LCOV - code coverage report
Current view: top level - libavfilter - vf_field.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 20 20 100.0 %
Date: 2017-12-11 04:34:20 Functions: 2 2 100.0 %

          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
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (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 GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : /**
      23             :  * @file
      24             :  * field filter, based on libmpcodecs/vf_field.c by Rich Felker
      25             :  */
      26             : 
      27             : #include "libavutil/opt.h"
      28             : #include "libavutil/pixdesc.h"
      29             : #include "avfilter.h"
      30             : #include "internal.h"
      31             : 
      32             : enum FieldType { FIELD_TYPE_TOP = 0, FIELD_TYPE_BOTTOM };
      33             : 
      34             : typedef struct FieldContext {
      35             :     const AVClass *class;
      36             :     int type;                   ///< FieldType
      37             :     int nb_planes;              ///< number of planes of the current format
      38             : } FieldContext;
      39             : 
      40             : #define OFFSET(x) offsetof(FieldContext, x)
      41             : #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
      42             : 
      43             : static const AVOption field_options[] = {
      44             :     {"type", "set field type (top or bottom)", OFFSET(type), AV_OPT_TYPE_INT, {.i64=FIELD_TYPE_TOP}, 0, 1, FLAGS, "field_type" },
      45             :     {"top",    "select top field",    0, AV_OPT_TYPE_CONST, {.i64=FIELD_TYPE_TOP},    INT_MIN, INT_MAX, FLAGS, "field_type"},
      46             :     {"bottom", "select bottom field", 0, AV_OPT_TYPE_CONST, {.i64=FIELD_TYPE_BOTTOM}, INT_MIN, INT_MAX, FLAGS, "field_type"},
      47             :     {NULL}
      48             : };
      49             : 
      50             : AVFILTER_DEFINE_CLASS(field);
      51             : 
      52         141 : static int config_props_output(AVFilterLink *outlink)
      53             : {
      54         141 :     AVFilterContext *ctx = outlink->src;
      55         141 :     FieldContext *field = ctx->priv;
      56         141 :     AVFilterLink *inlink = ctx->inputs[0];
      57             : 
      58         141 :     field->nb_planes = av_pix_fmt_count_planes(outlink->format);
      59             : 
      60         141 :     outlink->w = inlink->w;
      61         141 :     outlink->h = (inlink->h + (field->type == FIELD_TYPE_TOP)) / 2;
      62             : 
      63         282 :     av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d type:%s -> w:%d h:%d\n",
      64         141 :            inlink->w, inlink->h, field->type == FIELD_TYPE_BOTTOM ? "bottom" : "top",
      65             :            outlink->w, outlink->h);
      66         141 :     return 0;
      67             : }
      68             : 
      69         141 : static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
      70             : {
      71         141 :     FieldContext *field = inlink->dst->priv;
      72         141 :     AVFilterLink *outlink = inlink->dst->outputs[0];
      73             :     int i;
      74             : 
      75         141 :     inpicref->height = outlink->h;
      76         141 :     inpicref->interlaced_frame = 0;
      77             : 
      78         482 :     for (i = 0; i < field->nb_planes; i++) {
      79         341 :         if (field->type == FIELD_TYPE_BOTTOM)
      80         341 :             inpicref->data[i] = inpicref->data[i] + inpicref->linesize[i];
      81         341 :         inpicref->linesize[i] = 2 * inpicref->linesize[i];
      82             :     }
      83         141 :     return ff_filter_frame(outlink, inpicref);
      84             : }
      85             : 
      86             : static const AVFilterPad field_inputs[] = {
      87             :     {
      88             :         .name         = "default",
      89             :         .type         = AVMEDIA_TYPE_VIDEO,
      90             :         .filter_frame = filter_frame,
      91             :     },
      92             :     { NULL }
      93             : };
      94             : 
      95             : static const AVFilterPad field_outputs[] = {
      96             :     {
      97             :         .name         = "default",
      98             :         .type         = AVMEDIA_TYPE_VIDEO,
      99             :         .config_props = config_props_output,
     100             :     },
     101             :     { NULL }
     102             : };
     103             : 
     104             : AVFilter ff_vf_field = {
     105             :     .name        = "field",
     106             :     .description = NULL_IF_CONFIG_SMALL("Extract a field from the input video."),
     107             :     .priv_size   = sizeof(FieldContext),
     108             :     .inputs      = field_inputs,
     109             :     .outputs     = field_outputs,
     110             :     .priv_class  = &field_class,
     111             : };

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