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/* |
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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/pixdesc.h" |
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#include "avfilter.h" |
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#include "filters.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 ptrdiff_t ylinesize = frame->linesize[0]; |
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const ptrdiff_t ulinesize = frame->linesize[1]; |
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const ptrdiff_t 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 ptrdiff_t ylinesize = frame->linesize[0] / 2; |
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const ptrdiff_t ulinesize = frame->linesize[1] / 2; |
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const ptrdiff_t 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 ptrdiff_t ulinesize = frame->linesize[1]; |
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const ptrdiff_t 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 ptrdiff_t ulinesize = frame->linesize[1] / 2; |
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const ptrdiff_t 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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#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(ff_video_default_filterpad), |
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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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