256 lines
8.4 KiB
C
256 lines
8.4 KiB
C
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/*
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* Copyright (c) 2003 Rich Felker
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* Copyright (c) 2012 Stefano Sabatini
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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 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 mpdecimate filter, ported from libmpcodecs/vf_decimate.c by
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* Rich Felker.
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*/
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/pixelutils.h"
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#include "libavutil/timestamp.h"
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#include "avfilter.h"
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#include "internal.h"
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#include "formats.h"
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#include "video.h"
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typedef struct DecimateContext {
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const AVClass *class;
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int lo, hi; ///< lower and higher threshold number of differences
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///< values for 8x8 blocks
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float frac; ///< threshold of changed pixels over the total fraction
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int max_drop_count; ///< if positive: maximum number of sequential frames to drop
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///< if negative: minimum number of frames between two drops
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int drop_count; ///< if positive: number of frames sequentially dropped
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///< if negative: number of sequential frames which were not dropped
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int hsub, vsub; ///< chroma subsampling values
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AVFrame *ref; ///< reference picture
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av_pixelutils_sad_fn sad; ///< sum of absolute difference function
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} DecimateContext;
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#define OFFSET(x) offsetof(DecimateContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption mpdecimate_options[] = {
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{ "max", "set the maximum number of consecutive dropped frames (positive), or the minimum interval between dropped frames (negative)",
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OFFSET(max_drop_count), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, FLAGS },
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{ "hi", "set high dropping threshold", OFFSET(hi), AV_OPT_TYPE_INT, {.i64=64*12}, INT_MIN, INT_MAX, FLAGS },
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{ "lo", "set low dropping threshold", OFFSET(lo), AV_OPT_TYPE_INT, {.i64=64*5}, INT_MIN, INT_MAX, FLAGS },
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{ "frac", "set fraction dropping threshold", OFFSET(frac), AV_OPT_TYPE_FLOAT, {.dbl=0.33}, 0, 1, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(mpdecimate);
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/**
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* Return 1 if the two planes are different, 0 otherwise.
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*/
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static int diff_planes(AVFilterContext *ctx,
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uint8_t *cur, int cur_linesize,
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uint8_t *ref, int ref_linesize,
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int w, int h)
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{
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DecimateContext *decimate = ctx->priv;
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int x, y;
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int d, c = 0;
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int t = (w/16)*(h/16)*decimate->frac;
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/* compute difference for blocks of 8x8 bytes */
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for (y = 0; y < h-7; y += 4) {
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for (x = 8; x < w-7; x += 4) {
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d = decimate->sad(cur + y*cur_linesize + x, cur_linesize,
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ref + y*ref_linesize + x, ref_linesize);
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if (d > decimate->hi) {
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av_log(ctx, AV_LOG_DEBUG, "%d>=hi ", d);
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return 1;
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}
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if (d > decimate->lo) {
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c++;
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if (c > t) {
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av_log(ctx, AV_LOG_DEBUG, "lo:%d>=%d ", c, t);
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return 1;
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}
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}
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}
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}
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av_log(ctx, AV_LOG_DEBUG, "lo:%d<%d ", c, t);
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return 0;
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}
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/**
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* Tell if the frame should be decimated, for example if it is no much
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* different with respect to the reference frame ref.
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*/
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static int decimate_frame(AVFilterContext *ctx,
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AVFrame *cur, AVFrame *ref)
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{
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DecimateContext *decimate = ctx->priv;
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int plane;
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if (decimate->max_drop_count > 0 &&
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decimate->drop_count >= decimate->max_drop_count)
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return 0;
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if (decimate->max_drop_count < 0 &&
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(decimate->drop_count-1) > decimate->max_drop_count)
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return 0;
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for (plane = 0; ref->data[plane] && ref->linesize[plane]; plane++) {
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/* use 8x8 SAD even on subsampled planes. The blocks won't match up with
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* luma blocks, but hopefully nobody is depending on this to catch
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* localized chroma changes that wouldn't exceed the thresholds when
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* diluted by using what's effectively a larger block size.
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*/
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int vsub = plane == 1 || plane == 2 ? decimate->vsub : 0;
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int hsub = plane == 1 || plane == 2 ? decimate->hsub : 0;
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if (diff_planes(ctx,
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cur->data[plane], cur->linesize[plane],
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ref->data[plane], ref->linesize[plane],
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AV_CEIL_RSHIFT(ref->width, hsub),
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AV_CEIL_RSHIFT(ref->height, vsub))) {
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emms_c();
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return 0;
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}
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}
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emms_c();
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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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DecimateContext *decimate = ctx->priv;
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decimate->sad = av_pixelutils_get_sad_fn(3, 3, 0, ctx); // 8x8, not aligned on blocksize
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if (!decimate->sad)
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return AVERROR(EINVAL);
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av_log(ctx, AV_LOG_VERBOSE, "max_drop_count:%d hi:%d lo:%d frac:%f\n",
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decimate->max_drop_count, decimate->hi, decimate->lo, decimate->frac);
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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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DecimateContext *decimate = ctx->priv;
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av_frame_free(&decimate->ref);
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}
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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_YUV444P, AV_PIX_FMT_YUV422P,
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
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AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
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AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
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AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ440P,
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AV_PIX_FMT_YUVA420P,
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AV_PIX_FMT_GBRP,
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AV_PIX_FMT_YUVA444P,
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AV_PIX_FMT_YUVA422P,
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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 config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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DecimateContext *decimate = ctx->priv;
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const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
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decimate->hsub = pix_desc->log2_chroma_w;
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decimate->vsub = pix_desc->log2_chroma_h;
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *cur)
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{
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DecimateContext *decimate = inlink->dst->priv;
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AVFilterLink *outlink = inlink->dst->outputs[0];
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int ret;
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if (decimate->ref && decimate_frame(inlink->dst, cur, decimate->ref)) {
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decimate->drop_count = FFMAX(1, decimate->drop_count+1);
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} else {
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av_frame_free(&decimate->ref);
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decimate->ref = cur;
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decimate->drop_count = FFMIN(-1, decimate->drop_count-1);
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if ((ret = ff_filter_frame(outlink, av_frame_clone(cur))) < 0)
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return ret;
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}
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av_log(inlink->dst, AV_LOG_DEBUG,
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"%s pts:%s pts_time:%s drop_count:%d\n",
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decimate->drop_count > 0 ? "drop" : "keep",
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av_ts2str(cur->pts), av_ts2timestr(cur->pts, &inlink->time_base),
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decimate->drop_count);
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if (decimate->drop_count > 0)
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av_frame_free(&cur);
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return 0;
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}
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static const AVFilterPad mpdecimate_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 mpdecimate_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_mpdecimate = {
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.name = "mpdecimate",
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.description = NULL_IF_CONFIG_SMALL("Remove near-duplicate frames."),
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.init = init,
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.uninit = uninit,
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.priv_size = sizeof(DecimateContext),
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.priv_class = &mpdecimate_class,
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.query_formats = query_formats,
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.inputs = mpdecimate_inputs,
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.outputs = mpdecimate_outputs,
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};
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