2 * Copyright (C) 2012 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of FFmpeg.
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.
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.
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
21 #include <float.h> /* FLT_MAX */
23 #include "libavutil/cpu.h"
24 #include "libavutil/common.h"
25 #include "libavutil/opt.h"
26 #include "libavutil/pixdesc.h"
41 float interlace_threshold;
42 float progressive_threshold;
48 uint8_t history[HIST_SIZE];
50 AVFilterBufferRef *cur;
51 AVFilterBufferRef *next;
52 AVFilterBufferRef *prev;
53 int (*filter_line)(const uint8_t *prev, const uint8_t *cur, const uint8_t *next, int w);
55 const AVPixFmtDescriptor *csp;
58 #define OFFSET(x) offsetof(IDETContext, x)
59 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
61 static const AVOption idet_options[] = {
62 { "intl_thres", "set interlacing threshold", OFFSET(interlace_threshold), AV_OPT_TYPE_FLOAT, {.dbl = 1.01}, -1, FLT_MAX, FLAGS },
63 { "prog_thres", "set progressive threshold", OFFSET(progressive_threshold), AV_OPT_TYPE_FLOAT, {.dbl = 2.5}, -1, FLT_MAX, FLAGS },
67 AVFILTER_DEFINE_CLASS(idet);
69 static const char *type2str(Type type)
72 case TFF : return "Top Field First ";
73 case BFF : return "Bottom Field First";
74 case PROGRSSIVE : return "Progressive ";
75 case UNDETERMINED: return "Undetermined ";
80 static int filter_line_c(const uint8_t *a, const uint8_t *b, const uint8_t *c, int w)
86 ret += FFABS((*a++ + *c++) - 2 * *b++);
92 static int filter_line_c_16bit(const uint16_t *a, const uint16_t *b, const uint16_t *c, int w)
98 ret += FFABS((*a++ + *c++) - 2 * *b++);
104 static void filter(AVFilterContext *ctx)
106 IDETContext *idet = ctx->priv;
108 int64_t alpha[2]={0};
110 Type type, best_type;
113 for (i = 0; i < idet->csp->nb_components; i++) {
114 int w = idet->cur->video->w;
115 int h = idet->cur->video->h;
116 int refs = idet->cur->linesize[i];
119 w >>= idet->csp->log2_chroma_w;
120 h >>= idet->csp->log2_chroma_h;
123 for (y = 2; y < h - 2; y++) {
124 uint8_t *prev = &idet->prev->data[i][y*refs];
125 uint8_t *cur = &idet->cur ->data[i][y*refs];
126 uint8_t *next = &idet->next->data[i][y*refs];
127 alpha[ y &1] += idet->filter_line(cur-refs, prev, cur+refs, w);
128 alpha[(y^1)&1] += idet->filter_line(cur-refs, next, cur+refs, w);
129 delta += idet->filter_line(cur-refs, cur, cur+refs, w);
133 if (alpha[0] > idet->interlace_threshold * alpha[1]){
135 }else if(alpha[1] > idet->interlace_threshold * alpha[0]){
137 }else if(alpha[1] > idet->progressive_threshold * delta){
143 memmove(idet->history+1, idet->history, HIST_SIZE-1);
144 idet->history[0] = type;
145 best_type = UNDETERMINED;
146 for(i=0; i<HIST_SIZE; i++){
147 if(idet->history[i] != UNDETERMINED){
148 if(best_type == UNDETERMINED)
149 best_type = idet->history[i];
151 if(idet->history[i] == best_type) {
159 if(idet->last_type == UNDETERMINED){
160 if(match ) idet->last_type = best_type;
162 if(match>2) idet->last_type = best_type;
165 if (idet->last_type == TFF){
166 idet->cur->video->top_field_first = 1;
167 idet->cur->video->interlaced = 1;
168 }else if(idet->last_type == BFF){
169 idet->cur->video->top_field_first = 0;
170 idet->cur->video->interlaced = 1;
171 }else if(idet->last_type == PROGRSSIVE){
172 idet->cur->video->interlaced = 0;
175 idet->prestat [ type] ++;
176 idet->poststat[idet->last_type] ++;
177 av_log(ctx, AV_LOG_DEBUG, "Single frame:%s, Multi frame:%s\n", type2str(type), type2str(idet->last_type));
180 static int filter_frame(AVFilterLink *link, AVFilterBufferRef *picref)
182 AVFilterContext *ctx = link->dst;
183 IDETContext *idet = ctx->priv;
186 avfilter_unref_buffer(idet->prev);
187 idet->prev = idet->cur;
188 idet->cur = idet->next;
195 idet->prev = avfilter_ref_buffer(idet->cur, ~0);
198 idet->csp = av_pix_fmt_desc_get(link->format);
199 if (idet->csp->comp[0].depth_minus1 / 8 == 1)
200 idet->filter_line = (void*)filter_line_c_16bit;
204 return ff_filter_frame(ctx->outputs[0], avfilter_ref_buffer(idet->cur, ~0));
207 static int request_frame(AVFilterLink *link)
209 AVFilterContext *ctx = link->src;
210 IDETContext *idet = ctx->priv;
215 if ((ret = ff_request_frame(link->src->inputs[0])))
217 } while (!idet->cur);
222 static av_cold void uninit(AVFilterContext *ctx)
224 IDETContext *idet = ctx->priv;
226 av_log(ctx, AV_LOG_INFO, "Single frame detection: TFF:%d BFF:%d Progressive:%d Undetermined:%d\n",
229 idet->prestat[PROGRSSIVE],
230 idet->prestat[UNDETERMINED]
232 av_log(ctx, AV_LOG_INFO, "Multi frame detection: TFF:%d BFF:%d Progressive:%d Undetermined:%d\n",
235 idet->poststat[PROGRSSIVE],
236 idet->poststat[UNDETERMINED]
239 avfilter_unref_bufferp(&idet->prev);
240 avfilter_unref_bufferp(&idet->cur );
241 avfilter_unref_bufferp(&idet->next);
244 static int query_formats(AVFilterContext *ctx)
246 static const enum AVPixelFormat pix_fmts[] = {
256 AV_NE( AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_GRAY16LE ),
259 AV_NE( AV_PIX_FMT_YUV420P10BE, AV_PIX_FMT_YUV420P10LE ),
260 AV_NE( AV_PIX_FMT_YUV422P10BE, AV_PIX_FMT_YUV422P10LE ),
261 AV_NE( AV_PIX_FMT_YUV444P10BE, AV_PIX_FMT_YUV444P10LE ),
262 AV_NE( AV_PIX_FMT_YUV420P16BE, AV_PIX_FMT_YUV420P16LE ),
263 AV_NE( AV_PIX_FMT_YUV422P16BE, AV_PIX_FMT_YUV422P16LE ),
264 AV_NE( AV_PIX_FMT_YUV444P16BE, AV_PIX_FMT_YUV444P16LE ),
269 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
274 static av_cold int init(AVFilterContext *ctx, const char *args)
276 IDETContext *idet = ctx->priv;
277 static const char *shorthand[] = { "intl_thres", "prog_thres", NULL };
280 idet->class = &idet_class;
281 av_opt_set_defaults(idet);
283 if ((ret = av_opt_set_from_string(idet, args, shorthand, "=", ":")) < 0)
286 idet->last_type = UNDETERMINED;
287 memset(idet->history, UNDETERMINED, HIST_SIZE);
289 idet->filter_line = filter_line_c;
295 static const AVFilterPad idet_inputs[] = {
298 .type = AVMEDIA_TYPE_VIDEO,
299 .filter_frame = filter_frame,
300 .min_perms = AV_PERM_PRESERVE,
305 static const AVFilterPad idet_outputs[] = {
308 .type = AVMEDIA_TYPE_VIDEO,
309 .rej_perms = AV_PERM_WRITE,
310 .request_frame = request_frame,
315 AVFilter avfilter_vf_idet = {
317 .description = NULL_IF_CONFIG_SMALL("Interlace detect Filter."),
319 .priv_size = sizeof(IDETContext),
322 .query_formats = query_formats,
323 .inputs = idet_inputs,
324 .outputs = idet_outputs,
325 .priv_class = &idet_class,