/* * Copyright (C) 2006 Michael Niedermayer <michaelni@gmx.at> * Copyright (C) 2012 Clément Bœsch <ubitux@gmail.com> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 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 General Public License for more details. * * You should have received a copy of the GNU 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. */ /** * @file * Generic equation change filter * Originally written by Michael Niedermayer for the MPlayer project, and * ported by Clément Bœsch for FFmpeg. */ #include "libavutil/avstring.h" #include "libavutil/eval.h" #include "libavutil/opt.h" #include "libavutil/pixdesc.h" #include "internal.h" typedef struct { const AVClass *class; AVExpr *e[3]; ///< expressions for each plane char *expr_str[3]; ///< expression strings for each plane int framenum; ///< frame counter AVFilterBufferRef *picref; ///< current input buffer int hsub, vsub; ///< chroma subsampling } GEQContext; #define OFFSET(x) offsetof(GEQContext, x) #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM static const AVOption geq_options[] = { { "lum_expr", "set luminance expression", OFFSET(expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, { "cb_expr", "set chroma blue expression", OFFSET(expr_str) + sizeof(char*), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, { "cr_expr", "set chroma red expression", OFFSET(expr_str) + 2*sizeof(char*), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, {NULL}, }; AVFILTER_DEFINE_CLASS(geq); static inline double getpix(void *priv, double x, double y, int plane) { int xi, yi; GEQContext *geq = priv; AVFilterBufferRef *picref = geq->picref; const uint8_t *src = picref->data[plane]; const int linesize = picref->linesize[plane]; const int w = picref->video->w >> (plane ? geq->hsub : 0); const int h = picref->video->h >> (plane ? geq->vsub : 0); xi = x = av_clipf(x, 0, w - 2); yi = y = av_clipf(y, 0, h - 2); x -= xi; y -= yi; return (1-y)*((1-x)*src[xi + yi * linesize] + x*src[xi + 1 + yi * linesize]) + y *((1-x)*src[xi + (yi+1) * linesize] + x*src[xi + 1 + (yi+1) * linesize]); } //TODO: cubic interpolate //TODO: keep the last few frames static double lum(void *priv, double x, double y) { return getpix(priv, x, y, 0); } static double cb(void *priv, double x, double y) { return getpix(priv, x, y, 1); } static double cr(void *priv, double x, double y) { return getpix(priv, x, y, 2); } static const char *const var_names[] = { "X", "Y", "W", "H", "N", "SW", "SH", "T", NULL }; enum { VAR_X, VAR_Y, VAR_W, VAR_H, VAR_N, VAR_SW, VAR_SH, VAR_T, VAR_VARS_NB }; static av_cold int geq_init(AVFilterContext *ctx, const char *args) { GEQContext *geq = ctx->priv; int plane, ret = 0; static const char *shorthand[] = { "lum_expr", "cb_expr", "cr_expr", NULL }; geq->class = &geq_class; av_opt_set_defaults(geq); if ((ret = av_opt_set_from_string(geq, args, shorthand, "=", ":")) < 0) return ret; if (!geq->expr_str[0]) { av_log(ctx, AV_LOG_ERROR, "Luminance expression is mandatory\n"); ret = AVERROR(EINVAL); goto end; } if (!geq->expr_str[1] && !geq->expr_str[2]) { /* No chroma at all: fallback on luma */ geq->expr_str[1] = av_strdup(geq->expr_str[0]); geq->expr_str[2] = av_strdup(geq->expr_str[0]); } else { /* One chroma unspecified, fallback on the other */ if (!geq->expr_str[1]) geq->expr_str[1] = av_strdup(geq->expr_str[2]); if (!geq->expr_str[2]) geq->expr_str[2] = av_strdup(geq->expr_str[1]); } if (!geq->expr_str[1] || !geq->expr_str[2]) { ret = AVERROR(ENOMEM); goto end; } for (plane = 0; plane < 3; plane++) { static double (*p[])(void *, double, double) = { lum, cb, cr }; static const char *const func2_names[] = { "lum", "cb", "cr", "p", NULL }; double (*func2[])(void *, double, double) = { lum, cb, cr, p[plane], NULL }; ret = av_expr_parse(&geq->e[plane], geq->expr_str[plane], var_names, NULL, NULL, func2_names, func2, 0, ctx); if (ret < 0) break; } end: return ret; } static int geq_query_formats(AVFilterContext *ctx) { static const enum PixelFormat pix_fmts[] = { AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE }; ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); return 0; } static int geq_config_props(AVFilterLink *inlink) { GEQContext *geq = inlink->dst->priv; const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); geq->hsub = desc->log2_chroma_w; geq->vsub = desc->log2_chroma_h; return 0; } static int geq_filter_frame(AVFilterLink *inlink, AVFilterBufferRef *in) { int plane; GEQContext *geq = inlink->dst->priv; AVFilterLink *outlink = inlink->dst->outputs[0]; AVFilterBufferRef *out; double values[VAR_VARS_NB] = { [VAR_N] = geq->framenum++, [VAR_T] = in->pts == AV_NOPTS_VALUE ? NAN : in->pts * av_q2d(inlink->time_base), }; geq->picref = in; out = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h); if (!out) { avfilter_unref_bufferp(&in); return AVERROR(ENOMEM); } avfilter_copy_buffer_ref_props(out, in); for (plane = 0; plane < 3; plane++) { int x, y; uint8_t *dst = out->data[plane]; const int linesize = out->linesize[plane]; const int w = inlink->w >> (plane ? geq->hsub : 0); const int h = inlink->h >> (plane ? geq->vsub : 0); values[VAR_W] = w; values[VAR_H] = h; values[VAR_SW] = w / (double)inlink->w; values[VAR_SH] = h / (double)inlink->h; for (y = 0; y < h; y++) { values[VAR_Y] = y; for (x = 0; x < w; x++) { values[VAR_X] = x; dst[x] = av_expr_eval(geq->e[plane], values, geq); } dst += linesize; } } avfilter_unref_bufferp(&geq->picref); return ff_filter_frame(outlink, out); } static av_cold void geq_uninit(AVFilterContext *ctx) { int i; GEQContext *geq = ctx->priv; for (i = 0; i < FF_ARRAY_ELEMS(geq->e); i++) av_expr_free(geq->e[i]); av_opt_free(geq); } static const AVFilterPad geq_inputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, .config_props = geq_config_props, .filter_frame = geq_filter_frame, .min_perms = AV_PERM_READ, }, { NULL } }; static const AVFilterPad geq_outputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, }, { NULL } }; AVFilter avfilter_vf_geq = { .name = "geq", .description = NULL_IF_CONFIG_SMALL("Apply generic equation to each pixel."), .priv_size = sizeof(GEQContext), .init = geq_init, .uninit = geq_uninit, .query_formats = geq_query_formats, .inputs = geq_inputs, .outputs = geq_outputs, .priv_class = &geq_class, };