302 lines
10 KiB
C
302 lines
10 KiB
C
/*
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* Copyright (c) 2021 Paul B Mahol
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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 <float.h>
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#include "libavutil/opt.h"
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#include "libavutil/imgutils.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 MonochromeContext {
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const AVClass *class;
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float b, r;
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float size;
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float high;
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int depth;
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int subw, subh;
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int (*do_slice)(AVFilterContext *s, void *arg,
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int jobnr, int nb_jobs);
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int (*clear_uv)(AVFilterContext *s, void *arg,
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int jobnr, int nb_jobs);
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} MonochromeContext;
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static float envelope(const float x)
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{
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const float beta = 0.6f;
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if (x < beta) {
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const float tmp = fabsf(x / beta - 1.f);
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return 1.f - tmp * tmp;
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} else {
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const float tmp = (1.f - x) / (1.f - beta);
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return tmp * tmp * (3.f - 2.f * tmp);
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}
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}
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static float filter(float b, float r, float u, float v, float size)
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{
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return expf(-av_clipf(((b - u) * (b - u) +
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(r - v) * (r - v)) *
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size, 0.f, 1.f));
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}
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#define PROCESS() \
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const int cx = x >> subw; \
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float y = yptr[x] * imax; \
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float u = uptr[cx] * imax - .5f; \
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float v = vptr[cx] * imax - .5f; \
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float tt, t, ny; \
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\
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ny = filter(b, r, u, v, size); \
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tt = envelope(y); \
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t = tt + (1.f - tt) * ihigh; \
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ny = (1.f - t) * y + t * ny * y;
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static int monochrome_slice8(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
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{
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MonochromeContext *s = ctx->priv;
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AVFrame *frame = arg;
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const int depth = s->depth;
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const int subw = s->subw;
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const int subh = s->subh;
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const float max = (1 << depth) - 1;
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const float imax = 1.f / max;
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const int width = frame->width;
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const int height = frame->height;
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const int slice_start = (height * jobnr) / nb_jobs;
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const int slice_end = (height * (jobnr + 1)) / nb_jobs;
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const int ylinesize = frame->linesize[0];
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const int ulinesize = frame->linesize[1];
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const int vlinesize = frame->linesize[2];
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uint8_t *yptr = frame->data[0] + slice_start * ylinesize;
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const float ihigh = 1.f - s->high;
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const float size = 1.f / s->size;
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const float b = s->b * .5f;
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const float r = s->r * .5f;
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for (int y = slice_start; y < slice_end; y++) {
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const int cy = y >> subh;
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uint8_t *uptr = frame->data[1] + cy * ulinesize;
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uint8_t *vptr = frame->data[2] + cy * vlinesize;
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for (int x = 0; x < width; x++) {
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PROCESS()
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yptr[x] = av_clip_uint8(lrintf(ny * max));
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}
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yptr += ylinesize;
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}
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return 0;
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}
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static int monochrome_slice16(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
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{
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MonochromeContext *s = ctx->priv;
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AVFrame *frame = arg;
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const int depth = s->depth;
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const int subw = s->subw;
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const int subh = s->subh;
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const float max = (1 << depth) - 1;
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const float imax = 1.f / max;
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const int width = frame->width;
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const int height = frame->height;
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const int slice_start = (height * jobnr) / nb_jobs;
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const int slice_end = (height * (jobnr + 1)) / nb_jobs;
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const int ylinesize = frame->linesize[0] / 2;
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const int ulinesize = frame->linesize[1] / 2;
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const int vlinesize = frame->linesize[2] / 2;
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uint16_t *yptr = (uint16_t *)frame->data[0] + slice_start * ylinesize;
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const float ihigh = 1.f - s->high;
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const float size = 1.f / s->size;
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const float b = s->b * .5f;
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const float r = s->r * .5f;
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for (int y = slice_start; y < slice_end; y++) {
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const int cy = y >> subh;
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uint16_t *uptr = (uint16_t *)frame->data[1] + cy * ulinesize;
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uint16_t *vptr = (uint16_t *)frame->data[2] + cy * vlinesize;
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for (int x = 0; x < width; x++) {
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PROCESS()
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yptr[x] = av_clip_uintp2_c(lrintf(ny * max), depth);
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}
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yptr += ylinesize;
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}
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return 0;
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}
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static int clear_slice8(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
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{
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MonochromeContext *s = ctx->priv;
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AVFrame *frame = arg;
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const int depth = s->depth;
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const int half = 1 << (depth - 1);
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const int subw = s->subw;
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const int subh = s->subh;
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const int width = AV_CEIL_RSHIFT(frame->width, subw);
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const int height = AV_CEIL_RSHIFT(frame->height, subh);
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const int slice_start = (height * jobnr) / nb_jobs;
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const int slice_end = (height * (jobnr + 1)) / nb_jobs;
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const int ulinesize = frame->linesize[1];
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const int vlinesize = frame->linesize[2];
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for (int y = slice_start; y < slice_end; y++) {
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uint8_t *uptr = frame->data[1] + y * ulinesize;
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uint8_t *vptr = frame->data[2] + y * vlinesize;
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memset(uptr, half, width);
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memset(vptr, half, width);
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}
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return 0;
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}
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static int clear_slice16(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
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{
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MonochromeContext *s = ctx->priv;
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AVFrame *frame = arg;
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const int depth = s->depth;
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const int half = 1 << (depth - 1);
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const int subw = s->subw;
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const int subh = s->subh;
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const int width = AV_CEIL_RSHIFT(frame->width, subw);
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const int height = AV_CEIL_RSHIFT(frame->height, subh);
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const int slice_start = (height * jobnr) / nb_jobs;
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const int slice_end = (height * (jobnr + 1)) / nb_jobs;
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const int ulinesize = frame->linesize[1] / 2;
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const int vlinesize = frame->linesize[2] / 2;
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for (int y = slice_start; y < slice_end; y++) {
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uint16_t *uptr = (uint16_t *)frame->data[1] + y * ulinesize;
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uint16_t *vptr = (uint16_t *)frame->data[2] + y * vlinesize;
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for (int x = 0; x < width; x++) {
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uptr[x] = half;
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vptr[x] = half;
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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 *inlink, AVFrame *frame)
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{
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AVFilterContext *ctx = inlink->dst;
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MonochromeContext *s = ctx->priv;
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ff_filter_execute(ctx, s->do_slice, frame, NULL,
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FFMIN(frame->height, ff_filter_get_nb_threads(ctx)));
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ff_filter_execute(ctx, s->clear_uv, frame, NULL,
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FFMIN(frame->height >> s->subh, ff_filter_get_nb_threads(ctx)));
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return ff_filter_frame(ctx->outputs[0], frame);
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}
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static const enum AVPixelFormat pixel_fmts[] = {
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AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
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AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
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AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
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AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P,
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AV_PIX_FMT_YUVJ411P,
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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_YUV440P10,
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AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
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AV_PIX_FMT_YUV440P12,
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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_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
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AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12, AV_PIX_FMT_YUVA444P16,
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AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA422P16,
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AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,
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AV_PIX_FMT_NONE
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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 *ctx = inlink->dst;
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MonochromeContext *s = ctx->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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s->depth = desc->comp[0].depth;
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s->do_slice = s->depth <= 8 ? monochrome_slice8 : monochrome_slice16;
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s->clear_uv = s->depth <= 8 ? clear_slice8 : clear_slice16;
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s->subw = desc->log2_chroma_w;
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s->subh = desc->log2_chroma_h;
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return 0;
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}
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static const AVFilterPad monochrome_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 monochrome_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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};
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#define OFFSET(x) offsetof(MonochromeContext, x)
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#define VF AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
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static const AVOption monochrome_options[] = {
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{ "cb", "set the chroma blue spot", OFFSET(b), AV_OPT_TYPE_FLOAT, {.dbl=0},-1, 1, VF },
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{ "cr", "set the chroma red spot", OFFSET(r), AV_OPT_TYPE_FLOAT, {.dbl=0},-1, 1, VF },
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{ "size", "set the color filter size", OFFSET(size), AV_OPT_TYPE_FLOAT, {.dbl=1},.1,10, VF },
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{ "high", "set the highlights strength", OFFSET(high), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, 1, VF },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(monochrome);
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const AVFilter ff_vf_monochrome = {
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.name = "monochrome",
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.description = NULL_IF_CONFIG_SMALL("Convert video to gray using custom color filter."),
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.priv_size = sizeof(MonochromeContext),
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.priv_class = &monochrome_class,
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FILTER_INPUTS(monochrome_inputs),
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FILTER_OUTPUTS(monochrome_outputs),
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FILTER_PIXFMTS_ARRAY(pixel_fmts),
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
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.process_command = ff_filter_process_command,
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};
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