lavfi/vf_paletteuse: convert to framesync2.

libavfilter/Makefile

@@ -249,7 +249,7 @@ OBJS-$(CONFIG_OVERLAY_FILTER)                += vf_overlay.o framesync2.o
 OBJS-$(CONFIG_OWDENOISE_FILTER)              += vf_owdenoise.o
 OBJS-$(CONFIG_PAD_FILTER)                    += vf_pad.o
 OBJS-$(CONFIG_PALETTEGEN_FILTER)             += vf_palettegen.o
-OBJS-$(CONFIG_PALETTEUSE_FILTER)             += vf_paletteuse.o dualinput.o framesync.o
+OBJS-$(CONFIG_PALETTEUSE_FILTER)             += vf_paletteuse.o framesync2.o
 OBJS-$(CONFIG_PERMS_FILTER)                  += f_perms.o
 OBJS-$(CONFIG_PERSPECTIVE_FILTER)            += vf_perspective.o
 OBJS-$(CONFIG_PHASE_FILTER)                  += vf_phase.o

libavfilter/vf_paletteuse.c

@@ -27,8 +27,10 @@
 #include "libavutil/internal.h"
 #include "libavutil/opt.h"
 #include "libavutil/qsort.h"
-#include "dualinput.h"
 #include "avfilter.h"
+#include "filters.h"
+#include "framesync2.h"
+#include "internal.h"
 
 enum dithering_mode {
     DITHERING_NONE,
@@ -80,7 +82,7 @@ typedef int (*set_frame_func)(struct PaletteUseContext *s, AVFrame *out, AVFrame
 
 typedef struct PaletteUseContext {
     const AVClass *class;
-    FFDualInputContext dinput;
+    FFFrameSync fs;
     struct cache_node cache[CACHE_SIZE];    /* lookup cache */
     struct color_node map[AVPALETTE_COUNT]; /* 3D-Tree (KD-Tree with K=3) for reverse colormap */
     uint32_t palette[AVPALETTE_COUNT];
@@ -129,6 +131,8 @@ static const AVOption paletteuse_options[] = {
 
 AVFILTER_DEFINE_CLASS(paletteuse);
 
+static int load_apply_palette(FFFrameSync *fs);
+
 static int query_formats(AVFilterContext *ctx)
 {
     static const enum AVPixelFormat in_fmts[]    = {AV_PIX_FMT_RGB32, AV_PIX_FMT_NONE};
@@ -900,11 +904,18 @@ static int config_output(AVFilterLink *outlink)
     AVFilterContext *ctx = outlink->src;
     PaletteUseContext *s = ctx->priv;
 
+    ret = ff_framesync2_init_dualinput(&s->fs, ctx);
+    if (ret < 0)
+        return ret;
+    s->fs.opt_repeatlast = 1; // only 1 frame in the palette
+    s->fs.in[1].before = s->fs.in[1].after = EXT_INFINITY;
+    s->fs.on_event = load_apply_palette;
+
     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, &s->dinput)) < 0)
+    if ((ret = ff_framesync2_configure(&s->fs)) < 0)
         return ret;
     return 0;
 }
@@ -951,21 +962,32 @@ static void load_palette(PaletteUseContext *s, const AVFrame *palette_frame)
         s->palette_loaded = 1;
 }
 
-static AVFrame *load_apply_palette(AVFilterContext *ctx, AVFrame *main,
-                                   const AVFrame *second)
+static int load_apply_palette(FFFrameSync *fs)
 {
+    AVFilterContext *ctx = fs->parent;
     AVFilterLink *inlink = ctx->inputs[0];
     PaletteUseContext *s = ctx->priv;
+    AVFrame *main, *second, *out;
+    int ret;
+
+    // writable for error diffusal dithering
+    ret = ff_framesync2_dualinput_get_writable(fs, &main, &second);
+    if (ret < 0)
+        return ret;
+    if (!main || !second) {
+        ret = AVERROR_BUG;
+        goto error;
+    }
     if (!s->palette_loaded) {
         load_palette(s, second);
     }
-    return apply_palette(inlink, main);
-}
+    out = apply_palette(inlink, main);
+    return ff_filter_frame(ctx->outputs[0], out);
 
-static int filter_frame(AVFilterLink *inlink, AVFrame *in)
-{
-    PaletteUseContext *s = inlink->dst->priv;
-    return ff_dualinput_filter_frame(&s->dinput, inlink, in);
+error:
+    av_frame_free(&main);
+    av_frame_free(&second);
+    return ret;
 }
 
 #define DEFINE_SET_FRAME(color_search, name, value)                             \
@@ -1013,9 +1035,6 @@ static int dither_value(int p)
 static av_cold int init(AVFilterContext *ctx)
 {
     PaletteUseContext *s = ctx->priv;
-    s->dinput.repeatlast = 1; // only 1 frame in the palette
-    s->dinput.skip_initial_unpaired = 1;
-    s->dinput.process    = load_apply_palette;
 
     s->set_frame = set_frame_lut[s->color_search_method][s->dither];
 
@@ -1030,10 +1049,10 @@ static av_cold int init(AVFilterContext *ctx)
     return 0;
 }
 
-static int request_frame(AVFilterLink *outlink)
+static int activate(AVFilterContext *ctx)
 {
-    PaletteUseContext *s = outlink->src->priv;
-    return ff_dualinput_request_frame(&s->dinput, outlink);
+    PaletteUseContext *s = ctx->priv;
+    return ff_framesync2_activate(&s->fs);
 }
 
 static av_cold void uninit(AVFilterContext *ctx)
@@ -1041,7 +1060,7 @@ static av_cold void uninit(AVFilterContext *ctx)
     int i;
     PaletteUseContext *s = ctx->priv;
 
-    ff_dualinput_uninit(&s->dinput);
+    ff_framesync2_uninit(&s->fs);
     for (i = 0; i < CACHE_SIZE; i++)
         av_freep(&s->cache[i].entries);
     av_frame_free(&s->last_in);
@@ -1052,13 +1071,10 @@ static const AVFilterPad paletteuse_inputs[] = {
     {
         .name           = "default",
         .type           = AVMEDIA_TYPE_VIDEO,
-        .filter_frame   = filter_frame,
-        .needs_writable = 1, // for error diffusal dithering
     },{
         .name           = "palette",
         .type           = AVMEDIA_TYPE_VIDEO,
         .config_props   = config_input_palette,
-        .filter_frame   = filter_frame,
     },
     { NULL }
 };
@@ -1068,7 +1084,6 @@ static const AVFilterPad paletteuse_outputs[] = {
         .name          = "default",
         .type          = AVMEDIA_TYPE_VIDEO,
         .config_props  = config_output,
-        .request_frame = request_frame,
     },
     { NULL }
 };
@@ -1080,6 +1095,7 @@ AVFilter ff_vf_paletteuse = {
     .query_formats = query_formats,
     .init          = init,
     .uninit        = uninit,
+    .activate      = activate,
     .inputs        = paletteuse_inputs,
     .outputs       = paletteuse_outputs,
     .priv_class    = &paletteuse_class,