1 /*
2 * Copyright (c) 2019, Alliance for Open Media. All rights reserved.
3 *
4 * This source code is subject to the terms of the BSD 2 Clause License and
5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
6 * was not distributed with this source code in the LICENSE file, you can
7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
8 * Media Patent License 1.0 was not distributed with this source code in the
9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
10 */
11
12 /*
13 * See build_av1_dec_fuzzer.sh for building instructions.
14 */
15
16 #include <stddef.h>
17 #include <stdint.h>
18 #include <stdio.h>
19 #include <stdlib.h>
20 #include <algorithm>
21 #include <memory>
22 #include "config/aom_config.h"
23 #include "aom/aom_decoder.h"
24 #include "aom/aomdx.h"
25 #include "aom_ports/mem_ops.h"
26
27 #define IVF_FRAME_HDR_SZ (4 + 8) /* 4 byte size + 8 byte timestamp */
28 #define IVF_FILE_HDR_SZ 32
29
usage_exit(void)30 extern "C" void usage_exit(void) { exit(EXIT_FAILURE); }
31
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)32 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
33 if (size <= IVF_FILE_HDR_SZ) {
34 return 0;
35 }
36
37 // Abusing the four unused bytes at the end of the IVF file header as a source
38 // of random bits.
39 unsigned int tile_mode = (data[IVF_FILE_HDR_SZ - 1] & 2) != 0;
40 unsigned int ext_tile_debug = (data[IVF_FILE_HDR_SZ - 1] & 4) != 0;
41 unsigned int is_annexb = (data[IVF_FILE_HDR_SZ - 1] & 8) != 0;
42 int output_all_layers = (data[IVF_FILE_HDR_SZ - 1] & 0x10) != 0;
43 int operating_point = data[IVF_FILE_HDR_SZ - 2] & 0x1F;
44
45 aom_codec_iface_t *codec_interface = aom_codec_av1_dx();
46 aom_codec_ctx_t codec;
47 // Set thread count in the range [1, 64].
48 const unsigned int threads = (data[IVF_FILE_HDR_SZ] & 0x3f) + 1;
49 aom_codec_dec_cfg_t cfg = { threads, 0, 0, !FORCE_HIGHBITDEPTH_DECODING };
50 if (aom_codec_dec_init(&codec, codec_interface, &cfg, 0)) {
51 return 0;
52 }
53 AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1_SET_TILE_MODE, tile_mode);
54 AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_EXT_TILE_DEBUG, ext_tile_debug);
55 AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_SET_IS_ANNEXB, is_annexb);
56 AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_SET_OUTPUT_ALL_LAYERS,
57 output_all_layers);
58 AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_SET_OPERATING_POINT,
59 operating_point);
60
61 data += IVF_FILE_HDR_SZ;
62 size -= IVF_FILE_HDR_SZ;
63
64 while (size > IVF_FRAME_HDR_SZ) {
65 size_t frame_size = mem_get_le32(data);
66 size -= IVF_FRAME_HDR_SZ;
67 data += IVF_FRAME_HDR_SZ;
68 frame_size = std::min(size, frame_size);
69
70 aom_codec_stream_info_t stream_info;
71 stream_info.is_annexb = is_annexb;
72 aom_codec_err_t err =
73 aom_codec_peek_stream_info(codec_interface, data, size, &stream_info);
74 static_cast<void>(err);
75
76 err = aom_codec_decode(&codec, data, frame_size, nullptr);
77 static_cast<void>(err);
78 aom_codec_iter_t iter = nullptr;
79 aom_image_t *img = nullptr;
80 while ((img = aom_codec_get_frame(&codec, &iter)) != nullptr) {
81 }
82 data += frame_size;
83 size -= frame_size;
84 }
85 aom_codec_destroy(&codec);
86 return 0;
87 }
88