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<?php
/*
* This file is part of PHP-FFmpeg.
*
* (c) Alchemy <[email protected]>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace FFMpeg\Media;
use Alchemy\BinaryDriver\Exception\ExecutionFailureException;
use FFMpeg\Driver\FFMpegDriver;
use FFMpeg\Exception\InvalidArgumentException;
use FFMpeg\Exception\RuntimeException;
use FFMpeg\FFProbe;
use FFMpeg\Filters\Waveform\WaveformFilterInterface;
use FFMpeg\Filters\Waveform\WaveformFilters;
/**
* Class Spectrum
* Generates an audio spectrum image using FFMPeg's `showspectrumpic` command
* @see https://ffmpeg.org/ffmpeg-filters.html#showspectrumpic
* @author Marcus Bointon <[email protected]>
* @package FFMpeg\Media
*/
class Spectrum extends Waveform
{
const DEFAULT_MODE = 'combined';
const DEFAULT_COLOR = 'intensity';
const DEFAULT_SCALE = 'log';
const DEFAULT_FSCALE = 'lin';
const DEFAULT_SATURATION = 1.0;
const DEFAULT_WIN_FUNC = 'hann';
const DEFAULT_ORIENTATION = 'vertical';
const DEFAULT_GAIN = 1.0;
const DEFAULT_LEGEND = true;
const DEFAULT_ROTATION = 0.0;
const DEFAULT_START = 0;
const DEFAULT_STOP = 0;
/**
* Whether to generate a `combined` spectrogram for all channels, or a `separate` one for each
* @var string
*/
protected $mode = self::DEFAULT_MODE;
/**
* The color palette to use, see setColor() for options
* @var string
*/
protected $color = self::DEFAULT_COLOR;
/**
* The scale to use for color intensity
* @var string
*/
protected $scale = self::DEFAULT_SCALE;
/**
* The scale to use for the frequency axis
* @var string
*/
protected $fscale = self::DEFAULT_FSCALE;
/**
* A saturation scaling factor, between -10.0 and 10.0. Negative values invert the color palette
* @var float
*/
protected $saturation = self::DEFAULT_SATURATION;
/**
* The windowing function to use when calculating the spectrum. See setWinFunc() for options
* @var string
*/
protected $win_func = self::DEFAULT_WIN_FUNC;
/**
* Frequency axis orientation, `horizontal` or `vertical`
* @var string
*/
protected $orientation = self::DEFAULT_ORIENTATION;
/**
* Gain for calculating color values
* @var float
*/
protected $gain = self::DEFAULT_GAIN;
/**
* Whether to display axes and labels
* @var bool
*/
protected $legend = self::DEFAULT_LEGEND;
/**
* Rotation of colors within the palette, between -1.0 and 1.0
* @var float
*/
protected $rotation = self::DEFAULT_ROTATION;
/**
* Starting frequency for the spectrum in Hz. Must be positive and not greater than stop frequency
* @var int
*/
protected $start = self::DEFAULT_START;
/**
* Ending frequency for the spectrum in Hz. Must be positive and not less than start frequency
* @var int
*/
protected $stop = self::DEFAULT_STOP;
/**
* Spectrum constructor.
*
* @param Audio $audio
* @param FFMpegDriver $driver
* @param FFProbe $ffprobe
* @param int $width
* @param int $height
* @param array $colors Note that this is not used, just here for compatibility with the Waveform parent
*/
public function __construct(
Audio $audio,
FFMpegDriver $driver,
FFProbe $ffprobe,
$width,
$height,
$colors = array(self::DEFAULT_COLOR)
) {
parent::__construct($audio, $driver, $ffprobe, $width, $height);
$this->audio = $audio;
}
/**
* Set the rendering mode.
*
* @param string $mode `combined` to create a single spectrogram for all channels, or `separate` for each channel separately, all within the same image
*
* @return $this
*/
public function setMode($mode = 'combined')
{
static $modes = array(
'combined',
'separate',
);
if (! in_array($mode, $modes, true)) {
throw new InvalidArgumentException('Unknown mode. Valid values are: ' . implode(', ', $modes));
}
$this->mode = $mode;
return $this;
}
/**
* Get the current rendering mode.
* @return string
*/
public function getMode()
{
return $this->mode;
}
/**
* Set the color palette to use.
*
* @param string $color One of the available preset palette names: `channel`, `intensity`, `moreland`, `nebulae`, `fire`, `fiery`, `fruit`, `cool`, `magma`, `green`, `viridis`, `plasma`, `cividis`, `terrain`, or `random` to have it pick a random one
*
* @return $this
*/
public function setColor($color = 'intensity')
{
static $modes = array(
'channel',
'intensity',
'moreland',
'nebulae',
'fire',
'fiery',
'fruit',
'cool',
'magma',
'green',
'viridis',
'plasma',
'cividis',
'terrain',
);
if ($color === 'random') {
$this->color = array_rand($modes);
return $this;
}
if (!in_array($color, $modes, true)) {
throw new InvalidArgumentException('Unknown color mode. Valid values are: ' . implode(', ', $modes));
}
$this->color = $color;
return $this;
}
/**
* Get the current color palette.
*
* @return string
*/
public function getColor()
{
return $this->color;
}
/**
* Set the scale to use for color intensity
*
* @param string $scale One of `lin`, `sqrt`, `log`, `4thrt`, or `5thrt`.
*
* @return $this
*/
public function setScale($scale = 'log')
{
static $scales = array(
'lin',
'sqrt',
'log',
'4thrt',
'5thrt',
);
if (! in_array($scale, $scales, true)) {
throw new InvalidArgumentException('Unknown scale. Valid values are: ' . implode(', ', $scales));
}
$this->scale = $scale;
return $this;
}
/**
* Get the current color intensity scale.
*
* @return string
*/
public function getScale()
{
return $this->scale;
}
/**
* Set the frequency axis scale.
*
* @param string $fscale One of `lin` or `log`.
*
* @return $this
*/
public function setFscale($fscale = 'lin')
{
static $fscales = array(
'lin',
'log',
);
if (! in_array($fscale, $fscales, true)) {
throw new InvalidArgumentException('Unknown fscale. Valid values are: ' . implode(', ', $fscales));
}
$this->fscale = $fscale;
return $this;
}
/**
* Get the current frequency axis scale.
*
* @return string
*/
public function getFscale()
{
return $this->fscale;
}
/**
* Set the color saturation scaling factor.
*
* @param float $saturation A value between -10.0 and 10.0 to multiply saturation values by. Negative values invert the saturation.
*
* @return $this
*/
public function setSaturation($saturation = 1.0)
{
$saturation = (float)$saturation;
if ($saturation < -10.0 || $saturation > 10.0) {
throw new InvalidArgumentException('Saturation must be between -10.0 and 10.0.');
}
$this->saturation = $saturation;
return $this;
}
/**
* Get the current saturation scaling value.
*
* @return float
*/
public function getSaturation()
{
return $this->saturation;
}
/**
* Set the windowing function to use when calculating the spectrum.
*
* @param string $win_func One of `rect`, `bartlett`, `hann`, `hanning`, `hamming`, `blackman`, `welch`, `flattop`, `bharris`, `bnuttall`, `bhann`, `sine`, `nuttall`, `lanczos`, `gauss`, `tukey`, `dolph`, `cauchy`, `parzen`, `poisson`, or `bohman`.
*
* @return $this
*/
public function setWinFunc($win_func = 'hann')
{
static $win_funcs = array(
'rect',
'bartlett',
'hann',
'hanning',
'hamming',
'blackman',
'welch',
'flattop',
'bharris',
'bnuttall',
'bhann',
'sine',
'nuttall',
'lanczos',
'gauss',
'tukey',
'dolph',
'cauchy',
'parzen',
'poisson',
'bohman',
);
if (! in_array($win_func, $win_funcs, true)) {
throw new InvalidArgumentException('Unknown win_func. Valid values are: ' . implode(', ', $win_funcs));
}
$this->win_func = $win_func;
return $this;
}
/**
* Get the current windowing function.
*
* @return string
*/
public function getWinFunc()
{
return $this->win_func;
}
/**
* Set the orientation of the generated spectrum.
*
* @param string $orientation `vertical` or `horizontal`
*
* @return $this
*/
public function setOrientation($orientation = 'vertical')
{
static $orientations = array(
'vertical',
'horizontal',
);
if (! in_array($orientation, $orientations, true)) {
throw new InvalidArgumentException(
'Unknown orientation. Valid values are: ' . implode(', ', $orientations)
);
}
$this->orientation = $orientation;
return $this;
}
/**
* Get the current orientation.
*
* @return string
*/
public function getOrientation()
{
return $this->orientation;
}
/**
* Set the gain used for calculating colour values.
*
* @param float $gain A multiplying factor: Use larger values for files with quieter audio.
*
* @return $this
*/
public function setGain($gain = 1.0)
{
$this->gain = (float)$gain;
return $this;
}
/**
* Get the current colour gain factor.
*
* @return float
*/
public function getGain()
{
return $this->gain;
}
/**
* Turn the graph legends (axes and scales) on and off.
*
* @param bool $legend
*
* @return $this
*/
public function setLegend($legend = true)
{
$this->legend = (bool)$legend;
return $this;
}
/**
* Get the current legend state.
*
* @return bool
*/
public function getLegend()
{
return $this->legend;
}
/**
* Set the color rotation value. This rotates the colour palette, not the resulting image.
*
* @param float $rotation
*
* @return $this
*/
public function setRotation($rotation = 0.0)
{
$rotation = (float)$rotation;
if ($rotation < -1.0 || $rotation > 1.0) {
throw new InvalidArgumentException('Color rotation must be between -1.0 and 1.0.');
}
$this->rotation = $rotation;
return $this;
}
/**
* Get the color palette rotation value.
*
* @return float
*/
public function getRotation()
{
return $this->rotation;
}
/**
* Set the starting frequency for the spectrum.
*
* @param int $start The starting frequency, in Hz. Must be positive and not greater than the stop frequency.
*
* @return $this
*/
public function setStart($start = 0)
{
$start = (int)abs($start);
if ($start > $this->stop) {
throw new InvalidArgumentException('Start frequency must be lower than stop frequency.');
}
$this->start = $start;
return $this;
}
/**
* Get the current starting frequency.
*
* @return int
*/
public function getStart()
{
return $this->start;
}
/**
* Set the ending frequency for the spectrum.
*
* @param int $stop The ending frequency, in Hz. Must be positive and not less than the start frequency.
*
* @return $this
*/
public function setStop($stop = 0)
{
$stop = (int)abs($stop);
if ($stop < $this->start) {
throw new InvalidArgumentException('Stop frequency must be higher than start frequency.');
}
$this->stop = $stop;
return $this;
}
/**
* Get the current ending frequency.
*
* @return int
*/
public function getStop()
{
return $this->stop;
}
/**
* Compile options into a parameter string
*
* @return string
*/
protected function compileOptions()
{
$params = array();
$params[] = 's=' . $this->width . 'x' . $this->height;
if ($this->mode !== self::DEFAULT_MODE) {
$params[] = 'mode=' . $this->mode;
}
if ($this->color !== self::DEFAULT_COLOR) {
$params[] = 'color=' . $this->color;
}
if ($this->scale !== self::DEFAULT_SCALE) {
$params[] = 'scale=' . $this->scale;
}
if ($this->fscale !== self::DEFAULT_FSCALE) {
$params[] = 'fscale=' . $this->fscale;
}
if ($this->saturation !== self::DEFAULT_SATURATION) {
$params[] = 'saturation=' . $this->saturation;
}
if ($this->win_func !== self::DEFAULT_WIN_FUNC) {
$params[] = 'win_func=' . $this->win_func;
}
if ($this->orientation !== self::DEFAULT_ORIENTATION) {
$params[] = 'orientation=' . $this->orientation;
}
if ($this->gain !== self::DEFAULT_GAIN) {
$params[] = 'gain=' . $this->gain;
}
if ($this->legend !== self::DEFAULT_LEGEND) {
$params[] = 'legend=' . ($this->legend ? '1' : '0');
}
if ($this->rotation !== self::DEFAULT_ROTATION) {
$params[] = 'rotation=' . $this->rotation;
}
if ($this->start !== self::DEFAULT_START) {
$params[] = 'start=' . $this->start;
}
if ($this->stop !== self::DEFAULT_STOP) {
$params[] = 'stop=' . $this->stop;
}
return implode(':', $params);
}
/**
* Generates and saves the spectrum in the given filename.
*
* @param string $pathfile
*
* @return Spectrum
*
* @throws RuntimeException
*/
public function save($pathfile)
{
/**
* might be optimized with http://ffmpeg.org/trac/ffmpeg/wiki/Seeking%20with%20FFmpeg
* @see http://ffmpeg.org/ffmpeg.html#Main-options
*/
$commands = array(
'-y', //Overwrite output files
'-i', //Specify input file
$this->pathfile,
'-filter_complex', //Say we want a complex filter
'showspectrumpic=' . $this->compileOptions(), //Specify the filter and its params
'-frames:v', //Stop writing output...
1 // after 1 "frame"
);
foreach ($this->filters as $filter) {
$commands = array_merge($commands, $filter->apply($this));
}
$commands = array_merge($commands, array($pathfile));
try {
$this->driver->command($commands);
} catch (ExecutionFailureException $e) {
$this->cleanupTemporaryFile($pathfile);
throw new RuntimeException('Unable to save spectrum', $e->getCode(), $e);
}
return $this;
}
}