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/opt.h"
30 #include "libavutil/pixdesc.h"
38 int dst_tff; ///< output bff/tff
39 int line_size[4]; ///< bytes of pixel data per line for each plane
42 static int query_formats(AVFilterContext *ctx)
44 AVFilterFormats *formats;
45 enum AVPixelFormat pix_fmt;
48 /** accept any input pixel format that is not hardware accelerated, not
49 * a bitstream format, and does not have vertically sub-sampled chroma */
52 for (pix_fmt = 0; pix_fmt < AV_PIX_FMT_NB; pix_fmt++) {
53 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
54 if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
55 desc->flags & AV_PIX_FMT_FLAG_PAL ||
56 desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) &&
57 desc->nb_components && !desc->log2_chroma_h &&
58 (ret = ff_add_format(&formats, pix_fmt)) < 0) {
59 ff_formats_unref(&formats);
63 ff_formats_ref(formats, &ctx->inputs[0]->out_formats);
64 ff_formats_ref(formats, &ctx->outputs[0]->in_formats);
70 static int config_input(AVFilterLink *inlink)
72 AVFilterContext *ctx = inlink->dst;
73 FieldOrderContext *s = ctx->priv;
75 return av_image_fill_linesizes(s->line_size, inlink->format, inlink->w);
78 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
80 AVFilterContext *ctx = inlink->dst;
81 FieldOrderContext *s = ctx->priv;
82 AVFilterLink *outlink = ctx->outputs[0];
83 int h, plane, src_line_step, dst_line_step, line_size, line;
87 if (!frame->interlaced_frame ||
88 frame->top_field_first == s->dst_tff)
89 return ff_filter_frame(outlink, frame);
91 if (av_frame_is_writable(frame)) {
94 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
96 av_frame_free(&frame);
97 return AVERROR(ENOMEM);
99 av_frame_copy_props(out, frame);
103 "picture will move %s one line\n",
104 s->dst_tff ? "up" : "down");
106 for (plane = 0; plane < 4 && frame->data[plane] && frame->linesize[plane]; plane++) {
107 dst_line_step = out->linesize[plane];
108 src_line_step = frame->linesize[plane];
109 line_size = s->line_size[plane];
110 dst = out->data[plane];
111 src = 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(dst, src + src_line_step, line_size);
122 memcpy(dst, src - 2 * src_line_step, line_size);
124 dst += dst_line_step;
125 src += src_line_step;
128 /** Move every line down one line, working from
129 * the bottom to the top of the frame.
130 * The original bottom line is lost.
131 * The new first line is created as a copy of the
132 * second line from that field. */
133 dst += (h - 1) * dst_line_step;
134 src += (h - 1) * src_line_step;
135 for (line = h - 1; line >= 0 ; line--) {
137 memcpy(dst, src - src_line_step, line_size);
139 memcpy(dst, src + 2 * src_line_step, line_size);
141 dst -= dst_line_step;
142 src -= src_line_step;
146 out->top_field_first = s->dst_tff;
149 av_frame_free(&frame);
150 return ff_filter_frame(outlink, out);
153 #define OFFSET(x) offsetof(FieldOrderContext, x)
154 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
156 static const AVOption fieldorder_options[] = {
157 { "order", "output field order", OFFSET(dst_tff), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, FLAGS, "order" },
158 { "bff", "bottom field first", 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, .flags=FLAGS, .unit = "order" },
159 { "tff", "top field first", 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, .flags=FLAGS, .unit = "order" },
163 AVFILTER_DEFINE_CLASS(fieldorder);
165 static const AVFilterPad avfilter_vf_fieldorder_inputs[] = {
168 .type = AVMEDIA_TYPE_VIDEO,
169 .config_props = config_input,
170 .filter_frame = filter_frame,
175 static const AVFilterPad avfilter_vf_fieldorder_outputs[] = {
178 .type = AVMEDIA_TYPE_VIDEO,
183 AVFilter avfilter_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,
191 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,