2 * Copyright (c) 2011 Stefano Sabatini
3 * This file is part of FFmpeg.
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.
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.
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
22 * filter for showing textual video frame information
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"
38 static av_cold int init(AVFilterContext *ctx, const char *args)
40 ShowInfoContext *showinfo = ctx->priv;
45 static int end_frame(AVFilterLink *inlink)
47 AVFilterContext *ctx = inlink->dst;
48 ShowInfoContext *showinfo = ctx->priv;
49 AVFilterBufferRef *picref = inlink->cur_buf;
50 uint32_t plane_checksum[4] = {0}, checksum = 0;
51 int i, plane, vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
53 for (plane = 0; picref->data[plane] && plane < 4; plane++) {
54 size_t linesize = av_image_get_linesize(picref->format, picref->video->w, plane);
55 uint8_t *data = picref->data[plane];
56 int h = plane == 1 || plane == 2 ? inlink->h >> vsub : inlink->h;
58 for (i = 0; i < h; i++) {
59 plane_checksum[plane] = av_adler32_update(plane_checksum[plane], data, linesize);
60 checksum = av_adler32_update(checksum, data, linesize);
61 data += picref->linesize[plane];
65 av_log(ctx, AV_LOG_INFO,
66 "n:%d pts:%s pts_time:%s pos:%"PRId64" "
67 "fmt:%s sar:%d/%d s:%dx%d i:%c iskey:%d type:%c "
68 "checksum:%08X plane_checksum:[%08X",
70 av_ts2str(picref->pts), av_ts2timestr(picref->pts, &inlink->time_base), picref->pos,
71 av_pix_fmt_descriptors[picref->format].name,
72 picref->video->sample_aspect_ratio.num, picref->video->sample_aspect_ratio.den,
73 picref->video->w, picref->video->h,
74 !picref->video->interlaced ? 'P' : /* Progressive */
75 picref->video->top_field_first ? 'T' : 'B', /* Top / Bottom */
76 picref->video->key_frame,
77 av_get_picture_type_char(picref->video->pict_type),
78 checksum, plane_checksum[0]);
80 for (plane = 1; picref->data[plane] && plane < 4; plane++)
81 av_log(ctx, AV_LOG_INFO, " %08X", plane_checksum[plane]);
82 av_log(ctx, AV_LOG_INFO, "]\n");
85 return ff_end_frame(inlink->dst->outputs[0]);
88 AVFilter avfilter_vf_showinfo = {
90 .description = NULL_IF_CONFIG_SMALL("Show textual information for each video frame."),
92 .priv_size = sizeof(ShowInfoContext),
95 .inputs = (const AVFilterPad[]) {{ .name = "default",
96 .type = AVMEDIA_TYPE_VIDEO,
97 .get_video_buffer = ff_null_get_video_buffer,
98 .start_frame = ff_null_start_frame,
99 .end_frame = end_frame,
100 .min_perms = AV_PERM_READ, },
103 .outputs = (const AVFilterPad[]) {{ .name = "default",
104 .type = AVMEDIA_TYPE_VIDEO },