// Copyright 2021 Google LLC

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//      http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#include <fuzzer/FuzzedDataProvider.h>

#include <stdint.h>

#include <stdlib.h>

#include <string.h>

#include "opus.h"

#include "opus_types.h"

#include "opus_defines.h"

#define MAX_PACKET (1500)

#define SAMPLES (48000 * 10)

#define MAX_FRAME_SAMP (5760)

static const int sampling_rates[] = {8000, 12000, 16000, 24000, 48000};

static const int channels[] = {1, 2};

static const int applications[] = {OPUS_APPLICATION_AUDIO,

                                   OPUS_APPLICATION_VOIP,

                                   OPUS_APPLICATION_RESTRICTED_LOWDELAY};

static const int frame_sizes_ms_x2[] = {5, 10, 20, 40, 80, 120, 160, 200, 240};

static opus_int16 inbuf[sizeof(opus_int16) * SAMPLES] = {0};

static unsigned char packet[MAX_PACKET + 257];

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {

  FuzzedDataProvider fdp(data, size);

  int err = OPUS_OK;

  int num_channels = fdp.PickValueInArray(channels);

  int frame_size = fdp.PickValueInArray(frame_sizes_ms_x2);

  int sampling_rate = fdp.PickValueInArray(sampling_rates);

  int application = fdp.PickValueInArray(applications);

  OpusEncoder *enc =

      opus_encoder_create(sampling_rate, num_channels, application, &err);

  if (err != OPUS_OK || enc == NULL) {

    opus_encoder_destroy(enc);

    return 0;

  }

  opus_encoder_ctl(enc, OPUS_SET_COMPLEXITY(fdp.ConsumeIntegralInRange(0, 10)));

  opus_encoder_ctl(enc, OPUS_SET_VBR(fdp.ConsumeBool()));

  opus_encoder_ctl(enc, OPUS_SET_VBR_CONSTRAINT(fdp.ConsumeBool()));

  opus_encoder_ctl(

      enc, OPUS_SET_FORCE_CHANNELS(fdp.PickValueInArray({OPUS_AUTO, 1, 2})));

  opus_encoder_ctl(enc,

                   OPUS_SET_MAX_BANDWIDTH(fdp.PickValueInArray(

                       {OPUS_BANDWIDTH_NARROWBAND, OPUS_BANDWIDTH_MEDIUMBAND,

                        OPUS_BANDWIDTH_WIDEBAND, OPUS_BANDWIDTH_SUPERWIDEBAND,

                        OPUS_BANDWIDTH_FULLBAND})));

  opus_encoder_ctl(enc, OPUS_SET_INBAND_FEC(fdp.ConsumeBool()));

  opus_encoder_ctl(

      enc, OPUS_SET_PACKET_LOSS_PERC(fdp.ConsumeIntegralInRange(0, 100)));

  opus_encoder_ctl(enc, OPUS_SET_DTX(fdp.ConsumeBool()));

  opus_encoder_ctl(enc, OPUS_SET_LSB_DEPTH(fdp.ConsumeIntegralInRange(8, 24)));

  opus_encoder_ctl(enc, OPUS_SET_PREDICTION_DISABLED((fdp.ConsumeBool())));

  opus_encoder_ctl(enc,

                   OPUS_SET_SIGNAL(fdp.PickValueInArray(

                       {OPUS_AUTO, OPUS_SIGNAL_VOICE, OPUS_SIGNAL_MUSIC})));

  opus_encoder_ctl(enc,

                   OPUS_SET_PHASE_INVERSION_DISABLED(((fdp.ConsumeBool()))));

  fdp.ConsumeData(inbuf, sizeof(inbuf));

  size_t samp_count = 0;

  do {

    const int frame_size_samples = frame_size * sampling_rate / 2000;

    const int len = opus_encode(enc, &inbuf[samp_count * num_channels],

                                frame_size_samples, packet, MAX_PACKET);

    if (len < 0 || len > MAX_PACKET) {

      break;

    }

    samp_count += frame_size;

  } while (samp_count < ((SAMPLES / 2) - MAX_FRAME_SAMP));

  opus_encoder_destroy(enc);

  return 0;

}