stream_generator.h

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/*

 *  Copyright (c) 2013 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_VIDEO_CODING_DEPRECATED_STREAM_GENERATOR_H_

#define MODULES_VIDEO_CODING_DEPRECATED_STREAM_GENERATOR_H_

#include <stdint.h>

#include <list>

#include "modules/video_coding/deprecated/packet.h"

namespace webrtc {

const unsigned int kDefaultBitrateKbps = 1000;

const unsigned int kDefaultFrameRate = 25;

const unsigned int kMaxPacketSize = 1500;

const unsigned int kFrameSize =

    (kDefaultBitrateKbps + kDefaultFrameRate * 4) / (kDefaultFrameRate * 8);

const int kDefaultFramePeriodMs = 1000 / kDefaultFrameRate;

class StreamGenerator {

 public:

  StreamGenerator(uint16_t start_seq_num, int64_t current_time);

  StreamGenerator(const StreamGenerator&) = delete;

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

  void Init(uint16_t start_seq_num, int64_t current_time);

  // `time_ms` denotes the timestamp you want to put on the frame, and the unit

  // is millisecond. GenerateFrame will translate `time_ms` into a 90kHz

  // timestamp and put it on the frame.

  void GenerateFrame(VideoFrameType type,

                     int num_media_packets,

                     int num_empty_packets,

                     int64_t time_ms);

  bool PopPacket(VCMPacket* packet, int index);

  void DropLastPacket();

  bool GetPacket(VCMPacket* packet, int index);

  bool NextPacket(VCMPacket* packet);

  uint16_t NextSequenceNumber() const;

  int PacketsRemaining() const;

 private:

  VCMPacket GeneratePacket(uint16_t sequence_number,

                           uint32_t timestamp,

                           unsigned int size,

                           bool first_packet,

                           bool marker_bit,

                           VideoFrameType type);

  std::list<VCMPacket>::iterator GetPacketIterator(int index);

  std::list<VCMPacket> packets_;

  uint16_t sequence_number_;

  int64_t start_time_;

  uint8_t packet_buffer_[kMaxPacketSize];

};

}  // namespace webrtc

#endif  // MODULES_VIDEO_CODING_DEPRECATED_STREAM_GENERATOR_H_