2 * Copyright (C) 2012 British Broadcasting Corporation, All Rights Reserved
3 * Author of de-interlace algorithm: Jim Easterbrook for BBC R&D
4 * Based on the process described by Martin Weston for BBC R&D
5 * Author of FFmpeg filter: Mark Himsley for BBC Broadcast Systems Development
7 * This file is part of FFmpeg.
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "libavutil/common.h"
25 #include "libavutil/imgutils.h"
26 #include "libavutil/opt.h"
27 #include "libavutil/pixdesc.h"
33 typedef struct W3FDIFContext {
35 int filter; ///< 0 is simple, 1 is more complex
36 int deint; ///< which frames to deinterlace
37 int linesize[4]; ///< bytes of pixel data per line for each plane
38 int planeheight[4]; ///< height of each plane
39 int field; ///< which field are we on, 0 or 1
42 AVFrame *prev, *cur, *next; ///< previous, current, next frames
43 int32_t **work_line; ///< lines we are calculating
47 #define OFFSET(x) offsetof(W3FDIFContext, x)
48 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
49 #define CONST(name, help, val, unit) { name, help, 0, AV_OPT_TYPE_CONST, {.i64=val}, 0, 0, FLAGS, unit }
51 static const AVOption w3fdif_options[] = {
52 { "filter", "specify the filter", OFFSET(filter), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS, "filter" },
53 CONST("simple", NULL, 0, "filter"),
54 CONST("complex", NULL, 1, "filter"),
55 { "deint", "specify which frames to deinterlace", OFFSET(deint), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "deint" },
56 CONST("all", "deinterlace all frames", 0, "deint"),
57 CONST("interlaced", "only deinterlace frames marked as interlaced", 1, "deint"),
61 AVFILTER_DEFINE_CLASS(w3fdif);
63 static int query_formats(AVFilterContext *ctx)
65 static const enum AVPixelFormat pix_fmts[] = {
66 AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
67 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
68 AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
69 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
70 AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
72 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
73 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
78 AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
80 return AVERROR(ENOMEM);
81 return ff_set_common_formats(ctx, fmts_list);
84 static int config_input(AVFilterLink *inlink)
86 AVFilterContext *ctx = inlink->dst;
87 W3FDIFContext *s = ctx->priv;
88 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
91 if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
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;
97 s->nb_planes = av_pix_fmt_count_planes(inlink->format);
98 s->nb_threads = ctx->graph->nb_threads;
99 s->work_line = av_calloc(s->nb_threads, sizeof(*s->work_line));
101 return AVERROR(ENOMEM);
103 for (i = 0; i < s->nb_threads; i++) {
104 s->work_line[i] = av_calloc(s->linesize[0], sizeof(*s->work_line[0]));
105 if (!s->work_line[i])
106 return AVERROR(ENOMEM);
112 static int config_output(AVFilterLink *outlink)
114 AVFilterLink *inlink = outlink->src->inputs[0];
116 outlink->time_base.num = inlink->time_base.num;
117 outlink->time_base.den = inlink->time_base.den * 2;
118 outlink->frame_rate.num = inlink->frame_rate.num * 2;
119 outlink->frame_rate.den = inlink->frame_rate.den;
125 * Filter coefficients from PH-2071, scaled by 256 * 256.
126 * Each set of coefficients has a set for low-frequencies and high-frequencies.
127 * n_coef_lf[] and n_coef_hf[] are the number of coefs for simple and more-complex.
128 * It is important for later that n_coef_lf[] is even and n_coef_hf[] is odd.
129 * coef_lf[][] and coef_hf[][] are the coefficients for low-frequencies
130 * and high-frequencies for simple and more-complex mode.
132 static const int8_t n_coef_lf[2] = { 2, 4 };
133 static const int32_t coef_lf[2][4] = {{ 32768, 32768, 0, 0},
134 { -1704, 34472, 34472, -1704}};
135 static const int8_t n_coef_hf[2] = { 3, 5 };
136 static const int32_t coef_hf[2][5] = {{ -4096, 8192, -4096, 0, 0},
137 { 2032, -7602, 11140, -7602, 2032}};
139 typedef struct ThreadData {
140 AVFrame *out, *cur, *adj;
144 static int deinterlace_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
146 W3FDIFContext *s = ctx->priv;
147 ThreadData *td = arg;
148 AVFrame *out = td->out;
149 AVFrame *cur = td->cur;
150 AVFrame *adj = td->adj;
151 const int plane = td->plane;
152 const int filter = s->filter;
153 uint8_t *in_line, *in_lines_cur[5], *in_lines_adj[5];
154 uint8_t *out_line, *out_pixel;
155 int32_t *work_line, *work_pixel;
156 uint8_t *cur_data = cur->data[plane];
157 uint8_t *adj_data = adj->data[plane];
158 uint8_t *dst_data = out->data[plane];
159 const int linesize = s->linesize[plane];
160 const int height = s->planeheight[plane];
161 const int cur_line_stride = cur->linesize[plane];
162 const int adj_line_stride = adj->linesize[plane];
163 const int dst_line_stride = out->linesize[plane];
164 const int start = (height * jobnr) / nb_jobs;
165 const int end = (height * (jobnr+1)) / nb_jobs;
166 int i, j, y_in, y_out;
168 /* copy unchanged the lines of the field */
169 y_out = start + (s->field == cur->top_field_first) - (start & 1);
171 in_line = cur_data + (y_out * cur_line_stride);
172 out_line = dst_data + (y_out * dst_line_stride);
174 while (y_out < end) {
175 memcpy(out_line, in_line, linesize);
177 in_line += cur_line_stride * 2;
178 out_line += dst_line_stride * 2;
181 /* interpolate other lines of the field */
182 y_out = start + (s->field != cur->top_field_first) - (start & 1);
184 out_line = dst_data + (y_out * dst_line_stride);
186 while (y_out < end) {
187 /* clear workspace */
188 memset(s->work_line[jobnr], 0, sizeof(*s->work_line[jobnr]) * linesize);
190 /* get low vertical frequencies from current field */
191 for (j = 0; j < n_coef_lf[filter]; j++) {
192 y_in = (y_out + 1) + (j * 2) - n_coef_lf[filter];
196 while (y_in >= height)
199 in_lines_cur[j] = cur_data + (y_in * cur_line_stride);
202 work_line = s->work_line[jobnr];
203 switch (n_coef_lf[filter]) {
205 for (i = 0; i < linesize; i++) {
206 *work_line += *in_lines_cur[0]++ * coef_lf[filter][0];
207 *work_line++ += *in_lines_cur[1]++ * coef_lf[filter][1];
211 for (i = 0; i < linesize; i++) {
212 *work_line += *in_lines_cur[0]++ * coef_lf[filter][0];
213 *work_line += *in_lines_cur[1]++ * coef_lf[filter][1];
214 *work_line += *in_lines_cur[2]++ * coef_lf[filter][2];
215 *work_line++ += *in_lines_cur[3]++ * coef_lf[filter][3];
219 /* get high vertical frequencies from adjacent fields */
220 for (j = 0; j < n_coef_hf[filter]; j++) {
221 y_in = (y_out + 1) + (j * 2) - n_coef_hf[filter];
225 while (y_in >= height)
228 in_lines_cur[j] = cur_data + (y_in * cur_line_stride);
229 in_lines_adj[j] = adj_data + (y_in * adj_line_stride);
232 work_line = s->work_line[jobnr];
233 switch (n_coef_hf[filter]) {
235 for (i = 0; i < linesize; i++) {
236 *work_line += *in_lines_cur[0]++ * coef_hf[filter][0];
237 *work_line += *in_lines_adj[0]++ * coef_hf[filter][0];
238 *work_line += *in_lines_cur[1]++ * coef_hf[filter][1];
239 *work_line += *in_lines_adj[1]++ * coef_hf[filter][1];
240 *work_line += *in_lines_cur[2]++ * coef_hf[filter][2];
241 *work_line++ += *in_lines_adj[2]++ * coef_hf[filter][2];
245 for (i = 0; i < linesize; i++) {
246 *work_line += *in_lines_cur[0]++ * coef_hf[filter][0];
247 *work_line += *in_lines_adj[0]++ * coef_hf[filter][0];
248 *work_line += *in_lines_cur[1]++ * coef_hf[filter][1];
249 *work_line += *in_lines_adj[1]++ * coef_hf[filter][1];
250 *work_line += *in_lines_cur[2]++ * coef_hf[filter][2];
251 *work_line += *in_lines_adj[2]++ * coef_hf[filter][2];
252 *work_line += *in_lines_cur[3]++ * coef_hf[filter][3];
253 *work_line += *in_lines_adj[3]++ * coef_hf[filter][3];
254 *work_line += *in_lines_cur[4]++ * coef_hf[filter][4];
255 *work_line++ += *in_lines_adj[4]++ * coef_hf[filter][4];
259 /* save scaled result to the output frame, scaling down by 256 * 256 */
260 work_pixel = s->work_line[jobnr];
261 out_pixel = out_line;
263 for (j = 0; j < linesize; j++, out_pixel++, work_pixel++)
264 *out_pixel = av_clip(*work_pixel, 0, 255 * 256 * 256) >> 16;
266 /* move on to next line */
268 out_line += dst_line_stride * 2;
274 static int filter(AVFilterContext *ctx, int is_second)
276 W3FDIFContext *s = ctx->priv;
277 AVFilterLink *outlink = ctx->outputs[0];
282 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
284 return AVERROR(ENOMEM);
285 av_frame_copy_props(out, s->cur);
286 out->interlaced_frame = 0;
289 if (out->pts != AV_NOPTS_VALUE)
292 int64_t cur_pts = s->cur->pts;
293 int64_t next_pts = s->next->pts;
295 if (next_pts != AV_NOPTS_VALUE && cur_pts != AV_NOPTS_VALUE) {
296 out->pts = cur_pts + next_pts;
298 out->pts = AV_NOPTS_VALUE;
302 adj = s->field ? s->next : s->prev;
303 td.out = out; td.cur = s->cur; td.adj = adj;
304 for (plane = 0; plane < s->nb_planes; plane++) {
306 ctx->internal->execute(ctx, deinterlace_slice, &td, NULL, FFMIN(s->planeheight[plane], s->nb_threads));
309 s->field = !s->field;
311 return ff_filter_frame(outlink, out);
314 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
316 AVFilterContext *ctx = inlink->dst;
317 W3FDIFContext *s = ctx->priv;
320 av_frame_free(&s->prev);
326 s->cur = av_frame_clone(s->next);
328 return AVERROR(ENOMEM);
331 if ((s->deint && !s->cur->interlaced_frame) || ctx->is_disabled) {
332 AVFrame *out = av_frame_clone(s->cur);
334 return AVERROR(ENOMEM);
336 av_frame_free(&s->prev);
337 if (out->pts != AV_NOPTS_VALUE)
339 return ff_filter_frame(ctx->outputs[0], out);
345 ret = filter(ctx, 0);
349 return filter(ctx, 1);
352 static int request_frame(AVFilterLink *outlink)
354 AVFilterContext *ctx = outlink->src;
355 W3FDIFContext *s = ctx->priv;
363 ret = ff_request_frame(ctx->inputs[0]);
365 if (ret == AVERROR_EOF && s->cur) {
366 AVFrame *next = av_frame_clone(s->next);
368 return AVERROR(ENOMEM);
369 next->pts = s->next->pts * 2 - s->cur->pts;
370 filter_frame(ctx->inputs[0], next);
372 } else if (ret < 0) {
380 static av_cold void uninit(AVFilterContext *ctx)
382 W3FDIFContext *s = ctx->priv;
385 av_frame_free(&s->prev);
386 av_frame_free(&s->cur );
387 av_frame_free(&s->next);
389 for (i = 0; i < s->nb_threads; i++)
390 av_freep(&s->work_line[i]);
392 av_freep(&s->work_line);
395 static const AVFilterPad w3fdif_inputs[] = {
398 .type = AVMEDIA_TYPE_VIDEO,
399 .filter_frame = filter_frame,
400 .config_props = config_input,
405 static const AVFilterPad w3fdif_outputs[] = {
408 .type = AVMEDIA_TYPE_VIDEO,
409 .config_props = config_output,
410 .request_frame = request_frame,
415 AVFilter ff_vf_w3fdif = {
417 .description = NULL_IF_CONFIG_SMALL("Apply Martin Weston three field deinterlace."),
418 .priv_size = sizeof(W3FDIFContext),
419 .priv_class = &w3fdif_class,
421 .query_formats = query_formats,
422 .inputs = w3fdif_inputs,
423 .outputs = w3fdif_outputs,
424 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS,