call/call.h

/*
 *  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 CALL_CALL_H_
#define CALL_CALL_H_

#include <algorithm>
#include <memory>
#include <string>
#include <vector>

#include "call/audio_receive_stream.h"
#include "call/audio_send_stream.h"
#include "call/call_config.h"
#include "call/flexfec_receive_stream.h"
#include "call/rtp_transport_controller_send_interface.h"
#include "call/video_receive_stream.h"
#include "call/video_send_stream.h"
#include "common_types.h"  // NOLINT(build/include)
#include "rtc_base/bitrateallocationstrategy.h"
#include "rtc_base/copyonwritebuffer.h"
#include "rtc_base/networkroute.h"
#include "rtc_base/socket.h"

namespace webrtc {

enum class MediaType {
  ANY,
  AUDIO,
  VIDEO,
  DATA
};

class PacketReceiver {
 public:
  enum DeliveryStatus {
    DELIVERY_OK,
    DELIVERY_UNKNOWN_SSRC,
    DELIVERY_PACKET_ERROR,
  };

  virtual DeliveryStatus DeliverPacket(MediaType media_type,
                                       rtc::CopyOnWriteBuffer packet,
                                       const PacketTime& packet_time) = 0;

 protected:
  virtual ~PacketReceiver() {}
};

// A Call instance can contain several send and/or receive streams. All streams
// are assumed to have the same remote endpoint and will share bitrate estimates
// etc.
class Call {
 public:
  using Config = CallConfig;

  struct Stats {
    std::string ToString(int64_t time_ms) const;

    int send_bandwidth_bps = 0;       // Estimated available send bandwidth.
    int max_padding_bitrate_bps = 0;  // Cumulative configured max padding.
    int recv_bandwidth_bps = 0;       // Estimated available receive bandwidth.
    int64_t pacer_delay_ms = 0;
    int64_t rtt_ms = -1;
  };

  static Call* Create(const Call::Config& config);

  // Allows mocking |transport_send| for testing.
  static Call* Create(
      const Call::Config& config,
      std::unique_ptr<RtpTransportControllerSendInterface> transport_send);

  virtual AudioSendStream* CreateAudioSendStream(
      const AudioSendStream::Config& config) = 0;
  virtual void DestroyAudioSendStream(AudioSendStream* send_stream) = 0;

  virtual AudioReceiveStream* CreateAudioReceiveStream(
      const AudioReceiveStream::Config& config) = 0;
  virtual void DestroyAudioReceiveStream(
      AudioReceiveStream* receive_stream) = 0;

  virtual VideoSendStream* CreateVideoSendStream(
      VideoSendStream::Config config,
      VideoEncoderConfig encoder_config) = 0;
  virtual VideoSendStream* CreateVideoSendStream(
      VideoSendStream::Config config,
      VideoEncoderConfig encoder_config,
      std::unique_ptr<FecController> fec_controller);
  virtual void DestroyVideoSendStream(VideoSendStream* send_stream) = 0;

  virtual VideoReceiveStream* CreateVideoReceiveStream(
      VideoReceiveStream::Config configuration) = 0;
  virtual void DestroyVideoReceiveStream(
      VideoReceiveStream* receive_stream) = 0;

  // In order for a created VideoReceiveStream to be aware that it is
  // protected by a FlexfecReceiveStream, the latter should be created before
  // the former.
  virtual FlexfecReceiveStream* CreateFlexfecReceiveStream(
      const FlexfecReceiveStream::Config& config) = 0;
  virtual void DestroyFlexfecReceiveStream(
      FlexfecReceiveStream* receive_stream) = 0;

  // All received RTP and RTCP packets for the call should be inserted to this
  // PacketReceiver. The PacketReceiver pointer is valid as long as the
  // Call instance exists.
  virtual PacketReceiver* Receiver() = 0;

  // This is used to access the transport controller send instance owned by
  // Call. The send transport controller is currently owned by Call for legacy
  // reasons. (for instance  variants of call tests are built on this assumtion)
  // TODO(srte): Move ownership of transport controller send out of Call and
  // remove this method interface.
  virtual RtpTransportControllerSendInterface* GetTransportControllerSend() = 0;

  // Returns the call statistics, such as estimated send and receive bandwidth,
  // pacing delay, etc.
  virtual Stats GetStats() const = 0;

  virtual void SetBitrateAllocationStrategy(
      std::unique_ptr<rtc::BitrateAllocationStrategy>
          bitrate_allocation_strategy) = 0;

  // TODO(skvlad): When the unbundled case with multiple streams for the same
  // media type going over different networks is supported, track the state
  // for each stream separately. Right now it's global per media type.
  virtual void SignalChannelNetworkState(MediaType media,
                                         NetworkState state) = 0;

  virtual void OnTransportOverheadChanged(
      MediaType media,
      int transport_overhead_per_packet) = 0;

  virtual void OnSentPacket(const rtc::SentPacket& sent_packet) = 0;

  virtual ~Call() {}
};

}  // namespace webrtc

#endif  // CALL_CALL_H_