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
29 #include "libavutil/imgutils.h"
30 #include "libavutil/internal.h"
31 #include "libavutil/opt.h"
32 #include "libavutil/pixdesc.h"
40 int dst_tff; ///< output bff/tff
41 int line_size[4]; ///< bytes of pixel data per line for each plane
44 static int query_formats(AVFilterContext *ctx)
46 AVFilterFormats *formats;
47 enum AVPixelFormat pix_fmt;
50 /** accept any input pixel format that is not hardware accelerated, not
51 * a bitstream format, and does not have vertically sub-sampled chroma */
54 for (pix_fmt = 0; pix_fmt < AV_PIX_FMT_NB; pix_fmt++) {
55 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
56 if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
57 desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) &&
58 desc->nb_components && !desc->log2_chroma_h &&
59 (ret = ff_add_format(&formats, pix_fmt)) < 0) {
60 ff_formats_unref(&formats);
64 ff_formats_ref(formats, &ctx->inputs[0]->out_formats);
65 ff_formats_ref(formats, &ctx->outputs[0]->in_formats);
71 static int config_input(AVFilterLink *inlink)
73 AVFilterContext *ctx = inlink->dst;
74 FieldOrderContext *s = ctx->priv;
77 /** full an array with the number of bytes that the video
78 * data occupies per line for each plane of the input video */
79 for (plane = 0; plane < 4; plane++) {
80 s->line_size[plane] = av_image_get_linesize(inlink->format, inlink->w,
87 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
89 AVFilterContext *ctx = inlink->dst;
90 FieldOrderContext *s = ctx->priv;
91 AVFilterLink *outlink = ctx->outputs[0];
92 int h, plane, line_step, line_size, line;
95 if (!frame->interlaced_frame ||
96 frame->top_field_first == s->dst_tff) {
97 av_log(ctx, AV_LOG_VERBOSE,
99 frame->interlaced_frame ?
100 "frame with same field order" : "progressive frame");
101 return ff_filter_frame(outlink, frame);
105 "picture will move %s one line\n",
106 s->dst_tff ? "up" : "down");
108 for (plane = 0; plane < 4 && frame->data[plane]; plane++) {
109 line_step = frame->linesize[plane];
110 line_size = s->line_size[plane];
111 data = frame->data[plane];
113 /** Move every line up one line, working from
114 * the top to the bottom of the frame.
115 * The original top line is lost.
116 * The new last line is created as a copy of the
117 * penultimate line from that field. */
118 for (line = 0; line < h; line++) {
119 if (1 + line < frame->height) {
120 memcpy(data, data + line_step, line_size);
122 memcpy(data, data - line_step - line_step, line_size);
127 /** Move every line down one line, working from
128 * the bottom to the top of the frame.
129 * The original bottom line is lost.
130 * The new first line is created as a copy of the
131 * second line from that field. */
132 data += (h - 1) * line_step;
133 for (line = h - 1; line >= 0 ; line--) {
135 memcpy(data, data - line_step, line_size);
137 memcpy(data, data + line_step + line_step, line_size);
143 frame->top_field_first = s->dst_tff;
145 return ff_filter_frame(outlink, frame);
148 #define OFFSET(x) offsetof(FieldOrderContext, x)
149 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM
150 static const AVOption options[] = {
151 { "order", "output field order", OFFSET(dst_tff), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, FLAGS, "order" },
152 { "bff", "bottom field first", 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, .unit = "order" },
153 { "tff", "top field first", 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, .unit = "order" },
157 static const AVClass fieldorder_class = {
158 .class_name = "fieldorder",
159 .item_name = av_default_item_name,
161 .version = LIBAVUTIL_VERSION_INT,
164 static const AVFilterPad avfilter_vf_fieldorder_inputs[] = {
167 .type = AVMEDIA_TYPE_VIDEO,
168 .config_props = config_input,
169 .filter_frame = filter_frame,
175 static const AVFilterPad avfilter_vf_fieldorder_outputs[] = {
178 .type = AVMEDIA_TYPE_VIDEO,
183 AVFilter ff_vf_fieldorder = {
184 .name = "fieldorder",
185 .description = NULL_IF_CONFIG_SMALL("Set the field order."),
186 .priv_size = sizeof(FieldOrderContext),
187 .priv_class = &fieldorder_class,
188 .query_formats = query_formats,
189 .inputs = avfilter_vf_fieldorder_inputs,
190 .outputs = avfilter_vf_fieldorder_outputs,