Commit 68b79bfc authored by Stefano Sabatini's avatar Stefano Sabatini

Implement cropdetect filter.

Originally committed as revision 25447 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent 16134b7c
......@@ -45,6 +45,7 @@ version <next>:
- Demuxer for Leitch/Harris' VR native stream format (LXF)
- RTP depacketization of the X-QT QuickTime format
- SAP (Session Announcement Protocol, RFC 2974) muxer
- cropdetect filter
version 0.6:
......
......@@ -1399,6 +1399,7 @@ udp_protocol_deps="network"
# filters
blackframe_filter_deps="gpl"
cropdetect_filter_deps="gpl"
frei0r_filter_deps="frei0r dlopen strtok_r"
ocv_smooth_filter_deps="libopencv"
yadif_filter_deps="gpl"
......
......@@ -190,6 +190,41 @@ crop=in_w-100:in_h-100:100:100
"crop=in_w/2:in_h/2:y:10+10*sin(n/10)"
@end example
@section cropdetect
Auto-detect crop size.
Calculate necessary cropping parameters and prints the recommended
parameters through the logging system. The detected dimensions
correspond to the non-black area of the input video.
It accepts the syntax:
@example
cropdetect[=@var{limit}:@var{round}[:@var{reset}]]
@end example
@table @option
@item limit
Threshold, which can be optionally specified from nothing (0) to
everything (255), defaults to 24.
@item round
Value which the width/height should be divisible by, defaults to
16. The offset is automatically adjusted to center the video. Use 2 to
get only even dimensions (needed for 4:2:2 video). 16 is best when
encoding to most video codecs.
@item reset
Counter that determines after how many frames cropdetect will reset
the previously detected largest video area and start over to detect
the current optimal crop area. Defaults to 0.
This can be useful when channel logos distort the video area. 0
indicates never reset and return the largest area encountered during
playback.
@end table
@section drawbox
Draw a colored box on the input image.
......
......@@ -23,6 +23,7 @@ OBJS-$(CONFIG_ANULLSINK_FILTER) += asink_anullsink.o
OBJS-$(CONFIG_ASPECT_FILTER) += vf_aspect.o
OBJS-$(CONFIG_BLACKFRAME_FILTER) += vf_blackframe.o
OBJS-$(CONFIG_CROP_FILTER) += vf_crop.o
OBJS-$(CONFIG_CROPDETECT_FILTER) += vf_cropdetect.o
OBJS-$(CONFIG_DRAWBOX_FILTER) += vf_drawbox.o
OBJS-$(CONFIG_FIFO_FILTER) += vf_fifo.o
OBJS-$(CONFIG_FORMAT_FILTER) += vf_format.o
......
......@@ -43,6 +43,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (ASPECT, aspect, vf);
REGISTER_FILTER (BLACKFRAME, blackframe, vf);
REGISTER_FILTER (CROP, crop, vf);
REGISTER_FILTER (CROPDETECT, cropdetect, vf);
REGISTER_FILTER (DRAWBOX, drawbox, vf);
REGISTER_FILTER (FIFO, fifo, vf);
REGISTER_FILTER (FORMAT, format, vf);
......
......@@ -25,8 +25,8 @@
#include "libavutil/avutil.h"
#define LIBAVFILTER_VERSION_MAJOR 1
#define LIBAVFILTER_VERSION_MINOR 50
#define LIBAVFILTER_VERSION_MICRO 1
#define LIBAVFILTER_VERSION_MINOR 51
#define LIBAVFILTER_VERSION_MICRO 0
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \
......
/*
* Copyright (C) 2002 A'rpi
* 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
* border detection filter
* Ported from MPlayer libmpcodecs/vf_cropdetect.c.
*/
#include "libavcore/imgutils.h"
#include "avfilter.h"
typedef struct {
int x1, y1, x2, y2;
int limit;
int round;
int reset_count;
int frame_nb;
int max_pixsteps[4];
} CropDetectContext;
static int query_formats(AVFilterContext *ctx)
{
static const enum PixelFormat pix_fmts[] = {
PIX_FMT_YUV420P, PIX_FMT_YUVJ420P,
PIX_FMT_YUV422P, PIX_FMT_YUVJ422P,
PIX_FMT_YUV444P, PIX_FMT_YUVJ444P,
PIX_FMT_YUV411P, PIX_FMT_GRAY8,
PIX_FMT_NV12, PIX_FMT_NV21,
PIX_FMT_NONE
};
avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
return 0;
}
static int checkline(void *ctx, const unsigned char *src, int stride, int len, int bpp)
{
int total = 0;
int div = len;
switch (bpp) {
case 1:
while (--len >= 0) {
total += src[0];
src += stride;
}
break;
case 3:
case 4:
while (--len >= 0) {
total += src[0] + src[1] + src[2];
src += stride;
}
div *= 3;
break;
}
total /= div;
av_log(ctx, AV_LOG_DEBUG, "total:%d\n", total);
return total;
}
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
{
CropDetectContext *cd = ctx->priv;
cd->limit = 24;
cd->round = 0;
cd->reset_count = 0;
cd->frame_nb = -2;
if (args)
sscanf(args, "%d:%d:%d", &cd->limit, &cd->round, &cd->reset_count);
av_log(ctx, AV_LOG_INFO, "limit:%d round:%d reset_count:%d\n",
cd->limit, cd->round, cd->reset_count);
return 0;
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
CropDetectContext *cd = ctx->priv;
av_image_fill_max_pixsteps(cd->max_pixsteps, NULL,
&av_pix_fmt_descriptors[inlink->format]);
cd->x1 = inlink->w - 1;
cd->y1 = inlink->h - 1;
cd->x2 = 0;
cd->y2 = 0;
return 0;
}
static void end_frame(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
CropDetectContext *cd = ctx->priv;
AVFilterBufferRef *picref = inlink->cur_buf;
int bpp = cd->max_pixsteps[0];
int w, h, x, y, shrink_by;
// ignore first 2 frames - they may be empty
if (++cd->frame_nb > 0) {
// Reset the crop area every reset_count frames, if reset_count is > 0
if (cd->reset_count > 0 && cd->frame_nb > cd->reset_count) {
cd->x1 = picref->video->w-1;
cd->y1 = picref->video->h-1;
cd->x2 = 0;
cd->y2 = 0;
cd->frame_nb = 1;
}
for (y = 0; y < cd->y1; y++) {
if (checkline(ctx, picref->data[0] + picref->linesize[0] * y, bpp, picref->video->w, bpp) > cd->limit) {
cd->y1 = y;
break;
}
}
for (y = picref->video->h-1; y > cd->y2; y--) {
if (checkline(ctx, picref->data[0] + picref->linesize[0] * y, bpp, picref->video->w, bpp) > cd->limit) {
cd->y2 = y;
break;
}
}
for (y = 0; y < cd->x1; y++) {
if (checkline(ctx, picref->data[0] + bpp*y, picref->linesize[0], picref->video->h, bpp) > cd->limit) {
cd->x1 = y;
break;
}
}
for (y = picref->video->w-1; y > cd->x2; y--) {
if (checkline(ctx, picref->data[0] + bpp*y, picref->linesize[0], picref->video->h, bpp) > cd->limit) {
cd->x2 = y;
break;
}
}
// round x and y (up), important for yuv colorspaces
// make sure they stay rounded!
x = (cd->x1+1) & ~1;
y = (cd->y1+1) & ~1;
w = cd->x2 - x + 1;
h = cd->y2 - y + 1;
// w and h must be divisible by 2 as well because of yuv
// colorspace problems.
if (cd->round <= 1)
cd->round = 16;
if (cd->round % 2)
cd->round *= 2;
shrink_by = w % cd->round;
w -= shrink_by;
x += (shrink_by/2 + 1) & ~1;
shrink_by = h % cd->round;
h -= shrink_by;
y += (shrink_by/2 + 1) & ~1;
av_log(ctx, AV_LOG_INFO,
"x1:%d x2:%d y1:%d y2:%d w:%d h:%d x:%d y:%d pos:%"PRId64" pts:%f crop=%d:%d:%d:%d\n",
cd->x1, cd->x2, cd->y1, cd->y2, w, h, x, y, picref->pos,
picref->pts == AV_NOPTS_VALUE ? -1 : (double)picref->pts / AV_TIME_BASE,
w, h, x, y);
}
avfilter_end_frame(inlink->dst->outputs[0]);
}
AVFilter avfilter_vf_cropdetect = {
.name = "cropdetect",
.description = NULL_IF_CONFIG_SMALL("Auto-detect crop size."),
.priv_size = sizeof(CropDetectContext),
.init = init,
.query_formats = query_formats,
.inputs = (AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
.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}},
};
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