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ffmpeg / libavfilter / vf_showinfo.c @ bb82ea79

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/*
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 * Copyright (c) 2011 Stefano Sabatini
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file
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 * filter fow showing textual video frame information
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 */
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#include "libavutil/adler32.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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typedef struct {
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    unsigned int frame;
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} ShowInfoContext;
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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    ShowInfoContext *showinfo = ctx->priv;
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    showinfo->frame = 0;
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    return 0;
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}
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static void end_frame(AVFilterLink *inlink)
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{
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    AVFilterContext *ctx = inlink->dst;
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    ShowInfoContext *showinfo = ctx->priv;
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    AVFilterBufferRef *picref = inlink->cur_buf;
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    uint32_t plane_crc[4] = {0}, crc = 0;
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    int i, plane, vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
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    for (plane = 0; picref->data[plane] && plane < 4; plane++) {
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        size_t linesize = av_image_get_linesize(picref->format, picref->video->w, plane);
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        uint8_t *data = picref->data[plane];
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        int h = plane == 1 || plane == 2 ? inlink->h >> vsub : inlink->h;
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        for (i = 0; i < h; i++) {
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            plane_crc[plane] = av_adler32_update(plane_crc[plane], data, linesize);
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            crc = av_adler32_update(crc, data, linesize);
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            data += picref->linesize[plane];
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        }
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    }
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    av_log(ctx, AV_LOG_INFO,
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           "n:%d pts:%"PRId64" pts_time:%f pos:%"PRId64" "
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           "fmt:%s sar:%d/%d s:%dx%d i:%c iskey:%d type:%c "
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           "crc:%u plane_crc:[%u %u %u %u]\n",
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           showinfo->frame,
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           picref->pts, picref ->pts * av_q2d(inlink->time_base), picref->pos,
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           av_pix_fmt_descriptors[picref->format].name,
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           picref->video->sample_aspect_ratio.num, picref->video->sample_aspect_ratio.den,
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           picref->video->w, picref->video->h,
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           !picref->video->interlaced     ? 'P' :         /* Progressive  */
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           picref->video->top_field_first ? 'T' : 'B',    /* Top / Bottom */
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           picref->video->key_frame,
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           av_get_picture_type_char(picref->video->pict_type),
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           crc, plane_crc[0], plane_crc[1], plane_crc[2], plane_crc[3]);
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    showinfo->frame++;
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    avfilter_end_frame(inlink->dst->outputs[0]);
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}
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AVFilter avfilter_vf_showinfo = {
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    .name        = "showinfo",
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    .description = NULL_IF_CONFIG_SMALL("Show textual information for each video frame."),
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    .priv_size = sizeof(ShowInfoContext),
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    .init      = init,
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    .inputs    = (AVFilterPad[]) {{ .name = "default",
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                                    .type             = AVMEDIA_TYPE_VIDEO,
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                                    .get_video_buffer = avfilter_null_get_video_buffer,
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                                    .start_frame      = avfilter_null_start_frame,
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                                    .end_frame        = end_frame,
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                                    .min_perms       = AV_PERM_READ, },
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                                  { .name = NULL}},
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    .outputs   = (AVFilterPad[]) {{ .name             = "default",
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                                    .type             = AVMEDIA_TYPE_VIDEO },
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                                  { .name = NULL}},
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};