vf_showinfo.c
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1 /*
2  * Copyright (c) 2011 Stefano Sabatini
3  * This file is part of Libav.
4  *
5  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18  */
19 
25 #include "libavutil/adler32.h"
26 #include "libavutil/imgutils.h"
27 #include "libavutil/internal.h"
28 #include "libavutil/pixdesc.h"
29 #include "avfilter.h"
30 #include "internal.h"
31 #include "video.h"
32 
33 typedef struct {
34  unsigned int frame;
36 
37 static av_cold int init(AVFilterContext *ctx, const char *args)
38 {
39  ShowInfoContext *showinfo = ctx->priv;
40  showinfo->frame = 0;
41  return 0;
42 }
43 
44 static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *frame)
45 {
46  AVFilterContext *ctx = inlink->dst;
47  ShowInfoContext *showinfo = ctx->priv;
48  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
49  uint32_t plane_checksum[4] = {0}, checksum = 0;
50  int i, plane, vsub = desc->log2_chroma_h;
51 
52  for (plane = 0; frame->data[plane] && plane < 4; plane++) {
53  size_t linesize = av_image_get_linesize(frame->format, frame->video->w, plane);
54  uint8_t *data = frame->data[plane];
55  int h = plane == 1 || plane == 2 ? inlink->h >> vsub : inlink->h;
56 
57  for (i = 0; i < h; i++) {
58  plane_checksum[plane] = av_adler32_update(plane_checksum[plane], data, linesize);
59  checksum = av_adler32_update(checksum, data, linesize);
60  data += frame->linesize[plane];
61  }
62  }
63 
64  av_log(ctx, AV_LOG_INFO,
65  "n:%d pts:%"PRId64" pts_time:%f pos:%"PRId64" "
66  "fmt:%s sar:%d/%d s:%dx%d i:%c iskey:%d type:%c "
67  "checksum:%u plane_checksum:[%u %u %u %u]\n",
68  showinfo->frame,
69  frame->pts, frame->pts * av_q2d(inlink->time_base), frame->pos,
70  desc->name,
71  frame->video->pixel_aspect.num, frame->video->pixel_aspect.den,
72  frame->video->w, frame->video->h,
73  !frame->video->interlaced ? 'P' : /* Progressive */
74  frame->video->top_field_first ? 'T' : 'B', /* Top / Bottom */
75  frame->video->key_frame,
77  checksum, plane_checksum[0], plane_checksum[1], plane_checksum[2], plane_checksum[3]);
78 
79  showinfo->frame++;
80  return ff_filter_frame(inlink->dst->outputs[0], frame);
81 }
82 
84  {
85  .name = "default",
86  .type = AVMEDIA_TYPE_VIDEO,
87  .get_video_buffer = ff_null_get_video_buffer,
88  .filter_frame = filter_frame,
89  .min_perms = AV_PERM_READ,
90  },
91  { NULL }
92 };
93 
95  {
96  .name = "default",
97  .type = AVMEDIA_TYPE_VIDEO
98  },
99  { NULL }
100 };
101 
103  .name = "showinfo",
104  .description = NULL_IF_CONFIG_SMALL("Show textual information for each video frame."),
105 
106  .priv_size = sizeof(ShowInfoContext),
107  .init = init,
108 
109  .inputs = avfilter_vf_showinfo_inputs,
110 
111  .outputs = avfilter_vf_showinfo_outputs,
112 };