1/* 2 * Copyright (C) 2012 Michael Niedermayer <michaelni@gmx.at> 3 * 4 * This file is part of FFmpeg. 5 * 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. 10 * 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. 15 * 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 19 */ 20 21#include <float.h> /* FLT_MAX */ 22 23#include "libavutil/cpu.h" 24#include "libavutil/common.h" 25#include "libavutil/opt.h" 26#include "libavutil/pixdesc.h" 27#include "avfilter.h" 28#include "internal.h" 29 30#define HIST_SIZE 4 31 32typedef enum { 33 TFF, 34 BFF, 35 PROGRSSIVE, 36 UNDETERMINED, 37} Type; 38 39typedef struct { 40 const AVClass *class; 41 float interlace_threshold; 42 float progressive_threshold; 43 44 Type last_type; 45 int prestat[4]; 46 int poststat[4]; 47 48 uint8_t history[HIST_SIZE]; 49 50 AVFrame *cur; 51 AVFrame *next; 52 AVFrame *prev; 53 int (*filter_line)(const uint8_t *prev, const uint8_t *cur, const uint8_t *next, int w); 54 55 const AVPixFmtDescriptor *csp; 56} IDETContext; 57 58#define OFFSET(x) offsetof(IDETContext, x) 59#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM 60 61static const AVOption idet_options[] = { 62 { "intl_thres", "set interlacing threshold", OFFSET(interlace_threshold), AV_OPT_TYPE_FLOAT, {.dbl = 1.04}, -1, FLT_MAX, FLAGS }, 63 { "prog_thres", "set progressive threshold", OFFSET(progressive_threshold), AV_OPT_TYPE_FLOAT, {.dbl = 1.5}, -1, FLT_MAX, FLAGS }, 64 { NULL } 65}; 66 67AVFILTER_DEFINE_CLASS(idet); 68 69static const char *type2str(Type type) 70{ 71 switch(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 "; 76 } 77 return NULL; 78} 79 80static int filter_line_c(const uint8_t *a, const uint8_t *b, const uint8_t *c, int w) 81{ 82 int x; 83 int ret=0; 84 85 for(x=0; x<w; x++){ 86 int v = (*a++ + *c++) - 2 * *b++; 87 ret += FFABS(v); 88 } 89 90 return ret; 91} 92 93static int filter_line_c_16bit(const uint16_t *a, const uint16_t *b, const uint16_t *c, int w) 94{ 95 int x; 96 int ret=0; 97 98 for(x=0; x<w; x++){ 99 int v = (*a++ + *c++) - 2 * *b++; 100 ret += FFABS(v); 101 } 102 103 return ret; 104} 105 106static void filter(AVFilterContext *ctx) 107{ 108 IDETContext *idet = ctx->priv; 109 int y, i; 110 int64_t alpha[2]={0}; 111 int64_t delta=0; 112 Type type, best_type; 113 int match = 0; 114 115 for (i = 0; i < idet->csp->nb_components; i++) { 116 int w = idet->cur->width; 117 int h = idet->cur->height; 118 int refs = idet->cur->linesize[i]; 119 120 if (i && i<3) { 121 w = FF_CEIL_RSHIFT(w, idet->csp->log2_chroma_w); 122 h = FF_CEIL_RSHIFT(h, idet->csp->log2_chroma_h); 123 } 124 125 for (y = 2; y < h - 2; y++) { 126 uint8_t *prev = &idet->prev->data[i][y*refs]; 127 uint8_t *cur = &idet->cur ->data[i][y*refs]; 128 uint8_t *next = &idet->next->data[i][y*refs]; 129 alpha[ y &1] += idet->filter_line(cur-refs, prev, cur+refs, w); 130 alpha[(y^1)&1] += idet->filter_line(cur-refs, next, cur+refs, w); 131 delta += idet->filter_line(cur-refs, cur, cur+refs, w); 132 } 133 } 134 135 if (alpha[0] > idet->interlace_threshold * alpha[1]){ 136 type = TFF; 137 }else if(alpha[1] > idet->interlace_threshold * alpha[0]){ 138 type = BFF; 139 }else if(alpha[1] > idet->progressive_threshold * delta){ 140 type = PROGRSSIVE; 141 }else{ 142 type = UNDETERMINED; 143 } 144 145 memmove(idet->history+1, idet->history, HIST_SIZE-1); 146 idet->history[0] = type; 147 best_type = UNDETERMINED; 148 for(i=0; i<HIST_SIZE; i++){ 149 if(idet->history[i] != UNDETERMINED){ 150 if(best_type == UNDETERMINED) 151 best_type = idet->history[i]; 152 153 if(idet->history[i] == best_type) { 154 match++; 155 }else{ 156 match=0; 157 break; 158 } 159 } 160 } 161 if(idet->last_type == UNDETERMINED){ 162 if(match ) idet->last_type = best_type; 163 }else{ 164 if(match>2) idet->last_type = best_type; 165 } 166 167 if (idet->last_type == TFF){ 168 idet->cur->top_field_first = 1; 169 idet->cur->interlaced_frame = 1; 170 }else if(idet->last_type == BFF){ 171 idet->cur->top_field_first = 0; 172 idet->cur->interlaced_frame = 1; 173 }else if(idet->last_type == PROGRSSIVE){ 174 idet->cur->interlaced_frame = 0; 175 } 176 177 idet->prestat [ type] ++; 178 idet->poststat[idet->last_type] ++; 179 av_log(ctx, AV_LOG_DEBUG, "Single frame:%s, Multi frame:%s\n", type2str(type), type2str(idet->last_type)); 180} 181 182static int filter_frame(AVFilterLink *link, AVFrame *picref) 183{ 184 AVFilterContext *ctx = link->dst; 185 IDETContext *idet = ctx->priv; 186 187 if (idet->prev) 188 av_frame_free(&idet->prev); 189 idet->prev = idet->cur; 190 idet->cur = idet->next; 191 idet->next = picref; 192 193 if (!idet->cur) 194 return 0; 195 196 if (!idet->prev) 197 idet->prev = av_frame_clone(idet->cur); 198 199 if (!idet->csp) 200 idet->csp = av_pix_fmt_desc_get(link->format); 201 if (idet->csp->comp[0].depth_minus1 / 8 == 1) 202 idet->filter_line = (void*)filter_line_c_16bit; 203 204 filter(ctx); 205 206 return ff_filter_frame(ctx->outputs[0], av_frame_clone(idet->cur)); 207} 208 209static av_cold void uninit(AVFilterContext *ctx) 210{ 211 IDETContext *idet = ctx->priv; 212 213 av_log(ctx, AV_LOG_INFO, "Single frame detection: TFF:%d BFF:%d Progressive:%d Undetermined:%d\n", 214 idet->prestat[TFF], 215 idet->prestat[BFF], 216 idet->prestat[PROGRSSIVE], 217 idet->prestat[UNDETERMINED] 218 ); 219 av_log(ctx, AV_LOG_INFO, "Multi frame detection: TFF:%d BFF:%d Progressive:%d Undetermined:%d\n", 220 idet->poststat[TFF], 221 idet->poststat[BFF], 222 idet->poststat[PROGRSSIVE], 223 idet->poststat[UNDETERMINED] 224 ); 225 226 av_frame_free(&idet->prev); 227 av_frame_free(&idet->cur ); 228 av_frame_free(&idet->next); 229} 230 231static int query_formats(AVFilterContext *ctx) 232{ 233 static const enum AVPixelFormat pix_fmts[] = { 234 AV_PIX_FMT_YUV420P, 235 AV_PIX_FMT_YUV422P, 236 AV_PIX_FMT_YUV444P, 237 AV_PIX_FMT_YUV410P, 238 AV_PIX_FMT_YUV411P, 239 AV_PIX_FMT_GRAY8, 240 AV_PIX_FMT_YUVJ420P, 241 AV_PIX_FMT_YUVJ422P, 242 AV_PIX_FMT_YUVJ444P, 243 AV_PIX_FMT_GRAY16, 244 AV_PIX_FMT_YUV440P, 245 AV_PIX_FMT_YUVJ440P, 246 AV_PIX_FMT_YUV420P10, 247 AV_PIX_FMT_YUV422P10, 248 AV_PIX_FMT_YUV444P10, 249 AV_PIX_FMT_YUV420P16, 250 AV_PIX_FMT_YUV422P16, 251 AV_PIX_FMT_YUV444P16, 252 AV_PIX_FMT_YUVA420P, 253 AV_PIX_FMT_NONE 254 }; 255 256 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); 257 258 return 0; 259} 260 261static int config_output(AVFilterLink *outlink) 262{ 263 outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP; 264 return 0; 265} 266 267static av_cold int init(AVFilterContext *ctx) 268{ 269 IDETContext *idet = ctx->priv; 270 271 idet->last_type = UNDETERMINED; 272 memset(idet->history, UNDETERMINED, HIST_SIZE); 273 274 idet->filter_line = filter_line_c; 275 276 return 0; 277} 278 279 280static const AVFilterPad idet_inputs[] = { 281 { 282 .name = "default", 283 .type = AVMEDIA_TYPE_VIDEO, 284 .filter_frame = filter_frame, 285 }, 286 { NULL } 287}; 288 289static const AVFilterPad idet_outputs[] = { 290 { 291 .name = "default", 292 .type = AVMEDIA_TYPE_VIDEO, 293 .config_props = config_output, 294 }, 295 { NULL } 296}; 297 298AVFilter ff_vf_idet = { 299 .name = "idet", 300 .description = NULL_IF_CONFIG_SMALL("Interlace detect Filter."), 301 .priv_size = sizeof(IDETContext), 302 .init = init, 303 .uninit = uninit, 304 .query_formats = query_formats, 305 .inputs = idet_inputs, 306 .outputs = idet_outputs, 307 .priv_class = &idet_class, 308}; 309