A class to do audio compression/limiting. More...
#include <AsyncAudioCompressor.h>
A class to do audio compression/limiting.
Use this audio pipe class to do compression on an audio stream. Compression is a method to reduce the dynamic range of an audio signal. After it has been compressed it can be amplified to get a more audible end result.
This audio pipe component is mostly untested and is based on some ripped off code which I really have not checked how it performs or if it works at all...
Definition at line 169 of file AsyncAudioCompressor.h.
Async::AudioCompressor::AudioCompressor | ( | void | ) |
Default constuctor.
Async::AudioCompressor::~AudioCompressor | ( | void | ) |
Destructor.
virtual void Async::AudioCompressor::processSamples | ( | float * | dest, | |
const float * | src, | |||
int | count | |||
) | [protected, virtual] |
Process incoming samples and put them into the output buffer.
dest | Destination buffer | |
src | Source buffer | |
count | Number of samples in the source buffer |
This function should be reimplemented by the inheriting class to do the actual processing of the incoming samples. All samples must be processed, otherwise they are lost and the output buffer will contain garbage.
Implements Async::AudioProcessor.
void Async::AudioCompressor::reset | ( | void | ) |
Reset the compressor.
void Async::AudioCompressor::setAttack | ( | double | attack_ms | ) | [inline] |
Set the compressor attack time.
attack_ms | The attack time in milliseconds |
Definition at line 201 of file AsyncAudioCompressor.h.
References Async::EnvelopeDetector::setTc().
void Async::AudioCompressor::setDecay | ( | double | decay_ms | ) | [inline] |
Set the compressor decay time.
decay_ms | The decay time in milliseconds |
Definition at line 207 of file AsyncAudioCompressor.h.
References Async::EnvelopeDetector::setTc().
void Async::AudioCompressor::setOutputGain | ( | float | gain | ) |
Set the output gain.
gain | The gain to set. |
The output gain is the amplification applied to the audio signal before it leaves the compressor. If gain > 1 the signal is amplified. If gain < 1 the signal is attenuated.
void Async::AudioCompressor::setRatio | ( | double | ratio | ) | [inline] |
Set the compression ratio.
ratio | The compression ratio (ex 0.1 == 10:1) |
Definition at line 195 of file AsyncAudioCompressor.h.
void Async::AudioCompressor::setThreshold | ( | double | thresh_db | ) | [inline] |
Set the compression threshold.
thresh_db | The compression threshold in dB |
The threshold is the level, in dB, the signal must rise to before the compressor kicks in.
Definition at line 189 of file AsyncAudioCompressor.h.