File format priority in playback

Asterisk Asterisk Support
1

Hello,

I have cases when the same prompt for playback exist in multiple formats (like ulaw, sln etc). Is there a way to know which format will Asterisk pick? Can I set the order of priority?

Thanks,

2

The one with the lowest cost in “core show translations”, given the target codec.

The order is fixed by the computed cost of the translation.

1 Like
3

I see. That’s make life complecated… If my core show channel xxx shows the following, what is the base codec, g722 or alaw?
NativeFormats: (alaw)
WriteFormat: g722
ReadFormat: alaw

4

The base codec, that is going out over the wire, is g722.

5

So, in the case bellow, the codec used over the wire is adpcm? And what is the meaning of the tanslation chain here?

NativeFormats: (alaw)
WriteFormat: adpcm
ReadFormat: alaw
WriteTranscode: Yes (adpcm@8000)->(slin@8000)->(alaw@8000)

Thanks.

6

Sorry, I thought I typed alaw instead of g722. Yeesh, one of those days. Here’s the key for information:

NativeFormats = what is going out over the wire
WriteFormat = what the current application or what is handling the channel is providing, which is translated to native format
ReadFormat = what the current application or what is handling the channel is expecting, which is translated from native format

7

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