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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.
#ifndef MEDIA_CAST_NET_UDP_TRANSPORT_H_
#define MEDIA_CAST_NET_UDP_TRANSPORT_H_
#include <stdint.h>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/values.h"
#include "build/build_config.h"
#include "media/cast/cast_environment.h"
#include "media/cast/net/cast_transport_config.h"
#include "media/cast/net/cast_transport_sender.h"
#include "media/cast/net/pacing/paced_sender.h"
#include "net/base/io_buffer.h"
#include "net/base/ip_endpoint.h"
#include "net/udp/diff_serv_code_point.h"
#include "net/udp/udp_socket.h"
namespace net {
class NetLog;
} // namespace net
namespace media {
namespace cast {
// This class implements UDP transport mechanism for Cast.
class UdpTransport : public PacketSender {
public:
// Construct a UDP transport.
// All methods must be called on |io_thread_proxy|.
// |local_end_point| specifies the address and port to bind and listen
// to incoming packets. If the value is 0.0.0.0:0 then a bind is not
// performed.
// |remote_end_point| specifies the address and port to send packets
// to. If the value is 0.0.0.0:0 the the end point is set to the source
// address of the first packet received.
// |send_buffer_size| specifies the size of the socket send buffer.
UdpTransport(
net::NetLog* net_log,
const scoped_refptr<base::SingleThreadTaskRunner>& io_thread_proxy,
const net::IPEndPoint& local_end_point,
const net::IPEndPoint& remote_end_point,
const CastTransportStatusCallback& status_callback);
~UdpTransport() final;
// Start receiving packets. Packets are submitted to |packet_receiver|.
void StartReceiving(
const PacketReceiverCallbackWithStatus& packet_receiver) final;
void StopReceiving() final;
// Set a new DSCP value to the socket. The value will be set right before
// the next send.
void SetDscp(net::DiffServCodePoint dscp);
// Set UdpTransport options.
// Possible keys are:
// "pacer_max_burst_size": int
// - Specifies how many pakcets to send per 10 ms, maximum.
// "send_buffer_min_size": int
// - Specifies the minimum socket send buffer size.
// "DSCP" (value ignored)
// - Turns DSCP on (higher IP Precedence and Type of Service).
// "disable_non_blocking_io" (value ignored)
// - Windows only. Turns off non-blocking IO for the socket.
// Note: Non-blocking IO is, by default, enabled on all platforms.
void SetUdpOptions(const base::DictionaryValue& options);
// This has to be called before |StartReceiving()| to change the
// |send_buffer_size_|. Calling |SetUdpOptions()| will automatically call it.
void SetSendBufferSize(int32_t send_buffer_size);
#if defined(OS_WIN)
// Switch to use non-blocking IO. Must be called before StartReceiving().
void UseNonBlockingIO();
#endif
// PacketSender implementations.
bool SendPacket(PacketRef packet, const base::Closure& cb) final;
int64_t GetBytesSent() final;
private:
// Requests and processes packets from |udp_socket_|. This method is called
// once with |length_or_status| set to net::ERR_IO_PENDING to start receiving
// packets. Thereafter, it is called with some other value as the callback
// response from UdpSocket::RecvFrom().
void ReceiveNextPacket(int length_or_status);
// Schedule packet receiving, if needed.
void ScheduleReceiveNextPacket();
void OnSent(const scoped_refptr<net::IOBuffer>& buf,
PacketRef packet,
const base::Closure& cb,
int result);
const scoped_refptr<base::SingleThreadTaskRunner> io_thread_proxy_;
const net::IPEndPoint local_addr_;
net::IPEndPoint remote_addr_;
scoped_ptr<net::UDPSocket> udp_socket_;
bool send_pending_;
bool receive_pending_;
bool client_connected_;
net::DiffServCodePoint next_dscp_value_;
scoped_ptr<Packet> next_packet_;
scoped_refptr<net::WrappedIOBuffer> recv_buf_;
net::IPEndPoint recv_addr_;
PacketReceiverCallbackWithStatus packet_receiver_;
int32_t send_buffer_size_;
const CastTransportStatusCallback status_callback_;
int bytes_sent_;
// NOTE: Weak pointers must be invalidated before all other member variables.
base::WeakPtrFactory<UdpTransport> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(UdpTransport);
};
} // namespace cast
} // namespace media
#endif // MEDIA_CAST_NET_UDP_TRANSPORT_H_
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