mirror of
https://github.com/FFmpeg/FFmpeg.git
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310 lines
8.2 KiB
C
310 lines
8.2 KiB
C
/*
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* Copyright (C) 2012 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <float.h> /* FLT_MAX */
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#include "libavutil/cpu.h"
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#include "libavutil/common.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "internal.h"
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#define HIST_SIZE 4
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typedef enum {
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TFF,
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BFF,
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PROGRSSIVE,
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UNDETERMINED,
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} Type;
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typedef struct {
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const AVClass *class;
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float interlace_threshold;
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float progressive_threshold;
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Type last_type;
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int prestat[4];
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int poststat[4];
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uint8_t history[HIST_SIZE];
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AVFrame *cur;
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AVFrame *next;
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AVFrame *prev;
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int (*filter_line)(const uint8_t *prev, const uint8_t *cur, const uint8_t *next, int w);
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const AVPixFmtDescriptor *csp;
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} IDETContext;
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#define OFFSET(x) offsetof(IDETContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption idet_options[] = {
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{ "intl_thres", "set interlacing threshold", OFFSET(interlace_threshold), AV_OPT_TYPE_FLOAT, {.dbl = 1.04}, -1, FLT_MAX, FLAGS },
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{ "prog_thres", "set progressive threshold", OFFSET(progressive_threshold), AV_OPT_TYPE_FLOAT, {.dbl = 1.5}, -1, FLT_MAX, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(idet);
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static const char *type2str(Type type)
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{
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switch(type) {
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case TFF : return "Top Field First ";
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case BFF : return "Bottom Field First";
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case PROGRSSIVE : return "Progressive ";
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case UNDETERMINED: return "Undetermined ";
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}
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return NULL;
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}
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static int filter_line_c(const uint8_t *a, const uint8_t *b, const uint8_t *c, int w)
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{
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int x;
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int ret=0;
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for(x=0; x<w; x++){
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int v = (*a++ + *c++) - 2 * *b++;
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ret += FFABS(v);
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}
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return ret;
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}
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static int filter_line_c_16bit(const uint16_t *a, const uint16_t *b, const uint16_t *c, int w)
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{
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int x;
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int ret=0;
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for(x=0; x<w; x++){
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int v = (*a++ + *c++) - 2 * *b++;
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ret += FFABS(v);
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}
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return ret;
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}
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static void filter(AVFilterContext *ctx)
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{
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IDETContext *idet = ctx->priv;
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int y, i;
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int64_t alpha[2]={0};
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int64_t delta=0;
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Type type, best_type;
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int match = 0;
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for (i = 0; i < idet->csp->nb_components; i++) {
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int w = idet->cur->width;
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int h = idet->cur->height;
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int refs = idet->cur->linesize[i];
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if (i && i<3) {
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w = FF_CEIL_RSHIFT(w, idet->csp->log2_chroma_w);
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h = FF_CEIL_RSHIFT(h, idet->csp->log2_chroma_h);
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}
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for (y = 2; y < h - 2; y++) {
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uint8_t *prev = &idet->prev->data[i][y*refs];
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uint8_t *cur = &idet->cur ->data[i][y*refs];
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uint8_t *next = &idet->next->data[i][y*refs];
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alpha[ y &1] += idet->filter_line(cur-refs, prev, cur+refs, w);
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alpha[(y^1)&1] += idet->filter_line(cur-refs, next, cur+refs, w);
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delta += idet->filter_line(cur-refs, cur, cur+refs, w);
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}
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}
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if (alpha[0] > idet->interlace_threshold * alpha[1]){
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type = TFF;
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}else if(alpha[1] > idet->interlace_threshold * alpha[0]){
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type = BFF;
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}else if(alpha[1] > idet->progressive_threshold * delta){
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type = PROGRSSIVE;
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}else{
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type = UNDETERMINED;
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}
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memmove(idet->history+1, idet->history, HIST_SIZE-1);
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idet->history[0] = type;
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best_type = UNDETERMINED;
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for(i=0; i<HIST_SIZE; i++){
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if(idet->history[i] != UNDETERMINED){
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if(best_type == UNDETERMINED)
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best_type = idet->history[i];
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if(idet->history[i] == best_type) {
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match++;
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}else{
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match=0;
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break;
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}
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}
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}
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if(idet->last_type == UNDETERMINED){
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if(match ) idet->last_type = best_type;
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}else{
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if(match>2) idet->last_type = best_type;
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}
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if (idet->last_type == TFF){
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idet->cur->top_field_first = 1;
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idet->cur->interlaced_frame = 1;
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}else if(idet->last_type == BFF){
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idet->cur->top_field_first = 0;
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idet->cur->interlaced_frame = 1;
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}else if(idet->last_type == PROGRSSIVE){
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idet->cur->interlaced_frame = 0;
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}
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idet->prestat [ type] ++;
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idet->poststat[idet->last_type] ++;
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av_log(ctx, AV_LOG_DEBUG, "Single frame:%s, Multi frame:%s\n", type2str(type), type2str(idet->last_type));
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}
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static int filter_frame(AVFilterLink *link, AVFrame *picref)
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{
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AVFilterContext *ctx = link->dst;
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IDETContext *idet = ctx->priv;
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if (idet->prev)
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av_frame_free(&idet->prev);
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idet->prev = idet->cur;
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idet->cur = idet->next;
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idet->next = picref;
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if (!idet->cur)
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return 0;
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if (!idet->prev)
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idet->prev = av_frame_clone(idet->cur);
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if (!idet->csp)
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idet->csp = av_pix_fmt_desc_get(link->format);
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if (idet->csp->comp[0].depth_minus1 / 8 == 1)
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idet->filter_line = (void*)filter_line_c_16bit;
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filter(ctx);
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return ff_filter_frame(ctx->outputs[0], av_frame_clone(idet->cur));
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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IDETContext *idet = ctx->priv;
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av_log(ctx, AV_LOG_INFO, "Single frame detection: TFF:%d BFF:%d Progressive:%d Undetermined:%d\n",
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idet->prestat[TFF],
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idet->prestat[BFF],
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idet->prestat[PROGRSSIVE],
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idet->prestat[UNDETERMINED]
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);
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av_log(ctx, AV_LOG_INFO, "Multi frame detection: TFF:%d BFF:%d Progressive:%d Undetermined:%d\n",
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idet->poststat[TFF],
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idet->poststat[BFF],
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idet->poststat[PROGRSSIVE],
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idet->poststat[UNDETERMINED]
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);
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av_frame_free(&idet->prev);
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av_frame_free(&idet->cur );
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av_frame_free(&idet->next);
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}
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_YUV420P,
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AV_PIX_FMT_YUV422P,
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AV_PIX_FMT_YUV444P,
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AV_PIX_FMT_YUV410P,
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AV_PIX_FMT_YUV411P,
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AV_PIX_FMT_GRAY8,
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AV_PIX_FMT_YUVJ420P,
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AV_PIX_FMT_YUVJ422P,
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AV_PIX_FMT_YUVJ444P,
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AV_PIX_FMT_GRAY16,
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AV_PIX_FMT_YUV440P,
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AV_PIX_FMT_YUVJ440P,
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AV_PIX_FMT_YUV420P10,
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AV_PIX_FMT_YUV422P10,
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AV_PIX_FMT_YUV444P10,
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AV_PIX_FMT_YUV420P16,
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AV_PIX_FMT_YUV422P16,
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AV_PIX_FMT_YUV444P16,
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AV_PIX_FMT_YUVA420P,
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AV_PIX_FMT_NONE
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};
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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return 0;
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}
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static int config_output(AVFilterLink *outlink)
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{
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outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
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return 0;
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}
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static av_cold int init(AVFilterContext *ctx)
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{
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IDETContext *idet = ctx->priv;
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idet->last_type = UNDETERMINED;
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memset(idet->history, UNDETERMINED, HIST_SIZE);
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idet->filter_line = filter_line_c;
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return 0;
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}
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static const AVFilterPad idet_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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},
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{ NULL }
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};
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static const AVFilterPad idet_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_output,
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},
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{ NULL }
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};
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AVFilter avfilter_vf_idet = {
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.name = "idet",
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.description = NULL_IF_CONFIG_SMALL("Interlace detect Filter."),
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.priv_size = sizeof(IDETContext),
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.init = init,
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = idet_inputs,
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.outputs = idet_outputs,
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.priv_class = &idet_class,
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};
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