nhthn / canvas Goto Github PK

Particularly audible with chord filter, sounds like stuff is out of key.

As a developer, I want filters and draw functions to be regular functions rather than methods of App so filters are decoupled from SDL and GUI features and therefore easier to test.

AC:

• New source files filters.cpp and draw.cpp

As a user, I want to be able to control the decay time, damping, and dry/wet mix of the reverb beyond default settings.

AC:

• When clicking on the "reverb" filter, a menu should pop out with decay time, damping, and dry/wet sliders.
• There should be an "Apply" button that actually runs the filter.

log2(20e3 / 20) * 24, to be exact

AC:

• Square PD
• PWM

As a user, I would like to be able to stop and start playback and control speed.

AC:

• Speed slider
• Stop and play controls

As a user, I would like the initial phases of oscillators to be randomized to avoid a "laser" sound in audio export.

Add --seed argument to turbo mode.

As a developer, I would like the Windows version of Canvas to build in CI.

As a developer, I would like Synth to be regression tested so that I can refactor and optimize its code.

Requires upstream change.

Right now Synth uses a ton of CPU, find ways to vectorize computation.

• Add Google Bench library
• Add libsimdpp
• Vectorize Oscillator

As a user, I would like to add a delay effect to audio with a pitch shifter built in the feedback loop.

AC:

• Delay filter with feedback, stereo, cutoff, resonance, shift
• Feedback does the obvious thing
• Stereo controls difference in delay line sizes
• Cutoff is the cutoff of an LPF in the feedback loop
• Resonance is the resonance of the LPF
• Shift is the shift in the feedback loop in pixels

A macOS user on a HiDPI screen reported a window twice as large as it should be. Mouse events occur at half the coordinates of the actual mouse position, rendering the app nearly unusable.

As a GUI user, I would like audio import to have an "Auto speed" checkbox that results in the Speed slider being automatically set to match the speed of the audio.

As a turbo mode user, I would like the absence of the -s --speed marker to indicate auto speed mode when both importing and exporting audio.

As a user, I would like to add a reverse reverb effect to my sound.

AC:

• Checkbox added to Reverb popup
• Checkbox reverses computation of filter row-wise

As a user, I would like to load audio spectrogram-style to create a replica of the input sound.

AC:

• App::loadAudio loads audio using libsndfile
• Loaded audio is Hann-windowed by as many frames as there are pixels, and run through FFT using FFTW
• Magnitude spectrogram is converted from linear to log using triangular windows
• Log magnitude spectrogram is normalized and used as image

As a user, I would like to add harmonics to a signal.

AC:

• Harmonics filter added to toolbox
• Four sliders for amplitudes of four harmonics

via...

• Phase distortion, multiple algorithms?
• FM synthesis?
• Classic analog waveforms?

Currently leaning PD for now.

AC:

• Brush places pixels randomly with random alpha
• Gaussian distribution of X and Y displacement from center
• Horizontally aligned Draw/Erase/Spray buttons at top (or Draw/Erase, Spray/HLine?)

As a user, I would like to apply a filter to audio with choice of LPF, BPF, HPF, and notch filters, with the cutoff modulated by an LFO.

AC:

• Auto-filter added to list.
• Mode parameter has selection of LPF, BPF, HPF, notch.
• Cutoff parameter
• Resonance parameter
• LFO rate
• LFO depth
• LFO shape

As a user, I would like a filter that adds a spectrally uniform repeating envelope to the sound, with support for multiple envelope shapes and stereo.

AC:

• Tremolo effect added to filters list, with rate, depth, shape, and stereo controls
• Rate controls frequency of tremolo
• Depth controls depth of tremolo
• Shape controls shape of tremolo
• Shape options are sine, triangle, saw, ramp, and square
• Stereo controls phase offset of LFOs between left and right channels

As a user, I would like a batch mode that lets me import or export sounds and images and apply filters to them.

As a developer, I would like a command-line interface to assist with integration testing.

Acceptance criteria:

• Refactor to separate App from loading and saving functionality
• App supports --batch command-line mode
• Batch mode supports image and sound import/export
• Batch mode supports filters via --filter argument: --filter subharmonics(0.5,0.3,0.2,0.1,true)
• Multiple filters supported: --filter reverb(0.5,0.4) --filter scale_filter(C#,harmonic_minor)

• Buy an Apple developer license
• Build .dmg file for x86_64 architecture
• Build .dmg file for arm64 architecture

Change to allow arbitrary SR.

As a user, I would like to apply a repeat effect to audio similar to Ableton Live's Beat Repeat stock plugin (or a cruder version of it).

AC:

• Repeat effect popup added
• "Length" parameter controls length of repeat
• "Count" parameter controls number of counts
• "Probability" parameter controls probability of repeat

As a user, I would like to render a drawn image to an audio file in NRT.

As a user, I would like to resize the window and have the application behave correctly.

As a user, I would like to load images into Canvas.