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/*
* Copyright (c) 2014-2015 Michael Niedermayer <michaelni@gmx.at>
*
* 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.
*/
/**
* @todo switch to dualinput
*/
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "filters.h"
#include "internal.h"
#include "video.h"
#include "lavfutils.h"
enum mode {
MODE_COVER,
MODE_BLUR,
NB_MODES
};
typedef struct CoverContext {
AVClass *class;
int mode;
char *cover_filename;
AVFrame *cover_frame;
int width, height;
} CoverContext;
#define OFFSET(x) offsetof(CoverContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption cover_rect_options[] = {
{ "cover", "cover bitmap filename", OFFSET(cover_filename), AV_OPT_TYPE_STRING, {.str = NULL}, .flags = FLAGS },
{ "mode", "set removal mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64 = MODE_BLUR}, 0, NB_MODES - 1, FLAGS, "mode" },
{ "cover", "cover area with bitmap", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_COVER}, INT_MIN, INT_MAX, FLAGS, "mode" },
{ "blur", "blur area", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_BLUR}, INT_MIN, INT_MAX, FLAGS, "mode" },
{ NULL }
};
AVFILTER_DEFINE_CLASS(cover_rect);
static int config_input(AVFilterLink *inlink)
{
return 0;
}
static void cover_rect(CoverContext *cover, AVFrame *in, int offx, int offy)
{
int x, y, p;
for (p = 0; p < 3; p++) {
uint8_t *data = in->data[p] + (offx>>!!p) + (offy>>!!p) * in->linesize[p];
const uint8_t *src = cover->cover_frame->data[p];
int w = AV_CEIL_RSHIFT(cover->cover_frame->width , !!p);
int h = AV_CEIL_RSHIFT(cover->cover_frame->height, !!p);
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
data[x] = src[x];
}
data += in->linesize[p];
src += cover->cover_frame->linesize[p];
}
}
}
static void blur(CoverContext *cover, AVFrame *in, int offx, int offy)
{
int x, y, p;
for (p=0; p<3; p++) {
int ox = offx>>!!p;
int oy = offy>>!!p;
int stride = in->linesize[p];
uint8_t *data = in->data[p] + ox + oy * stride;
int w = AV_CEIL_RSHIFT(cover->width , !!p);
int h = AV_CEIL_RSHIFT(cover->height, !!p);
int iw = AV_CEIL_RSHIFT(in->width , !!p);
int ih = AV_CEIL_RSHIFT(in->height, !!p);
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
int c = 0;
int s = 0;
if (ox) {
int scale = 65536 / (x + 1);
s += data[-1 + y*stride] * scale;
c += scale;
}
if (oy) {
int scale = 65536 / (y + 1);
s += data[x - stride] * scale;
c += scale;
}
if (ox + w < iw) {
int scale = 65536 / (w - x);
s += data[w + y*stride] * scale;
c += scale;
}
if (oy + h < ih) {
int scale = 65536 / (h - y);
s += data[x + h*stride] * scale;
c += scale;
}
data[x + y*stride] = c ? (s + (c>>1)) / c : 0;
}
}
}
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
CoverContext *cover = ctx->priv;
AVDictionaryEntry *ex, *ey, *ew, *eh;
int ret, x = -1, y = -1, w = -1, h = -1;
char *xendptr = NULL, *yendptr = NULL, *wendptr = NULL, *hendptr = NULL;
ex = av_dict_get(in->metadata, "lavfi.rect.x", NULL, AV_DICT_MATCH_CASE);
ey = av_dict_get(in->metadata, "lavfi.rect.y", NULL, AV_DICT_MATCH_CASE);
ew = av_dict_get(in->metadata, "lavfi.rect.w", NULL, AV_DICT_MATCH_CASE);
eh = av_dict_get(in->metadata, "lavfi.rect.h", NULL, AV_DICT_MATCH_CASE);
if (ex && ey && ew && eh) {
x = strtol(ex->value, &xendptr, 10);
y = strtol(ey->value, ¥dptr, 10);
w = strtol(ew->value, &wendptr, 10);
h = strtol(eh->value, &hendptr, 10);
}
if (!xendptr || *xendptr || !yendptr || *yendptr ||
!wendptr || *wendptr || !hendptr || *hendptr
) {
return ff_filter_frame(ctx->outputs[0], in);
}
if (x < 0) {
w += x;
x = 0;
}
if (y < 0) {
h += y;
y = 0;
}
w = FFMIN(w, in->width - x);
h = FFMIN(h, in->height - y);
if (w > in->width || h > in->height || w <= 0 || h <= 0)
return AVERROR(EINVAL);
if (cover->cover_frame) {
if (w != cover->cover_frame->width || h != cover->cover_frame->height)
return AVERROR(EINVAL);
}
cover->width = w;
cover->height = h;
x = av_clip(x, 0, in->width - w);
y = av_clip(y, 0, in->height - h);
ret = ff_inlink_make_frame_writable(inlink, &in);
if (ret < 0) {
av_frame_free(&in);
return ret;
}
if (cover->mode == MODE_BLUR) {
blur (cover, in, x, y);
} else {
cover_rect(cover, in, x, y);
}
return ff_filter_frame(ctx->outputs[0], in);
}
static av_cold void uninit(AVFilterContext *ctx)
{
CoverContext *cover = ctx->priv;
if (cover->cover_frame)
av_freep(&cover->cover_frame->data[0]);
av_frame_free(&cover->cover_frame);
}
static av_cold int init(AVFilterContext *ctx)
{
CoverContext *cover = ctx->priv;
int ret;
if (cover->mode == MODE_COVER) {
if (!cover->cover_filename) {
av_log(ctx, AV_LOG_ERROR, "cover filename not set\n");
return AVERROR(EINVAL);
}
cover->cover_frame = av_frame_alloc();
if (!cover->cover_frame)
return AVERROR(ENOMEM);
if ((ret = ff_load_image(cover->cover_frame->data, cover->cover_frame->linesize,
&cover->cover_frame->width, &cover->cover_frame->height,
&cover->cover_frame->format, cover->cover_filename, ctx)) < 0)
return ret;
if (cover->cover_frame->format != AV_PIX_FMT_YUV420P && cover->cover_frame->format != AV_PIX_FMT_YUVJ420P) {
av_log(ctx, AV_LOG_ERROR, "cover image is not a YUV420 image\n");
return AVERROR(EINVAL);
}
}
return 0;
}
static const AVFilterPad cover_rect_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
.filter_frame = filter_frame,
},
};
const AVFilter ff_vf_cover_rect = {
.name = "cover_rect",
.description = NULL_IF_CONFIG_SMALL("Find and cover a user specified object."),
.priv_size = sizeof(CoverContext),
.init = init,
.uninit = uninit,
FILTER_INPUTS(cover_rect_inputs),
FILTER_OUTPUTS(ff_video_default_filterpad),
FILTER_PIXFMTS(AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P),
.priv_class = &cover_rect_class,
};
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