[alsa-devel] HDMI audio: TV vs. codec supported sample rates

Stephen Warren swarren at nvidia.com
Tue Aug 3 18:04:40 CEST 2010

A user has the following setup:

A GPU which supports audio-over-HDMI. The codec supports sample rates 32000 44100 48000 88200 96000 176400 192000 (from /proc/asound/card1/codec#1). However, the user's TV supports only sample rates 44100 48000 88200 (from /proc/asound/card1/eld*).

When the user plays sound with sample rate 22050, they hear nothing. Sound with sample rates supported by the TV works OK.

My question: Is the HDA codec driver supposed to dynamically adjust its list of supported sample rates based on the ELD content, or is the ALSA library somehow supposed to detect the subset of rates supported in HW and convert the sample rate in SW before sending the audio to the driver?

Thanks for any insight.


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