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
43 AVFrame *prev, *cur, *next; ///< previous, current, next frames
44 int32_t *work_line; ///< line 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 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
83 static int config_input(AVFilterLink *inlink)
85 W3FDIFContext *s = inlink->dst->priv;
86 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
89 if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
92 s->planeheight[1] = s->planeheight[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
93 s->planeheight[0] = s->planeheight[3] = inlink->h;
95 s->nb_planes = av_pix_fmt_count_planes(inlink->format);
96 s->work_line = av_calloc(s->linesize[0], sizeof(*s->work_line));
98 return AVERROR(ENOMEM);
103 static int config_output(AVFilterLink *outlink)
105 AVFilterLink *inlink = outlink->src->inputs[0];
106 W3FDIFContext *s = outlink->src->priv;
108 outlink->time_base.num = inlink->time_base.num;
109 outlink->time_base.den = inlink->time_base.den * 2;
110 outlink->frame_rate.num = inlink->frame_rate.num * 2;
111 outlink->frame_rate.den = inlink->frame_rate.den;
112 outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
113 s->ts_unit = av_q2d(av_inv_q(av_mul_q(outlink->frame_rate, outlink->time_base)));
119 * Filter coefficients from PH-2071, scaled by 256 * 256.
120 * Each set of coefficients has a set for low-frequencies and high-frequencies.
121 * n_coef_lf[] and n_coef_hf[] are the number of coefs for simple and more-complex.
122 * It is important for later that n_coef_lf[] is even and n_coef_hf[] is odd.
123 * coef_lf[][] and coef_hf[][] are the coefficients for low-frequencies
124 * and high-frequencies for simple and more-complex mode.
126 static const int8_t n_coef_lf[2] = { 2, 4 };
127 static const int32_t coef_lf[2][4] = {{ 32768, 32768, 0, 0},
128 { -1704, 34472, 34472, -1704}};
129 static const int8_t n_coef_hf[2] = { 3, 5 };
130 static const int32_t coef_hf[2][5] = {{ -4096, 8192, -4096, 0, 0},
131 { 2032, -7602, 11140, -7602, 2032}};
133 static void deinterlace_plane(AVFilterContext *ctx, AVFrame *out,
134 const AVFrame *cur, const AVFrame *adj,
135 const int filter, const int plane)
137 W3FDIFContext *s = ctx->priv;
138 uint8_t *in_line, *in_lines_cur[5], *in_lines_adj[5];
139 uint8_t *out_line, *out_pixel;
140 int32_t *work_line, *work_pixel;
141 uint8_t *cur_data = cur->data[plane];
142 uint8_t *adj_data = adj->data[plane];
143 uint8_t *dst_data = out->data[plane];
144 const int linesize = s->linesize[plane];
145 const int height = s->planeheight[plane];
146 const int cur_line_stride = cur->linesize[plane];
147 const int adj_line_stride = adj->linesize[plane];
148 const int dst_line_stride = out->linesize[plane];
149 int i, j, y_in, y_out;
151 /* copy unchanged the lines of the field */
152 y_out = s->field == cur->top_field_first;
154 in_line = cur_data + (y_out * cur_line_stride);
155 out_line = dst_data + (y_out * dst_line_stride);
157 while (y_out < height) {
158 memcpy(out_line, in_line, linesize);
160 in_line += cur_line_stride * 2;
161 out_line += dst_line_stride * 2;
164 /* interpolate other lines of the field */
165 y_out = s->field != cur->top_field_first;
167 out_line = dst_data + (y_out * dst_line_stride);
169 while (y_out < height) {
170 /* clear workspace */
171 memset(s->work_line, 0, sizeof(*s->work_line) * linesize);
173 /* get low vertical frequencies from current field */
174 for (j = 0; j < n_coef_lf[filter]; j++) {
175 y_in = (y_out + 1) + (j * 2) - n_coef_lf[filter];
179 while (y_in >= height)
182 in_lines_cur[j] = cur_data + (y_in * cur_line_stride);
185 work_line = s->work_line;
186 switch (n_coef_lf[filter]) {
188 for (i = 0; i < linesize; i++) {
189 *work_line += *in_lines_cur[0]++ * coef_lf[filter][0];
190 *work_line++ += *in_lines_cur[1]++ * coef_lf[filter][1];
194 for (i = 0; i < linesize; i++) {
195 *work_line += *in_lines_cur[0]++ * coef_lf[filter][0];
196 *work_line += *in_lines_cur[1]++ * coef_lf[filter][1];
197 *work_line += *in_lines_cur[2]++ * coef_lf[filter][2];
198 *work_line++ += *in_lines_cur[3]++ * coef_lf[filter][3];
202 /* get high vertical frequencies from adjacent fields */
203 for (j = 0; j < n_coef_hf[filter]; j++) {
204 y_in = (y_out + 1) + (j * 2) - n_coef_hf[filter];
208 while (y_in >= height)
211 in_lines_cur[j] = cur_data + (y_in * cur_line_stride);
212 in_lines_adj[j] = adj_data + (y_in * adj_line_stride);
215 work_line = s->work_line;
216 switch (n_coef_hf[filter]) {
218 for (i = 0; i < linesize; i++) {
219 *work_line += *in_lines_cur[0]++ * coef_hf[filter][0];
220 *work_line += *in_lines_adj[0]++ * coef_hf[filter][0];
221 *work_line += *in_lines_cur[1]++ * coef_hf[filter][1];
222 *work_line += *in_lines_adj[1]++ * coef_hf[filter][1];
223 *work_line += *in_lines_cur[2]++ * coef_hf[filter][2];
224 *work_line++ += *in_lines_adj[2]++ * coef_hf[filter][2];
228 for (i = 0; i < linesize; i++) {
229 *work_line += *in_lines_cur[0]++ * coef_hf[filter][0];
230 *work_line += *in_lines_adj[0]++ * coef_hf[filter][0];
231 *work_line += *in_lines_cur[1]++ * coef_hf[filter][1];
232 *work_line += *in_lines_adj[1]++ * coef_hf[filter][1];
233 *work_line += *in_lines_cur[2]++ * coef_hf[filter][2];
234 *work_line += *in_lines_adj[2]++ * coef_hf[filter][2];
235 *work_line += *in_lines_cur[3]++ * coef_hf[filter][3];
236 *work_line += *in_lines_adj[3]++ * coef_hf[filter][3];
237 *work_line += *in_lines_cur[4]++ * coef_hf[filter][4];
238 *work_line++ += *in_lines_adj[4]++ * coef_hf[filter][4];
242 /* save scaled result to the output frame, scaling down by 256 * 256 */
243 work_pixel = s->work_line;
244 out_pixel = out_line;
246 for (j = 0; j < linesize; j++, out_pixel++, work_pixel++)
247 *out_pixel = av_clip(*work_pixel, 0, 255 * 256 * 256) >> 16;
249 /* move on to next line */
251 out_line += dst_line_stride * 2;
255 static int filter(AVFilterContext *ctx)
257 W3FDIFContext *s = ctx->priv;
258 AVFilterLink *outlink = ctx->outputs[0];
262 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
264 return AVERROR(ENOMEM);
265 av_frame_copy_props(out, s->cur);
266 out->interlaced_frame = 0;
267 out->pts = outlink->frame_count * s->ts_unit;
269 adj = s->field ? s->next : s->prev;
270 for (plane = 0; plane < s->nb_planes; plane++)
271 deinterlace_plane(ctx, out, s->cur, adj, s->filter, plane);
273 s->field = !s->field;
275 return ff_filter_frame(outlink, out);
278 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
280 AVFilterContext *ctx = inlink->dst;
281 W3FDIFContext *s = ctx->priv;
284 av_frame_free(&s->prev);
290 s->cur = av_frame_clone(s->next);
292 return AVERROR(ENOMEM);
295 if ((s->deint && !s->cur->interlaced_frame) || ctx->is_disabled) {
296 AVFrame *out = av_frame_clone(s->cur);
298 return AVERROR(ENOMEM);
300 av_frame_free(&s->prev);
301 out->pts = ctx->outputs[0]->frame_count * s->ts_unit;
302 return ff_filter_frame(ctx->outputs[0], out);
315 static int request_frame(AVFilterLink *outlink)
317 AVFilterContext *ctx = outlink->src;
318 W3FDIFContext *s = ctx->priv;
326 ret = ff_request_frame(ctx->inputs[0]);
328 if (ret == AVERROR_EOF && s->cur) {
329 AVFrame *next = av_frame_clone(s->next);
331 return AVERROR(ENOMEM);
332 filter_frame(ctx->inputs[0], next);
334 } else if (ret < 0) {
342 static av_cold void uninit(AVFilterContext *ctx)
344 W3FDIFContext *s = ctx->priv;
346 av_frame_free(&s->prev);
347 av_frame_free(&s->cur );
348 av_frame_free(&s->next);
349 av_freep(&s->work_line);
352 static const AVFilterPad w3fdif_inputs[] = {
355 .type = AVMEDIA_TYPE_VIDEO,
356 .filter_frame = filter_frame,
357 .config_props = config_input,
362 static const AVFilterPad w3fdif_outputs[] = {
365 .type = AVMEDIA_TYPE_VIDEO,
366 .config_props = config_output,
367 .request_frame = request_frame,
372 AVFilter avfilter_vf_w3fdif = {
374 .description = NULL_IF_CONFIG_SMALL("Apply Martin Weston three field deinterlace."),
375 .priv_size = sizeof(W3FDIFContext),
376 .priv_class = &w3fdif_class,
378 .query_formats = query_formats,
379 .inputs = w3fdif_inputs,
380 .outputs = w3fdif_outputs,
381 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,