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FFmpeg/libavfilter/vf_rotate.c
Andreas Rheinhardt b4f5201967 avfilter: Replace query_formats callback with union of list and callback 
If one looks at the many query_formats callbacks in existence,
one will immediately recognize that there is one type of default
callback for video and a slightly different default callback for
audio: It is "return ff_set_common_formats_from_list(ctx, pix_fmts);"
for video with a filter-specific pix_fmts list. For audio, it is
the same with a filter-specific sample_fmts list together with
ff_set_common_all_samplerates() and ff_set_common_all_channel_counts().

This commit allows to remove the boilerplate query_formats callbacks
by replacing said callback with a union consisting the old callback
and pointers for pixel and sample format arrays. For the not uncommon
case in which these lists only contain a single entry (besides the
sentinel) enum AVPixelFormat and enum AVSampleFormat fields are also
added to the union to store them directly in the AVFilter,
thereby avoiding a relocation.

The state of said union will be contained in a new, dedicated AVFilter
field (the nb_inputs and nb_outputs fields have been shrunk to uint8_t
in order to create a hole for this new field; this is no problem, as
the maximum of all the nb_inputs is four; for nb_outputs it is only
two).

The state's default value coincides with the earlier default of
query_formats being unset, namely that the filter accepts all formats
(and also sample rates and channel counts/layouts for audio)
provided that these properties agree coincide for all inputs and
outputs.

By using different union members for audio and video filters
the type-unsafety of using the same functions for audio and video
lists will furthermore be more confined to formats.c than before.

When the new fields are used, they will also avoid allocations:
Currently something nearly equivalent to ff_default_query_formats()
is called after every successful call to a query_formats callback;
yet in the common case that the newly allocated AVFilterFormats
are not used at all (namely if there are no free links) these newly
allocated AVFilterFormats are freed again without ever being used.
Filters no longer using the callback will not exhibit this any more.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2021-10-05 17:48:25 +02:00

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/*
* 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"
#include <float.h>
static const char * const 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 RotContext {
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;
float sinx, cosx;
double var_values[VAR_VARS_NB];
FFDrawContext draw;
FFDrawColor color;
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);
} RotContext;
typedef struct ThreadData {
AVFrame *in, *out;
int inw, inh;
int outw, outh;
int plane;
int xi, yi;
int xprime, yprime;
int c, s;
} ThreadData;
#define OFFSET(x) offsetof(RotContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
#define TFLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption rotate_options[] = {
{ "angle", "set angle (in radians)", OFFSET(angle_expr_str), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, .flags=TFLAGS },
{ "a", "set angle (in radians)", OFFSET(angle_expr_str), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, .flags=TFLAGS },
{ "out_w", "set output width expression", OFFSET(outw_expr_str), AV_OPT_TYPE_STRING, {.str="iw"}, 0, 0, .flags=FLAGS },
{ "ow", "set output width expression", OFFSET(outw_expr_str), AV_OPT_TYPE_STRING, {.str="iw"}, 0, 0, .flags=FLAGS },
{ "out_h", "set output height expression", OFFSET(outh_expr_str), AV_OPT_TYPE_STRING, {.str="ih"}, 0, 0, .flags=FLAGS },
{ "oh", "set output height expression", OFFSET(outh_expr_str), AV_OPT_TYPE_STRING, {.str="ih"}, 0, 0, .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 },
{ "bilinear", "use bilinear interpolation", OFFSET(use_bilinear), AV_OPT_TYPE_BOOL, {.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;
av_expr_free(rot->angle_expr);
rot->angle_expr = NULL;
}
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
AV_PIX_FMT_0RGB, AV_PIX_FMT_RGB0,
AV_PIX_FMT_0BGR, AV_PIX_FMT_BGR0,
AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
AV_PIX_FMT_GRAY8,
AV_PIX_FMT_YUV410P,
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_YUV420P10LE, AV_PIX_FMT_YUVA420P10LE,
AV_PIX_FMT_YUV444P10LE, AV_PIX_FMT_YUVA444P10LE,
AV_PIX_FMT_YUV420P12LE,
AV_PIX_FMT_YUV444P12LE,
AV_PIX_FMT_YUV444P16LE, AV_PIX_FMT_YUVA444P16LE,
AV_PIX_FMT_YUV420P16LE, AV_PIX_FMT_YUVA420P16LE,
AV_PIX_FMT_YUV444P9LE, AV_PIX_FMT_YUVA444P9LE,
AV_PIX_FMT_YUV420P9LE, AV_PIX_FMT_YUVA420P9LE,
AV_PIX_FMT_NONE
};
return ff_set_common_formats_from_list(ctx, pix_fmts);
}
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
};
#define FIXP (1<<16)
#define FIXP2 (1<<20)
#define INT_PI 3294199 //(M_PI * FIXP2)
/**
* Compute the sin of a using integer values.
* Input is scaled by FIXP2 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 fifth term */
a2 = (a*a)/(FIXP2);
for (i = 2; i < 11; i += 2) {
res += a;
a = -a*a2 / (FIXP2*i*(i+1));
}
return (res + 8)>>4;
}
/**
* Interpolate the color in src at position x and y using bilinear
* interpolation.
*/
static uint8_t *interpolate_bilinear8(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;
}
/**
* Interpolate the color in src at position x and y using bilinear
* interpolation.
*/
static uint8_t *interpolate_bilinear16(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+=2) {
int s00 = AV_RL16(&src[src_linestep * int_x + i + src_linesize * int_y ]);
int s01 = AV_RL16(&src[src_linestep * int_x1 + i + src_linesize * int_y ]);
int s10 = AV_RL16(&src[src_linestep * int_x + i + src_linesize * int_y1]);
int s11 = AV_RL16(&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);
AV_WL16(&dst_color[i], ((int64_t)((1<<16) - frac_y)*s0 + (int64_t)frac_y*s1) >> 32);
}
return dst_color;
}
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);
int ret;
double res;
char *expr;
ff_draw_init(&rot->draw, inlink->format, 0);
ff_draw_color(&rot->draw, &rot->color, rot->fillcolor);
rot->hsub = pixdesc->log2_chroma_w;
rot->vsub = pixdesc->log2_chroma_h;
if (pixdesc->comp[0].depth == 8)
rot->interpolate_bilinear = interpolate_bilinear8;
else
rot->interpolate_bilinear = interpolate_bilinear16;
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_h");
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_w");
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;
return 0;
}
static av_always_inline void copy_elem(uint8_t *pout, const uint8_t *pin, int elem_size)
{
int v;
switch (elem_size) {
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, elem_size);
break;
}
}
static av_always_inline void simple_rotate_internal(uint8_t *dst, const uint8_t *src, int src_linesize, int angle, int elem_size, int len)
{
int i;
switch(angle) {
case 0:
memcpy(dst, src, elem_size * len);
break;
case 1:
for (i = 0; i<len; i++)
copy_elem(dst + i*elem_size, src + (len-i-1)*src_linesize, elem_size);
break;
case 2:
for (i = 0; i<len; i++)
copy_elem(dst + i*elem_size, src + (len-i-1)*elem_size, elem_size);
break;
case 3:
for (i = 0; i<len; i++)
copy_elem(dst + i*elem_size, src + i*src_linesize, elem_size);
break;
}
}
static av_always_inline void simple_rotate(uint8_t *dst, const uint8_t *src, int src_linesize, int angle, int elem_size, int len)
{
switch(elem_size) {
case 1 : simple_rotate_internal(dst, src, src_linesize, angle, 1, len); break;
case 2 : simple_rotate_internal(dst, src, src_linesize, angle, 2, len); break;
case 3 : simple_rotate_internal(dst, src, src_linesize, angle, 3, len); break;
case 4 : simple_rotate_internal(dst, src, src_linesize, angle, 4, len); break;
default: simple_rotate_internal(dst, src, src_linesize, angle, elem_size, len); break;
}
}
static int filter_slice(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
{
ThreadData *td = arg;
AVFrame *in = td->in;
AVFrame *out = td->out;
RotContext *rot = ctx->priv;
const int outw = td->outw, outh = td->outh;
const int inw = td->inw, inh = td->inh;
const int plane = td->plane;
const int xi = td->xi, yi = td->yi;
const int c = td->c, s = td->s;
const int start = (outh * job ) / nb_jobs;
const int end = (outh * (job+1)) / nb_jobs;
int xprime = td->xprime + start * s;
int yprime = td->yprime + start * c;
int i, j, x, y;
for (j = start; j < end; j++) {
x = xprime + xi + FIXP*(inw-1)/2;
y = yprime + yi + FIXP*(inh-1)/2;
if (fabs(rot->angle - 0) < FLT_EPSILON && outw == inw && outh == inh) {
simple_rotate(out->data[plane] + j * out->linesize[plane],
in->data[plane] + j * in->linesize[plane],
in->linesize[plane], 0, rot->draw.pixelstep[plane], outw);
} else if (fabs(rot->angle - M_PI/2) < FLT_EPSILON && outw == inh && outh == inw) {
simple_rotate(out->data[plane] + j * out->linesize[plane],
in->data[plane] + j * rot->draw.pixelstep[plane],
in->linesize[plane], 1, rot->draw.pixelstep[plane], outw);
} else if (fabs(rot->angle - M_PI) < FLT_EPSILON && outw == inw && outh == inh) {
simple_rotate(out->data[plane] + j * out->linesize[plane],
in->data[plane] + (outh-j-1) * in->linesize[plane],
in->linesize[plane], 2, rot->draw.pixelstep[plane], outw);
} else if (fabs(rot->angle - 3*M_PI/2) < FLT_EPSILON && outw == inh && outh == inw) {
simple_rotate(out->data[plane] + j * out->linesize[plane],
in->data[plane] + (outh-j-1) * rot->draw.pixelstep[plane],
in->linesize[plane], 3, rot->draw.pixelstep[plane], outw);
} else {
for (i = 0; i < outw; i++) {
int32_t v;
int x1, y1;
uint8_t *pin, *pout;
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->draw.pixelstep[plane];
if (rot->use_bilinear) {
pin = rot->interpolate_bilinear(inp_inv,
in->data[plane], in->linesize[plane], rot->draw.pixelstep[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->draw.pixelstep[plane];
}
switch (rot->draw.pixelstep[plane]) {
case 1:
*pout = *pin;
break;
case 2:
v = AV_RL16(pin);
AV_WL16(pout, v);
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->draw.pixelstep[plane]);
break;
}
}
x += c;
y -= s;
}
}
xprime += s;
yprime += c;
}
return 0;
}
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_out;
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 * 16;
s = int_sin(angle_int);
c = int_sin(angle_int + INT_PI/2);
/* fill background */
if (rot->fillcolor_enable)
ff_fill_rectangle(&rot->draw, &rot->color, out->data, out->linesize,
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;
const int outw = AV_CEIL_RSHIFT(outlink->w, hsub);
const int outh = AV_CEIL_RSHIFT(outlink->h, vsub);
ThreadData td = { .in = in, .out = out,
.inw = AV_CEIL_RSHIFT(inlink->w, hsub),
.inh = AV_CEIL_RSHIFT(inlink->h, vsub),
.outh = outh, .outw = outw,
.xi = -(outw-1) * c / 2, .yi = (outw-1) * s / 2,
.xprime = -(outh-1) * s / 2,
.yprime = -(outh-1) * c / 2,
.plane = plane, .c = c, .s = s };
ff_filter_execute(ctx, filter_slice, &td, NULL,
FFMIN(outh, ff_filter_get_nb_threads(ctx)));
}
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
char *res, int res_len, int flags)
{
RotContext *rot = ctx->priv;
int ret;
if (!strcmp(cmd, "angle") || !strcmp(cmd, "a")) {
AVExpr *old = rot->angle_expr;
ret = av_expr_parse(&rot->angle_expr, args, var_names,
NULL, NULL, NULL, NULL, 0, ctx);
if (ret < 0) {
av_log(ctx, AV_LOG_ERROR,
"Error when parsing the expression '%s' for angle command\n", args);
rot->angle_expr = old;
return ret;
}
av_expr_free(old);
} else
ret = AVERROR(ENOSYS);
return ret;
}
static const AVFilterPad rotate_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
};
static const AVFilterPad rotate_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_props,
},
};
const AVFilter ff_vf_rotate = {
.name = "rotate",
.description = NULL_IF_CONFIG_SMALL("Rotate the input image."),
.priv_size = sizeof(RotContext),
.init = init,
.uninit = uninit,
.process_command = process_command,
FILTER_INPUTS(rotate_inputs),
FILTER_OUTPUTS(rotate_outputs),
FILTER_QUERY_FUNC(query_formats),
.priv_class = &rotate_class,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
};
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