[M4IF Technotes] Decoder static test- frame buffer intercept method

[Jwalant Sumantrai Desai]

Hi Mike,
I assume you are performing this test for verifying the accuracy of your fast
IDCT algorithm and also to prove compliance of your decoder.
You can do the static tests without modifying the momusys reference code.
Actually you need to modify your decoder code. Please follow the steps below:
1. First use the momusys decoder to generate the output yuv file.
2. Now modify your decoder as follows:
    (a) I assume your most recently decoded YUV buffer will be the reference YUV
buffer for the next VOP decode.
    (b) Write your most recently decoded buffer to file and then discard it.
    (c) Load the same buffer using the previously decoded data (of momusys) in
step 1.
    (d) Now momusys decoded output will be used as the reference for next VOP
decoding.
    (e) Continue this process for all VOPs.
    (f) Finally do a file compare between your output and momusys output.
Note: The standard mentions that this test is to be done off-line and cannot be
done in real-time environment.
Hope I am clear.
rgds
Jwalant
Mike Welsh wrote:
> >From the standard for conformance testing it states that the static test,
> frame buffer intercept method, can be completed using the reference decoder.
> >From readme.txt for the momusys reference decoder, it appears that it is not
> possible to use previously generated samples reconstructed by the decoder
> under test with the reference decoder.
>
> Is it necessary to alter the reference decoder source code to complete this
> procedure, have I got the above wrong, or does someone have some useful
> knowledge in completing this test?
>
> Thanks,
>
> Mike Welsh
>
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