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 <eclip...@gmx.net>
---
libavcodec/snowenc.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/libavcodec/snowenc.c b/libavcodec/snowenc.c
index b1cf1426ee..16d2b7c302 100644
--- a/libavcodec/snowenc.c
+++ b/libavcodec/snowenc.c
@@ -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 },
};
--
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