Re: [payload] VP8 payload, decoder processing capabilities

["Sandy (Alexander) MacInnis" <[e-mail]>]

I have another question about this.

Background:
In the VP8 bitstream spec, and in the payload draft, the use of multiple coefficient partitions is optional and not required. 

A VP8 decoder might use multi-threaded processing, such that it can achieve significantly greater throughput by decoding multiple coefficient partitions in parallel. Such a decoder might rely on the presence of a certain number of coefficient partitions in order to achieve a certain level of throughput.

For example, some receiver might comprise a multi-threaded decoder that can decode 1920x1080p60 if the stream has at least four coefficient partitions, but if the stream has only one coefficient partition it might be limited to a significantly smaller product of frame size and frame rate.

Question: With the current draft, how does a multi-threaded decoder know in advance how many coefficient partitions the stream uses, so it can decide whether it can decode a stream of a given frame size and frame rate? Or does this aspect not matter?

--Sandy (Alexander) MacInnis
Broadcom

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