mirror of https://github.com/FFmpeg/FFmpeg.git
This filter is based on the MPlayer decimate filter by Rich Felker.pull/28/head
Stefano Sabatini
13 years ago
parent
6c0107822d
commit
9dd3d6c72a
7 changed files with 312 additions and 2 deletions
@ -0,0 +1,268 @@ |
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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 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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