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/* |
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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/imgutils.h" |
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#include "libavutil/intreadwrite.h" |
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#include "avfilter.h" |
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#include "formats.h" |
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#include "internal.h" |
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#include "video.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)); |
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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)); |
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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 = avctx->internal->execute(avctx, ctx->do_slice, frame, NULL, 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 query_formats(AVFilterContext *avctx) |
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{ |
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static const enum AVPixelFormat pixel_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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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, |
331 |
|
|
AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16, |
332 |
|
|
AV_PIX_FMT_NONE |
333 |
|
|
}; |
334 |
|
|
|
335 |
|
|
AVFilterFormats *formats = NULL; |
336 |
|
|
|
337 |
|
|
formats = ff_make_format_list(!strcmp(avctx->filter->name, "chromahold") ? hold_pixel_fmts : pixel_fmts); |
338 |
|
|
if (!formats) |
339 |
|
|
return AVERROR(ENOMEM); |
340 |
|
|
|
341 |
|
|
return ff_set_common_formats(avctx, formats); |
342 |
|
|
} |
343 |
|
|
|
344 |
|
|
static av_cold int config_input(AVFilterLink *inlink) |
345 |
|
|
{ |
346 |
|
|
AVFilterContext *avctx = inlink->dst; |
347 |
|
|
ChromakeyContext *ctx = avctx->priv; |
348 |
|
|
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
349 |
|
|
|
350 |
|
|
ctx->hsub_log2 = desc->log2_chroma_w; |
351 |
|
|
ctx->vsub_log2 = desc->log2_chroma_h; |
352 |
|
|
|
353 |
|
|
return 0; |
354 |
|
|
} |
355 |
|
|
|
356 |
|
|
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, |
357 |
|
|
char *res, int res_len, int flags) |
358 |
|
|
{ |
359 |
|
|
int ret; |
360 |
|
|
|
361 |
|
|
ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags); |
362 |
|
|
if (ret < 0) |
363 |
|
|
return ret; |
364 |
|
|
|
365 |
|
|
return config_output(ctx->outputs[0]); |
366 |
|
|
} |
367 |
|
|
|
368 |
|
|
static const AVFilterPad chromakey_inputs[] = { |
369 |
|
|
{ |
370 |
|
|
.name = "default", |
371 |
|
|
.type = AVMEDIA_TYPE_VIDEO, |
372 |
|
|
.needs_writable = 1, |
373 |
|
|
.filter_frame = filter_frame, |
374 |
|
|
.config_props = config_input, |
375 |
|
|
}, |
376 |
|
|
{ NULL } |
377 |
|
|
}; |
378 |
|
|
|
379 |
|
|
static const AVFilterPad chromakey_outputs[] = { |
380 |
|
|
{ |
381 |
|
|
.name = "default", |
382 |
|
|
.type = AVMEDIA_TYPE_VIDEO, |
383 |
|
|
.config_props = config_output, |
384 |
|
|
}, |
385 |
|
|
{ NULL } |
386 |
|
|
}; |
387 |
|
|
|
388 |
|
|
#define OFFSET(x) offsetof(ChromakeyContext, x) |
389 |
|
|
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM |
390 |
|
|
|
391 |
|
|
static const AVOption chromakey_options[] = { |
392 |
|
|
{ "color", "set the chromakey key color", OFFSET(chromakey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, 0, 0, FLAGS }, |
393 |
|
|
{ "similarity", "set the chromakey similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 1.0, FLAGS }, |
394 |
|
|
{ "blend", "set the chromakey key blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS }, |
395 |
|
|
{ "yuv", "color parameter is in yuv instead of rgb", OFFSET(is_yuv), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS }, |
396 |
|
|
{ NULL } |
397 |
|
|
}; |
398 |
|
|
|
399 |
|
|
AVFILTER_DEFINE_CLASS(chromakey); |
400 |
|
|
|
401 |
|
|
AVFilter ff_vf_chromakey = { |
402 |
|
|
.name = "chromakey", |
403 |
|
|
.description = NULL_IF_CONFIG_SMALL("Turns a certain color into transparency. Operates on YUV colors."), |
404 |
|
|
.priv_size = sizeof(ChromakeyContext), |
405 |
|
|
.priv_class = &chromakey_class, |
406 |
|
|
.query_formats = query_formats, |
407 |
|
|
.inputs = chromakey_inputs, |
408 |
|
|
.outputs = chromakey_outputs, |
409 |
|
|
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS, |
410 |
|
|
.process_command = process_command, |
411 |
|
|
}; |
412 |
|
|
|
413 |
|
|
static const AVOption chromahold_options[] = { |
414 |
|
|
{ "color", "set the chromahold key color", OFFSET(chromakey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, 0, 0, FLAGS }, |
415 |
|
|
{ "similarity", "set the chromahold similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 1.0, FLAGS }, |
416 |
|
|
{ "blend", "set the chromahold blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS }, |
417 |
|
|
{ "yuv", "color parameter is in yuv instead of rgb", OFFSET(is_yuv), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS }, |
418 |
|
|
{ NULL } |
419 |
|
|
}; |
420 |
|
|
|
421 |
|
|
static const AVFilterPad chromahold_inputs[] = { |
422 |
|
|
{ |
423 |
|
|
.name = "default", |
424 |
|
|
.type = AVMEDIA_TYPE_VIDEO, |
425 |
|
|
.needs_writable = 1, |
426 |
|
|
.filter_frame = filter_frame, |
427 |
|
|
.config_props = config_input, |
428 |
|
|
}, |
429 |
|
|
{ NULL } |
430 |
|
|
}; |
431 |
|
|
|
432 |
|
|
static const AVFilterPad chromahold_outputs[] = { |
433 |
|
|
{ |
434 |
|
|
.name = "default", |
435 |
|
|
.type = AVMEDIA_TYPE_VIDEO, |
436 |
|
|
.config_props = config_output, |
437 |
|
|
}, |
438 |
|
|
{ NULL } |
439 |
|
|
}; |
440 |
|
|
|
441 |
|
|
AVFILTER_DEFINE_CLASS(chromahold); |
442 |
|
|
|
443 |
|
|
AVFilter ff_vf_chromahold = { |
444 |
|
|
.name = "chromahold", |
445 |
|
|
.description = NULL_IF_CONFIG_SMALL("Turns a certain color range into gray."), |
446 |
|
|
.priv_size = sizeof(ChromakeyContext), |
447 |
|
|
.priv_class = &chromahold_class, |
448 |
|
|
.query_formats = query_formats, |
449 |
|
|
.inputs = chromahold_inputs, |
450 |
|
|
.outputs = chromahold_outputs, |
451 |
|
|
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS, |
452 |
|
|
.process_command = process_command, |
453 |
|
|
}; |