int mxf_read_next_nonfiller_kl(MXFFile *mxfFile, mxfKey *key, uint8_t *llen, uint64_t *len)
{
mxfKey tkey;
uint8_t tllen;
uint64_t tlen;
CHK_ORET(mxf_read_kl(mxfFile, &tkey, &tllen, &tlen));
while (mxf_is_filler(&tkey))
{
CHK_ORET(mxf_skip(mxfFile, (int64_t)tlen));
CHK_ORET(mxf_read_kl(mxfFile, &tkey, &tllen, &tlen));
}
*key = tkey;
*llen = tllen;
*len = tlen;
return 1;
}
int mxf_read_and_return_set(MXFFile* mxfFile, const mxfKey* key, uint64_t len,
MXFHeaderMetadata* headerMetadata, int addToHeaderMetadata, MXFMetadataSet** set)
{
MXFMetadataSet* newSet = NULL;
MXFSetDef* setDef = NULL;
uint64_t totalLen = 0;
mxfLocalTag itemTag;
uint16_t itemLen;
int haveInstanceUID = 0;
mxfKey itemKey;
MXFItemDef* itemDef = NULL;
MXFMetadataItem* newItem;
assert(headerMetadata->primerPack != NULL);
/* only read sets with known definitions */
if (mxf_find_set_def(headerMetadata->dataModel, key, &setDef))
{
CHK_ORET(create_empty_set(key, &newSet));
/* read each item in the set*/
haveInstanceUID = 0;
do
{
CHK_OFAIL(mxf_read_item_tl(mxfFile, &itemTag, &itemLen));
/* check the item tag is registered in the primer */
if (mxf_get_item_key(headerMetadata->primerPack, itemTag, &itemKey))
{
/* only read items with known definition */
if (mxf_find_item_def_in_set_def(&itemKey, setDef, &itemDef))
{
CHK_OFAIL(mxf_create_item(newSet, &itemKey, itemTag, &newItem));
newItem->isPersistent = 1;
CHK_OFAIL(mxf_read_item(mxfFile, newItem, itemLen));
if (mxf_equals_key(&MXF_ITEM_K(InterchangeObject, InstanceUID), &itemKey))
{
mxf_get_uuid(newItem->value, &newSet->instanceUID);
haveInstanceUID = 1;
}
}
/* skip items with unknown definition */
else
{
CHK_OFAIL(mxf_skip(mxfFile, (int64_t)itemLen));
}
}
/* skip items not registered in the primer. Log warning because the file is invalid */
else
{
mxf_log_warn("Encountered item with tag %d not registered in the primer" LOG_LOC_FORMAT,
itemTag, LOG_LOC_PARAMS);
CHK_OFAIL(mxf_skip(mxfFile, (int64_t)itemLen));
}
totalLen += 4 + itemLen;
}
while (totalLen < len);
if (totalLen != len)
{
mxf_log_error("Incorrect metadata set length encountered" LOG_LOC_FORMAT, LOG_LOC_PARAMS);
goto fail;
}
if (!haveInstanceUID)
{
mxf_log_error("Metadata set does not have InstanceUID item" LOG_LOC_FORMAT, LOG_LOC_PARAMS);
goto fail;
}
/* ok to add set */
if (addToHeaderMetadata)
{
CHK_OFAIL(mxf_add_set(headerMetadata, newSet));
}
*set = newSet;
return 1;
}
/* skip the set if the def is unknown */
CHK_ORET(mxf_skip(mxfFile, (int64_t)len));
*set = NULL;
return 2;
fail:
mxf_free_set(&newSet);
return 0;
}
/* Read primer pack followed by sets. The inputs pkey, pllen, plen must
correspond to that for the primer pack */
int mxf_read_filtered_header_metadata(MXFFile* mxfFile, MXFReadFilter* filter,
MXFHeaderMetadata* headerMetadata, uint64_t headerByteCount,
const mxfKey* pkey, uint8_t pllen, uint64_t plen)
{
mxfKey key;
uint8_t llen;
uint64_t len;
int skip = 0;
MXFMetadataSet* newSet = NULL;
uint64_t count = 0;
int result;
CHK_ORET(headerByteCount != 0);
/* check that input pkey is as expected, and assume pllen and plen are also ok */
CHK_ORET(mxf_is_primer_pack(pkey));
count += mxfKey_extlen + pllen;
if (headerMetadata->primerPack != NULL)
{
mxf_free_primer_pack(&headerMetadata->primerPack);
}
CHK_ORET(mxf_read_primer_pack(mxfFile, &headerMetadata->primerPack));
count += plen;
while (count < headerByteCount)
{
CHK_ORET(mxf_read_kl(mxfFile, &key, &llen, &len));
count += mxfKey_extlen + llen;
if (mxf_is_filler(&key))
{
CHK_ORET(mxf_skip(mxfFile, len));
}
else
{
if (filter != NULL)
{
/* signal before read */
skip = 0;
if (filter->before_set_read != NULL)
{
CHK_ORET(filter->before_set_read(filter->privateData, headerMetadata, &key, llen, len, &skip));
}
if (!skip)
{
CHK_ORET((result = mxf_read_and_return_set(mxfFile, &key, len, headerMetadata, 0, &newSet)) > 0);
if (result == 1) /* set was read and returned in "set" parameter */
{
/* signal after read */
skip = 0;
if (filter->after_set_read != NULL)
{
CHK_OFAIL(filter->after_set_read(filter->privateData, headerMetadata, newSet, &skip));
}
if (!skip)
{
CHK_OFAIL(mxf_add_set(headerMetadata, newSet));
}
else
{
mxf_free_set(&newSet);
}
}
}
else
{
CHK_ORET(mxf_skip(mxfFile, len));
}
}
else
{
CHK_ORET(mxf_read_set(mxfFile, &key, len, headerMetadata, 1) > 0);
}
}
count += len;
}
CHK_ORET(count == headerByteCount);
return 1;
fail:
mxf_free_set(&newSet);
return 0;
}
static int ns_read_content_package(MXFReader *reader, int skip, MXFReaderListener *listener)
{
MXFFile *mxfFile = reader->mxfFile;
EssenceReader *essenceReader = reader->essenceReader;
EssenceReaderData *data = essenceReader->data;
NSFileIndex *nsIndex = &data->nsIndex;
EssenceTrack *essenceTrack;
uint8_t *buffer;
mxfKey key;
uint8_t llen;
uint64_t len;
uint64_t cpCount;
int trackIndex;
/* must be positioned at start of a content package */
CHK_ORET(mxf_equals_key(&nsIndex->nextKey, &nsIndex->startContentPackageKey));
/* get KL read previously */
key = nsIndex->nextKey;
llen = nsIndex->nextLLen;
len = nsIndex->nextLen;
cpCount = mxfKey_extlen + llen;
/* process essence elements in content package */
while (nsIndex->contentPackageLen == 0 || cpCount <= nsIndex->contentPackageLen)
{
if (!skip && mxf_is_gc_essence_element(&key))
{
if (get_essence_track_with_tracknumber(essenceReader, mxf_get_track_number(&key), &essenceTrack,
&trackIndex))
{
/* send data to listener */
if (accept_frame(listener, trackIndex))
{
if (listener && listener->allocate_buffer(listener, trackIndex, &buffer, len))
{
CHK_ORET(mxf_file_read(mxfFile, buffer, len) == len);
CHK_ORET(send_frame(reader, listener, trackIndex, buffer, len));
}
else
{
CHK_ORET(mxf_skip(mxfFile, len));
}
}
else
{
CHK_ORET(mxf_skip(mxfFile, len));
}
cpCount += len;
}
else if (element_is_known_system_item(&key))
{
CHK_ORET(extract_system_item_info(reader, &key, len,
reader->essenceReader->data->nsIndex.currentPosition));
cpCount += len;
}
else
{
CHK_ORET(mxf_skip(mxfFile, len));
cpCount += len;
}
}
else
{
CHK_ORET(mxf_skip(mxfFile, len));
cpCount += len;
}
if (!mxf_read_kl(mxfFile, &key, &llen, &len))
{
CHK_ORET(mxf_file_eof(mxfFile));
ns_set_next_kl(nsIndex, &g_Null_Key, 0, 0);
break;
}
ns_set_next_kl(nsIndex, &key, llen, len);
cpCount += mxfKey_extlen + llen;
/* if don't know the length of the content package then look out for the first element key
or the start of a new partition */
if (nsIndex->contentPackageLen == 0 &&
(mxf_is_partition_pack(&key) || mxf_equals_key(&key, &nsIndex->startContentPackageKey)))
{
break;
}
}
CHK_ORET(nsIndex->contentPackageLen == 0 || cpCount == nsIndex->contentPackageLen + mxfKey_extlen + llen);
/* set content package length if it was unknown */
if (nsIndex->contentPackageLen == 0)
{
nsIndex->contentPackageLen = cpCount - mxfKey_extlen - llen;
}
return 1;
}
static int read_content_package(MXFReader *reader, int skip, MXFReaderListener *listener)
{
MXFFile *mxfFile = reader->mxfFile;
EssenceReader *essenceReader = reader->essenceReader;
EssenceReaderData *data = essenceReader->data;
FileIndex *index = data->index;
EssenceTrack *essenceTrack;
uint8_t *buffer;
uint64_t bufferSize;
mxfKey key;
uint8_t llen;
uint64_t len;
uint64_t cpLen;
uint64_t cpCount;
int trackIndex;
get_next_kl(index, &key, &llen, &len);
cpLen = get_cp_len(index);
cpCount = mxfKey_extlen + llen;
/* process essence elements in content package */
while (cpCount <= cpLen)
{
if (!skip && mxf_is_gc_essence_element(&key))
{
/* send data to listener */
if (get_essence_track_with_tracknumber(essenceReader, mxf_get_track_number(&key), &essenceTrack,
&trackIndex))
{
if (accept_frame(listener, trackIndex))
{
CHK_ORET(read_frame(reader, listener, trackIndex, len, &buffer, &bufferSize));
CHK_ORET(send_frame(reader, listener, trackIndex, buffer, bufferSize));
}
else
{
CHK_ORET(mxf_skip(mxfFile, len));
}
cpCount += len;
}
else if (element_is_known_system_item(&key))
{
CHK_ORET(extract_system_item_info(reader, &key, len,
get_current_position(reader->essenceReader->data->index)));
cpCount += len;
}
else
{
CHK_ORET(mxf_skip(mxfFile, len));
cpCount += len;
}
}
else
{
CHK_ORET(mxf_skip(mxfFile, len));
cpCount += len;
}
if (!mxf_read_kl(mxfFile, &key, &llen, &len))
{
CHK_ORET(mxf_file_eof(mxfFile));
set_next_kl(index, &g_Null_Key, 0, 0);
break;
}
set_next_kl(index, &key, llen, len);
cpCount += mxfKey_extlen + llen;
}
CHK_ORET(cpCount == cpLen + mxfKey_extlen + llen);
return 1;
}
static int ns_pos_at_next_frame(MXFReader *reader)
{
MXFFile *mxfFile = reader->mxfFile;
EssenceReader *essenceReader = reader->essenceReader;
EssenceReaderData *data = essenceReader->data;
NSFileIndex *nsIndex = &data->nsIndex;
MXFPartition *partition = NULL;
mxfKey key;
uint8_t llen;
uint64_t len;
int atEOF;
/* move to next partition if at end of current partition */
if (mxf_is_partition_pack(&nsIndex->nextKey))
{
key = nsIndex->nextKey;
llen = nsIndex->nextLLen;
len = nsIndex->nextLen;
atEOF = 0;
while (!atEOF)
{
/* read partition pack and check if it contains essence */
CHK_OFAIL(mxf_read_partition(mxfFile, &key, &partition));
if (data->bodySID == partition->bodySID)
{
CHK_OFAIL(ns_position_at_first_frame(reader));
mxf_free_partition(&partition);
break;
}
mxf_free_partition(&partition);
/* skip this partition */
while (!atEOF)
{
if (!mxf_read_kl(mxfFile, &key, &llen, &len))
{
/* if we fail to read then we must be at eof */
CHK_OFAIL(mxf_file_eof(mxfFile));
atEOF = 1;
ns_set_next_kl(nsIndex, &g_Null_Key, 0, 0);
break;
}
ns_set_next_kl(nsIndex, &key, llen, len);
if (mxf_is_partition_pack(&key))
{
break;
}
CHK_OFAIL(mxf_skip(mxfFile, len));
}
}
CHK_ORET(atEOF || mxf_equals_key(&key, &nsIndex->startContentPackageKey));
}
return 1;
fail:
mxf_free_partition(&partition);
return 0;
}
static int ns_position_at_first_frame(MXFReader *reader)
{
MXFFile *mxfFile = reader->mxfFile;
EssenceReader *essenceReader = reader->essenceReader;
EssenceReaderData *data = essenceReader->data;
NSFileIndex *nsIndex = &data->nsIndex;
MXFPartition *partition = data->headerPartition;
mxfKey key;
uint8_t llen;
uint64_t len;
/* move to the first partition that contains essence data */
while (data->bodySID != partition->bodySID)
{
if (!mxf_read_kl(mxfFile, &key, &llen, &len))
{
CHK_OFAIL(mxf_file_eof(mxfFile));
ns_set_next_kl(nsIndex, &g_Null_Key, 0, 0);
return 1;
}
while (!mxf_is_partition_pack(&key))
{
CHK_OFAIL(mxf_skip(mxfFile, len));
if (!mxf_read_kl(mxfFile, &key, &llen, &len))
{
CHK_OFAIL(mxf_file_eof(mxfFile));
ns_set_next_kl(nsIndex, &g_Null_Key, 0, 0);
return 1;
}
}
if (partition != NULL && partition != data->headerPartition)
{
mxf_free_partition(&partition);
}
CHK_OFAIL(mxf_read_partition(mxfFile, &key, &partition));
}
/* move to start of essence data in partition */
/* if we are in the header partition then the file is positioned after the header metadata,
otherwise we are positioned after the partition pack that was just read */
if (partition != data->headerPartition)
{
/* skip initial filler which is not included in any header or index byte counts */
if (!mxf_read_next_nonfiller_kl(mxfFile, &key, &llen, &len))
{
CHK_ORET(mxf_file_eof(mxfFile));
ns_set_next_kl(nsIndex, &g_Null_Key, 0, 0);
return 1;
}
/* skip header metadata */
if (partition->headerByteCount > 0)
{
CHK_ORET(mxf_skip(mxfFile, partition->headerByteCount - mxfKey_extlen - llen));
if (!mxf_read_kl(mxfFile, &key, &llen, &len))
{
CHK_ORET(mxf_file_eof(mxfFile));
ns_set_next_kl(nsIndex, &g_Null_Key, 0, 0);
return 1;
}
}
else
{
CHK_ORET(!mxf_is_header_metadata(&key));
}
}
else
{
if (!mxf_read_kl(mxfFile, &key, &llen, &len))
{
CHK_ORET(mxf_file_eof(mxfFile));
ns_set_next_kl(nsIndex, &g_Null_Key, 0, 0);
return 1;
}
}
/* skip index table segments. Note: we are not checking for segment key because it
could be non-standard, eg. MXF V10 indexes */
if (partition->indexByteCount > 0)
{
CHK_ORET(mxf_skip(mxfFile, partition->indexByteCount - mxfKey_extlen - llen));
if (!mxf_read_kl(mxfFile, &key, &llen, &len))
{
CHK_ORET(mxf_file_eof(mxfFile));
ns_set_next_kl(nsIndex, &g_Null_Key, 0, 0);
return 1;
}
}
/* check the first essence element KL and position after */
CHK_ORET(mxf_is_gc_essence_element(&key));
if (mxf_equals_key(&nsIndex->startContentPackageKey, &g_Null_Key))
{
nsIndex->startContentPackageKey = key;
nsIndex->currentPosition = 0;
}
else
{
CHK_ORET(mxf_equals_key(&nsIndex->startContentPackageKey, &key));
}
ns_set_next_kl(nsIndex, &key, llen, len);
if (partition != NULL && partition != data->headerPartition)
{
mxf_free_partition(&partition);
}
return 1;
fail:
if (partition != NULL && partition != data->headerPartition)
{
mxf_free_partition(&partition);
}
return 0;
}
int op1a_initialise_reader(MXFReader *reader, MXFPartition **headerPartition)
{
MXFFile *mxfFile = reader->mxfFile;
EssenceReader *essenceReader = reader->essenceReader;
EssenceReaderData *data;
size_t i;
size_t numPartitions;
MXFPartition *partition;
mxfKey key;
uint8_t llen;
uint64_t len;
essenceReader->data = NULL;
/* init essence reader */
CHK_MALLOC_OFAIL(essenceReader->data, EssenceReaderData);
memset(essenceReader->data, 0, sizeof(EssenceReaderData));
essenceReader->data->headerPartition = *headerPartition;
essenceReader->close = op1a_close;
essenceReader->position_at_frame = op1a_position_at_frame;
essenceReader->skip_next_frame = op1a_skip_next_frame;
essenceReader->read_next_frame = op1a_read_next_frame;
essenceReader->get_next_frame_number = op1a_get_next_frame_number;
essenceReader->get_last_written_frame_number = op1a_get_last_written_frame_number;
essenceReader->get_header_metadata = op1a_get_header_metadata;
essenceReader->have_footer_metadata = op1a_have_footer_metadata;
essenceReader->set_frame_rate = op1a_set_frame_rate;
data = essenceReader->data;
if (mxf_file_is_seekable(mxfFile))
{
/* get the file partitions */
CHK_OFAIL(get_file_partitions(mxfFile, data->headerPartition, &data->partitions));
/* process the last instance of header metadata */
numPartitions = mxf_get_list_length(&data->partitions);
for (i = numPartitions; i > 0; i--)
{
partition = (MXFPartition*)mxf_get_list_element(&data->partitions, i - 1);
if (partition->headerByteCount != 0)
{
if (!mxf_partition_is_closed(&partition->key))
{
mxf_log_warn("No closed partition with header metadata found" LOG_LOC_FORMAT, LOG_LOC_PARAMS);
}
if (!mxf_partition_is_complete(&partition->key))
{
mxf_log_warn("No complete partition with header metadata found" LOG_LOC_FORMAT, LOG_LOC_PARAMS);
}
/* seek to start of partition and skip the partition pack */
CHK_OFAIL(mxf_file_seek(mxfFile, partition->thisPartition, SEEK_SET));
CHK_OFAIL(mxf_read_kl(mxfFile, &key, &llen, &len));
CHK_OFAIL(mxf_skip(mxfFile, len));
CHK_OFAIL(process_metadata(reader, partition));
if (mxf_is_footer_partition_pack(&partition->key))
{
data->haveFooterMetadata = 1;
}
break;
}
}
if (i == 0)
{
mxf_log_error("No partition with header metadata found" LOG_LOC_FORMAT, LOG_LOC_PARAMS);
goto fail;
}
if (!reader->isMetadataOnly)
{
/* create file index */
CHK_OFAIL(create_index(mxfFile, &data->partitions, data->indexSID, data->bodySID, &data->index));
/* position at start of essence */
CHK_OFAIL(set_position(mxfFile, data->index, 0));
}
}
else
{
essenceReader->data->nsIndex.currentPosition = -1;
/* process the header metadata */
if (!mxf_partition_is_closed(&data->headerPartition->key))
{
mxf_log_warn("Header partition is not closed" LOG_LOC_FORMAT, LOG_LOC_PARAMS);
}
if (!mxf_partition_is_complete(&data->headerPartition->key))
{
mxf_log_warn("Header partition is incomplete" LOG_LOC_FORMAT, LOG_LOC_PARAMS);
}
CHK_OFAIL(process_metadata(reader, data->headerPartition));
if (!reader->isMetadataOnly)
{
/* position at start of essence */
CHK_OFAIL(ns_position_at_first_frame(reader));
}
}
*headerPartition = NULL; /* take ownership */
return 1;
fail:
reader->essenceReader->data->headerPartition = NULL; /* release ownership */
/* essenceReader->close() will be called when closing the reader */
return 0;
}
