/*
  * Copyright (c) 2011 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

  * filter for showing textual video frame information

  */
 
 #include "libavutil/adler32.h"
 #include "libavutil/imgutils.h"

 #include "libavutil/internal.h"

 #include "libavutil/pixdesc.h"

 #include "libavutil/timestamp.h"

 #include "avfilter.h"

 #include "internal.h"

 #include "video.h"

 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)

 {
     AVFilterContext *ctx = inlink->dst;

     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);

     uint32_t plane_checksum[4] = {0}, checksum = 0;

     int i, plane, vsub = desc->log2_chroma_h;

     for (plane = 0; plane < 4 && frame->data[plane] && frame->linesize[plane]; plane++) {

         int64_t linesize = av_image_get_linesize(frame->format, frame->width, plane);

         uint8_t *data = frame->data[plane];

         int h = plane == 1 || plane == 2 ? FF_CEIL_RSHIFT(inlink->h, vsub) : inlink->h;

         if (linesize < 0)
             return linesize;
 

         for (i = 0; i < h; i++) {

             plane_checksum[plane] = av_adler32_update(plane_checksum[plane], data, linesize);
             checksum = av_adler32_update(checksum, data, linesize);

             data += frame->linesize[plane];

         }

     }
 
     av_log(ctx, AV_LOG_INFO,

            "n:%"PRId64" pts:%s pts_time:%s pos:%"PRId64" "

            "fmt:%s sar:%d/%d s:%dx%d i:%c iskey:%d type:%c "

            "checksum:%08X plane_checksum:[%08X",

            inlink->frame_count,

            av_ts2str(frame->pts), av_ts2timestr(frame->pts, &inlink->time_base), av_frame_get_pkt_pos(frame),

            desc->name,

            frame->sample_aspect_ratio.num, frame->sample_aspect_ratio.den,
            frame->width, frame->height,
            !frame->interlaced_frame ? 'P' :         /* Progressive  */
            frame->top_field_first   ? 'T' : 'B',    /* Top / Bottom */
            frame->key_frame,
            av_get_picture_type_char(frame->pict_type),

            checksum, plane_checksum[0]);
 

     for (plane = 1; plane < 4 && frame->data[plane] && frame->linesize[plane]; plane++)

         av_log(ctx, AV_LOG_INFO, " %08X", plane_checksum[plane]);
     av_log(ctx, AV_LOG_INFO, "]\n");

     return ff_filter_frame(inlink->dst->outputs[0], frame);

 }
 

 static const AVFilterPad avfilter_vf_showinfo_inputs[] = {
     {

         .name         = "default",
         .type         = AVMEDIA_TYPE_VIDEO,
         .filter_frame = filter_frame,

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

 AVFilter avfilter_vf_showinfo = {
     .name        = "showinfo",
     .description = NULL_IF_CONFIG_SMALL("Show textual information for each video frame."),

     .inputs      = avfilter_vf_showinfo_inputs,
     .outputs     = avfilter_vf_showinfo_outputs,

 };