From eacb3ec961035b39e4bf69b589df9b110f591710 Mon Sep 17 00:00:00 2001
From: Nicolas George <george@nsup.org>
Date: Mon, 31 Jul 2017 12:03:03 +0200
Subject: [PATCH] lavfi/vf_lut3d: convert to framesync2.

---
 libavfilter/Makefile   |  2 +-
 libavfilter/vf_lut3d.c | 49 ++++++++++++++++++++++--------------------
 2 files changed, 27 insertions(+), 24 deletions(-)

diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 06e3428e56..4b8c34d35b 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -197,7 +197,7 @@ OBJS-$(CONFIG_FSPP_FILTER)                   += vf_fspp.o
 OBJS-$(CONFIG_GBLUR_FILTER)                  += vf_gblur.o
 OBJS-$(CONFIG_GEQ_FILTER)                    += vf_geq.o
 OBJS-$(CONFIG_GRADFUN_FILTER)                += vf_gradfun.o
-OBJS-$(CONFIG_HALDCLUT_FILTER)               += vf_lut3d.o dualinput.o framesync.o
+OBJS-$(CONFIG_HALDCLUT_FILTER)               += vf_lut3d.o framesync2.o
 OBJS-$(CONFIG_HFLIP_FILTER)                  += vf_hflip.o
 OBJS-$(CONFIG_HISTEQ_FILTER)                 += vf_histeq.o
 OBJS-$(CONFIG_HISTOGRAM_FILTER)              += vf_histogram.o
diff --git a/libavfilter/vf_lut3d.c b/libavfilter/vf_lut3d.c
index 7a294b0761..5ba91f7e47 100644
--- a/libavfilter/vf_lut3d.c
+++ b/libavfilter/vf_lut3d.c
@@ -31,8 +31,8 @@
 #include "libavutil/avstring.h"
 #include "avfilter.h"
 #include "drawutils.h"
-#include "dualinput.h"
 #include "formats.h"
+#include "framesync2.h"
 #include "internal.h"
 #include "video.h"
 
@@ -70,7 +70,7 @@ typedef struct LUT3DContext {
     int clut_step;
     int clut_is16bit;
     int clut_width;
-    FFDualInputContext dinput;
+    FFFrameSync fs;
 #endif
 } LUT3DContext;
 
@@ -681,24 +681,21 @@ static int config_output(AVFilterLink *outlink)
     LUT3DContext *lut3d = ctx->priv;
     int ret;
 
+    ret = ff_framesync2_init_dualinput(&lut3d->fs, ctx);
+    if (ret < 0)
+        return ret;
     outlink->w = ctx->inputs[0]->w;
     outlink->h = ctx->inputs[0]->h;
     outlink->time_base = ctx->inputs[0]->time_base;
-    if ((ret = ff_dualinput_init(ctx, &lut3d->dinput)) < 0)
+    if ((ret = ff_framesync2_configure(&lut3d->fs)) < 0)
         return ret;
     return 0;
 }
 
-static int filter_frame_hald(AVFilterLink *inlink, AVFrame *inpicref)
-{
-    LUT3DContext *s = inlink->dst->priv;
-    return ff_dualinput_filter_frame(&s->dinput, inlink, inpicref);
-}
-
-static int request_frame(AVFilterLink *outlink)
+static int activate(AVFilterContext *ctx)
 {
-    LUT3DContext *s = outlink->src->priv;
-    return ff_dualinput_request_frame(&s->dinput, outlink);
+    LUT3DContext *s = ctx->priv;
+    return ff_framesync2_activate(&s->fs);
 }
 
 static int config_clut(AVFilterLink *inlink)
@@ -751,45 +748,50 @@ static int config_clut(AVFilterLink *inlink)
     return 0;
 }
 
-static AVFrame *update_apply_clut(AVFilterContext *ctx, AVFrame *main,
-                                  const AVFrame *second)
+static int update_apply_clut(FFFrameSync *fs)
 {
+    AVFilterContext *ctx = fs->parent;
     AVFilterLink *inlink = ctx->inputs[0];
+    AVFrame *main, *second, *out;
+    int ret;
+
+    ret = ff_framesync2_dualinput_get(fs, &main, &second);
+    if (ret < 0)
+        return ret;
+    if (!second)
+        return ff_filter_frame(ctx->outputs[0], main);
     update_clut(ctx->priv, second);
-    return apply_lut(inlink, main);
+    out = apply_lut(inlink, main);
+    return ff_filter_frame(ctx->outputs[0], out);
 }
 
 static av_cold int haldclut_init(AVFilterContext *ctx)
 {
     LUT3DContext *lut3d = ctx->priv;
-    lut3d->dinput.process = update_apply_clut;
+    lut3d->fs.on_event = update_apply_clut;
     return 0;
 }
 
 static av_cold void haldclut_uninit(AVFilterContext *ctx)
 {
     LUT3DContext *lut3d = ctx->priv;
-    ff_dualinput_uninit(&lut3d->dinput);
+    ff_framesync2_uninit(&lut3d->fs);
 }
 
 static const AVOption haldclut_options[] = {
-    { "shortest",   "force termination when the shortest input terminates", OFFSET(dinput.shortest),   AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
-    { "repeatlast", "continue applying the last clut after eos",            OFFSET(dinput.repeatlast), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS },
     COMMON_OPTIONS
 };
 
-AVFILTER_DEFINE_CLASS(haldclut);
+FRAMESYNC_DEFINE_CLASS(haldclut, LUT3DContext, fs);
 
 static const AVFilterPad haldclut_inputs[] = {
     {
         .name         = "main",
         .type         = AVMEDIA_TYPE_VIDEO,
-        .filter_frame = filter_frame_hald,
         .config_props = config_input,
     },{
         .name         = "clut",
         .type         = AVMEDIA_TYPE_VIDEO,
-        .filter_frame = filter_frame_hald,
         .config_props = config_clut,
     },
     { NULL }
@@ -799,7 +801,6 @@ static const AVFilterPad haldclut_outputs[] = {
     {
         .name          = "default",
         .type          = AVMEDIA_TYPE_VIDEO,
-        .request_frame = request_frame,
         .config_props  = config_output,
     },
     { NULL }
@@ -809,9 +810,11 @@ AVFilter ff_vf_haldclut = {
     .name          = "haldclut",
     .description   = NULL_IF_CONFIG_SMALL("Adjust colors using a Hald CLUT."),
     .priv_size     = sizeof(LUT3DContext),
+    .preinit       = haldclut_framesync_preinit,
     .init          = haldclut_init,
     .uninit        = haldclut_uninit,
     .query_formats = query_formats,
+    .activate      = activate,
     .inputs        = haldclut_inputs,
     .outputs       = haldclut_outputs,
     .priv_class    = &haldclut_class,