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  1. /*
  2.  * Copyright (C) 2006 Michael Niedermayer <michaelni@gmx.at>
  3.  * Copyright (C) 2012 Clément Bœsch <u pkh me>
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or modify
  8.  * it under the terms of the GNU General Public License as published by
  9.  * the Free Software Foundation; either version 2 of the License, or
  10.  * (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15.  * GNU General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU General Public License along
  18.  * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
  19.  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  * Generic equation change filter
  25.  * Originally written by Michael Niedermayer for the MPlayer project, and
  26.  * ported by Clément Bœsch for FFmpeg.
  27.  */
  28.  
  29. #include "libavutil/avstring.h"
  30. #include "libavutil/eval.h"
  31. #include "libavutil/opt.h"
  32. #include "libavutil/pixdesc.h"
  33. #include "internal.h"
  34.  
  35. typedef struct {
  36.     const AVClass *class;
  37.     AVExpr *e[4];               ///< expressions for each plane
  38.     char *expr_str[4+3];        ///< expression strings for each plane
  39.     AVFrame *picref;            ///< current input buffer
  40.     int hsub, vsub;             ///< chroma subsampling
  41.     int planes;                 ///< number of planes
  42.     int is_rgb;
  43. } GEQContext;
  44.  
  45. enum { Y = 0, U, V, A, G, B, R };
  46.  
  47. #define OFFSET(x) offsetof(GEQContext, x)
  48. #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
  49.  
  50. static const AVOption geq_options[] = {
  51.     { "lum_expr",   "set luminance expression",   OFFSET(expr_str[Y]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
  52.     { "lum",        "set luminance expression",   OFFSET(expr_str[Y]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
  53.     { "cb_expr",    "set chroma blue expression", OFFSET(expr_str[U]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
  54.     { "cb",         "set chroma blue expression", OFFSET(expr_str[U]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
  55.     { "cr_expr",    "set chroma red expression",  OFFSET(expr_str[V]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
  56.     { "cr",         "set chroma red expression",  OFFSET(expr_str[V]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
  57.     { "alpha_expr", "set alpha expression",       OFFSET(expr_str[A]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
  58.     { "a",          "set alpha expression",       OFFSET(expr_str[A]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
  59.     { "red_expr",   "set red expression",         OFFSET(expr_str[R]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
  60.     { "r",          "set red expression",         OFFSET(expr_str[R]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
  61.     { "green_expr", "set green expression",       OFFSET(expr_str[G]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
  62.     { "g",          "set green expression",       OFFSET(expr_str[G]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
  63.     { "blue_expr",  "set blue expression",        OFFSET(expr_str[B]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
  64.     { "b",          "set blue expression",        OFFSET(expr_str[B]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
  65.     {NULL},
  66. };
  67.  
  68. AVFILTER_DEFINE_CLASS(geq);
  69.  
  70. static inline double getpix(void *priv, double x, double y, int plane)
  71. {
  72.     int xi, yi;
  73.     GEQContext *geq = priv;
  74.     AVFrame *picref = geq->picref;
  75.     const uint8_t *src = picref->data[plane];
  76.     const int linesize = picref->linesize[plane];
  77.     const int w = (plane == 1 || plane == 2) ? FF_CEIL_RSHIFT(picref->width,  geq->hsub) : picref->width;
  78.     const int h = (plane == 1 || plane == 2) ? FF_CEIL_RSHIFT(picref->height, geq->vsub) : picref->height;
  79.  
  80.     if (!src)
  81.         return 0;
  82.  
  83.     xi = x = av_clipf(x, 0, w - 2);
  84.     yi = y = av_clipf(y, 0, h - 2);
  85.  
  86.     x -= xi;
  87.     y -= yi;
  88.  
  89.     return (1-y)*((1-x)*src[xi +  yi    * linesize] + x*src[xi + 1 +  yi    * linesize])
  90.           +   y *((1-x)*src[xi + (yi+1) * linesize] + x*src[xi + 1 + (yi+1) * linesize]);
  91. }
  92.  
  93. //TODO: cubic interpolate
  94. //TODO: keep the last few frames
  95. static double lum(void *priv, double x, double y) { return getpix(priv, x, y, 0); }
  96. static double  cb(void *priv, double x, double y) { return getpix(priv, x, y, 1); }
  97. static double  cr(void *priv, double x, double y) { return getpix(priv, x, y, 2); }
  98. static double alpha(void *priv, double x, double y) { return getpix(priv, x, y, 3); }
  99.  
  100. static const char *const var_names[] = {   "X",   "Y",   "W",   "H",   "N",   "SW",   "SH",   "T",        NULL };
  101. enum                                   { VAR_X, VAR_Y, VAR_W, VAR_H, VAR_N, VAR_SW, VAR_SH, VAR_T, VAR_VARS_NB };
  102.  
  103. static av_cold int geq_init(AVFilterContext *ctx)
  104. {
  105.     GEQContext *geq = ctx->priv;
  106.     int plane, ret = 0;
  107.  
  108.     if (!geq->expr_str[Y] && !geq->expr_str[G] && !geq->expr_str[B] && !geq->expr_str[R]) {
  109.         av_log(ctx, AV_LOG_ERROR, "A luminance or RGB expression is mandatory\n");
  110.         ret = AVERROR(EINVAL);
  111.         goto end;
  112.     }
  113.     geq->is_rgb = !geq->expr_str[Y];
  114.  
  115.     if ((geq->expr_str[Y] || geq->expr_str[U] || geq->expr_str[V]) && (geq->expr_str[G] || geq->expr_str[B] || geq->expr_str[R])) {
  116.         av_log(ctx, AV_LOG_ERROR, "Either YCbCr or RGB but not both must be specified\n");
  117.         ret = AVERROR(EINVAL);
  118.         goto end;
  119.     }
  120.  
  121.     if (!geq->expr_str[U] && !geq->expr_str[V]) {
  122.         /* No chroma at all: fallback on luma */
  123.         geq->expr_str[U] = av_strdup(geq->expr_str[Y]);
  124.         geq->expr_str[V] = av_strdup(geq->expr_str[Y]);
  125.     } else {
  126.         /* One chroma unspecified, fallback on the other */
  127.         if (!geq->expr_str[U]) geq->expr_str[U] = av_strdup(geq->expr_str[V]);
  128.         if (!geq->expr_str[V]) geq->expr_str[V] = av_strdup(geq->expr_str[U]);
  129.     }
  130.  
  131.     if (!geq->expr_str[A])
  132.         geq->expr_str[A] = av_strdup("255");
  133.     if (!geq->expr_str[G])
  134.         geq->expr_str[G] = av_strdup("g(X,Y)");
  135.     if (!geq->expr_str[B])
  136.         geq->expr_str[B] = av_strdup("b(X,Y)");
  137.     if (!geq->expr_str[R])
  138.         geq->expr_str[R] = av_strdup("r(X,Y)");
  139.  
  140.     if (geq->is_rgb ?
  141.             (!geq->expr_str[G] || !geq->expr_str[B] || !geq->expr_str[R])
  142.                     :
  143.             (!geq->expr_str[U] || !geq->expr_str[V] || !geq->expr_str[A])) {
  144.         ret = AVERROR(ENOMEM);
  145.         goto end;
  146.     }
  147.  
  148.     for (plane = 0; plane < 4; plane++) {
  149.         static double (*p[])(void *, double, double) = { lum, cb, cr, alpha };
  150.         static const char *const func2_yuv_names[]    = { "lum", "cb", "cr", "alpha", "p", NULL };
  151.         static const char *const func2_rgb_names[]    = { "g", "b", "r", "alpha", "p", NULL };
  152.         const char *const *func2_names       = geq->is_rgb ? func2_rgb_names : func2_yuv_names;
  153.         double (*func2[])(void *, double, double) = { lum, cb, cr, alpha, p[plane], NULL };
  154.  
  155.         ret = av_expr_parse(&geq->e[plane], geq->expr_str[plane < 3 && geq->is_rgb ? plane+4 : plane], var_names,
  156.                             NULL, NULL, func2_names, func2, 0, ctx);
  157.         if (ret < 0)
  158.             break;
  159.     }
  160.  
  161. end:
  162.     return ret;
  163. }
  164.  
  165. static int geq_query_formats(AVFilterContext *ctx)
  166. {
  167.     GEQContext *geq = ctx->priv;
  168.     static const enum PixelFormat yuv_pix_fmts[] = {
  169.         AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV420P,
  170.         AV_PIX_FMT_YUV411P,  AV_PIX_FMT_YUV410P,  AV_PIX_FMT_YUV440P,
  171.         AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
  172.         AV_PIX_FMT_GRAY8,
  173.         AV_PIX_FMT_NONE
  174.     };
  175.     static const enum PixelFormat rgb_pix_fmts[] = {
  176.         AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
  177.         AV_PIX_FMT_NONE
  178.     };
  179.     if (geq->is_rgb) {
  180.         ff_set_common_formats(ctx, ff_make_format_list(rgb_pix_fmts));
  181.     } else
  182.         ff_set_common_formats(ctx, ff_make_format_list(yuv_pix_fmts));
  183.     return 0;
  184. }
  185.  
  186. static int geq_config_props(AVFilterLink *inlink)
  187. {
  188.     GEQContext *geq = inlink->dst->priv;
  189.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
  190.  
  191.     geq->hsub = desc->log2_chroma_w;
  192.     geq->vsub = desc->log2_chroma_h;
  193.     geq->planes = desc->nb_components;
  194.     return 0;
  195. }
  196.  
  197. static int geq_filter_frame(AVFilterLink *inlink, AVFrame *in)
  198. {
  199.     int plane;
  200.     GEQContext *geq = inlink->dst->priv;
  201.     AVFilterLink *outlink = inlink->dst->outputs[0];
  202.     AVFrame *out;
  203.     double values[VAR_VARS_NB] = {
  204.         [VAR_N] = inlink->frame_count,
  205.         [VAR_T] = in->pts == AV_NOPTS_VALUE ? NAN : in->pts * av_q2d(inlink->time_base),
  206.     };
  207.  
  208.     geq->picref = in;
  209.     out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
  210.     if (!out) {
  211.         av_frame_free(&in);
  212.         return AVERROR(ENOMEM);
  213.     }
  214.     av_frame_copy_props(out, in);
  215.  
  216.     for (plane = 0; plane < geq->planes && out->data[plane]; plane++) {
  217.         int x, y;
  218.         uint8_t *dst = out->data[plane];
  219.         const int linesize = out->linesize[plane];
  220.         const int w = (plane == 1 || plane == 2) ? FF_CEIL_RSHIFT(inlink->w, geq->hsub) : inlink->w;
  221.         const int h = (plane == 1 || plane == 2) ? FF_CEIL_RSHIFT(inlink->h, geq->vsub) : inlink->h;
  222.  
  223.         values[VAR_W]  = w;
  224.         values[VAR_H]  = h;
  225.         values[VAR_SW] = w / (double)inlink->w;
  226.         values[VAR_SH] = h / (double)inlink->h;
  227.  
  228.         for (y = 0; y < h; y++) {
  229.             values[VAR_Y] = y;
  230.             for (x = 0; x < w; x++) {
  231.                 values[VAR_X] = x;
  232.                 dst[x] = av_expr_eval(geq->e[plane], values, geq);
  233.             }
  234.             dst += linesize;
  235.         }
  236.     }
  237.  
  238.     av_frame_free(&geq->picref);
  239.     return ff_filter_frame(outlink, out);
  240. }
  241.  
  242. static av_cold void geq_uninit(AVFilterContext *ctx)
  243. {
  244.     int i;
  245.     GEQContext *geq = ctx->priv;
  246.  
  247.     for (i = 0; i < FF_ARRAY_ELEMS(geq->e); i++)
  248.         av_expr_free(geq->e[i]);
  249. }
  250.  
  251. static const AVFilterPad geq_inputs[] = {
  252.     {
  253.         .name         = "default",
  254.         .type         = AVMEDIA_TYPE_VIDEO,
  255.         .config_props = geq_config_props,
  256.         .filter_frame = geq_filter_frame,
  257.     },
  258.     { NULL }
  259. };
  260.  
  261. static const AVFilterPad geq_outputs[] = {
  262.     {
  263.         .name = "default",
  264.         .type = AVMEDIA_TYPE_VIDEO,
  265.     },
  266.     { NULL }
  267. };
  268.  
  269. AVFilter avfilter_vf_geq = {
  270.     .name          = "geq",
  271.     .description   = NULL_IF_CONFIG_SMALL("Apply generic equation to each pixel."),
  272.     .priv_size     = sizeof(GEQContext),
  273.     .init          = geq_init,
  274.     .uninit        = geq_uninit,
  275.     .query_formats = geq_query_formats,
  276.     .inputs        = geq_inputs,
  277.     .outputs       = geq_outputs,
  278.     .priv_class    = &geq_class,
  279.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
  280. };
  281.