2 * Copyright (c) 2011 Mark Himsley
4 * This file is part of Libav.
6 * Libav 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.
11 * Libav 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.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * video field order filter, heavily influenced by vf_pad.c
31 #include "libavutil/imgutils.h"
32 #include "libavutil/internal.h"
33 #include "libavutil/opt.h"
34 #include "libavutil/pixdesc.h"
43 int dst_tff; ///< output bff/tff
44 int line_size[4]; ///< bytes of pixel data per line for each plane
47 static int query_formats(AVFilterContext *ctx)
49 AVFilterFormats *formats;
50 enum AVPixelFormat pix_fmt;
53 /** accept any input pixel format that is not hardware accelerated, not
54 * a bitstream format, and does not have vertically sub-sampled chroma */
57 for (pix_fmt = 0; pix_fmt < AV_PIX_FMT_NB; pix_fmt++) {
58 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
59 if (!(desc->flags & PIX_FMT_HWACCEL ||
60 desc->flags & PIX_FMT_BITSTREAM) &&
61 desc->nb_components && !desc->log2_chroma_h &&
62 (ret = ff_add_format(&formats, pix_fmt)) < 0) {
63 ff_formats_unref(&formats);
67 ff_formats_ref(formats, &ctx->inputs[0]->out_formats);
68 ff_formats_ref(formats, &ctx->outputs[0]->in_formats);
74 static int config_input(AVFilterLink *inlink)
76 AVFilterContext *ctx = inlink->dst;
77 FieldOrderContext *fieldorder = ctx->priv;
80 /** full an array with the number of bytes that the video
81 * data occupies per line for each plane of the input video */
82 for (plane = 0; plane < 4; plane++) {
83 fieldorder->line_size[plane] = av_image_get_linesize(
92 static AVFrame *get_video_buffer(AVFilterLink *inlink, int w, int h)
94 AVFilterContext *ctx = inlink->dst;
95 AVFilterLink *outlink = ctx->outputs[0];
97 return ff_get_video_buffer(outlink, w, h);
100 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
102 AVFilterContext *ctx = inlink->dst;
103 FieldOrderContext *s = ctx->priv;
104 AVFilterLink *outlink = ctx->outputs[0];
105 int h, plane, line_step, line_size, line;
108 if (!frame->interlaced_frame ||
109 frame->top_field_first == s->dst_tff)
110 return ff_filter_frame(outlink, frame);
113 "picture will move %s one line\n",
114 s->dst_tff ? "up" : "down");
116 for (plane = 0; plane < 4 && frame->data[plane]; plane++) {
117 line_step = frame->linesize[plane];
118 line_size = s->line_size[plane];
119 data = frame->data[plane];
121 /** Move every line up one line, working from
122 * the top to the bottom of the frame.
123 * The original top line is lost.
124 * The new last line is created as a copy of the
125 * penultimate line from that field. */
126 for (line = 0; line < h; line++) {
127 if (1 + line < frame->height) {
128 memcpy(data, data + line_step, line_size);
130 memcpy(data, data - line_step - line_step, line_size);
135 /** Move every line down one line, working from
136 * the bottom to the top of the frame.
137 * The original bottom line is lost.
138 * The new first line is created as a copy of the
139 * second line from that field. */
140 data += (h - 1) * line_step;
141 for (line = h - 1; line >= 0 ; line--) {
143 memcpy(data, data - line_step, line_size);
145 memcpy(data, data + line_step + line_step, line_size);
151 frame->top_field_first = s->dst_tff;
153 return ff_filter_frame(outlink, frame);
156 #define OFFSET(x) offsetof(FieldOrderContext, x)
157 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM
158 static const AVOption options[] = {
159 { "order", "output field order", OFFSET(dst_tff), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, FLAGS, "order" },
160 { "bff", "bottom field first", 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, .unit = "order" },
161 { "tff", "top field first", 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, .unit = "order" },
165 static const AVClass fieldorder_class = {
166 .class_name = "fieldorder",
167 .item_name = av_default_item_name,
169 .version = LIBAVUTIL_VERSION_INT,
172 static const AVFilterPad avfilter_vf_fieldorder_inputs[] = {
175 .type = AVMEDIA_TYPE_VIDEO,
176 .config_props = config_input,
177 .get_video_buffer = get_video_buffer,
178 .filter_frame = filter_frame,
184 static const AVFilterPad avfilter_vf_fieldorder_outputs[] = {
187 .type = AVMEDIA_TYPE_VIDEO,
192 AVFilter avfilter_vf_fieldorder = {
193 .name = "fieldorder",
194 .description = NULL_IF_CONFIG_SMALL("Set the field order."),
195 .priv_size = sizeof(FieldOrderContext),
196 .priv_class = &fieldorder_class,
197 .query_formats = query_formats,
198 .inputs = avfilter_vf_fieldorder_inputs,
199 .outputs = avfilter_vf_fieldorder_outputs,