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FFmpeg/libavfilter/vf_shear.c
Nil Fons Miret 9899da8175 libavfilter: guard against ff_draw_init/ff_draw_init2 failures 
The return value of ff_draw_init and ff_draw_init2 are not checked in
most usages. However, if they return an error, they don't get to the
point where they set the attributes of the FFDrawContext. These
functions are typically used in conjunction with ff_draw_color, which
checks draw->desc->flags, causing a null pointer dereference.

Signed-off-by: Nil Fons Miret <nilf@netflix.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2025-03-11 14:17:01 +01:00

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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 "filters.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, .unit = "interp" },
{ "nearest", "nearest neighbour", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, .flags=FLAGS, .unit = "interp" },
{ "bilinear", "bilinear", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, .flags=FLAGS, .unit = "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);
int ret;
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;
ret = ff_draw_init2(&s->draw, outlink->format, outlink->colorspace, outlink->color_range, 0);
if (ret < 0) {
av_log(ctx, AV_LOG_ERROR, "Failed to initialize FFDrawContext\n");
return ret;
}
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 FFFilter ff_vf_shear = {
.p.name = "shear",
.p.description = NULL_IF_CONFIG_SMALL("Shear transform the input image."),
.p.priv_class = &shear_class,
.p.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
.priv_size = sizeof(ShearContext),
.init = init,
FILTER_INPUTS(inputs),
FILTER_OUTPUTS(outputs),
FILTER_PIXFMTS_ARRAY(pix_fmts),
.process_command = process_command,
};
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