2 * Copyright (C) 2006-2010 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (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
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License along
17 * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 #include "libavutil/cpu.h"
22 #include "libavutil/x86_cpu.h"
23 #include "libavutil/common.h"
32 * 0: send 1 frame for each frame
33 * 1: send 1 frame for each field
34 * 2: like 0 but skips spatial interlacing check
35 * 3: like 1 but skips spatial interlacing check
40 * 0: bottom field first
48 AVFilterBufferRef *cur;
49 AVFilterBufferRef *next;
50 AVFilterBufferRef *prev;
51 AVFilterBufferRef *out;
52 void (*filter_line)(uint8_t *dst,
53 uint8_t *prev, uint8_t *cur, uint8_t *next,
54 int w, int refs, int parity, int mode);
57 static void filter_line_c(uint8_t *dst,
58 uint8_t *prev, uint8_t *cur, uint8_t *next,
59 int w, int refs, int parity, int mode)
62 uint8_t *prev2 = parity ? prev : cur ;
63 uint8_t *next2 = parity ? cur : next;
64 for (x = 0; x < w; x++) {
66 int d = (prev2[0] + next2[0])>>1;
68 int temporal_diff0 = FFABS(prev2[0] - next2[0]);
69 int temporal_diff1 =(FFABS(prev[-refs] - c) + FFABS(prev[+refs] - e) )>>1;
70 int temporal_diff2 =(FFABS(next[-refs] - c) + FFABS(next[+refs] - e) )>>1;
71 int diff = FFMAX3(temporal_diff0>>1, temporal_diff1, temporal_diff2);
72 int spatial_pred = (c+e)>>1;
73 int spatial_score = FFABS(cur[-refs-1] - cur[+refs-1]) + FFABS(c-e)
74 + FFABS(cur[-refs+1] - cur[+refs+1]) - 1;
77 { int score = FFABS(cur[-refs-1+j] - cur[+refs-1-j])\
78 + FFABS(cur[-refs +j] - cur[+refs -j])\
79 + FFABS(cur[-refs+1+j] - cur[+refs+1-j]);\
80 if (score < spatial_score) {\
81 spatial_score= score;\
82 spatial_pred= (cur[-refs +j] + cur[+refs -j])>>1;\
84 CHECK(-1) CHECK(-2) }} }}
85 CHECK( 1) CHECK( 2) }} }}
88 int b = (prev2[-2*refs] + next2[-2*refs])>>1;
89 int f = (prev2[+2*refs] + next2[+2*refs])>>1;
93 int max = FFMAX3(d-e, d-c, FFMIN3(FFMAX(b-c,f-e),FFMAX(b-c,b-a),FFMAX(f-g,f-e)) );
94 int min = FFMIN3(d-e, d-c, FFMAX3(FFMIN(b-c,f-e),FFMIN(b-c,b-a),FFMIN(f-g,f-e)) );
96 int max = FFMAX3(d-e, d-c, FFMIN(b-c, f-e));
97 int min = FFMIN3(d-e, d-c, FFMAX(b-c, f-e));
100 diff = FFMAX3(diff, min, -max);
103 if (spatial_pred > d + diff)
104 spatial_pred = d + diff;
105 else if (spatial_pred < d - diff)
106 spatial_pred = d - diff;
108 dst[0] = spatial_pred;
119 static void filter(AVFilterContext *ctx, AVFilterBufferRef *dstpic,
122 YADIFContext *yadif = ctx->priv;
125 for (i = 0; i < 3; i++) {
127 int w = dstpic->video->w >> is_chroma;
128 int h = dstpic->video->h >> is_chroma;
129 int refs = yadif->cur->linesize[i];
131 for (y = 0; y < h; y++) {
132 if ((y ^ parity) & 1) {
133 uint8_t *prev = &yadif->prev->data[i][y*refs];
134 uint8_t *cur = &yadif->cur ->data[i][y*refs];
135 uint8_t *next = &yadif->next->data[i][y*refs];
136 uint8_t *dst = &dstpic->data[i][y*dstpic->linesize[i]];
137 yadif->filter_line(dst, prev, cur, next, w, refs, parity ^ tff, yadif->mode);
139 memcpy(&dstpic->data[i][y*dstpic->linesize[i]],
140 &yadif->cur->data[i][y*refs], w);
145 __asm__ volatile("emms \n\t" : : : "memory");
149 static AVFilterBufferRef *get_video_buffer(AVFilterLink *link, int perms, int w, int h)
151 AVFilterBufferRef *picref;
152 int width = FFALIGN(w, 32);
153 int height= FFALIGN(h+6, 32);
156 picref = avfilter_default_get_video_buffer(link, perms, width, height);
158 picref->video->w = w;
159 picref->video->h = h;
161 for (i = 0; i < 3; i++)
162 picref->data[i] += 3 * picref->linesize[i];
167 static void return_frame(AVFilterContext *ctx, int is_second)
169 YADIFContext *yadif = ctx->priv;
170 AVFilterLink *link= ctx->outputs[0];
171 int tff = yadif->parity == -1 ? yadif->cur->video->top_field_first : (yadif->parity^1);
174 yadif->out = avfilter_get_video_buffer(link, AV_PERM_WRITE | AV_PERM_PRESERVE |
175 AV_PERM_REUSE, link->w, link->h);
177 filter(ctx, yadif->out, tff ^ !is_second, tff);
180 avfilter_start_frame(ctx->outputs[0], yadif->out);
181 avfilter_draw_slice(ctx->outputs[0], 0, link->h, 1);
182 avfilter_end_frame(ctx->outputs[0]);
184 yadif->frame_pending = (yadif->mode&1) && !is_second;
187 static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
189 AVFilterContext *ctx = link->dst;
190 YADIFContext *yadif = ctx->priv;
192 if (yadif->frame_pending)
193 return_frame(ctx, 1);
196 avfilter_unref_buffer(yadif->prev);
197 yadif->prev = yadif->cur;
198 yadif->cur = yadif->next;
199 yadif->next = picref;
205 yadif->prev = avfilter_ref_buffer(yadif->cur, AV_PERM_READ);
207 yadif->out = avfilter_get_video_buffer(ctx->outputs[0], AV_PERM_WRITE | AV_PERM_PRESERVE |
208 AV_PERM_REUSE, link->w, link->h);
210 yadif->out->pts = yadif->cur->pts;
211 avfilter_start_frame(ctx->outputs[0], yadif->out);
214 static void end_frame(AVFilterLink *link)
216 AVFilterContext *ctx = link->dst;
217 YADIFContext *yadif = ctx->priv;
222 return_frame(ctx, 0);
225 static int request_frame(AVFilterLink *link)
227 AVFilterContext *ctx = link->src;
228 YADIFContext *yadif = ctx->priv;
230 if (yadif->frame_pending) {
231 return_frame(ctx, 1);
238 if ((ret = avfilter_request_frame(link->src->inputs[0])))
240 } while (!yadif->cur);
245 static int poll_frame(AVFilterLink *link)
247 YADIFContext *yadif = link->src->priv;
250 if (yadif->frame_pending)
253 val = avfilter_poll_frame(link->src->inputs[0]);
255 if (val==1 && !yadif->next) { //FIXME change API to not requre this red tape
256 if ((ret = avfilter_request_frame(link->src->inputs[0])) < 0)
258 val = avfilter_poll_frame(link->src->inputs[0]);
262 return val * ((yadif->mode&1)+1);
265 static av_cold void uninit(AVFilterContext *ctx)
267 YADIFContext *yadif = ctx->priv;
269 if (yadif->prev) avfilter_unref_buffer(yadif->prev);
270 if (yadif->cur ) avfilter_unref_buffer(yadif->cur );
271 if (yadif->next) avfilter_unref_buffer(yadif->next);
274 static int query_formats(AVFilterContext *ctx)
276 static const enum PixelFormat pix_fmts[] = {
282 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
287 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
289 YADIFContext *yadif = ctx->priv;
290 av_unused int cpu_flags = av_get_cpu_flags();
295 if (args) sscanf(args, "%d:%d", &yadif->mode, &yadif->parity);
297 yadif->filter_line = filter_line_c;
299 if (cpu_flags & AV_CPU_FLAG_MMX)
300 yadif->filter_line = ff_yadif_filter_line_mmx;
303 av_log(ctx, AV_LOG_INFO, "mode:%d parity:%d\n", yadif->mode, yadif->parity);
308 static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
310 AVFilter avfilter_vf_yadif = {
312 .description = NULL_IF_CONFIG_SMALL("Deinterlace the input image"),
314 .priv_size = sizeof(YADIFContext),
317 .query_formats = query_formats,
319 .inputs = (AVFilterPad[]) {{ .name = "default",
320 .type = AVMEDIA_TYPE_VIDEO,
321 .start_frame = start_frame,
322 .get_video_buffer = get_video_buffer,
323 .draw_slice = null_draw_slice,
324 .end_frame = end_frame, },
327 .outputs = (AVFilterPad[]) {{ .name = "default",
328 .type = AVMEDIA_TYPE_VIDEO,
329 .poll_frame = poll_frame,
330 .request_frame = request_frame, },