| /* |
| * 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]; |
| |
| AVFilterBufferRef *cur; |
| AVFilterBufferRef *next; |
| AVFilterBufferRef *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 = 1.01}, -1, FLT_MAX, FLAGS }, |
| { "prog_thres", "set progressive threshold", OFFSET(progressive_threshold), AV_OPT_TYPE_FLOAT, {.dbl = 2.5}, -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++){ |
| ret += FFABS((*a++ + *c++) - 2 * *b++); |
| } |
| |
| 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++){ |
| ret += FFABS((*a++ + *c++) - 2 * *b++); |
| } |
| |
| 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->video->w; |
| int h = idet->cur->video->h; |
| int refs = idet->cur->linesize[i]; |
| |
| if (i && i<3) { |
| w >>= idet->csp->log2_chroma_w; |
| 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->video->top_field_first = 1; |
| idet->cur->video->interlaced = 1; |
| }else if(idet->last_type == BFF){ |
| idet->cur->video->top_field_first = 0; |
| idet->cur->video->interlaced = 1; |
| }else if(idet->last_type == PROGRSSIVE){ |
| idet->cur->video->interlaced = 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, AVFilterBufferRef *picref) |
| { |
| AVFilterContext *ctx = link->dst; |
| IDETContext *idet = ctx->priv; |
| |
| if (idet->prev) |
| avfilter_unref_buffer(idet->prev); |
| idet->prev = idet->cur; |
| idet->cur = idet->next; |
| idet->next = picref; |
| |
| if (!idet->cur) |
| return 0; |
| |
| if (!idet->prev) |
| idet->prev = avfilter_ref_buffer(idet->cur, ~0); |
| |
| 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], avfilter_ref_buffer(idet->cur, ~0)); |
| } |
| |
| static int request_frame(AVFilterLink *link) |
| { |
| AVFilterContext *ctx = link->src; |
| IDETContext *idet = ctx->priv; |
| |
| do { |
| int ret; |
| |
| if ((ret = ff_request_frame(link->src->inputs[0]))) |
| return ret; |
| } while (!idet->cur); |
| |
| return 0; |
| } |
| |
| 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] |
| ); |
| |
| avfilter_unref_bufferp(&idet->prev); |
| avfilter_unref_bufferp(&idet->cur ); |
| avfilter_unref_bufferp(&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_NE( AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_GRAY16LE ), |
| AV_PIX_FMT_YUV440P, |
| AV_PIX_FMT_YUVJ440P, |
| AV_NE( AV_PIX_FMT_YUV420P10BE, AV_PIX_FMT_YUV420P10LE ), |
| AV_NE( AV_PIX_FMT_YUV422P10BE, AV_PIX_FMT_YUV422P10LE ), |
| AV_NE( AV_PIX_FMT_YUV444P10BE, AV_PIX_FMT_YUV444P10LE ), |
| AV_NE( AV_PIX_FMT_YUV420P16BE, AV_PIX_FMT_YUV420P16LE ), |
| AV_NE( AV_PIX_FMT_YUV422P16BE, AV_PIX_FMT_YUV422P16LE ), |
| AV_NE( AV_PIX_FMT_YUV444P16BE, AV_PIX_FMT_YUV444P16LE ), |
| AV_PIX_FMT_YUVA420P, |
| AV_PIX_FMT_NONE |
| }; |
| |
| ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); |
| |
| return 0; |
| } |
| |
| static av_cold int init(AVFilterContext *ctx, const char *args) |
| { |
| IDETContext *idet = ctx->priv; |
| static const char *shorthand[] = { "intl_thres", "prog_thres", NULL }; |
| int ret; |
| |
| idet->class = &idet_class; |
| av_opt_set_defaults(idet); |
| |
| if ((ret = av_opt_set_from_string(idet, args, shorthand, "=", ":")) < 0) |
| return ret; |
| |
| 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, |
| .min_perms = AV_PERM_PRESERVE, |
| }, |
| { NULL } |
| }; |
| |
| static const AVFilterPad idet_outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .rej_perms = AV_PERM_WRITE, |
| .request_frame = request_frame, |
| }, |
| { 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, |
| }; |