mirror of
https://github.com/FFmpeg/FFmpeg.git
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420 lines
14 KiB
C
420 lines
14 KiB
C
/*
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* Copyright (c) 2015 Timo Rothenpieler <timo@rothenpieler.org>
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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
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/opt.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "internal.h"
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typedef struct ChromakeyContext {
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const AVClass *class;
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uint8_t chromakey_rgba[4];
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uint16_t chromakey_uv[2];
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float similarity;
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float blend;
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int is_yuv;
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int depth;
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int mid;
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int max;
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int hsub_log2;
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int vsub_log2;
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int (*do_slice)(AVFilterContext *ctx, void *arg,
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int jobnr, int nb_jobs);
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} ChromakeyContext;
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static uint8_t do_chromakey_pixel(ChromakeyContext *ctx, uint8_t u[9], uint8_t v[9])
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{
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double diff = 0.0;
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int du, dv, i;
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for (i = 0; i < 9; ++i) {
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du = (int)u[i] - ctx->chromakey_uv[0];
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dv = (int)v[i] - ctx->chromakey_uv[1];
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diff += sqrt((du * du + dv * dv) / (255.0 * 255.0 * 2));
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}
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diff /= 9.0;
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if (ctx->blend > 0.0001) {
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return av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0) * 255.0;
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} else {
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return (diff > ctx->similarity) ? 255 : 0;
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}
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}
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static uint16_t do_chromakey_pixel16(ChromakeyContext *ctx, uint16_t u[9], uint16_t v[9])
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{
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double max = ctx->max;
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double diff = 0.0;
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int du, dv, i;
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for (i = 0; i < 9; ++i) {
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du = (int)u[i] - ctx->chromakey_uv[0];
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dv = (int)v[i] - ctx->chromakey_uv[1];
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diff += sqrt((du * du + dv * dv) / (max * max * 2));
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}
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diff /= 9.0;
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if (ctx->blend > 0.0001) {
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return av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0) * max;
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} else {
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return (diff > ctx->similarity) ? max : 0;
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}
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}
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static av_always_inline void get_pixel_uv(AVFrame *frame, int hsub_log2, int vsub_log2, int x, int y, uint8_t *u, uint8_t *v)
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{
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if (x < 0 || x >= frame->width || y < 0 || y >= frame->height)
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return;
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x >>= hsub_log2;
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y >>= vsub_log2;
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*u = frame->data[1][frame->linesize[1] * y + x];
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*v = frame->data[2][frame->linesize[2] * y + x];
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}
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static av_always_inline void get_pixel16_uv(AVFrame *frame, int hsub_log2, int vsub_log2, int x, int y, uint16_t *u, uint16_t *v)
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{
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if (x < 0 || x >= frame->width || y < 0 || y >= frame->height)
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return;
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x >>= hsub_log2;
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y >>= vsub_log2;
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*u = AV_RN16(&frame->data[1][frame->linesize[1] * y + 2 * x]);
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*v = AV_RN16(&frame->data[2][frame->linesize[2] * y + 2 * x]);
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}
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static int do_chromakey_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
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{
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AVFrame *frame = arg;
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const int slice_start = (frame->height * jobnr) / nb_jobs;
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const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;
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ChromakeyContext *ctx = avctx->priv;
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int x, y, xo, yo;
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uint8_t u[9], v[9];
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memset(u, ctx->chromakey_uv[0], sizeof(u));
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memset(v, ctx->chromakey_uv[1], sizeof(v));
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for (y = slice_start; y < slice_end; ++y) {
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for (x = 0; x < frame->width; ++x) {
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for (yo = 0; yo < 3; ++yo) {
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for (xo = 0; xo < 3; ++xo) {
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get_pixel_uv(frame, ctx->hsub_log2, ctx->vsub_log2, x + xo - 1, y + yo - 1, &u[yo * 3 + xo], &v[yo * 3 + xo]);
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}
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}
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frame->data[3][frame->linesize[3] * y + x] = do_chromakey_pixel(ctx, u, v);
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}
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}
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return 0;
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}
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static int do_chromakey16_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
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{
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AVFrame *frame = arg;
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const int slice_start = (frame->height * jobnr) / nb_jobs;
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const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;
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ChromakeyContext *ctx = avctx->priv;
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int x, y, xo, yo;
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uint16_t u[9], v[9];
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for (int i = 0; i < 9; i++) {
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u[i] = ctx->chromakey_uv[0];
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v[i] = ctx->chromakey_uv[1];
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}
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for (y = slice_start; y < slice_end; ++y) {
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for (x = 0; x < frame->width; ++x) {
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uint16_t *dst = (uint16_t *)(frame->data[3] + frame->linesize[3] * y);
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for (yo = 0; yo < 3; ++yo) {
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for (xo = 0; xo < 3; ++xo) {
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get_pixel16_uv(frame, ctx->hsub_log2, ctx->vsub_log2, x + xo - 1, y + yo - 1, &u[yo * 3 + xo], &v[yo * 3 + xo]);
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}
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}
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dst[x] = do_chromakey_pixel16(ctx, u, v);
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}
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}
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return 0;
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}
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static int do_chromahold_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
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{
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ChromakeyContext *ctx = avctx->priv;
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AVFrame *frame = arg;
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const int slice_start = ((frame->height >> ctx->vsub_log2) * jobnr) / nb_jobs;
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const int slice_end = ((frame->height >> ctx->vsub_log2) * (jobnr + 1)) / nb_jobs;
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int x, y, alpha;
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for (y = slice_start; y < slice_end; ++y) {
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for (x = 0; x < frame->width >> ctx->hsub_log2; ++x) {
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int u = frame->data[1][frame->linesize[1] * y + x];
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int v = frame->data[2][frame->linesize[2] * y + x];
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double diff;
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int du, dv;
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du = u - ctx->chromakey_uv[0];
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dv = v - ctx->chromakey_uv[1];
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diff = sqrt((du * du + dv * dv) / (255.0 * 255.0 * 2.0));
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alpha = diff > ctx->similarity;
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if (ctx->blend > 0.0001) {
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double f = 1. - av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0);
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frame->data[1][frame->linesize[1] * y + x] = 128 + (u - 128) * f;
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frame->data[2][frame->linesize[2] * y + x] = 128 + (v - 128) * f;
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} else if (alpha) {
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frame->data[1][frame->linesize[1] * y + x] = 128;
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frame->data[2][frame->linesize[2] * y + x] = 128;
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}
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}
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}
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return 0;
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}
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static int do_chromahold16_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
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{
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ChromakeyContext *ctx = avctx->priv;
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AVFrame *frame = arg;
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const int slice_start = ((frame->height >> ctx->vsub_log2) * jobnr) / nb_jobs;
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const int slice_end = ((frame->height >> ctx->vsub_log2) * (jobnr + 1)) / nb_jobs;
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const int mid = ctx->mid;
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double max = ctx->max;
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int x, y, alpha;
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for (y = slice_start; y < slice_end; ++y) {
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for (x = 0; x < frame->width >> ctx->hsub_log2; ++x) {
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int u = AV_RN16(&frame->data[1][frame->linesize[1] * y + 2 * x]);
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int v = AV_RN16(&frame->data[2][frame->linesize[2] * y + 2 * x]);
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double diff;
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int du, dv;
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du = u - ctx->chromakey_uv[0];
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dv = v - ctx->chromakey_uv[1];
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diff = sqrt((du * du + dv * dv) / (max * max * 2.0));
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alpha = diff > ctx->similarity;
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if (ctx->blend > 0.0001) {
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double f = 1. - av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0);
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AV_WN16(&frame->data[1][frame->linesize[1] * y + 2 * x], mid + (u - mid) * f);
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AV_WN16(&frame->data[2][frame->linesize[2] * y + 2 * x], mid + (v - mid) * f);
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} else if (alpha) {
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AV_WN16(&frame->data[1][frame->linesize[1] * y + 2 * x], mid);
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AV_WN16(&frame->data[2][frame->linesize[2] * y + 2 * x], mid);
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}
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}
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}
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return 0;
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}
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static int filter_frame(AVFilterLink *link, AVFrame *frame)
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{
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AVFilterContext *avctx = link->dst;
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ChromakeyContext *ctx = avctx->priv;
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int res;
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if (res = ff_filter_execute(avctx, ctx->do_slice, frame, NULL,
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FFMIN(frame->height, ff_filter_get_nb_threads(avctx))))
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return res;
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return ff_filter_frame(avctx->outputs[0], frame);
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}
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#define FIXNUM(x) lrint((x) * (1 << 10))
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#define RGB_TO_U(rgb) (((- FIXNUM(0.16874) * rgb[0] - FIXNUM(0.33126) * rgb[1] + FIXNUM(0.50000) * rgb[2] + (1 << 9) - 1) >> 10) + 128)
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#define RGB_TO_V(rgb) ((( FIXNUM(0.50000) * rgb[0] - FIXNUM(0.41869) * rgb[1] - FIXNUM(0.08131) * rgb[2] + (1 << 9) - 1) >> 10) + 128)
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static av_cold int config_output(AVFilterLink *outlink)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
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AVFilterContext *avctx = outlink->src;
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ChromakeyContext *ctx = avctx->priv;
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int factor;
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ctx->depth = desc->comp[0].depth;
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ctx->mid = 1 << (ctx->depth - 1);
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ctx->max = (1 << ctx->depth) - 1;
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factor = 1 << (ctx->depth - 8);
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if (ctx->is_yuv) {
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ctx->chromakey_uv[0] = ctx->chromakey_rgba[1] * factor;
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ctx->chromakey_uv[1] = ctx->chromakey_rgba[2] * factor;
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} else {
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ctx->chromakey_uv[0] = RGB_TO_U(ctx->chromakey_rgba) * factor;
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ctx->chromakey_uv[1] = RGB_TO_V(ctx->chromakey_rgba) * factor;
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}
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if (!strcmp(avctx->filter->name, "chromakey")) {
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ctx->do_slice = ctx->depth <= 8 ? do_chromakey_slice : do_chromakey16_slice;
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} else {
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ctx->do_slice = ctx->depth <= 8 ? do_chromahold_slice: do_chromahold16_slice;
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}
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return 0;
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}
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static av_cold int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *avctx = inlink->dst;
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ChromakeyContext *ctx = avctx->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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ctx->hsub_log2 = desc->log2_chroma_w;
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ctx->vsub_log2 = desc->log2_chroma_h;
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return 0;
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}
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static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
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char *res, int res_len, int flags)
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{
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int ret;
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ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
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if (ret < 0)
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return ret;
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return config_output(ctx->outputs[0]);
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}
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static const AVFilterPad inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
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.filter_frame = filter_frame,
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.config_props = config_input,
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},
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};
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static const AVFilterPad outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_output,
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},
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};
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#define OFFSET(x) offsetof(ChromakeyContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
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static const AVOption chromakey_options[] = {
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{ "color", "set the chromakey key color", OFFSET(chromakey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, 0, 0, FLAGS },
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{ "similarity", "set the chromakey similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.00001, 1.0, FLAGS },
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{ "blend", "set the chromakey key blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
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{ "yuv", "color parameter is in yuv instead of rgb", OFFSET(is_yuv), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
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{ NULL }
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};
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static const enum AVPixelFormat chromakey_fmts[] = {
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AV_PIX_FMT_YUVA420P,
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AV_PIX_FMT_YUVA422P,
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AV_PIX_FMT_YUVA444P,
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AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
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AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
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AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
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AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
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AV_PIX_FMT_NONE
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};
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AVFILTER_DEFINE_CLASS(chromakey);
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const AVFilter ff_vf_chromakey = {
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.name = "chromakey",
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.description = NULL_IF_CONFIG_SMALL("Turns a certain color into transparency. Operates on YUV colors."),
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.priv_size = sizeof(ChromakeyContext),
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.priv_class = &chromakey_class,
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FILTER_INPUTS(inputs),
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FILTER_OUTPUTS(outputs),
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FILTER_PIXFMTS_ARRAY(chromakey_fmts),
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
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.process_command = process_command,
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};
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static const AVOption chromahold_options[] = {
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{ "color", "set the chromahold key color", OFFSET(chromakey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, 0, 0, FLAGS },
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{ "similarity", "set the chromahold similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.00001, 1.0, FLAGS },
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{ "blend", "set the chromahold blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
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{ "yuv", "color parameter is in yuv instead of rgb", OFFSET(is_yuv), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
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{ NULL }
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};
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static const enum AVPixelFormat hold_pixel_fmts[] = {
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AV_PIX_FMT_YUV420P,
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AV_PIX_FMT_YUV422P,
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AV_PIX_FMT_YUV444P,
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AV_PIX_FMT_YUVA420P,
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AV_PIX_FMT_YUVA422P,
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AV_PIX_FMT_YUVA444P,
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AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
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AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
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AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
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AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
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AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
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AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
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AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
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AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
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AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
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AV_PIX_FMT_NONE
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};
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AVFILTER_DEFINE_CLASS(chromahold);
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const AVFilter ff_vf_chromahold = {
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.name = "chromahold",
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.description = NULL_IF_CONFIG_SMALL("Turns a certain color range into gray."),
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.priv_size = sizeof(ChromakeyContext),
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.priv_class = &chromahold_class,
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FILTER_INPUTS(inputs),
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FILTER_OUTPUTS(outputs),
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FILTER_PIXFMTS_ARRAY(hold_pixel_fmts),
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
|
|
.process_command = process_command,
|
|
};
|