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28 lines
1.4 KiB
Markdown
28 lines
1.4 KiB
Markdown
2 years ago
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# Music player demo
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## Overview
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The music player demo shows what kind of modern, smartphone-like user interfaces can be created on LVGL. It works the best with display with 480x272 or 272x480 resolution.
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## Run the demo
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- In `lv_conf.h` or equivalent places set `LV_USE_DEMO_MUSIC 1`
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- With `LV_DEMO_MUSIC_AUTO_PLAY` enabled a ~60 sec demo will be played.
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- After `lv_init()` and initializing the drivers call `lv_demo_music()`
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## How the spectrum animation works
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- `assets/spectrum.py` creates an array of spectrum values from a music. 4 band are created with 33 samples/sec: bass, bass-mid, mid, mid-treble.
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- The spectrum meter UI does the followings:
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- Zoom the album cover proportionality to the current bass value
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- Display the 4 bands on the left side of a circle by default at 0°, 45°, 90°, 135°
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- Add extra bars next to the "main bars" with a cosine shape. Add more bars for the lower bands.
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- If there is a large enough bass, add a random offset to the position of the bars. E.g. start from 63° instead of 0°. (bars greater than 180° start again from 0°)
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- If there is no bass, add 1 to the offset of the bars (it creates a "walking" effect)
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- Mirror the bars to the right side of the circle
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## Using spectrum.py
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- install `librosa` with `pip3 install librosa`
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- run `python sectrum.py my_file.mp3`
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- see the result in `spectrum.h`
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