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This option is only used by ffv1 and ffvhuff.
It is a very codec-specific option, so deprecate the global variant.
Improve documentation a little.
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
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FFv1 uses two types of coders, golomb and range with two different
tables. This is exposed this in a rather convoluted way, for example
mentioning to set coder type 1 while initializing the variable 'ac' to 2,
because encoder does not use range coder with default table.
Appropriate internal coder type values have been added and used in any
check rather than using raw numbers.
Initialization of avctx.coder_type in ffv1dec is removed because this
field is encoder only. An unneeded validation check in the encoder
is dropped too.
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
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warning: assigning to 'AVFrame *' (aka 'struct AVFrame *') from
'const AVFrame *' (aka 'const struct AVFrame *') discards
qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
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ffv1 does not use any part of the dsputil framework.
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Based on code from Carl Eugen Hoyos, Michael Niedermayer and Paul B Mahol.
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