third_party/aom/examples/av1_dec_fuzzer.cc

   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     const aom_codec_err_t err =
  71         aom_codec_decode(&codec, data, frame_size, nullptr);
  72     static_cast<void>(err);
  73     aom_codec_iter_t iter = nullptr;
  74     aom_image_t *img = nullptr;
  75     while ((img = aom_codec_get_frame(&codec, &iter)) != nullptr) {
  76     }
  77     data += frame_size;
  78     size -= frame_size;
  79   }
  80   aom_codec_destroy(&codec);
  81   return 0;
  82 }