audio_encoder_ilbc.h

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/*

 *  Copyright (c) 2014 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_ILBC_AUDIO_ENCODER_ILBC_H_

#define MODULES_AUDIO_CODING_CODECS_ILBC_AUDIO_ENCODER_ILBC_H_

#include <stddef.h>

#include <stdint.h>

#include <utility>

#include "absl/types/optional.h"

#include "api/audio_codecs/audio_encoder.h"

#include "api/audio_codecs/ilbc/audio_encoder_ilbc_config.h"

#include "api/units/time_delta.h"

#include "modules/audio_coding/codecs/ilbc/ilbc.h"

namespace webrtc {

class AudioEncoderIlbcImpl final : public AudioEncoder {

 public:

  AudioEncoderIlbcImpl(const AudioEncoderIlbcConfig& config, int payload_type);

  ~AudioEncoderIlbcImpl() override;

  AudioEncoderIlbcImpl(const AudioEncoderIlbcImpl&) = delete;

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

  int SampleRateHz() const override;

  size_t NumChannels() const override;

  size_t Num10MsFramesInNextPacket() const override;

  size_t Max10MsFramesInAPacket() const override;

  int GetTargetBitrate() const override;

  EncodedInfo EncodeImpl(uint32_t rtp_timestamp,

                         rtc::ArrayView<const int16_t> audio,

                         rtc::Buffer* encoded) override;

  void Reset() override;

  absl::optional<std::pair<TimeDelta, TimeDelta>> GetFrameLengthRange()

      const override;

 private:

  size_t RequiredOutputSizeBytes() const;

  static constexpr size_t kMaxSamplesPerPacket = 480;

  const int frame_size_ms_;

  const int payload_type_;

  const size_t num_10ms_frames_per_packet_;

  size_t num_10ms_frames_buffered_;

  uint32_t first_timestamp_in_buffer_;

  int16_t input_buffer_[kMaxSamplesPerPacket];

  IlbcEncoderInstance* encoder_;

};

}  // namespace webrtc

#endif  // MODULES_AUDIO_CODING_CODECS_ILBC_AUDIO_ENCODER_ILBC_H_