diff options
Diffstat (limited to 'libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ID3/Frame/SYTC.php')
| -rw-r--r-- | libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ID3/Frame/SYTC.php | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ID3/Frame/SYTC.php b/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ID3/Frame/SYTC.php new file mode 100644 index 0000000..5673a4e --- /dev/null +++ b/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ID3/Frame/SYTC.php @@ -0,0 +1,161 @@ +<?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: SYTC.php 107 2008-08-03 19:09:16Z svollbehr $ + */ + +/**#@+ @ignore */ +require_once("ID3/Frame.php"); +require_once("ID3/Timing.php"); +/**#@-*/ + +/** + * For a more accurate description of the tempo of a musical piece, the + * <i>Synchronised tempo codes</i> frame might be used. + * + * The tempo data consists of one or more tempo codes. Each tempo code consists + * of one tempo part and one time part. The tempo is in BPM described with one + * or two bytes. If the first byte has the value $FF, one more byte follows, + * which is added to the first giving a range from 2 - 510 BPM, since $00 and + * $01 is reserved. $00 is used to describe a beat-free time period, which is + * not the same as a music-free time period. $01 is used to indicate one single + * beat-stroke followed by a beat-free period. + * + * The tempo descriptor is followed by a time stamp. Every time the tempo in the + * music changes, a tempo descriptor may indicate this for the player. All tempo + * descriptors must be sorted in chronological order. The first beat-stroke in + * a time-period is at the same time as the beat description occurs. There may + * only be one SYTC frame in each tag. + * + * @package php-reader + * @subpackage ID3 + * @author Sven Vollbehr <svollbehr@gmail.com> + * @author Ryan Butterfield <buttza@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: 107 $ + */ +final class ID3_Frame_SYTC extends ID3_Frame + implements ID3_Timing +{ + /** Describes a beat-free time period. */ + const BEAT_FREE = 0x00; + + /** Indicate one single beat-stroke followed by a beat-free period. */ + const SINGLE_BEAT = 0x01; + + /** @var integer */ + private $_format = ID3_Timing::MPEG_FRAMES; + + /** @var Array */ + private $_events = 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) + return; + + $offset = 0; + $this->_format = Transform::fromUInt8($this->_data[$offset++]); + while ($offset < strlen($this->_data)) { + $tempo = Transform::fromUInt8($this->_data[$offset++]); + if ($tempo == 0xff) + $tempo += Transform::fromUInt8($this->_data[$offset++]); + $this->_events + [Transform::fromUInt32BE(substr($this->_data, $offset, 4))] = $tempo; + $offset += 4; + } + ksort($this->_events); + } + + /** + * Returns the timing format. + * + * @return integer + */ + public function getFormat() { return $this->_format; } + + /** + * Sets the timing format. + * + * @see ID3_Timing + * @param integer $format The timing format. + */ + public function setFormat($format) { $this->_format = $format; } + + /** + * Returns the time-bpm tempo events. + * + * @return Array + */ + public function getEvents() { return $this->_events; } + + /** + * Sets the time-bpm tempo events. + * + * @param Array $events The time-bpm tempo events. + */ + public function setEvents($events) + { + $this->_events = $events; + ksort($this->_events); + } + + /** + * Returns the frame raw data. + * + * @return string + */ + public function __toString() + { + $data = Transform::toUInt8($this->_format); + foreach ($this->_events as $timestamp => $tempo) { + if ($tempo >= 0xff) + $data .= Transform::toUInt8(0xff) . Transform::toUInt8($tempo - 0xff); + else + $data .= Transform::toUInt8($tempo); + $data .= Transform::toUInt32BE($timestamp); + } + parent::setData($data); + return parent::__toString(); + } +} |