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https://github.com/sudara/melatonin_audio_sparklines
Sparklines For JUCE AudioBlocks
https://github.com/sudara/melatonin_audio_sparklines
dsp juce juce-modules sparklines
Last synced: about 1 month ago
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Sparklines For JUCE AudioBlocks
- Host: GitHub
- URL: https://github.com/sudara/melatonin_audio_sparklines
- Owner: sudara
- License: mit
- Created: 2021-06-05T18:07:59.000Z (about 3 years ago)
- Default Branch: main
- Last Pushed: 2023-08-25T15:19:39.000Z (10 months ago)
- Last Synced: 2024-02-06T20:07:34.342Z (4 months ago)
- Topics: dsp, juce, juce-modules, sparklines
- Language: Python
- Homepage:
- Size: 86.9 KB
- Stars: 89
- Watchers: 6
- Forks: 2
- Open Issues: 3
-
Metadata Files:
- Readme: README.md
- Funding: .github/FUNDING.yml
- License: LICENSE
Lists
- awesome-juce - melatonin_audio_sparklines
README
Read [my blog article on audio sparklines!](https://melatonin.dev/blog/audio-sparklines/)
# Melatonin Audio Sparklines
This is a C++ JUCE module that summarizes and visualizes what's in an [AudioBlock](https://docs.juce.com/master/classdsp_1_1AudioBlock.html).
It's nice to get a quick idea of what's happening to your JUCE audio buffers during development or tests.
## Installation
Set up a git submodule in your project tracking the `main` branch. I usually stick mine in a `modules` directory.
```git
git submodule add -b main https://github.com/sudara/melatonin_audio_sparklines modules/melatonin_audio_sparklines
git commit -m "Added melatonin_audio_sparklines submodule."
```
To update melatonin_audio_sparklines, you can:
```git
git submodule update --remote --merge modules/melatonin_audio_sparklines
```
If you use CMake (my condolences (jk jk)), inform JUCE about the module in your `CMakeLists.txt`:
```
juce_add_module("modules/melatonin_audio_sparklines")
```
Include the header where needed:
```
#include "melatonin_audio_sparklines/melatonin_audio_sparklines.h"
```
## JUCE Usage: printSparkline
Call `melatonin::printSparkline(myAudioBlock);` and under the hood, DBG will be called.
If you are lucky, you'll see a healthy looking wave (like this cutie little square wave) spat out into your console:
```
Block is 1 channel, 441 samples, min -0.999994, max 0.999994, 100% filled
[0⎺‾⎺x⎽_⎽]
```
Or a sine:
```
Block is 1 channel, 441 samples, min -0.999994, max 0.999994, 100% filled
[0—⎻⎺‾⎺⎻—x—⎼⎽_⎽⎼—]
```
You can output the sparkline in full sample-by-sample uncompressed glory with `melatonin::printSparkline(myAudioBlock, false)` or display it without normalization with `melatonin::printSparkline(myAudioBlock, true, false)`.
## lldb installation
Thanks to Jim Credland's [existing lldb formatters](https://github.com/jcredland/juce-toys/blob/master/juce_lldb_xcode.py) I felt bold enough to jump in and figure out how to get sparklines in your lldb-driven IDE.
Put this line in a file named ~/.lldbinit (create it if necessary), pointing to `sparklines.py`:
```
command script import ~/path/to/melatonin_audio_sparklines/sparklines.py
```
On hover you'll get a summary:
On click you'll get sparklines and the ability to browse samples:
If you'd like to read more about this, read my post on [creating lldb type summaries and children](https://melatonin.dev/blog/how-to-create-lldb-type-summaries-and-synthetic-children-for-your-custom-types/).
## Feature key
Here are what the symbols mean that will show up in the sparkline
```
0 = true 0
x = zero crossing
E = out of bounds (below -1.0 or above 1.0)
I = Inf (Infinity, meaning you've divided by zero)
N = NaN (undefined calculation that's not INF)
S = Subnormal detected
```
## Caveats
`printSparklines` was tested on VS2019 on Windows, Xcode on MacOS and CLion on Windows and MacOS.
The lldb python script was tested on MacOS CLion and Xcode only.
### Xcode gotcha
If you are using Xcode exclusively, you might want to plop this somewhere
```cpp
#define MELATONIN_SPARKLINE_XCODE=1
```
MacOS native font rendering seems to flip the height of two of the characters (⎺ vs. ‾) but it's fine in MacOS CLion, etc.
### Don't like how they look?
I'm not a fan of VS2019 with the default Consolas font. Everywhere else it seems to look good! Open an issue if you can make it nicer!
### Reminder: Don't leave a printSparkline call in your audio path
Not only does `DBG` itself allocate, but the whole name of the game is string manipulation here, so if you are sticking a `printSparkline` in your audio callback, expect those sweet sweet dropouts.