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mxf_op1a_reader.c
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mxf_op1a_reader.c
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/*
* MXF OP-1A reader
*
* Copyright (C) 2006, British Broadcasting Corporation
* All Rights Reserved.
*
* Author: Philip de Nier
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the British Broadcasting Corporation nor the names
* of its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <assert.h>
#include <inttypes.h>
#include "mxf_reader_int.h"
#include "mxf_op1a_reader.h"
#include "mxf_essence_helper.h"
#include "mxf_index_helper.h"
#include <mxf/mxf_uu_metadata.h>
#include <mxf/mxf_macros.h>
/* TODO: check assumptions (ie. limitation) are met */
/* TODO: check for best effort distinguished values in incomplete header metadata; also, these items could be missing */
/* TODO: combine multiple audio tracks into 1 multi-channel track (check tracknumber->channel assignments) */
/* TODO: disable audio in DV essence if audio tracks are present (eg. add option to VLC rawdv demux to disable audio) */
/* TODO: read index tables; get content package size from index table */
/* TODO: use body offset to calculate first frame number ? */
/* TODO: handle default 0 values for partition->previousPartition or partition->footerPartion */
typedef struct
{
MXFTrack *track;
int isVideo;
uint32_t trackID;
uint32_t trackNumber;
mxfRational editRate;
mxfLength duration;
mxfUMID sourcePackageUID;
uint32_t sourceTrackID;
uint32_t sortedTrackIndex;
} WrappedTrack;
typedef struct
{
mxfPosition currentPosition;
mxfKey startContentPackageKey;
uint64_t contentPackageLen;
mxfKey nextKey;
uint8_t nextLLen;
uint64_t nextLen;
} NSFileIndex;
struct EssenceReaderData
{
MXFPartition *headerPartition;
MXFHeaderMetadata *headerMetadata;
int haveFooterMetadata;
MXFList partitions;
uint32_t indexSID;
uint32_t bodySID;
FileIndex *index;
NSFileIndex nsIndex; /* file index for non-seekable file */
};
static void free_partition_in_list(void *data)
{
MXFPartition *partition;
if (data == NULL)
{
return;
}
partition = (MXFPartition*)data;
mxf_free_partition(&partition);
}
static int ns_end_of_essence(NSFileIndex *nsIndex)
{
return !mxf_equals_key(&nsIndex->nextKey, &nsIndex->startContentPackageKey);
}
static void ns_set_next_kl(NSFileIndex *nsIndex, const mxfKey *key, uint8_t llen, uint64_t len)
{
nsIndex->nextKey = *key;
nsIndex->nextLLen = llen;
nsIndex->nextLen = len;
}
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, len, &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;
}
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, len, &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 process_metadata(MXFReader *reader, MXFPartition *partition)
{
MXFFile *mxfFile = reader->mxfFile;
EssenceReader *essenceReader = reader->essenceReader;
EssenceReaderData *data = essenceReader->data;
mxfKey key;
uint8_t llen;
uint64_t len;
MXFMetadataSet *essContainerDataSet;
MXFMetadataSet *sourcePackageSet;
MXFMetadataSet *sourcePackageTrackSet;
MXFMetadataSet *materialPackageSet;
MXFMetadataSet *materialPackageTrackSet;
MXFMetadataSet *descriptorSet;
MXFArrayItemIterator arrayIter;
mxfUL dataDefUL;
MXFTrack *track;
EssenceTrack *essenceTrack;
MXFList wrappedTracks;
MXFList sortedWrappedTracks;
WrappedTrack *newWrappedTrack = NULL;
WrappedTrack *wrappedTrack;
WrappedTrack *sortedWrappedTrack;
WrappedTrack *prevSortedWrappedTrack;
WrappedTrack *firstSortedWrappedTrack;
MXFListIterator listIter;
MXFListIterator sortedListIter;
int wasInserted;
int haveZeroTrackNumber;
uint32_t trackID;
mxf_initialise_list(&wrappedTracks, free);
mxf_initialise_list(&sortedWrappedTracks, NULL);
/* create and read the header metadata */
CHK_OFAIL(mxf_read_next_nonfiller_kl(mxfFile, &key, &llen, &len));
CHK_OFAIL(mxf_is_header_metadata(&key));
CHK_OFAIL(mxf_create_header_metadata(&data->headerMetadata, reader->dataModel));
CHK_OFAIL(mxf_read_header_metadata(mxfFile, data->headerMetadata,
partition->headerByteCount, &key, llen, len));
/* check for metadata only files */
if (!mxf_find_singular_set_by_key(data->headerMetadata, &MXF_SET_K(EssenceContainerData), &essContainerDataSet))
{
reader->isMetadataOnly = 1;
return 1;
}
/* get the body and index SID from the (single essence container; external essence not supported) */
CHK_OFAIL(mxf_get_uint32_item(essContainerDataSet, &MXF_ITEM_K(EssenceContainerData, BodySID), &data->bodySID));
if (mxf_have_item(essContainerDataSet, &MXF_ITEM_K(EssenceContainerData, IndexSID)))
{
CHK_OFAIL(mxf_get_uint32_item(essContainerDataSet, &MXF_ITEM_K(EssenceContainerData, IndexSID), &data->indexSID));
}
else
{
data->indexSID = 0;
}
/* get the clip duration */
CHK_OFAIL(get_clip_duration(data->headerMetadata, &reader->clip, 0));
/* get the tracks from the (single) material package */
haveZeroTrackNumber = 0;
CHK_OFAIL(mxf_find_singular_set_by_key(data->headerMetadata, &MXF_SET_K(MaterialPackage), &materialPackageSet));
CHK_OFAIL(mxf_uu_get_package_tracks(materialPackageSet, &arrayIter));
while (mxf_uu_next_track(data->headerMetadata, &arrayIter, &materialPackageTrackSet))
{
/* CHK_OFAIL(mxf_uu_get_track_datadef(materialPackageTrackSet, &dataDefUL)); */
/* NOTE: not failing because files from Omneon were found to have a missing DataDefinition item
in the Sequence and DMSourceClip referenced by a static DM Track */
if (!mxf_uu_get_track_datadef(materialPackageTrackSet, &dataDefUL))
{
continue;
}
if (mxf_is_picture(&dataDefUL) || mxf_is_sound(&dataDefUL))
{
CHK_MALLOC_OFAIL(newWrappedTrack, WrappedTrack);
memset(newWrappedTrack, 0, sizeof(WrappedTrack));
CHK_OFAIL(mxf_append_list_element(&wrappedTracks, newWrappedTrack));
wrappedTrack = newWrappedTrack;
newWrappedTrack = NULL; /* assigned to list so set to NULL so not free'ed in fail */
CHK_OFAIL(add_track(reader, &track));
wrappedTrack->track = track;
if (mxf_have_item(materialPackageTrackSet, &MXF_ITEM_K(GenericTrack, TrackNumber)))
{
CHK_OFAIL(mxf_get_uint32_item(materialPackageTrackSet, &MXF_ITEM_K(GenericTrack, TrackNumber), &wrappedTrack->trackNumber));
}
else
{
wrappedTrack->trackNumber = 0;
}
CHK_OFAIL(mxf_get_uint32_item(materialPackageTrackSet, &MXF_ITEM_K(GenericTrack, TrackID), &wrappedTrack->trackID));
CHK_OFAIL(mxf_get_rational_item(materialPackageTrackSet, &MXF_ITEM_K(Track, EditRate), &wrappedTrack->editRate));
CHK_OFAIL(mxf_uu_get_track_duration(materialPackageTrackSet, &wrappedTrack->duration));
CHK_OFAIL(mxf_uu_get_track_reference(materialPackageTrackSet, &wrappedTrack->sourcePackageUID, &wrappedTrack->sourceTrackID));
wrappedTrack->isVideo = mxf_is_picture(&dataDefUL);
track->isVideo = wrappedTrack->isVideo;
track->materialTrackID = wrappedTrack->trackID;
track->materialTrackNumber = wrappedTrack->trackNumber;
if (wrappedTrack->isVideo)
{
track->video.frameRate = wrappedTrack->editRate;
}
if (wrappedTrack->trackNumber == 0)
{
haveZeroTrackNumber = 1;
}
}
}
/* sort the tracks; use trackNumber if != 0 else use the trackID; video track is always first */
mxf_initialise_list_iter(&listIter, &wrappedTracks);
while (mxf_next_list_iter_element(&listIter))
{
wrappedTrack = (WrappedTrack*)mxf_get_iter_element(&listIter);
wasInserted = 0;
mxf_initialise_list_iter(&sortedListIter, &sortedWrappedTracks);
while (mxf_next_list_iter_element(&sortedListIter))
{
sortedWrappedTrack = (WrappedTrack*)mxf_get_iter_element(&sortedListIter);
if ((wrappedTrack->track->isVideo && !sortedWrappedTrack->track->isVideo) ||
(wrappedTrack->track->isVideo == sortedWrappedTrack->track->isVideo &&
((!haveZeroTrackNumber && wrappedTrack->trackNumber < sortedWrappedTrack->trackNumber) ||
(haveZeroTrackNumber && wrappedTrack->trackID < sortedWrappedTrack->trackID))))
{
CHK_OFAIL(mxf_insert_list_element(&sortedWrappedTracks, mxf_get_list_iter_index(&sortedListIter),
1, wrappedTrack));
wasInserted = 1;
break;
}
}
if (!wasInserted)
{
CHK_OFAIL(mxf_append_list_element(&sortedWrappedTracks, wrappedTrack));
}
}
/* set the MXFTracks to the same order */
prevSortedWrappedTrack = NULL;
firstSortedWrappedTrack = NULL;
mxf_initialise_list_iter(&sortedListIter, &sortedWrappedTracks);
while (mxf_next_list_iter_element(&sortedListIter))
{
sortedWrappedTrack = (WrappedTrack*)mxf_get_iter_element(&sortedListIter);
if (firstSortedWrappedTrack == NULL)
{
firstSortedWrappedTrack = sortedWrappedTrack;
}
if (prevSortedWrappedTrack != NULL)
{
prevSortedWrappedTrack->track->next = sortedWrappedTrack->track;
}
prevSortedWrappedTrack = sortedWrappedTrack;
}
if (prevSortedWrappedTrack != NULL)
{
prevSortedWrappedTrack->track->next = NULL;
}
if (firstSortedWrappedTrack != NULL)
{
reader->clip.tracks = firstSortedWrappedTrack->track;
}
/* process source package tracks and linked descriptors */
mxf_initialise_list_iter(&sortedListIter, &sortedWrappedTracks);
while (mxf_next_list_iter_element(&sortedListIter))
{
sortedWrappedTrack = (WrappedTrack*)mxf_get_iter_element(&sortedListIter);
CHK_OFAIL(mxf_uu_get_referenced_track(data->headerMetadata, &sortedWrappedTrack->sourcePackageUID,
sortedWrappedTrack->sourceTrackID, &sourcePackageTrackSet));
CHK_OFAIL(add_essence_track(essenceReader, &essenceTrack));
essenceTrack->isVideo = sortedWrappedTrack->isVideo;
if (mxf_have_item(sourcePackageTrackSet, &MXF_ITEM_K(GenericTrack, TrackNumber)))
{
CHK_OFAIL(mxf_get_uint32_item(sourcePackageTrackSet, &MXF_ITEM_K(GenericTrack, TrackNumber), &essenceTrack->trackNumber));
}
else
{
essenceTrack->trackNumber = 0;
}
CHK_OFAIL(mxf_get_uint32_item(sourcePackageTrackSet, &MXF_ITEM_K(GenericTrack, TrackID), &trackID));
essenceTrack->frameRate = reader->clip.frameRate;
essenceTrack->playoutDuration = reader->clip.duration;
essenceTrack->indexSID = data->indexSID;
essenceTrack->bodySID = data->bodySID;
/* process the descriptor */
CHK_OFAIL(mxf_uu_get_referenced_package(data->headerMetadata, &sortedWrappedTrack->sourcePackageUID,
&sourcePackageSet));
CHK_OFAIL(mxf_uu_get_track_descriptor(sourcePackageSet, trackID, &descriptorSet));
if (mxf_is_subclass_of(data->headerMetadata->dataModel, &descriptorSet->key, &MXF_SET_K(CDCIEssenceDescriptor)))
{
CHK_OFAIL(process_cdci_descriptor(descriptorSet, sortedWrappedTrack->track, essenceTrack));
}
else if (mxf_is_subclass_of(data->headerMetadata->dataModel, &descriptorSet->key, &MXF_SET_K(WaveAudioDescriptor)))
{
CHK_OFAIL(process_wav_descriptor(descriptorSet, sortedWrappedTrack->track, essenceTrack));
}
else if (mxf_is_subclass_of(data->headerMetadata->dataModel, &descriptorSet->key, &MXF_SET_K(GenericSoundEssenceDescriptor)))
{
CHK_OFAIL(process_sound_descriptor(descriptorSet, track, essenceTrack));
}
else
{
mxf_log_error("Unsupported file descriptor" LOG_LOC_FORMAT, LOG_LOC_PARAMS);
return 0;
}
}
/* initialise the playout timecode */
if (!initialise_playout_timecode(reader, materialPackageSet))
{
CHK_ORET(initialise_default_playout_timecode(reader));
}
/* initialise the source timecodes */
initialise_source_timecodes(reader, sourcePackageSet);
mxf_clear_list(&wrappedTracks);
mxf_clear_list(&sortedWrappedTracks);
return 1;
fail:
SAFE_FREE(newWrappedTrack);
mxf_clear_list(&wrappedTracks);
mxf_clear_list(&sortedWrappedTracks);
return 0;
}
static int get_file_partitions(MXFFile *mxfFile, MXFPartition *headerPartition, MXFList *partitions)
{
mxfKey key;
uint8_t llen;
uint64_t len;
MXFPartition *partition = NULL;
MXFPartition *partitionRef;
uint64_t thisPartition;
MXFRIP rip;
MXFRIPEntry *ripEntry;
MXFListIterator iter;
mxf_initialise_list(partitions, free_partition_in_list);
memset(&rip, 0, sizeof(MXFRIP));
/* use the RIP if there is one */
if (mxf_read_rip(mxfFile, &rip))
{
mxf_initialise_list_iter(&iter, &rip.entries);
while (mxf_next_list_iter_element(&iter))
{
ripEntry = (MXFRIPEntry*)mxf_get_iter_element(&iter);
/* seek to partition and read and add to list */
CHK_OFAIL(mxf_file_seek(mxfFile, mxf_get_runin_len(mxfFile) + ripEntry->thisPartition,
SEEK_SET));
CHK_OFAIL(mxf_read_kl(mxfFile, &key, &llen, &len));
CHK_OFAIL(mxf_is_partition_pack(&key));
CHK_OFAIL(mxf_read_partition(mxfFile, &key, len, &partition));
CHK_OFAIL(mxf_append_list_element(partitions, partition));
partition = NULL; /* owned by list */
}
}
/* start from footer partition and index back to the header partition */
else
{
if (headerPartition->footerPartition == 0)
{
/* no footer partition or at unknown position, so we only index the header partition */
goto fail;
}
thisPartition = headerPartition->footerPartition;
do
{
/* seek to partition and read and add to list */
CHK_OFAIL(mxf_file_seek(mxfFile, mxf_get_runin_len(mxfFile) + thisPartition, SEEK_SET));
CHK_OFAIL(mxf_read_kl(mxfFile, &key, &llen, &len));
CHK_OFAIL(mxf_is_partition_pack(&key));
CHK_OFAIL(mxf_read_partition(mxfFile, &key, len, &partition));
CHK_OFAIL(mxf_prepend_list_element(partitions, partition));
partitionRef = partition;
partition = NULL; /* owned by list */
thisPartition = partitionRef->previousPartition;
}
while (partitionRef->thisPartition != partitionRef->previousPartition);
}
mxf_clear_rip(&rip);
return 1;
fail:
/* if something failed then just add the header partition
Note: some Omneon files had references to a footer partition which was not
actually present in the file */
mxf_clear_list(partitions);
mxf_free_partition(&partition);
mxf_clear_rip(&rip);
/* create copy of header partition pack */
CHK_ORET(mxf_create_from_partition(headerPartition, &partition));
partition->key = headerPartition->key;
partition->majorVersion = headerPartition->majorVersion;
partition->minorVersion = headerPartition->minorVersion;
partition->kagSize = headerPartition->kagSize;
partition->thisPartition = headerPartition->thisPartition;
partition->previousPartition = headerPartition->previousPartition;
partition->footerPartition = headerPartition->footerPartition;
partition->headerByteCount = headerPartition->headerByteCount;
partition->indexByteCount = headerPartition->indexByteCount;
partition->indexSID = headerPartition->indexSID;
partition->bodyOffset = headerPartition->bodyOffset;
partition->bodySID = headerPartition->bodySID;
/* add partition to list */
if (!mxf_append_list_element(partitions, partition))
{
mxf_free_partition(&partition);
mxf_log_error("Failed to append header partition to list" LOG_LOC_FORMAT, LOG_LOC_PARAMS);
return 0;
}
return 1;
}
static void op1a_close(MXFReader *reader)
{
if (reader->essenceReader == NULL || reader->essenceReader->data == NULL)
{
return;
}
mxf_free_header_metadata(&reader->essenceReader->data->headerMetadata);
mxf_free_partition(&reader->essenceReader->data->headerPartition);
free_index(&reader->essenceReader->data->index);
mxf_clear_list(&reader->essenceReader->data->partitions);
SAFE_FREE(reader->essenceReader->data);
}
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_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;
/* The implementation below only supports a 32-bit size */
CHK_ORET(len <= UINT32_MAX);
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, (uint32_t)len))
{
CHK_ORET(mxf_file_read(mxfFile, buffer, (uint32_t)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 op1a_position_at_frame(MXFReader *reader, int64_t frameNumber)
{
MXFFile *mxfFile = reader->mxfFile;
EssenceReader *essenceReader = reader->essenceReader;
EssenceReaderData *data = essenceReader->data;
CHK_ORET(mxf_file_is_seekable(mxfFile));
CHK_ORET(set_position(mxfFile, data->index, frameNumber));
return 1;
}
static int64_t op1a_get_last_written_frame_number(MXFReader *reader)
{
MXFFile *mxfFile = reader->mxfFile;
EssenceReader *essenceReader = reader->essenceReader;
EssenceReaderData *data = essenceReader->data;
return ix_get_last_written_frame_number(mxfFile, data->index, reader->clip.duration);
}
static int op1a_skip_next_frame(MXFReader *reader)
{
MXFFile *mxfFile = reader->mxfFile;
EssenceReader *essenceReader = reader->essenceReader;
EssenceReaderData *data = essenceReader->data;
/* set position at start of next content package */
if (mxf_file_is_seekable(mxfFile))
{
if (end_of_essence(data->index))
{
return -1;
}
CHK_ORET(set_position(mxfFile, data->index, get_current_position(data->index) + 1));
if (end_of_essence(data->index))
{
return -1;
}
}
else
{
if (ns_end_of_essence(&data->nsIndex))
{
return -1;
}
CHK_ORET(ns_pos_at_next_frame(reader));
if (ns_end_of_essence(&data->nsIndex))
{
return -1;
}
CHK_ORET(ns_read_content_package(reader, 1 /* skip */, NULL));
data->nsIndex.currentPosition++;
}
return 1;
}
static int op1a_read_next_frame(MXFReader *reader, MXFReaderListener *listener)
{
MXFFile *mxfFile = reader->mxfFile;
EssenceReader *essenceReader = reader->essenceReader;
EssenceReaderData *data = essenceReader->data;
/* set position at start of the current content package */
if (mxf_file_is_seekable(mxfFile))
{
if (end_of_essence(data->index))
{
return -1;
}
CHK_ORET(set_position(mxfFile, data->index, get_current_position(data->index)));
if (end_of_essence(data->index))
{
return -1;
}
CHK_ORET(read_content_package(reader, 0, listener));
increment_current_position(data->index);
}
else
{
if (ns_end_of_essence(&data->nsIndex))
{
return -1;
}
CHK_ORET(ns_pos_at_next_frame(reader));
if (ns_end_of_essence(&data->nsIndex))
{
return -1;
}
CHK_ORET(ns_read_content_package(reader, 0, listener));
data->nsIndex.currentPosition++;
}
return 1;
}
static int64_t op1a_get_next_frame_number(MXFReader *reader)
{
if (mxf_file_is_seekable(reader->mxfFile))
{
return get_current_position(reader->essenceReader->data->index);
}
else
{
return reader->essenceReader->data->nsIndex.currentPosition;
}
}
static MXFHeaderMetadata* op1a_get_header_metadata(MXFReader *reader)
{
return reader->essenceReader->data->headerMetadata;
}
static int op1a_have_footer_metadata(MXFReader *reader)
{
return reader->essenceReader->data->haveFooterMetadata;
}
static int op1a_set_frame_rate(MXFReader *reader, const mxfRational *frameRate)
{
/* avoid compiler warnings */