/**
* @param blockInfo
* @return space currently available for writing all Flac metadatablocks except for StreamInfo
* which is fixed size
*/
private int computeAvailableRoom(MetadataBlockInfo blockInfo) {
int length = 0;
for (MetadataBlock aMetadataBlockApplication : blockInfo.metadataBlockApplication) {
length += aMetadataBlockApplication.getLength();
}
for (MetadataBlock aMetadataBlockSeekTable : blockInfo.metadataBlockSeekTable) {
length += aMetadataBlockSeekTable.getLength();
}
for (MetadataBlock aMetadataBlockCueSheet : blockInfo.metadataBlockCueSheet) {
length += aMetadataBlockCueSheet.getLength();
}
for (MetadataBlock aMetadataBlockPadding : blockInfo.metadataBlockPadding) {
length += aMetadataBlockPadding.getLength();
}
return length;
}
/**
* Write tag to file
*
* @param tag
* @param raf
* @param rafTemp
* @throws CannotWriteException
* @throws IOException
*/
public void write(Tag tag, RandomAccessFile raf, RandomAccessFile rafTemp)
throws CannotWriteException, IOException {
logger.config("Writing tag");
MetadataBlockInfo blockInfo = new MetadataBlockInfo();
// Read existing data
FlacStreamReader flacStream = new FlacStreamReader(raf);
try {
flacStream.findStream();
} catch (CannotReadException cre) {
throw new CannotWriteException(cre.getMessage());
}
boolean isLastBlock = false;
while (!isLastBlock) {
MetadataBlockHeader mbh = MetadataBlockHeader.readHeader(raf);
switch (mbh.getBlockType()) {
case STREAMINFO:
{
blockInfo.streamInfoBlock =
new MetadataBlock(mbh, new MetadataBlockDataStreamInfo(mbh, raf));
break;
}
case VORBIS_COMMENT:
case PADDING:
case PICTURE:
{
// All these will be replaced by the new metadata so we just treat as padding in order
// to determine how much space is already allocated in the file
raf.seek(raf.getFilePointer() + mbh.getDataLength());
MetadataBlockData mbd = new MetadataBlockDataPadding(mbh.getDataLength());
blockInfo.metadataBlockPadding.add(new MetadataBlock(mbh, mbd));
break;
}
case APPLICATION:
{
MetadataBlockData mbd = new MetadataBlockDataApplication(mbh, raf);
blockInfo.metadataBlockApplication.add(new MetadataBlock(mbh, mbd));
break;
}
case SEEKTABLE:
{
MetadataBlockData mbd = new MetadataBlockDataSeekTable(mbh, raf);
blockInfo.metadataBlockSeekTable.add(new MetadataBlock(mbh, mbd));
break;
}
case CUESHEET:
{
MetadataBlockData mbd = new MetadataBlockDataCueSheet(mbh, raf);
blockInfo.metadataBlockCueSheet.add(new MetadataBlock(mbh, mbd));
break;
}
default:
{
// What are the consequences of doing this
raf.seek(raf.getFilePointer() + mbh.getDataLength());
break;
}
}
isLastBlock = mbh.isLastBlock();
}
// Number of bytes in the existing file available before audio data
int availableRoom = computeAvailableRoom(blockInfo);
// Minimum Size of the New tag data without padding
int newTagSize = tc.convert(tag).limit();
// Number of bytes required for new tagdata and other metadata blocks
int neededRoom = newTagSize + computeNeededRoom(blockInfo);
// Go to start of Flac within file
raf.seek(flacStream.getStartOfFlacInFile());
logger.config("Writing tag available bytes:" + availableRoom + ":needed bytes:" + neededRoom);
// There is enough room to fit the tag without moving the audio just need to
// adjust padding accordingly need to allow space for padding header if padding required
if ((availableRoom == neededRoom)
|| (availableRoom > neededRoom + MetadataBlockHeader.HEADER_LENGTH)) {
// Jump over Id3 (if exists) Flac and StreamInfoBlock
raf.seek(flacStream.getStartOfFlacInFile() + FlacStreamReader.FLAC_STREAM_IDENTIFIER_LENGTH);
// Write StreamInfo, we always write this first even if wasn't first in original spec
raf.write(blockInfo.streamInfoBlock.getHeader().getBytesWithoutIsLastBlockFlag());
raf.write(blockInfo.streamInfoBlock.getData().getBytes());
// Write Application Blocks
for (MetadataBlock aMetadataBlockApplication : blockInfo.metadataBlockApplication) {
raf.write(aMetadataBlockApplication.getHeader().getBytesWithoutIsLastBlockFlag());
raf.write(aMetadataBlockApplication.getData().getBytes());
}
// Write Seek Table Blocks
for (MetadataBlock aMetadataBlockSeekTable : blockInfo.metadataBlockSeekTable) {
raf.write(aMetadataBlockSeekTable.getHeader().getBytesWithoutIsLastBlockFlag());
raf.write(aMetadataBlockSeekTable.getData().getBytes());
}
// Write Cue sheet Blocks
for (MetadataBlock aMetadataBlockCueSheet : blockInfo.metadataBlockCueSheet) {
raf.write(aMetadataBlockCueSheet.getHeader().getBytesWithoutIsLastBlockFlag());
raf.write(aMetadataBlockCueSheet.getData().getBytes());
}
// Write tag (and padding)
raf.getChannel().write(tc.convert(tag, availableRoom - neededRoom));
}
// Need to move audio
else {
// Skip to start of Audio
// If Flac tag contains ID3header or something before start of official Flac header copy it
// over
if (flacStream.getStartOfFlacInFile() > 0) {
raf.seek(0);
rafTemp.getChannel().transferFrom(raf.getChannel(), 0, flacStream.getStartOfFlacInFile());
rafTemp.seek(flacStream.getStartOfFlacInFile());
}
rafTemp.writeBytes(FlacStreamReader.FLAC_STREAM_IDENTIFIER);
rafTemp.writeByte(0); // To ensure never set Last-metadata-block flag even if was before
int uptoStreamHeaderSize =
flacStream.getStartOfFlacInFile()
+ FlacStreamReader.FLAC_STREAM_IDENTIFIER_LENGTH
+ MetadataBlockHeader.BLOCK_TYPE_LENGTH;
rafTemp.seek(uptoStreamHeaderSize);
raf.seek(uptoStreamHeaderSize);
rafTemp
.getChannel()
.transferFrom(
raf.getChannel(),
uptoStreamHeaderSize,
MetadataBlockHeader.BLOCK_LENGTH
+ MetadataBlockDataStreamInfo.STREAM_INFO_DATA_LENGTH);
int dataStartSize =
flacStream.getStartOfFlacInFile()
+ FlacStreamReader.FLAC_STREAM_IDENTIFIER_LENGTH
+ MetadataBlockHeader.HEADER_LENGTH
+ MetadataBlockDataStreamInfo.STREAM_INFO_DATA_LENGTH;
rafTemp.seek(dataStartSize);
// Write all the metadatablocks
for (MetadataBlock aMetadataBlockApplication : blockInfo.metadataBlockApplication) {
rafTemp.write(aMetadataBlockApplication.getHeader().getBytesWithoutIsLastBlockFlag());
rafTemp.write(aMetadataBlockApplication.getData().getBytes());
}
for (MetadataBlock aMetadataBlockSeekTable : blockInfo.metadataBlockSeekTable) {
rafTemp.write(aMetadataBlockSeekTable.getHeader().getBytesWithoutIsLastBlockFlag());
rafTemp.write(aMetadataBlockSeekTable.getData().getBytes());
}
for (MetadataBlock aMetadataBlockCueSheet : blockInfo.metadataBlockCueSheet) {
rafTemp.write(aMetadataBlockCueSheet.getHeader().getBytesWithoutIsLastBlockFlag());
rafTemp.write(aMetadataBlockCueSheet.getData().getBytes());
}
// Write tag data use default padding
rafTemp.write(tc.convert(tag, FlacTagCreator.DEFAULT_PADDING).array());
// Write audio to new file
raf.seek(dataStartSize + availableRoom);
// Issue #385
// Transfer 'size' bytes from raf at its current position to rafTemp at position but do it in
// batches
// to prevent OutOfMemory exceptions
long amountToBeWritten = raf.getChannel().size() - raf.getChannel().position();
long written = 0;
long chunksize = TagOptionSingleton.getInstance().getWriteChunkSize();
long count = amountToBeWritten / chunksize;
long mod = amountToBeWritten % chunksize;
for (int i = 0; i < count; i++) {
written +=
rafTemp
.getChannel()
.transferFrom(raf.getChannel(), rafTemp.getChannel().position(), chunksize);
rafTemp.getChannel().position(rafTemp.getChannel().position() + chunksize);
}
written +=
rafTemp.getChannel().transferFrom(raf.getChannel(), rafTemp.getChannel().position(), mod);
if (written != amountToBeWritten) {
throw new CannotWriteException(
"Was meant to write "
+ amountToBeWritten
+ " bytes but only written "
+ written
+ " bytes");
}
}
}
