7777e5119a
The cropdetect filter, at present, skips the first two frames. This behaviour is hardcoded. New option 'skip' allows users to change this. Convenient for when input is a single image or a trimmed video stream. Default is kept at 2 to preserve current behaviour.
288 lines
9.4 KiB
C
288 lines
9.4 KiB
C
/*
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* Copyright (c) 2002 A'rpi
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/**
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* @file
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* border detection filter
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* Ported from MPlayer libmpcodecs/vf_cropdetect.c.
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*/
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#include "libavutil/imgutils.h"
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#include "libavutil/internal.h"
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#include "libavutil/opt.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 CropDetectContext {
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const AVClass *class;
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int x1, y1, x2, y2;
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float limit;
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int round;
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int skip;
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int reset_count;
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int frame_nb;
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int max_pixsteps[4];
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int max_outliers;
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} CropDetectContext;
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P,
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AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVJ422P,
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P,
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AV_PIX_FMT_YUV411P, AV_PIX_FMT_GRAY8,
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AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV410P,
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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_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12,
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AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
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AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
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AV_PIX_FMT_NV12, AV_PIX_FMT_NV21,
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AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
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AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA,
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AV_PIX_FMT_NONE
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};
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AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
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if (!fmts_list)
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return AVERROR(ENOMEM);
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return ff_set_common_formats(ctx, fmts_list);
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}
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static int checkline(void *ctx, const unsigned char *src, int stride, int len, int bpp)
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{
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int total = 0;
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int div = len;
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const uint16_t *src16 = (const uint16_t *)src;
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switch (bpp) {
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case 1:
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while (len >= 8) {
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total += src[ 0] + src[ stride] + src[2*stride] + src[3*stride]
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+ src[4*stride] + src[5*stride] + src[6*stride] + src[7*stride];
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src += 8*stride;
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len -= 8;
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}
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while (--len >= 0) {
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total += src[0];
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src += stride;
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}
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break;
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case 2:
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stride >>= 1;
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while (len >= 8) {
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total += src16[ 0] + src16[ stride] + src16[2*stride] + src16[3*stride]
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+ src16[4*stride] + src16[5*stride] + src16[6*stride] + src16[7*stride];
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src16 += 8*stride;
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len -= 8;
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}
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while (--len >= 0) {
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total += src16[0];
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src16 += stride;
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}
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break;
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case 3:
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case 4:
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while (len >= 4) {
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total += src[0] + src[1 ] + src[2 ]
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+ src[ stride] + src[1+ stride] + src[2+ stride]
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+ src[2*stride] + src[1+2*stride] + src[2+2*stride]
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+ src[3*stride] + src[1+3*stride] + src[2+3*stride];
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src += 4*stride;
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len -= 4;
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}
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while (--len >= 0) {
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total += src[0] + src[1] + src[2];
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src += stride;
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}
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div *= 3;
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break;
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}
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total /= div;
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av_log(ctx, AV_LOG_DEBUG, "total:%d\n", total);
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return total;
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}
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static av_cold int init(AVFilterContext *ctx)
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{
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CropDetectContext *s = ctx->priv;
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s->frame_nb = -1 * s->skip;
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av_log(ctx, AV_LOG_VERBOSE, "limit:%f round:%d skip:%d reset_count:%d\n",
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s->limit, s->round, s->skip, s->reset_count);
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return 0;
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}
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static int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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CropDetectContext *s = ctx->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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av_image_fill_max_pixsteps(s->max_pixsteps, NULL, desc);
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if (s->limit < 1.0)
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s->limit *= (1 << desc->comp[0].depth) - 1;
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s->x1 = inlink->w - 1;
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s->y1 = inlink->h - 1;
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s->x2 = 0;
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s->y2 = 0;
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return 0;
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}
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#define SET_META(key, value) \
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av_dict_set_int(metadata, key, value, 0)
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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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CropDetectContext *s = ctx->priv;
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int bpp = s->max_pixsteps[0];
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int w, h, x, y, shrink_by;
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AVDictionary **metadata;
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int outliers, last_y;
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int limit = lrint(s->limit);
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// ignore first s->skip frames
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if (++s->frame_nb > 0) {
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metadata = &frame->metadata;
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// Reset the crop area every reset_count frames, if reset_count is > 0
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if (s->reset_count > 0 && s->frame_nb > s->reset_count) {
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s->x1 = frame->width - 1;
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s->y1 = frame->height - 1;
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s->x2 = 0;
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s->y2 = 0;
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s->frame_nb = 1;
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}
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#define FIND(DST, FROM, NOEND, INC, STEP0, STEP1, LEN) \
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outliers = 0;\
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for (last_y = y = FROM; NOEND; y = y INC) {\
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if (checkline(ctx, frame->data[0] + STEP0 * y, STEP1, LEN, bpp) > limit) {\
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if (++outliers > s->max_outliers) { \
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DST = last_y;\
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break;\
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}\
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} else\
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last_y = y INC;\
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}
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FIND(s->y1, 0, y < s->y1, +1, frame->linesize[0], bpp, frame->width);
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FIND(s->y2, frame->height - 1, y > FFMAX(s->y2, s->y1), -1, frame->linesize[0], bpp, frame->width);
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FIND(s->x1, 0, y < s->x1, +1, bpp, frame->linesize[0], frame->height);
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FIND(s->x2, frame->width - 1, y > FFMAX(s->x2, s->x1), -1, bpp, frame->linesize[0], frame->height);
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// round x and y (up), important for yuv colorspaces
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// make sure they stay rounded!
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x = (s->x1+1) & ~1;
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y = (s->y1+1) & ~1;
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w = s->x2 - x + 1;
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h = s->y2 - y + 1;
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// w and h must be divisible by 2 as well because of yuv
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// colorspace problems.
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if (s->round <= 1)
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s->round = 16;
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if (s->round % 2)
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s->round *= 2;
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shrink_by = w % s->round;
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w -= shrink_by;
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x += (shrink_by/2 + 1) & ~1;
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shrink_by = h % s->round;
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h -= shrink_by;
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y += (shrink_by/2 + 1) & ~1;
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SET_META("lavfi.cropdetect.x1", s->x1);
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SET_META("lavfi.cropdetect.x2", s->x2);
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SET_META("lavfi.cropdetect.y1", s->y1);
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SET_META("lavfi.cropdetect.y2", s->y2);
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SET_META("lavfi.cropdetect.w", w);
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SET_META("lavfi.cropdetect.h", h);
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SET_META("lavfi.cropdetect.x", x);
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SET_META("lavfi.cropdetect.y", y);
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av_log(ctx, AV_LOG_INFO,
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"x1:%d x2:%d y1:%d y2:%d w:%d h:%d x:%d y:%d pts:%"PRId64" t:%f crop=%d:%d:%d:%d\n",
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s->x1, s->x2, s->y1, s->y2, w, h, x, y, frame->pts,
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frame->pts == AV_NOPTS_VALUE ? -1 : frame->pts * av_q2d(inlink->time_base),
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w, h, x, y);
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}
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return ff_filter_frame(inlink->dst->outputs[0], frame);
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}
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#define OFFSET(x) offsetof(CropDetectContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption cropdetect_options[] = {
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{ "limit", "Threshold below which the pixel is considered black", OFFSET(limit), AV_OPT_TYPE_FLOAT, { .dbl = 24.0/255 }, 0, 65535, FLAGS },
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{ "round", "Value by which the width/height should be divisible", OFFSET(round), AV_OPT_TYPE_INT, { .i64 = 16 }, 0, INT_MAX, FLAGS },
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{ "reset", "Recalculate the crop area after this many frames", OFFSET(reset_count), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
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{ "skip", "Number of initial frames to skip", OFFSET(skip), AV_OPT_TYPE_INT, { .i64 = 2 }, 0, INT_MAX, FLAGS },
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{ "reset_count", "Recalculate the crop area after this many frames",OFFSET(reset_count),AV_OPT_TYPE_INT,{ .i64 = 0 }, 0, INT_MAX, FLAGS },
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{ "max_outliers", "Threshold count of outliers", OFFSET(max_outliers),AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(cropdetect);
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static const AVFilterPad avfilter_vf_cropdetect_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_input,
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.filter_frame = filter_frame,
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},
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{ NULL }
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};
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static const AVFilterPad avfilter_vf_cropdetect_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO
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},
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{ NULL }
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};
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AVFilter ff_vf_cropdetect = {
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.name = "cropdetect",
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.description = NULL_IF_CONFIG_SMALL("Auto-detect crop size."),
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.priv_size = sizeof(CropDetectContext),
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.priv_class = &cropdetect_class,
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.init = init,
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.query_formats = query_formats,
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.inputs = avfilter_vf_cropdetect_inputs,
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.outputs = avfilter_vf_cropdetect_outputs,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
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};
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