diff options
Diffstat (limited to 'libavfilter/vf_bbox.c')
-rw-r--r-- | libavfilter/vf_bbox.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/libavfilter/vf_bbox.c b/libavfilter/vf_bbox.c new file mode 100644 index 0000000000..a3b8a23758 --- /dev/null +++ b/libavfilter/vf_bbox.c @@ -0,0 +1,114 @@ +/* + * Copyright (c) 2012 Stefano Sabatini + * + * 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 + */ + +/** + * @file + * bounding box detection filter + */ + +#include "libavutil/pixdesc.h" +#include "libavutil/timestamp.h" +#include "avfilter.h" +#include "bbox.h" +#include "internal.h" + +typedef struct { + unsigned int frame; + int vsub, hsub; +} BBoxContext; + +static av_cold int init(AVFilterContext *ctx, const char *args) +{ + BBoxContext *bbox = ctx->priv; + bbox->frame = 0; + return 0; +} + +static int query_formats(AVFilterContext *ctx) +{ + static const enum PixelFormat pix_fmts[] = { + PIX_FMT_YUV420P, + PIX_FMT_YUV444P, + PIX_FMT_YUV440P, + PIX_FMT_YUV422P, + PIX_FMT_YUV411P, + PIX_FMT_NONE, + }; + + ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); + return 0; +} + +static int end_frame(AVFilterLink *inlink) +{ + AVFilterContext *ctx = inlink->dst; + BBoxContext *bbox = ctx->priv; + AVFilterBufferRef *picref = inlink->cur_buf; + FFBoundingBox box; + int has_bbox, w, h; + + has_bbox = + ff_calculate_bounding_box(&box, + picref->data[0], picref->linesize[0], + inlink->w, inlink->h, 16); + w = box.x2 - box.x1 + 1; + h = box.y2 - box.y1 + 1; + + av_log(ctx, AV_LOG_INFO, + "n:%d pts:%s pts_time:%s", bbox->frame, + av_ts2str(picref->pts), av_ts2timestr(picref->pts, &inlink->time_base)); + + if (has_bbox) { + av_log(ctx, AV_LOG_INFO, + " x1:%d x2:%d y1:%d y2:%d w:%d h:%d" + " crop=%d:%d:%d:%d drawbox=%d:%d:%d:%d", + box.x1, box.x2, box.y1, box.y2, w, h, + w, h, box.x1, box.y1, /* crop params */ + box.x1, box.y1, w, h); /* drawbox params */ + } + av_log(ctx, AV_LOG_INFO, "\n"); + + bbox->frame++; + return ff_end_frame(inlink->dst->outputs[0]); +} + +AVFilter avfilter_vf_bbox = { + .name = "bbox", + .description = NULL_IF_CONFIG_SMALL("Compute bounding box for each frame."), + .priv_size = sizeof(BBoxContext), + .query_formats = query_formats, + .init = init, + + .inputs = (const AVFilterPad[]) { + { .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .get_video_buffer = ff_null_get_video_buffer, + .start_frame = ff_null_start_frame, + .end_frame = end_frame, + .min_perms = AV_PERM_READ, }, + { .name = NULL } + }, + + .outputs = (const AVFilterPad[]) { + { .name = "default", + .type = AVMEDIA_TYPE_VIDEO }, + { .name = NULL } + }, +}; |