mirror of https://github.com/FFmpeg/FFmpeg.git
Also add bbox.h and bbox.c files, based on the remove-logo filter by Robert Edele. These files are useful for sharing code with the pending removelogo port.pull/3/merge
parent
32a5775a91
commit
3225bc37a3
8 changed files with 247 additions and 2 deletions
@ -0,0 +1,75 @@ |
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/*
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* Copyright (c) 2005 Robert Edele <yartrebo@earthlink.net> |
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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 "bbox.h" |
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int ff_calculate_bounding_box(FFBoundingBox *bbox, |
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const uint8_t *data, int linesize, int w, int h, |
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int min_val) |
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{ |
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int x, y; |
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int start_x; |
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int start_y; |
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int end_x = w - 1; |
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int end_y = h - 1; |
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const uint8_t *line; |
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/* left bound */ |
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for (start_x = 0; start_x < w; start_x++) |
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for (y = 0; y < h; y++) |
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if ((data[y * linesize + start_x] > min_val)) |
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goto outl; |
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outl: |
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if (start_x == w) /* no points found */ |
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return 0; |
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/* right bound */ |
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for (end_x = w - 1; end_x >= start_x; end_x--) |
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for (y = 0; y < h; y++) |
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if ((data[y * linesize + end_x] > min_val)) |
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goto outr; |
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outr: |
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/* top bound */ |
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line = data; |
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for (start_y = 0; start_y < h; start_y++) { |
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for (x = 0; x < w; x++) |
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if (line[x] > min_val) |
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goto outt; |
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line += linesize; |
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} |
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outt: |
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/* bottom bound */ |
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line = data + (h-1)*linesize; |
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for (end_y = h - 1; end_y >= start_y; end_y--) { |
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for (x = 0; x < w; x++) |
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if (line[x] > min_val) |
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goto outb; |
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line -= linesize; |
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} |
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outb: |
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bbox->x1 = start_x; |
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bbox->y1 = start_y; |
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bbox->x2 = end_x; |
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bbox->y2 = end_y; |
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return 1; |
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} |
@ -0,0 +1,44 @@ |
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/*
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* Copyright (c) 2005 Robert Edele <yartrebo@earthlink.net> |
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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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#ifndef AVFILTER_BBOX_H |
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#define AVFILTER_BBOX_H |
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#include <stdint.h> |
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typedef struct { |
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int x1, x2, y1, y2; |
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} FFBoundingBox; |
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/**
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* Calculate the smallest rectangle that will encompass the |
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* region with values > min_val. |
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* |
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* @param bbox bounding box structure which is updated with the found values. |
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* If no pixels could be found with value > min_val, the |
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* structure is not modified. |
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* @return 1 in case at least one pixel with value > min_val was found, |
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* 0 otherwise |
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*/ |
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int ff_calculate_bounding_box(FFBoundingBox *bbox, |
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const uint8_t *data, int linesize, |
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int w, int h, int min_val); |
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#endif /* AVFILTER_BBOX_H */ |
@ -0,0 +1,113 @@ |
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/*
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* Copyright (c) 2012 Stefano Sabatini |
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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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/**
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* @file |
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* bounding box detection filter |
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*/ |
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#include "libavutil/pixdesc.h" |
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#include "libavutil/timestamp.h" |
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#include "avfilter.h" |
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#include "bbox.h" |
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typedef struct { |
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unsigned int frame; |
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int vsub, hsub; |
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} BBoxContext; |
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) |
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{ |
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BBoxContext *bbox = ctx->priv; |
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bbox->frame = 0; |
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return 0; |
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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 PixelFormat pix_fmts[] = { |
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PIX_FMT_YUV420P, |
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PIX_FMT_YUV444P, |
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PIX_FMT_YUV440P, |
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PIX_FMT_YUV422P, |
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PIX_FMT_YUV411P, |
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PIX_FMT_NONE, |
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}; |
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avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts)); |
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return 0; |
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} |
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static void end_frame(AVFilterLink *inlink) |
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{ |
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AVFilterContext *ctx = inlink->dst; |
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BBoxContext *bbox = ctx->priv; |
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AVFilterBufferRef *picref = inlink->cur_buf; |
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FFBoundingBox box; |
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int has_bbox, w, h; |
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has_bbox = |
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ff_calculate_bounding_box(&box, |
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picref->data[0], picref->linesize[0], |
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inlink->w, inlink->h, 16); |
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w = box.x2 - box.x1 + 1; |
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h = box.y2 - box.y1 + 1; |
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av_log(ctx, AV_LOG_INFO, |
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"n:%d pts:%s pts_time:%s", bbox->frame, |
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av_ts2str(picref->pts), av_ts2timestr(picref->pts, &inlink->time_base)); |
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if (has_bbox) { |
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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" |
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" crop=%d:%d:%d:%d drawbox=%d:%d:%d:%d", |
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box.x1, box.x2, box.y1, box.y2, w, h, |
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w, h, box.x1, box.y1, /* crop params */ |
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box.x1, box.y1, w, h); /* drawbox params */ |
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} |
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av_log(ctx, AV_LOG_INFO, "\n"); |
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bbox->frame++; |
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avfilter_end_frame(inlink->dst->outputs[0]); |
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} |
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AVFilter avfilter_vf_bbox = { |
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.name = "bbox", |
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.description = NULL_IF_CONFIG_SMALL("Compute bounding box for each frame."), |
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.priv_size = sizeof(BBoxContext), |
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.query_formats = query_formats, |
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.init = init, |
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.inputs = (const AVFilterPad[]) { |
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{ .name = "default", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.get_video_buffer = avfilter_null_get_video_buffer, |
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.start_frame = avfilter_null_start_frame, |
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.end_frame = end_frame, |
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.min_perms = AV_PERM_READ, }, |
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{ .name = NULL } |
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}, |
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.outputs = (const AVFilterPad[]) { |
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{ .name = "default", |
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.type = AVMEDIA_TYPE_VIDEO }, |
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{ .name = NULL } |
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}, |
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}; |
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