mirror of
https://github.com/nyanmisaka/ffmpeg-rockchip.git
synced 2025-10-31 12:36:41 +08:00
134 lines
4.1 KiB
C
134 lines
4.1 KiB
C
/*
|
|
* Copyright (c) 2010 Stefano Sabatini
|
|
* Copyright (c) 2006 Ivo van Poorten
|
|
* Copyright (c) 2006 Julian Hall
|
|
* Copyright (c) 2002-2003 Brian J. Murrell
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* Libav is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with Libav; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* Search for black frames to detect scene transitions.
|
|
* Ported from MPlayer libmpcodecs/vf_blackframe.c.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <inttypes.h>
|
|
|
|
#include "libavutil/internal.h"
|
|
#include "libavutil/opt.h"
|
|
|
|
#include "avfilter.h"
|
|
#include "formats.h"
|
|
#include "internal.h"
|
|
#include "video.h"
|
|
|
|
typedef struct BlackFrameContext {
|
|
const AVClass *class;
|
|
int bamount; ///< black amount
|
|
int bthresh; ///< black threshold
|
|
unsigned int frame; ///< frame number
|
|
unsigned int nblack; ///< number of black pixels counted so far
|
|
} BlackFrameContext;
|
|
|
|
static int query_formats(AVFilterContext *ctx)
|
|
{
|
|
static const enum AVPixelFormat pix_fmts[] = {
|
|
AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NV12,
|
|
AV_PIX_FMT_NV21, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV411P,
|
|
AV_PIX_FMT_NONE
|
|
};
|
|
|
|
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
|
|
return 0;
|
|
}
|
|
|
|
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
|
|
{
|
|
AVFilterContext *ctx = inlink->dst;
|
|
BlackFrameContext *s = ctx->priv;
|
|
int x, i;
|
|
int pblack = 0;
|
|
uint8_t *p = frame->data[0];
|
|
|
|
for (i = 0; i < frame->height; i++) {
|
|
for (x = 0; x < inlink->w; x++)
|
|
s->nblack += p[x] < s->bthresh;
|
|
p += frame->linesize[0];
|
|
}
|
|
|
|
pblack = s->nblack * 100 / (inlink->w * inlink->h);
|
|
if (pblack >= s->bamount)
|
|
av_log(ctx, AV_LOG_INFO, "frame:%u pblack:%u pts:%"PRId64" t:%f\n",
|
|
s->frame, pblack, frame->pts,
|
|
frame->pts == AV_NOPTS_VALUE ? -1 : frame->pts * av_q2d(inlink->time_base));
|
|
|
|
s->frame++;
|
|
s->nblack = 0;
|
|
return ff_filter_frame(inlink->dst->outputs[0], frame);
|
|
}
|
|
|
|
#define OFFSET(x) offsetof(BlackFrameContext, x)
|
|
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
|
|
static const AVOption options[] = {
|
|
{ "amount", "Percentage of the pixels that have to be below the threshold "
|
|
"for the frame to be considered black.", OFFSET(bamount), AV_OPT_TYPE_INT, { .i64 = 98 }, 0, 100, FLAGS },
|
|
{ "threshold", "threshold below which a pixel value is considered black",
|
|
OFFSET(bthresh), AV_OPT_TYPE_INT, { .i64 = 32 }, 0, INT_MAX, FLAGS },
|
|
{ NULL },
|
|
};
|
|
|
|
static const AVClass blackframe_class = {
|
|
.class_name = "blackframe",
|
|
.item_name = av_default_item_name,
|
|
.option = options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
static const AVFilterPad avfilter_vf_blackframe_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.get_video_buffer = ff_null_get_video_buffer,
|
|
.filter_frame = filter_frame,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad avfilter_vf_blackframe_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFilter ff_vf_blackframe = {
|
|
.name = "blackframe",
|
|
.description = NULL_IF_CONFIG_SMALL("Detect frames that are (almost) black."),
|
|
|
|
.priv_size = sizeof(BlackFrameContext),
|
|
.priv_class = &blackframe_class,
|
|
|
|
.query_formats = query_formats,
|
|
|
|
.inputs = avfilter_vf_blackframe_inputs,
|
|
|
|
.outputs = avfilter_vf_blackframe_outputs,
|
|
};
|