245 lines
8.2 KiB
C
245 lines
8.2 KiB
C
/*
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* Copyright (C) 2006 Michael Niedermayer <michaelni@gmx.at>
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* Copyright (C) 2012 Clément Bœsch <ubitux@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/**
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* @file
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* Generic equation change filter
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* Originally written by Michael Niedermayer for the MPlayer project, and
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* ported by Clément Bœsch for FFmpeg.
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*/
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#include "libavutil/avstring.h"
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#include "libavutil/eval.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "internal.h"
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typedef struct {
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const AVClass *class;
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AVExpr *e[4]; ///< expressions for each plane
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char *expr_str[4]; ///< expression strings for each plane
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int framenum; ///< frame counter
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AVFrame *picref; ///< current input buffer
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int hsub, vsub; ///< chroma subsampling
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int planes; ///< number of planes
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} GEQContext;
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#define OFFSET(x) offsetof(GEQContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption geq_options[] = {
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{ "lum_expr", "set luminance expression", OFFSET(expr_str[0]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "cb_expr", "set chroma blue expression", OFFSET(expr_str[1]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "cr_expr", "set chroma red expression", OFFSET(expr_str[2]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "alpha_expr", "set alpha expression", OFFSET(expr_str[3]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
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{NULL},
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};
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AVFILTER_DEFINE_CLASS(geq);
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static inline double getpix(void *priv, double x, double y, int plane)
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{
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int xi, yi;
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GEQContext *geq = priv;
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AVFrame *picref = geq->picref;
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const uint8_t *src = picref->data[plane];
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const int linesize = picref->linesize[plane];
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const int w = picref->width >> ((plane == 1 || plane == 2) ? geq->hsub : 0);
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const int h = picref->height >> ((plane == 1 || plane == 2) ? geq->vsub : 0);
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if (!src)
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return 0;
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xi = x = av_clipf(x, 0, w - 2);
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yi = y = av_clipf(y, 0, h - 2);
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x -= xi;
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y -= yi;
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return (1-y)*((1-x)*src[xi + yi * linesize] + x*src[xi + 1 + yi * linesize])
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+ y *((1-x)*src[xi + (yi+1) * linesize] + x*src[xi + 1 + (yi+1) * linesize]);
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}
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//TODO: cubic interpolate
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//TODO: keep the last few frames
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static double lum(void *priv, double x, double y) { return getpix(priv, x, y, 0); }
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static double cb(void *priv, double x, double y) { return getpix(priv, x, y, 1); }
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static double cr(void *priv, double x, double y) { return getpix(priv, x, y, 2); }
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static double alpha(void *priv, double x, double y) { return getpix(priv, x, y, 3); }
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static const char *const var_names[] = { "X", "Y", "W", "H", "N", "SW", "SH", "T", NULL };
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enum { VAR_X, VAR_Y, VAR_W, VAR_H, VAR_N, VAR_SW, VAR_SH, VAR_T, VAR_VARS_NB };
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static av_cold int geq_init(AVFilterContext *ctx, const char *args)
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{
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GEQContext *geq = ctx->priv;
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int plane, ret = 0;
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if (!geq->expr_str[0]) {
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av_log(ctx, AV_LOG_ERROR, "Luminance expression is mandatory\n");
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ret = AVERROR(EINVAL);
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goto end;
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}
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if (!geq->expr_str[1] && !geq->expr_str[2]) {
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/* No chroma at all: fallback on luma */
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geq->expr_str[1] = av_strdup(geq->expr_str[0]);
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geq->expr_str[2] = av_strdup(geq->expr_str[0]);
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} else {
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/* One chroma unspecified, fallback on the other */
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if (!geq->expr_str[1]) geq->expr_str[1] = av_strdup(geq->expr_str[2]);
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if (!geq->expr_str[2]) geq->expr_str[2] = av_strdup(geq->expr_str[1]);
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}
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if (!geq->expr_str[3])
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geq->expr_str[3] = av_strdup("255");
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if (!geq->expr_str[1] || !geq->expr_str[2] || !geq->expr_str[3]) {
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ret = AVERROR(ENOMEM);
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goto end;
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}
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for (plane = 0; plane < 4; plane++) {
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static double (*p[])(void *, double, double) = { lum, cb, cr, alpha };
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static const char *const func2_names[] = { "lum", "cb", "cr", "alpha", "p", NULL };
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double (*func2[])(void *, double, double) = { lum, cb, cr, alpha, p[plane], NULL };
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ret = av_expr_parse(&geq->e[plane], geq->expr_str[plane], var_names,
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NULL, NULL, func2_names, func2, 0, ctx);
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if (ret < 0)
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break;
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}
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end:
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return ret;
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}
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static int geq_query_formats(AVFilterContext *ctx)
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{
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static const enum PixelFormat pix_fmts[] = {
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
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AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
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AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
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AV_PIX_FMT_GRAY8,
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AV_PIX_FMT_NONE
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};
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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return 0;
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}
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static int geq_config_props(AVFilterLink *inlink)
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{
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GEQContext *geq = inlink->dst->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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geq->hsub = desc->log2_chroma_w;
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geq->vsub = desc->log2_chroma_h;
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geq->planes = desc->nb_components;
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return 0;
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}
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static int geq_filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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int plane;
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GEQContext *geq = inlink->dst->priv;
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AVFilterLink *outlink = inlink->dst->outputs[0];
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AVFrame *out;
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double values[VAR_VARS_NB] = {
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[VAR_N] = geq->framenum++,
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[VAR_T] = in->pts == AV_NOPTS_VALUE ? NAN : in->pts * av_q2d(inlink->time_base),
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};
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geq->picref = in;
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out) {
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av_frame_free(&in);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(out, in);
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for (plane = 0; plane < geq->planes && out->data[plane]; plane++) {
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int x, y;
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uint8_t *dst = out->data[plane];
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const int linesize = out->linesize[plane];
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const int w = inlink->w >> ((plane == 1 || plane == 2) ? geq->hsub : 0);
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const int h = inlink->h >> ((plane == 1 || plane == 2) ? geq->vsub : 0);
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values[VAR_W] = w;
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values[VAR_H] = h;
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values[VAR_SW] = w / (double)inlink->w;
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values[VAR_SH] = h / (double)inlink->h;
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for (y = 0; y < h; y++) {
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values[VAR_Y] = y;
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for (x = 0; x < w; x++) {
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values[VAR_X] = x;
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dst[x] = av_expr_eval(geq->e[plane], values, geq);
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}
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dst += linesize;
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}
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}
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av_frame_free(&geq->picref);
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return ff_filter_frame(outlink, out);
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}
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static av_cold void geq_uninit(AVFilterContext *ctx)
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{
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int i;
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GEQContext *geq = ctx->priv;
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for (i = 0; i < FF_ARRAY_ELEMS(geq->e); i++)
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av_expr_free(geq->e[i]);
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}
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static const AVFilterPad geq_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = geq_config_props,
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.filter_frame = geq_filter_frame,
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},
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{ NULL }
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};
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static const AVFilterPad geq_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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static const char *const shorthand[] = { "lum_expr", "cb_expr", "cr_expr", "alpha_expr", NULL };
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AVFilter avfilter_vf_geq = {
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.name = "geq",
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.description = NULL_IF_CONFIG_SMALL("Apply generic equation to each pixel."),
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.priv_size = sizeof(GEQContext),
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.init = geq_init,
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.uninit = geq_uninit,
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.query_formats = geq_query_formats,
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.inputs = geq_inputs,
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.outputs = geq_outputs,
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.priv_class = &geq_class,
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.shorthand = shorthand,
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};
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