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+<?php
+
+// error_reporting(E_ALL); ini_set('display_errors', 1); // uncomment this line for debugging
+
+/**
+* Project: PHPWavUtils: Classes for creating, reading, and manipulating WAV files in PHP<br />
+* File: WavFile.php<br />
+*
+* Copyright (c) 2014, Drew Phillips
+* 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.
+*
+* 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 HOLDER 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.
+*
+* Any modifications to the library should be indicated clearly in the source code
+* to inform users that the changes are not a part of the original software.<br /><br />
+*
+* @copyright 2014 Drew Phillips
+* @author Drew Phillips <drew@drew-phillips.com>
+* @author Paul Voegler <http://www.voegler.eu/>
+* @version 1.1.1 (Sep 2015)
+* @package PHPWavUtils
+* @license BSD License
+*
+* Changelog:
+* 1.1.1 (09/08/2015)
+* - Fix degrade() method to call filter correctly (Rasmus Lerdorf)
+*
+* 1.1 (02/8/2014)
+* - Add method setIgnoreChunkSizes() to allow reading of wav data with bogus chunk sizes set.
+* This allows streamed wav data to be processed where the chunk sizes were not known when
+* writing the header. Instead calculates the chunk sizes automatically.
+* - Add simple volume filter to attenuate or amplify the audio signal.
+*
+* 1.0 (10/2/2012)
+* - Fix insertSilence() creating invalid block size
+*
+* 1.0 RC1 (4/20/2012)
+* - Initial release candidate
+* - Supports 8, 16, 24, 32 bit PCM, 32-bit IEEE FLOAT, Extensible Format
+* - Support for 18 channels of audio
+* - Ability to read an offset from a file to reduce memory footprint with large files
+* - Single-pass audio filter processing
+* - Highly accurate and efficient mix and normalization filters (http://www.voegler.eu/pub/audio/)
+* - Utility filters for degrading audio, and inserting silence
+*
+* 0.6 (4/12/2012)
+* - Support 8, 16, 24, 32 bit and PCM float (Paul Voegler)
+* - Add normalize filter, misc improvements and fixes (Paul Voegler)
+* - Normalize parameters to filter() to use filter constants as array indices
+* - Add option to mix filter to loop the target file if the source is longer
+*
+* 0.5 (4/3/2012)
+* - Fix binary pack routine (Paul Voegler)
+* - Add improved mixing function (Paul Voegler)
+*
+*/
+
+class WavFile
+{
+ /*%******************************************************************************************%*/
+ // Class constants
+
+ /** @var int Filter flag for mixing two files */
+ const FILTER_MIX = 0x01;
+
+ /** @var int Filter flag for normalizing audio data */
+ const FILTER_NORMALIZE = 0x02;
+
+ /** @var int Filter flag for degrading audio data */
+ const FILTER_DEGRADE = 0x04;
+
+ /** @var int Filter flag for amplifying or attenuating audio data. */
+ const FILTER_VOLUME = 0x08;
+
+ /** @var int Maximum number of channels */
+ const MAX_CHANNEL = 18;
+
+ /** @var int Maximum sample rate */
+ const MAX_SAMPLERATE = 192000;
+
+ /** Channel Locations for ChannelMask */
+ const SPEAKER_DEFAULT = 0x000000;
+ const SPEAKER_FRONT_LEFT = 0x000001;
+ const SPEAKER_FRONT_RIGHT = 0x000002;
+ const SPEAKER_FRONT_CENTER = 0x000004;
+ const SPEAKER_LOW_FREQUENCY = 0x000008;
+ const SPEAKER_BACK_LEFT = 0x000010;
+ const SPEAKER_BACK_RIGHT = 0x000020;
+ const SPEAKER_FRONT_LEFT_OF_CENTER = 0x000040;
+ const SPEAKER_FRONT_RIGHT_OF_CENTER = 0x000080;
+ const SPEAKER_BACK_CENTER = 0x000100;
+ const SPEAKER_SIDE_LEFT = 0x000200;
+ const SPEAKER_SIDE_RIGHT = 0x000400;
+ const SPEAKER_TOP_CENTER = 0x000800;
+ const SPEAKER_TOP_FRONT_LEFT = 0x001000;
+ const SPEAKER_TOP_FRONT_CENTER = 0x002000;
+ const SPEAKER_TOP_FRONT_RIGHT = 0x004000;
+ const SPEAKER_TOP_BACK_LEFT = 0x008000;
+ const SPEAKER_TOP_BACK_CENTER = 0x010000;
+ const SPEAKER_TOP_BACK_RIGHT = 0x020000;
+ const SPEAKER_ALL = 0x03FFFF;
+
+ /** @var int PCM Audio Format */
+ const WAVE_FORMAT_PCM = 0x0001;
+
+ /** @var int IEEE FLOAT Audio Format */
+ const WAVE_FORMAT_IEEE_FLOAT = 0x0003;
+
+ /** @var int EXTENSIBLE Audio Format - actual audio format defined by SubFormat */
+ const WAVE_FORMAT_EXTENSIBLE = 0xFFFE;
+
+ /** @var string PCM Audio Format SubType - LE hex representation of GUID {00000001-0000-0010-8000-00AA00389B71} */
+ const WAVE_SUBFORMAT_PCM = "0100000000001000800000aa00389b71";
+
+ /** @var string IEEE FLOAT Audio Format SubType - LE hex representation of GUID {00000003-0000-0010-8000-00AA00389B71} */
+ const WAVE_SUBFORMAT_IEEE_FLOAT = "0300000000001000800000aa00389b71";
+
+
+ /*%******************************************************************************************%*/
+ // Properties
+
+ /** @var array Log base modifier lookup table for a given threshold (in 0.05 steps) used by normalizeSample.
+ * Adjusts the slope (1st derivative) of the log function at the threshold to 1 for a smooth transition
+ * from linear to logarithmic amplitude output. */
+ protected static $LOOKUP_LOGBASE = array(
+ 2.513, 2.667, 2.841, 3.038, 3.262,
+ 3.520, 3.819, 4.171, 4.589, 5.093,
+ 5.711, 6.487, 7.483, 8.806, 10.634,
+ 13.302, 17.510, 24.970, 41.155, 96.088
+ );
+
+ /** @var int The actual physical file size */
+ protected $_actualSize;
+
+ /** @var int The size of the file in RIFF header */
+ protected $_chunkSize;
+
+ /** @var int The size of the "fmt " chunk */
+ protected $_fmtChunkSize;
+
+ /** @var int The size of the extended "fmt " data */
+ protected $_fmtExtendedSize;
+
+ /** @var int The size of the "fact" chunk */
+ protected $_factChunkSize;
+
+ /** @var int Size of the data chunk */
+ protected $_dataSize;
+
+ /** @var int Size of the data chunk in the opened wav file */
+ protected $_dataSize_fp;
+
+ /** @var bool Does _dataSize really reflect strlen($_samples)? Case when a wav file is read with readData = false */
+ protected $_dataSize_valid;
+
+ /** @var int Starting offset of data chunk */
+ protected $_dataOffset;
+
+ /** @var int The audio format - WavFile::WAVE_FORMAT_* */
+ protected $_audioFormat;
+
+ /** @var int|string|null The audio subformat - WavFile::WAVE_SUBFORMAT_* */
+ protected $_audioSubFormat;
+
+ /** @var int Number of channels in the audio file */
+ protected $_numChannels;
+
+ /** @var int The channel mask */
+ protected $_channelMask;
+
+ /** @var int Samples per second */
+ protected $_sampleRate;
+
+ /** @var int Number of bits per sample */
+ protected $_bitsPerSample;
+
+ /** @var int Number of valid bits per sample */
+ protected $_validBitsPerSample;
+
+ /** @var int NumChannels * BitsPerSample/8 */
+ protected $_blockAlign;
+
+ /** @var int Number of sample blocks */
+ protected $_numBlocks;
+
+ /** @var int Bytes per second */
+ protected $_byteRate;
+
+ /** @var bool Ignore chunk sizes when reading wav data (useful when reading data from a stream where chunk sizes contain dummy values) */
+ protected $_ignoreChunkSizes;
+
+ /** @var string Binary string of samples */
+ protected $_samples;
+
+ /** @var resource|null The file pointer used for reading wavs from file or memory */
+ protected $_fp;
+
+
+ /*%******************************************************************************************%*/
+ // Special methods
+
+ /**
+ * WavFile Constructor.
+ *
+ * <code>
+ * $wav1 = new WavFile(2, 44100, 16); // new wav with 2 channels, at 44100 samples/sec and 16 bits per sample
+ * $wav2 = new WavFile('./audio/sound.wav'); // open and read wav file
+ * </code>
+ *
+ * @param string|int $numChannelsOrFileName (Optional) If string, the filename of the wav file to open. The number of channels otherwise. Defaults to 1.
+ * @param int|bool $sampleRateOrReadData (Optional) If opening a file and boolean, decides whether to read the data chunk or not. Defaults to true. The sample rate in samples per second otherwise. 8000 = standard telephone, 16000 = wideband telephone, 32000 = FM radio and 44100 = CD quality. Defaults to 8000.
+ * @param int $bitsPerSample (Optional) The number of bits per sample. Has to be 8, 16 or 24 for PCM audio or 32 for IEEE FLOAT audio. 8 = telephone, 16 = CD and 24 or 32 = studio quality. Defaults to 8.
+ * @throws WavFormatException
+ * @throws WavFileException
+ */
+ public function __construct($numChannelsOrFileName = null, $sampleRateOrReadData = null, $bitsPerSample = null)
+ {
+ $this->_actualSize = 44;
+ $this->_chunkSize = 36;
+ $this->_fmtChunkSize = 16;
+ $this->_fmtExtendedSize = 0;
+ $this->_factChunkSize = 0;
+ $this->_dataSize = 0;
+ $this->_dataSize_fp = 0;
+ $this->_dataSize_valid = true;
+ $this->_dataOffset = 44;
+ $this->_audioFormat = self::WAVE_FORMAT_PCM;
+ $this->_audioSubFormat = null;
+ $this->_numChannels = 1;
+ $this->_channelMask = self::SPEAKER_DEFAULT;
+ $this->_sampleRate = 8000;
+ $this->_bitsPerSample = 8;
+ $this->_validBitsPerSample = 8;
+ $this->_blockAlign = 1;
+ $this->_numBlocks = 0;
+ $this->_byteRate = 8000;
+ $this->_ignoreChunkSizes = false;
+ $this->_samples = '';
+ $this->_fp = null;
+
+
+ if (is_string($numChannelsOrFileName)) {
+ $this->openWav($numChannelsOrFileName, is_bool($sampleRateOrReadData) ? $sampleRateOrReadData : true);
+
+ } else {
+ $this->setNumChannels(is_null($numChannelsOrFileName) ? 1 : $numChannelsOrFileName)
+ ->setSampleRate(is_null($sampleRateOrReadData) ? 8000 : $sampleRateOrReadData)
+ ->setBitsPerSample(is_null($bitsPerSample) ? 8 : $bitsPerSample);
+ }
+ }
+
+ public function __destruct() {
+ if (is_resource($this->_fp)) $this->closeWav();
+ }
+
+ public function __clone() {
+ $this->_fp = null;
+ }
+
+ /**
+ * Output the wav file headers and data.
+ *
+ * @return string The encoded file.
+ */
+ public function __toString()
+ {
+ return $this->makeHeader() .
+ $this->getDataSubchunk();
+ }
+
+
+ /*%******************************************************************************************%*/
+ // Static methods
+
+ /**
+ * Unpacks a single binary sample to numeric value.
+ *
+ * @param string $sampleBinary (Required) The sample to decode.
+ * @param int $bitDepth (Optional) The bits per sample to decode. If omitted, derives it from the length of $sampleBinary.
+ * @return int|float|null The numeric sample value. Float for 32-bit samples. Returns null for unsupported bit depths.
+ */
+ public static function unpackSample($sampleBinary, $bitDepth = null)
+ {
+ if ($bitDepth === null) {
+ $bitDepth = strlen($sampleBinary) * 8;
+ }
+
+ switch ($bitDepth) {
+ case 8:
+ // unsigned char
+ return ord($sampleBinary);
+
+ case 16:
+ // signed short, little endian
+ $data = unpack('v', $sampleBinary);
+ $sample = $data[1];
+ if ($sample >= 0x8000) {
+ $sample -= 0x10000;
+ }
+ return $sample;
+
+ case 24:
+ // 3 byte packed signed integer, little endian
+ $data = unpack('C3', $sampleBinary);
+ $sample = $data[1] | ($data[2] << 8) | ($data[3] << 16);
+ if ($sample >= 0x800000) {
+ $sample -= 0x1000000;
+ }
+ return $sample;
+
+ case 32:
+ // 32-bit float
+ $data = unpack('f', $sampleBinary);
+ return $data[1];
+
+ default:
+ return null;
+ }
+ }
+
+ /**
+ * Packs a single numeric sample to binary.
+ *
+ * @param int|float $sample (Required) The sample to encode. Has to be within valid range for $bitDepth. Float values only for 32 bits.
+ * @param int $bitDepth (Required) The bits per sample to encode with.
+ * @return string|null The encoded binary sample. Returns null for unsupported bit depths.
+ */
+ public static function packSample($sample, $bitDepth)
+ {
+ switch ($bitDepth) {
+ case 8:
+ // unsigned char
+ return chr($sample);
+
+ case 16:
+ // signed short, little endian
+ if ($sample < 0) {
+ $sample += 0x10000;
+ }
+ return pack('v', $sample);
+
+ case 24:
+ // 3 byte packed signed integer, little endian
+ if ($sample < 0) {
+ $sample += 0x1000000;
+ }
+ return pack('C3', $sample & 0xff, ($sample >> 8) & 0xff, ($sample >> 16) & 0xff);
+
+ case 32:
+ // 32-bit float
+ return pack('f', $sample);
+
+ default:
+ return null;
+ }
+ }
+
+ /**
+ * Unpacks a binary sample block to numeric values.
+ *
+ * @param string $sampleBlock (Required) The binary sample block (all channels).
+ * @param int $bitDepth (Required) The bits per sample to decode.
+ * @param int $numChannels (Optional) The number of channels to decode. If omitted, derives it from the length of $sampleBlock and $bitDepth.
+ * @return array The sample values as an array of integers of floats for 32 bits. First channel is array index 1.
+ */
+ public static function unpackSampleBlock($sampleBlock, $bitDepth, $numChannels = null) {
+ $sampleBytes = $bitDepth / 8;
+ if ($numChannels === null) {
+ $numChannels = strlen($sampleBlock) / $sampleBytes;
+ }
+
+ $samples = array();
+ for ($i = 0; $i < $numChannels; $i++) {
+ $sampleBinary = substr($sampleBlock, $i * $sampleBytes, $sampleBytes);
+ $samples[$i + 1] = self::unpackSample($sampleBinary, $bitDepth);
+ }
+
+ return $samples;
+ }
+
+ /**
+ * Packs an array of numeric channel samples to a binary sample block.
+ *
+ * @param array $samples (Required) The array of channel sample values. Expects float values for 32 bits and integer otherwise.
+ * @param int $bitDepth (Required) The bits per sample to encode with.
+ * @return string The encoded binary sample block.
+ */
+ public static function packSampleBlock($samples, $bitDepth) {
+ $sampleBlock = '';
+ foreach($samples as $sample) {
+ $sampleBlock .= self::packSample($sample, $bitDepth);
+ }
+
+ return $sampleBlock;
+ }
+
+ /**
+ * Normalizes a float audio sample. Maximum input range assumed for compression is [-2, 2].
+ * See http://www.voegler.eu/pub/audio/ for more information.
+ *
+ * @param float $sampleFloat (Required) The float sample to normalize.
+ * @param float $threshold (Required) The threshold or gain factor for normalizing the amplitude. <ul>
+ * <li> >= 1 - Normalize by multiplying by the threshold (boost - positive gain). <br />
+ * A value of 1 in effect means no normalization (and results in clipping). </li>
+ * <li> <= -1 - Normalize by dividing by the the absolute value of threshold (attenuate - negative gain). <br />
+ * A factor of 2 (-2) is about 6dB reduction in volume.</li>
+ * <li> [0, 1) - (open inverval - not including 1) - The threshold
+ * above which amplitudes are comressed logarithmically. <br />
+ * e.g. 0.6 to leave amplitudes up to 60% "as is" and compress above. </li>
+ * <li> (-1, 0) - (open inverval - not including -1 and 0) - The threshold
+ * above which amplitudes are comressed linearly. <br />
+ * e.g. -0.6 to leave amplitudes up to 60% "as is" and compress above. </li></ul>
+ * @return float The normalized sample.
+ **/
+ public static function normalizeSample($sampleFloat, $threshold) {
+ // apply positive gain
+ if ($threshold >= 1) {
+ return $sampleFloat * $threshold;
+ }
+
+ // apply negative gain
+ if ($threshold <= -1) {
+ return $sampleFloat / -$threshold;
+ }
+
+ $sign = $sampleFloat < 0 ? -1 : 1;
+ $sampleAbs = abs($sampleFloat);
+
+ // logarithmic compression
+ if ($threshold >= 0 && $threshold < 1 && $sampleAbs > $threshold) {
+ $loga = self::$LOOKUP_LOGBASE[(int)($threshold * 20)]; // log base modifier
+ return $sign * ($threshold + (1 - $threshold) * log(1 + $loga * ($sampleAbs - $threshold) / (2 - $threshold)) / log(1 + $loga));
+ }
+
+ // linear compression
+ $thresholdAbs = abs($threshold);
+ if ($threshold > -1 && $threshold < 0 && $sampleAbs > $thresholdAbs) {
+ return $sign * ($thresholdAbs + (1 - $thresholdAbs) / (2 - $thresholdAbs) * ($sampleAbs - $thresholdAbs));
+ }
+
+ // else ?
+ return $sampleFloat;
+ }
+
+
+ /*%******************************************************************************************%*/
+ // Getter and Setter methods for properties
+
+ public function getActualSize() {
+ return $this->_actualSize;
+ }
+
+ /** @param int $actualSize */
+ protected function setActualSize($actualSize = null) {
+ if (is_null($actualSize)) {
+ $this->_actualSize = 8 + $this->_chunkSize; // + "RIFF" header (ID + size)
+ } else {
+ $this->_actualSize = $actualSize;
+ }
+
+ return $this;
+ }
+
+ public function getChunkSize() {
+ return $this->_chunkSize;
+ }
+
+ /** @param int $chunkSize */
+ protected function setChunkSize($chunkSize = null) {
+ if (is_null($chunkSize)) {
+ $this->_chunkSize = 4 + // "WAVE" chunk
+ 8 + $this->_fmtChunkSize + // "fmt " subchunk
+ ($this->_factChunkSize > 0 ? 8 + $this->_factChunkSize : 0) + // "fact" subchunk
+ 8 + $this->_dataSize + // "data" subchunk
+ ($this->_dataSize & 1); // padding byte
+ } else {
+ $this->_chunkSize = $chunkSize;
+ }
+
+ $this->setActualSize();
+
+ return $this;
+ }
+
+ public function getFmtChunkSize() {
+ return $this->_fmtChunkSize;
+ }
+
+ /** @param int $fmtChunkSize */
+ protected function setFmtChunkSize($fmtChunkSize = null) {
+ if (is_null($fmtChunkSize)) {
+ $this->_fmtChunkSize = 16 + $this->_fmtExtendedSize;
+ } else {
+ $this->_fmtChunkSize = $fmtChunkSize;
+ }
+
+ $this->setChunkSize() // implicit setActualSize()
+ ->setDataOffset();
+
+ return $this;
+ }
+
+ public function getFmtExtendedSize() {
+ return $this->_fmtExtendedSize;
+ }
+
+ /** @param int $fmtExtendedSize */
+ protected function setFmtExtendedSize($fmtExtendedSize = null) {
+ if (is_null($fmtExtendedSize)) {
+ if ($this->_audioFormat == self::WAVE_FORMAT_EXTENSIBLE) {
+ $this->_fmtExtendedSize = 2 + 22; // extension size for WAVE_FORMAT_EXTENSIBLE
+ } elseif ($this->_audioFormat != self::WAVE_FORMAT_PCM) {
+ $this->_fmtExtendedSize = 2 + 0; // empty extension
+ } else {
+ $this->_fmtExtendedSize = 0; // no extension, only for WAVE_FORMAT_PCM
+ }
+ } else {
+ $this->_fmtExtendedSize = $fmtExtendedSize;
+ }
+
+ $this->setFmtChunkSize(); // implicit setSize(), setActualSize(), setDataOffset()
+
+ return $this;
+ }
+
+ public function getFactChunkSize() {
+ return $this->_factChunkSize;
+ }
+
+ /** @param int $factChunkSize */
+ protected function setFactChunkSize($factChunkSize = null) {
+ if (is_null($factChunkSize)) {
+ if ($this->_audioFormat != self::WAVE_FORMAT_PCM) {
+ $this->_factChunkSize = 4;
+ } else {
+ $this->_factChunkSize = 0;
+ }
+ } else {
+ $this->_factChunkSize = $factChunkSize;
+ }
+
+ $this->setChunkSize() // implicit setActualSize()
+ ->setDataOffset();
+
+ return $this;
+ }
+
+ public function getDataSize() {
+ return $this->_dataSize;
+ }
+
+ /** @param int $dataSize */
+ protected function setDataSize($dataSize = null) {
+ if (is_null($dataSize)) {
+ $this->_dataSize = strlen($this->_samples);
+ } else {
+ $this->_dataSize = $dataSize;
+ }
+
+ $this->setChunkSize() // implicit setActualSize()
+ ->setNumBlocks();
+ $this->_dataSize_valid = true;
+
+ return $this;
+ }
+
+ public function getDataOffset() {
+ return $this->_dataOffset;
+ }
+
+ /** @param int $dataOffset */
+ protected function setDataOffset($dataOffset = null) {
+ if (is_null($dataOffset)) {
+ $this->_dataOffset = 8 + // "RIFF" header (ID + size)
+ 4 + // "WAVE" chunk
+ 8 + $this->_fmtChunkSize + // "fmt " subchunk
+ ($this->_factChunkSize > 0 ? 8 + $this->_factChunkSize : 0) + // "fact" subchunk
+ 8; // "data" subchunk
+ } else {
+ $this->_dataOffset = $dataOffset;
+ }
+
+ return $this;
+ }
+
+ public function getAudioFormat() {
+ return $this->_audioFormat;
+ }
+
+ /** @param int $audioFormat */
+ protected function setAudioFormat($audioFormat = null) {
+ if (is_null($audioFormat)) {
+ if (($this->_bitsPerSample <= 16 || $this->_bitsPerSample == 32)
+ && $this->_validBitsPerSample == $this->_bitsPerSample
+ && $this->_channelMask == self::SPEAKER_DEFAULT
+ && $this->_numChannels <= 2) {
+ if ($this->_bitsPerSample <= 16) {
+ $this->_audioFormat = self::WAVE_FORMAT_PCM;
+ } else {
+ $this->_audioFormat = self::WAVE_FORMAT_IEEE_FLOAT;
+ }
+ } else {
+ $this->_audioFormat = self::WAVE_FORMAT_EXTENSIBLE;
+ }
+ } else {
+ $this->_audioFormat = $audioFormat;
+ }
+
+ $this->setAudioSubFormat()
+ ->setFactChunkSize() // implicit setSize(), setActualSize(), setDataOffset()
+ ->setFmtExtendedSize(); // implicit setFmtChunkSize(), setSize(), setActualSize(), setDataOffset()
+
+ return $this;
+ }
+
+ public function getAudioSubFormat() {
+ return $this->_audioSubFormat;
+ }
+
+ /** @param int $audioSubFormat */
+ protected function setAudioSubFormat($audioSubFormat = null) {
+ if (is_null($audioSubFormat)) {
+ if ($this->_bitsPerSample == 32) {
+ $this->_audioSubFormat = self::WAVE_SUBFORMAT_IEEE_FLOAT; // 32 bits are IEEE FLOAT in this class
+ } else {
+ $this->_audioSubFormat = self::WAVE_SUBFORMAT_PCM; // 8, 16 and 24 bits are PCM in this class
+ }
+ } else {
+ $this->_audioSubFormat = $audioSubFormat;
+ }
+
+ return $this;
+ }
+
+ public function getNumChannels() {
+ return $this->_numChannels;
+ }
+
+ /** @param int $numChannels */
+ public function setNumChannels($numChannels) {
+ if ($numChannels < 1 || $numChannels > self::MAX_CHANNEL) {
+ throw new WavFileException('Unsupported number of channels. Only up to ' . self::MAX_CHANNEL . ' channels are supported.');
+ } elseif ($this->_samples !== '') {
+ trigger_error('Wav already has sample data. Changing the number of channels does not convert and may corrupt the data.', E_USER_NOTICE);
+ }
+
+ $this->_numChannels = (int)$numChannels;
+
+ $this->setAudioFormat() // implicit setAudioSubFormat(), setFactChunkSize(), setFmtExtendedSize(), setFmtChunkSize(), setSize(), setActualSize(), setDataOffset()
+ ->setByteRate()
+ ->setBlockAlign(); // implicit setNumBlocks()
+
+ return $this;
+ }
+
+ public function getChannelMask() {
+ return $this->_channelMask;
+ }
+
+ public function setChannelMask($channelMask = self::SPEAKER_DEFAULT) {
+ if ($channelMask != 0) {
+ // count number of set bits - Hamming weight
+ $c = (int)$channelMask;
+ $n = 0;
+ while ($c > 0) {
+ $n += $c & 1;
+ $c >>= 1;
+ }
+ if ($n != $this->_numChannels || (((int)$channelMask | self::SPEAKER_ALL) != self::SPEAKER_ALL)) {
+ throw new WavFileException('Invalid channel mask. The number of channels does not match the number of locations in the mask.');
+ }
+ }
+
+ $this->_channelMask = (int)$channelMask;
+
+ $this->setAudioFormat(); // implicit setAudioSubFormat(), setFactChunkSize(), setFmtExtendedSize(), setFmtChunkSize(), setSize(), setActualSize(), setDataOffset()
+
+ return $this;
+ }
+
+ public function getSampleRate() {
+ return $this->_sampleRate;
+ }
+
+ public function setSampleRate($sampleRate) {
+ if ($sampleRate < 1 || $sampleRate > self::MAX_SAMPLERATE) {
+ throw new WavFileException('Invalid sample rate.');
+ } elseif ($this->_samples !== '') {
+ trigger_error('Wav already has sample data. Changing the sample rate does not convert the data and may yield undesired results.', E_USER_NOTICE);
+ }
+
+ $this->_sampleRate = (int)$sampleRate;
+
+ $this->setByteRate();
+
+ return $this;
+ }
+
+ public function getBitsPerSample() {
+ return $this->_bitsPerSample;
+ }
+
+ public function setBitsPerSample($bitsPerSample) {
+ if (!in_array($bitsPerSample, array(8, 16, 24, 32))) {
+ throw new WavFileException('Unsupported bits per sample. Only 8, 16, 24 and 32 bits are supported.');
+ } elseif ($this->_samples !== '') {
+ trigger_error('Wav already has sample data. Changing the bits per sample does not convert and may corrupt the data.', E_USER_NOTICE);
+ }
+
+ $this->_bitsPerSample = (int)$bitsPerSample;
+
+ $this->setValidBitsPerSample() // implicit setAudioFormat(), setAudioSubFormat(), setFmtChunkSize(), setFactChunkSize(), setSize(), setActualSize(), setDataOffset()
+ ->setByteRate()
+ ->setBlockAlign(); // implicit setNumBlocks()
+
+ return $this;
+ }
+
+ public function getValidBitsPerSample() {
+ return $this->_validBitsPerSample;
+ }
+
+ protected function setValidBitsPerSample($validBitsPerSample = null) {
+ if (is_null($validBitsPerSample)) {
+ $this->_validBitsPerSample = $this->_bitsPerSample;
+ } else {
+ if ($validBitsPerSample < 1 || $validBitsPerSample > $this->_bitsPerSample) {
+ throw new WavFileException('ValidBitsPerSample cannot be greater than BitsPerSample.');
+ }
+ $this->_validBitsPerSample = (int)$validBitsPerSample;
+ }
+
+ $this->setAudioFormat(); // implicit setAudioSubFormat(), setFactChunkSize(), setFmtExtendedSize(), setFmtChunkSize(), setSize(), setActualSize(), setDataOffset()
+
+ return $this;
+ }
+
+ public function getBlockAlign() {
+ return $this->_blockAlign;
+ }
+
+ /** @param int $blockAlign */
+ protected function setBlockAlign($blockAlign = null) {
+ if (is_null($blockAlign)) {
+ $this->_blockAlign = $this->_numChannels * $this->_bitsPerSample / 8;
+ } else {
+ $this->_blockAlign = $blockAlign;
+ }
+
+ $this->setNumBlocks();
+
+ return $this;
+ }
+
+ public function getNumBlocks()
+ {
+ return $this->_numBlocks;
+ }
+
+ /** @param int $numBlocks */
+ protected function setNumBlocks($numBlocks = null) {
+ if (is_null($numBlocks)) {
+ $this->_numBlocks = (int)($this->_dataSize / $this->_blockAlign); // do not count incomplete sample blocks
+ } else {
+ $this->_numBlocks = $numBlocks;
+ }
+
+ return $this;
+ }
+
+ public function getByteRate() {
+ return $this->_byteRate;
+ }
+
+ /** @param int $byteRate */
+ protected function setByteRate($byteRate = null) {
+ if (is_null($byteRate)) {
+ $this->_byteRate = $this->_sampleRate * $this->_numChannels * $this->_bitsPerSample / 8;
+ } else {
+ $this->_byteRate = $byteRate;
+ }
+
+ return $this;
+ }
+
+ public function getIgnoreChunkSizes()
+ {
+ return $this->_ignoreChunkSizes;
+ }
+
+ public function setIgnoreChunkSizes($ignoreChunkSizes)
+ {
+ $this->_ignoreChunkSizes = (bool)$ignoreChunkSizes;
+ return $this;
+ }
+
+ public function getSamples() {
+ return $this->_samples;
+ }
+
+ public function setSamples(&$samples = '') {
+ if (strlen($samples) % $this->_blockAlign != 0) {
+ throw new WavFileException('Incorrect samples size. Has to be a multiple of BlockAlign.');
+ }
+
+ $this->_samples = $samples;
+
+ $this->setDataSize(); // implicit setSize(), setActualSize(), setNumBlocks()
+
+ return $this;
+ }
+
+
+ /*%******************************************************************************************%*/
+ // Getters
+
+ public function getMinAmplitude()
+ {
+ if ($this->_bitsPerSample == 8) {
+ return 0;
+ } elseif ($this->_bitsPerSample == 32) {
+ return -1.0;
+ } else {
+ return -(1 << ($this->_bitsPerSample - 1));
+ }
+ }
+
+ public function getZeroAmplitude()
+ {
+ if ($this->_bitsPerSample == 8) {
+ return 0x80;
+ } elseif ($this->_bitsPerSample == 32) {
+ return 0.0;
+ } else {
+ return 0;
+ }
+ }
+
+ public function getMaxAmplitude()
+ {
+ if($this->_bitsPerSample == 8) {
+ return 0xFF;
+ } elseif($this->_bitsPerSample == 32) {
+ return 1.0;
+ } else {
+ return (1 << ($this->_bitsPerSample - 1)) - 1;
+ }
+ }
+
+
+ /*%******************************************************************************************%*/
+ // Wave file methods
+
+ /**
+ * Construct a wav header from this object. Includes "fact" chunk if necessary.
+ * http://www-mmsp.ece.mcgill.ca/documents/audioformats/wave/wave.html
+ *
+ * @return string The RIFF header data.
+ */
+ public function makeHeader()
+ {
+ // reset and recalculate
+ $this->setAudioFormat(); // implicit setAudioSubFormat(), setFactChunkSize(), setFmtExtendedSize(), setFmtChunkSize(), setSize(), setActualSize(), setDataOffset()
+ $this->setNumBlocks();
+
+ // RIFF header
+ $header = pack('N', 0x52494646); // ChunkID - "RIFF"
+ $header .= pack('V', $this->getChunkSize()); // ChunkSize
+ $header .= pack('N', 0x57415645); // Format - "WAVE"
+
+ // "fmt " subchunk
+ $header .= pack('N', 0x666d7420); // SubchunkID - "fmt "
+ $header .= pack('V', $this->getFmtChunkSize()); // SubchunkSize
+ $header .= pack('v', $this->getAudioFormat()); // AudioFormat
+ $header .= pack('v', $this->getNumChannels()); // NumChannels
+ $header .= pack('V', $this->getSampleRate()); // SampleRate
+ $header .= pack('V', $this->getByteRate()); // ByteRate
+ $header .= pack('v', $this->getBlockAlign()); // BlockAlign
+ $header .= pack('v', $this->getBitsPerSample()); // BitsPerSample
+ if($this->getFmtExtendedSize() == 24) {
+ $header .= pack('v', 22); // extension size = 24 bytes, cbSize: 24 - 2 = 22 bytes
+ $header .= pack('v', $this->getValidBitsPerSample()); // ValidBitsPerSample
+ $header .= pack('V', $this->getChannelMask()); // ChannelMask
+ $header .= pack('H32', $this->getAudioSubFormat()); // SubFormat
+ } elseif ($this->getFmtExtendedSize() == 2) {
+ $header .= pack('v', 0); // extension size = 2 bytes, cbSize: 2 - 2 = 0 bytes
+ }
+
+ // "fact" subchunk
+ if ($this->getFactChunkSize() == 4) {
+ $header .= pack('N', 0x66616374); // SubchunkID - "fact"
+ $header .= pack('V', 4); // SubchunkSize
+ $header .= pack('V', $this->getNumBlocks()); // SampleLength (per channel)
+ }
+
+ return $header;
+ }
+
+ /**
+ * Construct wav DATA chunk.
+ *
+ * @return string The DATA header and chunk.
+ */
+ public function getDataSubchunk()
+ {
+ // check preconditions
+ if (!$this->_dataSize_valid) {
+ $this->setDataSize(); // implicit setSize(), setActualSize(), setNumBlocks()
+ }
+
+
+ // create subchunk
+ return pack('N', 0x64617461) . // SubchunkID - "data"
+ pack('V', $this->getDataSize()) . // SubchunkSize
+ $this->_samples . // Subchunk data
+ ($this->getDataSize() & 1 ? chr(0) : ''); // padding byte
+ }
+
+ /**
+ * Save the wav data to a file.
+ *
+ * @param string $filename (Required) The file path to save the wav to.
+ * @throws WavFileException
+ */
+ public function save($filename)
+ {
+ $fp = @fopen($filename, 'w+b');
+ if (!is_resource($fp)) {
+ throw new WavFileException('Failed to open "' . $filename . '" for writing.');
+ }
+
+ fwrite($fp, $this->makeHeader());
+ fwrite($fp, $this->getDataSubchunk());
+ fclose($fp);
+
+ return $this;
+ }
+
+ /**
+ * Reads a wav header and data from a file.
+ *
+ * @param string $filename (Required) The path to the wav file to read.
+ * @param bool $readData (Optional) If true, also read the data chunk.
+ * @throws WavFormatException
+ * @throws WavFileException
+ */
+ public function openWav($filename, $readData = true)
+ {
+ // check preconditions
+ if (!file_exists($filename)) {
+ throw new WavFileException('Failed to open "' . $filename . '". File not found.');
+ } elseif (!is_readable($filename)) {
+ throw new WavFileException('Failed to open "' . $filename . '". File is not readable.');
+ } elseif (is_resource($this->_fp)) {
+ $this->closeWav();
+ }
+
+
+ // open the file
+ $this->_fp = @fopen($filename, 'rb');
+ if (!is_resource($this->_fp)) {
+ throw new WavFileException('Failed to open "' . $filename . '".');
+ }
+
+ // read the file
+ return $this->readWav($readData);
+ }
+
+ /**
+ * Close a with openWav() previously opened wav file or free the buffer of setWavData().
+ * Not necessary if the data has been read (readData = true) already.
+ */
+ public function closeWav() {
+ if (is_resource($this->_fp)) fclose($this->_fp);
+
+ return $this;
+ }
+
+ /**
+ * Set the wav file data and properties from a wav file in a string.
+ *
+ * @param string $data (Required) The wav file data. Passed by reference.
+ * @param bool $free (Optional) True to free the passed $data after copying.
+ * @throws WavFormatException
+ * @throws WavFileException
+ */
+ public function setWavData(&$data, $free = true)
+ {
+ // check preconditions
+ if (is_resource($this->_fp)) $this->closeWav();
+
+
+ // open temporary stream in memory
+ $this->_fp = @fopen('php://memory', 'w+b');
+ if (!is_resource($this->_fp)) {
+ throw new WavFileException('Failed to open memory stream to write wav data. Use openWav() instead.');
+ }
+
+ // prepare stream
+ fwrite($this->_fp, $data);
+ rewind($this->_fp);
+
+ // free the passed data
+ if ($free) $data = null;
+
+ // read the stream like a file
+ return $this->readWav(true);
+ }
+
+ /**
+ * Read wav file from a stream.
+ *
+ * @param bool $readData (Optional) If true, also read the data chunk.
+ * @throws WavFormatException
+ * @throws WavFileException
+ */
+ protected function readWav($readData = true)
+ {
+ if (!is_resource($this->_fp)) {
+ throw new WavFileException('No wav file open. Use openWav() first.');
+ }
+
+ try {
+ $this->readWavHeader();
+ } catch (WavFileException $ex) {
+ $this->closeWav();
+ throw $ex;
+ }
+
+ if ($readData) return $this->readWavData();
+
+ return $this;
+ }
+
+ /**
+ * Parse a wav header.
+ * http://www-mmsp.ece.mcgill.ca/documents/audioformats/wave/wave.html
+ *
+ * @throws WavFormatException
+ * @throws WavFileException
+ */
+ protected function readWavHeader()
+ {
+ if (!is_resource($this->_fp)) {
+ throw new WavFileException('No wav file open. Use openWav() first.');
+ }
+
+ // get actual file size
+ $stat = fstat($this->_fp);
+ $actualSize = $stat['size'];
+
+ $this->_actualSize = $actualSize;
+
+
+ // read the common header
+ $header = fread($this->_fp, 36); // minimum size of the wav header
+ if (strlen($header) < 36) {
+ throw new WavFormatException('Not wav format. Header too short.', 1);
+ }
+
+
+ // check "RIFF" header
+ $RIFF = unpack('NChunkID/VChunkSize/NFormat', $header);
+
+ if ($RIFF['ChunkID'] != 0x52494646) { // "RIFF"
+ throw new WavFormatException('Not wav format. "RIFF" signature missing.', 2);
+ }
+
+ if ($this->getIgnoreChunkSizes()) {
+ $RIFF['ChunkSize'] = $actualSize - 8;
+ } else if ($actualSize - 8 < $RIFF['ChunkSize']) {
+ trigger_error('"RIFF" chunk size does not match actual file size. Found ' . $RIFF['ChunkSize'] . ', expected ' . ($actualSize - 8) . '.', E_USER_NOTICE);
+ $RIFF['ChunkSize'] = $actualSize - 8;
+ }
+
+ if ($RIFF['Format'] != 0x57415645) { // "WAVE"
+ throw new WavFormatException('Not wav format. "RIFF" chunk format is not "WAVE".', 4);
+ }
+
+ $this->_chunkSize = $RIFF['ChunkSize'];
+
+
+ // check common "fmt " subchunk
+ $fmt = unpack('NSubchunkID/VSubchunkSize/vAudioFormat/vNumChannels/'
+ .'VSampleRate/VByteRate/vBlockAlign/vBitsPerSample',
+ substr($header, 12));
+
+ if ($fmt['SubchunkID'] != 0x666d7420) { // "fmt "
+ throw new WavFormatException('Bad wav header. Expected "fmt " subchunk.', 11);
+ }
+
+ if ($fmt['SubchunkSize'] < 16) {
+ throw new WavFormatException('Bad "fmt " subchunk size.', 12);
+ }
+
+ if ( $fmt['AudioFormat'] != self::WAVE_FORMAT_PCM
+ && $fmt['AudioFormat'] != self::WAVE_FORMAT_IEEE_FLOAT
+ && $fmt['AudioFormat'] != self::WAVE_FORMAT_EXTENSIBLE)
+ {
+ throw new WavFormatException('Unsupported audio format. Only PCM or IEEE FLOAT (EXTENSIBLE) audio is supported.', 13);
+ }
+
+ if ($fmt['NumChannels'] < 1 || $fmt['NumChannels'] > self::MAX_CHANNEL) {
+ throw new WavFormatException('Invalid number of channels in "fmt " subchunk.', 14);
+ }
+
+ if ($fmt['SampleRate'] < 1 || $fmt['SampleRate'] > self::MAX_SAMPLERATE) {
+ throw new WavFormatException('Invalid sample rate in "fmt " subchunk.', 15);
+ }
+
+ if ( ($fmt['AudioFormat'] == self::WAVE_FORMAT_PCM && !in_array($fmt['BitsPerSample'], array(8, 16, 24)))
+ || ($fmt['AudioFormat'] == self::WAVE_FORMAT_IEEE_FLOAT && $fmt['BitsPerSample'] != 32)
+ || ($fmt['AudioFormat'] == self::WAVE_FORMAT_EXTENSIBLE && !in_array($fmt['BitsPerSample'], array(8, 16, 24, 32))))
+ {
+ throw new WavFormatException('Only 8, 16 and 24-bit PCM and 32-bit IEEE FLOAT (EXTENSIBLE) audio is supported.', 16);
+ }
+
+ $blockAlign = $fmt['NumChannels'] * $fmt['BitsPerSample'] / 8;
+ if ($blockAlign != $fmt['BlockAlign']) {
+ trigger_error('Invalid block align in "fmt " subchunk. Found ' . $fmt['BlockAlign'] . ', expected ' . $blockAlign . '.', E_USER_NOTICE);
+ $fmt['BlockAlign'] = $blockAlign;
+ }
+
+ $byteRate = $fmt['SampleRate'] * $blockAlign;
+ if ($byteRate != $fmt['ByteRate']) {
+ trigger_error('Invalid average byte rate in "fmt " subchunk. Found ' . $fmt['ByteRate'] . ', expected ' . $byteRate . '.', E_USER_NOTICE);
+ $fmt['ByteRate'] = $byteRate;
+ }
+
+ $this->_fmtChunkSize = $fmt['SubchunkSize'];
+ $this->_audioFormat = $fmt['AudioFormat'];
+ $this->_numChannels = $fmt['NumChannels'];
+ $this->_sampleRate = $fmt['SampleRate'];
+ $this->_byteRate = $fmt['ByteRate'];
+ $this->_blockAlign = $fmt['BlockAlign'];
+ $this->_bitsPerSample = $fmt['BitsPerSample'];
+
+
+ // read extended "fmt " subchunk data
+ $extendedFmt = '';
+ if ($fmt['SubchunkSize'] > 16) {
+ // possibly handle malformed subchunk without a padding byte
+ $extendedFmt = fread($this->_fp, $fmt['SubchunkSize'] - 16 + ($fmt['SubchunkSize'] & 1)); // also read padding byte
+ if (strlen($extendedFmt) < $fmt['SubchunkSize'] - 16) {
+ throw new WavFormatException('Not wav format. Header too short.', 1);
+ }
+ }
+
+
+ // check extended "fmt " for EXTENSIBLE Audio Format
+ if ($fmt['AudioFormat'] == self::WAVE_FORMAT_EXTENSIBLE) {
+ if (strlen($extendedFmt) < 24) {
+ throw new WavFormatException('Invalid EXTENSIBLE "fmt " subchunk size. Found ' . $fmt['SubchunkSize'] . ', expected at least 40.', 19);
+ }
+
+ $extensibleFmt = unpack('vSize/vValidBitsPerSample/VChannelMask/H32SubFormat', substr($extendedFmt, 0, 24));
+
+ if ( $extensibleFmt['SubFormat'] != self::WAVE_SUBFORMAT_PCM
+ && $extensibleFmt['SubFormat'] != self::WAVE_SUBFORMAT_IEEE_FLOAT)
+ {
+ throw new WavFormatException('Unsupported audio format. Only PCM or IEEE FLOAT (EXTENSIBLE) audio is supported.', 13);
+ }
+
+ if ( ($extensibleFmt['SubFormat'] == self::WAVE_SUBFORMAT_PCM && !in_array($fmt['BitsPerSample'], array(8, 16, 24)))
+ || ($extensibleFmt['SubFormat'] == self::WAVE_SUBFORMAT_IEEE_FLOAT && $fmt['BitsPerSample'] != 32))
+ {
+ throw new WavFormatException('Only 8, 16 and 24-bit PCM and 32-bit IEEE FLOAT (EXTENSIBLE) audio is supported.', 16);
+ }
+
+ if ($extensibleFmt['Size'] != 22) {
+ trigger_error('Invaid extension size in EXTENSIBLE "fmt " subchunk.', E_USER_NOTICE);
+ $extensibleFmt['Size'] = 22;
+ }
+
+ if ($extensibleFmt['ValidBitsPerSample'] != $fmt['BitsPerSample']) {
+ trigger_error('Invaid or unsupported valid bits per sample in EXTENSIBLE "fmt " subchunk.', E_USER_NOTICE);
+ $extensibleFmt['ValidBitsPerSample'] = $fmt['BitsPerSample'];
+ }
+
+ if ($extensibleFmt['ChannelMask'] != 0) {
+ // count number of set bits - Hamming weight
+ $c = (int)$extensibleFmt['ChannelMask'];
+ $n = 0;
+ while ($c > 0) {
+ $n += $c & 1;
+ $c >>= 1;
+ }
+ if ($n != $fmt['NumChannels'] || (((int)$extensibleFmt['ChannelMask'] | self::SPEAKER_ALL) != self::SPEAKER_ALL)) {
+ trigger_error('Invalid channel mask in EXTENSIBLE "fmt " subchunk. The number of channels does not match the number of locations in the mask.', E_USER_NOTICE);
+ $extensibleFmt['ChannelMask'] = 0;
+ }
+ }
+
+ $this->_fmtExtendedSize = strlen($extendedFmt);
+ $this->_validBitsPerSample = $extensibleFmt['ValidBitsPerSample'];
+ $this->_channelMask = $extensibleFmt['ChannelMask'];
+ $this->_audioSubFormat = $extensibleFmt['SubFormat'];
+
+ } else {
+ $this->_fmtExtendedSize = strlen($extendedFmt);
+ $this->_validBitsPerSample = $fmt['BitsPerSample'];
+ $this->_channelMask = 0;
+ $this->_audioSubFormat = null;
+ }
+
+
+ // read additional subchunks until "data" subchunk is found
+ $factSubchunk = array();
+ $dataSubchunk = array();
+
+ while (!feof($this->_fp)) {
+ $subchunkHeader = fread($this->_fp, 8);
+ if (strlen($subchunkHeader) < 8) {
+ throw new WavFormatException('Missing "data" subchunk.', 101);
+ }
+
+ $subchunk = unpack('NSubchunkID/VSubchunkSize', $subchunkHeader);
+
+ if ($subchunk['SubchunkID'] == 0x66616374) { // "fact"
+ // possibly handle malformed subchunk without a padding byte
+ $subchunkData = fread($this->_fp, $subchunk['SubchunkSize'] + ($subchunk['SubchunkSize'] & 1)); // also read padding byte
+ if (strlen($subchunkData) < 4) {
+ throw new WavFormatException('Invalid "fact" subchunk.', 102);
+ }
+
+ $factParams = unpack('VSampleLength', substr($subchunkData, 0, 4));
+ $factSubchunk = array_merge($subchunk, $factParams);
+
+ } elseif ($subchunk['SubchunkID'] == 0x64617461) { // "data"
+ $dataSubchunk = $subchunk;
+
+ break;
+
+ } elseif ($subchunk['SubchunkID'] == 0x7761766C) { // "wavl"
+ throw new WavFormatException('Wave List Chunk ("wavl" subchunk) is not supported.', 106);
+ } else {
+ // skip all other (unknown) subchunks
+ // possibly handle malformed subchunk without a padding byte
+ if ( $subchunk['SubchunkSize'] < 0
+ || fseek($this->_fp, $subchunk['SubchunkSize'] + ($subchunk['SubchunkSize'] & 1), SEEK_CUR) !== 0) { // also skip padding byte
+ throw new WavFormatException('Invalid subchunk (0x' . dechex($subchunk['SubchunkID']) . ') encountered.', 103);
+ }
+ }
+ }
+
+ if (empty($dataSubchunk)) {
+ throw new WavFormatException('Missing "data" subchunk.', 101);
+ }
+
+ // check "data" subchunk
+ $dataOffset = ftell($this->_fp);
+ if ($this->getIgnoreChunkSizes()) {
+ $dataSubchunk['SubchunkSize'] = $actualSize - $dataOffset;
+ } elseif ($dataSubchunk['SubchunkSize'] < 0 || $actualSize - $dataOffset < $dataSubchunk['SubchunkSize']) {
+ trigger_error("Invalid \"data\" subchunk size (found {$dataSubchunk['SubchunkSize']}.", E_USER_NOTICE);
+ $dataSubchunk['SubchunkSize'] = $actualSize - $dataOffset;
+ }
+
+ $this->_dataOffset = $dataOffset;
+ $this->_dataSize = $dataSubchunk['SubchunkSize'];
+ $this->_dataSize_fp = $dataSubchunk['SubchunkSize'];
+ $this->_dataSize_valid = false;
+ $this->_samples = '';
+
+
+ // check "fact" subchunk
+ $numBlocks = (int)($dataSubchunk['SubchunkSize'] / $fmt['BlockAlign']);
+
+ if (empty($factSubchunk)) { // construct fake "fact" subchunk
+ $factSubchunk = array('SubchunkSize' => 0, 'SampleLength' => $numBlocks);
+ }
+
+ if ($factSubchunk['SampleLength'] != $numBlocks) {
+ trigger_error('Invalid sample length in "fact" subchunk.', E_USER_NOTICE);
+ $factSubchunk['SampleLength'] = $numBlocks;
+ }
+
+ $this->_factChunkSize = $factSubchunk['SubchunkSize'];
+ $this->_numBlocks = $factSubchunk['SampleLength'];
+
+
+ return $this;
+
+ }
+
+ /**
+ * Read the wav data from the file into the buffer.
+ *
+ * @param int $dataOffset (Optional) The byte offset to skip before starting to read. Must be a multiple of BlockAlign.
+ * @param int $dataSize (Optional) The size of the data to read in bytes. Must be a multiple of BlockAlign. Defaults to all data.
+ * @throws WavFileException
+ */
+ public function readWavData($dataOffset = 0, $dataSize = null)
+ {
+ // check preconditions
+ if (!is_resource($this->_fp)) {
+ throw new WavFileException('No wav file open. Use openWav() first.');
+ }
+
+ if ($dataOffset < 0 || $dataOffset % $this->getBlockAlign() > 0) {
+ throw new WavFileException('Invalid data offset. Has to be a multiple of BlockAlign.');
+ }
+
+ if (is_null($dataSize)) {
+ $dataSize = $this->_dataSize_fp - ($this->_dataSize_fp % $this->getBlockAlign()); // only read complete blocks
+ } elseif ($dataSize < 0 || $dataSize % $this->getBlockAlign() > 0) {
+ throw new WavFileException('Invalid data size to read. Has to be a multiple of BlockAlign.');
+ }
+
+
+ // skip offset
+ if ($dataOffset > 0 && fseek($this->_fp, $dataOffset, SEEK_CUR) !== 0) {
+ throw new WavFileException('Seeking to data offset failed.');
+ }
+
+ // read data
+ $this->_samples .= fread($this->_fp, $dataSize); // allow appending
+ $this->setDataSize(); // implicit setSize(), setActualSize(), setNumBlocks()
+
+ // close file or memory stream
+ return $this->closeWav();
+ }
+
+
+ /*%******************************************************************************************%*/
+ // Sample manipulation methods
+
+ /**
+ * Return a single sample block from the file.
+ *
+ * @param int $blockNum (Required) The sample block number. Zero based.
+ * @return string|null The binary sample block (all channels). Returns null if the sample block number was out of range.
+ */
+ public function getSampleBlock($blockNum)
+ {
+ // check preconditions
+ if (!$this->_dataSize_valid) {
+ $this->setDataSize(); // implicit setSize(), setActualSize(), setNumBlocks()
+ }
+
+ $offset = $blockNum * $this->_blockAlign;
+ if ($offset + $this->_blockAlign > $this->_dataSize || $offset < 0) {
+ return null;
+ }
+
+
+ // read data
+ return substr($this->_samples, $offset, $this->_blockAlign);
+ }
+
+ /**
+ * Set a single sample block. <br />
+ * Allows to append a sample block.
+ *
+ * @param string $sampleBlock (Required) The binary sample block (all channels).
+ * @param int $blockNum (Required) The sample block number. Zero based.
+ * @throws WavFileException
+ */
+ public function setSampleBlock($sampleBlock, $blockNum)
+ {
+ // check preconditions
+ $blockAlign = $this->_blockAlign;
+ if (!isset($sampleBlock[$blockAlign - 1]) || isset($sampleBlock[$blockAlign])) { // faster than: if (strlen($sampleBlock) != $blockAlign)
+ throw new WavFileException('Incorrect sample block size. Got ' . strlen($sampleBlock) . ', expected ' . $blockAlign . '.');
+ }
+
+ if (!$this->_dataSize_valid) {
+ $this->setDataSize(); // implicit setSize(), setActualSize(), setNumBlocks()
+ }
+
+ $numBlocks = (int)($this->_dataSize / $blockAlign);
+ $offset = $blockNum * $blockAlign;
+ if ($blockNum > $numBlocks || $blockNum < 0) { // allow appending
+ throw new WavFileException('Sample block number is out of range.');
+ }
+
+
+ // replace or append data
+ if ($blockNum == $numBlocks) {
+ // append
+ $this->_samples .= $sampleBlock;
+ $this->_dataSize += $blockAlign;
+ $this->_chunkSize += $blockAlign;
+ $this->_actualSize += $blockAlign;
+ $this->_numBlocks++;
+ } else {
+ // replace
+ for ($i = 0; $i < $blockAlign; ++$i) {
+ $this->_samples[$offset + $i] = $sampleBlock[$i];
+ }
+ }
+
+ return $this;
+ }
+
+ /**
+ * Get a float sample value for a specific sample block and channel number.
+ *
+ * @param int $blockNum (Required) The sample block number to fetch. Zero based.
+ * @param int $channelNum (Required) The channel number within the sample block to fetch. First channel is 1.
+ * @return float|null The float sample value. Returns null if the sample block number was out of range.
+ * @throws WavFileException
+ */
+ public function getSampleValue($blockNum, $channelNum)
+ {
+ // check preconditions
+ if ($channelNum < 1 || $channelNum > $this->_numChannels) {
+ throw new WavFileException('Channel number is out of range.');
+ }
+
+ if (!$this->_dataSize_valid) {
+ $this->setDataSize(); // implicit setSize(), setActualSize(), setNumBlocks()
+ }
+
+ $sampleBytes = $this->_bitsPerSample / 8;
+ $offset = $blockNum * $this->_blockAlign + ($channelNum - 1) * $sampleBytes;
+ if ($offset + $sampleBytes > $this->_dataSize || $offset < 0) {
+ return null;
+ }
+
+ // read binary value
+ $sampleBinary = substr($this->_samples, $offset, $sampleBytes);
+
+ // convert binary to value
+ switch ($this->_bitsPerSample) {
+ case 8:
+ // unsigned char
+ return (float)((ord($sampleBinary) - 0x80) / 0x80);
+
+ case 16:
+ // signed short, little endian
+ $data = unpack('v', $sampleBinary);
+ $sample = $data[1];
+ if ($sample >= 0x8000) {
+ $sample -= 0x10000;
+ }
+ return (float)($sample / 0x8000);
+
+ case 24:
+ // 3 byte packed signed integer, little endian
+ $data = unpack('C3', $sampleBinary);
+ $sample = $data[1] | ($data[2] << 8) | ($data[3] << 16);
+ if ($sample >= 0x800000) {
+ $sample -= 0x1000000;
+ }
+ return (float)($sample / 0x800000);
+
+ case 32:
+ // 32-bit float
+ $data = unpack('f', $sampleBinary);
+ return (float)$data[1];
+
+ default:
+ return null;
+ }
+ }
+
+ /**
+ * Sets a float sample value for a specific sample block number and channel. <br />
+ * Converts float values to appropriate integer values and clips properly. <br />
+ * Allows to append samples (in order).
+ *
+ * @param float $sampleFloat (Required) The float sample value to set. Converts float values and clips if necessary.
+ * @param int $blockNum (Required) The sample block number to set or append. Zero based.
+ * @param int $channelNum (Required) The channel number within the sample block to set or append. First channel is 1.
+ * @throws WavFileException
+ */
+ public function setSampleValue($sampleFloat, $blockNum, $channelNum)
+ {
+ // check preconditions
+ if ($channelNum < 1 || $channelNum > $this->_numChannels) {
+ throw new WavFileException('Channel number is out of range.');
+ }
+
+ if (!$this->_dataSize_valid) {
+ $this->setDataSize(); // implicit setSize(), setActualSize(), setNumBlocks()
+ }
+
+ $dataSize = $this->_dataSize;
+ $bitsPerSample = $this->_bitsPerSample;
+ $sampleBytes = $bitsPerSample / 8;
+ $offset = $blockNum * $this->_blockAlign + ($channelNum - 1) * $sampleBytes;
+ if (($offset + $sampleBytes > $dataSize && $offset != $dataSize) || $offset < 0) { // allow appending
+ throw new WavFileException('Sample block or channel number is out of range.');
+ }
+
+
+ // convert to value, quantize and clip
+ if ($bitsPerSample == 32) {
+ $sample = $sampleFloat < -1.0 ? -1.0 : ($sampleFloat > 1.0 ? 1.0 : $sampleFloat);
+ } else {
+ $p = 1 << ($bitsPerSample - 1); // 2 to the power of _bitsPerSample divided by 2
+
+ // project and quantize (round) float to integer values
+ $sample = $sampleFloat < 0 ? (int)($sampleFloat * $p - 0.5) : (int)($sampleFloat * $p + 0.5);
+
+ // clip if necessary to [-$p, $p - 1]
+ if ($sample < -$p) {
+ $sample = -$p;
+ } elseif ($sample > $p - 1) {
+ $sample = $p - 1;
+ }
+ }
+
+ // convert to binary
+ switch ($bitsPerSample) {
+ case 8:
+ // unsigned char
+ $sampleBinary = chr($sample + 0x80);
+ break;
+
+ case 16:
+ // signed short, little endian
+ if ($sample < 0) {
+ $sample += 0x10000;
+ }
+ $sampleBinary = pack('v', $sample);
+ break;
+
+ case 24:
+ // 3 byte packed signed integer, little endian
+ if ($sample < 0) {
+ $sample += 0x1000000;
+ }
+ $sampleBinary = pack('C3', $sample & 0xff, ($sample >> 8) & 0xff, ($sample >> 16) & 0xff);
+ break;
+
+ case 32:
+ // 32-bit float
+ $sampleBinary = pack('f', $sample);
+ break;
+
+ default:
+ $sampleBinary = null;
+ $sampleBytes = 0;
+ break;
+ }
+
+ // replace or append data
+ if ($offset == $dataSize) {
+ // append
+ $this->_samples .= $sampleBinary;
+ $this->_dataSize += $sampleBytes;
+ $this->_chunkSize += $sampleBytes;
+ $this->_actualSize += $sampleBytes;
+ $this->_numBlocks = (int)($this->_dataSize / $this->_blockAlign);
+ } else {
+ // replace
+ for ($i = 0; $i < $sampleBytes; ++$i) {
+ $this->_samples{$offset + $i} = $sampleBinary{$i};
+ }
+ }
+
+ return $this;
+ }
+
+
+ /*%******************************************************************************************%*/
+ // Audio processing methods
+
+ /**
+ * Run samples through audio processing filters.
+ *
+ * <code>
+ * $wav->filter(
+ * array(
+ * WavFile::FILTER_MIX => array( // Filter for mixing 2 WavFile instances.
+ * 'wav' => $wav2, // (Required) The WavFile to mix into this WhavFile. If no optional arguments are given, can be passed without the array.
+ * 'loop' => true, // (Optional) Loop the selected portion (with warping to the beginning at the end).
+ * 'blockOffset' => 0, // (Optional) Block number to start mixing from.
+ * 'numBlocks' => null // (Optional) Number of blocks to mix in or to select for looping. Defaults to the end or all data for looping.
+ * ),
+ * WavFile::FILTER_NORMALIZE => 0.6, // (Required) Normalization of (mixed) audio samples - see threshold parameter for normalizeSample().
+ * WavFile::FILTER_DEGRADE => 0.9 // (Required) Introduce random noise. The quality relative to the amplitude. 1 = no noise, 0 = max. noise.
+ * WavFile::FILTER_VOLUME => 1.0 // (Required) Amplify or attenuate the audio signal. Beware of clipping when amplifying. Values range from >= 0 - <= 2. 1 = no change in volume; 0.5 = 50% reduction of volume; 1.5 = 150% increase in volume.
+ * ),
+ * 0, // (Optional) The block number of this WavFile to start with.
+ * null // (Optional) The number of blocks to process.
+ * );
+ * </code>
+ *
+ * @param array $filters (Required) An array of 1 or more audio processing filters.
+ * @param int $blockOffset (Optional) The block number to start precessing from.
+ * @param int $numBlocks (Optional) The maximum number of blocks to process.
+ * @throws WavFileException
+ */
+ public function filter($filters, $blockOffset = 0, $numBlocks = null)
+ {
+ // check preconditions
+ $totalBlocks = $this->getNumBlocks();
+ $numChannels = $this->getNumChannels();
+ if (is_null($numBlocks)) $numBlocks = $totalBlocks - $blockOffset;
+
+ if (!is_array($filters) || empty($filters) || $blockOffset < 0 || $blockOffset > $totalBlocks || $numBlocks <= 0) {
+ // nothing to do
+ return $this;
+ }
+
+ // check filtes
+ $filter_mix = false;
+ if (array_key_exists(self::FILTER_MIX, $filters)) {
+ if (!is_array($filters[self::FILTER_MIX])) {
+ // assume the 'wav' parameter
+ $filters[self::FILTER_MIX] = array('wav' => $filters[self::FILTER_MIX]);
+ }
+
+ $mix_wav = @$filters[self::FILTER_MIX]['wav'];
+ if (!($mix_wav instanceof WavFile)) {
+ throw new WavFileException("WavFile to mix is missing or invalid.");
+ } elseif ($mix_wav->getSampleRate() != $this->getSampleRate()) {
+ throw new WavFileException("Sample rate of WavFile to mix does not match.");
+ } else if ($mix_wav->getNumChannels() != $this->getNumChannels()) {
+ throw new WavFileException("Number of channels of WavFile to mix does not match.");
+ }
+
+ $mix_loop = @$filters[self::FILTER_MIX]['loop'];
+ if (is_null($mix_loop)) $mix_loop = false;
+
+ $mix_blockOffset = @$filters[self::FILTER_MIX]['blockOffset'];
+ if (is_null($mix_blockOffset)) $mix_blockOffset = 0;
+
+ $mix_totalBlocks = $mix_wav->getNumBlocks();
+ $mix_numBlocks = @$filters[self::FILTER_MIX]['numBlocks'];
+ if (is_null($mix_numBlocks)) $mix_numBlocks = $mix_loop ? $mix_totalBlocks : $mix_totalBlocks - $mix_blockOffset;
+ $mix_maxBlock = min($mix_blockOffset + $mix_numBlocks, $mix_totalBlocks);
+
+ $filter_mix = true;
+ }
+
+ $filter_normalize = false;
+ if (array_key_exists(self::FILTER_NORMALIZE, $filters)) {
+ $normalize_threshold = @$filters[self::FILTER_NORMALIZE];
+
+ if (!is_null($normalize_threshold) && abs($normalize_threshold) != 1) $filter_normalize = true;
+ }
+
+ $filter_degrade = false;
+ if (array_key_exists(self::FILTER_DEGRADE, $filters)) {
+ $degrade_quality = @$filters[self::FILTER_DEGRADE];
+ if (is_null($degrade_quality)) $degrade_quality = 1;
+
+ if ($degrade_quality >= 0 && $degrade_quality < 1) $filter_degrade = true;
+ }
+
+ $filter_vol = false;
+ if (array_key_exists(self::FILTER_VOLUME, $filters)) {
+ $volume_amount = @$filters[self::FILTER_VOLUME];
+ if (is_null($volume_amount)) $volume_amount = 1;
+
+ if ($volume_amount >= 0 && $volume_amount <= 2 && $volume_amount != 1.0) {
+ $filter_vol = true;
+ }
+ }
+
+
+ // loop through all sample blocks
+ for ($block = 0; $block < $numBlocks; ++$block) {
+ // loop through all channels
+ for ($channel = 1; $channel <= $numChannels; ++$channel) {
+ // read current sample
+ $currentBlock = $blockOffset + $block;
+ $sampleFloat = $this->getSampleValue($currentBlock, $channel);
+
+
+ /************* MIX FILTER ***********************/
+ if ($filter_mix) {
+ if ($mix_loop) {
+ $mixBlock = ($mix_blockOffset + ($block % $mix_numBlocks)) % $mix_totalBlocks;
+ } else {
+ $mixBlock = $mix_blockOffset + $block;
+ }
+
+ if ($mixBlock < $mix_maxBlock) {
+ $sampleFloat += $mix_wav->getSampleValue($mixBlock, $channel);
+ }
+ }
+
+ /************* NORMALIZE FILTER *******************/
+ if ($filter_normalize) {
+ $sampleFloat = $this->normalizeSample($sampleFloat, $normalize_threshold);
+ }
+
+ /************* DEGRADE FILTER *******************/
+ if ($filter_degrade) {
+ $sampleFloat += rand(1000000 * ($degrade_quality - 1), 1000000 * (1 - $degrade_quality)) / 1000000;
+ }
+
+ /************* VOLUME FILTER *******************/
+ if ($filter_vol) {
+ $sampleFloat *= $volume_amount;
+ }
+
+ // write current sample
+ $this->setSampleValue($sampleFloat, $currentBlock, $channel);
+ }
+ }
+
+ return $this;
+ }
+
+ /**
+ * Append a wav file to the current wav. <br />
+ * The wav files must have the same sample rate, number of bits per sample, and number of channels.
+ *
+ * @param WavFile $wav (Required) The wav file to append.
+ * @throws WavFileException
+ */
+ public function appendWav(WavFile $wav) {
+ // basic checks
+ if ($wav->getSampleRate() != $this->getSampleRate()) {
+ throw new WavFileException("Sample rate for wav files do not match.");
+ } else if ($wav->getBitsPerSample() != $this->getBitsPerSample()) {
+ throw new WavFileException("Bits per sample for wav files do not match.");
+ } else if ($wav->getNumChannels() != $this->getNumChannels()) {
+ throw new WavFileException("Number of channels for wav files do not match.");
+ }
+
+ $this->_samples .= $wav->_samples;
+ $this->setDataSize(); // implicit setSize(), setActualSize(), setNumBlocks()
+
+ return $this;
+ }
+
+ /**
+ * Mix 2 wav files together. <br />
+ * Both wavs must have the same sample rate and same number of channels.
+ *
+ * @param WavFile $wav (Required) The WavFile to mix.
+ * @param float $normalizeThreshold (Optional) See normalizeSample for an explanation.
+ * @throws WavFileException
+ */
+ public function mergeWav(WavFile $wav, $normalizeThreshold = null) {
+ return $this->filter(array(
+ WavFile::FILTER_MIX => $wav,
+ WavFile::FILTER_NORMALIZE => $normalizeThreshold
+ ));
+ }
+
+ /**
+ * Add silence to the wav file.
+ *
+ * @param float $duration (Optional) How many seconds of silence. If negative, add to the beginning of the file. Defaults to 1s.
+ */
+ public function insertSilence($duration = 1.0)
+ {
+ $numSamples = (int)($this->getSampleRate() * abs($duration));
+ $numChannels = $this->getNumChannels();
+
+ $data = str_repeat(self::packSample($this->getZeroAmplitude(), $this->getBitsPerSample()), $numSamples * $numChannels);
+ if ($duration >= 0) {
+ $this->_samples .= $data;
+ } else {
+ $this->_samples = $data . $this->_samples;
+ }
+
+ $this->setDataSize(); // implicit setSize(), setActualSize(), setNumBlocks()
+
+ return $this;
+ }
+
+ /**
+ * Degrade the quality of the wav file by introducing random noise.
+ *
+ * @param float quality (Optional) The quality relative to the amplitude. 1 = no noise, 0 = max. noise.
+ */
+ public function degrade($quality = 1.0)
+ {
+ return $this->filter(array(
+ self::FILTER_DEGRADE => $quality
+ ));
+ }
+
+ /**
+ * Generate noise at the end of the wav for the specified duration and volume.
+ *
+ * @param float $duration (Optional) Number of seconds of noise to generate.
+ * @param float $percent (Optional) The percentage of the maximum amplitude to use. 100 = full amplitude.
+ */
+ public function generateNoise($duration = 1.0, $percent = 100)
+ {
+ $numChannels = $this->getNumChannels();
+ $numSamples = $this->getSampleRate() * $duration;
+ $minAmp = $this->getMinAmplitude();
+ $maxAmp = $this->getMaxAmplitude();
+ $bitDepth = $this->getBitsPerSample();
+
+ for ($s = 0; $s < $numSamples; ++$s) {
+ if ($bitDepth == 32) {
+ $val = rand(-$percent * 10000, $percent * 10000) / 1000000;
+ } else {
+ $val = rand($minAmp, $maxAmp);
+ $val = (int)($val * $percent / 100);
+ }
+
+ $this->_samples .= str_repeat(self::packSample($val, $bitDepth), $numChannels);
+ }
+
+ $this->setDataSize(); // implicit setSize(), setActualSize(), setNumBlocks()
+
+ return $this;
+ }
+
+ /**
+ * Convert sample data to different bits per sample.
+ *
+ * @param int $bitsPerSample (Required) The new number of bits per sample;
+ * @throws WavFileException
+ */
+ public function convertBitsPerSample($bitsPerSample) {
+ if ($this->getBitsPerSample() == $bitsPerSample) {
+ return $this;
+ }
+
+ $tempWav = new WavFile($this->getNumChannels(), $this->getSampleRate(), $bitsPerSample);
+ $tempWav->filter(
+ array(self::FILTER_MIX => $this),
+ 0,
+ $this->getNumBlocks()
+ );
+
+ $this->setSamples() // implicit setDataSize(), setSize(), setActualSize(), setNumBlocks()
+ ->setBitsPerSample($bitsPerSample); // implicit setValidBitsPerSample(), setAudioFormat(), setAudioSubFormat(), setFmtChunkSize(), setFactChunkSize(), setSize(), setActualSize(), setDataOffset(), setByteRate(), setBlockAlign(), setNumBlocks()
+ $this->_samples = $tempWav->_samples;
+ $this->setDataSize(); // implicit setSize(), setActualSize(), setNumBlocks()
+
+ return $this;
+ }
+
+
+ /*%******************************************************************************************%*/
+ // Miscellaneous methods
+
+ /**
+ * Output information about the wav object.
+ */
+ public function displayInfo()
+ {
+ $s = "File Size: %u\n"
+ ."Chunk Size: %u\n"
+ ."fmt Subchunk Size: %u\n"
+ ."Extended fmt Size: %u\n"
+ ."fact Subchunk Size: %u\n"
+ ."Data Offset: %u\n"
+ ."Data Size: %u\n"
+ ."Audio Format: %s\n"
+ ."Audio SubFormat: %s\n"
+ ."Channels: %u\n"
+ ."Channel Mask: 0x%s\n"
+ ."Sample Rate: %u\n"
+ ."Bits Per Sample: %u\n"
+ ."Valid Bits Per Sample: %u\n"
+ ."Sample Block Size: %u\n"
+ ."Number of Sample Blocks: %u\n"
+ ."Byte Rate: %uBps\n";
+
+ $s = sprintf($s, $this->getActualSize(),
+ $this->getChunkSize(),
+ $this->getFmtChunkSize(),
+ $this->getFmtExtendedSize(),
+ $this->getFactChunkSize(),
+ $this->getDataOffset(),
+ $this->getDataSize(),
+ $this->getAudioFormat() == self::WAVE_FORMAT_PCM ? 'PCM' : ($this->getAudioFormat() == self::WAVE_FORMAT_IEEE_FLOAT ? 'IEEE FLOAT' : 'EXTENSIBLE'),
+ $this->getAudioSubFormat() == self::WAVE_SUBFORMAT_PCM ? 'PCM' : 'IEEE FLOAT',
+ $this->getNumChannels(),
+ dechex($this->getChannelMask()),
+ $this->getSampleRate(),
+ $this->getBitsPerSample(),
+ $this->getValidBitsPerSample(),
+ $this->getBlockAlign(),
+ $this->getNumBlocks(),
+ $this->getByteRate());
+
+ if (php_sapi_name() == 'cli') {
+ return $s;
+ } else {
+ return nl2br($s);
+ }
+ }
+}
+
+
+/*%******************************************************************************************%*/
+// Exceptions
+
+/**
+ * WavFileException indicates an illegal state or argument in this class.
+ */
+class WavFileException extends Exception {}
+
+/**
+ * WavFormatException indicates a malformed or unsupported wav file header.
+ */
+class WavFormatException extends WavFileException {}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-19 00:38:21 +0000