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Add support for MPEG-1/2 Audio (ISO/IEC 11172-3 and ISO/IEC 13818-3 respectively)

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git-svn-id: http://php-reader.googlecode.com/svn/trunk@114 51a70ab9-7547-0410-9469-37e369ee0574
This commit is contained in:
svollbehr
2008-12-03 21:49:43 +00:00
parent 07a5e6bd3c
commit edc63529da
10 changed files with 2090 additions and 8 deletions
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3
src/ID3/Object.php
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@@ -63,8 +63,7 @@ abstract class ID3_Object
private $_options; private $_options;
/** /**
* Constructs the class with given parameters and reads object related data * Constructs the class with given parameters.
* from the ID3v2 tag.
* *
* @param Reader $reader The reader object. * @param Reader $reader The reader object.
* @param Array $options The options array. * @param Array $options The options array.

353
src/MPEG/Audio.php Normal file
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@@ -0,0 +1,353 @@
<?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 MPEG
* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
* @license http://code.google.com/p/php-reader/wiki/License New BSD License
* @version $Id: MPEG.php 1 2008-07-06 10:43:41Z rbutterfield $
*/
/**#@+ @ignore */
require_once("MPEG/Audio/Object.php");
require_once("MPEG/Audio/Frame.php");
/**#@-*/
/**
* This class represents an MPEG Audio file as described in ISO/IEC 11172-3 and
* ISO/IEC 13818-3 standards.
*
* Non-standard VBR header extensions or namely XING, VBRI and LAME headers are
* supported.
*
* This class is optimized for fast determination of the play duration of the
* file and hence uses lazy data reading mode by default. In this mode the
* actual frames and frame data are only read when referenced directly. You may
* change this behaviour by giving an appropriate option to the constructor.
*
* @package php-reader
* @subpackage MPEG
* @author Ryan Butterfield <buttza@gmail.com>
* @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: 1 $
*/
final class MPEG_Audio extends MPEG_Audio_Object
{
/** @var integer */
private $_bytes;
/** @var Array */
private $_frames = array();
/** @var MPEG_Audio_XINGHeader */
private $_xingHeader = null;
/** @var MPEG_Audio_LAMEHeader */
private $_lameHeader = null;
/** @var MPEG_Audio_VBRIHeader */
private $_vbriHeader = null;
/** @var integer */
private $_cumulativeBitrate = 0;
/** @var integer */
private $_cumulativePlayDuration = 0;
/** @var integer */
private $_estimatedBitrate = 0;
/** @var integer */
private $_estimatedPlayDuration = 0;
/** @var integer */
private $_lastFrameOffset = false;
/**
* Constructs the MPEG_Audio class with given file and options.
*
* The following options are currently recognized:
* o readmode -- Can be one of full or lazy and determines when the read of
* frames and their data happens. When in full mode the data is read
* automatically during the instantiation of the frame and all the frames
* are read during the instantiation of this class. While this allows
* faster validation and data fetching, it is unnecessary in terms of
* determining just the play duration of the file. Defaults to lazy.
*
* o estimatePrecision -- Only applicaple with lazy read mode to determine
* the precision of play duration estimate. This precision is equal to how
* many frames are read before fixing the average bitrate that is used to
* calculate the play duration estimate of the whole file. Each frame adds
* about 0.1-0.2ms to the processing of the file. Defaults to 1000.
*
* When in lazy data reading mode it is first checked whether a VBR header is
* found in a file. If so, the play duration is calculated based no its data
* and no further frames are read from the file. If no VBR header is found,
* frames up to estimatePrecision are read to calculate an average bitrate.
*
* Hence, only zero or <var>estimatePrecision</var> number of frames are read
* in lazy data reading mode. The rest of the frames are read automatically
* when directly referenced, ie the data is read when it is needed.
*
* @param string|Reader $filename The path to the file, file descriptor of an
* opened file, or {@link Reader} instance.
* @param Array $options The options array.
*/
public function __construct($filename, $options = array())
{
if ($filename instanceof Reader)
$reader = &$filename;
else
$reader = new Reader($filename);
parent::__construct($reader, $options);
$offset = $this->_reader->getOffset();
$this->_bytes = $this->_reader->getSize();
/* Skip ID3v1 tag */
$this->_reader->setOffset(-128);
if ($this->_reader->read(3) == "TAG")
$this->_bytes -= 128;
$this->_reader->setOffset($offset);
/* Skip ID3v2 tag */
if ($this->_reader->readString8(3) == "ID3") {
require_once("ID3/Header.php");
$header = new ID3_Header($this->_reader);
$this->_reader->skip
($header->getSize() + ($header->hasFlag(ID3_Header::FOOTER) ? 10 : 0));
}
else
$this->_reader->setOffset($offset);
$offset = $this->_reader->getOffset();
/* Check for VBR headers */
$firstFrame = new MPEG_Audio_Frame($this->_reader, $options);
$this->_reader->setOffset
($offset + 4 + self::$sidesizes
[$firstFrame->getFrequencyType()][$firstFrame->getMode()]);
if (($xing = $this->_reader->readString8(4)) == "Xing" || $xing == "Info") {
require_once("MPEG/Audio/XINGHeader.php");
$this->_xingHeader = new MPEG_Audio_XINGHeader($this->_reader, $options);
if ($this->_reader->readString8(4) == "LAME") {
require_once("MPEG/Audio/LAMEHeader.php");
$this->_lameHeader =
new MPEG_Audio_LAMEHeader($this->_reader, $options);
}
}
$this->_reader->setOffset($offset + 4 + 32);
if ($this->_reader->readString8(4) == "VBRI") {
require_once("MPEG/Audio/VBRIHeader.php");
$this->_vbriHeader = new MPEG_Audio_VBRIHeader($this->_reader, $options);
}
$this->_reader->setOffset($offset);
/* Read necessary frames */
if ($this->getOption("readmode", "lazy") == "lazy") {
if (($header = $this->_xingHeader) !== null ||
($header = $this->_vbriHeader) !== null) {
$this->_estimatedPlayDuration = $header->getFrames() *
$firstFrame->getSamples() / $firstFrame->getSamplingFrequency();
if ($this->_lameHeader !== null) {
$this->_estimatedBitrate = $this->_lameHeader->getBitrate();
if ($this->_estimatedBitrate == 255)
$this->_estimatedBitrate = round
(($this->_lameHeader->getMusicLength()) /
(($header->getFrames() * $firstFrame->getSamples()) /
$firstFrame->getSamplingFrequency()) / 1000 * 8);
}
else
$this->_estimatedBitrate = ($this->_bytes - $offset) /
$this->_estimatedPlayDuration / 1000 * 8;
}
else {
$this->_readFrames($this->getOption("estimatePrecision", 1000));
$this->_estimatedBitrate =
$this->_cumulativeBitrate / count($this->_frames);
$this->_estimatedPlayDuration =
($this->_bytes - $offset) / ($this->_estimatedBitrate * 1000 / 8);
}
}
else {
$this->_readFrames();
$this->_estimatedBitrate =
$this->_cumulativeBitrate / count($this->_frames);
$this->_estimatedPlayDuration = $this->_cumulativePlayDuration;
}
}
/**
* Returns the bitrate estimate. This value is either fetched from one of the
* headers or calculated based on the read frames.
*
* @return integer
*/
public function getBitrateEstimate()
{
return $this->_estimatedBitrate;
}
/**
* For variable bitrate files this method returns the exact average bitrate of
* the whole file.
*
* @return integer
*/
public function getBitrate()
{
if ($this->getOption("readmode", "lazy") == "lazy")
$this->_readFrames();
return $this->_cumulativeBitrate / count($this->_frames);
}
/**
* Returns the playtime estimate, in seconds.
*
* @return integer
*/
public function getLengthEstimate()
{
return $this->_estimatedPlayDuration;
}
/**
* Returns the exact playtime in seconds. In lazy reading mode the frames are
* read from the file the first time you call this method to get the exact
* playtime of the file.
*
* @return integer
*/
public function getLength()
{
if ($this->getOption("readmode", "lazy") == "lazy")
$this->_readFrames();
return $this->_cumulativePlayDuration;
}
/**
* Returns the playtime estimate as a string in the form of
* [hours]:minutes:seconds.milliseconds.
*
* @param integer $seconds The playtime in seconds.
* @return string
*/
public function getFormattedLengthEstimate()
{
return $this->_formatTime($this->getLengthEstimate());
}
/**
* Returns the exact playtime given in seconds as a string in the form of
* [hours]:minutes:seconds.milliseconds. In lazy reading mode the frames are
* read from the file the first time you call this method to get the exact
* playtime of the file.
*
* @param integer $seconds The playtime in seconds.
* @return string
*/
public function getFormattedLength()
{
return $this->_formatTime($this->getLength());
}
/**
* Formats given time in seconds into the form of
* [hours]:minutes:seconds.milliseconds.
*
* @param integer $seconds The time to format, in seconds
* @return string
*/
private function _formatTime($seconds)
{
$milliseconds = round(($seconds - floor($seconds)) * 1000);
$seconds = floor($seconds);
$minutes = floor($seconds / 60);
$hours = floor($minutes / 60);
return
($minutes > 0 ?
($hours > 0 ? $hours . ":" .
str_pad($minutes % 60, 2, "0", STR_PAD_LEFT) : $minutes % 60) . ":" .
str_pad($seconds % 60, 2, "0", STR_PAD_LEFT) : $seconds % 60) . "." .
str_pad($milliseconds, 3, "0", STR_PAD_LEFT);
}
/**
* Returns all the frames of the audio bitstream as an array. In lazy reading
* mode the frames are read from the file the first time you call this method.
*
* @return Array
*/
public function getFrames()
{
if ($this->getOption("readmode", "lazy") == "lazy" &&
$this->_frames === false) {
$this->_readFrames();
}
return $this->_frames;
}
/**
* Reads frames up to given limit. If called subsequently the method continues
* after the last frame read in the last call, again to read up to the limit
* or just the rest of the frames.
*
* @param integer $limit The maximum number of frames read from the bitstream
*/
private function _readFrames($limit = false)
{
if ($this->_lastFrameOffset !== false)
$this->_reader->setOffset($this->_lastFrameOffset);
for ($i = 0; $this->_reader->getOffset() < $this->_bytes; $i++) {
$frame = new MPEG_Audio_Frame($this->_reader, $options);
$this->_cumulativePlayDuration +=
(double)($frame->getLength() / ($frame->getBitrate() * 1000 / 8));
$this->_cumulativeBitrate += $frame->getBitrate();
$this->_frames[] = $frame;
if ($limit !== false && $i == $limit) {
$this->_lastFrameOffset = $this->_reader->getOffset();
break;
}
}
}
}

507
src/MPEG/Audio/Frame.php Normal file
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@@ -0,0 +1,507 @@
<?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 MPEG
* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
* @license http://code.google.com/p/php-reader/wiki/License New BSD License
* @version $Id: Frame.php 1 2008-07-06 10:43:41Z rbutterfield $
*/
/**#@+ @ignore */
require_once("Reader.php");
require_once("Twiddling.php");
require_once("MPEG/Audio/Object.php");
/**#@-*/
/**
* This class represents an MPEG Audio frame as described in ISO/IEC 11172-3 and
* ISO/IEC 13818-3 standards.
*
* To accommodate fast header processing the error checking data and the audio
* data are lazy fetch by default. You can change this behaviour by giving a
* proper option to the {@link MPEG_Audio} class.
*
* @package php-reader
* @subpackage MPEG
* @author Ryan Butterfield <buttza@gmail.com>
* @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: 1 $
*/
class MPEG_Audio_Frame extends MPEG_Audio_Object
{
/**
* The bitrate lookup table. The table has the following format.
*
* <code>
* array (
* SAMPLING_FREQUENCY_HIGH | SAMPLING_FREQUENCY_LOW => array (
* LAYER_ONE | LAYER_TWO | LAYER_TREE => array ( <bitrates> )
* )
* )
* </code>
*
* @var Array
*/
private static $bitrates = array (
self::SAMPLING_FREQUENCY_HIGH => array (
self::LAYER_ONE => array (
1 => 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448
),
self::LAYER_TWO => array (
1 => 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384
),
self::LAYER_THREE => array (
1 => 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320
)
),
self::SAMPLING_FREQUENCY_LOW => array (
self::LAYER_ONE => array (
1 => 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256
),
self::LAYER_TWO => array (
1 => 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160
),
self::LAYER_THREE => array (
1 => 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160
)
)
);
/**
* Sample rate lookup table. The table has the following format.
*
* <code>
* array (
* LAYER_ONE | LAYER_TWO | LAYER_TREE => array ( <sample rates> )
* )
* </code>
*
* @var Array
*/
private static $samplingFrequencies = array (
self::VERSION_ONE => array (44100, 48000, 32000),
self::VERSION_TWO => array (22050, 24000, 16000),
self::VERSION_TWO_FIVE => array (11025, 12000, 8000)
);
/**
* Samples per frame lookup table. The table has the following format.
*
* <code>
* array (
* SAMPLING_FREQUENCY_HIGH | SAMPLING_FREQUENCY_LOW => array (
* LAYER_ONE | LAYER_TWO | LAYER_TREE => <sample count>
* )
* )
* </code>
*
* @var Array
*/
private static $samples = array (
self::SAMPLING_FREQUENCY_HIGH => array (
self::LAYER_ONE => 384,
self::LAYER_TWO => 1152,
self::LAYER_THREE => 1152),
self::SAMPLING_FREQUENCY_LOW => array (
self::LAYER_ONE => 384,
self::LAYER_TWO => 1152,
self::LAYER_THREE => 576));
/**
* Coefficient lookup table. The table has the following format.
*
* <code>
* array (
* SAMPLING_FREQUENCY_HIGH | SAMPLING_FREQUENCY_LOW => array (
* LAYER_ONE | LAYER_TWO | LAYER_TREE => array ( <coefficient> )
* )
* )
* </code>
*
* @var Array
*/
private static $coefficients = array (
self::SAMPLING_FREQUENCY_HIGH => array (
self::LAYER_ONE => 12, self::LAYER_TWO => 144, self::LAYER_THREE => 144
),
self::SAMPLING_FREQUENCY_LOW => array (
self::LAYER_ONE => 12, self::LAYER_TWO => 144, self::LAYER_THREE => 72
)
);
/**
* Slot size per layer lookup table. The table has the following format.
*
* <code>
* array (
* LAYER_ONE | LAYER_TWO | LAYER_TREE => <size>
* )
* </code>
*
*
* @var Array
*/
private static $slotsizes = array (
self::LAYER_ONE => 4, self::LAYER_TWO => 1, self::LAYER_THREE => 1
);
/** @var integer */
private $_offset;
/** @var integer */
private $_version;
/** @var integer */
private $_frequencyType;
/** @var integer */
private $_layer;
/** @var integer */
private $_redundancy;
/** @var integer */
private $_bitrate;
/** @var integer */
private $_samplingFrequency;
/** @var integer */
private $_padding;
/** @var integer */
private $_mode;
/** @var integer */
private $_modeExtension;
/** @var integer */
private $_copyright;
/** @var integer */
private $_original;
/** @var integer */
private $_emphasis;
/** @var integer */
private $_length;
/** @var integer */
private $_samples;
/** @var integer */
private $_crc = false;
/** @var string */
private $_data = false;
/**
* Constructs the class with given parameters and reads object related data
* from the MPEG frame.
*
* @param Reader $reader The reader object.
* @param Array $options Array of options.
*/
public function __construct($reader, &$options = array())
{
parent::__construct($reader, $options);
$this->_offset = $this->_reader->getOffset();
$header = Transform::fromUInt32BE($this->_reader->read(4));
$this->_version = Twiddling::getValue($header, 19, 20);
$this->_frequencyType = Twiddling::testBit($header, 19);
$this->_layer = Twiddling::getValue($header, 17, 18);
$this->_redundancy = !Twiddling::testBit($header, 16);
$this->_bitrate = isset
(self::$bitrates[$this->_frequencyType][$this->_layer]
[$index = Twiddling::getValue($header, 12, 15)]) ?
self::$bitrates[$this->_frequencyType][$this->_layer][$index] : false;
$this->_samplingFrequency = isset
(self::$samplingFrequencies[$this->_version]
[$index = Twiddling::getValue($header, 10, 11)]) ?
self::$samplingFrequencies[$this->_version][$index] : false;
$this->_padding = Twiddling::testBit($header, 9);
$this->_mode = Twiddling::getValue($header, 6, 7);
$this->_modeExtension = Twiddling::getValue($header, 4, 5);
$this->_copyright = Twiddling::testBit($header, 3);
$this->_original = Twiddling::testBit($header, 2);
$this->_emphasis = Twiddling::getValue($header, 0, 1);
$this->_length = (int)
((self::$coefficients[$this->_frequencyType][$this->_layer] *
($this->_bitrate * 1000) / $this->_samplingFrequency) +
($this->_padding ? 1 : 0)) * self::$slotsizes[$this->_layer];
$this->_samples = self::$samples[$this->_frequencyType][$this->_layer];
if ($this->getOption("readmode", "lazy") == "lazy")
$this->_reader->skip($this->_length - 4);
else { // full
$this->_readCrc();
$this->_readData();
}
}
/**
* Returns the version identifier of the algorithm.
*
* @see VERSION_ONE, VERSION_TWO, VERSION_TWO_FIVE
* @return integer
*/
public function getVersion() { return $this->_version; }
/**
* Returns the sampling frequency type. This can be one of the following
* values.
*
* o <b>{@link SAMPLING_FREQUENCY_HIGH}</b> -- Higher Sampling Frequency
* (Version 1)
* o <b>{@link SAMPLING_FREQUENCY_LOW}</b> -- Lower Sampling Frequency
* (Version 2 and 2.5)
*
* @see SAMPLING_FREQUENCY_LOW, SAMPLING_FREQUENCY_HIGH
* @return integer
*/
public function getFrequencyType() { return $this->_frequencyType; }
/**
* Returns the type of layer used.
*
* @see LAYER_ONE, LAYER_TWO, LAYER_THREE
* @return integer
*/
public function getLayer() { return $this->_layer; }
/**
* An alias to getRedundancy().
*
* @see getRedundancy
* @return boolean
*/
public function hasRedundancy() { return $this->getRedundancy(); }
/**
* Returns boolean corresponding to whether redundancy has been added in the
* audio bitstream to facilitate error detection and concealment. Equals
* <var>false</var> if no redundancy has been added, <var>true</var> if
* redundancy has been added.
*
* @return boolean
*/
public function getRedundancy() { return $this->_redundancy; }
/**
* Returns the bitrate in kbps. The returned value indicates the total bitrate
* irrespective of the mode (stereo, joint_stereo, dual_channel,
* single_channel).
*
* @return integer
*/
public function getBitrate() { return $this->_bitrate; }
/**
* Returns the sampling frequency in Hz.
*
* @return integer
*/
public function getSamplingFrequency() { return $this->_samplingFrequency; }
/**
* An alias to getPadding().
*
* @see getPadding
* @return boolean
*/
public function hasPadding() { return $this->getPadding(); }
/**
* Returns boolean corresponding the frame contains an additional slot to
* adjust the mean bitrate to the sampling frequency. Equals to
* <var>true</var> if padding has been added, <var>false</var> otherwise.
*
* Padding is only necessary with a sampling frequency of 44.1kHz.
*
* @return boolean
*/
public function getPadding() { return $this->_padding; }
/**
* Returns the mode. In Layer I and II the CHANNEL_JOINT_STEREO mode is
* intensity_stereo, in Layer III it is intensity_stereo and/or ms_stereo.
*
* @see CHANNEL_STEREO, CHANNEL_JOINT_STEREO, CHANNEL_DUAL_CHANNEL,
* CHANNEL_SINGLE_CHANNEL
* @return integer
*/
public function getMode() { return $this->_mode; }
/**
* Returns the mode extension used in CHANNEL_JOINT_STEREO mode.
*
* In Layer I and II the return type indicates which subbands are in
* intensity_stereo. All other subbands are coded in stereo.
*
* o <b>{@link MODE_SUBBAND_4_TO_31}</b> -- subbands 4-31 in
* intensity_stereo, bound==4
* o <b>{@link MODE_SUBBAND_8_TO_31}</b> -- subbands 8-31 in
* intensity_stereo, bound==8
* o <b>{@link MODE_SUBBAND_12_TO_31}</b> -- subbands 12-31 in
* intensity_stereo, bound==12
* o <b>{@link MODE_SUBBAND_16_TO_31}</b> -- subbands 16-31 in
* intensity_stereo, bound==16
*
* In Layer III they indicate which type of joint stereo coding method is
* applied. The frequency ranges over which the intensity_stereo and ms_stereo
* modes are applied are implicit in the algorithm. Please see
* {@link MODE_ISOFF_MSSOFF}, {@link MODE_ISON_MSSOFF},
* {@link MODE_ISOFF_MSSON}, and {@link MODE_ISON_MSSON}.
*
* @return integer
*/
public function getModeExtension() { return $this->_modeExtension; }
/**
* An alias to getCopyright().
*
* @see getCopyright
* @return boolean
*/
public function hasCopyright() { return $this->getCopyright(); }
/**
* Returns <var>true</var> if the coded bitstream is copyright protected,
* <var>false</var> otherwise.
*
* @return boolean
*/
public function getCopyright() { return $this->_copyright; }
/**
* An alias to getOriginal().
*
* @see getOriginal
* @return boolean
*/
public function isOriginal() { return $this->getOriginal(); }
/**
* Returns whether the bitstream is original or home made.
*
* @return boolean
*/
public function getOriginal() { return $this->_original; }
/**
* Returns the type of de-emphasis that shall be used. The value is one of the
* following.
*
* o <b>{@link EMPHASIS_NONE}</b> -- No emphasis
* o <b>{@link EMPHASIS_50_15}</b> -- 50/15 microsec. emphasis
* o <b>{@link EMPHASIS_CCIT_J17}</b> -- CCITT J.17
*
* @see EMPHASIS_NONE, EMPHASIS_50_15, EMPHASIS_CCIT_J17
* @return integer
*/
public function getEmphasis() { return $this->_emphasis; }
/**
* Returns the length of the frame based on the current layer, bit rate,
* sampling frequency and padding, in bytes.
*
* @return integer
*/
public function getLength() { return $this->_length; }
/**
* Returns the number of samples contained in the frame.
*
* @return integer
*/
public function getSamples() { return $this->_samples; }
/**
* Returns the 16-bit CRC of the frame or <var>false</var> if not present.
*
* @return integer
*/
public function getCrc()
{
if ($this->getOption("readmode", "lazy") == "lazy" &&
$this->hasRedundancy() && $this->_crc === false) {
$this->_readCrc();
}
return $this->_crc;
}
/**
* Reads the CRC data.
*/
private function _readCrc()
{
if ($this->hasRedundancy()) {
$offset = $this->_reader->getOffset();
$this->_reader->setOffset($this->_offset + 4);
$this->_crc = $reader->readUInt16BE();
$this->_reader->setOffset($offset);
}
}
/**
* Returns the audio data.
*
* @return string
*/
public function getData()
{
if ($this->getOption("readmode", "lazy") == "lazy" &&
$this->_data === false) {
$this->_readData();
}
return $this->_data;
}
/**
* Reads the frame data.
*/
private function _readData()
{
$offset = $this->_reader->getOffset();
$this->_reader->setOffset
($this->_offset + 4 + ($this->hasRedundancy() ? 2 : 0));
$this->_data = $this->_reader->read
($this->getLength() - 4 - ($this->hasRedundancy() ? 2 : 0));
$this->_reader->setOffset($offset);
}
}

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<?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 MPEG
* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
* @license http://code.google.com/p/php-reader/wiki/License New BSD License
* @version $Id$
*/
/**#@+ @ignore */
require_once("Reader.php");
require_once("Twiddling.php");
require_once("MPEG/Object.php");
/**#@-*/
/**
* This class represents a LAME extension to the Xing VBR header. The purpose of
* this header is to provide extra information about the MP3 bistream, encoder
* and parameters used. This header should, as much as possible, be meaningfull
* for as many encoders as possible, even if it is unlikely that other encoders
* than LAME will implement it.
*
* This header should be backward compatible with the Xing VBR tag, providing
* basic support for a lot of already written software. As much as possible the
* current revision (revision 1) should provide information similar to the one
* already provided by revision 0.
*
* @package php-reader
* @subpackage MPEG
* @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: 1 $
*/
class MPEG_Audio_LAMEHeader extends MPEG_Object
{
/** @var integer */
const VBR_METHOD_CONSTANT = 1;
/** @var integer */
const VBR_METHOD_ABR = 2;
/** @var integer */
const VBR_METHOD_RH = 3;
/** @var integer */
const VBR_METHOD_MTRH = 4;
/** @var integer */
const VBR_METHOD_MT = 5;
/** @var integer */
const ENCODING_FLAG_NSPSYTUNE = 1;
/** @var integer */
const ENCODING_FLAG_NSSAFEJOINT = 2;
/** @var integer */
const ENCODING_FLAG_NOGAP_CONTINUED = 4;
/** @var integer */
const ENCODING_FLAG_NOGAP_CONTINUATION = 8;
/** @var integer */
const MODE_MONO = 0;
/** @var integer */
const MODE_STEREO = 1;
/** @var integer */
const MODE_DUAL = 2;
/** @var integer */
const MODE_JOINT = 3;
/** @var integer */
const MODE_FORCE = 4;
/** @var integer */
const MODE_AUTO = 5;
/** @var integer */
const MODE_INTENSITY = 6;
/** @var integer */
const MODE_UNDEFINED = 7;
/** @var integer */
const SOURCE_FREQUENCY_32000_OR_LOWER = 0;
/** @var integer */
const SOURCE_FREQUENCY_44100 = 1;
/** @var integer */
const SOURCE_FREQUENCY_48000 = 2;
/** @var integer */
const SOURCE_FREQUENCY_HIGHER = 3;
/** @var integer */
const SURROUND_NONE = 0;
/** @var integer */
const SURROUND_DPL = 1;
/** @var integer */
const SURROUND_DPL2 = 2;
/** @var integer */
const SURROUND_AMBISONIC = 3;
/** @var string */
private $_version;
/** @var integer */
private $_revision;
/** @var integer */
private $_vbrMethod;
/** @var integer */
private $_lowpass;
/** @var integer */
private $_peakSignalAmplitude;
/** @var integer */
private $_radioReplayGain;
/** @var integer */
private $_audiophileReplayGain;
/** @var integer */
private $_encodingFlags;
/** @var integer */
private $_athType;
/** @var integer */
private $_bitrate;
/** @var integer */
private $_encoderDelaySamples;
/** @var integer */
private $_paddedSamples;
/** @var integer */
private $_sourceSampleFrequency;
/** @var boolean */
private $_unwiseSettingsUsed;
/** @var integer */
private $_mode;
/** @var integer */
private $_noiseShaping;
/** @var integer */
private $_mp3Gain;
/** @var integer */
private $_surroundInfo;
/** @var integer */
private $_presetUsed;
/** @var integer */
private $_musicLength;
/** @var integer */
private $_musicCrc;
/** @var integer */
private $_crc;
/**
* Constructs the class with given parameters and reads object related data
* from the bitstream.
*
* @param Reader $reader The reader object.
* @param Array $options Array of options.
*/
public function __construct($reader, &$options = array())
{
parent::__construct($reader, $options);
$this->_version = $this->_reader->readString8(5);
$tmp = $this->_reader->readUInt8();
$this->_revision = Twiddling::getValue($tmp, 4, 8);
$this->_vbrMethod = Twiddling::getValue($tmp, 0, 3);
$this->_lowpass = $this->_reader->readUInt8() * 100;
$this->_peakSignalAmplitude = $this->_reader->readUInt32BE();
$tmp = $this->_reader->readUInt16BE();
$this->_radioReplayGain = array(
"name" => Twiddling::getValue($tmp, 0, 2),
"originator" => Twiddling::getValue($tmp, 3, 5),
"absoluteGainAdjustment" => Twiddling::getValue($tmp, 7, 15) / 10
);
$tmp = $this->_reader->readUInt16BE();
$this->_audiophileReplayGain = array(
"name" => Twiddling::getValue($tmp, 0, 2),
"originator" => Twiddling::getValue($tmp, 3, 5),
"absoluteGainAdjustment" => Twiddling::getValue($tmp, 7, 15) / 10
);
$tmp = $this->_reader->readUInt8();
$this->_encodingFlags = Twiddling::getValue($tmp, 4, 8);
$this->_athType = Twiddling::getValue($tmp, 0, 3);
$this->_bitrate = $this->_reader->readUInt8();
$tmp = $this->_reader->readUInt32BE();
// Encoder delay fields
$this->_encoderDelaySamples = Twiddling::getValue($tmp, 20, 31);
$this->_paddedSamples = Twiddling::getValue($tmp, 8, 19);
// Misc field
$this->_sourceSampleFrequency = Twiddling::getValue($tmp, 6, 7);
$this->_unwiseSettingsUsed = Twiddling::testBit($tmp, 5);
$this->_mode = Twiddling::getValue($tmp, 2, 4);
$this->_noiseShaping = Twiddling::getValue($tmp, 0, 1);
$this->_mp3Gain = pow(2, $this->_reader->readInt8() / 4);
$tmp = $this->_reader->readUInt16BE();
$this->_surroundInfo = Twiddling::getValue($tmp, 11, 14);
$this->_presetUsed = Twiddling::getValue($tmp, 0, 10);
$this->_musicLength = $this->_reader->readUInt32BE();
$this->_musicCrc = $this->_reader->readUInt16BE();
$this->_crc = $this->_reader->readUInt16BE();
}
/**
* Returns the version string of the header.
*
* @return string
*/
public function getVersion() { return $this->_version; }
/**
* Returns the info tag revision.
*
* @return integer
*/
public function getRevision() { return $this->_revision; }
/**
* Returns the VBR method used for encoding. See the corresponding constants
* for possible return values.
*
* @return integer
*/
public function getVbrMethod() { return $this->_vbrMethod; }
/**
* Returns the lowpass filter value.
*
* @return integer
*/
public function getLowpass() { return $this->_lowpass; }
/**
* Returns the peak signal amplitude field of replay gain. The value of 1.0
* (ie 100%) represents maximal signal amplitude storeable in decoding format.
*
* @return integer
*/
public function getPeakSignalAmplitude()
{
return $this->_peakSignalAmplitude;
}
/**
* Returns the radio replay gain field of replay gain, required to make all
* tracks equal loudness, as an array that consists of the following keys.
*
* o name -- Specifies the name of the gain adjustment. Can be one of the
* following values: 0 = not set, 1 = radio, or 2 = audiophile.
*
* o originator -- Specifies the originator of the gain adjustment. Can be
* one of the following values: 0 = not set, 1 = set by artist, 2 = set
* by user, 3 = set by my model, 4 = set by simple RMS average.
*
* o absoluteGainAdjustment -- Speficies the absolute gain adjustment.
*
* @return Array
*/
public function getRadioReplayGain() { return $this->_radioReplayGain; }
/**
* Returns the audiophile replay gain field of replay gain, required to give
* ideal listening loudness, as an array that consists of the following keys.
*
* o name -- Specifies the name of the gain adjustment. Can be one of the
* following values: 0 = not set, 1 = radio, or 2 = audiophile.
*
* o originator -- Specifies the originator of the gain adjustment. Can be
* one of the following values: 0 = not set, 1 = set by artist, 2 = set
* by user, 3 = set by my model, 4 = set by simple RMS average.
*
* o absoluteGainAdjustment -- Speficies the absolute gain adjustment.
*
* @return Array
*/
public function getAudiophileReplayGain()
{
return $this->_audiophileReplayGain;
}
/**
* Returns the encoding flags. See the corresponding flag constants for
* possible values.
*
* @return integer
*/
public function getEncodingFlags() { return $this->_encodingFlags; }
/**
* Returns the ATH type.
*
* @return integer
*/
public function getAthType() { return $this->_athType; }
/**
* Returns the bitrate for CBR encoded files and the minimal birate for
* VBR encoded file. The maximum value of this field is 255 even with higher
* actual bitrates.
*
* @return integer
*/
public function getBitrate() { return $this->_bitrate; }
/**
* Returns the encoder delay or number of samples added at start.
*
* @return integer
*/
public function getEncoderDelaySamples()
{
return $this->_encoderDelaySamples;
}
/**
* Returns the number of padded samples to complete the last frame.
*
* @return integer
*/
public function getPaddedSamples() { return $this->_paddedSamples; }
/**
* Returns the source sample frequency. See corresponding constants for
* possible values.
*
* @return integer
*/
public function getSourceSampleFrequency()
{
return $this->_sourceSampleFrequency;
}
/**
* An alias to getUnwiseSettingsUsed().
*
* @see getUnwiseSettingsUsed
* @return boolean
*/
public function areUnwiseSettingsUsed()
{
return $this->getUnwiseSettingsUsed();
}
/**
* Returns whether unwise settings were used to encode the file.
*
* @return boolean
*/
public function getUnwiseSettingsUsed() { return $this->_unwiseSettingsUsed; }
/**
* Returns the stereo mode. See corresponding constants for possible values.
*
* @return integer
*/
public function getMode() { return $this->_mode; }
/**
* Returns the noise shaping.
*
* @return integer
*/
public function getNoiseShaping() { return $this->_noiseShaping; }
/**
* Returns the MP3 gain change. Any MP3 can be amplified in a lossless manner.
* If done so, this field can be used to log such transformation happened so
* that any given time it can be undone.
*
* @return integer
*/
public function getMp3Gain() { return $this->_mp3Gain; }
/**
* Returns the surround info. See corresponding contants for possible values.
*
* @return integer
*/
public function getSurroundInfo() { return $this->_surroundInfo; }
/**
* Returns the preset used in encoding.
*
* @return integer
*/
public function getPresetUsed() { return $this->_presetUsed; }
/**
* Returns the exact length in bytes of the MP3 file originally made by LAME
* excluded ID3 tag info at the end.
*
* The first byte it counts is the first byte of this LAME header and the last
* byte it counts is the last byte of the last MP3 frame containing music.
* The value should be equal to file length at the time of LAME encoding,
* except when using ID3 tags.
*
* @return integer
*/
public function getMusicLength() { return $this->_musicLength; }
/**
* Returns the CRC-16 of the complete MP3 music data as made originally by
* LAME.
*
* @return integer
*/
public function getMusicCrc() { return $this->_musicCrc; }
/**
* Returns the CRC-16 of the first 190 bytes of the header frame.
*
* @return integer
*/
public function getCrc() { return $this->_crc; }
}

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<?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 MPEG
* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
* @license http://code.google.com/p/php-reader/wiki/License New BSD License
* @version $Id: Object.php 107 2008-08-03 19:09:16Z svollbehr $
*/
/**#@+ @ignore */
require_once("MPEG/Object.php");
/**#@-*/
/**
* The base class for all MPEG Audio objects.
*
* @package php-reader
* @subpackage MPEG
* @author Ryan Butterfield <buttza@gmail.com>
* @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: 107 $
*/
abstract class MPEG_Audio_Object extends MPEG_Object
{
/** @var integer */
const VERSION_ONE = 3;
/** @var integer */
const VERSION_TWO = 2;
/** @var integer */
const VERSION_TWO_FIVE = 0;
/** @var integer */
const SAMPLING_FREQUENCY_LOW = 0;
/** @var integer */
const SAMPLING_FREQUENCY_HIGH = 1;
/** @var integer */
const LAYER_ONE = 3;
/** @var integer */
const LAYER_TWO = 2;
/** @var integer */
const LAYER_THREE = 1;
/** @var integer */
const CHANNEL_STEREO = 0;
/** @var integer */
const CHANNEL_JOINT_STEREO = 1;
/** @var integer */
const CHANNEL_DUAL_CHANNEL = 2;
/** @var integer */
const CHANNEL_SINGLE_CHANNEL = 3;
/** @var integer */
const MODE_SUBBAND_4_TO_31 = 0;
/** @var integer */
const MODE_SUBBAND_8_TO_31 = 1;
/** @var integer */
const MODE_SUBBAND_12_TO_31 = 2;
/** @var integer */
const MODE_SUBBAND_16_TO_31 = 3;
/** @var integer */
const MODE_ISOFF_MSSOFF = 0;
/** @var integer */
const MODE_ISON_MSSOFF = 1;
/** @var integer */
const MODE_ISOFF_MSSON = 2;
/** @var integer */
const MODE_ISON_MSSON = 3;
/** @var integer */
const EMPHASIS_NONE = 0;
/** @var integer */
const EMPHASIS_50_15 = 1;
/** @var integer */
const EMPHASIS_CCIT_J17 = 3;
/**
* Layer III side information size lookup table. The table has the following
* format.
*
* <code>
* array (
* SAMPLING_FREQUENCY_HIGH | SAMPLING_FREQUENCY_LOW => array (
* CHANNEL_STEREO | CHANNEL_JOINT_STEREO | CHANNEL_DUAL_CHANNEL |
* CHANNEL_SINGLE_CHANNEL => <size>
* )
* )
* </code>
*
*
* @var Array
*/
protected static $sidesizes = array(
self::SAMPLING_FREQUENCY_HIGH => array(
self::CHANNEL_STEREO => 32,
self::CHANNEL_JOINT_STEREO => 32,
self::CHANNEL_DUAL_CHANNEL => 32,
self::CHANNEL_SINGLE_CHANNEL => 17
),
self::SAMPLING_FREQUENCY_LOW => array(
self::CHANNEL_STEREO => 17,
self::CHANNEL_JOINT_STEREO => 17,
self::CHANNEL_DUAL_CHANNEL => 17,
self::CHANNEL_SINGLE_CHANNEL => 9
)
);
/**
* Constructs the class with given parameters.
*
* @param Reader $reader The reader object.
* @param Array $options The options array.
*/
public function __construct($reader, &$options = array())
{
parent::__construct($reader, $options);
}
}

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<?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 MPEG
* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
* @license http://code.google.com/p/php-reader/wiki/License New BSD License
* @version $Id: VBRIHeader.php 1 2008-07-19 10:43:41Z rbutterfield $
*/
/**#@+ @ignore */
require_once("Reader.php");
require_once("Twiddling.php");
require_once("MPEG/Object.php");
/**#@-*/
/**
* This class represents the Fraunhofer IIS VBR header which is often found in
* the first frame of an MPEG stream.
*
* @package php-reader
* @subpackage MPEG
* @author Ryan Butterfield <buttza@gmail.com>
* @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: 1 $
*/
class MPEG_Audio_VBRIHeader extends MPEG_Object
{
/** @var integer */
private $_version;
/** @var integer */
private $_delay;
/** @var integer */
private $_qualityIndicator;
/** @var integer */
private $_bytes;
/** @var integer */
private $_frames;
/** @var Array */
private $_toc = array();
/** @var integer */
private $_tocFramesPerEntry;
/** @var integer */
private $_length;
/**
* Constructs the class with given parameters and reads object related data
* from the bitstream.
*
* @param Reader $reader The reader object.
* @param Array $options Array of options.
*/
public function __construct($reader, &$options = array())
{
$offset = $this->_reader->getOffset();
$this->_version = $this->_reader->readUInt16BE();
$this->_delay = $this->_reader->readUInt16BE();
$this->_qualityIndicator = $this->_reader->readUInt16BE();
$this->_bytes = $this->_reader->readUInt32BE();
$this->_frames = $this->_reader->readUInt32BE();
$tocEntries = $this->_reader->readUInt16BE();
$tocEntryScale = $this->_reader->readUInt16BE();
$tocEntrySize = $this->_reader->readUInt16BE();
$this->_tocFramesPerEntry = $this->_reader->readUInt16BE();
$this->_toc = array_merge(unpack(($tocEntrySize == 1) ? "C*" :
($tocEntrySize == 2) ? "n*" : "N*",
$this->_reader->read($tocCount * $tocEntrySize)));
foreach ($this->_toc as $key => $value)
$this->_toc[$key] = $tocEntryScale * $value;
$this->_length = $this->_reader->getOffset() - $offset;
}
/**
* Returns the header version.
*
* @return integer
*/
public function getVersion() { return $this->_version; }
/**
* Returns the delay.
*
* @return integer
*/
public function getDelay() { return $this->_delay; }
/**
* Returns the quality indicator. Return value varies from 0 (best quality) to
* 100 (worst quality).
*
* @return integer
*/
public function getQualityIndicator() { return $this->_qualityIndicator; }
/**
* Returns the number of bytes in the file.
*
* @return integer
*/
public function getBytes() { return $this->_bytes; }
/**
* Returns the number of frames in the file.
*
* @return integer
*/
public function getFrames() { return $this->_frames; }
/**
* Returns the table of contents array.
*
* @return Array
*/
public function getToc() { return $this->_toc; }
/**
* Returns the number of frames per TOC entry.
*
* @return integer
*/
public function getTocFramesPerEntry() { return $this->_tocFramesPerEntry; }
/**
* Returns the length of the header in bytes.
*
* @return integer
*/
public function getLength() { return $this->_length; }
}

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<?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 MPEG
* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
* @license http://code.google.com/p/php-reader/wiki/License New BSD License
* @version $Id: XINGHeader.php 1 2008-07-06 10:43:41Z rbutterfield $
*/
/**#@+ @ignore */
require_once("Reader.php");
require_once("Twiddling.php");
require_once("MPEG/Object.php");
/**#@-*/
/**
* This class represents the Xing VBR header which is often found in the first
* frame of an MPEG stream.
*
* @package php-reader
* @subpackage MPEG
* @author Ryan Butterfield <buttza@gmail.com>
* @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: 1 $
*/
class MPEG_Audio_XINGHeader extends MPEG_Object
{
/** @var integer */
private $_frames = false;
/** @var integer */
private $_bytes = false;
/** @var Array */
private $_toc = array();
/** @var integer */
private $_qualityIndicator = false;
/**
* Constructs the class with given parameters and reads object related data
* from the bitstream.
*
* @param Reader $reader The reader object.
* @param Array $options Array of options.
*/
public function __construct($reader, &$options = array())
{
parent::__construct($reader, $options);
$flags = $reader->readUInt32BE();
if (Twiddling::testAnyBits($flags, 0x1))
$this->_frames = $this->_reader->readUInt32BE();
if (Twiddling::testAnyBits($flags, 0x2))
$this->_bytes = $this->_reader->readUInt32BE();
if (Twiddling::testAnyBits($flags, 0x4))
$this->_toc = array_merge(unpack("C*", $this->_reader->read(100)));
if (Twiddling::testAnyBits($flags, 0x8))
$this->_qualityIndicator = $this->_reader->readUInt32BE();
}
/**
* Returns the number of frames in the file.
*
* @return integer
*/
public function getFrames() { return $this->_frames; }
/**
* Returns the number of bytes in the file.
*
* @return integer
*/
public function getBytes() { return $this->_bytes; }
/**
* Returns the table of contents array. The returned array has a fixed amount
* of 100 seek points to the file.
*
* @return Array
*/
public function getToc() { return $this->_toc; }
/**
* Returns the quality indicator. The indicator is from 0 (best quality) to
* 100 (worst quality).
*
* @return integer
*/
public function getQualityIndicator() { return $this->_qualityIndicator; }
/**
* Returns the length of the header in bytes.
*
* @return integer
*/
public function getLength()
{
return 4 +
($this->_frames !== false ? 4 : 0) +
($this->_bytes !== false ? 4 : 0) +
(empty($this->_toc) ? 0 : 100) +
($this->_qualityIndicator !== false ? 4 : 0);
}
}

51
src/MPEG/Exception.php Normal file
View File

@@ -0,0 +1,51 @@
<?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 MPEG
* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
* @license http://code.google.com/p/php-reader/wiki/License New BSD License
* @version $Id: Exception.php 85 2008-04-23 20:21:36Z svollbehr $
*/
/**
* The MPEG_Exception is thrown whenever an error occurs within the family of
* {@link MPEG} classes.
*
* @package php-reader
* @subpackage MPEG
* @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: 85 $
*/
class MPEG_Exception extends Exception
{
}

225
src/MPEG/Object.php Normal file
View File

@@ -0,0 +1,225 @@
<?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 MPEG
* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
* @license http://code.google.com/p/php-reader/wiki/License New BSD License
* @version $Id: Object.php 107 2008-08-03 19:09:16Z svollbehr $
*/
/**#@+ @ignore */
require_once("Reader.php");
require_once("MPEG/Exception.php");
/**#@-*/
/**
* The base class for all MPEG objects.
*
* @package php-reader
* @subpackage MPEG
* @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: 107 $
*/
abstract class MPEG_Object
{
/**
* The reader object.
*
* @var Reader
*/
protected $_reader;
/**
* The options array.
*
* @var Array
*/
private $_options;
/**
* Constructs the class with given parameters.
*
* @param Reader $reader The reader object.
* @param Array $options The options array.
*/
public function __construct($reader, &$options = array())
{
$this->_reader = $reader;
$this->_options = &$options;
}
/**
* Returns the options array.
*
* @return Array
*/
public function getOptions() { return $this->_options; }
/**
* Returns the given option value, or the default value if the option is not
* defined.
*
* @param string $option The name of the option.
* @param mixed $defaultValue The default value to be returned.
*/
public function getOption($option, $defaultValue = false)
{
if (isset($this->_options[$option]))
return $this->_options[$option];
return $defaultValue;
}
/**
* Sets the options array. See {@link MPEG} class for available options.
*
* @param Array $options The options array.
*/
public function setOptions(&$options) { $this->_options = &$options; }
/**
* Sets the given option the given value.
*
* @param string $option The name of the option.
* @param mixed $value The value to set for the option.
*/
public function setOption($option, $value)
{
$this->_options[$option] = $value;
}
/**
* Finds and returns the next start code. Start codes are reserved bit
* patterns in the video file that do not otherwise occur in the video stream.
*
* All start codes are byte aligned and start with the following byte
* sequence: 0x00 0x00 0x01.
*
* @return integer
*/
protected function nextStartCode()
{
$buffer = " ";
for ($i = 0; $i < 4; $i++) {
$start = $this->_reader->getOffset();
if (($buffer = substr($buffer, -4) . $this->_reader->read(512)) === false)
throw new MPEG_Exception("Invalid data");
$limit = strlen($buffer);
$pos = 0;
while ($pos < $limit - 3) {
if (Transform::fromUInt8($buffer{$pos++}) == 0 &&
Transform::fromUInt16BE(substr($buffer, $pos, 2)) == 1) {
if (($pos += 2) < $limit - 2)
if (Transform::fromUInt16BE(substr($buffer, $pos, 2)) == 0 &&
Transform::fromUInt8($buffer{$pos + 2}) == 1)
continue;
$this->_reader->setOffset($start + $pos - 3);
return Transform::fromUInt8($buffer{$pos++}) & 0xff | 0x100;
}
}
$this->_reader->setOffset($start + $limit);
}
/* No start code found within 2048 bytes, the maximum size of a pack */
throw new MPEG_Exception("Invalid data");
}
/**
* Finds and returns the previous start code. Start codes are reserved bit
* patterns in the video file that do not otherwise occur in the video stream.
*
* All start codes are byte aligned and start with the following byte
* sequence: 0x00 0x00 0x01.
*
* @return integer
*/
protected function prevStartCode()
{
$buffer = " ";
$start;
$position = $this->_reader->getOffset();
while ($position > 0) {
$start = 0;
$position = $position - 512;
if ($position < 0)
throw new MPEG_Exception("Invalid data");
$this->_reader->setOffset($position);
$buffer = $this->_reader->read(512) . substr($buffer, 0, 4);
$pos = 512 - 8;
while ($pos > 3) {
if (Transform::fromUInt8($buffer{$pos}) == 0 &&
Transform::fromUInt16BE(substr($buffer, $pos + 1, 2)) == 1) {
if ($pos + 2 < 512 &&
Transform::fromUInt16BE(substr($buffer, $pos + 3, 2)) == 0 &&
Transform::fromUInt8($buffer{$pos + 5}) == 1) {
$pos --;
continue;
}
$this->_reader->setOffset($position + $pos);
return Transform::fromUInt8($buffer{$pos + 3}) & 0xff | 0x100;
}
$pos--;
}
$this->_reader->setOffset($position = $position + 3);
}
return 0;
}
/**
* Magic function so that $obj->value will work.
*
* @param string $name The field name.
* @return mixed
*/
public function __get($name)
{
if (method_exists($this, "get" . ucfirst($name)))
return call_user_func(array($this, "get" . ucfirst($name)));
else throw new MPEG_Exception("Unknown field: " . $name);
}
/**
* Magic function so that assignments with $obj->value will work.
*
* @param string $name The field name.
* @param string $value The field value.
* @return mixed
*/
public function __set($name, $value)
{
if (method_exists($this, "set" . ucfirst($name)))
call_user_func
(array($this, "set" . ucfirst($name)), $value);
else throw new MPEG_Exception("Unknown field: " . $name);
}
}

10
src/Twiddling.php
View File

@@ -39,6 +39,7 @@
* *
* @package php-reader * @package php-reader
* @author Ryan Butterfield <buttza@gmail.com> * @author Ryan Butterfield <buttza@gmail.com>
* @author Sven Vollbehr <svollbehr@gmail.com>
* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup * @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
* @license http://code.google.com/p/php-reader/wiki/License New BSD License * @license http://code.google.com/p/php-reader/wiki/License New BSD License
* @version $Rev$ * @version $Rev$
@@ -200,8 +201,8 @@ final class Twiddling
*/ */
public static function setValue($integer, $start, $end, $value) public static function setValue($integer, $start, $end, $value)
{ {
return self::clearBits($integer, self::getMask($start, $end) << $start) | return self::clearBits
($value << $start); ($integer, self::getMask($start, $end) << $start) | ($value << $start);
} }
/** /**
@@ -227,9 +228,6 @@ final class Twiddling
*/ */
public static function getMask($start, $end) public static function getMask($start, $end)
{ {
$mask = 0; return ($tmp = (1 << $end)) + $tmp - (1 << $start);
for (; $start <= $end; $start++)
$mask |= 1 << $start;
return $mask;
} }
} }