Andreas Rheinhardt 7b539ca3e6 avcodec/mpeg_er: Simplify disabling IDCT ...

The error resilience code does not make up block coefficients
and therefore zeroes them in order to disable the IDCT.
But this can be done in a simpler manner, namely by setting
block_last_index to a negative value. Doing so also has
the advantage that the dct_unquantize functions are never even
called for those codecs that do not use ff_mpv_reconstruct_mb()
for ordinary decoding (namely RV-30/40 and the VC-1 family).

This approach would not work for intra macroblocks (there is always
at least one coefficient for them and therefore there is no check
for block_last_index for them), but this does not happen at all.
Add an assert for this.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

2024-06-20 18:58:39 +02:00

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