/*
  * 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 AVPixelFormat pix_fmts[] = {
         AV_PIX_FMT_YUV420P,
         AV_PIX_FMT_YUV444P,
         AV_PIX_FMT_YUV440P,
         AV_PIX_FMT_YUV422P,
         AV_PIX_FMT_YUV411P,
         AV_PIX_FMT_NONE,

     };
 

     ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));

     return 0;
 }
 

 static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)

 {
     AVFilterContext *ctx = inlink->dst;
     BBoxContext *bbox = ctx->priv;
     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_filter_frame(inlink->dst->outputs[0], picref);

 }
 

 static const AVFilterPad bbox_inputs[] = {
     {
         .name             = "default",
         .type             = AVMEDIA_TYPE_VIDEO,
         .get_video_buffer = ff_null_get_video_buffer,

         .filter_frame     = filter_frame,

         .min_perms        = AV_PERM_READ,
     },
     { NULL }
 };
 
 static const AVFilterPad bbox_outputs[] = {
     {
         .name = "default",
         .type = AVMEDIA_TYPE_VIDEO,
     },
     { NULL }
 };
 

 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        = bbox_inputs,
     .outputs       = bbox_outputs,

 };