SfInfo

Immutable signal properties describing an audio file — frame count, channel count, sample rate, container format, encoding subtype, seekability, and derived values.

Properties

Property	Type	Description
frames	int	Total frame count
channels	int	Number of audio channels
sampleRate	int	Sample rate in Hz
format	AudioFormat	Container format
sampleFormat	SampleFormat	Encoding subtype
sections	int	Number of data sections
seekable	bool	Whether the file supports seeking

Factory Methods

fromCData()

Create from an already-populated libsndfile SF_INFO struct. Internal use.

public static function fromCData(FFI\CData $sfInfo): self

Methods

duration()

Duration of the audio in seconds.

public function duration(): float

Returns 0.0 if sampleRate is 0.

nSamples()

Total number of individual sample values.

public function nSamples(): int

Equivalent to $frames * $channels.

withFrames()

public function withFrames(int $f): self

withChannels()

public function withChannels(int $c): self

withSampleRate()

public function withSampleRate(int $sr): self

Example:

$info = sf_info('song.wav');
$modified = $info->withSampleRate(48000)->withChannels(1);