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