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510 lines
18 KiB
510 lines
18 KiB
/* |
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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/mem.h" |
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#include "libavutil/opt.h" |
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#include "libavutil/motion_vector.h" |
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#include "libavutil/qsort.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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#include "edge_common.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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float limit_upscaled; |
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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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int mode; |
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int window_size; |
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int mv_threshold; |
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int bitdepth; |
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float low, high; |
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uint8_t low_u8, high_u8; |
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uint8_t *filterbuf; |
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uint8_t *tmpbuf; |
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uint16_t *gradients; |
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char *directions; |
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int *bboxes[4]; |
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} CropDetectContext; |
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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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enum CropMode { |
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MODE_BLACK, |
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MODE_MV_EDGES, |
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MODE_NB |
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}; |
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static int comp(const int *a,const int *b) |
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{ |
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return FFDIFFSIGN(*a, *b); |
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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 int checkline_edge(void *ctx, const unsigned char *src, int stride, int len, int bpp) |
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{ |
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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 >= 0) { |
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if (src[0]) return 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 >= 0) { |
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if (src16[0]) return 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 >= 0) { |
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if (src[0] || src[1] || src[2]) return 0; |
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src += stride; |
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} |
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break; |
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} |
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return 1; |
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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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s->low_u8 = s->low * 255. + .5; |
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s->high_u8 = s->high * 255. + .5; |
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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 av_cold void uninit(AVFilterContext *ctx) |
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{ |
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CropDetectContext *s = ctx->priv; |
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av_freep(&s->tmpbuf); |
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av_freep(&s->filterbuf); |
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av_freep(&s->gradients); |
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av_freep(&s->directions); |
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av_freep(&s->bboxes[0]); |
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av_freep(&s->bboxes[1]); |
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av_freep(&s->bboxes[2]); |
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av_freep(&s->bboxes[3]); |
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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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const int bufsize = inlink->w * inlink->h; |
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av_image_fill_max_pixsteps(s->max_pixsteps, NULL, desc); |
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s->bitdepth = desc->comp[0].depth; |
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if (s->limit < 1.0) |
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s->limit_upscaled = s->limit * ((1 << s->bitdepth) - 1); |
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else |
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s->limit_upscaled = s->limit; |
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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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s->window_size = FFMAX(s->reset_count, 15); |
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s->tmpbuf = av_malloc(bufsize); |
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s->filterbuf = av_malloc(bufsize * s->max_pixsteps[0]); |
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s->gradients = av_calloc(bufsize, sizeof(*s->gradients)); |
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s->directions = av_malloc(bufsize); |
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s->bboxes[0] = av_malloc(s->window_size * sizeof(*s->bboxes[0])); |
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s->bboxes[1] = av_malloc(s->window_size * sizeof(*s->bboxes[1])); |
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s->bboxes[2] = av_malloc(s->window_size * sizeof(*s->bboxes[2])); |
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s->bboxes[3] = av_malloc(s->window_size * sizeof(*s->bboxes[3])); |
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if (!s->tmpbuf || !s->filterbuf || !s->gradients || !s->directions || |
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!s->bboxes[0] || !s->bboxes[1] || !s->bboxes[2] || !s->bboxes[3]) |
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return AVERROR(ENOMEM); |
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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, i; |
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AVDictionary **metadata; |
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int outliers, last_y; |
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int limit_upscaled = lrint(s->limit_upscaled); |
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char limit_str[22]; |
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const int inw = inlink->w; |
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const int inh = inlink->h; |
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uint8_t *tmpbuf = s->tmpbuf; |
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uint8_t *filterbuf = s->filterbuf; |
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uint16_t *gradients = s->gradients; |
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int8_t *directions = s->directions; |
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const AVFrameSideData *sd = NULL; |
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int scan_w, scan_h, bboff; |
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void (*sobel)(int w, int h, uint16_t *dst, int dst_linesize, |
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int8_t *dir, int dir_linesize, |
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const uint8_t *src, int src_linesize, int src_stride) = (bpp == 2) ? &ff_sobel_16 : &ff_sobel_8; |
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void (*gaussian_blur)(int w, int h, |
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uint8_t *dst, int dst_linesize, |
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const uint8_t *src, int src_linesize, int src_stride) = (bpp == 2) ? &ff_gaussian_blur_16 : &ff_gaussian_blur_8; |
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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_upscaled) {\ |
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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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if (s->mode == MODE_BLACK) { |
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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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} else { // MODE_MV_EDGES |
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sd = av_frame_get_side_data(frame, AV_FRAME_DATA_MOTION_VECTORS); |
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s->x1 = 0; |
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s->y1 = 0; |
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s->x2 = inw - 1; |
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s->y2 = inh - 1; |
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if (!sd) { |
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av_log(ctx, AV_LOG_WARNING, "Cannot detect: no motion vectors available"); |
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} else { |
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// gaussian filter to reduce noise |
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gaussian_blur(inw, inh, |
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filterbuf, inw*bpp, |
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frame->data[0], frame->linesize[0], bpp); |
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// compute the 16-bits gradients and directions for the next step |
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sobel(inw, inh, gradients, inw, directions, inw, filterbuf, inw*bpp, bpp); |
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// non_maximum_suppression() will actually keep & clip what's necessary and |
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// ignore the rest, so we need a clean output buffer |
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memset(tmpbuf, 0, inw * inh); |
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ff_non_maximum_suppression(inw, inh, tmpbuf, inw, directions, inw, gradients, inw); |
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// keep high values, or low values surrounded by high values |
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ff_double_threshold(s->low_u8, s->high_u8, inw, inh, |
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tmpbuf, inw, tmpbuf, inw); |
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// scan all MVs and store bounding box |
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s->x1 = inw - 1; |
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s->y1 = inh - 1; |
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s->x2 = 0; |
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s->y2 = 0; |
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for (i = 0; i < sd->size / sizeof(AVMotionVector); i++) { |
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const AVMotionVector *mv = (const AVMotionVector*)sd->data + i; |
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const int mx = mv->dst_x - mv->src_x; |
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const int my = mv->dst_y - mv->src_y; |
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if (mv->dst_x >= 0 && mv->dst_x < inw && |
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mv->dst_y >= 0 && mv->dst_y < inh && |
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mv->src_x >= 0 && mv->src_x < inw && |
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mv->src_y >= 0 && mv->src_y < inh && |
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mx * mx + my * my >= s->mv_threshold * s->mv_threshold) { |
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s->x1 = mv->dst_x < s->x1 ? mv->dst_x : s->x1; |
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s->y1 = mv->dst_y < s->y1 ? mv->dst_y : s->y1; |
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s->x2 = mv->dst_x > s->x2 ? mv->dst_x : s->x2; |
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s->y2 = mv->dst_y > s->y2 ? mv->dst_y : s->y2; |
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} |
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} |
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// assert x1<x2, y1<y2 |
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if (s->x1 > s->x2) FFSWAP(int, s->x1, s->x2); |
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if (s->y1 > s->y2) FFSWAP(int, s->y1, s->y2); |
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// scan outward looking for 0-edge-lines in edge image |
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scan_w = s->x2 - s->x1; |
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scan_h = s->y2 - s->y1; |
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#define FIND_EDGE(DST, FROM, NOEND, INC, STEP0, STEP1, LEN) \ |
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for (last_y = y = FROM; NOEND; y = y INC) { \ |
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if (checkline_edge(ctx, tmpbuf + STEP0 * y, STEP1, LEN, bpp)) { \ |
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if (last_y INC == y) { \ |
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DST = y; \ |
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break; \ |
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} else \ |
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last_y = y; \ |
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} \ |
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} \ |
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if (!(NOEND)) { \ |
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DST = y -(INC); \ |
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} |
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FIND_EDGE(s->y1, s->y1, y >= 0, -1, inw, bpp, scan_w); |
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FIND_EDGE(s->y2, s->y2, y < inh, +1, inw, bpp, scan_w); |
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FIND_EDGE(s->x1, s->x1, y >= 0, -1, bpp, inw, scan_h); |
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FIND_EDGE(s->x2, s->x2, y < inw, +1, bpp, inw, scan_h); |
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// queue bboxes |
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bboff = (s->frame_nb - 1) % s->window_size; |
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s->bboxes[0][bboff] = s->x1; |
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s->bboxes[1][bboff] = s->x2; |
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s->bboxes[2][bboff] = s->y1; |
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s->bboxes[3][bboff] = s->y2; |
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// sort queue |
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bboff = FFMIN(s->frame_nb, s->window_size); |
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AV_QSORT(s->bboxes[0], bboff, int, comp); |
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AV_QSORT(s->bboxes[1], bboff, int, comp); |
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AV_QSORT(s->bboxes[2], bboff, int, comp); |
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AV_QSORT(s->bboxes[3], bboff, int, comp); |
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// return median of window_size elems |
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s->x1 = s->bboxes[0][bboff/2]; |
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s->x2 = s->bboxes[1][bboff/2]; |
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s->y1 = s->bboxes[2][bboff/2]; |
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s->y2 = s->bboxes[3][bboff/2]; |
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} |
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} |
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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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snprintf(limit_str, sizeof(limit_str), "%f", s->limit); |
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av_dict_set(metadata, "lavfi.cropdetect.limit", limit_str, 0); |
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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 limit:%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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s->limit, 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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static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, |
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char *res, int res_len, int flags) |
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{ |
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CropDetectContext *s = ctx->priv; |
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float old_limit = s->limit; |
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int ret; |
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if ((ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags)) < 0) |
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return ret; |
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if (old_limit != s->limit) { |
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if (s->limit < 1.0) |
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s->limit_upscaled = s->limit * ((1 << s->bitdepth) - 1); |
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else |
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s->limit_upscaled = s->limit; |
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s->frame_nb = s->reset_count; |
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} |
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return 0; |
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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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#define TFLAGS AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_RUNTIME_PARAM |
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|
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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, TFLAGS }, |
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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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{ "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_BLACK}, 0, MODE_NB-1, FLAGS, .unit = "mode" }, |
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{ "black", "detect black pixels surrounding the video", 0, AV_OPT_TYPE_CONST, {.i64=MODE_BLACK}, INT_MIN, INT_MAX, FLAGS, .unit = "mode" }, |
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{ "mvedges", "detect motion and edged surrounding the video", 0, AV_OPT_TYPE_CONST, {.i64=MODE_MV_EDGES}, INT_MIN, INT_MAX, FLAGS, .unit = "mode" }, |
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{ "high", "Set high threshold for edge detection", OFFSET(high), AV_OPT_TYPE_FLOAT, {.dbl=25/255.}, 0, 1, FLAGS }, |
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{ "low", "Set low threshold for edge detection", OFFSET(low), AV_OPT_TYPE_FLOAT, {.dbl=15/255.}, 0, 1, FLAGS }, |
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{ "mv_threshold", "motion vector threshold when estimating video window size", OFFSET(mv_threshold), AV_OPT_TYPE_INT, {.i64=8}, 0, 100, FLAGS}, |
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{ NULL } |
|
}; |
|
|
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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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}; |
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|
|
const 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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.uninit = uninit, |
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FILTER_INPUTS(avfilter_vf_cropdetect_inputs), |
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FILTER_OUTPUTS(ff_video_default_filterpad), |
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FILTER_PIXFMTS_ARRAY(pix_fmts), |
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_METADATA_ONLY, |
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.process_command = process_command, |
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};
|
|
|