BeatDetector QML Type

Set this to a time in milliseconds to use as a time to fade out a detected beat's intensity. This volume is used in combination with envelopeDetector as a minimum intensity for the next detected beat.

Set this to an AudioEffect instance to apply to detect the audio signal's envelope. The envelope is then analyzed and whenever it rises significantly, beatDetected() is emitted.

Set this to a time in milliseconds to use as a minimum time distance between detected beats.

Set this to an AudioEffect instance to apply to the audio signal before starting beat detection.

You can set this to a VolumeDetector instance to apply to detect the audio signal's volume. This way you can have information about the detected beat's volume in beatDetected().

Emitted when a beat is detected. This happens ahead of time, when the beat is calculated from the current audio buffer.

The parameters contain information about the beat:

• currentTime: The current time in milliseconds since 1970/01/01 at the time the signal is emitted.
• sampleIndex: Index of the beat's sample, from the start of the audio signal. To calculate the beat's time in seconds since the start of the audio signal, divide by the MP3Decoder::sampleRate.
• envValue: The current amplitude of the audio signal's calculated envelope at the time of the beat. This value indicates the song's intensity at the time of the beat.
• diffValue: The is the current change in amplitude of the audio signal's calculated envelope at the time of the beat. This value indicates the beat's intensity. A beat is detected when the diffValue is at a local peak maximum.
• maxValue: The maximum value in the range for envValue. Usually this is 1.0.
• volume: The current volume of the audio signal at the time of the beat. This is only meaningful if BeatDetector::volumeDetector is set.

Reset the beat detection algorithm's state. Call this to treat the rest of the MP3Decoder's audio signal like a completely new audio signal.