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lavfi: add rotate filter 

Based on the libavfilter SOC filter by Vitor Sessak, with the following additions:
* integer arithmetic
* bilinear interpolation
* RGB path
* configurable parametric angle, output width and height

Address trac issue #1500.

See thread:
Subject: [FFmpeg-devel] [WIP] rotate filter(s)
Date: 2010-10-03 17:35:49 GMT
tags/n2.0
Stefano Sabatini 12 years ago
parent
0ec65aa104
commit
dc5e26d67f
6 changed files with 558 additions and 2 deletions
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  1. +1
    -0
      Changelog
  2. +112
    -0
      doc/filters.texi
  3. +1
    -0
      libavfilter/Makefile
  4. +1
    -0
      libavfilter/allfilters.c
  5. +2
    -2
      libavfilter/version.h
  6. +441
    -0
      libavfilter/vf_rotate.c

+ 1
- 0
Changelog View File

@@ -66,6 +66,7 @@ version <next>:
- sab filter ported from libmpcodecs
- ffprobe -show_chapters option
- WavPack encoding through libwavpack
- rotate filter


version 1.2:


+ 112
- 0
doc/filters.texi View File

@@ -5771,6 +5771,118 @@ much, but it will increase the amount of blurring needed to cover over
the image and will destroy more information than necessary, and extra
pixels will slow things down on a large logo.

@section rotate

Rotate video by an arbitrary angle expressed in radians.

The filter accepts the following options:

A description of the optional parameters follows.
@table @option
@item angle, a
Set an expression for the angle by which to rotate the input video
clockwise, expressed as a number of radians. A negative value will
result in a counter-clockwise rotation. By default it is set to "0".

This expression is evaluated for each frame.

@item out_w, ow
Set the output width expression, default value is "iw".
This expression is evaluated just once during configuration.

@item out_h, oh
Set the output height expression, default value is "ih".
This expression is evaluated just once during configuration.

@item bilinear
Enable bilinear interpolation if set to 1, a value of 0 disables
it. Default value is 1.

@item fillcolor, c
Set the color used to fill the output area not covered by the rotated
image. If the special value "none" is selected then no background is
printed (useful for example if the background is never shown). Default
value is "black".
@end table

The expressions for the angle and the output size can contain the
following constants and functions:

@table @option
@item n
sequential number of the input frame, starting from 0. It is always NAN
before the first frame is filtered.

@item t
time in seconds of the input frame, it is set to 0 when the filter is
configured. It is always NAN before the first frame is filtered.

@item hsub
@item vsub
horizontal and vertical chroma subsample values. For example for the
pixel format "yuv422p" @var{hsub} is 2 and @var{vsub} is 1.

@item in_w, iw
@item in_h, ih
the input video width and heigth

@item out_w, ow
@item out_h, oh
the output width and heigth, that is the size of the padded area as
specified by the @var{width} and @var{height} expressions

@item rotw(a)
@item roth(a)
the minimal width/height required for completely containing the input
video rotated by @var{a} radians.

These are only available when computing the @option{out_w} and
@option{out_h} expressions.
@end table

@subsection Examples

@itemize
@item
Rotate the input by PI/6 radians clockwise:
@example
rotate=PI/6
@end example

@item
Rotate the input by PI/6 radians counter-clockwise:
@example
rotate=-PI/6
@end example

@item
Apply a constant rotation with period T, starting from an angle of PI/3:
@example
rotate=PI/3+2*PI*t/T
@end example

@item
Make the input video rotation oscillating with a period of T
seconds and an amplitude of A radians:
@example
rotate=A*sin(2*PI/T*t)
@end example

@item
Rotate the video, output size is choosen so that the whole rotating
input video is always completely contained in the output:
@example
rotate='2*PI*t:ow=hypot(iw,ih):oh=ow'
@end example

@item
Rotate the video, reduce the output size so that no background is ever
shown:
@example
rotate=2*PI*t:ow='min(iw,ih)/sqrt(2)':oh=ow:c=none
@end example
@end itemize

@section sab

Apply Shape Adaptive Blur.


+ 1
- 0
libavfilter/Makefile View File

@@ -168,6 +168,7 @@ OBJS-$(CONFIG_PERMS_FILTER) += f_perms.o
OBJS-$(CONFIG_PIXDESCTEST_FILTER) += vf_pixdesctest.o
OBJS-$(CONFIG_PP_FILTER) += vf_pp.o
OBJS-$(CONFIG_REMOVELOGO_FILTER) += bbox.o lswsutils.o lavfutils.o vf_removelogo.o
OBJS-$(CONFIG_ROTATE_FILTER) += vf_rotate.o
OBJS-$(CONFIG_SEPARATEFIELDS_FILTER) += vf_separatefields.o
OBJS-$(CONFIG_SAB_FILTER) += vf_sab.o
OBJS-$(CONFIG_SCALE_FILTER) += vf_scale.o


+ 1
- 0
libavfilter/allfilters.c View File

@@ -163,6 +163,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(PIXDESCTEST, pixdesctest, vf);
REGISTER_FILTER(PP, pp, vf);
REGISTER_FILTER(REMOVELOGO, removelogo, vf);
REGISTER_FILTER(ROTATE, rotate, vf);
REGISTER_FILTER(SAB, sab, vf);
REGISTER_FILTER(SCALE, scale, vf);
REGISTER_FILTER(SELECT, select, vf);


+ 2
- 2
libavfilter/version.h View File

@@ -30,8 +30,8 @@
#include "libavutil/avutil.h"

#define LIBAVFILTER_VERSION_MAJOR 3
#define LIBAVFILTER_VERSION_MINOR 75
#define LIBAVFILTER_VERSION_MICRO 101
#define LIBAVFILTER_VERSION_MINOR 76
#define LIBAVFILTER_VERSION_MICRO 100

#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \


+ 441
- 0
libavfilter/vf_rotate.c View File

@@ -0,0 +1,441 @@
/*
* Copyright (c) 2013 Stefano Sabatini
* Copyright (c) 2008 Vitor Sessak
*
* 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
*/

/**
* @file
* rotation filter, partially based on the tests/rotozoom.c program
*/

#include "libavutil/avstring.h"
#include "libavutil/eval.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"

static const char *var_names[] = {
"in_w" , "iw", ///< width of the input video
"in_h" , "ih", ///< height of the input video
"out_w", "ow", ///< width of the input video
"out_h", "oh", ///< height of the input video
"hsub", "vsub",
"n", ///< number of frame
"t", ///< timestamp expressed in seconds
NULL
};

enum var_name {
VAR_IN_W , VAR_IW,
VAR_IN_H , VAR_IH,
VAR_OUT_W, VAR_OW,
VAR_OUT_H, VAR_OH,
VAR_HSUB, VAR_VSUB,
VAR_N,
VAR_T,
VAR_VARS_NB
};

typedef struct {
const AVClass *class;
double angle;
char *angle_expr_str; ///< expression for the angle
AVExpr *angle_expr; ///< parsed expression for the angle
char *outw_expr_str, *outh_expr_str;
int outh, outw;
uint8_t fillcolor[4]; ///< color expressed either in YUVA or RGBA colorspace for the padding area
char *fillcolor_str;
int fillcolor_enable;
int hsub, vsub;
int nb_planes;
int use_bilinear;
uint8_t *line[4];
int linestep[4];
float sinx, cosx;
double var_values[VAR_VARS_NB];
} RotContext;

#define OFFSET(x) offsetof(RotContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

static const AVOption rotate_options[] = {
{ "angle", "set angle (in radians)", OFFSET(angle_expr_str), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, .flags=FLAGS },
{ "a", "set angle (in radians)", OFFSET(angle_expr_str), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, .flags=FLAGS },
{ "out_w", "set output width expression", OFFSET(outw_expr_str), AV_OPT_TYPE_STRING, {.str="iw"}, CHAR_MIN, CHAR_MAX, .flags=FLAGS },
{ "ow", "set output width expression", OFFSET(outw_expr_str), AV_OPT_TYPE_STRING, {.str="iw"}, CHAR_MIN, CHAR_MAX, .flags=FLAGS },
{ "out_h", "set output height expression", OFFSET(outh_expr_str), AV_OPT_TYPE_STRING, {.str="ih"}, CHAR_MIN, CHAR_MAX, .flags=FLAGS },
{ "oh", "set output width expression", OFFSET(outh_expr_str), AV_OPT_TYPE_STRING, {.str="ih"}, CHAR_MIN, CHAR_MAX, .flags=FLAGS },
{ "fillcolor", "set background fill color", OFFSET(fillcolor_str), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX, .flags=FLAGS },
{ "c", "set background fill color", OFFSET(fillcolor_str), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX, .flags=FLAGS },
{ "bilinear", "use bilinear interpolation", OFFSET(use_bilinear), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, .flags=FLAGS },
{ NULL }
};

AVFILTER_DEFINE_CLASS(rotate);

static av_cold int init(AVFilterContext *ctx)
{
RotContext *rot = ctx->priv;

if (!strcmp(rot->fillcolor_str, "none"))
rot->fillcolor_enable = 0;
else if (av_parse_color(rot->fillcolor, rot->fillcolor_str, -1, ctx) >= 0)
rot->fillcolor_enable = 1;
else
return AVERROR(EINVAL);
return 0;
}

static av_cold void uninit(AVFilterContext *ctx)
{
RotContext *rot = ctx->priv;
int i;

for (i = 0; i < 4; i++)
av_freep(&rot->line[i]);

av_expr_free(rot->angle_expr);
rot->angle_expr = NULL;
}

static int query_formats(AVFilterContext *ctx)
{
static enum PixelFormat pix_fmts[] = {
AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
AV_PIX_FMT_GRAY8,
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P,
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P,
AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_NONE
};

ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
return 0;
}

static double get_rotated_w(void *opaque, double angle)
{
RotContext *rot = opaque;
double inw = rot->var_values[VAR_IN_W];
double inh = rot->var_values[VAR_IN_H];
float sinx = sin(angle);
float cosx = cos(angle);

return FFMAX(0, inh * sinx) + FFMAX(0, -inw * cosx) +
FFMAX(0, inw * cosx) + FFMAX(0, -inh * sinx);
}

static double get_rotated_h(void *opaque, double angle)
{
RotContext *rot = opaque;
double inw = rot->var_values[VAR_IN_W];
double inh = rot->var_values[VAR_IN_H];
float sinx = sin(angle);
float cosx = cos(angle);

return FFMAX(0, -inh * cosx) + FFMAX(0, -inw * sinx) +
FFMAX(0, inh * cosx) + FFMAX(0, inw * sinx);
}

static double (* const func1[])(void *, double) = {
get_rotated_w,
get_rotated_h,
NULL
};

static const char * const func1_names[] = {
"rotw",
"roth",
NULL
};

static int config_props(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
RotContext *rot = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
const AVPixFmtDescriptor *pixdesc = av_pix_fmt_desc_get(inlink->format);
uint8_t rgba_color[4];
int is_packed_rgba, ret;
double res;
char *expr;

rot->hsub = pixdesc->log2_chroma_w;
rot->vsub = pixdesc->log2_chroma_h;

rot->var_values[VAR_IN_W] = rot->var_values[VAR_IW] = inlink->w;
rot->var_values[VAR_IN_H] = rot->var_values[VAR_IH] = inlink->h;
rot->var_values[VAR_HSUB] = 1<<rot->hsub;
rot->var_values[VAR_VSUB] = 1<<rot->vsub;
rot->var_values[VAR_N] = NAN;
rot->var_values[VAR_T] = NAN;
rot->var_values[VAR_OUT_W] = rot->var_values[VAR_OW] = NAN;
rot->var_values[VAR_OUT_H] = rot->var_values[VAR_OH] = NAN;

av_expr_free(rot->angle_expr);
rot->angle_expr = NULL;
if ((ret = av_expr_parse(&rot->angle_expr, expr = rot->angle_expr_str, var_names,
func1_names, func1, NULL, NULL, 0, ctx)) < 0) {
av_log(ctx, AV_LOG_ERROR,
"Error occurred parsing angle expression '%s'\n", rot->angle_expr_str);
return ret;
}

#define SET_SIZE_EXPR(name, opt_name) do { \
ret = av_expr_parse_and_eval(&res, expr = rot->name##_expr_str, \
var_names, rot->var_values, \
func1_names, func1, NULL, NULL, rot, 0, ctx); \
if (ret < 0 || isnan(res) || isinf(res) || res <= 0) { \
av_log(ctx, AV_LOG_ERROR, \
"Error parsing or evaluating expression for option %s: " \
"invalid expression '%s' or non-positive or indefinite value %f\n", \
opt_name, expr, res); \
return ret; \
} \
} while (0)

/* evaluate width and height */
av_expr_parse_and_eval(&res, expr = rot->outw_expr_str, var_names, rot->var_values,
func1_names, func1, NULL, NULL, rot, 0, ctx);
rot->var_values[VAR_OUT_W] = rot->var_values[VAR_OW] = res;
rot->outw = res + 0.5;
SET_SIZE_EXPR(outh, "out_w");
rot->var_values[VAR_OUT_H] = rot->var_values[VAR_OH] = res;
rot->outh = res + 0.5;

/* evaluate the width again, as it may depend on the evaluated output height */
SET_SIZE_EXPR(outw, "out_h");
rot->var_values[VAR_OUT_W] = rot->var_values[VAR_OW] = res;
rot->outw = res + 0.5;

/* compute number of planes */
rot->nb_planes = av_pix_fmt_count_planes(inlink->format);
outlink->w = rot->outw;
outlink->h = rot->outh;

memcpy(rgba_color, rot->fillcolor, sizeof(rgba_color));
ff_fill_line_with_color(rot->line, rot->linestep, outlink->w, rot->fillcolor,
outlink->format, rgba_color, &is_packed_rgba, NULL);
av_log(ctx, AV_LOG_INFO,
"w:%d h:%d -> w:%d h:%d bgcolor:0x%02X%02X%02X%02X[%s]\n",
inlink->w, inlink->h, outlink->w, outlink->h,
rot->fillcolor[0], rot->fillcolor[1], rot->fillcolor[2], rot->fillcolor[3],
is_packed_rgba ? "rgba" : "yuva");

return 0;
}

#define FIXP (1<<16)
#define INT_PI 205887 //(M_PI * FIXP)

/**
* Compute the sin of a using integer values.
* Input and output values are scaled by FIXP.
*/
static int64_t int_sin(int64_t a)
{
int64_t a2, res = 0;
int i;
if (a < 0) a = INT_PI-a; // 0..inf
a %= 2 * INT_PI; // 0..2PI

if (a >= INT_PI*3/2) a -= 2*INT_PI; // -PI/2 .. 3PI/2
if (a >= INT_PI/2 ) a = INT_PI - a; // -PI/2 .. PI/2

/* compute sin using Taylor series approximated to the third term */
a2 = (a*a)/FIXP;
for (i = 2; i < 7; i += 2) {
res += a;
a = -a*a2 / (FIXP*i*(i+1));
}
return res;
}

/**
* Interpolate the color in src at position x and y using bilinear
* interpolation.
*/
static uint8_t *interpolate_bilinear(uint8_t *dst_color,
const uint8_t *src, int src_linesize, int src_linestep,
int x, int y, int max_x, int max_y)
{
int int_x = av_clip(x>>16, 0, max_x);
int int_y = av_clip(y>>16, 0, max_y);
int frac_x = x&0xFFFF;
int frac_y = y&0xFFFF;
int i;
int int_x1 = FFMIN(int_x+1, max_x);
int int_y1 = FFMIN(int_y+1, max_y);

for (i = 0; i < src_linestep; i++) {
int s00 = src[src_linestep * int_x + i + src_linesize * int_y ];
int s01 = src[src_linestep * int_x1 + i + src_linesize * int_y ];
int s10 = src[src_linestep * int_x + i + src_linesize * int_y1];
int s11 = src[src_linestep * int_x1 + i + src_linesize * int_y1];
int s0 = (((1<<16) - frac_x)*s00 + frac_x*s01);
int s1 = (((1<<16) - frac_x)*s10 + frac_x*s11);

dst_color[i] = ((int64_t)((1<<16) - frac_y)*s0 + (int64_t)frac_y*s1) >> 32;
}

return dst_color;
}

#define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts)*av_q2d(tb))

static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *out;
RotContext *rot = ctx->priv;
int angle_int, s, c, plane;
double res;

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);

rot->var_values[VAR_N] = inlink->frame_count;
rot->var_values[VAR_T] = TS2T(in->pts, inlink->time_base);
rot->angle = res = av_expr_eval(rot->angle_expr, rot->var_values, rot);

av_log(ctx, AV_LOG_DEBUG, "n:%f time:%f angle:%f/PI\n",
rot->var_values[VAR_N], rot->var_values[VAR_T], rot->angle/M_PI);

angle_int = res * FIXP;
s = int_sin(angle_int);
c = int_sin(angle_int + INT_PI/2);

/* fill background */
if (rot->fillcolor_enable)
ff_draw_rectangle(out->data, out->linesize,
rot->line, rot->linestep, rot->hsub, rot->vsub,
0, 0, outlink->w, outlink->h);

for (plane = 0; plane < rot->nb_planes; plane++) {
int hsub = plane == 1 || plane == 2 ? rot->hsub : 0;
int vsub = plane == 1 || plane == 2 ? rot->vsub : 0;
int inw = FF_CEIL_RSHIFT(inlink->w, hsub);
int inh = FF_CEIL_RSHIFT(inlink->h, vsub);
int outw = FF_CEIL_RSHIFT(outlink->w, hsub);
int outh = FF_CEIL_RSHIFT(outlink->h, hsub);

const int xi = -outw/2 * c;
const int yi = outw/2 * s;
int xprime = -outh/2 * s;
int yprime = -outh/2 * c;
int i, j, x, y;

for (j = 0; j < outh; j++) {
x = xprime + xi + FIXP*inw/2;
y = yprime + yi + FIXP*inh/2;

for (i = 0; i < outw; i++) {
int32_t v;
int x1, y1;
uint8_t *pin, *pout;
x += c;
y -= s;
x1 = x>>16;
y1 = y>>16;

/* the out-of-range values avoid border artifacts */
if (x1 >= -1 && x1 <= inw && y1 >= -1 && y1 <= inh) {
uint8_t inp_inv[4]; /* interpolated input value */
pout = out->data[plane] + j * out->linesize[plane] + i * rot->linestep[plane];
if (rot->use_bilinear) {
pin = interpolate_bilinear(inp_inv,
in->data[plane], in->linesize[plane], rot->linestep[plane],
x, y, inw-1, inh-1);
} else {
int x2 = av_clip(x1, 0, inw-1);
int y2 = av_clip(y1, 0, inh-1);
pin = in->data[plane] + y2 * in->linesize[plane] + x2 * rot->linestep[plane];
}
switch (rot->linestep[plane]) {
case 1:
*pout = *pin;
break;
case 2:
*((uint16_t *)pout) = *((uint16_t *)pin);
break;
case 3:
v = AV_RB24(pin);
AV_WB24(pout, v);
break;
case 4:
*((uint32_t *)pout) = *((uint32_t *)pin);
break;
default:
memcpy(pout, pin, rot->linestep[plane]);
break;
}
}
}
xprime += s;
yprime += c;
}
}

av_frame_free(&in);
return ff_filter_frame(outlink, out);
}

static const AVFilterPad rotate_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
{ NULL }
};

static const AVFilterPad rotate_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_props,
},
{ NULL }
};

AVFilter avfilter_vf_rotate = {
.name = "rotate",
.description = NULL_IF_CONFIG_SMALL("Rotate the input image."),
.priv_size = sizeof(RotContext),
.init = init,
.uninit = uninit,
.query_formats = query_formats,
.inputs = rotate_inputs,
.outputs = rotate_outputs,
.priv_class = &rotate_class,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};

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