Re: [Linphone-developers] Interested in figuring out how to use the L16 codec for uncompressed audio data samples at a sampling rate of 8Khz

[Henrik Pauli]

Hi,

Quoting from the documentation I referred to earlier:

## Audio codec descriptions
# These sections are named audio_codec_X, where X is a number.
# This number identifies the position of the described codec
# in the core's audio codec list.
[audio_codec_0]
# sub-mime type as defined in RFC3551 or codec's specific RFC:
mime=speex
# RTP clock-rate as defined in RFC3551 or codec's specific RFC:
rate=8000
# Tells whether is codec is enabled
enabled=1
# Fmtp (format parameters) string to be sent in SDP for this codec, which
# corresponds usually to what we are prefering to receive.
# RFC3551 or codec's specific RFC describes the allowed parameters.
recv_fmtp=vad=on

So what you seem to need to do in your linphonerc is to put the L16 mime in with a rate of 8000 as the only codec specified and see if it works.

On 10/08/17 22:40, Davis Roman wrote:

Hi Hendrik,

I'm working with on an embedded linux device with linphone ( no gui ) and an onboard cellular radio ( The radio's PCM interface is connected to the processor's i2s bus)

Based on the cell radio's documentation, it seems I need to configure linphone to work with PCM data that is formatted as 16-bit uncompressed two’s complement at a sample rate of 8khz.

So it initially seemed to be that L16 could fit here as long as it ran at 8Khz.

Any idea where in the  linphone repo I would have to look in order to configure this?

Thank you,

Davis

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