audio_decoder_opus.h

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/*

 *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.

 *  Use of this source code is governed by a BSD-style license

 *  that can be found in the LICENSE file in the root of the source

 *  tree. An additional intellectual property rights grant can be found

 *  in the file PATENTS.  All contributing project authors may

 *  be found in the AUTHORS file in the root of the source tree.

*/

#ifndef MODULES_AUDIO_CODING_CODECS_OPUS_AUDIO_DECODER_OPUS_H_

#define MODULES_AUDIO_CODING_CODECS_OPUS_AUDIO_DECODER_OPUS_H_

#include <stddef.h>

#include <stdint.h>

#include <vector>

#include "api/audio_codecs/audio_decoder.h"

#include "api/field_trials_view.h"

#include "modules/audio_coding/codecs/opus/opus_interface.h"

#include "rtc_base/buffer.h"

namespace webrtc {

class AudioDecoderOpusImpl final : public AudioDecoder {

 public:

  explicit AudioDecoderOpusImpl(const FieldTrialsView& field_trails,

                                size_t num_channels,

                                int sample_rate_hz);

  ~AudioDecoderOpusImpl() override;

  AudioDecoderOpusImpl(const AudioDecoderOpusImpl&) = delete;

  AudioDecoderOpusImpl& operator=(const AudioDecoderOpusImpl&) = delete;

  std::vector<ParseResult> ParsePayload(rtc::Buffer&& payload,

                                        uint32_t timestamp) override;

  void Reset() override;

  int PacketDuration(const uint8_t* encoded, size_t encoded_len) const override;

  int PacketDurationRedundant(const uint8_t* encoded,

                              size_t encoded_len) const override;

  bool PacketHasFec(const uint8_t* encoded, size_t encoded_len) const override;

  int SampleRateHz() const override;

  size_t Channels() const override;

  void GeneratePlc(size_t requested_samples_per_channel,

                   rtc::BufferT<int16_t>* concealment_audio) override;

 protected:

  int DecodeInternal(const uint8_t* encoded,

                     size_t encoded_len,

                     int sample_rate_hz,

                     int16_t* decoded,

                     SpeechType* speech_type) override;

  int DecodeRedundantInternal(const uint8_t* encoded,

                              size_t encoded_len,

                              int sample_rate_hz,

                              int16_t* decoded,

                              SpeechType* speech_type) override;

 private:

  OpusDecInst* dec_state_;

  const size_t channels_;

  const int sample_rate_hz_;

  const bool generate_plc_;

};

}  // namespace webrtc

#endif  // MODULES_AUDIO_CODING_CODECS_OPUS_AUDIO_DECODER_OPUS_H_