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new black frame detection filter

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by Brian J. Murrell, Julian Hall and me.



git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@19099 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
ivo 2006-07-15 09:18:44 +00:00
parent ee0a29934a
commit 761c684fc8
6 changed files with 163 additions and 0 deletions
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7
AUTHORS
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@ -338,6 +338,9 @@ Guyomarch, Rémi (rguyom) <rguyom@pobox.com>
* unsharp video filter
* XviD encoding support
Hall, Julian <jules@meridiandigital.co.uk>
* black frame detection filter (vf_blackframe)
Hammelmann, Jürgen <juergen.hammelmann@gmx.de>
* TOOLS/mencvcd author
@ -572,6 +575,9 @@ Mohari, András <mayday@varoshaza.nagyatad.hu>
Mueller, Steven <diffusor@ugcs.caltech.edu>
* first implementation of live changing playback speed
Murrel, Brian J. <brian@interlinx.bc.ca>
* black frame detection filter (vf_blackframe)
Neundorf, Alexander <neundorf@kde.org>
* raw DV demuxer
* demuxer packet refcounting
@ -642,6 +648,7 @@ van Poorten, Ivo (ivop) <ivop@euronet.nl>
* vo_pnm video output driver
* vo_md5sum video output driver
* af_ladspa LADSPA plugin loader
* vf_blackframe cleanup and simplification
Ran, Lu <hephooey@fastmail.fm>
* Chinese documentation translation

11
DOCS/man/en/mplayer.1
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@ -6259,6 +6259,17 @@ Moves SSA/ASS subtitle rendering to an arbitrary point in the filter chain.
Only useful with the \-ass option.
.RE
.
.TP
.B blackframe[=amount:threshold]
Detect frames that are (almost) completely black.
Can be useful to detect chapter transitions or commercials.
.RSs
.IPs <amount>
percentage of the pixels that have to be below the threshold (default: 98)
.IPs <threshold>
threshold below which a pixel value is considered black (default: 32)
.RE
.
.
.
.SH "GENERAL ENCODING OPTIONS (MENCODER ONLY)"

1
DOCS/tech/MAINTAINERS
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@ -125,6 +125,7 @@ codec support:
video filters:
* general: Richard Felker, Michael Niedermayer
* vf_filmdint.c - Zoltan Hidvegi
* vf_blackframe.c - Ivo van Poorten
audio filters:
* general: Alex Beregszaszi

1
libmpcodecs/Makefile
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@ -120,6 +120,7 @@ VFILTER_SRCS=vf.c \
pullup.c \
vf_1bpp.c \
vf_2xsai.c \
vf_blackframe.c \
vf_bmovl.c \
vf_boxblur.c \
vf_crop.c \

2
libmpcodecs/vf.c
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@ -103,6 +103,7 @@ extern vf_info_t vf_info_screenshot;
extern vf_info_t vf_info_ass;
extern vf_info_t vf_info_mcdeint;
extern vf_info_t vf_info_yadif;
extern vf_info_t vf_info_blackframe;
// list of available filters:
static vf_info_t* filter_list[]={
@ -199,6 +200,7 @@ static vf_info_t* filter_list[]={
&vf_info_ass,
#endif
&vf_info_yadif,
&vf_info_blackframe,
NULL
};

141
libmpcodecs/vf_blackframe.c Normal file
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@ -0,0 +1,141 @@
/* vf_blackframe.c - detect frames that are (almost) black
*
* $Id$
*
* search for black frames to detect scene transitions
* (c) 2006 Julian Hall
*
* based on code designed for skipping commercials
* (c) 2002-2003 Brian J. Murrell
*
* cleanup, simplify, speedup (c) 2006 by Ivo van Poorten
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include "mp_msg.h"
#include "img_format.h"
#include "mp_image.h"
#include "vf.h"
struct vf_priv_s {
unsigned int bamount, bthresh, frame;
};
static int config(struct vf_instance_s* vf, int width, int height, int d_width,
int d_height, unsigned int flags, unsigned int outfmt) {
return vf_next_config(vf,width,height,d_width,d_height,flags,outfmt);
}
static int query_format(struct vf_instance_s *vf, unsigned fmt) {
switch(fmt) {
case IMGFMT_YVU9:
case IMGFMT_IF09:
case IMGFMT_YV12:
case IMGFMT_I420:
case IMGFMT_IYUV:
case IMGFMT_CLPL:
case IMGFMT_Y800:
case IMGFMT_Y8:
case IMGFMT_NV12:
case IMGFMT_NV21:
case IMGFMT_444P:
case IMGFMT_422P:
case IMGFMT_411P:
case IMGFMT_HM12:
return vf_next_query_format(vf, fmt);
}
return 0;
}
static int put_image(struct vf_instance_s* vf, mp_image_t *mpi, double pts){
mp_image_t *dmpi;
int x, y;
int nblack=0, pblack=0;
unsigned char *yplane = mpi->planes[0];
unsigned int ystride = mpi->stride[0];
int w = mpi->w, h = mpi->h;
int bthresh = vf->priv->bthresh;
int bamount = vf->priv->bamount;
for (y=1; y<=h; y++) {
for (x=0; x<w; x++)
nblack += yplane[x] < bthresh;
pblack = nblack*100/(w*y);
if (pblack < bamount) break;
yplane += ystride;
}
if (pblack >= bamount)
mp_msg(MSGT_VFILTER, MSGL_INFO,"\nBlack frame: frame %u (%2d%%)\n",
vf->priv->frame, pblack);
vf->priv->frame++;
dmpi = vf_get_image(vf->next, mpi->imgfmt, MP_IMGTYPE_EXPORT, 0,
mpi->width, mpi->height);
dmpi->planes[0] = mpi->planes[0];
dmpi->stride[0] = mpi->stride[0];
dmpi->planes[1] = mpi->planes[1];
dmpi->stride[1] = mpi->stride[1];
dmpi->planes[2] = mpi->planes[2];
dmpi->stride[2] = mpi->stride[2];
vf_clone_mpi_attributes(dmpi, mpi);
return vf_next_put_image(vf, dmpi, pts);
}
static int control(struct vf_instance_s* vf, int request, void* data){
return vf_next_control(vf,request,data);
}
static void uninit(struct vf_instance_s *vf) {
if (vf->priv) free(vf->priv);
}
static int open(vf_instance_t *vf, char* args){
vf->priv = malloc(sizeof(struct vf_priv_s));
if (!vf->priv) return 0;
vf->config = config;
vf->put_image = put_image;
vf->control = control;
vf->uninit = uninit;
vf->query_format = query_format;
vf->priv->bamount = 98;
vf->priv->bthresh = 0x20;
vf->priv->frame = 0;
if (args)
sscanf(args, "%u:%u", &vf->priv->bamount, &vf->priv->bthresh);
return 1;
}
vf_info_t vf_info_blackframe = {
"detects black frames",
"blackframe",
"Brian J. Murrell, Julian Hall, Ivo van Poorten",
"Useful for detecting scene transitions",
open,
NULL
};