mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
130 lines
4.4 KiB
C
130 lines
4.4 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 FFmpeg.
|
|
*
|
|
* FFmpeg 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.
|
|
*
|
|
* FFmpeg 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 FFmpeg; 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 "avfilter.h"
|
|
|
|
typedef struct {
|
|
unsigned int bamount; ///< black amount
|
|
unsigned 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 PixelFormat pix_fmts[] = {
|
|
PIX_FMT_YUV410P, PIX_FMT_YUV420P, PIX_FMT_GRAY8, PIX_FMT_NV12,
|
|
PIX_FMT_NV21, PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV411P,
|
|
PIX_FMT_NONE
|
|
};
|
|
|
|
avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
|
|
{
|
|
BlackFrameContext *blackframe = ctx->priv;
|
|
|
|
blackframe->bamount = 98;
|
|
blackframe->bthresh = 32;
|
|
blackframe->nblack = 0;
|
|
blackframe->frame = 0;
|
|
|
|
if (args)
|
|
sscanf(args, "%u:%u", &blackframe->bamount, &blackframe->bthresh);
|
|
|
|
av_log(ctx, AV_LOG_INFO, "bamount:%u bthresh:%u\n",
|
|
blackframe->bamount, blackframe->bthresh);
|
|
|
|
if (blackframe->bamount > 100 || blackframe->bthresh > 255) {
|
|
av_log(ctx, AV_LOG_ERROR, "Too big value for bamount (max is 100) or bthresh (max is 255)\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
|
|
{
|
|
AVFilterContext *ctx = inlink->dst;
|
|
BlackFrameContext *blackframe = ctx->priv;
|
|
AVFilterBufferRef *picref = inlink->cur_buf;
|
|
int x, i;
|
|
uint8_t *p = picref->data[0] + y * picref->linesize[0];
|
|
|
|
for (i = 0; i < h; i++) {
|
|
for (x = 0; x < inlink->w; x++)
|
|
blackframe->nblack += p[x] < blackframe->bthresh;
|
|
p += picref->linesize[0];
|
|
}
|
|
|
|
avfilter_draw_slice(ctx->outputs[0], y, h, slice_dir);
|
|
}
|
|
|
|
static void end_frame(AVFilterLink *inlink)
|
|
{
|
|
AVFilterContext *ctx = inlink->dst;
|
|
BlackFrameContext *blackframe = ctx->priv;
|
|
AVFilterBufferRef *picref = inlink->cur_buf;
|
|
int pblack = 0;
|
|
|
|
pblack = blackframe->nblack * 100 / (inlink->w * inlink->h);
|
|
if (pblack >= blackframe->bamount)
|
|
av_log(ctx, AV_LOG_INFO, "frame:%u pblack:%u pos:%"PRId64" pts:%"PRId64" t:%f\n",
|
|
blackframe->frame, pblack, picref->pos, picref->pts,
|
|
picref->pts == AV_NOPTS_VALUE ? -1 : picref->pts * av_q2d(inlink->time_base));
|
|
|
|
blackframe->frame++;
|
|
blackframe->nblack = 0;
|
|
avfilter_end_frame(inlink->dst->outputs[0]);
|
|
}
|
|
|
|
AVFilter avfilter_vf_blackframe = {
|
|
.name = "blackframe",
|
|
.description = NULL_IF_CONFIG_SMALL("Detect frames that are (almost) black."),
|
|
|
|
.priv_size = sizeof(BlackFrameContext),
|
|
.init = init,
|
|
|
|
.query_formats = query_formats,
|
|
|
|
.inputs = (AVFilterPad[]) {{ .name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.draw_slice = draw_slice,
|
|
.get_video_buffer = avfilter_null_get_video_buffer,
|
|
.start_frame = avfilter_null_start_frame,
|
|
.end_frame = end_frame, },
|
|
{ .name = NULL}},
|
|
|
|
.outputs = (AVFilterPad[]) {{ .name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO },
|
|
{ .name = NULL}},
|
|
};
|