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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
*
* Based on target_dec_fuzzer
*/
#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 "libavcodec/avcodec.h"
#include "libavcodec/bytestream.h"
#include "libavcodec/codec_internal.h"
#include "libavformat/avformat.h"
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
extern const FFCodec * codec_list[];
static void error(const char *err)
{
fprintf(stderr, "%s", err);
exit(1);
}
static const FFCodec *c = NULL;
// Ensure we don't loop forever
const uint32_t maxiteration = 8096;
static int encode(AVCodecContext *enc_ctx, AVFrame *frame, AVPacket *pkt)
{
int ret;
ret = avcodec_send_frame(enc_ctx, frame);
if (ret < 0)
return ret;
while (ret >= 0) {
ret = avcodec_receive_packet(enc_ctx, pkt);
if (ret == AVERROR(EAGAIN)) {
return 0;
} else if (ret < 0) {
return ret;
}
av_packet_unref(pkt);
}
av_assert0(0);
}
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
uint64_t maxpixels_per_frame = 512 * 512;
uint64_t maxpixels;
const uint8_t *end = data + size;
uint32_t it = 0;
uint64_t nb_samples = 0;
AVDictionary *opts = NULL;
if (!c) {
#define ENCODER_SYMBOL0(CODEC) ff_##CODEC##_encoder
#define ENCODER_SYMBOL(CODEC) ENCODER_SYMBOL0(CODEC)
extern FFCodec ENCODER_SYMBOL(FFMPEG_ENCODER);
codec_list[0] = &ENCODER_SYMBOL(FFMPEG_ENCODER);
c = &ENCODER_SYMBOL(FFMPEG_ENCODER);
av_log_set_level(AV_LOG_PANIC);
}
av_assert0(c->p.type == AVMEDIA_TYPE_VIDEO);
maxpixels = maxpixels_per_frame * maxiteration;
maxpixels_per_frame = FFMIN(maxpixels_per_frame , maxpixels);
AVCodecContext* ctx = avcodec_alloc_context3(&c->p);
if (!ctx)
error("Failed memory allocation");
if (ctx->max_pixels == 0 || ctx->max_pixels > maxpixels_per_frame)
ctx->max_pixels = maxpixels_per_frame; //To reduce false positive OOM and hangs
ctx->pix_fmt = AV_PIX_FMT_YUV420P;
if (size > 1024) {
GetByteContext gbc;
int flags;
int64_t flags64;
size -= 1024;
bytestream2_init(&gbc, data + size, 1024);
ctx->width = bytestream2_get_le32(&gbc) & 0xFFFF;
ctx->height = bytestream2_get_le32(&gbc) & 0xFFFF;
ctx->bit_rate = bytestream2_get_le64(&gbc);
ctx->gop_size = bytestream2_get_le32(&gbc) & 0x7FFFFFFF;
ctx->max_b_frames = bytestream2_get_le32(&gbc) & 0x7FFFFFFF;
ctx->time_base.num = bytestream2_get_le32(&gbc) & 0x7FFFFFFF;
ctx->time_base.den = bytestream2_get_le32(&gbc) & 0x7FFFFFFF;
ctx->framerate.num = bytestream2_get_le32(&gbc) & 0x7FFFFFFF;
ctx->framerate.den = bytestream2_get_le32(&gbc) & 0x7FFFFFFF;
flags = bytestream2_get_byte(&gbc);
if (flags & 2)
ctx->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL;
if (flags & 0x40)
av_force_cpu_flags(0);
flags64 = bytestream2_get_le64(&gbc);
int npixfmts = 0;
while (c->p.pix_fmts[npixfmts++] != AV_PIX_FMT_NONE)
;
ctx->pix_fmt = c->p.pix_fmts[bytestream2_get_byte(&gbc) % npixfmts];
switch (c->p.id) {
case AV_CODEC_ID_FFV1:{
int coder = bytestream2_get_byte(&gbc)&3;
if (coder == 3) coder = -2;
av_dict_set_int(&opts, "coder", coder, 0);
av_dict_set_int(&opts, "context", bytestream2_get_byte(&gbc)&1, 0);
av_dict_set_int(&opts, "slicecrc", bytestream2_get_byte(&gbc)&1, 0);
break;}
}
}
if (ctx->width == 0 || av_image_check_size(ctx->width, ctx->height, 0, ctx))
ctx->width = ctx->height = 64;
int res = avcodec_open2(ctx, &c->p, &opts);
if (res < 0) {
avcodec_free_context(&ctx);
av_dict_free(&opts);
return 0; // Failure of avcodec_open2() does not imply that a issue was found
}
AVFrame *frame = av_frame_alloc();
AVPacket *avpkt = av_packet_alloc();
if (!frame || !avpkt)
error("Failed memory allocation");
frame->format = ctx->pix_fmt;
frame->width = ctx->width;
frame->height = ctx->height;
while (data < end && it < maxiteration) {
res = av_frame_get_buffer(frame, 0);
if (res < 0)
error("Failed av_frame_get_buffer");
for (int i=0; i<FF_ARRAY_ELEMS(frame->buf); i++) {
if (frame->buf[i]) {
int buf_size = FFMIN(end-data, frame->buf[i]->size);
memcpy(frame->buf[i]->data, data, buf_size);
memset(frame->buf[i]->data + buf_size, 0, frame->buf[i]->size - buf_size);
data += buf_size;
}
}
frame->pts = nb_samples;
res = encode(ctx, frame, avpkt);
if (res < 0)
break;
it++;
for (int i=0; i<FF_ARRAY_ELEMS(frame->buf); i++)
av_buffer_unref(&frame->buf[i]);
av_packet_unref(avpkt);
}
encode(ctx, NULL, avpkt);
av_packet_unref(avpkt);
// fprintf(stderr, "frames encoded: %"PRId64", iterations: %d\n", nb_samples , it);
av_frame_free(&frame);
avcodec_free_context(&ctx);
av_packet_free(&avpkt);
av_dict_free(&opts);
return 0;
}
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