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FFmpeg/libavfilter/vf_cropdetect.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

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/*
* 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 "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/motion_vector.h"
#include "libavutil/qsort.h"
#include "avfilter.h"
#include "internal.h"
#include "video.h"
#include "edge_common.h"
typedef struct CropDetectContext {
const AVClass *class;
int x1, y1, x2, y2;
float limit;
float limit_upscaled;
int round;
int skip;
int reset_count;
int frame_nb;
int max_pixsteps[4];
int max_outliers;
int mode;
int window_size;
int mv_threshold;
int bitdepth;
float low, high;
uint8_t low_u8, high_u8;
uint8_t *filterbuf;
uint8_t *tmpbuf;
uint16_t *gradients;
char *directions;
int *bboxes[4];
} CropDetectContext;
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P,
AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVJ422P,
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P,
AV_PIX_FMT_YUV411P, AV_PIX_FMT_GRAY8,
AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV410P,
AV_PIX_FMT_YUV420P9 , AV_PIX_FMT_YUV422P9 , AV_PIX_FMT_YUV444P9,
AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12,
AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
AV_PIX_FMT_NV12, AV_PIX_FMT_NV21,
AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA,
AV_PIX_FMT_NONE
};
enum CropMode {
MODE_BLACK,
MODE_MV_EDGES,
MODE_NB
};
static int comp(const int *a,const int *b)
{
return FFDIFFSIGN(*a, *b);
}
static int checkline(void *ctx, const unsigned char *src, int stride, int len, int bpp)
{
int total = 0;
int div = len;
const uint16_t *src16 = (const uint16_t *)src;
switch (bpp) {
case 1:
while (len >= 8) {
total += src[ 0] + src[ stride] + src[2*stride] + src[3*stride]
+ src[4*stride] + src[5*stride] + src[6*stride] + src[7*stride];
src += 8*stride;
len -= 8;
}
while (--len >= 0) {
total += src[0];
src += stride;
}
break;
case 2:
stride >>= 1;
while (len >= 8) {
total += src16[ 0] + src16[ stride] + src16[2*stride] + src16[3*stride]
+ src16[4*stride] + src16[5*stride] + src16[6*stride] + src16[7*stride];
src16 += 8*stride;
len -= 8;
}
while (--len >= 0) {
total += src16[0];
src16 += stride;
}
break;
case 3:
case 4:
while (len >= 4) {
total += src[0] + src[1 ] + src[2 ]
+ src[ stride] + src[1+ stride] + src[2+ stride]
+ src[2*stride] + src[1+2*stride] + src[2+2*stride]
+ src[3*stride] + src[1+3*stride] + src[2+3*stride];
src += 4*stride;
len -= 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 int checkline_edge(void *ctx, const unsigned char *src, int stride, int len, int bpp)
{
const uint16_t *src16 = (const uint16_t *)src;
switch (bpp) {
case 1:
while (--len >= 0) {
if (src[0]) return 0;
src += stride;
}
break;
case 2:
stride >>= 1;
while (--len >= 0) {
if (src16[0]) return 0;
src16 += stride;
}
break;
case 3:
case 4:
while (--len >= 0) {
if (src[0] || src[1] || src[2]) return 0;
src += stride;
}
break;
}
return 1;
}
static av_cold int init(AVFilterContext *ctx)
{
CropDetectContext *s = ctx->priv;
s->frame_nb = -1 * s->skip;
s->low_u8 = s->low * 255. + .5;
s->high_u8 = s->high * 255. + .5;
av_log(ctx, AV_LOG_VERBOSE, "limit:%f round:%d skip:%d reset_count:%d\n",
s->limit, s->round, s->skip, s->reset_count);
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
CropDetectContext *s = ctx->priv;
av_freep(&s->tmpbuf);
av_freep(&s->filterbuf);
av_freep(&s->gradients);
av_freep(&s->directions);
av_freep(&s->bboxes[0]);
av_freep(&s->bboxes[1]);
av_freep(&s->bboxes[2]);
av_freep(&s->bboxes[3]);
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
CropDetectContext *s = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
const int bufsize = inlink->w * inlink->h;
av_image_fill_max_pixsteps(s->max_pixsteps, NULL, desc);
s->bitdepth = desc->comp[0].depth;
if (s->limit < 1.0)
s->limit_upscaled = s->limit * ((1 << s->bitdepth) - 1);
else
s->limit_upscaled = s->limit;
s->x1 = inlink->w - 1;
s->y1 = inlink->h - 1;
s->x2 = 0;
s->y2 = 0;
s->window_size = FFMAX(s->reset_count, 15);
s->tmpbuf = av_malloc(bufsize);
s->filterbuf = av_malloc(bufsize * s->max_pixsteps[0]);
s->gradients = av_calloc(bufsize, sizeof(*s->gradients));
s->directions = av_malloc(bufsize);
s->bboxes[0] = av_malloc(s->window_size * sizeof(*s->bboxes[0]));
s->bboxes[1] = av_malloc(s->window_size * sizeof(*s->bboxes[1]));
s->bboxes[2] = av_malloc(s->window_size * sizeof(*s->bboxes[2]));
s->bboxes[3] = av_malloc(s->window_size * sizeof(*s->bboxes[3]));
if (!s->tmpbuf || !s->filterbuf || !s->gradients || !s->directions ||
!s->bboxes[0] || !s->bboxes[1] || !s->bboxes[2] || !s->bboxes[3])
return AVERROR(ENOMEM);
return 0;
}
#define SET_META(key, value) \
av_dict_set_int(metadata, key, value, 0)
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
AVFilterContext *ctx = inlink->dst;
CropDetectContext *s = ctx->priv;
int bpp = s->max_pixsteps[0];
int w, h, x, y, shrink_by, i;
AVDictionary **metadata;
int outliers, last_y;
int limit_upscaled = lrint(s->limit_upscaled);
char limit_str[22];
const int inw = inlink->w;
const int inh = inlink->h;
uint8_t *tmpbuf = s->tmpbuf;
uint8_t *filterbuf = s->filterbuf;
uint16_t *gradients = s->gradients;
int8_t *directions = s->directions;
const AVFrameSideData *sd = NULL;
int scan_w, scan_h, bboff;
void (*sobel)(int w, int h, uint16_t *dst, int dst_linesize,
int8_t *dir, int dir_linesize,
const uint8_t *src, int src_linesize, int src_stride) = (bpp == 2) ? &ff_sobel_16 : &ff_sobel_8;
void (*gaussian_blur)(int w, int h,
uint8_t *dst, int dst_linesize,
const uint8_t *src, int src_linesize, int src_stride) = (bpp == 2) ? &ff_gaussian_blur_16 : &ff_gaussian_blur_8;
// ignore first s->skip frames
if (++s->frame_nb > 0) {
metadata = &frame->metadata;
// Reset the crop area every reset_count frames, if reset_count is > 0
if (s->reset_count > 0 && s->frame_nb > s->reset_count) {
s->x1 = frame->width - 1;
s->y1 = frame->height - 1;
s->x2 = 0;
s->y2 = 0;
s->frame_nb = 1;
}
#define FIND(DST, FROM, NOEND, INC, STEP0, STEP1, LEN) \
outliers = 0;\
for (last_y = y = FROM; NOEND; y = y INC) {\
if (checkline(ctx, frame->data[0] + STEP0 * y, STEP1, LEN, bpp) > limit_upscaled) {\
if (++outliers > s->max_outliers) { \
DST = last_y;\
break;\
}\
} else\
last_y = y INC;\
}
if (s->mode == MODE_BLACK) {
FIND(s->y1, 0, y < s->y1, +1, frame->linesize[0], bpp, frame->width);
FIND(s->y2, frame->height - 1, y > FFMAX(s->y2, s->y1), -1, frame->linesize[0], bpp, frame->width);
FIND(s->x1, 0, y < s->x1, +1, bpp, frame->linesize[0], frame->height);
FIND(s->x2, frame->width - 1, y > FFMAX(s->x2, s->x1), -1, bpp, frame->linesize[0], frame->height);
} else { // MODE_MV_EDGES
sd = av_frame_get_side_data(frame, AV_FRAME_DATA_MOTION_VECTORS);
s->x1 = 0;
s->y1 = 0;
s->x2 = inw - 1;
s->y2 = inh - 1;
if (!sd) {
av_log(ctx, AV_LOG_WARNING, "Cannot detect: no motion vectors available");
} else {
// gaussian filter to reduce noise
gaussian_blur(inw, inh,
filterbuf, inw*bpp,
frame->data[0], frame->linesize[0], bpp);
// compute the 16-bits gradients and directions for the next step
sobel(inw, inh, gradients, inw, directions, inw, filterbuf, inw*bpp, bpp);
// non_maximum_suppression() will actually keep & clip what's necessary and
// ignore the rest, so we need a clean output buffer
memset(tmpbuf, 0, inw * inh);
ff_non_maximum_suppression(inw, inh, tmpbuf, inw, directions, inw, gradients, inw);
// keep high values, or low values surrounded by high values
ff_double_threshold(s->low_u8, s->high_u8, inw, inh,
tmpbuf, inw, tmpbuf, inw);
// scan all MVs and store bounding box
s->x1 = inw - 1;
s->y1 = inh - 1;
s->x2 = 0;
s->y2 = 0;
for (i = 0; i < sd->size / sizeof(AVMotionVector); i++) {
const AVMotionVector *mv = (const AVMotionVector*)sd->data + i;
const int mx = mv->dst_x - mv->src_x;
const int my = mv->dst_y - mv->src_y;
if (mv->dst_x >= 0 && mv->dst_x < inw &&
mv->dst_y >= 0 && mv->dst_y < inh &&
mv->src_x >= 0 && mv->src_x < inw &&
mv->src_y >= 0 && mv->src_y < inh &&
mx * mx + my * my >= s->mv_threshold * s->mv_threshold) {
s->x1 = mv->dst_x < s->x1 ? mv->dst_x : s->x1;
s->y1 = mv->dst_y < s->y1 ? mv->dst_y : s->y1;
s->x2 = mv->dst_x > s->x2 ? mv->dst_x : s->x2;
s->y2 = mv->dst_y > s->y2 ? mv->dst_y : s->y2;
}
}
// assert x1<x2, y1<y2
if (s->x1 > s->x2) FFSWAP(int, s->x1, s->x2);
if (s->y1 > s->y2) FFSWAP(int, s->y1, s->y2);
// scan outward looking for 0-edge-lines in edge image
scan_w = s->x2 - s->x1;
scan_h = s->y2 - s->y1;
#define FIND_EDGE(DST, FROM, NOEND, INC, STEP0, STEP1, LEN) \
for (last_y = y = FROM; NOEND; y = y INC) { \
if (checkline_edge(ctx, tmpbuf + STEP0 * y, STEP1, LEN, bpp)) { \
if (last_y INC == y) { \
DST = y; \
break; \
} else \
last_y = y; \
} \
} \
if (!(NOEND)) { \
DST = y -(INC); \
}
FIND_EDGE(s->y1, s->y1, y >= 0, -1, inw, bpp, scan_w);
FIND_EDGE(s->y2, s->y2, y < inh, +1, inw, bpp, scan_w);
FIND_EDGE(s->x1, s->x1, y >= 0, -1, bpp, inw, scan_h);
FIND_EDGE(s->x2, s->x2, y < inw, +1, bpp, inw, scan_h);
// queue bboxes
bboff = (s->frame_nb - 1) % s->window_size;
s->bboxes[0][bboff] = s->x1;
s->bboxes[1][bboff] = s->x2;
s->bboxes[2][bboff] = s->y1;
s->bboxes[3][bboff] = s->y2;
// sort queue
bboff = FFMIN(s->frame_nb, s->window_size);
AV_QSORT(s->bboxes[0], bboff, int, comp);
AV_QSORT(s->bboxes[1], bboff, int, comp);
AV_QSORT(s->bboxes[2], bboff, int, comp);
AV_QSORT(s->bboxes[3], bboff, int, comp);
// return median of window_size elems
s->x1 = s->bboxes[0][bboff/2];
s->x2 = s->bboxes[1][bboff/2];
s->y1 = s->bboxes[2][bboff/2];
s->y2 = s->bboxes[3][bboff/2];
}
}
// round x and y (up), important for yuv colorspaces
// make sure they stay rounded!
x = (s->x1+1) & ~1;
y = (s->y1+1) & ~1;
w = s->x2 - x + 1;
h = s->y2 - y + 1;
// w and h must be divisible by 2 as well because of yuv
// colorspace problems.
if (s->round <= 1)
s->round = 16;
if (s->round % 2)
s->round *= 2;
shrink_by = w % s->round;
w -= shrink_by;
x += (shrink_by/2 + 1) & ~1;
shrink_by = h % s->round;
h -= shrink_by;
y += (shrink_by/2 + 1) & ~1;
SET_META("lavfi.cropdetect.x1", s->x1);
SET_META("lavfi.cropdetect.x2", s->x2);
SET_META("lavfi.cropdetect.y1", s->y1);
SET_META("lavfi.cropdetect.y2", s->y2);
SET_META("lavfi.cropdetect.w", w);
SET_META("lavfi.cropdetect.h", h);
SET_META("lavfi.cropdetect.x", x);
SET_META("lavfi.cropdetect.y", y);
snprintf(limit_str, sizeof(limit_str), "%f", s->limit);
av_dict_set(metadata, "lavfi.cropdetect.limit", limit_str, 0);
av_log(ctx, AV_LOG_INFO,
"x1:%d x2:%d y1:%d y2:%d w:%d h:%d x:%d y:%d pts:%"PRId64" t:%f limit:%f crop=%d:%d:%d:%d\n",
s->x1, s->x2, s->y1, s->y2, w, h, x, y, frame->pts,
frame->pts == AV_NOPTS_VALUE ? -1 : frame->pts * av_q2d(inlink->time_base),
s->limit, w, h, x, y);
}
return ff_filter_frame(inlink->dst->outputs[0], frame);
}
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
char *res, int res_len, int flags)
{
CropDetectContext *s = ctx->priv;
float old_limit = s->limit;
int ret;
if ((ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags)) < 0)
return ret;
if (old_limit != s->limit) {
if (s->limit < 1.0)
s->limit_upscaled = s->limit * ((1 << s->bitdepth) - 1);
else
s->limit_upscaled = s->limit;
s->frame_nb = s->reset_count;
}
return 0;
}
#define OFFSET(x) offsetof(CropDetectContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define TFLAGS AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption cropdetect_options[] = {
{ "limit", "Threshold below which the pixel is considered black", OFFSET(limit), AV_OPT_TYPE_FLOAT, { .dbl = 24.0/255 }, 0, 65535, TFLAGS },
{ "round", "Value by which the width/height should be divisible", OFFSET(round), AV_OPT_TYPE_INT, { .i64 = 16 }, 0, INT_MAX, FLAGS },
{ "reset", "Recalculate the crop area after this many frames", OFFSET(reset_count), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
{ "skip", "Number of initial frames to skip", OFFSET(skip), AV_OPT_TYPE_INT, { .i64 = 2 }, 0, INT_MAX, FLAGS },
{ "reset_count", "Recalculate the crop area after this many frames",OFFSET(reset_count),AV_OPT_TYPE_INT,{ .i64 = 0 }, 0, INT_MAX, FLAGS },
{ "max_outliers", "Threshold count of outliers", OFFSET(max_outliers),AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
{ "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_BLACK}, 0, MODE_NB-1, FLAGS, .unit = "mode" },
{ "black", "detect black pixels surrounding the video", 0, AV_OPT_TYPE_CONST, {.i64=MODE_BLACK}, INT_MIN, INT_MAX, FLAGS, .unit = "mode" },
{ "mvedges", "detect motion and edged surrounding the video", 0, AV_OPT_TYPE_CONST, {.i64=MODE_MV_EDGES}, INT_MIN, INT_MAX, FLAGS, .unit = "mode" },
{ "high", "Set high threshold for edge detection", OFFSET(high), AV_OPT_TYPE_FLOAT, {.dbl=25/255.}, 0, 1, FLAGS },
{ "low", "Set low threshold for edge detection", OFFSET(low), AV_OPT_TYPE_FLOAT, {.dbl=15/255.}, 0, 1, FLAGS },
{ "mv_threshold", "motion vector threshold when estimating video window size", OFFSET(mv_threshold), AV_OPT_TYPE_INT, {.i64=8}, 0, 100, FLAGS},
{ NULL }
};
AVFILTER_DEFINE_CLASS(cropdetect);
static const AVFilterPad avfilter_vf_cropdetect_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
.filter_frame = filter_frame,
},
};
const AVFilter ff_vf_cropdetect = {
.name = "cropdetect",
.description = NULL_IF_CONFIG_SMALL("Auto-detect crop size."),
.priv_size = sizeof(CropDetectContext),
.priv_class = &cropdetect_class,
.init = init,
.uninit = uninit,
FILTER_INPUTS(avfilter_vf_cropdetect_inputs),
FILTER_OUTPUTS(ff_video_default_filterpad),
FILTER_PIXFMTS_ARRAY(pix_fmts),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_METADATA_ONLY,
.process_command = process_command,
};
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