libavfilter/vf_showinfo.c

   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
  20 /**
  21  * @file
  22  * filter for showing textual video frame information
  23  */
  24
  25 #include "libavutil/adler32.h"
  26 #include "libavutil/imgutils.h"
  27 #include "libavutil/internal.h"
  28 #include "libavutil/pixdesc.h"
  29 #include "avfilter.h"
  30 #include "internal.h"
  31 #include "video.h"
  32
  33 typedef struct {
  34     unsigned int frame;
  35 } ShowInfoContext;
  36
  37 static av_cold int init(AVFilterContext *ctx, const char *args)
  38 {
  39     ShowInfoContext *showinfo = ctx->priv;
  40     showinfo->frame = 0;
  41     return 0;
  42 }
  43
  44 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
  45 {
  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;
  51
  52     for (plane = 0; frame->data[plane] && plane < 4; plane++) {
  53         size_t linesize = av_image_get_linesize(frame->format, frame->width, plane);
  54         uint8_t *data = frame->data[plane];
  55         int h = plane == 1 || plane == 2 ? inlink->h >> vsub : inlink->h;
  56
  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];
  61         }
  62     }
  63
  64     av_log(ctx, AV_LOG_INFO,
  65            "n:%d pts:%"PRId64" pts_time:%f "
  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",
  68            showinfo->frame,
  69            frame->pts, frame->pts * av_q2d(inlink->time_base),
  70            desc->name,
  71            frame->sample_aspect_ratio.num, frame->sample_aspect_ratio.den,
  72            frame->width, frame->height,
  73            !frame->interlaced_frame ? 'P' :         /* Progressive  */
  74            frame->top_field_first   ? 'T' : 'B',    /* Top / Bottom */
  75            frame->key_frame,
  76            av_get_picture_type_char(frame->pict_type),
  77            checksum, plane_checksum[0], plane_checksum[1], plane_checksum[2], plane_checksum[3]);
  78
  79     showinfo->frame++;
  80     return ff_filter_frame(inlink->dst->outputs[0], frame);
  81 }
  82
  83 static const AVFilterPad avfilter_vf_showinfo_inputs[] = {
  84     {
  85         .name             = "default",
  86         .type             = AVMEDIA_TYPE_VIDEO,
  87         .get_video_buffer = ff_null_get_video_buffer,
  88         .filter_frame     = filter_frame,
  89     },
  90     { NULL }
  91 };
  92
  93 static const AVFilterPad avfilter_vf_showinfo_outputs[] = {
  94     {
  95         .name = "default",
  96         .type = AVMEDIA_TYPE_VIDEO
  97     },
  98     { NULL }
  99 };
 100
 101 AVFilter avfilter_vf_showinfo = {
 102     .name        = "showinfo",
 103     .description = NULL_IF_CONFIG_SMALL("Show textual information for each video frame."),
 104
 105     .priv_size = sizeof(ShowInfoContext),
 106     .init      = init,
 107
 108     .inputs    = avfilter_vf_showinfo_inputs,
 109
 110     .outputs   = avfilter_vf_showinfo_outputs,
 111 };