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 "libavutil/cpu.h"
22 #include "libavutil/common.h"
23 #include "libavutil/pixdesc.h"
39 float interlace_threshold;
40 float progressive_threshold;
46 uint8_t history[HIST_SIZE];
48 AVFilterBufferRef *cur;
49 AVFilterBufferRef *next;
50 AVFilterBufferRef *prev;
51 AVFilterBufferRef *out;
52 int (*filter_line)(const uint8_t *prev, const uint8_t *cur, const uint8_t *next, int w);
54 const AVPixFmtDescriptor *csp;
57 static const char *type2str(Type type)
60 case TFF : return "Top Field First ";
61 case BFF : return "Bottom Field First";
62 case PROGRSSIVE : return "Progressive ";
63 case UNDETERMINED: return "Undetermined ";
68 static int filter_line_c(const uint8_t *a, const uint8_t *b, const uint8_t *c, int w)
74 ret += FFABS((*a++ + *c++) - 2 * *b++);
80 static int filter_line_c_16bit(const uint16_t *a, const uint16_t *b, const uint16_t *c, int w)
86 ret += FFABS((*a++ + *c++) - 2 * *b++);
92 static void filter(AVFilterContext *ctx)
94 IDETContext *idet = ctx->priv;
101 for (i = 0; i < idet->csp->nb_components; i++) {
102 int w = idet->cur->video->w;
103 int h = idet->cur->video->h;
104 int refs = idet->cur->linesize[i];
107 w >>= idet->csp->log2_chroma_w;
108 h >>= idet->csp->log2_chroma_h;
111 for (y = 2; y < h - 2; y++) {
112 uint8_t *prev = &idet->prev->data[i][y*refs];
113 uint8_t *cur = &idet->cur ->data[i][y*refs];
114 uint8_t *next = &idet->next->data[i][y*refs];
115 alpha[ y &1] += idet->filter_line(cur-refs, prev, cur+refs, w);
116 alpha[(y^1)&1] += idet->filter_line(cur-refs, next, cur+refs, w);
117 delta += idet->filter_line(cur-refs, cur, cur+refs, w);
121 __asm__ volatile("emms \n\t" : : : "memory");
124 if (alpha[0] / (float)alpha[1] > idet->interlace_threshold){
126 }else if(alpha[1] / (float)alpha[0] > idet->interlace_threshold){
128 }else if(alpha[1] / (float)delta > idet->progressive_threshold){
134 memmove(idet->history+1, idet->history, HIST_SIZE-1);
135 idet->history[0] = type;
136 best_type = UNDETERMINED;
137 for(i=0; i<HIST_SIZE; i++){
138 if(idet->history[i] != UNDETERMINED){
139 if(best_type == UNDETERMINED)
140 best_type = idet->history[i];
142 if(idet->history[i] == best_type) {
150 if(idet->last_type == UNDETERMINED){
151 if(match ) idet->last_type = best_type;
153 if(match>2) idet->last_type = best_type;
156 if (idet->last_type == TFF){
157 idet->cur->video->top_field_first = 1;
158 idet->cur->video->interlaced = 1;
159 }else if(idet->last_type == BFF){
160 idet->cur->video->top_field_first = 0;
161 idet->cur->video->interlaced = 1;
162 }else if(idet->last_type == PROGRSSIVE){
163 idet->cur->video->interlaced = 0;
166 idet->prestat [ type] ++;
167 idet->poststat[idet->last_type] ++;
168 av_log(ctx, AV_LOG_DEBUG, "Single frame:%s, Multi frame:%s\n", type2str(type), type2str(idet->last_type));
171 static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
173 AVFilterContext *ctx = link->dst;
174 IDETContext *idet = ctx->priv;
177 avfilter_unref_buffer(idet->prev);
178 idet->prev = idet->cur;
179 idet->cur = idet->next;
186 idet->prev = avfilter_ref_buffer(idet->cur, AV_PERM_READ);
188 avfilter_start_frame(ctx->outputs[0], avfilter_ref_buffer(idet->cur, AV_PERM_READ));
191 static void end_frame(AVFilterLink *link)
193 AVFilterContext *ctx = link->dst;
194 IDETContext *idet = ctx->priv;
200 idet->csp = &av_pix_fmt_descriptors[link->format];
201 if (idet->csp->comp[0].depth_minus1 / 8 == 1)
202 idet->filter_line = (void*)filter_line_c_16bit;
206 avfilter_draw_slice(ctx->outputs[0], 0, link->h, 1);
207 avfilter_end_frame(ctx->outputs[0]);
210 static int request_frame(AVFilterLink *link)
212 AVFilterContext *ctx = link->src;
213 IDETContext *idet = ctx->priv;
218 if ((ret = avfilter_request_frame(link->src->inputs[0])))
220 } while (!idet->cur);
225 static int poll_frame(AVFilterLink *link)
227 IDETContext *idet = link->src->priv;
230 val = avfilter_poll_frame(link->src->inputs[0]);
232 if (val >= 1 && !idet->next) { //FIXME change API to not requre this red tape
233 if ((ret = avfilter_request_frame(link->src->inputs[0])) < 0)
235 val = avfilter_poll_frame(link->src->inputs[0]);
237 assert(idet->next || !val);
242 static av_cold void uninit(AVFilterContext *ctx)
244 IDETContext *idet = ctx->priv;
246 av_log(ctx, AV_LOG_INFO, "Single frame detection: TFF:%d BFF:%d Progressive:%d Undetermined:%d\n",
249 idet->prestat[PROGRSSIVE],
250 idet->prestat[UNDETERMINED]
252 av_log(ctx, AV_LOG_INFO, "Multi frame detection: TFF:%d BFF:%d Progressive:%d Undetermined:%d\n",
255 idet->poststat[PROGRSSIVE],
256 idet->poststat[UNDETERMINED]
259 if (idet->prev) avfilter_unref_buffer(idet->prev);
260 if (idet->cur ) avfilter_unref_buffer(idet->cur );
261 if (idet->next) avfilter_unref_buffer(idet->next);
264 static int query_formats(AVFilterContext *ctx)
266 static const enum PixelFormat pix_fmts[] = {
276 AV_NE( PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE ),
279 AV_NE( PIX_FMT_YUV420P10BE, PIX_FMT_YUV420P10LE ),
280 AV_NE( PIX_FMT_YUV422P10BE, PIX_FMT_YUV422P10LE ),
281 AV_NE( PIX_FMT_YUV444P10BE, PIX_FMT_YUV444P10LE ),
282 AV_NE( PIX_FMT_YUV420P16BE, PIX_FMT_YUV420P16LE ),
283 AV_NE( PIX_FMT_YUV422P16BE, PIX_FMT_YUV422P16LE ),
284 AV_NE( PIX_FMT_YUV444P16BE, PIX_FMT_YUV444P16LE ),
289 avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
294 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
296 IDETContext *idet = ctx->priv;
300 idet->interlace_threshold = 1.01;
301 idet->progressive_threshold = 2.5;
303 if (args) sscanf(args, "%f:%f", &idet->interlace_threshold, &idet->progressive_threshold);
305 idet->last_type = UNDETERMINED;
306 memset(idet->history, UNDETERMINED, HIST_SIZE);
308 idet->filter_line = filter_line_c;
313 static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
315 AVFilter avfilter_vf_idet = {
317 .description = NULL_IF_CONFIG_SMALL("Interlace detect Filter."),
319 .priv_size = sizeof(IDETContext),
322 .query_formats = query_formats,
324 .inputs = (const AVFilterPad[]) {{ .name = "default",
325 .type = AVMEDIA_TYPE_VIDEO,
326 .start_frame = start_frame,
327 .draw_slice = null_draw_slice,
328 .end_frame = end_frame,
329 .rej_perms = AV_PERM_REUSE2, },
332 .outputs = (const AVFilterPad[]) {{ .name = "default",
333 .type = AVMEDIA_TYPE_VIDEO,
334 .poll_frame = poll_frame,
335 .request_frame = request_frame, },