LCOV - code coverage report
Current view: top level - libavfilter - vf_mpdecimate.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 67 76 88.2 %
Date: 2017-12-16 13:57:32 Functions: 7 7 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2003 Rich Felker
       3             :  * Copyright (c) 2012 Stefano Sabatini
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or modify
       8             :  * it under the terms of the GNU General Public License as published by
       9             :  * the Free Software Foundation; either version 2 of the License, or
      10             :  * (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      15             :  * GNU General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU General Public License along
      18             :  * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
      19             :  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
      20             :  */
      21             : 
      22             : /**
      23             :  * @file mpdecimate filter, ported from libmpcodecs/vf_decimate.c by
      24             :  * Rich Felker.
      25             :  */
      26             : 
      27             : #include "libavutil/opt.h"
      28             : #include "libavutil/pixdesc.h"
      29             : #include "libavutil/pixelutils.h"
      30             : #include "libavutil/timestamp.h"
      31             : #include "avfilter.h"
      32             : #include "internal.h"
      33             : #include "formats.h"
      34             : #include "video.h"
      35             : 
      36             : typedef struct DecimateContext {
      37             :     const AVClass *class;
      38             :     int lo, hi;                    ///< lower and higher threshold number of differences
      39             :                                    ///< values for 8x8 blocks
      40             : 
      41             :     float frac;                    ///< threshold of changed pixels over the total fraction
      42             : 
      43             :     int max_drop_count;            ///< if positive: maximum number of sequential frames to drop
      44             :                                    ///< if negative: minimum number of frames between two drops
      45             : 
      46             :     int drop_count;                ///< if positive: number of frames sequentially dropped
      47             :                                    ///< if negative: number of sequential frames which were not dropped
      48             : 
      49             :     int hsub, vsub;                ///< chroma subsampling values
      50             :     AVFrame *ref;                  ///< reference picture
      51             :     av_pixelutils_sad_fn sad;      ///< sum of absolute difference function
      52             : } DecimateContext;
      53             : 
      54             : #define OFFSET(x) offsetof(DecimateContext, x)
      55             : #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
      56             : 
      57             : static const AVOption mpdecimate_options[] = {
      58             :     { "max",  "set the maximum number of consecutive dropped frames (positive), or the minimum interval between dropped frames (negative)",
      59             :       OFFSET(max_drop_count), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, FLAGS },
      60             :     { "hi",   "set high dropping threshold", OFFSET(hi), AV_OPT_TYPE_INT, {.i64=64*12}, INT_MIN, INT_MAX, FLAGS },
      61             :     { "lo",   "set low dropping threshold", OFFSET(lo), AV_OPT_TYPE_INT, {.i64=64*5}, INT_MIN, INT_MAX, FLAGS },
      62             :     { "frac", "set fraction dropping threshold",  OFFSET(frac), AV_OPT_TYPE_FLOAT, {.dbl=0.33}, 0, 1, FLAGS },
      63             :     { NULL }
      64             : };
      65             : 
      66             : AVFILTER_DEFINE_CLASS(mpdecimate);
      67             : 
      68             : /**
      69             :  * Return 1 if the two planes are different, 0 otherwise.
      70             :  */
      71          48 : static int diff_planes(AVFilterContext *ctx,
      72             :                        uint8_t *cur, int cur_linesize,
      73             :                        uint8_t *ref, int ref_linesize,
      74             :                        int w, int h)
      75             : {
      76          48 :     DecimateContext *decimate = ctx->priv;
      77             : 
      78             :     int x, y;
      79          48 :     int d, c = 0;
      80          48 :     int t = (w/16)*(h/16)*decimate->frac;
      81             : 
      82             :     /* compute difference for blocks of 8x8 bytes */
      83        1228 :     for (y = 0; y < h-7; y += 4) {
      84       69223 :         for (x = 8; x < w-7; x += 4) {
      85      136086 :             d = decimate->sad(cur + y*cur_linesize + x, cur_linesize,
      86       68043 :                               ref + y*ref_linesize + x, ref_linesize);
      87       68043 :             if (d > decimate->hi) {
      88          18 :                 av_log(ctx, AV_LOG_DEBUG, "%d>=hi ", d);
      89          18 :                 return 1;
      90             :             }
      91       68025 :             if (d > decimate->lo) {
      92          41 :                 c++;
      93          41 :                 if (c > t) {
      94           0 :                     av_log(ctx, AV_LOG_DEBUG, "lo:%d>=%d ", c, t);
      95           0 :                     return 1;
      96             :                 }
      97             :             }
      98             :         }
      99             :     }
     100             : 
     101          30 :     av_log(ctx, AV_LOG_DEBUG, "lo:%d<%d ", c, t);
     102          30 :     return 0;
     103             : }
     104             : 
     105             : /**
     106             :  * Tell if the frame should be decimated, for example if it is no much
     107             :  * different with respect to the reference frame ref.
     108             :  */
     109          28 : static int decimate_frame(AVFilterContext *ctx,
     110             :                           AVFrame *cur, AVFrame *ref)
     111             : {
     112          28 :     DecimateContext *decimate = ctx->priv;
     113             :     int plane;
     114             : 
     115          28 :     if (decimate->max_drop_count > 0 &&
     116           0 :         decimate->drop_count >= decimate->max_drop_count)
     117           0 :         return 0;
     118          28 :     if (decimate->max_drop_count < 0 &&
     119           0 :         (decimate->drop_count-1) > decimate->max_drop_count)
     120           0 :         return 0;
     121             : 
     122          58 :     for (plane = 0; ref->data[plane] && ref->linesize[plane]; plane++) {
     123             :         /* use 8x8 SAD even on subsampled planes.  The blocks won't match up with
     124             :          * luma blocks, but hopefully nobody is depending on this to catch
     125             :          * localized chroma changes that wouldn't exceed the thresholds when
     126             :          * diluted by using what's effectively a larger block size.
     127             :          */
     128          48 :         int vsub = plane == 1 || plane == 2 ? decimate->vsub : 0;
     129          48 :         int hsub = plane == 1 || plane == 2 ? decimate->hsub : 0;
     130          96 :         if (diff_planes(ctx,
     131             :                         cur->data[plane], cur->linesize[plane],
     132             :                         ref->data[plane], ref->linesize[plane],
     133          48 :                         AV_CEIL_RSHIFT(ref->width,  hsub),
     134          48 :                         AV_CEIL_RSHIFT(ref->height, vsub))) {
     135          18 :             emms_c();
     136          18 :             return 0;
     137             :         }
     138             :     }
     139             : 
     140          10 :     emms_c();
     141          10 :     return 1;
     142             : }
     143             : 
     144           2 : static av_cold int init(AVFilterContext *ctx)
     145             : {
     146           2 :     DecimateContext *decimate = ctx->priv;
     147             : 
     148           2 :     decimate->sad = av_pixelutils_get_sad_fn(3, 3, 0, ctx); // 8x8, not aligned on blocksize
     149           2 :     if (!decimate->sad)
     150           0 :         return AVERROR(EINVAL);
     151             : 
     152           2 :     av_log(ctx, AV_LOG_VERBOSE, "max_drop_count:%d hi:%d lo:%d frac:%f\n",
     153           2 :            decimate->max_drop_count, decimate->hi, decimate->lo, decimate->frac);
     154             : 
     155           2 :     return 0;
     156             : }
     157             : 
     158           2 : static av_cold void uninit(AVFilterContext *ctx)
     159             : {
     160           2 :     DecimateContext *decimate = ctx->priv;
     161           2 :     av_frame_free(&decimate->ref);
     162           2 : }
     163             : 
     164           1 : static int query_formats(AVFilterContext *ctx)
     165             : {
     166             :     static const enum AVPixelFormat pix_fmts[] = {
     167             :         AV_PIX_FMT_YUV444P,      AV_PIX_FMT_YUV422P,
     168             :         AV_PIX_FMT_YUV420P,      AV_PIX_FMT_YUV411P,
     169             :         AV_PIX_FMT_YUV410P,      AV_PIX_FMT_YUV440P,
     170             :         AV_PIX_FMT_YUVJ444P,     AV_PIX_FMT_YUVJ422P,
     171             :         AV_PIX_FMT_YUVJ420P,     AV_PIX_FMT_YUVJ440P,
     172             :         AV_PIX_FMT_YUVA420P,
     173             : 
     174             :         AV_PIX_FMT_GBRP,
     175             : 
     176             :         AV_PIX_FMT_YUVA444P,
     177             :         AV_PIX_FMT_YUVA422P,
     178             : 
     179             :         AV_PIX_FMT_NONE
     180             :     };
     181           1 :     AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
     182           1 :     if (!fmts_list)
     183           0 :         return AVERROR(ENOMEM);
     184           1 :     return ff_set_common_formats(ctx, fmts_list);
     185             : }
     186             : 
     187           1 : static int config_input(AVFilterLink *inlink)
     188             : {
     189           1 :     AVFilterContext *ctx = inlink->dst;
     190           1 :     DecimateContext *decimate = ctx->priv;
     191           1 :     const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
     192           1 :     decimate->hsub = pix_desc->log2_chroma_w;
     193           1 :     decimate->vsub = pix_desc->log2_chroma_h;
     194             : 
     195           1 :     return 0;
     196             : }
     197             : 
     198          29 : static int filter_frame(AVFilterLink *inlink, AVFrame *cur)
     199             : {
     200          29 :     DecimateContext *decimate = inlink->dst->priv;
     201          29 :     AVFilterLink *outlink = inlink->dst->outputs[0];
     202             :     int ret;
     203             : 
     204          29 :     if (decimate->ref && decimate_frame(inlink->dst, cur, decimate->ref)) {
     205          10 :         decimate->drop_count = FFMAX(1, decimate->drop_count+1);
     206             :     } else {
     207          19 :         av_frame_free(&decimate->ref);
     208          19 :         decimate->ref = cur;
     209          19 :         decimate->drop_count = FFMIN(-1, decimate->drop_count-1);
     210             : 
     211          19 :         if ((ret = ff_filter_frame(outlink, av_frame_clone(cur))) < 0)
     212           0 :             return ret;
     213             :     }
     214             : 
     215         174 :     av_log(inlink->dst, AV_LOG_DEBUG,
     216             :            "%s pts:%s pts_time:%s drop_count:%d\n",
     217          29 :            decimate->drop_count > 0 ? "drop" : "keep",
     218         116 :            av_ts2str(cur->pts), av_ts2timestr(cur->pts, &inlink->time_base),
     219             :            decimate->drop_count);
     220             : 
     221          29 :     if (decimate->drop_count > 0)
     222          10 :         av_frame_free(&cur);
     223             : 
     224          29 :     return 0;
     225             : }
     226             : 
     227             : static const AVFilterPad mpdecimate_inputs[] = {
     228             :     {
     229             :         .name         = "default",
     230             :         .type         = AVMEDIA_TYPE_VIDEO,
     231             :         .config_props = config_input,
     232             :         .filter_frame = filter_frame,
     233             :     },
     234             :     { NULL }
     235             : };
     236             : 
     237             : static const AVFilterPad mpdecimate_outputs[] = {
     238             :     {
     239             :         .name          = "default",
     240             :         .type          = AVMEDIA_TYPE_VIDEO,
     241             :     },
     242             :     { NULL }
     243             : };
     244             : 
     245             : AVFilter ff_vf_mpdecimate = {
     246             :     .name          = "mpdecimate",
     247             :     .description   = NULL_IF_CONFIG_SMALL("Remove near-duplicate frames."),
     248             :     .init          = init,
     249             :     .uninit        = uninit,
     250             :     .priv_size     = sizeof(DecimateContext),
     251             :     .priv_class    = &mpdecimate_class,
     252             :     .query_formats = query_formats,
     253             :     .inputs        = mpdecimate_inputs,
     254             :     .outputs       = mpdecimate_outputs,
     255             : };

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