Support for Fade Compensation in libx264

0001-Support-for-Fade-Compensation-in-libx264.patch

From bcd7b1ac1f688c082bccc7296e4461b1e8bff331 Mon Sep 17 00:00:00 2001
From: Stephen Hutchinson <[email protected]>
Date: Wed, 8 May 2013 00:19:52 -0400
Subject: [PATCH] Support for Fade Compensation in libx264.

Special-casing this is probably beyond my abilities, so this patch
can *only* be used with builds of libx264 that use the fadecomp
patch, as it will probably fail to build against non-fadecomp builds.
---
 libavcodec/libx264.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavcodec/libx264.c b/libavcodec/libx264.c
index 13d3ff2..e0873cf 100644
--- a/libavcodec/libx264.c
+++ b/libavcodec/libx264.c
@@ -55,6 +55,7 @@ typedef struct X264Context {
     int cqp;
     int aq_mode;
     float aq_strength;
+    float fade_compensate;
     char *psy_rd;
     int psy;
     int rc_lookahead;
@@ -412,6 +413,8 @@ static av_cold int X264_init(AVCodecContext *avctx)
         x4->params.rc.i_aq_mode = x4->aq_mode;
     if (x4->aq_strength >= 0)
         x4->params.rc.f_aq_strength = x4->aq_strength;
+    if (x4->fade_compensate >= 0)
+        x4->params.rc.f_fade_compensate = x4->fade_compensate;
     PARSE_X264_OPT("psy-rd", psy_rd);
     PARSE_X264_OPT("deblock", deblock);
     PARSE_X264_OPT("partitions", partitions);
@@ -643,6 +646,7 @@ static const AVOption options[] = {
     { "variance",      "Variance AQ (complexity mask)",   0, AV_OPT_TYPE_CONST, {.i64 = X264_AQ_VARIANCE},     INT_MIN, INT_MAX, VE, "aq_mode" },
     { "autovariance",  "Auto-variance AQ (experimental)", 0, AV_OPT_TYPE_CONST, {.i64 = X264_AQ_AUTOVARIANCE}, INT_MIN, INT_MAX, VE, "aq_mode" },
     { "aq-strength",   "AQ strength. Reduces blocking and blurring in flat and textured areas.", OFFSET(aq_strength), AV_OPT_TYPE_FLOAT, {.dbl = -1}, -1, FLT_MAX, VE},
+    { "fade-compensate",   "Fade compensation. Tries to allot more bitrate to fades.", OFFSET(fade_compensate), AV_OPT_TYPE_FLOAT, {.dbl = -1}, -1, FLT_MAX, VE},
     { "psy",           "Use psychovisual optimizations.",                 OFFSET(psy),           AV_OPT_TYPE_INT,    { .i64 = -1 }, -1, 1, VE },
     { "psy-rd",        "Strength of psychovisual optimization, in <psy-rd>:<psy-trellis> format.", OFFSET(psy_rd), AV_OPT_TYPE_STRING,  {0 }, 0, 0, VE},
     { "rc-lookahead",  "Number of frames to look ahead for frametype and ratecontrol", OFFSET(rc_lookahead), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, VE },
-- 
1.8.1.2