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/pixdesc.h"
28 #include "avfilter.h"
29 
30 typedef struct {
31  unsigned int frame;
33 
34 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
35 {
36  ShowInfoContext *showinfo = ctx->priv;
37  showinfo->frame = 0;
38  return 0;
39 }
40 
41 static void end_frame(AVFilterLink *inlink)
42 {
43  AVFilterContext *ctx = inlink->dst;
44  ShowInfoContext *showinfo = ctx->priv;
45  AVFilterBufferRef *picref = inlink->cur_buf;
46  uint32_t plane_checksum[4] = {0}, checksum = 0;
47  int i, plane, vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
48 
49  for (plane = 0; picref->data[plane] && plane < 4; plane++) {
50  size_t linesize = av_image_get_linesize(picref->format, picref->video->w, plane);
51  uint8_t *data = picref->data[plane];
52  int h = plane == 1 || plane == 2 ? inlink->h >> vsub : inlink->h;
53 
54  for (i = 0; i < h; i++) {
55  plane_checksum[plane] = av_adler32_update(plane_checksum[plane], data, linesize);
56  checksum = av_adler32_update(checksum, data, linesize);
57  data += picref->linesize[plane];
58  }
59  }
60 
61  av_log(ctx, AV_LOG_INFO,
62  "n:%d pts:%"PRId64" pts_time:%f pos:%"PRId64" "
63  "fmt:%s sar:%d/%d s:%dx%d i:%c iskey:%d type:%c "
64  "checksum:%u plane_checksum:[%u %u %u %u]\n",
65  showinfo->frame,
66  picref->pts, picref->pts * av_q2d(inlink->time_base), picref->pos,
68  picref->video->pixel_aspect.num, picref->video->pixel_aspect.den,
69  picref->video->w, picref->video->h,
70  !picref->video->interlaced ? 'P' : /* Progressive */
71  picref->video->top_field_first ? 'T' : 'B', /* Top / Bottom */
72  picref->video->key_frame,
74  checksum, plane_checksum[0], plane_checksum[1], plane_checksum[2], plane_checksum[3]);
75 
76  showinfo->frame++;
77  avfilter_end_frame(inlink->dst->outputs[0]);
78 }
79 
81  .name = "showinfo",
82  .description = NULL_IF_CONFIG_SMALL("Show textual information for each video frame."),
83 
84  .priv_size = sizeof(ShowInfoContext),
85  .init = init,
86 
87  .inputs = (AVFilterPad[]) {{ .name = "default",
88  .type = AVMEDIA_TYPE_VIDEO,
89  .get_video_buffer = avfilter_null_get_video_buffer,
90  .start_frame = avfilter_null_start_frame,
91  .end_frame = end_frame,
92  .min_perms = AV_PERM_READ, },
93  { .name = NULL}},
94 
95  .outputs = (AVFilterPad[]) {{ .name = "default",
96  .type = AVMEDIA_TYPE_VIDEO },
97  { .name = NULL}},
98 };