Voice compressing in STM32L4

[RFlod.2]

I need to compress voice in STM32L4. Here are my requirements:

* STM32L4 run at maximum 80 MHz

* Voice to be sampled by ADC/DMA

* Flash usage for voice compression < 50 kBytes

* RAM usage for voice compression < 64 kBytes

* Compressed data < 10% of orignal data

* Compress library shall not be GPL (cannot disclose all source code in my project)

* Compressed voice need to be decompressed at Linux OS

So I have searched some libraries and here are my findings:

* ST Opus Cube

- Flash size to big, 163 kBytes

* Speex_STM32_master

- GPL license

* STM32F10x_AN2812_FW_V2.0.0 (speex library)

- Contains assembler files for STM32F1

*  ST X-CUBE-AUDIO

- Only for STM32F4 and STM32F7

So non of these solutions fits my requirements. Any other ideas?

[Danish1]

Stm32F1 and stm32L4 both have arm cortex M processors.

What problems do you get offering the STM32F1 assembly files to an assembler for L4?

[RFlod.2]

STM32F1 uses M3 core

STM32L4 uses M4 core

I do not want to put a lot effort into getting it to work if there is an obvious issue.

[unsigned_char_array]

Opus is BSD licensed. If that works for you you can use a non-ST port/implementation of OPUS.

https://opus-codec.org/license/
https://github.com/xiph/opus