and count unique BodySIDs/IndexSIDs */
for (i = 0; i < nb_sorted_segments; i++) {
if (i == 0 || sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid)
mxf->nb_index_tables++;
else if (sorted_segments[i-1]->body_sid != sorted_segments[i]->body_sid) {
av_log(mxf->fc, AV_LOG_ERROR, "found inconsistent BodySID\n");
ret = AVERROR_INVALIDDATA;
goto finish_decoding_index;
}
}
if (!(mxf->index_tables = av_calloc(mxf->nb_index_tables, sizeof(MXFIndexTable)))) {
av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate index tables\n");
ret = AVERROR(ENOMEM);
goto finish_decoding_index;
}
/* distribute sorted segments to index tables */
for (i = j = 0; i < nb_sorted_segments; i++) {
if (i != 0 && sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid) {
/* next IndexSID */
j++;
}
mxf->index_tables[j].nb_segments++;
}
for (i = j = 0; j < mxf->nb_index_tables; i += mxf->index_tables[j++].nb_segments) {
MXFIndexTable *t = &mxf->index_tables[j];
if (!(t->segments = av_calloc(t->nb_segments, sizeof(MXFIndexTableSegment*)))) {
av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate IndexTableSegment pointer array\n");
ret = AVERROR(ENOMEM);
goto finish_decoding_index;
}
if (sorted_segments[i]->index_start_position)
av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i starts at EditUnit %"PRId64" - seeking may not work as expected\n",
sorted_segments[i]->index_sid, sorted_segments[i]->index_start_position);
memcpy(t->segments, &sorted_segments[i], t->nb_segments * sizeof(MXFIndexTableSegment*));
t->index_sid = sorted_segments[i]->index_sid;
t->body_sid = sorted_segments[i]->body_sid;
if ((ret = mxf_compute_ptses_fake_index(mxf, t)) < 0)
goto finish_decoding_index;
/* fix zero IndexDurations */
for (k = 0; k < t->nb_segments; k++) {
if (t->segments[k]->index_duration)
continue;
if (t->nb_segments > 1)
av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i segment %i has zero IndexDuration and there's more than one segment\n",
t->index_sid, k);
if (mxf->fc->nb_streams <= 0) {
av_log(mxf->fc, AV_LOG_WARNING, "no streams?\n");
break;
}
/* assume the first stream's duration is reasonable
* leave index_duration = 0 on further segments in case we have any (unlikely)
*/
t->segments[k]->index_duration = mxf->fc->streams[0]->duration;
break;
}
}
ret = 0;
finish_decoding_index:
av_free(sorted_segments);
return ret;
}
static int mxf_parse_structural_metadata(MXFContext *mxf)
{
MXFPackage *material_package = NULL;
MXFPackage *temp_package = NULL;
int i, j, k, ret;
av_dlog(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 AVERROR_INVALIDDATA;
}
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");
continue;
}
/* 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_dlog(mxf->fc, "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");
ret = AVERROR_INVALIDDATA;
goto fail_and_free;
}
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 || !component)
continue;
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");
ret = AVERROR_INVALIDDATA;
goto fail_and_free;
}
/* 0001GL00.MXF.A1.mxf_opatom.mxf has the same SourcePackageID as 0001GL.MXF.V1.mxf_opatom.mxf
* This would result in both files appearing to have two streams. Work around this by sanity checking DataDefinition */
if (memcmp(material_track->sequence->data_definition_ul, source_track->sequence->data_definition_ul, 16)) {
av_log(mxf->fc, AV_LOG_ERROR, "material track %d: DataDefinition mismatch\n", material_track->track_id);
continue;
}
st = avformat_new_stream(mxf->fc, NULL);
if (!st) {
av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");
ret = AVERROR(ENOMEM);
goto fail_and_free;
}
st->id = source_track->track_id;
st->priv_data = source_track;
st->duration = component->duration;
if (st->duration == -1)
st->duration = AV_NOPTS_VALUE;
st->start_time = component->start_position;
avpriv_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);
PRINT_KEY(mxf->fc, "data definition ul", source_track->sequence->data_definition_ul);
codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);
st->codec->codec_type = codec_ul->id;
source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);
if (source_package->descriptor) {
if (source_package->descriptor->type == MultipleDescriptor) {
for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {
MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);
if (!sub_descriptor) {
av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");
continue;
}
if (sub_descriptor->linked_track_id == source_track->track_id) {
descriptor = sub_descriptor;
break;
}
}
} else if (source_package->descriptor->type == Descriptor)
descriptor = source_package->descriptor;
}
if (!descriptor) {
av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);
continue;
}
PRINT_KEY(mxf->fc, "essence codec ul", descriptor->essence_codec_ul);
PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);
essence_container_ul = &descriptor->essence_container_ul;
/* HACK: replacing the original key with mxf_encrypted_essence_container
* is not allowed according to s429-6, try to find correct information anyway */
if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {
av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");
for (k = 0; k < mxf->metadata_sets_count; k++) {
MXFMetadataSet *metadata = mxf->metadata_sets[k];
if (metadata->type == CryptoContext) {
essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;
break;
}
}
}
/* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */
codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);
st->codec->codec_id = codec_ul->id;
if (descriptor->extradata) {
st->codec->extradata = descriptor->extradata;
st->codec->extradata_size = descriptor->extradata_size;
}
if (st->codec->codec_type == AVMEDIA_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;
if (st->codec->codec_id == CODEC_ID_RAWVIDEO)
st->codec->pix_fmt = descriptor->pix_fmt;
st->need_parsing = AVSTREAM_PARSE_HEADERS;
} else if (st->codec->codec_type == AVMEDIA_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_coded_sample = descriptor->bits_per_sample;
if (descriptor->sample_rate.den > 0)
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 > 16 && 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 > 16 && 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 != AVMEDIA_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {
/* TODO: decode timestamps */
st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
}
}
ret = 0;
fail_and_free:
return ret;
}
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,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }, mxf_read_partition_pack },
{ { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x02,0x00 }, mxf_read_partition_pack },
{ { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x03,0x00 }, mxf_read_partition_pack },
{ { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }, mxf_read_partition_pack },
{ { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x01,0x00 }, mxf_read_partition_pack },
{ { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x02,0x00 }, mxf_read_partition_pack },
{ { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x03,0x00 }, mxf_read_partition_pack },
{ { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }, mxf_read_partition_pack },
{ { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x02,0x00 }, mxf_read_partition_pack },
{ { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }, mxf_read_partition_pack },
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Generic Sound */
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* MPEG 2 Video */
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },
{ { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },
{ { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },
};
static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadFunc *read_child, int ctx_size, enum MXFMetadataSetType type)
{
AVIOContext *pb = mxf->fc->pb;
MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;
uint64_t klv_end = avio_tell(pb) + klv->length;
if (!ctx)
return AVERROR(ENOMEM);
while (avio_tell(pb) + 4 < klv_end && !url_feof(pb)) {
int ret;
int tag = avio_rb16(pb);
int size = avio_rb16(pb); /* KLV specified by 0x53 */
uint64_t next = avio_tell(pb) + size;
UID uid = {0};
av_dlog(mxf->fc, "local tag %#04x size %d\n", tag, size);
if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */
av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);
continue;
}
if (tag > 0x7FFF) { /* dynamic tag */
int i;
for (i = 0; i < mxf->local_tags_count; i++) {
int local_tag = AV_RB16(mxf->local_tags+i*18);
if (local_tag == tag) {
memcpy(uid, mxf->local_tags+i*18+2, 16);
av_dlog(mxf->fc, "local tag %#04x\n", local_tag);
PRINT_KEY(mxf->fc, "uid", uid);
}
}
}
if (ctx_size && tag == 0x3C0A)
avio_read(pb, ctx->uid, 16);
else if ((ret = read_child(ctx, pb, tag, size, uid, -1)) < 0)
return ret;
/* accept the 64k local set limit being exceeded (Avid)
* don't accept it extending past the end of the KLV though (zzuf5.mxf) */
if (avio_tell(pb) > klv_end) {
av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x extends past end of local set @ %#"PRIx64"\n",
tag, klv->offset);
return AVERROR_INVALIDDATA;
} else if (avio_tell(pb) <= next) /* only seek forward, else this can loop for a long time */
avio_seek(pb, next, SEEK_SET);
}
if (ctx_size) ctx->type = type;
return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;
}
/**
* Seeks to the previous partition, if possible
* @return <= 0 if we should stop parsing, > 0 if we should keep going
*/
static int mxf_seek_to_previous_partition(MXFContext *mxf)
{
AVIOContext *pb = mxf->fc->pb;
if (!mxf->current_partition ||
mxf->run_in + mxf->current_partition->previous_partition <= mxf->last_forward_tell)
return 0; /* we've parsed all partitions */
/* seek to previous partition */
avio_seek(pb, mxf->run_in + mxf->current_partition->previous_partition, SEEK_SET);
mxf->current_partition = NULL;
av_dlog(mxf->fc, "seeking to previous partition\n");
return 1;
}
/**
* Called when essence is encountered
* @return <= 0 if we should stop parsing, > 0 if we should keep going
*/
static int mxf_parse_handle_essence(MXFContext *mxf)
{
AVIOContext *pb = mxf->fc->pb;
int64_t ret;
if (mxf->parsing_backward) {
return mxf_seek_to_previous_partition(mxf);
} else {
if (!mxf->footer_partition) {
av_dlog(mxf->fc, "no footer\n");
return 0;
}
av_dlog(mxf->fc, "seeking to footer\n");
/* remember where we were so we don't end up seeking further back than this */
mxf->last_forward_tell = avio_tell(pb);
if (!pb->seekable) {
av_log(mxf->fc, AV_LOG_INFO, "file is not seekable - not parsing footer\n");
return -1;
}
/* seek to footer partition and parse backward */
if ((ret = avio_seek(pb, mxf->run_in + mxf->footer_partition, SEEK_SET)) < 0) {
av_log(mxf->fc, AV_LOG_ERROR, "failed to seek to footer @ 0x%"PRIx64" (%"PRId64") - partial file?\n",
mxf->run_in + mxf->footer_partition, ret);
return ret;
}
mxf->current_partition = NULL;
mxf->parsing_backward = 1;
}
return 1;
}
/**
* Called when the next partition or EOF is encountered
* @return <= 0 if we should stop parsing, > 0 if we should keep going
*/
static int mxf_parse_handle_partition_or_eof(MXFContext *mxf)
{
return mxf->parsing_backward ? mxf_seek_to_previous_partition(mxf) : 1;
}
/**
* Figures out the proper offset and length of the essence container in each partition
*/
static void mxf_compute_essence_containers(MXFContext *mxf)
{
int x;
/* everything is already correct */
if (mxf->op == OPAtom)
return;
for (x = 0; x < mxf->partitions_count; x++) {
MXFPartition *p = &mxf->partitions[x];
if (!p->body_sid)
continue; /* BodySID == 0 -> no essence */
if (x >= mxf->partitions_count - 1)
break; /* last partition - can't compute length (and we don't need to) */
/* essence container spans to the next partition */
p->essence_length = mxf->partitions[x+1].this_partition - p->essence_offset;
if (p->essence_length < 0) {
/* next ThisPartition < essence_offset */
p->essence_length = 0;
av_log(mxf->fc, AV_LOG_ERROR, "partition %i: bad ThisPartition = %" PRIx64 "\n",
x+1, mxf->partitions[x+1].this_partition);
}
}
}
static int64_t round_to_kag(int64_t position, int kag_size)
{
/* TODO: account for run-in? the spec isn't clear whether KAG should account for it */
/* NOTE: kag_size may be any integer between 1 - 2^10 */
int64_t ret = (position / kag_size) * kag_size;
return ret == position ? ret : ret + kag_size;
}
static int is_pcm(enum CodecID codec_id)
{
/* we only care about "normal" PCM codecs until we get samples */
return codec_id >= CODEC_ID_PCM_S16LE && codec_id < CODEC_ID_PCM_S24DAUD;
}
/**
* Deals with the case where for some audio atoms EditUnitByteCount is very small (2, 4..).
* In those cases we should read more than one sample per call to mxf_read_packet().
*/
static void mxf_handle_small_eubc(AVFormatContext *s)
{
MXFContext *mxf = s->priv_data;
/* assuming non-OPAtom == frame wrapped
* no sane writer would wrap 2 byte PCM packets with 20 byte headers.. */
if (mxf->op != OPAtom)
return;
/* expect PCM with exactly one index table segment and a small (< 32) EUBC */
if (s->nb_streams != 1 || s->streams[0]->codec->codec_type != AVMEDIA_TYPE_AUDIO ||
!is_pcm(s->streams[0]->codec->codec_id) || mxf->nb_index_tables != 1 ||
mxf->index_tables[0].nb_segments != 1 ||
mxf->index_tables[0].segments[0]->edit_unit_byte_count >= 32)
return;
/* arbitrarily default to 48 kHz PAL audio frame size */
/* TODO: we could compute this from the ratio between the audio and video edit rates
* for 48 kHz NTSC we could use the 1802-1802-1802-1802-1801 pattern */
mxf->edit_units_per_packet = 1920;
}
static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
MXFContext *mxf = s->priv_data;
KLVPacket klv;
int64_t essence_offset = 0;
int ret;
mxf->last_forward_tell = INT64_MAX;
mxf->edit_units_per_packet = 1;
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 AVERROR_INVALIDDATA;
}
avio_seek(s->pb, -14, SEEK_CUR);
mxf->fc = s;
mxf->run_in = avio_tell(s->pb);
while (!url_feof(s->pb)) {
const MXFMetadataReadTableEntry *metadata;
if (klv_read_packet(&klv, s->pb) < 0) {
/* EOF - seek to previous partition or stop */
if(mxf_parse_handle_partition_or_eof(mxf) <= 0)
break;
else
continue;
}
PRINT_KEY(s, "read header", klv.key);
av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);
if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||
IS_KLV_KEY(klv.key, mxf_essence_element_key) ||
IS_KLV_KEY(klv.key, mxf_avid_essence_element_key) ||
IS_KLV_KEY(klv.key, mxf_system_item_key)) {
if (!mxf->current_partition) {
av_log(mxf->fc, AV_LOG_ERROR, "found essence prior to first PartitionPack\n");
return AVERROR_INVALIDDATA;
}
if (!mxf->current_partition->essence_offset) {
/* for OP1a we compute essence_offset
* for OPAtom we point essence_offset after the KL (usually op1a_essence_offset + 20 or 25)
* TODO: for OP1a we could eliminate this entire if statement, always stopping parsing at op1a_essence_offset
* for OPAtom we still need the actual essence_offset though (the KL's length can vary)
*/
int64_t op1a_essence_offset =
round_to_kag(mxf->current_partition->this_partition +
mxf->current_partition->pack_length, mxf->current_partition->kag_size) +
round_to_kag(mxf->current_partition->header_byte_count, mxf->current_partition->kag_size) +
round_to_kag(mxf->current_partition->index_byte_count, mxf->current_partition->kag_size);
if (mxf->op == OPAtom) {
/* point essence_offset to the actual data
* OPAtom has all the essence in one big KLV
*/
mxf->current_partition->essence_offset = avio_tell(s->pb);
mxf->current_partition->essence_length = klv.length;
} else {
/* NOTE: op1a_essence_offset may be less than to klv.offset (C0023S01.mxf) */
mxf->current_partition->essence_offset = op1a_essence_offset;
}
}
if (!essence_offset)
essence_offset = klv.offset;
/* seek to footer, previous partition or stop */
if (mxf_parse_handle_essence(mxf) <= 0)
break;
continue;
} else if (!memcmp(klv.key, mxf_header_partition_pack_key, 13) &&
klv.key[13] >= 2 && klv.key[13] <= 4 && mxf->current_partition) {
/* next partition pack - keep going, seek to previous partition or stop */
if(mxf_parse_handle_partition_or_eof(mxf) <= 0)
break;
}
for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {
if (IS_KLV_KEY(klv.key, metadata->key)) {
int res;
if (klv.key[5] == 0x53) {
res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);
} else {
uint64_t next = avio_tell(s->pb) + klv.length;
res = metadata->read(mxf, s->pb, 0, klv.length, klv.key, klv.offset);
/* only seek forward, else this can loop for a long time */
if (avio_tell(s->pb) > next) {
av_log(s, AV_LOG_ERROR, "read past end of KLV @ %#"PRIx64"\n",
klv.offset);
return AVERROR_INVALIDDATA;
}
avio_seek(s->pb, next, SEEK_SET);
}
if (res < 0) {
av_log(s, AV_LOG_ERROR, "error reading header metadata\n");
return res;
}
break;
}
}
if (!metadata->read)
avio_skip(s->pb, klv.length);
}
/* FIXME avoid seek */
if (!essence_offset) {
av_log(s, AV_LOG_ERROR, "no essence\n");
return AVERROR_INVALIDDATA;
}
avio_seek(s->pb, essence_offset, SEEK_SET);
mxf_compute_essence_containers(mxf);
/* we need to do this before computing the index tables
* to be able to fill in zero IndexDurations with st->duration */
if ((ret = mxf_parse_structural_metadata(mxf)) < 0)
return ret;
if ((ret = mxf_compute_index_tables(mxf)) < 0)
return ret;
if (mxf->nb_index_tables > 1) {
/* TODO: look up which IndexSID to use via EssenceContainerData */
av_log(mxf->fc, AV_LOG_INFO, "got %i index tables - only the first one (IndexSID %i) will be used\n",
mxf->nb_index_tables, mxf->index_tables[0].index_sid);
} else if (mxf->nb_index_tables == 0 && mxf->op == OPAtom) {
av_log(mxf->fc, AV_LOG_ERROR, "cannot demux OPAtom without an index\n");
return AVERROR_INVALIDDATA;
}
mxf_handle_small_eubc(s);
return 0;
}
/**
* Computes DTS and PTS for the given video packet based on its offset.
*/
static void mxf_packet_timestamps(MXFContext *mxf, AVPacket *pkt)
{
int64_t last_ofs = -1, next_ofs;
MXFIndexTable *t = &mxf->index_tables[0];
/* this is called from the OP1a demuxing logic, which means there may be no index tables */
if (mxf->nb_index_tables <= 0)
return;
/* find mxf->current_edit_unit so that the next edit unit starts ahead of pkt->pos */
while (mxf->current_edit_unit >= 0) {
if (mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + 1, NULL, &next_ofs, 0) < 0)
break;
if (next_ofs <= last_ofs) {
/* large next_ofs didn't change or current_edit_unit wrapped around
* this fixes the infinite loop on zzuf3.mxf */
av_log(mxf->fc, AV_LOG_ERROR, "next_ofs didn't change. not deriving packet timestamps\n");
return;
}
if (next_ofs > pkt->pos)
break;
last_ofs = next_ofs;
mxf->current_edit_unit++;
}
if (mxf->current_edit_unit < 0 || mxf->current_edit_unit >= t->nb_ptses)
return;
pkt->dts = mxf->current_edit_unit + t->first_dts;
pkt->pts = t->ptses[mxf->current_edit_unit];
}
static int mxf_read_packet_old(AVFormatContext *s, AVPacket *pkt)
{
KLVPacket klv;
while (!url_feof(s->pb)) {
int ret;
if (klv_read_packet(&klv, s->pb) < 0)
return -1;
PRINT_KEY(s, "read packet", klv.key);
av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);
if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {
ret = mxf_decrypt_triplet(s, pkt, &klv);
if (ret < 0) {
av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");
return AVERROR_INVALIDDATA;
}
return 0;
}
if (IS_KLV_KEY(klv.key, mxf_essence_element_key) ||
IS_KLV_KEY(klv.key, mxf_avid_essence_element_key)) {
int index = mxf_get_stream_index(s, &klv);
if (index < 0) {
av_log(s, AV_LOG_ERROR, "error getting stream index %d\n", AV_RB32(klv.key+12));
goto skip;
}
if (s->streams[index]->discard == AVDISCARD_ALL)
goto skip;
/* check for 8 channels AES3 element */
if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {
if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) {
av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");
return AVERROR_INVALIDDATA;
}
} else {
ret = av_get_packet(s->pb, pkt, klv.length);
if (ret < 0)
return ret;
}
pkt->stream_index = index;
pkt->pos = klv.offset;
if (s->streams[index]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
mxf_packet_timestamps(s->priv_data, pkt); /* offset -> EditUnit -> DTS/PTS */
return 0;
} else
skip:
avio_skip(s->pb, klv.length);
}
return AVERROR_EOF;
}
static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)
{
MXFContext *mxf = s->priv_data;
int ret, size;
int64_t ret64, pos, next_pos;
AVStream *st;
MXFIndexTable *t;
int edit_units;
if (mxf->op != OPAtom)
return mxf_read_packet_old(s, pkt);
/* OPAtom - clip wrapped demuxing */
/* NOTE: mxf_read_header() makes sure nb_index_tables > 0 for OPAtom */
st = s->streams[0];
t = &mxf->index_tables[0];
if (mxf->current_edit_unit >= st->duration)
return AVERROR_EOF;
edit_units = FFMIN(mxf->edit_units_per_packet, st->duration - mxf->current_edit_unit);
if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit, NULL, &pos, 1)) < 0)
return ret;
/* compute size by finding the next edit unit or the end of the essence container
* not pretty, but it works */
if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + edit_units, NULL, &next_pos, 0)) < 0 &&
(next_pos = mxf_essence_container_end(mxf, t->body_sid)) <= 0) {
av_log(s, AV_LOG_ERROR, "unable to compute the size of the last packet\n");
return AVERROR_INVALIDDATA;
}
if ((size = next_pos - pos) <= 0) {
av_log(s, AV_LOG_ERROR, "bad size: %i\n", size);
return AVERROR_INVALIDDATA;
}
if ((ret64 = avio_seek(s->pb, pos, SEEK_SET)) < 0)
return ret64;
if ((ret = av_get_packet(s->pb, pkt, size)) != size)
return ret < 0 ? ret : AVERROR_EOF;
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && t->ptses &&
mxf->current_edit_unit >= 0 && mxf->current_edit_unit < t->nb_ptses) {
pkt->dts = mxf->current_edit_unit + t->first_dts;
pkt->pts = t->ptses[mxf->current_edit_unit];
}
pkt->stream_index = 0;
mxf->current_edit_unit += edit_units;
return 0;
}
static int mxf_read_close(AVFormatContext *s)
{
MXFContext *mxf = s->priv_data;
MXFIndexTableSegment *seg;
int i;
av_freep(&mxf->packages_refs);
for (i = 0; i < s->nb_streams; i++)
s->streams[i]->priv_data = NULL;
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 IndexTableSegment:
seg = (MXFIndexTableSegment *)mxf->metadata_sets[i];
av_freep(&seg->temporal_offset_entries);
av_freep(&seg->flag_entries);
av_freep(&seg->stream_offset_entries);
break;
default:
break;
}
av_freep(&mxf->metadata_sets[i]);
}
av_freep(&mxf->partitions);
av_freep(&mxf->metadata_sets);
av_freep(&mxf->aesc);
av_freep(&mxf->local_tags);
for (i = 0; i < mxf->nb_index_tables; i++) {
av_freep(&mxf->index_tables[i].segments);
av_freep(&mxf->index_tables[i].ptses);
av_freep(&mxf->index_tables[i].fake_index);
}
av_freep(&mxf->index_tables);
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;
MXFContext* mxf = s->priv_data;
int64_t seekpos;
int ret;
MXFIndexTable *t;
if (mxf->index_tables <= 0) {
if (!s->bit_rate)
return AVERROR_INVALIDDATA;
if (sample_time < 0)
sample_time = 0;
seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);
if ((ret = avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET)) < 0)
return ret;
ff_update_cur_dts(s, st, sample_time);
} else {
t = &mxf->index_tables[0];
/* clamp above zero, else ff_index_search_timestamp() returns negative
* this also means we allow seeking before the start */
sample_time = FFMAX(sample_time, 0);
if (t->fake_index) {
/* behave as if we have a proper index */
if ((sample_time = ff_index_search_timestamp(t->fake_index, t->nb_ptses, sample_time, flags)) < 0)
return sample_time;
} else {
/* no IndexEntryArray (one or more CBR segments)
* make sure we don't seek past the end */
sample_time = FFMIN(sample_time, st->duration - 1);
}
if ((ret = mxf_edit_unit_absolute_offset(mxf, t, sample_time, &sample_time, &seekpos, 1)) << 0)
return ret;
ff_update_cur_dts(s, st, sample_time);
mxf->current_edit_unit = sample_time;
avio_seek(s->pb, seekpos, SEEK_SET);
}
return 0;
}
AVInputFormat ff_mxf_demuxer = {
.name = "mxf",
.long_name = NULL_IF_CONFIG_SMALL("Material eXchange Format"),
.priv_data_size = sizeof(MXFContext),
.read_probe = mxf_probe,
.read_header = mxf_read_header,
.read_packet = mxf_read_packet,
.read_close = mxf_read_close,
.read_seek = mxf_read_seek,
};
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