constant_pcm_packet_source.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_NETEQ_TOOLS_CONSTANT_PCM_PACKET_SOURCE_H_

#define MODULES_AUDIO_CODING_NETEQ_TOOLS_CONSTANT_PCM_PACKET_SOURCE_H_

#include <stdio.h>

#include <string>

#include "modules/audio_coding/neteq/tools/packet_source.h"

namespace webrtc {

namespace test {

// This class implements a packet source that delivers PCM16b encoded packets

// with a constant sample value. The payload length, constant sample value,

// sample rate, and payload type are all set in the constructor.

class ConstantPcmPacketSource : public PacketSource {

 public:

  ConstantPcmPacketSource(size_t payload_len_samples,

                          int16_t sample_value,

                          int sample_rate_hz,

                          int payload_type);

  ConstantPcmPacketSource(const ConstantPcmPacketSource&) = delete;

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

  std::unique_ptr<Packet> NextPacket() override;

 private:

  void WriteHeader(uint8_t* packet_memory);

  const size_t kHeaderLenBytes = 12;

  const size_t payload_len_samples_;

  const size_t packet_len_bytes_;

  uint8_t encoded_sample_[2];

  const int samples_per_ms_;

  double next_arrival_time_ms_;

  const int payload_type_;

  uint16_t seq_number_;

  uint32_t timestamp_;

  const uint32_t payload_ssrc_;

};

}  // namespace test

}  // namespace webrtc

#endif  // MODULES_AUDIO_CODING_NETEQ_TOOLS_CONSTANT_PCM_PACKET_SOURCE_H_