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/*
* Copyright (c) 2021 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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
*/
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "drawutils.h"
#include "internal.h"
#include "video.h"
#include <float.h>
typedef struct ShearContext {
const AVClass *class;
float shx, shy;
int interp;
uint8_t fillcolor[4]; ///< color expressed either in YUVA or RGBA colorspace for the padding area
char *fillcolor_str;
int fillcolor_enable;
int nb_planes;
int depth;
FFDrawContext draw;
FFDrawColor color;
int hsub, vsub;
int planewidth[4];
int planeheight[4];
int (*filter_slice[2])(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
} ShearContext;
typedef struct ThreadData {
AVFrame *in, *out;
} ThreadData;
#define OFFSET(x) offsetof(ShearContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption shear_options[] = {
{ "shx", "set x shear factor", OFFSET(shx), AV_OPT_TYPE_FLOAT, {.dbl=0.}, -2, 2, .flags=FLAGS },
{ "shy", "set y shear factor", OFFSET(shy), AV_OPT_TYPE_FLOAT, {.dbl=0.}, -2, 2, .flags=FLAGS },
{ "fillcolor", "set background fill color", OFFSET(fillcolor_str), AV_OPT_TYPE_STRING, {.str="black"}, 0, 0, .flags=FLAGS },
{ "c", "set background fill color", OFFSET(fillcolor_str), AV_OPT_TYPE_STRING, {.str="black"}, 0, 0, .flags=FLAGS },
{ "interp", "set interpolation", OFFSET(interp), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, .flags=FLAGS, "interp" },
{ "nearest", "nearest neighbour", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, .flags=FLAGS, "interp" },
{ "bilinear", "bilinear", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, .flags=FLAGS, "interp" },
{ NULL }
};
AVFILTER_DEFINE_CLASS(shear);
static av_cold int init(AVFilterContext *ctx)
{
ShearContext *s = ctx->priv;
if (!strcmp(s->fillcolor_str, "none"))
s->fillcolor_enable = 0;
else if (av_parse_color(s->fillcolor, s->fillcolor_str, -1, ctx) >= 0)
s->fillcolor_enable = 1;
else
return AVERROR(EINVAL);
return 0;
}
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9,
AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14,
AV_PIX_FMT_GRAY16,
AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P,
AV_PIX_FMT_YUVJ411P,
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_YUV440P10,
AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
AV_PIX_FMT_YUV440P12,
AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12, AV_PIX_FMT_YUVA444P16,
AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA422P16,
AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,
AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
AV_PIX_FMT_NONE
};
#define NN(type, name) \
static int filter_slice_nn##name(AVFilterContext *ctx, void *arg, int jobnr, \
int nb_jobs) \
{ \
ThreadData *td = arg; \
AVFrame *in = td->in; \
AVFrame *out = td->out; \
ShearContext *s = ctx->priv; \
const float shx = s->shx; \
const float shy = s->shy; \
\
for (int p = 0; p < s->nb_planes; p++) { \
const int hsub = (p == 1 || p == 2) ? s->hsub: 1; \
const int vsub = (p == 1 || p == 2) ? s->vsub: 1; \
const int width = s->planewidth[p]; \
const int height = s->planeheight[p]; \
const int wx = vsub * shx * height * 0.5f / hsub; \
const int wy = hsub * shy * width * 0.5f / vsub; \
const int slice_start = (height * jobnr) / nb_jobs; \
const int slice_end = (height * (jobnr+1)) / nb_jobs; \
const int src_linesize = in->linesize[p] / sizeof(type); \
const int dst_linesize = out->linesize[p] / sizeof(type); \
const type *src = (const type *)in->data[p]; \
type *dst = (type *)out->data[p] + slice_start * dst_linesize; \
\
for (int y = slice_start; y < slice_end; y++) { \
for (int x = 0; x < width; x++) { \
int sx = x + vsub * shx * y / hsub - wx; \
int sy = y + hsub * shy * x / vsub - wy; \
\
if (sx >= 0 && sx < width - 1 && \
sy >= 0 && sy < height - 1) { \
dst[x] = src[sy * src_linesize + sx]; \
} \
} \
\
dst += dst_linesize; \
} \
} \
\
return 0; \
}
NN(uint8_t, 8)
NN(uint16_t, 16)
#define BL(type, name) \
static int filter_slice_bl##name(AVFilterContext *ctx, void *arg, int jobnr, \
int nb_jobs) \
{ \
ThreadData *td = arg; \
AVFrame *in = td->in; \
AVFrame *out = td->out; \
ShearContext *s = ctx->priv; \
const int depth = s->depth; \
const float shx = s->shx; \
const float shy = s->shy; \
\
for (int p = 0; p < s->nb_planes; p++) { \
const int hsub = (p == 1 || p == 2) ? s->hsub: 1; \
const int vsub = (p == 1 || p == 2) ? s->vsub: 1; \
const int width = s->planewidth[p]; \
const int height = s->planeheight[p]; \
const float wx = vsub * shx * height * 0.5f / hsub; \
const float wy = hsub * shy * width * 0.5f / vsub; \
const int slice_start = (height * jobnr) / nb_jobs; \
const int slice_end = (height * (jobnr+1)) / nb_jobs; \
const int src_linesize = in->linesize[p] / sizeof(type); \
const int dst_linesize = out->linesize[p] / sizeof(type); \
const type *src = (const type *)in->data[p]; \
type *dst = (type *)out->data[p] + slice_start * dst_linesize; \
\
for (int y = slice_start; y < slice_end; y++) { \
for (int x = 0; x < width; x++) { \
const float sx = x + vsub * shx * y / hsub - wx; \
const float sy = y + hsub * shy * x / vsub - wy; \
\
if (sx >= 0 && sx < width - 1 && \
sy >= 0 && sy < height - 1) { \
float sum = 0.f; \
int ax = floorf(sx); \
int ay = floorf(sy); \
float du = sx - ax; \
float dv = sy - ay; \
int bx = FFMIN(ax + 1, width - 1); \
int by = FFMIN(ay + 1, height - 1); \
\
sum += (1.f - du) * (1.f - dv) * src[ay * src_linesize + ax];\
sum += ( du) * (1.f - dv) * src[ay * src_linesize + bx];\
sum += (1.f - du) * ( dv) * src[by * src_linesize + ax];\
sum += ( du) * ( dv) * src[by * src_linesize + bx];\
dst[x] = av_clip_uintp2_c(lrintf(sum), depth); \
} \
} \
\
dst += dst_linesize; \
} \
} \
\
return 0; \
}
BL(uint8_t, 8)
BL(uint16_t, 16)
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
ShearContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
ThreadData td;
AVFrame *out;
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, in);
/* fill background */
if (s->fillcolor_enable)
ff_fill_rectangle(&s->draw, &s->color, out->data, out->linesize,
0, 0, outlink->w, outlink->h);
td.in = in, td.out = out;
ff_filter_execute(ctx, s->filter_slice[s->interp], &td, NULL,
FFMIN(s->planeheight[1], ff_filter_get_nb_threads(ctx)));
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
ShearContext *s = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
s->nb_planes = av_pix_fmt_count_planes(outlink->format);
s->depth = desc->comp[0].depth;
s->hsub = 1 << desc->log2_chroma_w;
s->vsub = 1 << desc->log2_chroma_h;
s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(ctx->inputs[0]->w, desc->log2_chroma_w);
s->planewidth[0] = s->planewidth[3] = ctx->inputs[0]->w;
s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(ctx->inputs[0]->h, desc->log2_chroma_h);
s->planeheight[0] = s->planeheight[3] = ctx->inputs[0]->h;
ff_draw_init(&s->draw, outlink->format, 0);
ff_draw_color(&s->draw, &s->color, s->fillcolor);
s->filter_slice[0] = s->depth <= 8 ? filter_slice_nn8 : filter_slice_nn16;
s->filter_slice[1] = s->depth <= 8 ? filter_slice_bl8 : filter_slice_bl16;
return 0;
}
static int process_command(AVFilterContext *ctx,
const char *cmd,
const char *arg,
char *res,
int res_len,
int flags)
{
ShearContext *s = ctx->priv;
int ret;
ret = ff_filter_process_command(ctx, cmd, arg, res, res_len, flags);
if (ret < 0)
return ret;
ret = init(ctx);
if (ret < 0)
return ret;
ff_draw_color(&s->draw, &s->color, s->fillcolor);
return 0;
}
static const AVFilterPad inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
};
static const AVFilterPad outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
};
const AVFilter ff_vf_shear = {
.name = "shear",
.description = NULL_IF_CONFIG_SMALL("Shear transform the input image."),
.priv_size = sizeof(ShearContext),
.init = init,
FILTER_INPUTS(inputs),
FILTER_OUTPUTS(outputs),
FILTER_PIXFMTS_ARRAY(pix_fmts),
.priv_class = &shear_class,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
.process_command = process_command,
};
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