ILIAS  Release_5_0_x_branch Revision 61816
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Public Member Functions | Static Public Member Functions | Data Fields | Protected Member Functions | Protected Attributes | Static Protected Attributes
WavFile Class Reference
+ Collaboration diagram for WavFile:

Public Member Functions

 __construct ($numChannelsOrFileName=null, $sampleRateOrReadData=null, $bitsPerSample=null)
 WavFile Constructor.
 __destruct ()
 __clone ()
 __toString ()
 Output the wav file headers and data.
 getActualSize ()
 getChunkSize ()
 getFmtChunkSize ()
 getFmtExtendedSize ()
 getFactChunkSize ()
 getDataSize ()
 getDataOffset ()
 getAudioFormat ()
 getAudioSubFormat ()
 getNumChannels ()
 setNumChannels ($numChannels)
 getChannelMask ()
 setChannelMask ($channelMask=self::SPEAKER_DEFAULT)
 getSampleRate ()
 setSampleRate ($sampleRate)
 getBitsPerSample ()
 setBitsPerSample ($bitsPerSample)
 getValidBitsPerSample ()
 getBlockAlign ()
 getNumBlocks ()
 getByteRate ()
 getSamples ()
 setSamples (&$samples= '')
 getMinAmplitude ()
 getZeroAmplitude ()
 getMaxAmplitude ()
 makeHeader ()
 Construct a wav header from this object.
 getDataSubchunk ()
 Construct wav DATA chunk.
 save ($filename)
 Save the wav data to a file.
 openWav ($filename, $readData=true)
 Reads a wav header and data from a file.
 closeWav ()
 Close a with openWav() previously opened wav file or free the buffer of setWavData().
 setWavData (&$data, $free=true)
 Set the wav file data and properties from a wav file in a string.
 readWavData ($dataOffset=0, $dataSize=null)
 Read the wav data from the file into the buffer.
 getSampleBlock ($blockNum)
 Return a single sample block from the file.
 setSampleBlock ($sampleBlock, $blockNum)
 Set a single sample block.
 getSampleValue ($blockNum, $channelNum)
 Get a float sample value for a specific sample block and channel number.
 setSampleValue ($sampleFloat, $blockNum, $channelNum)
 Sets a float sample value for a specific sample block number and channel.
 filter ($filters, $blockOffset=0, $numBlocks=null)
 Run samples through audio processing filters.
 appendWav (WavFile $wav)
 Append a wav file to the current wav.
 mergeWav (WavFile $wav, $normalizeThreshold=null)
 Mix 2 wav files together.
 insertSilence ($duration=1.0)
 Add silence to the wav file.
 degrade ($quality=1.0)
 Degrade the quality of the wav file by introducing random noise.
 generateNoise ($duration=1.0, $percent=100)
 Generate noise at the end of the wav for the specified duration and volume.
 convertBitsPerSample ($bitsPerSample)
 Convert sample data to different bits per sample.
 displayInfo ()
 Output information about the wav object.

Static Public Member Functions

static unpackSample ($sampleBinary, $bitDepth=null)
 Unpacks a single binary sample to numeric value.
static packSample ($sample, $bitDepth)
 Packs a single numeric sample to binary.
static unpackSampleBlock ($sampleBlock, $bitDepth, $numChannels=null)
 Unpacks a binary sample block to numeric values.
static packSampleBlock ($samples, $bitDepth)
 Packs an array of numeric channel samples to a binary sample block.
static normalizeSample ($sampleFloat, $threshold)
 Normalizes a float audio sample.

Data Fields

const FILTER_MIX = 0x01
const FILTER_NORMALIZE = 0x02
const FILTER_DEGRADE = 0x04
const MAX_CHANNEL = 18
const MAX_SAMPLERATE = 192000
const SPEAKER_DEFAULT = 0x000000
 Channel Locations for ChannelMask.
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
const WAVE_FORMAT_PCM = 0x0001
const WAVE_FORMAT_IEEE_FLOAT = 0x0003
const WAVE_FORMAT_EXTENSIBLE = 0xFFFE
const WAVE_SUBFORMAT_PCM = "0100000000001000800000aa00389b71"
const WAVE_SUBFORMAT_IEEE_FLOAT = "0300000000001000800000aa00389b71"

Protected Member Functions

 setActualSize ($actualSize=null)
 setChunkSize ($chunkSize=null)
 setFmtChunkSize ($fmtChunkSize=null)
 setFmtExtendedSize ($fmtExtendedSize=null)
 setFactChunkSize ($factChunkSize=null)
 setDataSize ($dataSize=null)
 setDataOffset ($dataOffset=null)
 setAudioFormat ($audioFormat=null)
 setAudioSubFormat ($audioSubFormat=null)
 setValidBitsPerSample ($validBitsPerSample=null)
 setBlockAlign ($blockAlign=null)
 setNumBlocks ($numBlocks=null)
 setByteRate ($byteRate=null)
 readWav ($readData=true)
 Read wav file from a stream.
 readWavHeader ()
 Parse a wav header.

Protected Attributes

 $_actualSize
 $_chunkSize
 $_fmtChunkSize
 $_fmtExtendedSize
 $_factChunkSize
 $_dataSize
 $_dataSize_fp
 $_dataSize_valid
 $_dataOffset
 $_audioFormat
 $_audioSubFormat
 $_numChannels
 $_channelMask
 $_sampleRate
 $_bitsPerSample
 $_validBitsPerSample
 $_blockAlign
 $_numBlocks
 $_byteRate
 $_samples
 $_fp

Static Protected Attributes

static $LOOKUP_LOGBASE

Detailed Description

Definition at line 69 of file WavFile.php.

Constructor & Destructor Documentation

WavFile::__construct (   $numChannelsOrFileName = null,
  $sampleRateOrReadData = null,
  $bitsPerSample = null 
)

WavFile Constructor.

$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

Parameters
string | int$numChannelsOrFileName(Optional) If string, the filename of the wav file to open. The number of channels otherwise. Defaults to 1.
int | bool$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.
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.
Exceptions
WavFormatException
WavFileException

Definition at line 221 of file WavFile.php.

References openWav(), setNumChannels(), SPEAKER_DEFAULT, and WAVE_FORMAT_PCM.

{
$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->_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);
}
}

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WavFile::__destruct ( )

Definition at line 256 of file WavFile.php.

References closeWav().

{
if (is_resource($this->_fp)) $this->closeWav();
}

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Member Function Documentation

WavFile::__clone ( )

Definition at line 260 of file WavFile.php.

{
$this->_fp = null;
}
WavFile::__toString ( )

Output the wav file headers and data.

Returns
string The encoded file.

Definition at line 269 of file WavFile.php.

References getDataSubchunk(), and makeHeader().

{
return $this->makeHeader() .
$this->getDataSubchunk();
}

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WavFile::appendWav ( WavFile  $wav)

Append a wav file to the current wav.


The wav files must have the same sample rate, number of bits per sample, and number of channels.

Parameters
WavFile$wav(Required) The wav file to append.
Exceptions
WavFileException

Definition at line 1678 of file WavFile.php.

References getBitsPerSample(), getNumChannels(), getSampleRate(), and setDataSize().

{
// 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;
}

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WavFile::closeWav ( )

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.

Definition at line 953 of file WavFile.php.

Referenced by __destruct(), openWav(), readWav(), readWavData(), and setWavData().

{
if (is_resource($this->_fp)) fclose($this->_fp);
return $this;
}

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WavFile::convertBitsPerSample (   $bitsPerSample)

Convert sample data to different bits per sample.

Parameters
int$bitsPerSample(Required) The new number of bits per sample;
Exceptions
WavFileException

Definition at line 1779 of file WavFile.php.

References getBitsPerSample(), getNumBlocks(), getNumChannels(), getSampleRate(), setDataSize(), and setSamples().

{
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;
}

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WavFile::degrade (   $quality = 1.0)

Degrade the quality of the wav file by introducing random noise.

Parameters
floatquality (Optional) The quality relative to the amplitude. 1 = no noise, 0 = max. noise.

Definition at line 1736 of file WavFile.php.

References filter(), and FILTER_DEGRADE.

{
return $this->filter(self::FILTER_DEGRADE, array(
WavFile::FILTER_DEGRADE => $quality
));
}

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WavFile::displayInfo ( )

Output information about the wav object.

Definition at line 1806 of file WavFile.php.

References getActualSize(), getAudioFormat(), getAudioSubFormat(), getBitsPerSample(), getBlockAlign(), getByteRate(), getChannelMask(), getChunkSize(), getDataOffset(), getDataSize(), getFactChunkSize(), getFmtChunkSize(), getFmtExtendedSize(), getNumBlocks(), getNumChannels(), getSampleRate(), and getValidBitsPerSample().

{
$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);
}
}

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WavFile::filter (   $filters,
  $blockOffset = 0,
  $numBlocks = null 
)

Run samples through audio processing filters.

$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. ), 0, // (Optional) The block number of this WavFile to start with. null // (Optional) The number of blocks to process. );

Parameters
array$filters(Required) An array of 1 or more audio processing filters.
int$blockOffset(Optional) The block number to start precessing from.
int$numBlocks(Optional) The maximum number of blocks to process.
Exceptions
WavFileException

Definition at line 1571 of file WavFile.php.

References FILTER_DEGRADE, FILTER_MIX, FILTER_NORMALIZE, getNumBlocks(), getNumChannels(), getSampleRate(), getSampleValue(), normalizeSample(), and setSampleValue().

Referenced by degrade(), and mergeWav().

{
// 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) $filter_degrade = true;
}
// loop through all sample blocks
for ($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;
}
// write current sample
$this->setSampleValue($sampleFloat, $currentBlock, $channel);
}
}
return $this;
}

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WavFile::generateNoise (   $duration = 1.0,
  $percent = 100 
)

Generate noise at the end of the wav for the specified duration and volume.

Parameters
float$duration(Optional) Number of seconds of noise to generate.
float$percent(Optional) The percentage of the maximum amplitude to use. 100 = full amplitude.

Definition at line 1749 of file WavFile.php.

References getBitsPerSample(), getMaxAmplitude(), getMinAmplitude(), getNumChannels(), getSampleRate(), and setDataSize().

{
$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;
}

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WavFile::getActualSize ( )

Definition at line 453 of file WavFile.php.

References $_actualSize.

Referenced by displayInfo().

{
return $this->_actualSize;
}

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WavFile::getAudioFormat ( )

Definition at line 583 of file WavFile.php.

References $_audioFormat.

Referenced by displayInfo(), and makeHeader().

{
return $this->_audioFormat;
}

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WavFile::getAudioSubFormat ( )

Definition at line 612 of file WavFile.php.

References $_audioSubFormat.

Referenced by displayInfo(), and makeHeader().

{
return $this->_audioSubFormat;
}

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WavFile::getBitsPerSample ( )

Definition at line 693 of file WavFile.php.

References $_bitsPerSample.

Referenced by appendWav(), convertBitsPerSample(), displayInfo(), generateNoise(), insertSilence(), and makeHeader().

{
return $this->_bitsPerSample;
}

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WavFile::getBlockAlign ( )

Definition at line 732 of file WavFile.php.

References $_blockAlign.

Referenced by displayInfo(), makeHeader(), and readWavData().

{
return $this->_blockAlign;
}

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WavFile::getByteRate ( )

Definition at line 763 of file WavFile.php.

References $_byteRate.

Referenced by displayInfo(), and makeHeader().

{
return $this->_byteRate;
}

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WavFile::getChannelMask ( )

Definition at line 650 of file WavFile.php.

References $_channelMask.

Referenced by displayInfo(), and makeHeader().

{
return $this->_channelMask;
}

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WavFile::getChunkSize ( )

Definition at line 467 of file WavFile.php.

References $_chunkSize.

Referenced by displayInfo(), and makeHeader().

{
return $this->_chunkSize;
}

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WavFile::getDataOffset ( )

Definition at line 565 of file WavFile.php.

References $_dataOffset.

Referenced by displayInfo().

{
return $this->_dataOffset;
}

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WavFile::getDataSize ( )

Definition at line 547 of file WavFile.php.

References $_dataSize.

Referenced by displayInfo(), and getDataSubchunk().

{
return $this->_dataSize;
}

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WavFile::getDataSubchunk ( )

Construct wav DATA chunk.

Returns
string The DATA header and chunk.

Definition at line 884 of file WavFile.php.

References getDataSize(), and setDataSize().

Referenced by __toString(), and save().

{
// 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
}

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WavFile::getFactChunkSize ( )

Definition at line 526 of file WavFile.php.

References $_factChunkSize.

Referenced by displayInfo(), and makeHeader().

{
return $this->_factChunkSize;
}

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WavFile::getFmtChunkSize ( )

Definition at line 487 of file WavFile.php.

References $_fmtChunkSize.

Referenced by displayInfo(), and makeHeader().

{
return $this->_fmtChunkSize;
}

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WavFile::getFmtExtendedSize ( )

Definition at line 504 of file WavFile.php.

References $_fmtExtendedSize.

Referenced by displayInfo(), and makeHeader().

{
return $this->_fmtExtendedSize;
}

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WavFile::getMaxAmplitude ( )

Definition at line 819 of file WavFile.php.

Referenced by generateNoise().

{
if($this->_bitsPerSample == 8) {
return 0xFF;
} elseif($this->_bitsPerSample == 32) {
return 1.0;
} else {
return (1 << ($this->_bitsPerSample - 1)) - 1;
}
}

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WavFile::getMinAmplitude ( )

Definition at line 797 of file WavFile.php.

Referenced by generateNoise().

{
if ($this->_bitsPerSample == 8) {
return 0;
} elseif ($this->_bitsPerSample == 32) {
return -1.0;
} else {
return -(1 << ($this->_bitsPerSample - 1));
}
}

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WavFile::getNumBlocks ( )

Definition at line 748 of file WavFile.php.

References $_numBlocks.

Referenced by convertBitsPerSample(), displayInfo(), filter(), and makeHeader().

{
return $this->_numBlocks;
}

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WavFile::getNumChannels ( )

Definition at line 630 of file WavFile.php.

References $_numChannels.

Referenced by appendWav(), convertBitsPerSample(), displayInfo(), filter(), generateNoise(), insertSilence(), and makeHeader().

{
return $this->_numChannels;
}

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WavFile::getSampleBlock (   $blockNum)

Return a single sample block from the file.

Parameters
int$blockNum(Required) The sample block number. Zero based.
Returns
string The binary sample block (all channels). Returns null if the sample block number was out of range.

Definition at line 1319 of file WavFile.php.

References $_blockAlign, and setDataSize().

{
// 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);
}

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WavFile::getSampleRate ( )

Definition at line 675 of file WavFile.php.

References $_sampleRate.

Referenced by appendWav(), convertBitsPerSample(), displayInfo(), filter(), generateNoise(), insertSilence(), and makeHeader().

{
return $this->_sampleRate;
}

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WavFile::getSamples ( )

Definition at line 777 of file WavFile.php.

References $_samples.

{
return $this->_samples;
}
WavFile::getSampleValue (   $blockNum,
  $channelNum 
)

Get a float sample value for a specific sample block and channel number.

Parameters
int$blockNum(Required) The sample block number to fetch. Zero based.
int$channelNum(Required) The channel number within the sample block to fetch. First channel is 1.
Returns
float The float sample value. Returns null if the sample block number was out of range.
Exceptions
WavFileException

Definition at line 1389 of file WavFile.php.

References setDataSize().

Referenced by filter().

{
// 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;
}
}

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WavFile::getValidBitsPerSample ( )

Definition at line 713 of file WavFile.php.

References $_validBitsPerSample.

Referenced by displayInfo(), and makeHeader().

{
return $this->_validBitsPerSample;
}

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WavFile::getZeroAmplitude ( )

Definition at line 808 of file WavFile.php.

Referenced by insertSilence().

{
if ($this->_bitsPerSample == 8) {
return 0x80;
} elseif ($this->_bitsPerSample == 32) {
return 0.0;
} else {
return 0;
}
}

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WavFile::insertSilence (   $duration = 1.0)

Add silence to the wav file.

Parameters
float$duration(Optional) How many seconds of silence. If negative, add to the beginning of the file. Defaults to 1s.

Definition at line 1714 of file WavFile.php.

References $_samples, getBitsPerSample(), getNumChannels(), getSampleRate(), getZeroAmplitude(), and setDataSize().

{
$numSamples = (int)($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;
}

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WavFile::makeHeader ( )

Construct a wav header from this object.

Includes "fact" chunk in necessary. http://www-mmsp.ece.mcgill.ca/documents/audioformats/wave/wave.html

Returns
string The RIFF header data.

Definition at line 840 of file WavFile.php.

References getAudioFormat(), getAudioSubFormat(), getBitsPerSample(), getBlockAlign(), getByteRate(), getChannelMask(), getChunkSize(), getFactChunkSize(), getFmtChunkSize(), getFmtExtendedSize(), getNumBlocks(), getNumChannels(), getSampleRate(), getValidBitsPerSample(), setAudioFormat(), and setNumBlocks().

Referenced by __toString(), and save().

{
// 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;
}

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WavFile::mergeWav ( WavFile  $wav,
  $normalizeThreshold = null 
)

Mix 2 wav files together.


Both wavs must have the same sample rate and same number of channels.

Parameters
WavFile$wav(Required) The WavFile to mix.
float$normalizeThreshold(Optional) See normalizeSample for an explanation.
Exceptions
WavFileException

Definition at line 1702 of file WavFile.php.

References filter(), FILTER_MIX, and FILTER_NORMALIZE.

{
return $this->filter(array(
WavFile::FILTER_MIX => $wav,
WavFile::FILTER_NORMALIZE => $normalizeThreshold
));
}

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static WavFile::normalizeSample (   $sampleFloat,
  $threshold 
)
static

Normalizes a float audio sample.

Maximum input range assumed for compression is [-2, 2]. See http://www.voegler.eu/pub/audio/ for more information.

Parameters
float$sampleFloat(Required) The float sample to normalize.
float$threshold(Required) The threshold or gain factor for normalizing the amplitude.
  • >= 1 - Normalize by multiplying by the threshold (boost - positive gain).
    A value of 1 in effect means no normalization (and results in clipping).
  • <= -1 - Normalize by dividing by the the absolute value of threshold (attenuate - negative gain).
    A factor of 2 (-2) is about 6dB reduction in volume.
  • [0, 1) - (open inverval - not including 1) - The threshold above which amplitudes are comressed logarithmically.
    e.g. 0.6 to leave amplitudes up to 60% "as is" and compress above.
  • (-1, 0) - (open inverval - not including -1 and 0) - The threshold above which amplitudes are comressed linearly.
    e.g. -0.6 to leave amplitudes up to 60% "as is" and compress above.
Returns
float The normalized sample.

Definition at line 419 of file WavFile.php.

Referenced by filter().

{
// 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;
}

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WavFile::openWav (   $filename,
  $readData = true 
)

Reads a wav header and data from a file.

Parameters
string$filename(Required) The path to the wav file to read.
bool$readData(Optional) If true, also read the data chunk.
Exceptions
WavFormatException
WavFileException

Definition at line 927 of file WavFile.php.

References $filename, closeWav(), and readWav().

Referenced by __construct().

{
// 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);
}

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static WavFile::packSample (   $sample,
  $bitDepth 
)
static

Packs a single numeric sample to binary.

Parameters
int | float$sample(Required) The sample to encode. Has to be within valid range for $bitDepth. Float values only for 32 bits.
int$bitDepth(Required) The bits per sample to encode with.
Returns
string The encoded binary sample. Returns null for unsupported bit depths.

Definition at line 332 of file WavFile.php.

Referenced by packSampleBlock().

{
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;
}
}

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static WavFile::packSampleBlock (   $samples,
  $bitDepth 
)
static

Packs an array of numeric channel samples to a binary sample block.

Parameters
array$samples(Required) The array of channel sample values. Expects float values for 32 bits and integer otherwise.
int$bitDepth(Required) The bits per sample to encode with.
Returns
string The encoded binary sample block.

Definition at line 392 of file WavFile.php.

References packSample().

{
$sampleBlock = '';
foreach($samples as $sample) {
$sampleBlock .= self::packSample($sample, $bitDepth);
}
return $sampleBlock;
}

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WavFile::readWav (   $readData = true)
protected

Read wav file from a stream.

Parameters
$readData(Optional) If true, also read the data chunk.
Exceptions
WavFormatException
WavFileException

Definition at line 997 of file WavFile.php.

References closeWav(), readWavData(), and readWavHeader().

Referenced by openWav(), and setWavData().

{
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;
}

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WavFile::readWavData (   $dataOffset = 0,
  $dataSize = null 
)

Read the wav data from the file into the buffer.

Parameters
$dataOffset(Optional) The byte offset to skip before starting to read. Must be a multiple of BlockAlign.
$dataSize(Optional) The size of the data to read in bytes. Must be a multiple of BlockAlign. Defaults to all data.
Exceptions
WavFileException

Definition at line 1278 of file WavFile.php.

References closeWav(), getBlockAlign(), and setDataSize().

Referenced by readWav().

{
// 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();
}

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WavFile::readWavHeader ( )
protected

Parse a wav header.

http://www-mmsp.ece.mcgill.ca/documents/audioformats/wave/wave.html

Exceptions
WavFormatException
WavFileException

Definition at line 1022 of file WavFile.php.

References $n.

Referenced by readWav().

{
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 ($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;
//throw new WavFormatException('"RIFF" chunk size does not match actual file size. Found ' . $RIFF['ChunkSize'] . ', expected ' . ($actualSize - 8) . '.', 3);
}
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;
//throw new WavFormatException('Invalid block align in "fmt " subchunk. Found ' . $fmt['BlockAlign'] . ', expected ' . $blockAlign . '.', 17);
}
$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;
//throw new WavFormatException('Invalid average byte rate in "fmt " subchunk. Found ' . $fmt['ByteRate'] . ', expected ' . $byteRate . '.', 18);
}
$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);
$extensibleFmt['Size'] = 22;
//throw new WavFormatException('Invaid extension size in EXTENSIBLE "fmt " subchunk.', 20);
}
if ($extensibleFmt['ValidBitsPerSample'] != $fmt['BitsPerSample']) {
trigger_error('Invaid or unsupported valid bits per sample in EXTENSIBLE "fmt " subchunk.', E_USER_NOTICE);
$extensibleFmt['ValidBitsPerSample'] = $fmt['BitsPerSample'];
//throw new WavFormatException('Invaid or unsupported valid bits per sample in EXTENSIBLE "fmt " subchunk.', 21);
}
if ($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;
//throw new WavFormatException('Invalid channel mask in EXTENSIBLE "fmt " subchunk. The number of channels does not match the number of locations in the mask.', 22);
}
}
$this->_fmtExtendedSize = strlen($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 ($dataSubchunk['SubchunkSize'] < 0 || $actualSize - $dataOffset < $dataSubchunk['SubchunkSize']) {
trigger_error('Invalid "data" subchunk size.', E_USER_NOTICE);
$dataSubchunk['SubchunkSize'] = $actualSize - $dataOffset;
//throw new WavFormatException('Invalid "data" subchunk size.', 104);
}
$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;
//throw new WavFormatException('Invalid sample length in "fact" subchunk.', 105);
}
$this->_factChunkSize = $factSubchunk['SubchunkSize'];
$this->_numBlocks = $factSubchunk['SampleLength'];
return $this;
}

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WavFile::save (   $filename)

Save the wav data to a file.

Parameters
string$filename(Required) The file path to save the wav to.
Exceptions
WavFileException

Definition at line 905 of file WavFile.php.

References $filename, getDataSubchunk(), and makeHeader().

{
$fp = @fopen($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;
}

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WavFile::setActualSize (   $actualSize = null)
protected

Definition at line 457 of file WavFile.php.

References $_chunkSize.

Referenced by setChunkSize().

{
if (is_null($actualSize)) {
$this->_actualSize = 8 + $this->_chunkSize; // + "RIFF" header (ID + size)
} else {
$this->_actualSize = $actualSize;
}
return $this;
}

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WavFile::setAudioFormat (   $audioFormat = null)
protected

Definition at line 587 of file WavFile.php.

References setAudioSubFormat(), WAVE_FORMAT_EXTENSIBLE, WAVE_FORMAT_IEEE_FLOAT, and WAVE_FORMAT_PCM.

Referenced by makeHeader(), setChannelMask(), setNumChannels(), and setValidBitsPerSample().

{
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;
}

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WavFile::setAudioSubFormat (   $audioSubFormat = null)
protected

Definition at line 616 of file WavFile.php.

References WAVE_SUBFORMAT_IEEE_FLOAT, and WAVE_SUBFORMAT_PCM.

Referenced by setAudioFormat().

{
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;
}

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WavFile::setBitsPerSample (   $bitsPerSample)

Definition at line 697 of file WavFile.php.

References setValidBitsPerSample().

{
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;
}

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WavFile::setBlockAlign (   $blockAlign = null)
protected

Definition at line 736 of file WavFile.php.

References setNumBlocks().

{
if (is_null($blockAlign)) {
$this->_blockAlign = $this->_numChannels * $this->_bitsPerSample / 8;
} else {
$this->_blockAlign = $blockAlign;
}
$this->setNumBlocks();
return $this;
}

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WavFile::setByteRate (   $byteRate = null)
protected

Definition at line 767 of file WavFile.php.

Referenced by setSampleRate().

{
if (is_null($byteRate)) {
$this->_byteRate = $this->_sampleRate * $this->_numChannels * $this->_bitsPerSample / 8;
} else {
$this->_byteRate = $byteRate;
}
return $this;
}

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WavFile::setChannelMask (   $channelMask = self::SPEAKER_DEFAULT)

Definition at line 654 of file WavFile.php.

References $n, and setAudioFormat().

{
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;
}

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WavFile::setChunkSize (   $chunkSize = null)
protected

Definition at line 471 of file WavFile.php.

References setActualSize().

Referenced by setDataSize(), setFactChunkSize(), and setFmtChunkSize().

{
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;
}

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WavFile::setDataOffset (   $dataOffset = null)
protected

Definition at line 569 of file WavFile.php.

{
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;
}
WavFile::setDataSize (   $dataSize = null)
protected

Definition at line 551 of file WavFile.php.

References setChunkSize().

Referenced by appendWav(), convertBitsPerSample(), generateNoise(), getDataSubchunk(), getSampleBlock(), getSampleValue(), insertSilence(), readWavData(), setSampleBlock(), setSamples(), and setSampleValue().

{
if (is_null($dataSize)) {
$this->_dataSize = strlen($this->_samples);
} else {
$this->_dataSize = $dataSize;
}
$this->setChunkSize() // implicit setActualSize()
->setNumBlocks();
$this->_dataSize_valid = true;
return $this;
}

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WavFile::setFactChunkSize (   $factChunkSize = null)
protected

Definition at line 530 of file WavFile.php.

References setChunkSize().

{
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;
}

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WavFile::setFmtChunkSize (   $fmtChunkSize = null)
protected

Definition at line 491 of file WavFile.php.

References $_fmtExtendedSize, and setChunkSize().

Referenced by setFmtExtendedSize().

{
if (is_null($fmtChunkSize)) {
$this->_fmtChunkSize = 16 + $this->_fmtExtendedSize;
} else {
$this->_fmtChunkSize = $fmtChunkSize;
}
$this->setChunkSize() // implicit setActualSize()
->setDataOffset();
return $this;
}

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WavFile::setFmtExtendedSize (   $fmtExtendedSize = null)
protected

Definition at line 508 of file WavFile.php.

References setFmtChunkSize().

{
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;
}

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WavFile::setNumBlocks (   $numBlocks = null)
protected

Definition at line 753 of file WavFile.php.

Referenced by makeHeader(), and setBlockAlign().

{
if (is_null($numBlocks)) {
$this->_numBlocks = (int)($this->_dataSize / $this->_blockAlign); // do not count incomplete sample blocks
} else {
$this->_numBlocks = $numBlocks;
}
return $this;
}

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WavFile::setNumChannels (   $numChannels)

Definition at line 634 of file WavFile.php.

References setAudioFormat().

Referenced by __construct().

{
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;
}

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WavFile::setSampleBlock (   $sampleBlock,
  $blockNum 
)

Set a single sample block.


Allows to append a sample block.

Parameters
string$sampleBlock(Required) The binary sample block (all channels).
int$blockNum(Required) The sample block number. Zero based.
Exceptions
WavFileException

Definition at line 1344 of file WavFile.php.

References $_blockAlign, and setDataSize().

{
// 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;
}

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WavFile::setSampleRate (   $sampleRate)

Definition at line 679 of file WavFile.php.

References setByteRate().

{
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;
}

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WavFile::setSamples ( &  $samples = '')

Definition at line 781 of file WavFile.php.

References setDataSize().

Referenced by convertBitsPerSample().

{
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;
}

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WavFile::setSampleValue (   $sampleFloat,
  $blockNum,
  $channelNum 
)

Sets a float sample value for a specific sample block number and channel.


Converts float values to appropriate integer values and clips properly.
Allows to append samples (in order).

Parameters
float$sampleFloat(Required) The float sample value to set. Converts float values and clips if necessary.
int$blockNum(Required) The sample block number to set or append. Zero based.
int$channelNum(Required) The channel number within the sample block to set or append. First channel is 1.
Exceptions
WavFileException

Definition at line 1453 of file WavFile.php.

References $_bitsPerSample, $_dataSize, and setDataSize().

Referenced by filter().

{
// 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;
}

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WavFile::setValidBitsPerSample (   $validBitsPerSample = null)
protected

Definition at line 717 of file WavFile.php.

References $_bitsPerSample, and setAudioFormat().

Referenced by setBitsPerSample().

{
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;
}

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WavFile::setWavData ( &  $data,
  $free = true 
)

Set the wav file data and properties from a wav file in a string.

Parameters
string$data(Required) The wav file data. Passed by reference.
bool$free(Optional) True to free the passed $data after copying.
Exceptions
WavFormatException
WavFileException

Definition at line 967 of file WavFile.php.

References closeWav(), and readWav().

{
// 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);
}

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static WavFile::unpackSample (   $sampleBinary,
  $bitDepth = null 
)
static

Unpacks a single binary sample to numeric value.

Parameters
string$sampleBinary(Required) The sample to decode.
int$bitDepth(Optional) The bits per sample to decode. If omitted, derives it from the length of $sampleBinary.
Returns
int|float The numeric sample value. Float for 32-bit samples. Returns null for unsupported bit depths.

Definition at line 286 of file WavFile.php.

Referenced by unpackSampleBlock().

{
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;
}
}

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static WavFile::unpackSampleBlock (   $sampleBlock,
  $bitDepth,
  $numChannels = null 
)
static

Unpacks a binary sample block to numeric values.

Parameters
string$sampleBlock(Required) The binary sample block (all channels).
int$bitDepth(Required) The bits per sample to decode.
int$numChannels(Optional) The number of channels to decode. If omitted, derives it from the length of $sampleBlock and $bitDepth.
Returns
array The sample values as an array of integers of floats for 32 bits. First channel is array index 1.

Definition at line 370 of file WavFile.php.

References unpackSample().

{
$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;
}

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Field Documentation

WavFile::$_actualSize
protected

Definition at line 141 of file WavFile.php.

Referenced by getActualSize().

WavFile::$_audioFormat
protected

Definition at line 168 of file WavFile.php.

Referenced by getAudioFormat().

WavFile::$_audioSubFormat
protected

Definition at line 171 of file WavFile.php.

Referenced by getAudioSubFormat().

WavFile::$_bitsPerSample
protected

Definition at line 183 of file WavFile.php.

Referenced by getBitsPerSample(), setSampleValue(), and setValidBitsPerSample().

WavFile::$_blockAlign
protected

Definition at line 189 of file WavFile.php.

Referenced by getBlockAlign(), getSampleBlock(), and setSampleBlock().

WavFile::$_byteRate
protected

Definition at line 195 of file WavFile.php.

Referenced by getByteRate().

WavFile::$_channelMask
protected

Definition at line 177 of file WavFile.php.

Referenced by getChannelMask().

WavFile::$_chunkSize
protected

Definition at line 144 of file WavFile.php.

Referenced by getChunkSize(), and setActualSize().

WavFile::$_dataOffset
protected

Definition at line 165 of file WavFile.php.

Referenced by getDataOffset().

WavFile::$_dataSize
protected

Definition at line 156 of file WavFile.php.

Referenced by getDataSize(), and setSampleValue().

WavFile::$_dataSize_fp
protected

Definition at line 159 of file WavFile.php.

WavFile::$_dataSize_valid
protected

Definition at line 162 of file WavFile.php.

WavFile::$_factChunkSize
protected

Definition at line 153 of file WavFile.php.

Referenced by getFactChunkSize().

WavFile::$_fmtChunkSize
protected

Definition at line 147 of file WavFile.php.

Referenced by getFmtChunkSize().

WavFile::$_fmtExtendedSize
protected

Definition at line 150 of file WavFile.php.

Referenced by getFmtExtendedSize(), and setFmtChunkSize().

WavFile::$_fp
protected

Definition at line 201 of file WavFile.php.

WavFile::$_numBlocks
protected

Definition at line 192 of file WavFile.php.

Referenced by getNumBlocks().

WavFile::$_numChannels
protected

Definition at line 174 of file WavFile.php.

Referenced by getNumChannels().

WavFile::$_sampleRate
protected

Definition at line 180 of file WavFile.php.

Referenced by getSampleRate().

WavFile::$_samples
protected

Definition at line 198 of file WavFile.php.

Referenced by getSamples(), and insertSilence().

WavFile::$_validBitsPerSample
protected

Definition at line 186 of file WavFile.php.

Referenced by getValidBitsPerSample().

WavFile::$LOOKUP_LOGBASE
staticprotected
Initial value:
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
)

Definition at line 133 of file WavFile.php.

const WavFile::FILTER_DEGRADE = 0x04

Definition at line 81 of file WavFile.php.

Referenced by degrade(), filter(), and Securimage\generateWAV().

const WavFile::FILTER_MIX = 0x01

Definition at line 75 of file WavFile.php.

Referenced by filter(), Securimage\generateWAV(), and mergeWav().

const WavFile::FILTER_NORMALIZE = 0x02

Definition at line 78 of file WavFile.php.

Referenced by filter(), Securimage\generateWAV(), and mergeWav().

const WavFile::MAX_CHANNEL = 18

Definition at line 84 of file WavFile.php.

const WavFile::MAX_SAMPLERATE = 192000

Definition at line 87 of file WavFile.php.

const WavFile::SPEAKER_ALL = 0x03FFFF

Definition at line 109 of file WavFile.php.

const WavFile::SPEAKER_BACK_CENTER = 0x000100

Definition at line 99 of file WavFile.php.

const WavFile::SPEAKER_BACK_LEFT = 0x000010

Definition at line 95 of file WavFile.php.

const WavFile::SPEAKER_BACK_RIGHT = 0x000020

Definition at line 96 of file WavFile.php.

const WavFile::SPEAKER_DEFAULT = 0x000000

Channel Locations for ChannelMask.

Definition at line 90 of file WavFile.php.

Referenced by __construct().

const WavFile::SPEAKER_FRONT_CENTER = 0x000004

Definition at line 93 of file WavFile.php.

const WavFile::SPEAKER_FRONT_LEFT = 0x000001

Definition at line 91 of file WavFile.php.

const WavFile::SPEAKER_FRONT_LEFT_OF_CENTER = 0x000040

Definition at line 97 of file WavFile.php.

const WavFile::SPEAKER_FRONT_RIGHT = 0x000002

Definition at line 92 of file WavFile.php.

const WavFile::SPEAKER_FRONT_RIGHT_OF_CENTER = 0x000080

Definition at line 98 of file WavFile.php.

const WavFile::SPEAKER_LOW_FREQUENCY = 0x000008

Definition at line 94 of file WavFile.php.

const WavFile::SPEAKER_SIDE_LEFT = 0x000200

Definition at line 100 of file WavFile.php.

const WavFile::SPEAKER_SIDE_RIGHT = 0x000400

Definition at line 101 of file WavFile.php.

const WavFile::SPEAKER_TOP_BACK_CENTER = 0x010000

Definition at line 107 of file WavFile.php.

const WavFile::SPEAKER_TOP_BACK_LEFT = 0x008000

Definition at line 106 of file WavFile.php.

const WavFile::SPEAKER_TOP_BACK_RIGHT = 0x020000

Definition at line 108 of file WavFile.php.

const WavFile::SPEAKER_TOP_CENTER = 0x000800

Definition at line 102 of file WavFile.php.

const WavFile::SPEAKER_TOP_FRONT_CENTER = 0x002000

Definition at line 104 of file WavFile.php.

const WavFile::SPEAKER_TOP_FRONT_LEFT = 0x001000

Definition at line 103 of file WavFile.php.

const WavFile::SPEAKER_TOP_FRONT_RIGHT = 0x004000

Definition at line 105 of file WavFile.php.

const WavFile::WAVE_FORMAT_EXTENSIBLE = 0xFFFE

Definition at line 118 of file WavFile.php.

Referenced by setAudioFormat().

const WavFile::WAVE_FORMAT_IEEE_FLOAT = 0x0003

Definition at line 115 of file WavFile.php.

Referenced by setAudioFormat().

const WavFile::WAVE_FORMAT_PCM = 0x0001

Definition at line 112 of file WavFile.php.

Referenced by __construct(), and setAudioFormat().

const WavFile::WAVE_SUBFORMAT_IEEE_FLOAT = "0300000000001000800000aa00389b71"

Definition at line 124 of file WavFile.php.

Referenced by setAudioSubFormat().

const WavFile::WAVE_SUBFORMAT_PCM = "0100000000001000800000aa00389b71"

Definition at line 121 of file WavFile.php.

Referenced by setAudioSubFormat().

The documentation for this class was generated from the following file: