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lavc/snowenc: Expose an option to set the rc_eq expression

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Snow uses the ratecontrol module, but does not expose a way to set
the rc_eq expression. The default expression, set in the ratecontrol
module, will always be used.

Make it possible to set rc_eq by adding an AVOption to snowenc.

The option definition is mostly a copy from the mpegvideo common
options definition of rc_eq (libavcodec/mpegvideo.h), with some
minor style adjustments to be closer to the other snowenc option
initializer expressions.

Signed-off-by: Alexander Strasser <eclipse7@gmx.net>
This commit is contained in:
Alexander Strasser 2020-08-07 21:40:40 +02:00
parent ecd71916d1
commit b40dd2fdab
1 changed files with 5 additions and 0 deletions
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5
libavcodec/snowenc.c
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@ -1948,6 +1948,11 @@ static const AVOption options[] = {
{ "pred", "Spatial decomposition type", OFFSET(pred), AV_OPT_TYPE_INT, { .i64 = 0 }, DWT_97, DWT_53, VE, "pred" },
{ "dwt97", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, INT_MIN, INT_MAX, VE, "pred" },
{ "dwt53", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, INT_MIN, INT_MAX, VE, "pred" },
{ "rc_eq", "Set rate control equation. When computing the expression, besides the standard functions "
"defined in the section 'Expression Evaluation', the following functions are available: "
"bits2qp(bits), qp2bits(qp). Also the following constants are available: iTex pTex tex mv "
"fCode iCount mcVar var isI isP isB avgQP qComp avgIITex avgPITex avgPPTex avgBPTex avgTex.",
OFFSET(m.rc_eq), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, VE },
{ NULL },
};