2 * Copyright (c) 2011 Mark Himsley
4 * This file is part of FFmpeg.
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.
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.
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
23 * video field order filter, heavily influenced by vf_pad.c
26 #include "libavutil/opt.h"
27 #include "libavutil/imgutils.h"
28 #include "libavutil/internal.h"
29 #include "libavutil/pixdesc.h"
43 enum FieldOrder order;
44 unsigned int dst_tff; ///< output bff/tff
45 int line_size[4]; ///< bytes of pixel data per line for each plane
48 #define OFFSET(x) offsetof(FieldOrderContext, x)
49 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
51 static const AVOption fieldorder_options[] = {
52 { "order", "set output field order", OFFSET(order), AV_OPT_TYPE_INT, {.i64=ORDER_TFF}, 0, ORDER_NB-1, FLAGS, "order" },
53 { "tff", "set top field first", 0, AV_OPT_TYPE_CONST, {.i64=ORDER_TFF}, .flags=FLAGS, .unit="order" },
54 { "bff", "set bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=ORDER_BFF}, .flags=FLAGS, .unit="order" },
58 AVFILTER_DEFINE_CLASS(fieldorder);
60 static av_cold int init(AVFilterContext *ctx, const char *args)
62 FieldOrderContext *fieldorder = ctx->priv;
64 static const char *shorthand[] = { "order", NULL };
66 fieldorder->class = &fieldorder_class;
67 av_opt_set_defaults(fieldorder);
69 if ((ret = av_opt_set_from_string(fieldorder, args, shorthand, "=", ":")) < 0)
72 fieldorder->dst_tff = fieldorder->order == ORDER_TFF;
73 av_log(ctx, AV_LOG_VERBOSE, "tff:%d\n", fieldorder->dst_tff);
78 static int query_formats(AVFilterContext *ctx)
80 AVFilterFormats *formats;
81 enum AVPixelFormat pix_fmt;
84 /** accept any input pixel format that is not hardware accelerated, not
85 * a bitstream format, and does not have vertically sub-sampled chroma */
88 for (pix_fmt = 0; pix_fmt < AV_PIX_FMT_NB; pix_fmt++) {
89 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
90 if (!(desc->flags & PIX_FMT_HWACCEL ||
91 desc->flags & PIX_FMT_BITSTREAM) &&
92 desc->nb_components && !desc->log2_chroma_h &&
93 (ret = ff_add_format(&formats, pix_fmt)) < 0) {
94 ff_formats_unref(&formats);
98 ff_formats_ref(formats, &ctx->inputs[0]->out_formats);
99 ff_formats_ref(formats, &ctx->outputs[0]->in_formats);
105 static int config_input(AVFilterLink *inlink)
107 AVFilterContext *ctx = inlink->dst;
108 FieldOrderContext *fieldorder = ctx->priv;
111 /** full an array with the number of bytes that the video
112 * data occupies per line for each plane of the input video */
113 for (plane = 0; plane < 4; plane++) {
114 fieldorder->line_size[plane] = av_image_get_linesize(
123 static AVFrame *get_video_buffer(AVFilterLink *inlink, int w, int h)
125 AVFilterContext *ctx = inlink->dst;
126 AVFilterLink *outlink = ctx->outputs[0];
128 return ff_get_video_buffer(outlink, w, h);
131 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
133 AVFilterContext *ctx = inlink->dst;
134 FieldOrderContext *s = ctx->priv;
135 AVFilterLink *outlink = ctx->outputs[0];
136 int h, plane, line_step, line_size, line;
139 if (!frame->interlaced_frame ||
140 frame->top_field_first == s->dst_tff)
141 return ff_filter_frame(outlink, frame);
144 "picture will move %s one line\n",
145 s->dst_tff ? "up" : "down");
147 for (plane = 0; plane < 4 && frame->data[plane]; plane++) {
148 line_step = frame->linesize[plane];
149 line_size = s->line_size[plane];
150 data = frame->data[plane];
152 /** Move every line up one line, working from
153 * the top to the bottom of the frame.
154 * The original top line is lost.
155 * The new last line is created as a copy of the
156 * penultimate line from that field. */
157 for (line = 0; line < h; line++) {
158 if (1 + line < frame->height) {
159 memcpy(data, data + line_step, line_size);
161 memcpy(data, data - line_step - line_step, line_size);
166 /** Move every line down one line, working from
167 * the bottom to the top of the frame.
168 * The original bottom line is lost.
169 * The new first line is created as a copy of the
170 * second line from that field. */
171 data += (h - 1) * line_step;
172 for (line = h - 1; line >= 0 ; line--) {
174 memcpy(data, data - line_step, line_size);
176 memcpy(data, data + line_step + line_step, line_size);
182 frame->top_field_first = s->dst_tff;
184 return ff_filter_frame(outlink, frame);
187 static const AVFilterPad avfilter_vf_fieldorder_inputs[] = {
190 .type = AVMEDIA_TYPE_VIDEO,
191 .config_props = config_input,
192 .get_video_buffer = get_video_buffer,
193 .filter_frame = filter_frame,
199 static const AVFilterPad avfilter_vf_fieldorder_outputs[] = {
202 .type = AVMEDIA_TYPE_VIDEO,
207 AVFilter avfilter_vf_fieldorder = {
208 .name = "fieldorder",
209 .description = NULL_IF_CONFIG_SMALL("Set the field order."),
211 .priv_size = sizeof(FieldOrderContext),
212 .query_formats = query_formats,
213 .inputs = avfilter_vf_fieldorder_inputs,
214 .outputs = avfilter_vf_fieldorder_outputs,
215 .priv_class = &fieldorder_class,