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/*
* Copyright (c) 2024 Michael Niedermayer <michael-ffmpeg@niedermayer.cc>
*
* 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 "config.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/cpu.h"
#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavcodec/bytestream.h"
#include "libswscale/swscale.h"
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
static void error(const char *err)
{
fprintf(stderr, "%s", err);
exit(1);
}
static int alloc_plane(uint8_t *data[AV_VIDEO_MAX_PLANES], int stride[AV_VIDEO_MAX_PLANES], int w, int h, int format, int *hshift, int *vshift)
{
size_t size[AV_VIDEO_MAX_PLANES];
ptrdiff_t ptrdiff_stride[AV_VIDEO_MAX_PLANES];
int ret = av_image_fill_linesizes(stride, format, w);
if (ret < 0)
return -1;
av_assert0(AV_VIDEO_MAX_PLANES == 4); // Some of the libavutil API has 4 hardcoded so this has undefined behaviour if its not 4
av_pix_fmt_get_chroma_sub_sample(format, hshift, vshift);
for(int p=0; p<AV_VIDEO_MAX_PLANES; p++) {
stride[p] =
ptrdiff_stride[p] = FFALIGN(stride[p], 32);
}
ret = av_image_fill_plane_sizes(size, format, h, ptrdiff_stride);
if (ret < 0)
return ret;
for(int p=0; p<AV_VIDEO_MAX_PLANES; p++) {
if (size[p]) {
data[p] = av_mallocz(size[p] + 32);
if (!data[p])
return -1;
} else
data[p] = NULL;
}
return 0;
}
static void free_plane(uint8_t *data[AV_VIDEO_MAX_PLANES])
{
for(int p=0; p<AV_VIDEO_MAX_PLANES; p++)
av_freep(&data[p]);
}
static void mapres(unsigned *r0, unsigned *r1) {
double d = (double)(*r0*10ll - 9ll*UINT32_MAX) / UINT32_MAX;
double a = exp(d) * 16384 / exp(1) ;
int ai = (int)round(a);
uint64_t maxb = 16384 / ai;
*r0 = ai;
*r1 = 1 + (*r1 * maxb) / UINT32_MAX;
}
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
int srcW= 48, srcH = 48;
int dstW= 48, dstH = 48;
int srcHShift, srcVShift;
int dstHShift, dstVShift;
unsigned flags = 1;
int srcStride[AV_VIDEO_MAX_PLANES] = {0};
int dstStride[AV_VIDEO_MAX_PLANES] = {0};
int ret;
const uint8_t *end = data + size;
enum AVPixelFormat srcFormat = AV_PIX_FMT_YUV420P;
enum AVPixelFormat dstFormat = AV_PIX_FMT_YUV420P;
uint8_t *src[AV_VIDEO_MAX_PLANES] = { 0 };
uint8_t *dst[AV_VIDEO_MAX_PLANES] = { 0 };
struct SwsContext *sws = NULL;
const AVPixFmtDescriptor *desc_src, *desc_dst;
if (size > 128) {
GetByteContext gbc;
int64_t flags64;
size -= 128;
bytestream2_init(&gbc, data + size, 128);
srcW = bytestream2_get_le32(&gbc);
srcH = bytestream2_get_le32(&gbc);
dstW = bytestream2_get_le32(&gbc);
dstH = bytestream2_get_le32(&gbc);
mapres(&srcW, &srcH);
mapres(&dstW, &dstH);
flags = bytestream2_get_le32(&gbc);
unsigned mask = flags & (SWS_POINT |
SWS_AREA |
SWS_BILINEAR |
SWS_FAST_BILINEAR |
SWS_BICUBIC |
SWS_X |
SWS_GAUSS |
SWS_LANCZOS |
SWS_SINC |
SWS_SPLINE |
SWS_BICUBLIN);
mask &= flags;
if (mask && (mask & (mask -1)))
return 0; // multiple scalers are set, not possible
srcFormat = bytestream2_get_le32(&gbc) % AV_PIX_FMT_NB;
dstFormat = bytestream2_get_le32(&gbc) % AV_PIX_FMT_NB;
flags64 = bytestream2_get_le64(&gbc);
if (flags64 & 0x10)
av_force_cpu_flags(0);
if (av_image_check_size(srcW, srcH, srcFormat, NULL) < 0)
srcW = srcH = 23;
if (av_image_check_size(dstW, dstH, dstFormat, NULL) < 0)
dstW = dstH = 23;
//TODO alphablend
}
desc_src = av_pix_fmt_desc_get(srcFormat);
desc_dst = av_pix_fmt_desc_get(dstFormat);
fprintf(stderr, "%d x %d %s -> %d x %d %s\n", srcW, srcH, desc_src->name, dstW, dstH, desc_dst->name);
ret = alloc_plane(src, srcStride, srcW, srcH, srcFormat, &srcHShift, &srcVShift);
if (ret < 0)
goto end;
ret = alloc_plane(dst, dstStride, dstW, dstH, dstFormat, &dstHShift, &dstVShift);
if (ret < 0)
goto end;
for(int p=0; p<AV_VIDEO_MAX_PLANES; p++) {
int psize = srcStride[p] * AV_CEIL_RSHIFT(srcH, (p == 1 || p == 2) ? srcVShift : 0);
if (psize > size)
psize = size;
if (psize) {
memcpy(src[p], data, psize);
data += psize;
size -= psize;
}
}
sws = sws_alloc_context();
if (!sws)
error("Failed sws allocation");
av_opt_set_int(sws, "sws_flags", flags, 0);
av_opt_set_int(sws, "srcw", srcW, 0);
av_opt_set_int(sws, "srch", srcH, 0);
av_opt_set_int(sws, "dstw", dstW, 0);
av_opt_set_int(sws, "dsth", dstH, 0);
av_opt_set_int(sws, "src_format", srcFormat, 0);
av_opt_set_int(sws, "dst_format", dstFormat, 0);
av_opt_set(sws, "alphablend", "none", 0);
ret = sws_init_context(sws, NULL, NULL);
if (ret < 0)
goto end;
//TODO Slices
sws_scale(sws, (const uint8_t * const*)src, srcStride, 0, srcH, dst, dstStride);
end:
sws_freeContext(sws);
free_plane(src);
free_plane(dst);
return 0;
}
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