yading@10: /*
yading@10:  * Copyright (c) 2011 Stefano Sabatini
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * Compute a look-up table for binding the input value to the output
yading@10:  * value, and apply it to input video.
yading@10:  */
yading@10: 
yading@10: #include "libavutil/common.h"
yading@10: #include "libavutil/eval.h"
yading@10: #include "libavutil/opt.h"
yading@10: #include "libavutil/pixdesc.h"
yading@10: #include "avfilter.h"
yading@10: #include "drawutils.h"
yading@10: #include "formats.h"
yading@10: #include "internal.h"
yading@10: #include "video.h"
yading@10: 
yading@10: static const char *const var_names[] = {
yading@10:     "w",        ///< width of the input video
yading@10:     "h",        ///< height of the input video
yading@10:     "val",      ///< input value for the pixel
yading@10:     "maxval",   ///< max value for the pixel
yading@10:     "minval",   ///< min value for the pixel
yading@10:     "negval",   ///< negated value
yading@10:     "clipval",
yading@10:     NULL
yading@10: };
yading@10: 
yading@10: enum var_name {
yading@10:     VAR_W,
yading@10:     VAR_H,
yading@10:     VAR_VAL,
yading@10:     VAR_MAXVAL,
yading@10:     VAR_MINVAL,
yading@10:     VAR_NEGVAL,
yading@10:     VAR_CLIPVAL,
yading@10:     VAR_VARS_NB
yading@10: };
yading@10: 
yading@10: typedef struct {
yading@10:     const AVClass *class;
yading@10:     uint8_t lut[4][256];  ///< lookup table for each component
yading@10:     char   *comp_expr_str[4];
yading@10:     AVExpr *comp_expr[4];
yading@10:     int hsub, vsub;
yading@10:     double var_values[VAR_VARS_NB];
yading@10:     int is_rgb, is_yuv;
yading@10:     int step;
yading@10:     int negate_alpha; /* only used by negate */
yading@10: } LutContext;
yading@10: 
yading@10: #define Y 0
yading@10: #define U 1
yading@10: #define V 2
yading@10: #define R 0
yading@10: #define G 1
yading@10: #define B 2
yading@10: #define A 3
yading@10: 
yading@10: #define OFFSET(x) offsetof(LutContext, x)
yading@10: #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
yading@10: 
yading@10: static const AVOption options[] = {
yading@10:     { "c0", "set component #0 expression", OFFSET(comp_expr_str[0]),  AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
yading@10:     { "c1", "set component #1 expression", OFFSET(comp_expr_str[1]),  AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
yading@10:     { "c2", "set component #2 expression", OFFSET(comp_expr_str[2]),  AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
yading@10:     { "c3", "set component #3 expression", OFFSET(comp_expr_str[3]),  AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
yading@10:     { "y",  "set Y expression",            OFFSET(comp_expr_str[Y]),  AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
yading@10:     { "u",  "set U expression",            OFFSET(comp_expr_str[U]),  AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
yading@10:     { "v",  "set V expression",            OFFSET(comp_expr_str[V]),  AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
yading@10:     { "r",  "set R expression",            OFFSET(comp_expr_str[R]),  AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
yading@10:     { "g",  "set G expression",            OFFSET(comp_expr_str[G]),  AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
yading@10:     { "b",  "set B expression",            OFFSET(comp_expr_str[B]),  AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
yading@10:     { "a",  "set A expression",            OFFSET(comp_expr_str[A]),  AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },
yading@10:     { NULL },
yading@10: };
yading@10: 
yading@10: static av_cold void uninit(AVFilterContext *ctx)
yading@10: {
yading@10:     LutContext *lut = ctx->priv;
yading@10:     int i;
yading@10: 
yading@10:     for (i = 0; i < 4; i++) {
yading@10:         av_expr_free(lut->comp_expr[i]);
yading@10:         lut->comp_expr[i] = NULL;
yading@10:         av_freep(&lut->comp_expr_str[i]);
yading@10:     }
yading@10: }
yading@10: 
yading@10: #define YUV_FORMATS                                         \
yading@10:     AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV420P,    \
yading@10:     AV_PIX_FMT_YUV411P,  AV_PIX_FMT_YUV410P,  AV_PIX_FMT_YUV440P,    \
yading@10:     AV_PIX_FMT_YUVA420P,                                       \
yading@10:     AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,   \
yading@10:     AV_PIX_FMT_YUVJ440P
yading@10: 
yading@10: #define RGB_FORMATS                             \
yading@10:     AV_PIX_FMT_ARGB,         AV_PIX_FMT_RGBA,         \
yading@10:     AV_PIX_FMT_ABGR,         AV_PIX_FMT_BGRA,         \
yading@10:     AV_PIX_FMT_RGB24,        AV_PIX_FMT_BGR24
yading@10: 
yading@10: static const enum AVPixelFormat yuv_pix_fmts[] = { YUV_FORMATS, AV_PIX_FMT_NONE };
yading@10: static const enum AVPixelFormat rgb_pix_fmts[] = { RGB_FORMATS, AV_PIX_FMT_NONE };
yading@10: static const enum AVPixelFormat all_pix_fmts[] = { RGB_FORMATS, YUV_FORMATS, AV_PIX_FMT_NONE };
yading@10: 
yading@10: static int query_formats(AVFilterContext *ctx)
yading@10: {
yading@10:     LutContext *lut = ctx->priv;
yading@10: 
yading@10:     const enum AVPixelFormat *pix_fmts = lut->is_rgb ? rgb_pix_fmts :
yading@10:                                        lut->is_yuv ? yuv_pix_fmts : all_pix_fmts;
yading@10: 
yading@10:     ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * Clip value val in the minval - maxval range.
yading@10:  */
yading@10: static double clip(void *opaque, double val)
yading@10: {
yading@10:     LutContext *lut = opaque;
yading@10:     double minval = lut->var_values[VAR_MINVAL];
yading@10:     double maxval = lut->var_values[VAR_MAXVAL];
yading@10: 
yading@10:     return av_clip(val, minval, maxval);
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * Compute gamma correction for value val, assuming the minval-maxval
yading@10:  * range, val is clipped to a value contained in the same interval.
yading@10:  */
yading@10: static double compute_gammaval(void *opaque, double gamma)
yading@10: {
yading@10:     LutContext *lut = opaque;
yading@10:     double val    = lut->var_values[VAR_CLIPVAL];
yading@10:     double minval = lut->var_values[VAR_MINVAL];
yading@10:     double maxval = lut->var_values[VAR_MAXVAL];
yading@10: 
yading@10:     return pow((val-minval)/(maxval-minval), gamma) * (maxval-minval)+minval;
yading@10: }
yading@10: 
yading@10: static double (* const funcs1[])(void *, double) = {
yading@10:     (void *)clip,
yading@10:     (void *)compute_gammaval,
yading@10:     NULL
yading@10: };
yading@10: 
yading@10: static const char * const funcs1_names[] = {
yading@10:     "clip",
yading@10:     "gammaval",
yading@10:     NULL
yading@10: };
yading@10: 
yading@10: static int config_props(AVFilterLink *inlink)
yading@10: {
yading@10:     AVFilterContext *ctx = inlink->dst;
yading@10:     LutContext *lut = ctx->priv;
yading@10:     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
yading@10:     uint8_t rgba_map[4]; /* component index -> RGBA color index map */
yading@10:     int min[4], max[4];
yading@10:     int val, color, ret;
yading@10: 
yading@10:     lut->hsub = desc->log2_chroma_w;
yading@10:     lut->vsub = desc->log2_chroma_h;
yading@10: 
yading@10:     lut->var_values[VAR_W] = inlink->w;
yading@10:     lut->var_values[VAR_H] = inlink->h;
yading@10: 
yading@10:     switch (inlink->format) {
yading@10:     case AV_PIX_FMT_YUV410P:
yading@10:     case AV_PIX_FMT_YUV411P:
yading@10:     case AV_PIX_FMT_YUV420P:
yading@10:     case AV_PIX_FMT_YUV422P:
yading@10:     case AV_PIX_FMT_YUV440P:
yading@10:     case AV_PIX_FMT_YUV444P:
yading@10:     case AV_PIX_FMT_YUVA420P:
yading@10:         min[Y] = min[U] = min[V] = 16;
yading@10:         max[Y] = 235;
yading@10:         max[U] = max[V] = 240;
yading@10:         min[A] = 0; max[A] = 255;
yading@10:         break;
yading@10:     default:
yading@10:         min[0] = min[1] = min[2] = min[3] = 0;
yading@10:         max[0] = max[1] = max[2] = max[3] = 255;
yading@10:     }
yading@10: 
yading@10:     lut->is_yuv = lut->is_rgb = 0;
yading@10:     if      (ff_fmt_is_in(inlink->format, yuv_pix_fmts)) lut->is_yuv = 1;
yading@10:     else if (ff_fmt_is_in(inlink->format, rgb_pix_fmts)) lut->is_rgb = 1;
yading@10: 
yading@10:     if (lut->is_rgb) {
yading@10:         ff_fill_rgba_map(rgba_map, inlink->format);
yading@10:         lut->step = av_get_bits_per_pixel(desc) >> 3;
yading@10:     }
yading@10: 
yading@10:     for (color = 0; color < desc->nb_components; color++) {
yading@10:         double res;
yading@10:         int comp = lut->is_rgb ? rgba_map[color] : color;
yading@10: 
yading@10:         /* create the parsed expression */
yading@10:         ret = av_expr_parse(&lut->comp_expr[color], lut->comp_expr_str[color],
yading@10:                             var_names, funcs1_names, funcs1, NULL, NULL, 0, ctx);
yading@10:         if (ret < 0) {
yading@10:             av_log(ctx, AV_LOG_ERROR,
yading@10:                    "Error when parsing the expression '%s' for the component %d and color %d.\n",
yading@10:                    lut->comp_expr_str[comp], comp, color);
yading@10:             return AVERROR(EINVAL);
yading@10:         }
yading@10: 
yading@10:         /* compute the lut */
yading@10:         lut->var_values[VAR_MAXVAL] = max[color];
yading@10:         lut->var_values[VAR_MINVAL] = min[color];
yading@10: 
yading@10:         for (val = 0; val < 256; val++) {
yading@10:             lut->var_values[VAR_VAL] = val;
yading@10:             lut->var_values[VAR_CLIPVAL] = av_clip(val, min[color], max[color]);
yading@10:             lut->var_values[VAR_NEGVAL] =
yading@10:                 av_clip(min[color] + max[color] - lut->var_values[VAR_VAL],
yading@10:                         min[color], max[color]);
yading@10: 
yading@10:             res = av_expr_eval(lut->comp_expr[color], lut->var_values, lut);
yading@10:             if (isnan(res)) {
yading@10:                 av_log(ctx, AV_LOG_ERROR,
yading@10:                        "Error when evaluating the expression '%s' for the value %d for the component %d.\n",
yading@10:                        lut->comp_expr_str[color], val, comp);
yading@10:                 return AVERROR(EINVAL);
yading@10:             }
yading@10:             lut->lut[comp][val] = av_clip((int)res, min[color], max[color]);
yading@10:             av_log(ctx, AV_LOG_DEBUG, "val[%d][%d] = %d\n", comp, val, lut->lut[comp][val]);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int filter_frame(AVFilterLink *inlink, AVFrame *in)
yading@10: {
yading@10:     AVFilterContext *ctx = inlink->dst;
yading@10:     LutContext *lut = ctx->priv;
yading@10:     AVFilterLink *outlink = ctx->outputs[0];
yading@10:     AVFrame *out;
yading@10:     uint8_t *inrow, *outrow, *inrow0, *outrow0;
yading@10:     int i, j, plane, direct = 0;
yading@10: 
yading@10:     if (av_frame_is_writable(in)) {
yading@10:         direct = 1;
yading@10:         out = in;
yading@10:     } else {
yading@10:         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
yading@10:         if (!out) {
yading@10:             av_frame_free(&in);
yading@10:             return AVERROR(ENOMEM);
yading@10:         }
yading@10:         av_frame_copy_props(out, in);
yading@10:     }
yading@10: 
yading@10:     if (lut->is_rgb) {
yading@10:         /* packed */
yading@10:         inrow0  = in ->data[0];
yading@10:         outrow0 = out->data[0];
yading@10: 
yading@10:         for (i = 0; i < in->height; i ++) {
yading@10:             int w = inlink->w;
yading@10:             const uint8_t (*tab)[256] = (const uint8_t (*)[256])lut->lut;
yading@10:             inrow  = inrow0;
yading@10:             outrow = outrow0;
yading@10:             for (j = 0; j < w; j++) {
yading@10:                 switch (lut->step) {
yading@10:                 case 4:  outrow[3] = tab[3][inrow[3]]; // Fall-through
yading@10:                 case 3:  outrow[2] = tab[2][inrow[2]]; // Fall-through
yading@10:                 case 2:  outrow[1] = tab[1][inrow[1]]; // Fall-through
yading@10:                 default: outrow[0] = tab[0][inrow[0]];
yading@10:                 }
yading@10:                 outrow += lut->step;
yading@10:                 inrow  += lut->step;
yading@10:             }
yading@10:             inrow0  += in ->linesize[0];
yading@10:             outrow0 += out->linesize[0];
yading@10:         }
yading@10:     } else {
yading@10:         /* planar */
yading@10:         for (plane = 0; plane < 4 && in->data[plane]; plane++) {
yading@10:             int vsub = plane == 1 || plane == 2 ? lut->vsub : 0;
yading@10:             int hsub = plane == 1 || plane == 2 ? lut->hsub : 0;
yading@10: 
yading@10:             inrow  = in ->data[plane];
yading@10:             outrow = out->data[plane];
yading@10: 
yading@10:             for (i = 0; i < (in->height + (1<<vsub) - 1)>>vsub; i ++) {
yading@10:                 const uint8_t *tab = lut->lut[plane];
yading@10:                 int w = (inlink->w + (1<<hsub) - 1)>>hsub;
yading@10:                 for (j = 0; j < w; j++)
yading@10:                     outrow[j] = tab[inrow[j]];
yading@10:                 inrow  += in ->linesize[plane];
yading@10:                 outrow += out->linesize[plane];
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (!direct)
yading@10:         av_frame_free(&in);
yading@10: 
yading@10:     return ff_filter_frame(outlink, out);
yading@10: }
yading@10: 
yading@10: static const AVFilterPad inputs[] = {
yading@10:     { .name            = "default",
yading@10:       .type            = AVMEDIA_TYPE_VIDEO,
yading@10:       .filter_frame    = filter_frame,
yading@10:       .config_props    = config_props,
yading@10:     },
yading@10:     { .name = NULL}
yading@10: };
yading@10: static const AVFilterPad outputs[] = {
yading@10:     { .name            = "default",
yading@10:       .type            = AVMEDIA_TYPE_VIDEO, },
yading@10:     { .name = NULL}
yading@10: };
yading@10: 
yading@10: #define DEFINE_LUT_FILTER(name_, description_)                          \
yading@10:     AVFilter avfilter_vf_##name_ = {                                    \
yading@10:         .name          = #name_,                                        \
yading@10:         .description   = NULL_IF_CONFIG_SMALL(description_),            \
yading@10:         .priv_size     = sizeof(LutContext),                            \
yading@10:         .priv_class    = &name_ ## _class,                              \
yading@10:                                                                         \
yading@10:         .init          = name_##_init,                                  \
yading@10:         .uninit        = uninit,                                        \
yading@10:         .query_formats = query_formats,                                 \
yading@10:                                                                         \
yading@10:         .inputs        = inputs,                                        \
yading@10:         .outputs       = outputs,                                       \
yading@10:     }
yading@10: 
yading@10: #if CONFIG_LUT_FILTER
yading@10: 
yading@10: #define lut_options options
yading@10: AVFILTER_DEFINE_CLASS(lut);
yading@10: 
yading@10: static int lut_init(AVFilterContext *ctx)
yading@10: {
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: DEFINE_LUT_FILTER(lut, "Compute and apply a lookup table to the RGB/YUV input video.");
yading@10: #endif
yading@10: 
yading@10: #if CONFIG_LUTYUV_FILTER
yading@10: 
yading@10: #define lutyuv_options options
yading@10: AVFILTER_DEFINE_CLASS(lutyuv);
yading@10: 
yading@10: static int lutyuv_init(AVFilterContext *ctx)
yading@10: {
yading@10:     LutContext *lut = ctx->priv;
yading@10: 
yading@10:     lut->is_yuv = 1;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: DEFINE_LUT_FILTER(lutyuv, "Compute and apply a lookup table to the YUV input video.");
yading@10: #endif
yading@10: 
yading@10: #if CONFIG_LUTRGB_FILTER
yading@10: 
yading@10: #define lutrgb_options options
yading@10: AVFILTER_DEFINE_CLASS(lutrgb);
yading@10: 
yading@10: static int lutrgb_init(AVFilterContext *ctx)
yading@10: {
yading@10:     LutContext *lut = ctx->priv;
yading@10: 
yading@10:     lut->is_rgb = 1;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: DEFINE_LUT_FILTER(lutrgb, "Compute and apply a lookup table to the RGB input video.");
yading@10: #endif
yading@10: 
yading@10: #if CONFIG_NEGATE_FILTER
yading@10: 
yading@10: static const AVOption negate_options[] = {
yading@10:     { "negate_alpha", NULL, OFFSET(negate_alpha), AV_OPT_TYPE_INT, { .i64 = 0 }, .flags = FLAGS },
yading@10:     { NULL },
yading@10: };
yading@10: 
yading@10: AVFILTER_DEFINE_CLASS(negate);
yading@10: 
yading@10: static int negate_init(AVFilterContext *ctx)
yading@10: {
yading@10:     LutContext *lut = ctx->priv;
yading@10:     int i;
yading@10: 
yading@10:     av_log(ctx, AV_LOG_DEBUG, "negate_alpha:%d\n", lut->negate_alpha);
yading@10: 
yading@10:     for (i = 0; i < 4; i++) {
yading@10:         lut->comp_expr_str[i] = av_strdup((i == 3 && !lut->negate_alpha) ?
yading@10:                                           "val" : "negval");
yading@10:         if (!lut->comp_expr_str[i]) {
yading@10:             uninit(ctx);
yading@10:             return AVERROR(ENOMEM);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: DEFINE_LUT_FILTER(negate, "Negate input video.");
yading@10: 
yading@10: #endif