AudioFFT for ARM processors that provided Cmsis DSP. More...
#include <AudioCmsisFFT.h>
Inheritance diagram for AudioCmsisFFT:
Public Member Functions | |
| virtual void | addNotifyAudioChange (AudioInfoSupport &bi) |
| Adds target to be notified about audio changes. | |
| float * | array () |
| Provides the result array returned by CMSIS FFT. | |
| virtual AudioInfo | audioInfo () override |
| provides the actual input AudioInfo | |
| virtual AudioInfo | audioInfoOut () |
| provides the actual output AudioInfo: this is usually the same as audioInfo() unless we use a transforming stream | |
| int | availableForWrite () override |
| We try to fill the buffer at once. | |
| bool | begin () override |
| starts the processing | |
| bool | begin (AudioFFTConfig info) |
| starts the processing | |
| virtual bool | begin (AudioInfo info) |
| virtual void | clearNotifyAudioChange () |
| Deletes all change notify subscriptions. | |
| AudioFFTConfig & | config () |
| Provides the actual configuration. | |
| AudioFFTConfig | defaultConfig () |
| Provides the default configuration. | |
| FFTDriver * | driver () |
| provides access to the FFTDriver which implements the basic FFT functionality | |
| FFTDriverCmsisFFT * | driverEx () |
| void | end () override |
| Release the allocated memory. | |
| virtual void | flush () |
| float | frequency (int bin) |
| Determines the frequency of the indicated bin. | |
| bool | getBin (int pos, FFTBin &bin) |
| gets the value of a bin | |
| virtual bool | isDeletable () |
| If true we need to release the related memory in the destructor. | |
| bool | isInverseFFT () |
| Returns true if we need to calculate the inverse FFT. | |
| bool | isNotifyActive () |
| Checks if the automatic AudioInfo update is active. | |
| int | length () |
| The number of samples. | |
| float | magnitude (int bin) |
| Calculates the magnitude of the fft result to determine the max value (bin is 0 to size()) | |
| float | magnitudeFast (int bin) |
| float * | magnitudes () |
| float * | magnitudesFast () |
| Provides the magnitudes w/o calling the square root function as array of size size(). Please note that this method is allocating additinal memory! | |
| operator bool () | |
| virtual bool | removeNotifyAudioChange (AudioInfoSupport &bi) |
| Removes a target in order not to be notified about audio changes. | |
| void | reset () |
| Just resets the current_pos e.g. to start a new cycle. | |
| AudioFFTResult | result () |
| template<int N> | |
| void | resultArray (AudioFFTResult(&result)[N]) |
| Determines the N biggest result values. | |
| unsigned long | resultTime () |
| time after the fft: time when the last result was provided - you can poll this to check if we have a new result | |
| unsigned long | resultTimeBegin () |
| time before the fft | |
| void | setAudioInfo (AudioInfo info) override |
| Notify change of audio information. | |
| bool | setBin (int idx, float real, float img) |
| sets the value of a bin | |
| bool | setBin (int pos, FFTBin &bin) |
| sets the value of a bin | |
| void | setNotifyActive (bool flag) |
| Deactivate/Reactivate automatic AudioInfo updates: (default is active) | |
| void | setOutput (Print &out) |
| Define final output for reverse ffft. | |
| int | size () |
| The number of bins used by the FFT which are relevant for the result. | |
| size_t | write (const uint8_t *data, size_t len) override |
| Provide the audio data as FFT input. | |
| virtual size_t | write (uint8_t ch) override |
| virtual void | writeSilence (size_t len) |
Protected Member Functions | |
| int | bytesPerSample () |
| template<typename T > | |
| void | fft () |
| template<int N> | |
| void | insertSorted (AudioFFTResult(&result)[N], AudioFFTResult tmp) |
| make sure that we do not reuse already found results | |
| bool | isPowerOfTwo (uint16_t x) |
| void | notifyAudioChange (AudioInfo info) |
| template<typename T > | |
| void | processSamples (const void *data, size_t samples) |
| void | rfft () |
| reverse fft if necessary | |
| template<typename T > | |
| T | windowedSample (T sample) |
| void | writeStrideBuffer (uint8_t *buffer, size_t len) |
Protected Attributes | |
| int | _timeout = 10 |
| int | bins = 0 |
| AudioFFTConfig | cfg |
| int | current_pos = 0 |
| bool | is_active = false |
| bool | is_notify_active = true |
| Vector< AudioInfoSupport * > | notify_vector |
| FFTDriver * | p_driver =nullptr |
| float * | p_magnitudes = nullptr |
| Print * | p_out = nullptr |
| float | rfft_max = 0 |
| RingBuffer< uint8_t > | stride_buffer {0} |
| unsigned long | timestamp =0l |
| unsigned long | timestamp_begin =0l |
| SingleBuffer< uint8_t > | tmp {MAX_SINGLE_CHARS} |
| int | tmpPos = 0 |
Detailed Description
AudioFFT for ARM processors that provided Cmsis DSP.
- Copyright
- GPLv3
Member Function Documentation
◆ writeSilence()
|
inlinevirtualinherited |
Writes n 0 values (= silence)
- Parameters
-
len
The documentation for this class was generated from the following file:
- src/AudioTools/AudioLibs/AudioCmsisFFT.h
