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Port MPlayer blackframe filter.
See thread: Subject: [FFmpeg-devel] [PATCH] Port MPlayer blackframe filter. Date: Sun, 26 Sep 2010 01:10:40 +0200 Originally committed as revision 25214 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -41,6 +41,7 @@ version <next>:
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- make the crop filter accept parametric expressions
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- make ffprobe accept AVFormatContext options
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- yadif filter
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- blackframe filter
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version 0.6:
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1
configure
vendored
1
configure
vendored
@ -1401,6 +1401,7 @@ tcp_protocol_deps="network"
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udp_protocol_deps="network"
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# filters
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blackframe_filter_deps="gpl"
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ocv_smooth_filter_deps="libopencv"
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yadif_filter_deps="gpl"
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@ -71,6 +71,27 @@ build.
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Below is a description of the currently available video filters.
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@section blackframe
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Detect frames that are (almost) completely black. Can be useful to
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detect chapter transitions or commercials. Output lines consist of
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the frame number of the detected frame, the percentage of blackness,
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the position in the file if known or -1 and the timestamp in seconds.
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In order to display the output lines, you need to set the loglevel at
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least to the AV_LOG_INFO value.
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The filter accepts the syntax:
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@example
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blackframe[=@var{amount}:[@var{threshold}]]
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@end example
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@var{amount} is the percentage of the pixels that have to be below the
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threshold, and defaults to 98.
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@var{threshold} is the threshold below which a pixel value is
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considered black, and defaults to 32.
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@section crop
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Crop the input video to @var{out_w}:@var{out_h}:@var{x}:@var{y}.
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@ -21,6 +21,7 @@ OBJS-$(CONFIG_ANULLSRC_FILTER) += asrc_anullsrc.o
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OBJS-$(CONFIG_ANULLSINK_FILTER) += asink_anullsink.o
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OBJS-$(CONFIG_ASPECT_FILTER) += vf_aspect.o
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OBJS-$(CONFIG_BLACKFRAME_FILTER) += vf_blackframe.o
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OBJS-$(CONFIG_CROP_FILTER) += vf_crop.o
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OBJS-$(CONFIG_FIFO_FILTER) += vf_fifo.o
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OBJS-$(CONFIG_FORMAT_FILTER) += vf_format.o
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@ -41,6 +41,7 @@ void avfilter_register_all(void)
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REGISTER_FILTER (ANULLSINK, anullsink, asink);
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REGISTER_FILTER (ASPECT, aspect, vf);
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REGISTER_FILTER (BLACKFRAME, blackframe, vf);
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REGISTER_FILTER (CROP, crop, vf);
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REGISTER_FILTER (FIFO, fifo, vf);
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REGISTER_FILTER (FORMAT, format, vf);
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@ -25,7 +25,7 @@
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#include "libavutil/avutil.h"
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#define LIBAVFILTER_VERSION_MAJOR 1
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#define LIBAVFILTER_VERSION_MINOR 45
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#define LIBAVFILTER_VERSION_MINOR 46
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#define LIBAVFILTER_VERSION_MICRO 0
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#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
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129
libavfilter/vf_blackframe.c
Normal file
129
libavfilter/vf_blackframe.c
Normal file
@ -0,0 +1,129 @@
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/*
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* Copyright (C) 2010 Stefano Sabatini
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* Copyright (C) 2006 Ivo van Poorten
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* Copyright (C) 2006 Julian Hall
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* Copyright (C) 2002-2003 Brian J. Murrell
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*
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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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 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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* Search for black frames to detect scene transitions.
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* Ported from MPlayer libmpcodecs/vf_blackframe.c.
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*/
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#include "avfilter.h"
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typedef struct {
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unsigned int bamount; ///< black amount
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unsigned int bthresh; ///< black threshold
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unsigned int frame; ///< frame number
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unsigned int nblack; ///< number of black pixels counted so far
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} BlackFrameContext;
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum PixelFormat pix_fmts[] = {
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PIX_FMT_YUV410P, PIX_FMT_YUV420P, PIX_FMT_GRAY8, PIX_FMT_NV12,
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PIX_FMT_NV21, PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV411P,
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PIX_FMT_NONE
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};
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avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
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return 0;
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}
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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BlackFrameContext *blackframe = ctx->priv;
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blackframe->bamount = 98;
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blackframe->bthresh = 32;
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blackframe->nblack = 0;
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blackframe->frame = 0;
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if (args)
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sscanf(args, "%u:%u", &blackframe->bamount, &blackframe->bthresh);
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av_log(ctx, AV_LOG_INFO, "bamount:%u bthresh:%u\n",
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blackframe->bamount, blackframe->bthresh);
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if (blackframe->bamount > 100 || blackframe->bthresh > 255) {
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av_log(ctx, AV_LOG_ERROR, "Too big value for bamount (max is 100) or bthresh (max is 255)\n");
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return AVERROR(EINVAL);
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}
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return 0;
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}
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static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
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{
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AVFilterContext *ctx = inlink->dst;
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BlackFrameContext *blackframe = ctx->priv;
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AVFilterBufferRef *picref = inlink->cur_buf;
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int x, i;
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uint8_t *p = picref->data[0] + y * picref->linesize[0];
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for (i = 0; i < h; i++) {
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for (x = 0; x < inlink->w; x++)
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blackframe->nblack += p[x] < blackframe->bthresh;
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p += picref->linesize[0];
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}
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avfilter_draw_slice(ctx->outputs[0], y, h, slice_dir);
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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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BlackFrameContext *blackframe = ctx->priv;
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AVFilterBufferRef *picref = inlink->cur_buf;
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int pblack = 0;
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pblack = blackframe->nblack * 100 / (inlink->w * inlink->h);
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if (pblack >= blackframe->bamount)
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av_log(ctx, AV_LOG_INFO, "frame:%u pblack:%u pos:%"PRId64" pts:%f\n",
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blackframe->frame, pblack, picref->pos,
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picref->pts == AV_NOPTS_VALUE ? -1 : (double)picref->pts / AV_TIME_BASE);
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blackframe->frame++;
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blackframe->nblack = 0;
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avfilter_end_frame(inlink->dst->outputs[0]);
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}
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AVFilter avfilter_vf_blackframe = {
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.name = "blackframe",
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.description = NULL_IF_CONFIG_SMALL("Detect frames that are (almost) black."),
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.priv_size = sizeof(BlackFrameContext),
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.init = init,
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.query_formats = query_formats,
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.inputs = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.draw_slice = draw_slice,
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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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{ .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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};
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