libx264: add 'rc_lookahead' private option.

Deprecate corresponding global option.

libavcodec/avcodec.h

@@ -2756,7 +2756,6 @@ typedef struct AVCodecContext {
      * - decoding: unused
      */
     attribute_deprecated float psy_trellis;
-#endif
 
     /**
      * RC lookahead
@@ -2764,7 +2763,8 @@ typedef struct AVCodecContext {
      * - encoding: Set by user
      * - decoding: unused
      */
-    int rc_lookahead;
+    attribute_deprecated int rc_lookahead;
+#endif
 
     /**
      * Constant rate factor maximum

libavcodec/libx264.c

@@ -47,6 +47,7 @@ typedef struct X264Context {
     float aq_strength;
     float psy_rd;
     float psy_trellis;
+    int rc_lookahead;
 } X264Context;
 
 static void X264_log(void *p, int level, const char *fmt, va_list args)
@@ -238,8 +239,6 @@ static av_cold int X264_init(AVCodecContext *avctx)
         x4->params.analyse.i_me_method = X264_ME_TESA;
     else x4->params.analyse.i_me_method = X264_ME_HEX;
 
-    x4->params.rc.i_lookahead             = avctx->rc_lookahead;
-
     x4->params.analyse.b_psy              = avctx->flags2 & CODEC_FLAG2_PSY;
 
     x4->params.analyse.i_me_range         = avctx->me_range;
@@ -317,6 +316,8 @@ static av_cold int X264_init(AVCodecContext *avctx)
         x4->params.analyse.f_psy_rd           = avctx->psy_rd;
     if (avctx->psy_trellis >= 0)
         x4->params.analyse.f_psy_trellis      = avctx->psy_trellis;
+    if (avctx->rc_lookahead >= 0)
+        x4->params.rc.i_lookahead             = avctx->rc_lookahead;
 #endif
 
     if (x4->aq_mode >= 0)
@@ -327,6 +328,8 @@ static av_cold int X264_init(AVCodecContext *avctx)
         x4->params.analyse.f_psy_rd = x4->psy_rd;
     if (x4->psy_trellis >= 0)
         x4->params.analyse.f_psy_trellis = x4->psy_trellis;
+    if (x4->rc_lookahead >= 0)
+        x4->params.rc.i_lookahead = x4->rc_lookahead;
 
 
     if (x4->fastfirstpass)
@@ -410,6 +413,7 @@ static const AVOption options[] = {
     { "aq_strength",   "AQ strength. Reduces blocking and blurring in flat and textured areas.", OFFSET(aq_strength), FF_OPT_TYPE_FLOAT, {-1}, -1, FLT_MAX, VE},
     { "pdy_rd",        "Psy RD strength.",                                OFFSET(psy_rd),        FF_OPT_TYPE_FLOAT,  {-1 }, -1, FLT_MAX, VE},
     { "psy_trellis",   "Psy trellis strength",                            OFFSET(psy_trellis),   FF_OPT_TYPE_FLOAT,  {-1 }, -1, FLT_MAX, VE},
+    { "rc_lookahead",  "Number of frames to look ahead for frametype and ratecontrol", OFFSET(rc_lookahead), FF_OPT_TYPE_INT, {-1 }, -1, INT_MAX, VE },
     { NULL },
 };
 

libavcodec/options.c

@@ -442,8 +442,8 @@ static const AVOption options[]={
 {"psy_trellis", "specify psycho visual trellis", OFFSET(psy_trellis), FF_OPT_TYPE_FLOAT, {.dbl = -1 }, -1, FLT_MAX, V|E},
 {"aq_mode", "specify aq method", OFFSET(aq_mode), FF_OPT_TYPE_INT, {.dbl = -1 }, -1, INT_MAX, V|E},
 {"aq_strength", "specify aq strength", OFFSET(aq_strength), FF_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1, FLT_MAX, V|E},
-#endif
 {"rc_lookahead", "specify number of frames to look ahead for frametype", OFFSET(rc_lookahead), FF_OPT_TYPE_INT, {.dbl = 40 }, 0, INT_MAX, V|E},
+#endif
 {"ssim", "ssim will be calculated during encoding", 0, FF_OPT_TYPE_CONST, {.dbl = CODEC_FLAG2_SSIM }, INT_MIN, INT_MAX, V|E, "flags2"},
 {"intra_refresh", "use periodic insertion of intra blocks instead of keyframes", 0, FF_OPT_TYPE_CONST, {.dbl = CODEC_FLAG2_INTRA_REFRESH }, INT_MIN, INT_MAX, V|E, "flags2"},
 {"crf_max", "in crf mode, prevents vbv from lowering quality beyond this point", OFFSET(crf_max), FF_OPT_TYPE_FLOAT, {.dbl = DEFAULT }, 0, 51, V|E},