diff options
Diffstat (limited to 'libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ID3/Frame/ASPI.php')
-rw-r--r-- | libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ID3/Frame/ASPI.php | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ID3/Frame/ASPI.php b/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ID3/Frame/ASPI.php new file mode 100644 index 0000000..d51cc01 --- /dev/null +++ b/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ID3/Frame/ASPI.php @@ -0,0 +1,157 @@ +<?php +/** + * PHP Reader Library + * + * Copyright (c) 2008 The PHP Reader Project Workgroup. All rights reserved. + * + * 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 project workgroup 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. + * + * @package php-reader + * @subpackage ID3 + * @copyright Copyright (c) 2008 The PHP Reader Project Workgroup + * @license http://code.google.com/p/php-reader/wiki/License New BSD License + * @version $Id: ASPI.php 75 2008-04-14 23:57:21Z svollbehr $ + * @since ID3v2.4.0 + */ + +/**#@+ @ignore */ +require_once("ID3/Frame.php"); +/**#@-*/ + +/** + * Audio files with variable bit rates are intrinsically difficult to deal with + * in the case of seeking within the file. The <i>Audio seek point index</i> or + * ASPI frame makes seeking easier by providing a list a seek points within the + * audio file. The seek points are a fractional offset within the audio data, + * providing a starting point from which to find an appropriate point to start + * decoding. The presence of an ASPI frame requires the existence of a + * {@link ID3_Frame_TLEN} frame, indicating the duration of the file in + * milliseconds. There may only be one audio seek point index frame in a tag. + * + * @todo Data parsing and write support + * @package php-reader + * @subpackage ID3 + * @author Sven Vollbehr <svollbehr@gmail.com> + * @copyright Copyright (c) 2008 The PHP Reader Project Workgroup + * @license http://code.google.com/p/php-reader/wiki/License New BSD License + * @version $Rev: 75 $ + * @since ID3v2.4.0 + */ +final class ID3_Frame_ASPI extends ID3_Frame +{ + /** @var integer */ + private $_dataStart; + + /** @var integer */ + private $_dataLength; + + /** @var integer */ + private $_size; + + /** @var Array */ + private $_fractions = array(); + + /** + * Constructs the class with given parameters and parses object related data. + * + * @param Reader $reader The reader object. + * @param Array $options The options array. + */ + public function __construct($reader = null, &$options = array()) + { + parent::__construct($reader, $options); + + if ($reader === null) + throw new ID3_Exception("Write not supported yet"); + + $this->_dataStart = Transform::fromInt32BE(substr($this->_data, 0, 4)); + $this->_dataLength = Transform::fromInt32BE(substr($this->_data, 4, 4)); + $this->_size = Transform::fromInt16BE(substr($this->_data, 8, 2)); + + $bitsPerPoint = Transform::fromInt8($this->_data[10]); + /*for ($i = 0, $offset = 11; $i < $this->_size; $i++) { + if ($bitsPerPoint == 16) { + $this->_fractions[$i] = substr($this->_data, $offset, 2); + $offset += 2; + } else { + $this->_fractions[$i] = substr($this->_data, $offset, 1); + $offset ++; + } + }*/ + } + + /** + * Returns the byte offset from the beginning of the file. + * + * @return integer + */ + public function getDataStart() { return $this->_dataStart; } + + /** + * Sets the byte offset from the beginning of the file. + * + * @param integer $dataStart The offset. + */ + public function setDataStart($dataStart) { $this->_dataStart = $dataStart; } + + /** + * Returns the byte length of the audio data being indexed. + * + * @return integer + */ + public function getDataLength() { return $this->_dataLength; } + + /** + * Sets the byte length of the audio data being indexed. + * + * @param integer $dataLength The length. + */ + public function setDataLength($dataLength) + { + $this->_dataLength = $dataLength; + } + + /** + * Returns the number of index points in the frame. + * + * @return integer + */ + public function getSize() { return count($this->_fractions); } + + /** + * Returns the numerator of the fraction representing a relative position in + * the data or <var>false</var> if index not defined. The denominator is 2 + * to the power of b. + * + * @param integer $index The fraction numerator. + * @return integer + */ + public function getFractionAt($index) + { + if (isset($this->_fractions[$index])) + return $this->_fractions[$index]; + return false; + } +} |