yading@10: /*
yading@10:  * Copyright (c) 2012 Stefano Sabatini
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * set field order
yading@10:  */
yading@10: 
yading@10: #include "libavutil/opt.h"
yading@10: #include "avfilter.h"
yading@10: #include "internal.h"
yading@10: #include "video.h"
yading@10: 
yading@10: enum SetFieldMode {
yading@10:     MODE_AUTO = -1,
yading@10:     MODE_BFF,
yading@10:     MODE_TFF,
yading@10:     MODE_PROG,
yading@10: };
yading@10: 
yading@10: typedef struct {
yading@10:     const AVClass *class;
yading@10:     enum SetFieldMode mode;
yading@10: } SetFieldContext;
yading@10: 
yading@10: #define OFFSET(x) offsetof(SetFieldContext, x)
yading@10: #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
yading@10: 
yading@10: static const AVOption setfield_options[] = {
yading@10:     {"mode", "select interlace mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_AUTO}, -1, MODE_PROG, FLAGS, "mode"},
yading@10:     {"auto", "keep the same input field",  0, AV_OPT_TYPE_CONST, {.i64=MODE_AUTO}, INT_MIN, INT_MAX, FLAGS, "mode"},
yading@10:     {"bff",  "mark as bottom-field-first", 0, AV_OPT_TYPE_CONST, {.i64=MODE_BFF},  INT_MIN, INT_MAX, FLAGS, "mode"},
yading@10:     {"tff",  "mark as top-field-first",    0, AV_OPT_TYPE_CONST, {.i64=MODE_TFF},  INT_MIN, INT_MAX, FLAGS, "mode"},
yading@10:     {"prog", "mark as progressive",        0, AV_OPT_TYPE_CONST, {.i64=MODE_PROG}, INT_MIN, INT_MAX, FLAGS, "mode"},
yading@10:     {NULL}
yading@10: };
yading@10: 
yading@10: AVFILTER_DEFINE_CLASS(setfield);
yading@10: 
yading@10: static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
yading@10: {
yading@10:     SetFieldContext *setfield = inlink->dst->priv;
yading@10: 
yading@10:     if (setfield->mode == MODE_PROG) {
yading@10:         picref->interlaced_frame = 0;
yading@10:     } else if (setfield->mode != MODE_AUTO) {
yading@10:         picref->interlaced_frame = 1;
yading@10:         picref->top_field_first = setfield->mode;
yading@10:     }
yading@10:     return ff_filter_frame(inlink->dst->outputs[0], picref);
yading@10: }
yading@10: 
yading@10: static const AVFilterPad setfield_inputs[] = {
yading@10:     {
yading@10:         .name             = "default",
yading@10:         .type             = AVMEDIA_TYPE_VIDEO,
yading@10:         .get_video_buffer = ff_null_get_video_buffer,
yading@10:         .filter_frame     = filter_frame,
yading@10:     },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: static const AVFilterPad setfield_outputs[] = {
yading@10:     {
yading@10:         .name = "default",
yading@10:         .type = AVMEDIA_TYPE_VIDEO,
yading@10:     },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: AVFilter avfilter_vf_setfield = {
yading@10:     .name      = "setfield",
yading@10:     .description = NULL_IF_CONFIG_SMALL("Force field for the output video frame."),
yading@10:     .priv_size = sizeof(SetFieldContext),
yading@10:     .inputs    = setfield_inputs,
yading@10:     .outputs   = setfield_outputs,
yading@10:     .priv_class = &setfield_class,
yading@10: };