On 11/4/14, 3:40 PM, D K wrote:

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Hi, I recently came across the compressed audio framework used with

ALSA-SOC.

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Can the framework be used to send compressed audio to HDMI driver?.Like using tinycompress from usespace . thanks,

HDMI already supports IEC modes when you can send AC3, DTS, etc payloads without decoding. All you need to do is packetize the data in userspace and send the result over the HDMI PCM device (and set some control bits to help the receiver lock faster).

Apologies for jumping in on this subject, I'm wondering if anyone knows if this method is of sending audio over HDMI is aplocable to DSD streams too?

The reasoning being that once audio is compressed, and encoded (AC3, DTS, etc), there is not much inherently "PCM" about it. It only becomes PCM again after it is decoded and uncompressed, right?

In short, it is simply a bitstream, packetized and with "some control bits set". Which is exactly what I see in HDMI specs in regards to DSD.

So, does anyone know of a reason why this same method wont work for sending DSD bitstream over HDMI?

Any advice very much appreciated!

Kind regards, Andrej Falout