libavfilter/vf_lut2.c - manifest_repos/ffmpeg - Git at Google

 /*
  * Copyright (c) 2016 Paul B Mahol
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */

 #include "libavutil/attributes.h"
 #include "libavutil/common.h"
 #include "libavutil/eval.h"
 #include "libavutil/opt.h"
 #include "libavutil/pixdesc.h"
 #include "avfilter.h"
 #include "drawutils.h"
 #include "formats.h"
 #include "internal.h"
 #include "video.h"
 #include "framesync.h"

 static const char *const var_names[] = {
     "w",        ///< width of the input video
     "h",        ///< height of the input video
     "x",        ///< input value for the pixel from input #1
     "y",        ///< input value for the pixel from input #2
     "bdx",      ///< input #1 video bitdepth
     "bdy",      ///< input #2 video bitdepth
     NULL
 };

 enum var_name {
     VAR_W,
     VAR_H,
     VAR_X,
     VAR_Y,
     VAR_BITDEPTHX,
     VAR_BITDEPTHY,
     VAR_VARS_NB
 };

 typedef struct LUT2Context {
     const AVClass *class;
     FFFrameSync fs;

     int odepth;
     char   *comp_expr_str[4];

     AVExpr *comp_expr[4];
     double var_values[VAR_VARS_NB];
     uint16_t *lut[4];  ///< lookup table for each component
     int width[4], height[4];
     int widthx[4], heightx[4];
     int widthy[4], heighty[4];
     int nb_planesx;
     int nb_planesy;
     int nb_planes;
     int depth, depthx, depthy;
     int tlut2;
     AVFrame *prev_frame;        /* only used with tlut2 */

     int (*lut2)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
 } LUT2Context;

 typedef struct ThreadData {
     AVFrame *out, *srcx, *srcy;
 } ThreadData;

 #define OFFSET(x) offsetof(LUT2Context, x)
 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

 static const AVOption options[] = {
     { "c0", "set component #0 expression", OFFSET(comp_expr_str[0]),  AV_OPT_TYPE_STRING, { .str = "x" }, .flags = FLAGS },
     { "c1", "set component #1 expression", OFFSET(comp_expr_str[1]),  AV_OPT_TYPE_STRING, { .str = "x" }, .flags = FLAGS },
     { "c2", "set component #2 expression", OFFSET(comp_expr_str[2]),  AV_OPT_TYPE_STRING, { .str = "x" }, .flags = FLAGS },
     { "c3", "set component #3 expression", OFFSET(comp_expr_str[3]),  AV_OPT_TYPE_STRING, { .str = "x" }, .flags = FLAGS },
     { "d",  "set output depth",            OFFSET(odepth),            AV_OPT_TYPE_INT,    { .i64 =  0  }, 0, 16, .flags = FLAGS },
     { NULL }
 };

 static av_cold void uninit(AVFilterContext *ctx)
 {
     LUT2Context *s = ctx->priv;
     int i;

     ff_framesync_uninit(&s->fs);
     av_frame_free(&s->prev_frame);

     for (i = 0; i < 4; i++) {
         av_expr_free(s->comp_expr[i]);
         s->comp_expr[i] = NULL;
         av_freep(&s->comp_expr_str[i]);
         av_freep(&s->lut[i]);
     }
 }

 #define BIT8_FMTS \
     AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P, \
     AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, \
     AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P, \
     AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P, \
     AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, \
     AV_PIX_FMT_GRAY8, AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,

 #define BIT9_FMTS \
     AV_PIX_FMT_GBRP9, AV_PIX_FMT_GRAY9, \
     AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9, \
     AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,

 #define BIT10_FMTS \
     AV_PIX_FMT_GRAY10, AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRAP10, \
     AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10, \
     AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,

 #define BIT12_FMTS \
     AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV440P12, \
     AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12, \
     AV_PIX_FMT_GRAY12, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRP12,

 #define BIT14_FMTS \
     AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14, \
     AV_PIX_FMT_GRAY14, AV_PIX_FMT_GBRP14,

 #define BIT16_FMTS \
     AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16, \
     AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16, \
     AV_PIX_FMT_GBRP16, AV_PIX_FMT_GBRAP16, AV_PIX_FMT_GRAY16,

 static int query_formats(AVFilterContext *ctx)
 {
     LUT2Context *s = ctx->priv;
     static const enum AVPixelFormat all_pix_fmts[] = {
         BIT8_FMTS
         BIT9_FMTS
         BIT10_FMTS
         BIT12_FMTS
         AV_PIX_FMT_NONE
     };
     static const enum AVPixelFormat bit8_pix_fmts[] = {
         BIT8_FMTS
         AV_PIX_FMT_NONE
     };
     static const enum AVPixelFormat bit9_pix_fmts[] = {
         BIT9_FMTS
         AV_PIX_FMT_NONE
     };
     static const enum AVPixelFormat bit10_pix_fmts[] = {
         BIT10_FMTS
         AV_PIX_FMT_NONE
     };
     static const enum AVPixelFormat bit12_pix_fmts[] = {
         BIT12_FMTS
         AV_PIX_FMT_NONE
     };
     static const enum AVPixelFormat bit14_pix_fmts[] = {
         BIT14_FMTS
         AV_PIX_FMT_NONE
     };
     static const enum AVPixelFormat bit16_pix_fmts[] = {
         BIT16_FMTS
         AV_PIX_FMT_NONE
     };
     const enum AVPixelFormat *pix_fmts;
     int ret;

     if (s->tlut2 || !s->odepth)
         return ff_set_common_formats(ctx, ff_make_format_list(all_pix_fmts));

     ret = ff_formats_ref(ff_make_format_list(all_pix_fmts), &ctx->inputs[0]->outcfg.formats);
     if (ret < 0)
         return ret;

     switch (s->odepth) {
     case 8:  pix_fmts = bit8_pix_fmts;  break;
     case 9:  pix_fmts = bit9_pix_fmts;  break;
     case 10: pix_fmts = bit10_pix_fmts; break;
     case 12: pix_fmts = bit12_pix_fmts; break;
     case 14: pix_fmts = bit14_pix_fmts; break;
     case 16: pix_fmts = bit16_pix_fmts; break;
     default: av_log(ctx, AV_LOG_ERROR, "Unsupported output bit depth %d.\n", s->odepth);
              return AVERROR(EINVAL);
     }

     return ff_formats_ref(ff_make_format_list(pix_fmts), &ctx->outputs[0]->incfg.formats);
 }

 static int config_inputx(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
     LUT2Context *s = ctx->priv;
     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
     int hsub = desc->log2_chroma_w;
     int vsub = desc->log2_chroma_h;

     s->nb_planesx = av_pix_fmt_count_planes(inlink->format);
     s->heightx[1] = s->heightx[2] = AV_CEIL_RSHIFT(inlink->h, vsub);
     s->heightx[0] = s->heightx[3] = inlink->h;
     s->widthx[1]  = s->widthx[2]  = AV_CEIL_RSHIFT(inlink->w, hsub);
     s->widthx[0]  = s->widthx[3]  = inlink->w;

     s->var_values[VAR_W] = inlink->w;
     s->var_values[VAR_H] = inlink->h;
     s->depthx = desc->comp[0].depth;
     s->var_values[VAR_BITDEPTHX] = s->depthx;

     if (s->tlut2) {
         s->depthy = desc->comp[0].depth;
         s->var_values[VAR_BITDEPTHY] = s->depthy;
     }

     return 0;
 }

 static int config_inputy(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
     LUT2Context *s = ctx->priv;
     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
     int hsub = desc->log2_chroma_w;
     int vsub = desc->log2_chroma_h;

     s->nb_planesy = av_pix_fmt_count_planes(inlink->format);
     s->depthy = desc->comp[0].depth;
     s->var_values[VAR_BITDEPTHY] = s->depthy;
     s->heighty[1] = s->heighty[2] = AV_CEIL_RSHIFT(inlink->h, vsub);
     s->heighty[0] = s->heighty[3] = inlink->h;
     s->widthy[1]  = s->widthy[2]  = AV_CEIL_RSHIFT(inlink->w, hsub);
     s->widthy[0]  = s->widthy[3]  = inlink->w;

     return 0;
 }

 #define DEFINE_LUT2(zname, xname, yname, ztype, xtype, ytype, zdiv, xdiv, ydiv)  \
 static int lut2_##zname##_##xname##_##yname(AVFilterContext *ctx,                \
                                              void *arg,                          \
                                              int jobnr, int nb_jobs)             \
 {                                                                                \
     LUT2Context *s = ctx->priv;                                                  \
     ThreadData *td = arg;                                                        \
     AVFrame *out = td->out;                                                      \
     AVFrame *srcx = td->srcx;                                                    \
     AVFrame *srcy = td->srcy;                                                    \
     const int odepth = s->odepth;                                                \
     int p, y, x;                                                                 \
                                                                                  \
     for (p = 0; p < s->nb_planes; p++) {                                         \
         const int slice_start = (s->heightx[p] * jobnr) / nb_jobs;               \
         const int slice_end = (s->heightx[p] * (jobnr+1)) / nb_jobs;             \
         const uint16_t *lut = s->lut[p];                                         \
         const xtype *srcxx;                                                      \
         const ytype *srcyy;                                                      \
         ztype *dst;                                                              \
                                                                                  \
         dst   = (ztype *)(out->data[p] + slice_start * out->linesize[p]);        \
         srcxx = (const xtype *)(srcx->data[p] + slice_start * srcx->linesize[p]);\
         srcyy = (const ytype *)(srcy->data[p] + slice_start * srcy->linesize[p]);\
                                                                                  \
         for (y = slice_start; y < slice_end; y++) {                              \
             for (x = 0; x < s->widthx[p]; x++) {                                 \
                 dst[x] = av_clip_uintp2_c(lut[(srcyy[x] << s->depthx) | srcxx[x]], odepth); \
             }                                                                    \
                                                                                  \
             dst   += out->linesize[p] / zdiv;                                    \
             srcxx += srcx->linesize[p] / xdiv;                                   \
             srcyy += srcy->linesize[p] / ydiv;                                   \
         }                                                                        \
     }                                                                            \
     return 0;                                                                    \
 }

 DEFINE_LUT2(8,   8,  8,  uint8_t,  uint8_t,  uint8_t, 1, 1, 1)
 DEFINE_LUT2(8,   8, 16,  uint8_t,  uint8_t, uint16_t, 1, 1, 2)
 DEFINE_LUT2(8,  16,  8,  uint8_t, uint16_t,  uint8_t, 1, 2, 1)
 DEFINE_LUT2(8,  16, 16,  uint8_t, uint16_t, uint16_t, 1, 2, 2)
 DEFINE_LUT2(16,  8,  8, uint16_t,  uint8_t,  uint8_t, 2, 1, 1)
 DEFINE_LUT2(16,  8, 16, uint16_t,  uint8_t, uint16_t, 2, 1, 2)
 DEFINE_LUT2(16, 16,  8, uint16_t, uint16_t,  uint8_t, 2, 2, 1)
 DEFINE_LUT2(16, 16, 16, uint16_t, uint16_t, uint16_t, 2, 2, 2)

 static int process_frame(FFFrameSync *fs)
 {
     AVFilterContext *ctx = fs->parent;
     LUT2Context *s = fs->opaque;
     AVFilterLink *outlink = ctx->outputs[0];
     AVFrame *out, *srcx = NULL, *srcy = NULL;
     int ret;

     if ((ret = ff_framesync_get_frame(&s->fs, 0, &srcx, 0)) < 0 ||
         (ret = ff_framesync_get_frame(&s->fs, 1, &srcy, 0)) < 0)
         return ret;

     if (ctx->is_disabled || !srcy) {
         out = av_frame_clone(srcx);
         if (!out)
             return AVERROR(ENOMEM);
     } else {
         ThreadData td;

         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
         if (!out)
             return AVERROR(ENOMEM);
         av_frame_copy_props(out, srcx);

         td.out  = out;
         td.srcx = srcx;
         td.srcy = srcy;
         ctx->internal->execute(ctx, s->lut2, &td, NULL, FFMIN(s->heightx[1], ff_filter_get_nb_threads(ctx)));
     }

     out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base);

     return ff_filter_frame(outlink, out);
 }

 static int config_output(AVFilterLink *outlink)
 {
     AVFilterContext *ctx = outlink->src;
     LUT2Context *s = ctx->priv;
     int p, ret;

     s->depth = s->depthx + s->depthy;
     s->nb_planes = s->nb_planesx;

     s->lut2 = s->depth > 16 ? lut2_16_16_16 : lut2_8_8_8;
     if (s->odepth) {
         if (s->depthx == 8 && s->depthy == 8 && s->odepth > 8)
             s->lut2 = lut2_16_8_8;
         if (s->depthx > 8 && s->depthy == 8 && s->odepth > 8)
             s->lut2 = lut2_16_16_8;
         if (s->depthx == 8 && s->depthy > 8 && s->odepth > 8)
             s->lut2 = lut2_16_8_16;
         if (s->depthx == 8 && s->depthy == 8 && s->odepth == 8)
             s->lut2 = lut2_8_8_8;
         if (s->depthx > 8 && s->depthy == 8 && s->odepth == 8)
             s->lut2 = lut2_8_16_8;
         if (s->depthx == 8 && s->depthy > 8 && s->odepth == 8)
             s->lut2 = lut2_8_8_16;
         if (s->depthx > 8 && s->depthy > 8 && s->odepth == 8)
             s->lut2 = lut2_8_16_16;
     } else {
         s->odepth = s->depthx;
     }

     for (p = 0; p < s->nb_planes; p++) {
         s->lut[p] = av_malloc_array(1 << s->depth, sizeof(uint16_t));
         if (!s->lut[p])
             return AVERROR(ENOMEM);
     }

     for (p = 0; p < s->nb_planes; p++) {
         double res;
         int x, y;

         /* create the parsed expression */
         av_expr_free(s->comp_expr[p]);
         s->comp_expr[p] = NULL;
         ret = av_expr_parse(&s->comp_expr[p], s->comp_expr_str[p],
                             var_names, NULL, NULL, NULL, NULL, 0, ctx);
         if (ret < 0) {
             av_log(ctx, AV_LOG_ERROR,
                    "Error when parsing the expression '%s' for the component %d.\n",
                    s->comp_expr_str[p], p);
             return AVERROR(EINVAL);
         }

         /* compute the lut */
         for (y = 0; y < (1 << s->depthy); y++) {
             s->var_values[VAR_Y] = y;
             for (x = 0; x < (1 << s->depthx); x++) {
                 s->var_values[VAR_X] = x;
                 res = av_expr_eval(s->comp_expr[p], s->var_values, s);
                 if (isnan(res)) {
                     av_log(ctx, AV_LOG_ERROR,
                            "Error when evaluating the expression '%s' for the values %d and %d for the component %d.\n",
                            s->comp_expr_str[p], x, y, p);
                     return AVERROR(EINVAL);
                 }

                 s->lut[p][(y << s->depthx) + x] = res;
             }
         }
     }

     return 0;
 }

 static int lut2_config_output(AVFilterLink *outlink)
 {
     AVFilterContext *ctx = outlink->src;
     LUT2Context *s = ctx->priv;
     AVFilterLink *srcx = ctx->inputs[0];
     AVFilterLink *srcy = ctx->inputs[1];
     FFFrameSyncIn *in;
     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
     int hsub = desc->log2_chroma_w;
     int vsub = desc->log2_chroma_h;
     int ret;

     outlink->w = srcx->w;
     outlink->h = srcx->h;
     outlink->time_base = srcx->time_base;
     outlink->sample_aspect_ratio = srcx->sample_aspect_ratio;
     outlink->frame_rate = srcx->frame_rate;

     s->nb_planes = av_pix_fmt_count_planes(outlink->format);
     s->height[1] = s->height[2] = AV_CEIL_RSHIFT(outlink->h, vsub);
     s->height[0] = s->height[3] = outlink->h;
     s->width[1]  = s->width[2]  = AV_CEIL_RSHIFT(outlink->w, hsub);
     s->width[0]  = s->width[3]  = outlink->w;

     if (!s->odepth && srcx->format != srcy->format) {
         av_log(ctx, AV_LOG_ERROR, "inputs must be of same pixel format\n");
         return AVERROR(EINVAL);
     }

     if (srcx->w != srcy->w || srcx->h != srcy->h) {
         av_log(ctx, AV_LOG_ERROR, "First input link %s parameters "
                "(size %dx%d) do not match the corresponding "
                "second input link %s parameters (size %dx%d)\n",
                ctx->input_pads[0].name, srcx->w, srcx->h,
                ctx->input_pads[1].name,
                srcy->w, srcy->h);
         return AVERROR(EINVAL);
     }

     if (s->nb_planesx != s->nb_planesy) {
         av_log(ctx, AV_LOG_ERROR, "First input link %s number of planes "
                "(%d) do not match the corresponding "
                "second input link %s number of planes (%d)\n",
                ctx->input_pads[0].name, s->nb_planesx,
                ctx->input_pads[1].name, s->nb_planesy);
         return AVERROR(EINVAL);
     }

     if (s->nb_planesx != s->nb_planes) {
         av_log(ctx, AV_LOG_ERROR, "First input link %s number of planes "
                "(%d) do not match the corresponding "
                "output link %s number of planes (%d)\n",
                ctx->input_pads[0].name, s->nb_planesx,
                ctx->output_pads[0].name, s->nb_planes);
         return AVERROR(EINVAL);
     }

     if (s->widthx[1] != s->widthy[1] || s->heightx[1] != s->heighty[1]) {
         av_log(ctx, AV_LOG_ERROR, "First input link %s 2nd plane "
                "(size %dx%d) do not match the corresponding "
                "second input link %s 2nd plane (size %dx%d)\n",
                ctx->input_pads[0].name, s->widthx[1], s->heightx[1],
                ctx->input_pads[1].name,
                s->widthy[1], s->heighty[1]);
         return AVERROR(EINVAL);
     }

     if (s->widthx[2] != s->widthy[2] || s->heightx[2] != s->heighty[2]) {
         av_log(ctx, AV_LOG_ERROR, "First input link %s 3rd plane "
                "(size %dx%d) do not match the corresponding "
                "second input link %s 3rd plane (size %dx%d)\n",
                ctx->input_pads[0].name, s->widthx[2], s->heightx[2],
                ctx->input_pads[1].name,
                s->widthy[2], s->heighty[2]);
         return AVERROR(EINVAL);
     }

     if (s->widthx[1] != s->width[1] || s->heightx[1] != s->height[1]) {
         av_log(ctx, AV_LOG_ERROR, "First input link %s 2nd plane "
                "(size %dx%d) do not match the corresponding "
                "output link %s 2nd plane (size %dx%d)\n",
                ctx->input_pads[0].name, s->widthx[1], s->heightx[1],
                ctx->output_pads[0].name, s->width[1], s->height[1]);
         return AVERROR(EINVAL);
     }

     if (s->widthx[2] != s->width[2] || s->heightx[2] != s->height[2]) {
         av_log(ctx, AV_LOG_ERROR, "First input link %s 3rd plane "
                "(size %dx%d) do not match the corresponding "
                "output link %s 3rd plane (size %dx%d)\n",
                ctx->input_pads[0].name, s->widthx[2], s->heightx[2],
                ctx->output_pads[0].name, s->width[2], s->height[2]);
         return AVERROR(EINVAL);
     }

     if ((ret = ff_framesync_init(&s->fs, ctx, 2)) < 0)
         return ret;

     in = s->fs.in;
     in[0].time_base = srcx->time_base;
     in[1].time_base = srcy->time_base;
     in[0].sync   = 2;
     in[0].before = EXT_STOP;
     in[0].after  = EXT_INFINITY;
     in[1].sync   = 1;
     in[1].before = EXT_STOP;
     in[1].after  = EXT_INFINITY;
     s->fs.opaque   = s;
     s->fs.on_event = process_frame;

     if ((ret = config_output(outlink)) < 0)
         return ret;

     ret = ff_framesync_configure(&s->fs);
     outlink->time_base = s->fs.time_base;

     return ret;
 }

 static int activate(AVFilterContext *ctx)
 {
     LUT2Context *s = ctx->priv;
     return ff_framesync_activate(&s->fs);
 }

 static const AVFilterPad inputs[] = {
     {
         .name         = "srcx",
         .type         = AVMEDIA_TYPE_VIDEO,
         .config_props = config_inputx,
     },
     {
         .name         = "srcy",
         .type         = AVMEDIA_TYPE_VIDEO,
         .config_props = config_inputy,
     },
     { NULL }
 };

 static const AVFilterPad outputs[] = {
     {
         .name          = "default",
         .type          = AVMEDIA_TYPE_VIDEO,
         .config_props  = lut2_config_output,
     },
     { NULL }
 };

 #define lut2_options options

 FRAMESYNC_DEFINE_CLASS(lut2, LUT2Context, fs);

 AVFilter ff_vf_lut2 = {
     .name          = "lut2",
     .description   = NULL_IF_CONFIG_SMALL("Compute and apply a lookup table from two video inputs."),
     .preinit       = lut2_framesync_preinit,
     .priv_size     = sizeof(LUT2Context),
     .priv_class    = &lut2_class,
     .uninit        = uninit,
     .query_formats = query_formats,
     .activate      = activate,
     .inputs        = inputs,
     .outputs       = outputs,
     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL |
                      AVFILTER_FLAG_SLICE_THREADS,
 };

 #if CONFIG_TLUT2_FILTER

 static av_cold int init(AVFilterContext *ctx)
 {
     LUT2Context *s = ctx->priv;

     s->tlut2 = !strcmp(ctx->filter->name, "tlut2");

     return 0;
 }

 static int tlut2_filter_frame(AVFilterLink *inlink, AVFrame *frame)
 {
     AVFilterContext *ctx = inlink->dst;
     LUT2Context *s = ctx->priv;
     AVFilterLink *outlink = ctx->outputs[0];

     if (s->prev_frame) {
         AVFrame *out;

         if (ctx->is_disabled) {
             out = av_frame_clone(frame);
         } else {
             ThreadData td;

             out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
             if (!out) {
                 av_frame_free(&s->prev_frame);
                 s->prev_frame = frame;
                 return AVERROR(ENOMEM);
             }

             av_frame_copy_props(out, frame);

             td.out  = out;
             td.srcx = frame;
             td.srcy = s->prev_frame;
             ctx->internal->execute(ctx, s->lut2, &td, NULL, FFMIN(s->heightx[1], ff_filter_get_nb_threads(ctx)));
         }
         av_frame_free(&s->prev_frame);
         s->prev_frame = frame;
         return ff_filter_frame(outlink, out);
     }
     s->prev_frame = frame;
     return 0;
 }

 static const AVOption tlut2_options[] = {
     { "c0", "set component #0 expression", OFFSET(comp_expr_str[0]),  AV_OPT_TYPE_STRING, { .str = "x" }, .flags = FLAGS },
     { "c1", "set component #1 expression", OFFSET(comp_expr_str[1]),  AV_OPT_TYPE_STRING, { .str = "x" }, .flags = FLAGS },
     { "c2", "set component #2 expression", OFFSET(comp_expr_str[2]),  AV_OPT_TYPE_STRING, { .str = "x" }, .flags = FLAGS },
     { "c3", "set component #3 expression", OFFSET(comp_expr_str[3]),  AV_OPT_TYPE_STRING, { .str = "x" }, .flags = FLAGS },
     { NULL }
 };

 AVFILTER_DEFINE_CLASS(tlut2);

 static const AVFilterPad tlut2_inputs[] = {
     {
         .name          = "default",
         .type          = AVMEDIA_TYPE_VIDEO,
         .filter_frame  = tlut2_filter_frame,
         .config_props  = config_inputx,
     },
     { NULL }
 };

 static const AVFilterPad tlut2_outputs[] = {
     {
         .name          = "default",
         .type          = AVMEDIA_TYPE_VIDEO,
         .config_props  = config_output,
     },
     { NULL }
 };

 AVFilter ff_vf_tlut2 = {
     .name          = "tlut2",
     .description   = NULL_IF_CONFIG_SMALL("Compute and apply a lookup table from two successive frames."),
     .priv_size     = sizeof(LUT2Context),
     .priv_class    = &tlut2_class,
     .query_formats = query_formats,
     .init          = init,
     .uninit        = uninit,
     .inputs        = tlut2_inputs,
     .outputs       = tlut2_outputs,
     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL |
                      AVFILTER_FLAG_SLICE_THREADS,
 };

 #endif
	/*
	* Copyright (c) 2016 Paul B Mahol
	*
	* This file is part of FFmpeg.
	*
	* FFmpeg is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; either
	* version 2.1 of the License, or (at your option) any later version.
	*
	* FFmpeg is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with FFmpeg; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	*/

	#include "libavutil/attributes.h"
	#include "libavutil/common.h"
	#include "libavutil/eval.h"
	#include "libavutil/opt.h"
	#include "libavutil/pixdesc.h"
	#include "avfilter.h"
	#include "drawutils.h"
	#include "formats.h"
	#include "internal.h"
	#include "video.h"
	#include "framesync.h"

	static const char *const var_names[] = {
	"w", ///< width of the input video
	"h", ///< height of the input video
	"x", ///< input value for the pixel from input #1
	"y", ///< input value for the pixel from input #2
	"bdx", ///< input #1 video bitdepth
	"bdy", ///< input #2 video bitdepth
	NULL
	};

	enum var_name {
	VAR_W,
	VAR_H,
	VAR_X,
	VAR_Y,
	VAR_BITDEPTHX,
	VAR_BITDEPTHY,
	VAR_VARS_NB
	};

	typedef struct LUT2Context {
	const AVClass *class;
	FFFrameSync fs;

	int odepth;
	char *comp_expr_str[4];

	AVExpr *comp_expr[4];
	double var_values[VAR_VARS_NB];
	uint16_t *lut[4]; ///< lookup table for each component
	int width[4], height[4];
	int widthx[4], heightx[4];
	int widthy[4], heighty[4];
	int nb_planesx;
	int nb_planesy;
	int nb_planes;
	int depth, depthx, depthy;
	int tlut2;
	AVFrame prev_frame; / only used with tlut2 */

	int (lut2)(AVFilterContext ctx, void *arg, int jobnr, int nb_jobs);
	} LUT2Context;

	typedef struct ThreadData {
	AVFrame out, srcx, *srcy;
	} ThreadData;

	#define OFFSET(x) offsetof(LUT2Context, x)
	#define FLAGS AV_OPT_FLAG_FILTERING_PARAM\|AV_OPT_FLAG_VIDEO_PARAM

	static const AVOption options[] = {
	{ "c0", "set component #0 expression", OFFSET(comp_expr_str[0]), AV_OPT_TYPE_STRING, { .str = "x" }, .flags = FLAGS },
	{ "c1", "set component #1 expression", OFFSET(comp_expr_str[1]), AV_OPT_TYPE_STRING, { .str = "x" }, .flags = FLAGS },
	{ "c2", "set component #2 expression", OFFSET(comp_expr_str[2]), AV_OPT_TYPE_STRING, { .str = "x" }, .flags = FLAGS },
	{ "c3", "set component #3 expression", OFFSET(comp_expr_str[3]), AV_OPT_TYPE_STRING, { .str = "x" }, .flags = FLAGS },
	{ "d", "set output depth", OFFSET(odepth), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 16, .flags = FLAGS },
	{ NULL }
	};

	static av_cold void uninit(AVFilterContext *ctx)
	{
	LUT2Context *s = ctx->priv;
	int i;

	ff_framesync_uninit(&s->fs);
	av_frame_free(&s->prev_frame);

	for (i = 0; i < 4; i++) {
	av_expr_free(s->comp_expr[i]);
	s->comp_expr[i] = NULL;
	av_freep(&s->comp_expr_str[i]);
	av_freep(&s->lut[i]);
	}
	}

	#define BIT8_FMTS \
	AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P, \
	AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, \
	AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P, \
	AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P, \
	AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, \
	AV_PIX_FMT_GRAY8, AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,

	#define BIT9_FMTS \
	AV_PIX_FMT_GBRP9, AV_PIX_FMT_GRAY9, \
	AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9, \
	AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,

	#define BIT10_FMTS \
	AV_PIX_FMT_GRAY10, AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRAP10, \
	AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10, \
	AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,

	#define BIT12_FMTS \
	AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV440P12, \
	AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12, \
	AV_PIX_FMT_GRAY12, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRP12,

	#define BIT14_FMTS \
	AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14, \
	AV_PIX_FMT_GRAY14, AV_PIX_FMT_GBRP14,

	#define BIT16_FMTS \
	AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16, \
	AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16, \
	AV_PIX_FMT_GBRP16, AV_PIX_FMT_GBRAP16, AV_PIX_FMT_GRAY16,

	static int query_formats(AVFilterContext *ctx)
	{
	LUT2Context *s = ctx->priv;
	static const enum AVPixelFormat all_pix_fmts[] = {
	BIT8_FMTS
	BIT9_FMTS
	BIT10_FMTS
	BIT12_FMTS
	AV_PIX_FMT_NONE
	};
	static const enum AVPixelFormat bit8_pix_fmts[] = {
	BIT8_FMTS
	AV_PIX_FMT_NONE
	};
	static const enum AVPixelFormat bit9_pix_fmts[] = {
	BIT9_FMTS
	AV_PIX_FMT_NONE
	};
	static const enum AVPixelFormat bit10_pix_fmts[] = {
	BIT10_FMTS
	AV_PIX_FMT_NONE
	};
	static const enum AVPixelFormat bit12_pix_fmts[] = {
	BIT12_FMTS
	AV_PIX_FMT_NONE
	};
	static const enum AVPixelFormat bit14_pix_fmts[] = {
	BIT14_FMTS
	AV_PIX_FMT_NONE
	};
	static const enum AVPixelFormat bit16_pix_fmts[] = {
	BIT16_FMTS
	AV_PIX_FMT_NONE
	};
	const enum AVPixelFormat *pix_fmts;
	int ret;

	if (s->tlut2 \|\| !s->odepth)
	return ff_set_common_formats(ctx, ff_make_format_list(all_pix_fmts));

	ret = ff_formats_ref(ff_make_format_list(all_pix_fmts), &ctx->inputs[0]->outcfg.formats);
	if (ret < 0)
	return ret;

	switch (s->odepth) {
	case 8: pix_fmts = bit8_pix_fmts; break;
	case 9: pix_fmts = bit9_pix_fmts; break;
	case 10: pix_fmts = bit10_pix_fmts; break;
	case 12: pix_fmts = bit12_pix_fmts; break;
	case 14: pix_fmts = bit14_pix_fmts; break;
	case 16: pix_fmts = bit16_pix_fmts; break;
	default: av_log(ctx, AV_LOG_ERROR, "Unsupported output bit depth %d.\n", s->odepth);
	return AVERROR(EINVAL);
	}

	return ff_formats_ref(ff_make_format_list(pix_fmts), &ctx->outputs[0]->incfg.formats);
	}

	static int config_inputx(AVFilterLink *inlink)
	{
	AVFilterContext *ctx = inlink->dst;
	LUT2Context *s = ctx->priv;
	const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
	int hsub = desc->log2_chroma_w;
	int vsub = desc->log2_chroma_h;

	s->nb_planesx = av_pix_fmt_count_planes(inlink->format);
	s->heightx[1] = s->heightx[2] = AV_CEIL_RSHIFT(inlink->h, vsub);
	s->heightx[0] = s->heightx[3] = inlink->h;
	s->widthx[1] = s->widthx[2] = AV_CEIL_RSHIFT(inlink->w, hsub);
	s->widthx[0] = s->widthx[3] = inlink->w;

	s->var_values[VAR_W] = inlink->w;
	s->var_values[VAR_H] = inlink->h;
	s->depthx = desc->comp[0].depth;
	s->var_values[VAR_BITDEPTHX] = s->depthx;

	if (s->tlut2) {
	s->depthy = desc->comp[0].depth;
	s->var_values[VAR_BITDEPTHY] = s->depthy;
	}

	return 0;
	}

	static int config_inputy(AVFilterLink *inlink)
	{
	AVFilterContext *ctx = inlink->dst;
	LUT2Context *s = ctx->priv;
	const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
	int hsub = desc->log2_chroma_w;
	int vsub = desc->log2_chroma_h;

	s->nb_planesy = av_pix_fmt_count_planes(inlink->format);
	s->depthy = desc->comp[0].depth;
	s->var_values[VAR_BITDEPTHY] = s->depthy;
	s->heighty[1] = s->heighty[2] = AV_CEIL_RSHIFT(inlink->h, vsub);
	s->heighty[0] = s->heighty[3] = inlink->h;
	s->widthy[1] = s->widthy[2] = AV_CEIL_RSHIFT(inlink->w, hsub);
	s->widthy[0] = s->widthy[3] = inlink->w;

	return 0;
	}

	#define DEFINE_LUT2(zname, xname, yname, ztype, xtype, ytype, zdiv, xdiv, ydiv) \
	static int lut2_##zname##_##xname##_##yname(AVFilterContext *ctx, \
	void *arg, \
	int jobnr, int nb_jobs) \
	{ \
	LUT2Context *s = ctx->priv; \
	ThreadData *td = arg; \
	AVFrame *out = td->out; \
	AVFrame *srcx = td->srcx; \
	AVFrame *srcy = td->srcy; \
	const int odepth = s->odepth; \
	int p, y, x; \
	\
	for (p = 0; p < s->nb_planes; p++) { \
	const int slice_start = (s->heightx[p] * jobnr) / nb_jobs; \
	const int slice_end = (s->heightx[p] * (jobnr+1)) / nb_jobs; \
	const uint16_t *lut = s->lut[p]; \
	const xtype *srcxx; \
	const ytype *srcyy; \
	ztype *dst; \
	\
	dst = (ztype )(out->data[p] + slice_start out->linesize[p]); \
	srcxx = (const xtype )(srcx->data[p] + slice_start srcx->linesize[p]);\
	srcyy = (const ytype )(srcy->data[p] + slice_start srcy->linesize[p]);\
	\
	for (y = slice_start; y < slice_end; y++) { \
	for (x = 0; x < s->widthx[p]; x++) { \
	dst[x] = av_clip_uintp2_c(lut[(srcyy[x] << s->depthx) \| srcxx[x]], odepth); \
	} \
	\
	dst += out->linesize[p] / zdiv; \
	srcxx += srcx->linesize[p] / xdiv; \
	srcyy += srcy->linesize[p] / ydiv; \
	} \
	} \
	return 0; \
	}

	DEFINE_LUT2(8, 8, 8, uint8_t, uint8_t, uint8_t, 1, 1, 1)
	DEFINE_LUT2(8, 8, 16, uint8_t, uint8_t, uint16_t, 1, 1, 2)
	DEFINE_LUT2(8, 16, 8, uint8_t, uint16_t, uint8_t, 1, 2, 1)
	DEFINE_LUT2(8, 16, 16, uint8_t, uint16_t, uint16_t, 1, 2, 2)
	DEFINE_LUT2(16, 8, 8, uint16_t, uint8_t, uint8_t, 2, 1, 1)
	DEFINE_LUT2(16, 8, 16, uint16_t, uint8_t, uint16_t, 2, 1, 2)
	DEFINE_LUT2(16, 16, 8, uint16_t, uint16_t, uint8_t, 2, 2, 1)
	DEFINE_LUT2(16, 16, 16, uint16_t, uint16_t, uint16_t, 2, 2, 2)

	static int process_frame(FFFrameSync *fs)
	{
	AVFilterContext *ctx = fs->parent;
	LUT2Context *s = fs->opaque;
	AVFilterLink *outlink = ctx->outputs[0];
	AVFrame out, srcx = NULL, *srcy = NULL;
	int ret;

	if ((ret = ff_framesync_get_frame(&s->fs, 0, &srcx, 0)) < 0 \|\|
	(ret = ff_framesync_get_frame(&s->fs, 1, &srcy, 0)) < 0)
	return ret;

	if (ctx->is_disabled \|\| !srcy) {
	out = av_frame_clone(srcx);
	if (!out)
	return AVERROR(ENOMEM);
	} else {
	ThreadData td;

	out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
	if (!out)
	return AVERROR(ENOMEM);
	av_frame_copy_props(out, srcx);

	td.out = out;
	td.srcx = srcx;
	td.srcy = srcy;
	ctx->internal->execute(ctx, s->lut2, &td, NULL, FFMIN(s->heightx[1], ff_filter_get_nb_threads(ctx)));
	}

	out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base);

	return ff_filter_frame(outlink, out);
	}

	static int config_output(AVFilterLink *outlink)
	{
	AVFilterContext *ctx = outlink->src;
	LUT2Context *s = ctx->priv;
	int p, ret;

	s->depth = s->depthx + s->depthy;
	s->nb_planes = s->nb_planesx;

	s->lut2 = s->depth > 16 ? lut2_16_16_16 : lut2_8_8_8;
	if (s->odepth) {
	if (s->depthx == 8 && s->depthy == 8 && s->odepth > 8)
	s->lut2 = lut2_16_8_8;
	if (s->depthx > 8 && s->depthy == 8 && s->odepth > 8)
	s->lut2 = lut2_16_16_8;
	if (s->depthx == 8 && s->depthy > 8 && s->odepth > 8)
	s->lut2 = lut2_16_8_16;
	if (s->depthx == 8 && s->depthy == 8 && s->odepth == 8)
	s->lut2 = lut2_8_8_8;
	if (s->depthx > 8 && s->depthy == 8 && s->odepth == 8)
	s->lut2 = lut2_8_16_8;
	if (s->depthx == 8 && s->depthy > 8 && s->odepth == 8)
	s->lut2 = lut2_8_8_16;
	if (s->depthx > 8 && s->depthy > 8 && s->odepth == 8)
	s->lut2 = lut2_8_16_16;
	} else {
	s->odepth = s->depthx;
	}

	for (p = 0; p < s->nb_planes; p++) {
	s->lut[p] = av_malloc_array(1 << s->depth, sizeof(uint16_t));
	if (!s->lut[p])
	return AVERROR(ENOMEM);
	}

	for (p = 0; p < s->nb_planes; p++) {
	double res;
	int x, y;

	/* create the parsed expression */
	av_expr_free(s->comp_expr[p]);
	s->comp_expr[p] = NULL;
	ret = av_expr_parse(&s->comp_expr[p], s->comp_expr_str[p],
	var_names, NULL, NULL, NULL, NULL, 0, ctx);
	if (ret < 0) {
	av_log(ctx, AV_LOG_ERROR,
	"Error when parsing the expression '%s' for the component %d.\n",
	s->comp_expr_str[p], p);
	return AVERROR(EINVAL);
	}

	/* compute the lut */
	for (y = 0; y < (1 << s->depthy); y++) {
	s->var_values[VAR_Y] = y;
	for (x = 0; x < (1 << s->depthx); x++) {
	s->var_values[VAR_X] = x;
	res = av_expr_eval(s->comp_expr[p], s->var_values, s);
	if (isnan(res)) {
	av_log(ctx, AV_LOG_ERROR,
	"Error when evaluating the expression '%s' for the values %d and %d for the component %d.\n",
	s->comp_expr_str[p], x, y, p);
	return AVERROR(EINVAL);
	}

	s->lut[p][(y << s->depthx) + x] = res;
	}
	}
	}

	return 0;
	}

	static int lut2_config_output(AVFilterLink *outlink)
	{
	AVFilterContext *ctx = outlink->src;
	LUT2Context *s = ctx->priv;
	AVFilterLink *srcx = ctx->inputs[0];
	AVFilterLink *srcy = ctx->inputs[1];
	FFFrameSyncIn *in;
	const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
	int hsub = desc->log2_chroma_w;
	int vsub = desc->log2_chroma_h;
	int ret;

	outlink->w = srcx->w;
	outlink->h = srcx->h;
	outlink->time_base = srcx->time_base;
	outlink->sample_aspect_ratio = srcx->sample_aspect_ratio;
	outlink->frame_rate = srcx->frame_rate;

	s->nb_planes = av_pix_fmt_count_planes(outlink->format);
	s->height[1] = s->height[2] = AV_CEIL_RSHIFT(outlink->h, vsub);
	s->height[0] = s->height[3] = outlink->h;
	s->width[1] = s->width[2] = AV_CEIL_RSHIFT(outlink->w, hsub);
	s->width[0] = s->width[3] = outlink->w;

	if (!s->odepth && srcx->format != srcy->format) {
	av_log(ctx, AV_LOG_ERROR, "inputs must be of same pixel format\n");
	return AVERROR(EINVAL);
	}

	if (srcx->w != srcy->w \|\| srcx->h != srcy->h) {
	av_log(ctx, AV_LOG_ERROR, "First input link %s parameters "
	"(size %dx%d) do not match the corresponding "
	"second input link %s parameters (size %dx%d)\n",
	ctx->input_pads[0].name, srcx->w, srcx->h,
	ctx->input_pads[1].name,
	srcy->w, srcy->h);
	return AVERROR(EINVAL);
	}

	if (s->nb_planesx != s->nb_planesy) {
	av_log(ctx, AV_LOG_ERROR, "First input link %s number of planes "
	"(%d) do not match the corresponding "
	"second input link %s number of planes (%d)\n",
	ctx->input_pads[0].name, s->nb_planesx,
	ctx->input_pads[1].name, s->nb_planesy);
	return AVERROR(EINVAL);
	}

	if (s->nb_planesx != s->nb_planes) {
	av_log(ctx, AV_LOG_ERROR, "First input link %s number of planes "
	"(%d) do not match the corresponding "
	"output link %s number of planes (%d)\n",
	ctx->input_pads[0].name, s->nb_planesx,
	ctx->output_pads[0].name, s->nb_planes);
	return AVERROR(EINVAL);
	}

	if (s->widthx[1] != s->widthy[1] \|\| s->heightx[1] != s->heighty[1]) {
	av_log(ctx, AV_LOG_ERROR, "First input link %s 2nd plane "
	"(size %dx%d) do not match the corresponding "
	"second input link %s 2nd plane (size %dx%d)\n",
	ctx->input_pads[0].name, s->widthx[1], s->heightx[1],
	ctx->input_pads[1].name,
	s->widthy[1], s->heighty[1]);
	return AVERROR(EINVAL);
	}

	if (s->widthx[2] != s->widthy[2] \|\| s->heightx[2] != s->heighty[2]) {
	av_log(ctx, AV_LOG_ERROR, "First input link %s 3rd plane "
	"(size %dx%d) do not match the corresponding "
	"second input link %s 3rd plane (size %dx%d)\n",
	ctx->input_pads[0].name, s->widthx[2], s->heightx[2],
	ctx->input_pads[1].name,
	s->widthy[2], s->heighty[2]);
	return AVERROR(EINVAL);
	}

	if (s->widthx[1] != s->width[1] \|\| s->heightx[1] != s->height[1]) {
	av_log(ctx, AV_LOG_ERROR, "First input link %s 2nd plane "
	"(size %dx%d) do not match the corresponding "
	"output link %s 2nd plane (size %dx%d)\n",
	ctx->input_pads[0].name, s->widthx[1], s->heightx[1],
	ctx->output_pads[0].name, s->width[1], s->height[1]);
	return AVERROR(EINVAL);
	}

	if (s->widthx[2] != s->width[2] \|\| s->heightx[2] != s->height[2]) {
	av_log(ctx, AV_LOG_ERROR, "First input link %s 3rd plane "
	"(size %dx%d) do not match the corresponding "
	"output link %s 3rd plane (size %dx%d)\n",
	ctx->input_pads[0].name, s->widthx[2], s->heightx[2],
	ctx->output_pads[0].name, s->width[2], s->height[2]);
	return AVERROR(EINVAL);
	}

	if ((ret = ff_framesync_init(&s->fs, ctx, 2)) < 0)
	return ret;

	in = s->fs.in;
	in[0].time_base = srcx->time_base;
	in[1].time_base = srcy->time_base;
	in[0].sync = 2;
	in[0].before = EXT_STOP;
	in[0].after = EXT_INFINITY;
	in[1].sync = 1;
	in[1].before = EXT_STOP;
	in[1].after = EXT_INFINITY;
	s->fs.opaque = s;
	s->fs.on_event = process_frame;

	if ((ret = config_output(outlink)) < 0)
	return ret;

	ret = ff_framesync_configure(&s->fs);
	outlink->time_base = s->fs.time_base;

	return ret;
	}

	static int activate(AVFilterContext *ctx)
	{
	LUT2Context *s = ctx->priv;
	return ff_framesync_activate(&s->fs);
	}

	static const AVFilterPad inputs[] = {
	{
	.name = "srcx",
	.type = AVMEDIA_TYPE_VIDEO,
	.config_props = config_inputx,
	},
	{
	.name = "srcy",
	.type = AVMEDIA_TYPE_VIDEO,
	.config_props = config_inputy,
	},
	{ NULL }
	};

	static const AVFilterPad outputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_VIDEO,
	.config_props = lut2_config_output,
	},
	{ NULL }
	};

	#define lut2_options options

	FRAMESYNC_DEFINE_CLASS(lut2, LUT2Context, fs);

	AVFilter ff_vf_lut2 = {
	.name = "lut2",
	.description = NULL_IF_CONFIG_SMALL("Compute and apply a lookup table from two video inputs."),
	.preinit = lut2_framesync_preinit,
	.priv_size = sizeof(LUT2Context),
	.priv_class = &lut2_class,
	.uninit = uninit,
	.query_formats = query_formats,
	.activate = activate,
	.inputs = inputs,
	.outputs = outputs,
	.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL \|
	AVFILTER_FLAG_SLICE_THREADS,
	};

	#if CONFIG_TLUT2_FILTER

	static av_cold int init(AVFilterContext *ctx)
	{
	LUT2Context *s = ctx->priv;

	s->tlut2 = !strcmp(ctx->filter->name, "tlut2");

	return 0;
	}

	static int tlut2_filter_frame(AVFilterLink inlink, AVFrame frame)
	{
	AVFilterContext *ctx = inlink->dst;
	LUT2Context *s = ctx->priv;
	AVFilterLink *outlink = ctx->outputs[0];

	if (s->prev_frame) {
	AVFrame *out;

	if (ctx->is_disabled) {
	out = av_frame_clone(frame);
	} else {
	ThreadData td;

	out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
	if (!out) {
	av_frame_free(&s->prev_frame);
	s->prev_frame = frame;
	return AVERROR(ENOMEM);
	}

	av_frame_copy_props(out, frame);

	td.out = out;
	td.srcx = frame;
	td.srcy = s->prev_frame;
	ctx->internal->execute(ctx, s->lut2, &td, NULL, FFMIN(s->heightx[1], ff_filter_get_nb_threads(ctx)));
	}
	av_frame_free(&s->prev_frame);
	s->prev_frame = frame;
	return ff_filter_frame(outlink, out);
	}
	s->prev_frame = frame;
	return 0;
	}

	static const AVOption tlut2_options[] = {
	{ "c0", "set component #0 expression", OFFSET(comp_expr_str[0]), AV_OPT_TYPE_STRING, { .str = "x" }, .flags = FLAGS },
	{ "c1", "set component #1 expression", OFFSET(comp_expr_str[1]), AV_OPT_TYPE_STRING, { .str = "x" }, .flags = FLAGS },
	{ "c2", "set component #2 expression", OFFSET(comp_expr_str[2]), AV_OPT_TYPE_STRING, { .str = "x" }, .flags = FLAGS },
	{ "c3", "set component #3 expression", OFFSET(comp_expr_str[3]), AV_OPT_TYPE_STRING, { .str = "x" }, .flags = FLAGS },
	{ NULL }
	};

	AVFILTER_DEFINE_CLASS(tlut2);

	static const AVFilterPad tlut2_inputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_VIDEO,
	.filter_frame = tlut2_filter_frame,
	.config_props = config_inputx,
	},
	{ NULL }
	};

	static const AVFilterPad tlut2_outputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_VIDEO,
	.config_props = config_output,
	},
	{ NULL }
	};

	AVFilter ff_vf_tlut2 = {
	.name = "tlut2",
	.description = NULL_IF_CONFIG_SMALL("Compute and apply a lookup table from two successive frames."),
	.priv_size = sizeof(LUT2Context),
	.priv_class = &tlut2_class,
	.query_formats = query_formats,
	.init = init,
	.uninit = uninit,
	.inputs = tlut2_inputs,
	.outputs = tlut2_outputs,
	.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL \|
	AVFILTER_FLAG_SLICE_THREADS,
	};

	#endif