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/internal.h"
28 #include "libavutil/pixdesc.h"
37 static av_cold
int init(AVFilterContext
*ctx
, const char *args
)
39 ShowInfoContext
*showinfo
= ctx
->priv
;
44 static int filter_frame(AVFilterLink
*inlink
, AVFilterBufferRef
*frame
)
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
;
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
;
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
];
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",
69 frame
->pts
, frame
->pts
* av_q2d(inlink
->time_base
), frame
->pos
,
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
,
76 av_get_picture_type_char(frame
->video
->pict_type
),
77 checksum
, plane_checksum
[0], plane_checksum
[1], plane_checksum
[2], plane_checksum
[3]);
80 return ff_filter_frame(inlink
->dst
->outputs
[0], frame
);
83 static const AVFilterPad avfilter_vf_showinfo_inputs
[] = {
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
,
94 static const AVFilterPad avfilter_vf_showinfo_outputs
[] = {
97 .type
= AVMEDIA_TYPE_VIDEO
102 AVFilter avfilter_vf_showinfo
= {
104 .description
= NULL_IF_CONFIG_SMALL("Show textual information for each video frame."),
106 .priv_size
= sizeof(ShowInfoContext
),
109 .inputs
= avfilter_vf_showinfo_inputs
,
111 .outputs
= avfilter_vf_showinfo_outputs
,