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  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
  23.  * set field order
  24.  */
  25.  
  26. #include "libavutil/opt.h"
  27. #include "avfilter.h"
  28. #include "internal.h"
  29. #include "video.h"
  30.  
  31. enum SetFieldMode {
  32.     MODE_AUTO = -1,
  33.     MODE_BFF,
  34.     MODE_TFF,
  35.     MODE_PROG,
  36. };
  37.  
  38. typedef struct {
  39.     const AVClass *class;
  40.     enum SetFieldMode mode;
  41. } SetFieldContext;
  42.  
  43. #define OFFSET(x) offsetof(SetFieldContext, x)
  44. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
  45.  
  46. static const AVOption setfield_options[] = {
  47.     {"mode", "select interlace mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_AUTO}, -1, MODE_PROG, FLAGS, "mode"},
  48.     {"auto", "keep the same input field",  0, AV_OPT_TYPE_CONST, {.i64=MODE_AUTO}, INT_MIN, INT_MAX, FLAGS, "mode"},
  49.     {"bff",  "mark as bottom-field-first", 0, AV_OPT_TYPE_CONST, {.i64=MODE_BFF},  INT_MIN, INT_MAX, FLAGS, "mode"},
  50.     {"tff",  "mark as top-field-first",    0, AV_OPT_TYPE_CONST, {.i64=MODE_TFF},  INT_MIN, INT_MAX, FLAGS, "mode"},
  51.     {"prog", "mark as progressive",        0, AV_OPT_TYPE_CONST, {.i64=MODE_PROG}, INT_MIN, INT_MAX, FLAGS, "mode"},
  52.     {NULL}
  53. };
  54.  
  55. AVFILTER_DEFINE_CLASS(setfield);
  56.  
  57. static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
  58. {
  59.     SetFieldContext *setfield = inlink->dst->priv;
  60.  
  61.     if (setfield->mode == MODE_PROG) {
  62.         picref->interlaced_frame = 0;
  63.     } else if (setfield->mode != MODE_AUTO) {
  64.         picref->interlaced_frame = 1;
  65.         picref->top_field_first = setfield->mode;
  66.     }
  67.     return ff_filter_frame(inlink->dst->outputs[0], picref);
  68. }
  69.  
  70. static const AVFilterPad setfield_inputs[] = {
  71.     {
  72.         .name         = "default",
  73.         .type         = AVMEDIA_TYPE_VIDEO,
  74.         .filter_frame = filter_frame,
  75.     },
  76.     { NULL }
  77. };
  78.  
  79. static const AVFilterPad setfield_outputs[] = {
  80.     {
  81.         .name = "default",
  82.         .type = AVMEDIA_TYPE_VIDEO,
  83.     },
  84.     { NULL }
  85. };
  86.  
  87. AVFilter avfilter_vf_setfield = {
  88.     .name        = "setfield",
  89.     .description = NULL_IF_CONFIG_SMALL("Force field for the output video frame."),
  90.     .priv_size   = sizeof(SetFieldContext),
  91.     .priv_class  = &setfield_class,
  92.     .inputs      = setfield_inputs,
  93.     .outputs     = setfield_outputs,
  94. };
  95.