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 filter_frame(AVFilterLink *inlink, AVFilterBufferRef *frame)
47 AVFilterContext *ctx = inlink->dst;
48 ShowInfoContext *showinfo = ctx->priv;
49 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
50 uint32_t plane_checksum[4] = {0}, checksum = 0;
51 int i, plane, vsub = desc->log2_chroma_h;
53 for (plane = 0; plane < 4 && frame->data[plane]; plane++) {
54 int64_t linesize = av_image_get_linesize(frame->format, frame->video->w, plane);
55 uint8_t *data = frame->data[plane];
56 int h = plane == 1 || plane == 2 ? inlink->h >> vsub : inlink->h;
61 for (i = 0; i < h; i++) {
62 plane_checksum[plane] = av_adler32_update(plane_checksum[plane], data, linesize);
63 checksum = av_adler32_update(checksum, data, linesize);
64 data += frame->linesize[plane];
68 av_log(ctx, AV_LOG_INFO,
69 "n:%d pts:%s pts_time:%s pos:%"PRId64" "
70 "fmt:%s sar:%d/%d s:%dx%d i:%c iskey:%d type:%c "
71 "checksum:%08X plane_checksum:[%08X",
73 av_ts2str(frame->pts), av_ts2timestr(frame->pts, &inlink->time_base), frame->pos,
75 frame->video->sample_aspect_ratio.num, frame->video->sample_aspect_ratio.den,
76 frame->video->w, frame->video->h,
77 !frame->video->interlaced ? 'P' : /* Progressive */
78 frame->video->top_field_first ? 'T' : 'B', /* Top / Bottom */
79 frame->video->key_frame,
80 av_get_picture_type_char(frame->video->pict_type),
81 checksum, plane_checksum[0]);
83 for (plane = 1; plane < 4 && frame->data[plane]; plane++)
84 av_log(ctx, AV_LOG_INFO, " %08X", plane_checksum[plane]);
85 av_log(ctx, AV_LOG_INFO, "]\n");
88 return ff_filter_frame(inlink->dst->outputs[0], frame);
91 static const AVFilterPad avfilter_vf_showinfo_inputs[] = {
94 .type = AVMEDIA_TYPE_VIDEO,
95 .get_video_buffer = ff_null_get_video_buffer,
96 .filter_frame = filter_frame,
97 .min_perms = AV_PERM_READ,
102 static const AVFilterPad avfilter_vf_showinfo_outputs[] = {
105 .type = AVMEDIA_TYPE_VIDEO
110 AVFilter avfilter_vf_showinfo = {
112 .description = NULL_IF_CONFIG_SMALL("Show textual information for each video frame."),
114 .priv_size = sizeof(ShowInfoContext),
117 .inputs = avfilter_vf_showinfo_inputs,
119 .outputs = avfilter_vf_showinfo_outputs,