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Diffstat (limited to 'libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ASF/Object/Index.php')
| -rw-r--r-- | libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ASF/Object/Index.php | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ASF/Object/Index.php b/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ASF/Object/Index.php new file mode 100644 index 0000000..6ce63ca --- /dev/null +++ b/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ASF/Object/Index.php @@ -0,0 +1,185 @@ +<?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 ASF + * @copyright Copyright (c) 2008 The PHP Reader Project Workgroup + * @license http://code.google.com/p/php-reader/wiki/License New BSD License + * @version $Id: Index.php 108 2008-09-05 17:00:05Z svollbehr $ + */ + +/**#@+ @ignore */ +require_once("ASF/Object.php"); +/**#@-*/ + +/** + * This top-level ASF object supplies the necessary indexing information for an + * ASF file that contains more than just a plain script-audio-video combination. + * It includes stream-specific indexing information based on an adjustable index + * entry time interval. The index is designed to be broken into blocks to + * facilitate storage that is more space-efficient by using 32-bit offsets + * relative to a 64-bit base. That is, each index block has a full 64-bit offset + * in the block header that is added to the 32-bit offsets found in each index + * entry. If a file is larger than 2^32 bytes, then multiple index blocks can be + * used to fully index the entire large file while still keeping index entry + * offsets at 32 bits. + * + * Indices into the <i>Index Object</i> are in terms of presentation times. The + * corresponding <i>Offset</i> field values of the <i>Index Entry</i> byte + * offsets that, when combined with the <i>Block Position</i> value of the + * <i>Index Block</i>, indicate the starting location in bytes of an ASF Data + * Packet relative to the start of the first ASF Data Packet in the file. + * + * An offset value of 0xFFFFFFFF is used to indicate an invalid offset value. + * Invalid offsets signify that this particular index entry does not identify a + * valid indexible point. Invalid offsets may occur for the initial index + * entries of a digital media stream whose first ASF Data Packet has a non-zero + * send time. Invalid offsets may also occur in the case where a digital media + * stream has a large gap in the presentation time of successive objects. + * + * The <i>Index Object</i> is not recommended for use with files where the + * <i>Send Time</i> of the first <i>Data Packet</i> within the <i>Data + * Object</i> has a <i>Send Time</i> value significantly greater than zero + * (otherwise the index itself will be sparse and inefficient). + * + * Any ASF file containing an <i>Index Object</i> does also contain an <i>Index + * Parameters Object</i> in its {@link ASF_Object_Header ASF Header}. + * + * @package php-reader + * @subpackage ASF + * @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: 108 $ + */ +final class ASF_Object_Index extends ASF_Object +{ + /** + * Indicates that the index type is Nearest Past Data Packet. The Nearest + * Past Data Packet indexes point to the data packet whose presentation time + * is closest to the index entry time. + */ + const NEAREST_PAST_DATA_PACKET = 1; + + /** + * Indicates that the index type is Nearest Past Media. The Nearest Past + * Object indexes point to the closest data packet containing an entire object + * or first fragment of an object. + */ + const NEAREST_PAST_MEDIA = 2; + + /** + * Indicates that the index type is Nearest Past Cleanpoint. The Nearest Past + * Cleanpoint indexes point to the closest data packet containing an entire + * object (or first fragment of an object) that has the Cleanpoint Flag set. + * + * Nearest Past Cleanpoint is the most common type of index. + */ + const NEAREST_PAST_CLEANPOINT = 3; + + /** @var integer */ + private $_indexEntryTimeInterval; + + /** @var Array */ + private $_indexSpecifiers = array(); + + /** @var Array */ + private $_indexBlocks = array(); + + /** + * Constructs the class with given parameters and reads object related data + * from the ASF file. + * + * @param Reader $reader The reader object. + * @param Array $options The options array. + */ + public function __construct($reader, &$options = array()) + { + parent::__construct($reader, $options); + + $this->_indexEntryTimeInterval = $this->_reader->readUInt32LE(); + $indexSpecifiersCount = $this->_reader->readUInt16LE(); + $indexBlocksCount = $this->_reader->readUInt32LE(); + for ($i = 0; $i < $indexSpecifiersCount; $i++) + $this->_indexSpecifiers[] = array + ("streamNumber" => $this->_reader->readUInt16LE(), + "indexType" => $this->_reader->readUInt16LE()); + for ($i = 0; $i < $indexBlocksCount; $i++) { + $indexEntryCount = $this->_reader->readUInt32LE(); + $blockPositions = array(); + for ($i = 0; $i < $indexSpecifiersCount; $i++) + $blockPositions[] = $this->_reader->readInt64LE(); + $offsets = array(); + for ($i = 0; $i < $indexSpecifiersCount; $i++) + $offsets[] = $this->_reader->readUInt32LE(); + $this->_indexBlocks[] = array + ("blockPositions" => $blockPositions, + "indexEntryOffsets" => $offsets); + } + } + + /** + * Returns the time interval between each index entry in ms. + * + * @return integer + */ + public function getIndexEntryTimeInterval() + { + return $this->_indexEntryTimeInterval; + } + + /** + * Returns an array of index specifiers. Each entry consists of the following + * keys. + * + * o streamNumber -- Specifies the stream number that the <i>Index + * Specifiers</i> refer to. Valid values are between 1 and 127. + * + * o indexType -- Specifies the type of index. + * + * @return Array + */ + public function getIndexSpecifiers() { return $this->_indexSpecifiers; } + + /** + * Returns an array of index entries. Each entry consists of the following + * keys. + * + * o blockPositions -- Specifies a list of byte offsets of the beginnings of + * the blocks relative to the beginning of the first Data Packet (for + * example, the beginning of the Data Object + 50 bytes). + * + * o indexEntryOffsets -- Specifies the offset. An offset value of + * 0xffffffff indicates an invalid offset value. + * + * @return Array + */ + public function getIndexBlocks() { return $this->_indexBlocks; } +} |