2 * Copyright (c) 2016 Paul B Mahol
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
21 #include "libavutil/imgutils.h"
22 #include "libavutil/internal.h"
23 #include "libavutil/opt.h"
24 #include "libavutil/pixdesc.h"
29 typedef struct FieldHintContext {
45 #define OFFSET(x) offsetof(FieldHintContext, x)
46 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
48 static const AVOption fieldhint_options[] = {
49 { "hint", "set hint file", OFFSET(hint_file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
50 { "mode", "set hint mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "mode" },
51 { "absolute", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "mode" },
52 { "relative", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "mode" },
56 AVFILTER_DEFINE_CLASS(fieldhint);
58 static av_cold int init(AVFilterContext *ctx)
60 FieldHintContext *s = ctx->priv;
63 if (!s->hint_file_str) {
64 av_log(ctx, AV_LOG_ERROR, "Hint file must be set.\n");
65 return AVERROR(EINVAL);
67 s->hint = fopen(s->hint_file_str, "r");
70 av_log(ctx, AV_LOG_ERROR, "%s: %s\n", s->hint_file_str, av_err2str(ret));
77 static int query_formats(AVFilterContext *ctx)
79 AVFilterFormats *pix_fmts = NULL;
82 for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
83 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
84 if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
85 desc->flags & AV_PIX_FMT_FLAG_PAL ||
86 desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) &&
87 (ret = ff_add_format(&pix_fmts, fmt)) < 0)
91 return ff_set_common_formats(ctx, pix_fmts);
94 static int config_input(AVFilterLink *inlink)
96 FieldHintContext *s = inlink->dst->priv;
97 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
100 if ((ret = av_image_fill_linesizes(s->planewidth, inlink->format, inlink->w)) < 0)
103 s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
104 s->planeheight[0] = s->planeheight[3] = inlink->h;
106 s->nb_planes = av_pix_fmt_count_planes(inlink->format);
111 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
113 AVFilterContext *ctx = inlink->dst;
114 AVFilterLink *outlink = ctx->outputs[0];
115 FieldHintContext *s = ctx->priv;
116 AVFrame *out, *top, *bottom;
117 char buf[1024] = { 0 };
122 av_frame_free(&s->frame[0]);
123 s->frame[0] = s->frame[1];
124 s->frame[1] = s->frame[2];
128 else if (!s->frame[0]) {
129 s->frame[0] = av_frame_clone(s->frame[1]);
131 return AVERROR(ENOMEM);
135 if (fgets(buf, sizeof(buf)-1, s->hint)) {
137 if (buf[0] == '#' || buf[0] == ';') {
139 } else if (sscanf(buf, "%"PRId64",%"PRId64" %c", &tf, &bf, &hint) == 3) {
141 } else if (sscanf(buf, "%"PRId64",%"PRId64"", &tf, &bf) == 2) {
144 av_log(ctx, AV_LOG_ERROR, "Invalid entry at line %"PRId64".\n", s->line);
145 return AVERROR_INVALIDDATA;
149 if (tf > outlink->frame_count + 1 || tf < FFMAX(0, outlink->frame_count - 1) ||
150 bf > outlink->frame_count + 1 || bf < FFMAX(0, outlink->frame_count - 1)) {
151 av_log(ctx, AV_LOG_ERROR, "Out of range frames %"PRId64" and/or %"PRId64" on line %"PRId64" for %"PRId64". input frame.\n", tf, bf, s->line, inlink->frame_count);
152 return AVERROR_INVALIDDATA;
156 if (tf > 1 || tf < -1 ||
158 av_log(ctx, AV_LOG_ERROR, "Out of range %"PRId64" and/or %"PRId64" on line %"PRId64" for %"PRId64". input frame.\n", tf, bf, s->line, inlink->frame_count);
159 return AVERROR_INVALIDDATA;
164 av_log(ctx, AV_LOG_ERROR, "Missing entry for %"PRId64". input frame.\n", inlink->frame_count);
165 return AVERROR_INVALIDDATA;
169 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
171 return AVERROR(ENOMEM);
172 av_frame_copy_props(out, s->frame[1]);
176 top = s->frame[1 + tf - outlink->frame_count];
177 bottom = s->frame[1 + bf - outlink->frame_count];
180 top = s->frame[1 + tf];
181 bottom = s->frame[1 + bf];
187 out->interlaced_frame = 1;
190 out->interlaced_frame = 0;
195 av_log(ctx, AV_LOG_ERROR, "Invalid hint: %c.\n", hint);
196 return AVERROR(EINVAL);
199 for (p = 0; p < s->nb_planes; p++) {
200 av_image_copy_plane(out->data[p],
201 out->linesize[p] * 2,
203 top->linesize[p] * 2,
205 (s->planeheight[p] + 1) / 2);
206 av_image_copy_plane(out->data[p] + out->linesize[p],
207 out->linesize[p] * 2,
208 bottom->data[p] + bottom->linesize[p],
209 bottom->linesize[p] * 2,
211 (s->planeheight[p] + 1) / 2);
214 return ff_filter_frame(outlink, out);
217 static int request_frame(AVFilterLink *outlink)
219 AVFilterContext *ctx = outlink->src;
220 FieldHintContext *s = ctx->priv;
226 ret = ff_request_frame(ctx->inputs[0]);
227 if (ret == AVERROR_EOF && s->frame[2]) {
228 AVFrame *next = av_frame_clone(s->frame[2]);
230 return AVERROR(ENOMEM);
231 ret = filter_frame(ctx->inputs[0], next);
238 static av_cold void uninit(AVFilterContext *ctx)
240 FieldHintContext *s = ctx->priv;
246 av_frame_free(&s->frame[0]);
247 av_frame_free(&s->frame[1]);
248 av_frame_free(&s->frame[2]);
251 static const AVFilterPad inputs[] = {
254 .type = AVMEDIA_TYPE_VIDEO,
255 .config_props = config_input,
256 .filter_frame = filter_frame,
261 static const AVFilterPad outputs[] = {
264 .type = AVMEDIA_TYPE_VIDEO,
265 .request_frame = request_frame,
270 AVFilter ff_vf_fieldhint = {
272 .description = NULL_IF_CONFIG_SMALL("Field matching using hints."),
273 .priv_size = sizeof(FieldHintContext),
274 .priv_class = &fieldhint_class,
277 .query_formats = query_formats,