/**
* Every .FIT file starts of with a file header which is parsed here.
* @return string[] The file header
*/
protected function readFileHeader()
{
$this->file_header = array('header_size' => $this->reader->readUInt8(), 'protocol_version' => $this->reader->readUInt8(), 'profile_version' => $this->reader->readUInt16(), 'data_size' => $this->reader->readUInt32LE(), 'data_type' => $this->reader->readString8(4));
//when not found, the profile will be the default
$this->profile->setProtocolAndProfile($this->file_header['protocol_version'], $this->file_header['profile_version']);
if ($this->file_header['header_size'] > 12) {
$this->file_header += array('crc' => $this->reader->readUInt16LE());
}
//make sure we are at start of first record
$this->reader->setOffset($this->file_header['header_size']);
return $this->file_header;
}
/**
* Writes the possibly altered ID3v1 tag back to the file where it was read.
* If the class was constructed without a file name, one can be provided
* here as an argument. Regardless, the write operation will override
* previous tag information, if found.
*
* @param string $filename The optional path to the file.
* @throws Zend_Media_Id3_Exception if there is no file to write the tag to
*/
public function write($filename = null)
{
if ($filename === null && ($filename = $this->_filename) === null) {
require_once 'Zend/Media/Id3/Exception.php';
throw new Zend_Media_Id3_Exception('No file given to write the tag to');
}
require_once 'Zend/Io/FileWriter.php';
try {
$writer = new Zend_Io_FileWriter($filename);
$offset = $writer->getSize();
if ($this->_reader !== null) {
$offset = -128;
} else {
$reader = new Zend_Io_Reader($writer->getFileDescriptor());
$reader->setOffset(-128);
if ($reader->read(3) == 'TAG') {
$offset = -128;
}
}
$writer->setOffset($offset);
$writer->writeString8('TAG')->writeString8(substr($this->_title, 0, 30), 30)->writeString8(substr($this->_artist, 0, 30), 30)->writeString8(substr($this->_album, 0, 30), 30)->writeString8(substr($this->_year, 0, 4), 4);
if ($this->_track) {
$writer->writeString8(substr($this->_comment, 0, 28), 28)->writeInt8(0)->writeInt8($this->_track);
} else {
$writer->writeString8(substr($this->_comment, 0, 30), 30);
}
$writer->writeInt8($this->_genre);
$writer->flush();
} catch (Zend_Io_Exception $e) {
require_once 'Zend/Media/Id3/Exception.php';
throw new Zend_Media_Id3_Exception($e->getMessage());
}
$this->_filename = $filename;
}
/**
* Constructs the class with given filename.
*
* @param string|resource|Zend_Io_Reader $filename The path to the file,
* file descriptor of an opened file, or a {@link Zend_Io_Reader} instance.
* @throws Zend_Io_Exception if an error occur in stream handling.
* @throws Zend_Media_Flac_Exception if an error occurs in vorbis bitstream reading.
*/
public function __construct($filename)
{
if ($filename instanceof Zend_Io_Reader) {
$this->_reader =& $filename;
} else {
$this->_filename = $filename;
require_once 'Zend/Io/FileReader.php';
try {
$this->_reader = new Zend_Io_FileReader($filename);
} catch (Zend_Io_Exception $e) {
$this->_reader = null;
require_once 'Zend/Media/Flac/Exception.php';
throw new Zend_Media_Flac_Exception($e->getMessage());
}
}
$capturePattern = $this->_reader->read(4);
if ($capturePattern != 'fLaC') {
require_once 'Zend/Media/Flac/Exception.php';
throw new Zend_Media_Flac_Exception('Not a valid FLAC bitstream');
}
while (true) {
$offset = $this->_reader->getOffset();
$last = ($tmp = $this->_reader->readUInt8()) >> 7 & 0x1;
$type = $tmp & 0x7f;
$size = $this->_reader->readUInt24BE();
$this->_reader->setOffset($offset);
switch ($type) {
case self::STREAMINFO:
// 0
require_once 'Zend/Media/Flac/MetadataBlock/Streaminfo.php';
$this->_metadataBlocks[] = new Zend_Media_Flac_MetadataBlock_Streaminfo($this->_reader);
break;
case self::PADDING:
// 1
require_once 'Zend/Media/Flac/MetadataBlock/Padding.php';
$this->_metadataBlocks[] = new Zend_Media_Flac_MetadataBlock_Padding($this->_reader);
break;
case self::APPLICATION:
// 2
require_once 'Zend/Media/Flac/MetadataBlock/Application.php';
$this->_metadataBlocks[] = new Zend_Media_Flac_MetadataBlock_Application($this->_reader);
break;
case self::SEEKTABLE:
// 3
require_once 'Zend/Media/Flac/MetadataBlock/Seektable.php';
$this->_metadataBlocks[] = new Zend_Media_Flac_MetadataBlock_Seektable($this->_reader);
break;
case self::VORBIS_COMMENT:
// 4
require_once 'Zend/Media/Flac/MetadataBlock/VorbisComment.php';
$this->_metadataBlocks[] = new Zend_Media_Flac_MetadataBlock_VorbisComment($this->_reader);
break;
case self::CUESHEET:
// 5
require_once 'Zend/Media/Flac/MetadataBlock/Cuesheet.php';
$this->_metadataBlocks[] = new Zend_Media_Flac_MetadataBlock_Cuesheet($this->_reader);
break;
case self::PICTURE:
// 6
require_once 'Zend/Media/Flac/MetadataBlock/Picture.php';
$this->_metadataBlocks[] = new Zend_Media_Flac_MetadataBlock_Picture($this->_reader);
break;
default:
// break intentionally omitted
}
$this->_reader->setOffset($offset + 4 + $size);
// Jump off the loop if we reached the end of metadata blocks
if ($last === 1) {
break;
}
}
}
/**
* Overwrite the method to set the point of operation within the Ogg bitstream.
*
* @param integer $offset The new point of operation.
* @return void
* @throws Zend_Io_Exception if an I/O error occurs
*/
public function setOffset($offset)
{
$streamSize = 0;
for ($i = 0, $pageCount = count($this->_pages); $i < $pageCount; $i++) {
if ($streamSize + $this->_pages[$i]['page']->getPageSize() >= $offset) {
$this->_currentPageNumber = $i;
$this->_currentPagePosition = $offset - $streamSize;
parent::setOffset($this->_pages[$i]['offset'] + $this->_pages[$i]['page']->getHeaderSize() + $this->_currentPagePosition);
break;
}
$streamSize += $this->_pages[$i]['page']->getPageSize();
}
}
