2 * Copyright (c) 2011 Stefano Sabatini
3 * This file is part of Libav.
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.
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.
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
22 * filter for showing textual video frame information
25 #include "libavutil/adler32.h"
26 #include "libavutil/imgutils.h"
27 #include "libavutil/pixdesc.h"
36 static av_cold int init(AVFilterContext *ctx, const char *args)
38 ShowInfoContext *showinfo = ctx->priv;
43 static int end_frame(AVFilterLink *inlink)
45 AVFilterContext *ctx = inlink->dst;
46 ShowInfoContext *showinfo = ctx->priv;
47 AVFilterBufferRef *picref = inlink->cur_buf;
48 uint32_t plane_checksum[4] = {0}, checksum = 0;
49 int i, plane, vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
51 for (plane = 0; picref->data[plane] && plane < 4; plane++) {
52 size_t linesize = av_image_get_linesize(picref->format, picref->video->w, plane);
53 uint8_t *data = picref->data[plane];
54 int h = plane == 1 || plane == 2 ? inlink->h >> vsub : inlink->h;
56 for (i = 0; i < h; i++) {
57 plane_checksum[plane] = av_adler32_update(plane_checksum[plane], data, linesize);
58 checksum = av_adler32_update(checksum, data, linesize);
59 data += picref->linesize[plane];
63 av_log(ctx, AV_LOG_INFO,
64 "n:%d pts:%"PRId64" pts_time:%f pos:%"PRId64" "
65 "fmt:%s sar:%d/%d s:%dx%d i:%c iskey:%d type:%c "
66 "checksum:%u plane_checksum:[%u %u %u %u]\n",
68 picref->pts, picref->pts * av_q2d(inlink->time_base), picref->pos,
69 av_pix_fmt_descriptors[picref->format].name,
70 picref->video->pixel_aspect.num, picref->video->pixel_aspect.den,
71 picref->video->w, picref->video->h,
72 !picref->video->interlaced ? 'P' : /* Progressive */
73 picref->video->top_field_first ? 'T' : 'B', /* Top / Bottom */
74 picref->video->key_frame,
75 av_get_picture_type_char(picref->video->pict_type),
76 checksum, plane_checksum[0], plane_checksum[1], plane_checksum[2], plane_checksum[3]);
79 return ff_end_frame(inlink->dst->outputs[0]);
82 AVFilter avfilter_vf_showinfo = {
84 .description = NULL_IF_CONFIG_SMALL("Show textual information for each video frame."),
86 .priv_size = sizeof(ShowInfoContext),
89 .inputs = (const AVFilterPad[]) {{ .name = "default",
90 .type = AVMEDIA_TYPE_VIDEO,
91 .get_video_buffer = ff_null_get_video_buffer,
92 .start_frame = ff_null_start_frame,
93 .end_frame = end_frame,
94 .min_perms = AV_PERM_READ, },
97 .outputs = (const AVFilterPad[]) {{ .name = "default",
98 .type = AVMEDIA_TYPE_VIDEO },