1 /*
2 * Copyright (c) 2004 Ville Saari
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 General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 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
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * 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/pixdesc.h"
24 #include "libavutil/opt.h"
25 #include "avfilter.h"
26 #include "formats.h"
27 #include "internal.h"
28 #include "video.h"
29
30 enum PhaseMode {
31 PROGRESSIVE,
32 TOP_FIRST,
33 BOTTOM_FIRST,
34 TOP_FIRST_ANALYZE,
35 BOTTOM_FIRST_ANALYZE,
36 ANALYZE,
37 FULL_ANALYZE,
38 AUTO,
39 AUTO_ANALYZE
40 };
41
42 typedef struct PhaseContext {
43 const AVClass *class;
44 enum PhaseMode mode;
45 AVFrame *frame; /* previous frame */
46 int nb_planes;
47 int planeheight[4];
48 int linesize[4];
49 } PhaseContext;
50
51 #define OFFSET(x) offsetof(PhaseContext, x)
52 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
53
54 #define CONST(name, help, val, unit) { name, help, 0, AV_OPT_TYPE_CONST, {.i64=val}, 0, 0, FLAGS, unit }
55
56 static const AVOption phase_options[] = {
57 { "mode", "set phase mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=AUTO_ANALYZE}, PROGRESSIVE, AUTO_ANALYZE, FLAGS, "mode" },
58 CONST("p", "progressive", PROGRESSIVE, "mode"),
59 CONST("t", "top first", TOP_FIRST, "mode"),
60 CONST("b", "bottom first", BOTTOM_FIRST, "mode"),
61 CONST("T", "top first analyze", TOP_FIRST_ANALYZE, "mode"),
62 CONST("B", "bottom first analyze", BOTTOM_FIRST_ANALYZE, "mode"),
63 CONST("u", "analyze", ANALYZE, "mode"),
64 CONST("U", "full analyze", FULL_ANALYZE, "mode"),
65 CONST("a", "auto", AUTO, "mode"),
66 CONST("A", "auto analyze", AUTO_ANALYZE, "mode"),
67 { NULL }
68 };
69
70 AVFILTER_DEFINE_CLASS(phase);
71
query_formats(AVFilterContext * ctx)72 static int query_formats(AVFilterContext *ctx)
73 {
74 static const enum AVPixelFormat pix_fmts[] = {
75 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
76 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ422P,AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,
77 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
78 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE
79 };
80
81 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
82 return 0;
83 }
84
config_input(AVFilterLink * inlink)85 static int config_input(AVFilterLink *inlink)
86 {
87 PhaseContext *s = inlink->dst->priv;
88 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
89 int ret;
90
91 if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
92 return ret;
93
94 s->planeheight[1] = s->planeheight[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
95 s->planeheight[0] = s->planeheight[3] = inlink->h;
96
97 s->nb_planes = av_pix_fmt_count_planes(inlink->format);
98
99 return 0;
100 }
101
102 /*
103 * This macro interpolates the value of both fields at a point halfway
104 * between lines and takes the squared difference. In field resolution
105 * the point is a quarter pixel below a line in one field and a quarter
106 * pixel above a line in other.
107 *
108 * (The result is actually multiplied by 25)
109 */
110 #define DIFF(a, as, b, bs) (t = ((*a - b[bs]) << 2) + a[as << 1] - b[-bs], t * t)
111
112 /*
113 * Find which field combination has the smallest average squared difference
114 * between the fields.
115 */
analyze_plane(void * ctx,enum PhaseMode mode,AVFrame * old,AVFrame * new)116 static enum PhaseMode analyze_plane(void *ctx, enum PhaseMode mode, AVFrame *old, AVFrame *new)
117 {
118 double bdiff, tdiff, pdiff, scale;
119 const int ns = new->linesize[0];
120 const int os = old->linesize[0];
121 const uint8_t *nptr = new->data[0];
122 const uint8_t *optr = old->data[0];
123 const int h = new->height;
124 const int w = new->width;
125 int bdif, tdif, pdif;
126
127 if (mode == AUTO) {
128 mode = new->interlaced_frame ? new->top_field_first ?
129 TOP_FIRST : BOTTOM_FIRST : PROGRESSIVE;
130 } else if (mode == AUTO_ANALYZE) {
131 mode = new->interlaced_frame ? new->top_field_first ?
132 TOP_FIRST_ANALYZE : BOTTOM_FIRST_ANALYZE : FULL_ANALYZE;
133 }
134
135 if (mode <= BOTTOM_FIRST) {
136 bdiff = pdiff = tdiff = 65536.0;
137 } else {
138 int top = 0, t;
139 const uint8_t *rend, *end = nptr + (h - 2) * ns;
140
141 bdiff = pdiff = tdiff = 0.0;
142
143 nptr += ns;
144 optr += os;
145 while (nptr < end) {
146 pdif = tdif = bdif = 0;
147
148 switch (mode) {
149 case TOP_FIRST_ANALYZE:
150 if (top) {
151 for (rend = nptr + w; nptr < rend; nptr++, optr++) {
152 pdif += DIFF(nptr, ns, nptr, ns);
153 tdif += DIFF(nptr, ns, optr, os);
154 }
155 } else {
156 for (rend = nptr + w; nptr < rend; nptr++, optr++) {
157 pdif += DIFF(nptr, ns, nptr, ns);
158 tdif += DIFF(optr, os, nptr, ns);
159 }
160 }
161 break;
162 case BOTTOM_FIRST_ANALYZE:
163 if (top) {
164 for (rend = nptr + w; nptr < rend; nptr++, optr++) {
165 pdif += DIFF(nptr, ns, nptr, ns);
166 bdif += DIFF(optr, os, nptr, ns);
167 }
168 } else {
169 for (rend = nptr + w; nptr < rend; nptr++, optr++) {
170 pdif += DIFF(nptr, ns, nptr, ns);
171 bdif += DIFF(nptr, ns, optr, os);
172 }
173 }
174 break;
175 case ANALYZE:
176 if (top) {
177 for (rend = nptr + w; nptr < rend; nptr++, optr++) {
178 tdif += DIFF(nptr, ns, optr, os);
179 bdif += DIFF(optr, os, nptr, ns);
180 }
181 } else {
182 for (rend = nptr + w; nptr < rend; nptr++, optr++) {
183 bdif += DIFF(nptr, ns, optr, os);
184 tdif += DIFF(optr, os, nptr, ns);
185 }
186 }
187 break;
188 case FULL_ANALYZE:
189 if (top) {
190 for (rend = nptr + w; nptr < rend; nptr++, optr++) {
191 pdif += DIFF(nptr, ns, nptr, ns);
192 tdif += DIFF(nptr, ns, optr, os);
193 bdif += DIFF(optr, os, nptr, ns);
194 }
195 } else {
196 for (rend = nptr + w; nptr < rend; nptr++, optr++) {
197 pdif += DIFF(nptr, ns, nptr, ns);
198 bdif += DIFF(nptr, ns, optr, os);
199 tdif += DIFF(optr, os, nptr, ns);
200 }
201 }
202 break;
203 default:
204 av_assert0(0);
205 }
206
207 pdiff += (double)pdif;
208 tdiff += (double)tdif;
209 bdiff += (double)bdif;
210 nptr += ns - w;
211 optr += os - w;
212 top ^= 1;
213 }
214
215 scale = 1.0 / (w * (h - 3)) / 25.0;
216 pdiff *= scale;
217 tdiff *= scale;
218 bdiff *= scale;
219
220 if (mode == TOP_FIRST_ANALYZE) {
221 bdiff = 65536.0;
222 } else if (mode == BOTTOM_FIRST_ANALYZE) {
223 tdiff = 65536.0;
224 } else if (mode == ANALYZE) {
225 pdiff = 65536.0;
226 }
227
228 if (bdiff < pdiff && bdiff < tdiff) {
229 mode = BOTTOM_FIRST;
230 } else if (tdiff < pdiff && tdiff < bdiff) {
231 mode = TOP_FIRST;
232 } else {
233 mode = PROGRESSIVE;
234 }
235 }
236
237 av_log(ctx, AV_LOG_DEBUG, "mode=%c tdiff=%f bdiff=%f pdiff=%f\n",
238 mode == BOTTOM_FIRST ? 'b' : mode == TOP_FIRST ? 't' : 'p',
239 tdiff, bdiff, pdiff);
240 return mode;
241 }
242
filter_frame(AVFilterLink * inlink,AVFrame * in)243 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
244 {
245 AVFilterContext *ctx = inlink->dst;
246 AVFilterLink *outlink = ctx->outputs[0];
247 PhaseContext *s = ctx->priv;
248 enum PhaseMode mode;
249 int plane, top, y;
250 AVFrame *out;
251
252 if (ctx->is_disabled) {
253 av_frame_free(&s->frame);
254 /* we keep a reference to the previous frame so the filter can start
255 * being useful as soon as it's not disabled, avoiding the 1-frame
256 * delay. */
257 s->frame = av_frame_clone(in);
258 return ff_filter_frame(outlink, in);
259 }
260
261 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
262 if (!out) {
263 av_frame_free(&in);
264 return AVERROR(ENOMEM);
265 }
266 av_frame_copy_props(out, in);
267
268 if (!s->frame) {
269 s->frame = in;
270 mode = PROGRESSIVE;
271 } else {
272 mode = analyze_plane(ctx, s->mode, s->frame, in);
273 }
274
275 for (plane = 0; plane < s->nb_planes; plane++) {
276 const uint8_t *buf = s->frame->data[plane];
277 const uint8_t *from = in->data[plane];
278 uint8_t *to = out->data[plane];
279
280 for (y = 0, top = 1; y < s->planeheight[plane]; y++, top ^= 1) {
281 memcpy(to, mode == (top ? BOTTOM_FIRST : TOP_FIRST) ? buf : from, s->linesize[plane]);
282
283 buf += s->frame->linesize[plane];
284 from += in->linesize[plane];
285 to += out->linesize[plane];
286 }
287 }
288
289 if (in != s->frame)
290 av_frame_free(&s->frame);
291 s->frame = in;
292 return ff_filter_frame(outlink, out);
293 }
294
uninit(AVFilterContext * ctx)295 static av_cold void uninit(AVFilterContext *ctx)
296 {
297 PhaseContext *s = ctx->priv;
298
299 av_frame_free(&s->frame);
300 }
301
302 static const AVFilterPad phase_inputs[] = {
303 {
304 .name = "default",
305 .type = AVMEDIA_TYPE_VIDEO,
306 .filter_frame = filter_frame,
307 .config_props = config_input,
308 },
309 { NULL }
310 };
311
312 static const AVFilterPad phase_outputs[] = {
313 {
314 .name = "default",
315 .type = AVMEDIA_TYPE_VIDEO,
316 },
317 { NULL }
318 };
319
320 AVFilter ff_vf_phase = {
321 .name = "phase",
322 .description = NULL_IF_CONFIG_SMALL("Phase shift fields."),
323 .priv_size = sizeof(PhaseContext),
324 .priv_class = &phase_class,
325 .uninit = uninit,
326 .query_formats = query_formats,
327 .inputs = phase_inputs,
328 .outputs = phase_outputs,
329 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
330 };
331