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path: root/libavfilter/vf_fieldhint.c (plain)
blob: 3cfeb20a382ca5caec40ad221c8dfd8e757bf979
1/*
2 * Copyright (c) 2016 Paul B Mahol
3 *
4 * This file is part of FFmpeg.
5 *
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.
10 *
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.
15 *
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
19 */
20
21#include "libavutil/avassert.h"
22#include "libavutil/imgutils.h"
23#include "libavutil/internal.h"
24#include "libavutil/opt.h"
25#include "libavutil/pixdesc.h"
26#include "avfilter.h"
27#include "internal.h"
28#include "video.h"
29
30typedef struct FieldHintContext {
31 const AVClass *class;
32
33 char *hint_file_str;
34 FILE *hint;
35 int mode;
36
37 AVFrame *frame[3];
38
39 int64_t line;
40 int nb_planes;
41 int eof;
42 int planewidth[4];
43 int planeheight[4];
44} FieldHintContext;
45
46#define OFFSET(x) offsetof(FieldHintContext, x)
47#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
48
49static const AVOption fieldhint_options[] = {
50 { "hint", "set hint file", OFFSET(hint_file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
51 { "mode", "set hint mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "mode" },
52 { "absolute", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "mode" },
53 { "relative", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "mode" },
54 { NULL }
55};
56
57AVFILTER_DEFINE_CLASS(fieldhint);
58
59static av_cold int init(AVFilterContext *ctx)
60{
61 FieldHintContext *s = ctx->priv;
62 int ret;
63
64 if (!s->hint_file_str) {
65 av_log(ctx, AV_LOG_ERROR, "Hint file must be set.\n");
66 return AVERROR(EINVAL);
67 }
68 s->hint = fopen(s->hint_file_str, "r");
69 if (!s->hint) {
70 ret = AVERROR(errno);
71 av_log(ctx, AV_LOG_ERROR, "%s: %s\n", s->hint_file_str, av_err2str(ret));
72 return ret;
73 }
74
75 return 0;
76}
77
78static int query_formats(AVFilterContext *ctx)
79{
80 AVFilterFormats *pix_fmts = NULL;
81 int fmt, ret;
82
83 for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
84 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
85 if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
86 desc->flags & AV_PIX_FMT_FLAG_PAL ||
87 desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) &&
88 (ret = ff_add_format(&pix_fmts, fmt)) < 0)
89 return ret;
90 }
91
92 return ff_set_common_formats(ctx, pix_fmts);
93}
94
95static int config_input(AVFilterLink *inlink)
96{
97 FieldHintContext *s = inlink->dst->priv;
98 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
99 int ret;
100
101 if ((ret = av_image_fill_linesizes(s->planewidth, inlink->format, inlink->w)) < 0)
102 return ret;
103
104 s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
105 s->planeheight[0] = s->planeheight[3] = inlink->h;
106
107 s->nb_planes = av_pix_fmt_count_planes(inlink->format);
108
109 return 0;
110}
111
112static int filter_frame(AVFilterLink *inlink, AVFrame *in)
113{
114 AVFilterContext *ctx = inlink->dst;
115 AVFilterLink *outlink = ctx->outputs[0];
116 FieldHintContext *s = ctx->priv;
117 AVFrame *out, *top, *bottom;
118 char buf[1024] = { 0 };
119 int64_t tf, bf;
120 char hint = '=';
121 int p;
122
123 av_frame_free(&s->frame[0]);
124 s->frame[0] = s->frame[1];
125 s->frame[1] = s->frame[2];
126 s->frame[2] = in;
127 if (!s->frame[1])
128 return 0;
129 else if (!s->frame[0]) {
130 s->frame[0] = av_frame_clone(s->frame[1]);
131 if (!s->frame[0])
132 return AVERROR(ENOMEM);
133 }
134
135 while (1) {
136 if (fgets(buf, sizeof(buf)-1, s->hint)) {
137 s->line++;
138 if (buf[0] == '#' || buf[0] == ';') {
139 continue;
140 } else if (sscanf(buf, "%"PRId64",%"PRId64" %c", &tf, &bf, &hint) == 3) {
141 ;
142 } else if (sscanf(buf, "%"PRId64",%"PRId64"", &tf, &bf) == 2) {
143 ;
144 } else {
145 av_log(ctx, AV_LOG_ERROR, "Invalid entry at line %"PRId64".\n", s->line);
146 return AVERROR_INVALIDDATA;
147 }
148 switch (s->mode) {
149 case 0:
150 if (tf > outlink->frame_count_in + 1 || tf < FFMAX(0, outlink->frame_count_in - 1) ||
151 bf > outlink->frame_count_in + 1 || bf < FFMAX(0, outlink->frame_count_in - 1)) {
152 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_out);
153 return AVERROR_INVALIDDATA;
154 }
155 break;
156 case 1:
157 if (tf > 1 || tf < -1 ||
158 bf > 1 || bf < -1) {
159 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_out);
160 return AVERROR_INVALIDDATA;
161 }
162 };
163 break;
164 } else {
165 av_log(ctx, AV_LOG_ERROR, "Missing entry for %"PRId64". input frame.\n", inlink->frame_count_out);
166 return AVERROR_INVALIDDATA;
167 }
168 }
169
170 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
171 if (!out)
172 return AVERROR(ENOMEM);
173 av_frame_copy_props(out, s->frame[1]);
174
175 switch (s->mode) {
176 case 0:
177 top = s->frame[tf - outlink->frame_count_in + 1];
178 bottom = s->frame[bf - outlink->frame_count_in + 1];
179 break;
180 case 1:
181 top = s->frame[1 + tf];
182 bottom = s->frame[1 + bf];
183 break;
184 default:
185 av_assert0(0);
186 }
187
188 switch (hint) {
189 case '+':
190 out->interlaced_frame = 1;
191 break;
192 case '-':
193 out->interlaced_frame = 0;
194 break;
195 case '=':
196 break;
197 default:
198 av_log(ctx, AV_LOG_ERROR, "Invalid hint: %c.\n", hint);
199 av_frame_free(&out);
200 return AVERROR(EINVAL);
201 }
202
203 for (p = 0; p < s->nb_planes; p++) {
204 av_image_copy_plane(out->data[p],
205 out->linesize[p] * 2,
206 top->data[p],
207 top->linesize[p] * 2,
208 s->planewidth[p],
209 (s->planeheight[p] + 1) / 2);
210 av_image_copy_plane(out->data[p] + out->linesize[p],
211 out->linesize[p] * 2,
212 bottom->data[p] + bottom->linesize[p],
213 bottom->linesize[p] * 2,
214 s->planewidth[p],
215 (s->planeheight[p] + 1) / 2);
216 }
217
218 return ff_filter_frame(outlink, out);
219}
220
221static int request_frame(AVFilterLink *outlink)
222{
223 AVFilterContext *ctx = outlink->src;
224 FieldHintContext *s = ctx->priv;
225 int ret;
226
227 if (s->eof)
228 return AVERROR_EOF;
229
230 ret = ff_request_frame(ctx->inputs[0]);
231 if (ret == AVERROR_EOF && s->frame[2]) {
232 AVFrame *next = av_frame_clone(s->frame[2]);
233 if (!next)
234 return AVERROR(ENOMEM);
235 ret = filter_frame(ctx->inputs[0], next);
236 s->eof = 1;
237 }
238
239 return ret;
240}
241
242static av_cold void uninit(AVFilterContext *ctx)
243{
244 FieldHintContext *s = ctx->priv;
245
246 if (s->hint)
247 fclose(s->hint);
248 s->hint = NULL;
249
250 av_frame_free(&s->frame[0]);
251 av_frame_free(&s->frame[1]);
252 av_frame_free(&s->frame[2]);
253}
254
255static const AVFilterPad inputs[] = {
256 {
257 .name = "default",
258 .type = AVMEDIA_TYPE_VIDEO,
259 .config_props = config_input,
260 .filter_frame = filter_frame,
261 },
262 { NULL }
263};
264
265static const AVFilterPad outputs[] = {
266 {
267 .name = "default",
268 .type = AVMEDIA_TYPE_VIDEO,
269 .request_frame = request_frame,
270 },
271 { NULL }
272};
273
274AVFilter ff_vf_fieldhint = {
275 .name = "fieldhint",
276 .description = NULL_IF_CONFIG_SMALL("Field matching using hints."),
277 .priv_size = sizeof(FieldHintContext),
278 .priv_class = &fieldhint_class,
279 .init = init,
280 .uninit = uninit,
281 .query_formats = query_formats,
282 .inputs = inputs,
283 .outputs = outputs,
284};
285
generated by cgit at 2024-05-17 03:41:03 (GMT)