[Libav-user] Convert and resample 16-bit linear PCM (16k HZ) to 8-bit A-law (8k HZ)

[Baumgarten, Julien]

Hi folks,

Currently, I am currently working on rewriting a python source code into
C++.
In python, the pydub library is awesome for manipulating audio streams.
However, in C++ it seems to be a bit harder.

My program fetches some 16-bit linear PCM samples in 16k HZ from a socket
and should convert and resample it to 8-bit A-law in 8k HZ. Both should be
MONO channels.

What is the best way to do the job? Decode, encode + resample? Or is there
something more simple?

At the resample step, the source sample format is AV_SAMPLE_FMT_S16 but
what sample format should I use for my needs? AV_SAMPLE_FMT_U8
or AV_SAMPLE_FMT_U8P?

Yours sincerely,
Julien BAUMGARTEN


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