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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This is the main interface for the cast transport sender. It accepts encoded
// frames (both audio and video), encrypts their encoded data, packetizes them
// and feeds them into a transport (e.g., UDP).
// Construction of the Cast Sender and the Cast Transport should be done
// in the following order:
// 1. Create CastTransport.
// 2. Create CastSender (accepts CastTransport as an input).
// Destruction: The CastTransport is assumed to be valid as long as the
// CastSender is alive. Therefore the CastSender should be destructed before the
// CastTransport.
#ifndef MEDIA_CAST_NET_CAST_TRANSPORT_H_
#define MEDIA_CAST_NET_CAST_TRANSPORT_H_
#include <stdint.h>
#include <memory>
#include "base/callback.h"
#include "base/single_thread_task_runner.h"
#include "base/threading/non_thread_safe.h"
#include "base/time/tick_clock.h"
#include "base/values.h"
#include "media/cast/logging/logging_defines.h"
#include "media/cast/net/cast_transport_config.h"
#include "media/cast/net/cast_transport_defines.h"
#include "media/cast/net/rtcp/receiver_rtcp_event_subscriber.h"
#include "media/cast/net/rtcp/rtcp_defines.h"
#include "net/base/ip_endpoint.h"
namespace base {
class DictionaryValue;
} // namespace base
namespace net {
class NetLog;
} // namespace net
namespace media {
namespace cast {
struct RtpReceiverStatistics;
struct RtcpTimeData;
// Following the initialization of either audio or video an initialization
// status will be sent via this callback.
using CastTransportStatusCallback =
base::Callback<void(CastTransportStatus status)>;
using BulkRawEventsCallback =
base::Callback<void(std::unique_ptr<std::vector<FrameEvent>>,
std::unique_ptr<std::vector<PacketEvent>>)>;
// Interface to handle received RTCP messages on RTP sender.
class RtcpObserver {
public:
virtual ~RtcpObserver() {}
// Called on receiving cast message from RTP receiver.
virtual void OnReceivedCastMessage(const RtcpCastMessage& cast_message) = 0;
// Called on receiving Rtt message from RTP receiver.
virtual void OnReceivedRtt(base::TimeDelta round_trip_time) = 0;
// Called on receiving PLI from RTP receiver.
virtual void OnReceivedPli() = 0;
// Called on receiving RTP receiver logs.
virtual void OnReceivedReceiverLog(const RtcpReceiverLogMessage& log) {}
};
// The application should only trigger this class from the transport thread.
class CastTransport : public base::NonThreadSafe {
public:
// Interface used for receiving status updates, raw events, and RTP packets
// from CastTransport.
class Client {
public:
virtual ~Client(){};
// Audio and Video transport status change is reported on this callback.
virtual void OnStatusChanged(CastTransportStatus status) = 0;
// Raw events will be invoked on this callback periodically, according to
// the configured logging flush interval passed to
// CastTransport::Create().
virtual void OnLoggingEventsReceived(
std::unique_ptr<std::vector<FrameEvent>> frame_events,
std::unique_ptr<std::vector<PacketEvent>> packet_events) = 0;
// Called to pass RTP packets to the Client.
virtual void ProcessRtpPacket(std::unique_ptr<Packet> packet) = 0;
};
static std::unique_ptr<CastTransport> Create(
base::TickClock* clock, // Owned by the caller.
base::TimeDelta logging_flush_interval,
std::unique_ptr<Client> client,
std::unique_ptr<PacketTransport> transport,
const scoped_refptr<base::SingleThreadTaskRunner>& transport_task_runner);
virtual ~CastTransport() {}
// Audio/Video initialization.
// Encoded frames cannot be transmitted until the relevant initialize method
// is called.
virtual void InitializeStream(const CastTransportRtpConfig& config,
std::unique_ptr<RtcpObserver> rtcp_observer) {}
// Encrypt, packetize and transmit |frame|. |ssrc| must refer to a
// a channel already established with InitializeAudio / InitializeVideo.
virtual void InsertFrame(uint32_t ssrc, const EncodedFrame& frame) = 0;
// Sends a RTCP sender report to the receiver.
// |ssrc| is the SSRC for this report.
// |current_time| is the current time reported by a tick clock.
// |current_time_as_rtp_timestamp| is the corresponding RTP timestamp.
virtual void SendSenderReport(uint32_t ssrc,
base::TimeTicks current_time,
RtpTimeTicks current_time_as_rtp_timestamp) = 0;
// Cancels sending packets for the frames in the set.
// |ssrc| is the SSRC for the stream.
// |frame_ids| contains the IDs of the frames that will be cancelled.
virtual void CancelSendingFrames(uint32_t ssrc,
const std::vector<FrameId>& frame_ids) = 0;
// Resends a frame or part of a frame to kickstart. This is used when the
// stream appears to be stalled.
virtual void ResendFrameForKickstart(uint32_t ssrc, FrameId frame_id) = 0;
// Returns a callback for receiving packets for testing purposes.
virtual PacketReceiverCallback PacketReceiverForTesting();
// The following functions are needed for receving.
// The RTP sender SSRC is used to verify that incoming packets come from the
// right sender. Without valid SSRCs, the return address cannot be
// automatically established. The RTP receiver SSRC is used to verify that the
// request to build the RTCP packet is from the right RTP receiver.
virtual void AddValidRtpReceiver(uint32_t rtp_sender_ssrc,
uint32_t rtp_receiver_ssrc) = 0;
// The following function are used to build and send a RTCP packet from
// RTP receiver to RTP sender.
// Initialize the RTCP builder on RTP receiver. This has to be called before
// adding other optional RTCP messages to the packet.
virtual void InitializeRtpReceiverRtcpBuilder(
uint32_t rtp_receiver_ssrc,
const RtcpTimeData& time_data) = 0;
virtual void AddCastFeedback(const RtcpCastMessage& cast_message,
base::TimeDelta target_delay) = 0;
virtual void AddPli(const RtcpPliMessage& pli_message) = 0;
virtual void AddRtcpEvents(
const ReceiverRtcpEventSubscriber::RtcpEvents& rtcp_events) = 0;
virtual void AddRtpReceiverReport(
const RtcpReportBlock& rtp_report_block) = 0;
// Finalize the building of the RTCP packet and send out the built packet.
virtual void SendRtcpFromRtpReceiver() = 0;
// Set options for the PacedSender and Wifi.
virtual void SetOptions(const base::DictionaryValue& options) = 0;
};
} // namespace cast
} // namespace media
#endif // MEDIA_CAST_NET_CAST_TRANSPORT_H_