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Mixing I2S + analog inputs into I2S output

Hi all,

Our customer's looking for a solution to the following problem: they have an analog audio source and an I2S audio source.  They need them mixed and output via I2S.  What's the most cost-effective way of achieving this?  Is there a codec + mixer that would enable us to do this?

This thread suggests a solution if we needed an analog output.  However, we need an I2S output, and we are hoping it can be done in one part.

Thank you.

- m