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Advise about ways to improve mp3 playback

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Closes: #6133
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Jeff Epler 2022-04-05 09:17:55 -05:00
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shared-bindings/audiomp3/MP3Decoder.c
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@ -44,6 +44,20 @@
//| :param typing.BinaryIO file: Already opened mp3 file
//| :param ~circuitpython_typing.WriteableBuffer buffer: Optional pre-allocated buffer, that will be split in half and used for double-buffering of the data. If not provided, two buffers are allocated internally. The specific buffer size required depends on the mp3 file.
//|
//| Playback of mp3 audio is CPU intensive, and the
//| exact limit depends on many factors such as the particular
//| microcontroller, SD card or flash performance, and other
//| code in use such as displayio. If playback is garbled,
//| skips, or plays as static, first try using a "simpler" mp3:
//|
//| * Use constant bit rate (CBR) not VBR or ABR (variable or average bit rate) when encoding your mp3 file
//| * Use a lower sample rate (e.g., 11.025kHz instead of 48kHz)
//| * Use a lower bit rate (e.g., 32kbit/s instead of 256kbit/s)
//|
//| Reduce activity taking place at the same time as
//| mp3 playback. For instance, only update small portions of a
//| displayio screen if audio is playing. Disable auto-refresh
//| and explicitly call refresh.
//|
//| Playing a mp3 file from flash::
//|