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PHP Script | 2010-05-19 | 17KB | 381 lines

<?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: * * <li>Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * <li>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. * <li>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 ISO 14496 * @copyright Copyright (c) 2008 PHP Reader Project Workgroup * @license http://code.google.com/p/php-reader/wiki/License New BSD License * @version $Id: ISO14496.php 101 2008-05-13 20:28:13Z svollbehr $ */ /**#@+ @ignore */ require_once("Reader.php"); require_once("ISO14496/Box.php"); /**#@-*/ /** * This class represents a file in ISO base media file format as described in * ISO/IEC 14496 Part 12 standard. * * The ISO Base Media File Format is designed to contain timed media information * for a presentation in a flexible, extensible format that facilitates * interchange, management, editing, and presentation of the media. This * presentation may be local to the system containing the presentation, or may * be via a network or other stream delivery mechanism. * * The file structure is object-oriented; a file can be decomposed into * constituent objects very simply, and the structure of the objects inferred * directly from their type. The file format is designed to be independent of * any particular network protocol while enabling efficient support for them in * general. * * The ISO Base Media File Format is a base format for media file formats. * * * An overall view of the normal encapsulation structure is provided in the * following table. * * The table shows those boxes that may occur at the top-level in the left-most * column; indentation is used to show possible containment. Thus, for example, * a {@link ISO14496_Box_TKHD Track Header Box} is found in a * {@link ISO14496_Box_TRAK Track Box}, which is found in a * {@link ISO14496_Box_MOOV Movie Box}. Not all boxes need be used in all files; * the mandatory boxes are marked with bold typeface. See the description of the * individual boxes for a discussion of what must be assumed if the optional * boxes are not present. * * User data objects shall be placed only in {@link ISO14496_Box_MOOV Movie} or * {@link ISO14496_Box_TRAK Track Boxes}, and objects using an extended type may * be placed in a wide variety of containers, not just the top level. * * <ul> * <li>ftyp -- {@link ISO14496_Box_FTYP File Type Box}; file type * and compatibility * <li>pdin -- {@link ISO14496_Box_PDIN Progressive Download Information * Box} * <li>moov -- {@link ISO14496_Box_MOOV Movie Box}; container for * all the metadata * <ul> * <li>mvhd -- {@link ISO14496_Box_MVHD Movie Header Box}; * overall declarations * <li>trak -- {@link ISO14496_Box_TRAK Track Box}; container * for an individual track or stream * <ul> * <li>tkhd -- {@link ISO14496_Box_TKHD Track Header Box}; * overall information about the track * <li>tref -- {@link ISO14496_Box_TREF Track Reference Box} * <li>edts -- {@link ISO14496_Box_EDTS Edit Box} * <ul> * <li>elst -- {@link ISO14496_Box_ELST Edit List Box} * </ul> * <li>mdia -- {@link ISO14496_Box_MDIA Media Box} * <ul> * <li>mdhd -- {@link ISO14496_Box_MDHD Media Header Box}; * overall information about the media * <li>hdlr -- {@link ISO14496_Box_HDLR Handler Reference * Box}; declares the media type * <li>minf -- {@link ISO14496_Box_MINF Media Information * Box} * <ul> * <li>vmhd -- {@link ISO14496_Box_VMHD Video Media Header Box}; * overall information (video track only) * <li>smhd -- {@link ISO14496_Box_SMHD Sound Media Header Box}; * overall information (sound track only) * <li>hmhd -- {@link ISO14496_Box_HMHD Hint Media Header Box}; * overall information (hint track only) * <li>nmhd -- {@link ISO14496_Box_NMHD Null Media Header Box}; * overall information (some tracks only) * <li>dinf -- {@link ISO14496_Box_DINF Data Information * Box} * <ul> * <li>dref -- {@link ISO14496_Box_DREF Data Reference * Box} * </ul> * <li>stbl -- {@link ISO14496_Box_STBL Sample Table Box} * <ul> * <li>stsd -- {@link ISO14496_Box_STSD Sample Descriptions * Box} * <li>stts -- {@link ISO14496_Box_STTS Decoding Time To * Sample Box} * <li>ctts -- {@link ISO14496_Box_CTTS Composition Time To Sample * Box} * <li>stsc -- {@link ISO14496_Box_STSC Sample To Chunk * Box} * <li>stsz -- {@link ISO14496_Box_STSZ Sample Size Box} * <li>stz2 -- {@link ISO14496_Box_STZ2 Compact Sample Size * Box} * <li>stco -- {@link ISO14496_Box_STCO Chunk Offset * Box}; 32-bit * <li>co64 -- {@link ISO14496_Box_CO64 Chunk Ooffset Box}; * 64-bit * <li>stss -- {@link ISO14496_Box_STSS Sync Sample Table Box} * <li>stsh -- {@link ISO14496_Box_STSH Shadow Sync Sample Table * Box} * <li>padb -- {@link ISO14496_Box_PADB Padding Bits Box} * <li>stdp -- {@link ISO14496_Box_STDP Sample Degradation Priority * Box} * <li>sdtp -- {@link ISO14496_Box_SDTP Independent and Disposable * Samples Box} * <li>sbgp -- {@link ISO14496_Box_SBGP Sample To Group Box} * <li>sgpd -- {@link ISO14496_Box_SGPD Sample Group * Description} * <li>subs -- {@link ISO14496_Box_SUBS Sub-Sample Information * Box} * </ul> * </ul> * </ul> * </ul> * <li>mvex -- {@link ISO14496_Box_MVEX Movie Extends Box} * <ul> * <li>mehd -- {@link ISO14496_Box_MEHD Movie Extends Header Box} * <li>trex -- {@link ISO14496_Box_TREX Track Extends Box} * </ul> * <li>ipmc -- {@link ISO14496_Box_IPMC IPMP Control Box} * </ul> * <li>moof -- {@link ISO14496_Box_MOOF Movie Fragment Box} * <ul> * <li>mfhd -- {@link ISO14496_Box_MFHD Movie Fragment Header * Box} * <li>traf -- {@link ISO14496_Box_TRAF Track Fragment Box} * <ul> * <li>tfhd -- {@link ISO14496_Box_TFHD Track Fragment Header * Box} * <li>trun -- {@link ISO14496_Box_TRUN Track Fragment Run} * <li>sdtp -- {@link ISO14496_Box_SDTP Independent and Disposable * Samples} * <li>sbgp -- {@link ISO14496_Box_SBGP !SampleToGroup Box} * <li>subs -- {@link ISO14496_Box_SUBS Sub-Sample Information Box} * </ul> * </ul> * <li>mfra -- {@link ISO14496_Box_MFRA Movie Fragment Random Access Box} * <ul> * <li>tfra -- {@link ISO14496_Box_TFRA Track Fragment Random Access * Box} * <li>mfro -- {@link ISO14496_Box_MFRO Movie Fragment Random Access * Offset Box} * </ul> * <li>mdat -- {@link ISO14496_Box_MDAT Media Data Box} * <li>free -- {@link ISO14496_Box_FREE Free Space Box} * <li>skip -- {@link ISO14496_Box_SKIP Free Space Box} * <ul> * <li>udta -- {@link ISO14496_Box_UDTA User Data Box} * <ul> * <li>cprt -- {@link ISO14496_Box_CPRT Copyright Box} * </ul> * </ul> * <li>meta -- {@link ISO14496_Box_META The Meta Box} * <ul> * <li>hdlr -- {@link ISO14496_Box_HDLR Handler Reference Box}; * declares the metadata type * <li>dinf -- {@link ISO14496_Box_DINF Data Information Box} * <ul> * <li>dref -- {@link ISO14496_Box_DREF Data Reference Box}; declares * source(s) of metadata items * </ul> * <li>ipmc -- {@link ISO14496_Box_IPMC IPMP Control Box} * <li>iloc -- {@link ISO14496_Box_ILOC Item Location Box} * <li>ipro -- {@link ISO14496_Box_IPRO Item Protection Box} * <ul> * <li>sinf -- {@link ISO14496_Box_SINF Protection Scheme Information * Box} * <ul> * <li>frma -- {@link ISO14496_Box_FRMA Original Format Box} * <li>imif -- {@link ISO14496_Box_IMIF IPMP Information Box} * <li>schm -- {@link ISO14496_Box_SCHM Scheme Type Box} * <li>schi -- {@link ISO14496_Box_SCHI Scheme Information Box} * </ul> * </ul> * <li>iinf -- {@link ISO14496_Box_IINF Item Information Box} * <ul> * <li>infe -- {@link ISO14496_Box_INFE Item Information Entry Box} * </ul> * <li>xml -- {@link ISO14496_Box_XML XML Box} * <li>bxml -- {@link ISO14496_Box_BXML Binary XML Box} * <li>pitm -- {@link ISO14496_Box_PITM Primary Item Reference Box} * </ul> * </ul> * * There are two non-standard extensions to the ISO 14496 standard that add the * ability to include file meta information. Both the boxes reside under * moov.udta.meta. * * <ul> * <li>moov -- {@link ISO14496_Box_MOOV Movie Box}; container for * all the metadata * <li>udta -- {@link ISO14496_Box_UDTA User Data Box} * <li>meta -- {@link ISO14496_Box_META The Meta Box} * <ul> * <li>ilst -- {@link ISO14496_Box_ILST The iTunes/iPod Tag Container * Box} * <li>id32 -- {@link ISO14496_Box_ID32 The ID3v2 Box} * </ul> * </ul> * * @package php-reader * @subpackage ISO 14496 * @author Sven Vollbehr <svollbehr@gmail.com> * @copyright Copyright (c) 2008 PHP Reader Project Workgroup * @license http://code.google.com/p/php-reader/wiki/License New BSD License * @version $Rev: 101 $ */ class ISO14496 extends ISO14496_Box { /** @var string */ private $_filename; /** * Constructs the ISO14496 class with given file and options. * * The following options are currently recognized: * o base -- Indicates that only boxes with the given base path are parsed * from the ISO base media file. Parsing all boxes can possibly have a * significant impact on running time. Base path is a list of nested boxes * separated by a dot. * o readonly -- Indicates that the file is read from a temporary location * or another source it cannot be written back to. The use of base option * implies readonly option. * * @param string $filename The path to the file or file descriptor of an * opened file. * @param Array $options The options array. */ public function __construct($filename, $options = array()) { $this->_reader = new Reader($this->_filename = $filename); if (isset($options["base"])) $options["readonly"] = true; $this->setOptions($options); $this->setOffset(0); $this->setSize($this->_reader->getSize()); $this->setType("file"); $this->setContainer(true); $this->constructBoxes(); } /** * Writes the changes back to the original media file. * * Please note: currently the method writes only ID32 and ILST boxes to * moov.udta.meta. Changes to any other box are discarded. Write * operation will overwrite moov.udta, if found. */ public function write() { if (!isset($this->moov->udta->meta->ilst) && !isset($this->moov->udta->meta->id32)) throw new ISO14496_Exception("Nothing to write"); if ($this->getOption("readonly", false) !== false) throw new ISO14496_Exception("File is read only"); if (($fd = fopen($this->_filename, file_exists ($this->_filename) ? "r+b" : "wb")) === false) throw new ISO14496_Exception ("Unable to open file for writing: " . $filename); $this->moov->udta->meta->hdlr->setHandlerType("mdir"); /* Calculate start position */ $mark = ($this->moov->udta->getOffset() > 0 ? $this->moov->udta->getOffset() : $this->moov->getOffset() + $this->moov->getSize()); /* Calculate file size */ fseek($fd, 0, SEEK_END); $oldFileSize = ftell($fd); $newFileSize = $oldFileSize - ($this->moov->udta->getOffset() > 0 ? $this->moov->udta->getSize() : 0) - (isset($this->moov->udta->meta->free) ? $this->moov->udta->meta->free->getSize() : 0) + strlen($this->moov->udta); /* Calculate free space size */ if ($oldFileSize < $newFileSize) { // Add free space to the file calculated using the following logaritmic // equation: log(0.2(x + 10)), ranging from 1k to 9k given the file size // of 0..4G $this->moov->udta->meta->free->setSize (ceil(log(0.2 * ($newFileSize / 1024 + 10), 10) * 1024)); ftruncate($fd, $newFileSize += $this->moov->udta->meta->free->getSize()); // Move data to the end of the file for ($i = 1, $cur = $oldFileSize; $cur > $mark; $cur -= 1024, $i++) { fseek($fd, -(($i * 1024) + ($excess = $cur - 1024 > $mark ? 0 : $cur - $mark - 1024) + ($newFileSize - $oldFileSize)), SEEK_END); $buffer = fread($fd, 1024); fseek($fd, -(($i * 1024) + $excess), SEEK_END); fwrite($fd, $buffer, 1024); } // Update stco/co64 to correspond the data move foreach ($this->moov->getBoxesByIdentifier("trak") as $trak) { $chunkOffsetBox = (isset($trak->mdia->minf->stbl->stco) ? $trak->mdia->minf->stbl->stco : $trak->mdia->minf->stbl->co64); $chunkOffsetTable = $chunkOffsetBox->getChunkOffsetTable(); $chunkOffsetTableCount = count($chunkOffsetTable); $chunkOffsetDelta = $newFileSize - $oldFileSize; for ($i = 1; $i <= $chunkOffsetTableCount; $i++) $chunkOffsetTable[$i] += $chunkOffsetDelta; $chunkOffsetBox->setChunkOffsetTable($chunkOffsetTable); fseek($fd, $chunkOffsetBox->getOffset()); fwrite($fd, $chunkOffsetBox, $chunkOffsetBox->getSize()); } } else $this->moov->udta->meta->free->setSize($oldFileSize - $newFileSize); /* Update the target box */ fseek($fd, $mark); $this->moov->udta->setSize(fwrite($fd, $this->moov->udta)); /* Update the parent box */ fseek($fd, $this->moov->getOffset()); fwrite($fd, Transform::toUInt32BE($this->moov->getSize())); fclose($fd); } /** * Returns the raw data of the ISO14496 file. * * @return string */ public function __toString($data = "") { if ($this->isContainer()) foreach ($this->getBoxes() as $name => $boxes) foreach ($boxes as $box) $data .= $box; return $data; } }