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vf_showinfo.c
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1 /*
2  * Copyright (c) 2011 Stefano Sabatini
3  * This file is part of FFmpeg.
4  *
5  * FFmpeg is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Lesser General Public
7  * License as published by the Free Software Foundation; either
8  * version 2.1 of the License, or (at your option) any later version.
9  *
10  * FFmpeg is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  * Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General Public
16  * License along with FFmpeg; if not, write to the Free Software
17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18  */
19 
20 /**
21  * @file
22  * filter for showing textual video frame information
23  */
24 
25 #include "libavutil/adler32.h"
26 #include "libavutil/imgutils.h"
27 #include "libavutil/internal.h"
28 #include "libavutil/pixdesc.h"
29 #include "libavutil/timestamp.h"
30 #include "avfilter.h"
31 #include "internal.h"
32 #include "video.h"
33 
34 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
35 {
36  AVFilterContext *ctx = inlink->dst;
37  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
38  uint32_t plane_checksum[4] = {0}, checksum = 0;
39  int i, plane, vsub = desc->log2_chroma_h;
40 
41  for (plane = 0; plane < 4 && frame->data[plane]; plane++) {
42  int64_t linesize = av_image_get_linesize(frame->format, frame->width, plane);
43  uint8_t *data = frame->data[plane];
44  int h = plane == 1 || plane == 2 ? FF_CEIL_RSHIFT(inlink->h, vsub) : inlink->h;
45 
46  if (linesize < 0)
47  return linesize;
48 
49  for (i = 0; i < h; i++) {
50  plane_checksum[plane] = av_adler32_update(plane_checksum[plane], data, linesize);
51  checksum = av_adler32_update(checksum, data, linesize);
52  data += frame->linesize[plane];
53  }
54  }
55 
56  av_log(ctx, AV_LOG_INFO,
57  "n:%"PRId64" pts:%s pts_time:%s pos:%"PRId64" "
58  "fmt:%s sar:%d/%d s:%dx%d i:%c iskey:%d type:%c "
59  "checksum:%08X plane_checksum:[%08X",
60  inlink->frame_count,
61  av_ts2str(frame->pts), av_ts2timestr(frame->pts, &inlink->time_base), av_frame_get_pkt_pos(frame),
62  desc->name,
64  frame->width, frame->height,
65  !frame->interlaced_frame ? 'P' : /* Progressive */
66  frame->top_field_first ? 'T' : 'B', /* Top / Bottom */
67  frame->key_frame,
69  checksum, plane_checksum[0]);
70 
71  for (plane = 1; plane < 4 && frame->data[plane]; plane++)
72  av_log(ctx, AV_LOG_INFO, " %08X", plane_checksum[plane]);
73  av_log(ctx, AV_LOG_INFO, "]\n");
74 
75  return ff_filter_frame(inlink->dst->outputs[0], frame);
76 }
77 
79  {
80  .name = "default",
81  .type = AVMEDIA_TYPE_VIDEO,
82  .get_video_buffer = ff_null_get_video_buffer,
83  .filter_frame = filter_frame,
84  },
85  { NULL }
86 };
87 
89  {
90  .name = "default",
91  .type = AVMEDIA_TYPE_VIDEO
92  },
93  { NULL }
94 };
95 
97  .name = "showinfo",
98  .description = NULL_IF_CONFIG_SMALL("Show textual information for each video frame."),
99 
100  .inputs = avfilter_vf_showinfo_inputs,
101 
102  .outputs = avfilter_vf_showinfo_outputs,
103 };