// Fuzzing of AV1 decoder.

#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#if defined(DECODE_MODE_threaded)
#include <algorithm>
#endif
#include <memory>

#include "config/aom_config.h"
#include "aom/aom_decoder.h"
#include "aom/aomdx.h"
#include "aom_ports/mem_ops.h"
#include "common/ivfdec.h"

static void close_file(FILE *file) { fclose(file); }

extern "C" void usage_exit(void) { exit(EXIT_FAILURE); }

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
  std::unique_ptr<FILE, decltype(&close_file)> file(
      fmemopen((void *)data, size, "rb"), &close_file);
  if (file == nullptr) {
    return 0;
  }

  char header[32];
  if (fread(header, 1, 32, file.get()) != 32) {
    return 0;
  }
  const AvxInterface *decoder = get_aom_decoder_by_name("av1");
  if (decoder == nullptr) {
    return 0;
  }

  aom_codec_ctx_t codec;
#if defined(DECODE_MODE)
  const unsigned int threads = 1;
#elif defined(DECODE_MODE_threaded)
  // Set thread count in the range [2, 64].
  const unsigned int threads = std::max((header[0] & 0x3f) + 1, 2);
#else
#error define one of DECODE_MODE or DECODE_MODE_threaded
#endif
  aom_codec_dec_cfg_t cfg = {threads, 0, 0, CONFIG_LOWBITDEPTH};
  if (aom_codec_dec_init(&codec, decoder->codec_interface(), &cfg, 0)) {
    return 0;
  }

  uint8_t *buffer = nullptr;
  size_t buffer_size = 0;
  size_t frame_size = 0;
  while (!ivf_read_frame(file.get(), &buffer, &frame_size, &buffer_size,
                         nullptr)) {
    const aom_codec_err_t err =
        aom_codec_decode(&codec, buffer, frame_size, nullptr);
    static_cast<void>(err);
    aom_codec_iter_t iter = nullptr;
    aom_image_t *img = nullptr;
    while ((img = aom_codec_get_frame(&codec, &iter)) != nullptr) {
    }
  }
  aom_codec_destroy(&codec);
  free(buffer);
  return 0;
}