269 lines
8.6 KiB
C
269 lines
8.6 KiB
C
/*
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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 decimate filter, ported from libmpcodecs/vf_decimate.c by
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* Rich Felker.
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*/
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#include "libavutil/pixdesc.h"
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#include "libavutil/timestamp.h"
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#include "libavcodec/dsputil.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 {
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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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AVFilterBufferRef *ref; ///< reference picture
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DSPContext dspctx; ///< context providing optimized diff routines
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AVCodecContext *avctx; ///< codec context required for the DSPContext
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} DecimateContext;
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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, uint8_t *ref, int 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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DSPContext *dspctx = &decimate->dspctx;
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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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DCTELEM block[8*8];
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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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dspctx->diff_pixels(block,
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cur+x+y*linesize,
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ref+x+y*linesize, linesize);
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d = dspctx->sum_abs_dctelem(block);
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if (d > decimate->hi)
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return 1;
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if (d > decimate->lo) {
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c++;
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if (c > t)
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return 1;
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}
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}
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}
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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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AVFilterBufferRef *cur, AVFilterBufferRef *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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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], ref->data[plane], ref->linesize[plane],
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ref->video->w>>hsub, ref->video->h>>vsub))
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return 0;
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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, const char *args)
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{
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DecimateContext *decimate = ctx->priv;
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/* set default values */
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decimate->drop_count = decimate->max_drop_count = 0;
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decimate->lo = 64*5;
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decimate->hi = 64*12;
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decimate->frac = 0.33;
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if (args) {
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char c1, c2, c3, c4;
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int n = sscanf(args, "%d%c%d%c%d%c%f%c",
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&decimate->max_drop_count, &c1,
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&decimate->hi, &c2, &decimate->lo, &c3,
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&decimate->frac, &c4);
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if (n != 1 &&
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(n != 3 || c1 != ':') &&
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(n != 5 || c1 != ':' || c2 != ':') &&
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(n != 7 || c1 != ':' || c2 != ':' || c3 != ':')) {
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av_log(ctx, AV_LOG_ERROR,
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"Invalid syntax for argument '%s': "
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"must be in the form 'max:hi:lo:frac'\n", args);
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return AVERROR(EINVAL);
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}
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}
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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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decimate->avctx = avcodec_alloc_context3(NULL);
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if (!decimate->avctx)
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return AVERROR(ENOMEM);
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dsputil_init(&decimate->dspctx, decimate->avctx);
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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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avfilter_unref_bufferp(&decimate->ref);
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avcodec_close(decimate->avctx);
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av_freep(&decimate->avctx);
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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 PixelFormat pix_fmts[] = {
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PIX_FMT_YUV444P, PIX_FMT_YUV422P,
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PIX_FMT_YUV420P, PIX_FMT_YUV411P,
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PIX_FMT_YUV410P, PIX_FMT_YUV440P,
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PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P,
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PIX_FMT_YUVJ420P, PIX_FMT_YUVJ440P,
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PIX_FMT_YUVA420P,
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PIX_FMT_NONE
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};
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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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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DecimateContext *decimate = ctx->priv;
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const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[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 start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref) { return 0; }
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static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) { return 0; }
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static int end_frame(AVFilterLink *inlink)
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{
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DecimateContext *decimate = inlink->dst->priv;
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AVFilterBufferRef *cur = inlink->cur_buf;
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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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avfilter_unref_buffer(decimate->ref);
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decimate->ref = cur;
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inlink->cur_buf = NULL;
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decimate->drop_count = FFMIN(-1, decimate->drop_count-1);
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if ((ret = ff_start_frame(outlink,
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avfilter_ref_buffer(cur, ~AV_PERM_WRITE)) < 0) ||
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(ret = ff_draw_slice(outlink, 0, inlink->h, 1)) < 0 ||
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(ret = ff_end_frame(outlink)) < 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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return 0;
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}
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static int request_frame(AVFilterLink *outlink)
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{
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DecimateContext *decimate = outlink->src->priv;
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AVFilterLink *inlink = outlink->src->inputs[0];
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int ret;
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do {
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ret = ff_request_frame(inlink);
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} while (decimate->drop_count > 0 && ret >= 0);
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return ret;
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}
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AVFilter avfilter_vf_decimate = {
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.name = "decimate",
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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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.query_formats = query_formats,
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.inputs = (const AVFilterPad[]) {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.get_video_buffer = ff_null_get_video_buffer,
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.config_props = config_input,
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.start_frame = start_frame,
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.draw_slice = draw_slice,
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.end_frame = end_frame,
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.min_perms = AV_PERM_READ | AV_PERM_PRESERVE,
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},
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{ .name = NULL }
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},
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.outputs = (const AVFilterPad[]) {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.request_frame = request_frame,
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},
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{ .name = NULL }
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},
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};
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