LCOV - code coverage report
Current view: top level - libavfilter - vf_framestep.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 14 0.0 %
Date: 2017-12-13 10:57:33 Functions: 0 2 0.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2012 Stefano Sabatini
       3             :  *
       4             :  * This file is part of FFmpeg.
       5             :  *
       6             :  * FFmpeg is free software; you can redistribute it and/or
       7             :  * modify it under the terms of the GNU Lesser General Public
       8             :  * License as published by the Free Software Foundation; either
       9             :  * version 2.1 of the License, or (at your option) any later version.
      10             :  *
      11             :  * FFmpeg is distributed in the hope that it will be useful,
      12             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14             :  * Lesser General Public License for more details.
      15             :  *
      16             :  * You should have received a copy of the GNU Lesser General Public
      17             :  * License along with FFmpeg; if not, write to the Free Software
      18             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      19             :  */
      20             : 
      21             : /**
      22             :  * @file framestep filter, inspired on libmpcodecs/vf_framestep.c by
      23             :  * Daniele Fornighieri <guru AT digitalfantasy it>.
      24             :  */
      25             : 
      26             : #include "libavutil/opt.h"
      27             : #include "avfilter.h"
      28             : #include "internal.h"
      29             : #include "video.h"
      30             : 
      31             : typedef struct NullContext {
      32             :     const AVClass *class;
      33             :     int frame_step;
      34             : } FrameStepContext;
      35             : 
      36             : #define OFFSET(x) offsetof(FrameStepContext, x)
      37             : #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
      38             : 
      39             : static const AVOption framestep_options[] = {
      40             :     { "step", "set frame step",  OFFSET(frame_step), AV_OPT_TYPE_INT, {.i64=1}, 1, INT_MAX, FLAGS},
      41             :     { NULL },
      42             : };
      43             : 
      44             : AVFILTER_DEFINE_CLASS(framestep);
      45             : 
      46           0 : static int config_output_props(AVFilterLink *outlink)
      47             : {
      48           0 :     AVFilterContext *ctx = outlink->src;
      49           0 :     FrameStepContext *framestep = ctx->priv;
      50           0 :     AVFilterLink *inlink = ctx->inputs[0];
      51             : 
      52           0 :     outlink->frame_rate =
      53           0 :         av_div_q(inlink->frame_rate, (AVRational){framestep->frame_step, 1});
      54             : 
      55           0 :     av_log(ctx, AV_LOG_VERBOSE, "step:%d frame_rate:%d/%d(%f) -> frame_rate:%d/%d(%f)\n",
      56             :            framestep->frame_step,
      57             :            inlink->frame_rate.num, inlink->frame_rate.den, av_q2d(inlink->frame_rate),
      58             :            outlink->frame_rate.num, outlink->frame_rate.den, av_q2d(outlink->frame_rate));
      59           0 :     return 0;
      60             : }
      61             : 
      62           0 : static int filter_frame(AVFilterLink *inlink, AVFrame *ref)
      63             : {
      64           0 :     FrameStepContext *framestep = inlink->dst->priv;
      65             : 
      66           0 :     if (!(inlink->frame_count_out % framestep->frame_step)) {
      67           0 :         return ff_filter_frame(inlink->dst->outputs[0], ref);
      68             :     } else {
      69           0 :         av_frame_free(&ref);
      70           0 :         return 0;
      71             :     }
      72             : }
      73             : 
      74             : static const AVFilterPad framestep_inputs[] = {
      75             :     {
      76             :         .name         = "default",
      77             :         .type         = AVMEDIA_TYPE_VIDEO,
      78             :         .filter_frame = filter_frame,
      79             :     },
      80             :     { NULL }
      81             : };
      82             : 
      83             : static const AVFilterPad framestep_outputs[] = {
      84             :     {
      85             :         .name         = "default",
      86             :         .type         = AVMEDIA_TYPE_VIDEO,
      87             :         .config_props = config_output_props,
      88             :     },
      89             :     { NULL }
      90             : };
      91             : 
      92             : AVFilter ff_vf_framestep = {
      93             :     .name        = "framestep",
      94             :     .description = NULL_IF_CONFIG_SMALL("Select one frame every N frames."),
      95             :     .priv_size   = sizeof(FrameStepContext),
      96             :     .priv_class  = &framestep_class,
      97             :     .inputs      = framestep_inputs,
      98             :     .outputs     = framestep_outputs,
      99             :     .flags       = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
     100             : };

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