av1_dec_fuzzer.cc (3134B)
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 30 extern "C" void usage_exit(void) { exit(EXIT_FAILURE); } 31 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 }