mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-27 11:51:49 +02:00
231 lines
6.2 KiB
C
231 lines
6.2 KiB
C
/*
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* Copyright (c) 2002 A'rpi
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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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/**
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* @file
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* border detection filter
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* Ported from MPlayer libmpcodecs/vf_cropdetect.c.
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*/
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#include <stdio.h>
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#include "libavutil/imgutils.h"
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#include "libavutil/internal.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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typedef struct {
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int x1, y1, x2, y2;
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int limit;
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int round;
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int reset_count;
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int frame_nb;
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int max_pixsteps[4];
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} CropDetectContext;
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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, AV_PIX_FMT_YUVJ420P,
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AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVJ422P,
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P,
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AV_PIX_FMT_YUV411P, AV_PIX_FMT_GRAY8,
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AV_PIX_FMT_NV12, AV_PIX_FMT_NV21,
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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 checkline(void *ctx, const unsigned char *src, int stride, int len, int bpp)
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{
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int total = 0;
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int div = len;
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switch (bpp) {
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case 1:
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while (--len >= 0) {
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total += src[0];
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src += stride;
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}
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break;
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case 3:
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case 4:
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while (--len >= 0) {
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total += src[0] + src[1] + src[2];
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src += stride;
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}
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div *= 3;
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break;
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}
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total /= div;
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av_log(ctx, AV_LOG_DEBUG, "total:%d\n", total);
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return total;
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}
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static av_cold int init(AVFilterContext *ctx, const char *args)
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{
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CropDetectContext *cd = ctx->priv;
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cd->limit = 24;
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cd->round = 0;
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cd->reset_count = 0;
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cd->frame_nb = -2;
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if (args)
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sscanf(args, "%d:%d:%d", &cd->limit, &cd->round, &cd->reset_count);
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av_log(ctx, AV_LOG_VERBOSE, "limit:%d round:%d reset_count:%d\n",
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cd->limit, cd->round, cd->reset_count);
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return 0;
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}
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static int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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CropDetectContext *cd = ctx->priv;
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av_image_fill_max_pixsteps(cd->max_pixsteps, NULL,
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av_pix_fmt_desc_get(inlink->format));
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cd->x1 = inlink->w - 1;
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cd->y1 = inlink->h - 1;
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cd->x2 = 0;
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cd->y2 = 0;
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *frame)
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{
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AVFilterContext *ctx = inlink->dst;
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CropDetectContext *cd = ctx->priv;
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int bpp = cd->max_pixsteps[0];
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int w, h, x, y, shrink_by;
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// ignore first 2 frames - they may be empty
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if (++cd->frame_nb > 0) {
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// Reset the crop area every reset_count frames, if reset_count is > 0
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if (cd->reset_count > 0 && cd->frame_nb > cd->reset_count) {
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cd->x1 = frame->video->w-1;
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cd->y1 = frame->video->h-1;
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cd->x2 = 0;
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cd->y2 = 0;
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cd->frame_nb = 1;
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}
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for (y = 0; y < cd->y1; y++) {
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if (checkline(ctx, frame->data[0] + frame->linesize[0] * y, bpp, frame->video->w, bpp) > cd->limit) {
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cd->y1 = y;
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break;
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}
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}
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for (y = frame->video->h-1; y > cd->y2; y--) {
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if (checkline(ctx, frame->data[0] + frame->linesize[0] * y, bpp, frame->video->w, bpp) > cd->limit) {
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cd->y2 = y;
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break;
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}
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}
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for (y = 0; y < cd->x1; y++) {
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if (checkline(ctx, frame->data[0] + bpp*y, frame->linesize[0], frame->video->h, bpp) > cd->limit) {
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cd->x1 = y;
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break;
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}
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}
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for (y = frame->video->w-1; y > cd->x2; y--) {
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if (checkline(ctx, frame->data[0] + bpp*y, frame->linesize[0], frame->video->h, bpp) > cd->limit) {
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cd->x2 = y;
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break;
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}
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}
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// round x and y (up), important for yuv colorspaces
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// make sure they stay rounded!
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x = (cd->x1+1) & ~1;
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y = (cd->y1+1) & ~1;
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w = cd->x2 - x + 1;
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h = cd->y2 - y + 1;
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// w and h must be divisible by 2 as well because of yuv
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// colorspace problems.
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if (cd->round <= 1)
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cd->round = 16;
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if (cd->round % 2)
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cd->round *= 2;
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shrink_by = w % cd->round;
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w -= shrink_by;
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x += (shrink_by/2 + 1) & ~1;
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shrink_by = h % cd->round;
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h -= shrink_by;
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y += (shrink_by/2 + 1) & ~1;
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av_log(ctx, AV_LOG_INFO,
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"x1:%d x2:%d y1:%d y2:%d w:%d h:%d x:%d y:%d pos:%"PRId64" pts:%"PRId64" t:%f crop=%d:%d:%d:%d\n",
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cd->x1, cd->x2, cd->y1, cd->y2, w, h, x, y, frame->pos, frame->pts,
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frame->pts == AV_NOPTS_VALUE ? -1 : frame->pts * av_q2d(inlink->time_base),
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w, h, x, y);
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}
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return ff_filter_frame(inlink->dst->outputs[0], frame);
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}
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static const AVFilterPad avfilter_vf_cropdetect_inputs[] = {
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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_input,
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.get_video_buffer = ff_null_get_video_buffer,
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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 avfilter_vf_cropdetect_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO
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},
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{ NULL }
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};
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AVFilter avfilter_vf_cropdetect = {
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.name = "cropdetect",
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.description = NULL_IF_CONFIG_SMALL("Auto-detect crop size."),
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.priv_size = sizeof(CropDetectContext),
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.init = init,
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.query_formats = query_formats,
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.inputs = avfilter_vf_cropdetect_inputs,
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.outputs = avfilter_vf_cropdetect_outputs,
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};
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