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webrtc/talk/session/media/channel.h
buildbot@webrtc.org 6bfd6196ff (Auto)update libjingle 67052073-> 67134648 
git-svn-id: http://webrtc.googlecode.com/svn/trunk@6174 4adac7df-926f-26a2-2b94-8c16560cd09d
2014-05-15 16:15:59 +00:00

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/*
* libjingle
* Copyright 2004 Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef TALK_SESSION_MEDIA_CHANNEL_H_
#define TALK_SESSION_MEDIA_CHANNEL_H_
#include <string>
#include <vector>
#include "talk/base/asyncudpsocket.h"
#include "talk/base/criticalsection.h"
#include "talk/base/network.h"
#include "talk/base/sigslot.h"
#include "talk/base/window.h"
#include "talk/media/base/mediachannel.h"
#include "talk/media/base/mediaengine.h"
#include "talk/media/base/screencastid.h"
#include "talk/media/base/streamparams.h"
#include "talk/media/base/videocapturer.h"
#include "talk/p2p/base/session.h"
#include "talk/p2p/client/socketmonitor.h"
#include "talk/session/media/audiomonitor.h"
#include "talk/session/media/bundlefilter.h"
#include "talk/session/media/mediamonitor.h"
#include "talk/session/media/mediasession.h"
#include "talk/session/media/rtcpmuxfilter.h"
#include "talk/session/media/srtpfilter.h"
namespace cricket {
struct CryptoParams;
class MediaContentDescription;
struct TypingMonitorOptions;
class TypingMonitor;
struct ViewRequest;
enum SinkType {
SINK_PRE_CRYPTO, // Sink packets before encryption or after decryption.
SINK_POST_CRYPTO // Sink packets after encryption or before decryption.
};
// BaseChannel contains logic common to voice and video, including
// enable/mute, marshaling calls to a worker thread, and
// connection and media monitors.
//
// WARNING! SUBCLASSES MUST CALL Deinit() IN THEIR DESTRUCTORS!
// This is required to avoid a data race between the destructor modifying the
// vtable, and the media channel's thread using BaseChannel as the
// NetworkInterface.
class BaseChannel
: public talk_base::MessageHandler, public sigslot::has_slots<>,
public MediaChannel::NetworkInterface {
public:
BaseChannel(talk_base::Thread* thread, MediaEngineInterface* media_engine,
MediaChannel* channel, BaseSession* session,
const std::string& content_name, bool rtcp);
virtual ~BaseChannel();
bool Init(TransportChannel* transport_channel,
TransportChannel* rtcp_transport_channel);
// Deinit may be called multiple times and is simply ignored if it's alreay
// done.
void Deinit();
talk_base::Thread* worker_thread() const { return worker_thread_; }
BaseSession* session() const { return session_; }
const std::string& content_name() { return content_name_; }
TransportChannel* transport_channel() const {
return transport_channel_;
}
TransportChannel* rtcp_transport_channel() const {
return rtcp_transport_channel_;
}
bool enabled() const { return enabled_; }
// This function returns true if we are using SRTP.
bool secure() const { return srtp_filter_.IsActive(); }
// The following function returns true if we are using
// DTLS-based keying. If you turned off SRTP later, however
// you could have secure() == false and dtls_secure() == true.
bool secure_dtls() const { return dtls_keyed_; }
// This function returns true if we require secure channel for call setup.
bool secure_required() const { return secure_required_; }
bool writable() const { return writable_; }
bool IsStreamMuted(uint32 ssrc);
// Channel control
bool SetLocalContent(const MediaContentDescription* content,
ContentAction action,
std::string* error_desc);
bool SetRemoteContent(const MediaContentDescription* content,
ContentAction action,
std::string* error_desc);
bool Enable(bool enable);
// Mute sending media on the stream with SSRC |ssrc|
// If there is only one sending stream SSRC 0 can be used.
bool MuteStream(uint32 ssrc, bool mute);
// Multiplexing
bool AddRecvStream(const StreamParams& sp);
bool RemoveRecvStream(uint32 ssrc);
bool AddSendStream(const StreamParams& sp);
bool RemoveSendStream(uint32 ssrc);
// Monitoring
void StartConnectionMonitor(int cms);
void StopConnectionMonitor();
void set_srtp_signal_silent_time(uint32 silent_time) {
srtp_filter_.set_signal_silent_time(silent_time);
}
void set_content_name(const std::string& content_name) {
ASSERT(signaling_thread()->IsCurrent());
ASSERT(!writable_);
if (session_->state() != BaseSession::STATE_INIT) {
LOG(LS_ERROR) << "Content name for a channel can be changed only "
<< "when BaseSession is in STATE_INIT state.";
return;
}
content_name_ = content_name;
}
template <class T>
void RegisterSendSink(T* sink,
void (T::*OnPacket)(const void*, size_t, bool),
SinkType type) {
talk_base::CritScope cs(&signal_send_packet_cs_);
if (SINK_POST_CRYPTO == type) {
SignalSendPacketPostCrypto.disconnect(sink);
SignalSendPacketPostCrypto.connect(sink, OnPacket);
} else {
SignalSendPacketPreCrypto.disconnect(sink);
SignalSendPacketPreCrypto.connect(sink, OnPacket);
}
}
void UnregisterSendSink(sigslot::has_slots<>* sink,
SinkType type) {
talk_base::CritScope cs(&signal_send_packet_cs_);
if (SINK_POST_CRYPTO == type) {
SignalSendPacketPostCrypto.disconnect(sink);
} else {
SignalSendPacketPreCrypto.disconnect(sink);
}
}
bool HasSendSinks(SinkType type) {
talk_base::CritScope cs(&signal_send_packet_cs_);
if (SINK_POST_CRYPTO == type) {
return !SignalSendPacketPostCrypto.is_empty();
} else {
return !SignalSendPacketPreCrypto.is_empty();
}
}
template <class T>
void RegisterRecvSink(T* sink,
void (T::*OnPacket)(const void*, size_t, bool),
SinkType type) {
talk_base::CritScope cs(&signal_recv_packet_cs_);
if (SINK_POST_CRYPTO == type) {
SignalRecvPacketPostCrypto.disconnect(sink);
SignalRecvPacketPostCrypto.connect(sink, OnPacket);
} else {
SignalRecvPacketPreCrypto.disconnect(sink);
SignalRecvPacketPreCrypto.connect(sink, OnPacket);
}
}
void UnregisterRecvSink(sigslot::has_slots<>* sink,
SinkType type) {
talk_base::CritScope cs(&signal_recv_packet_cs_);
if (SINK_POST_CRYPTO == type) {
SignalRecvPacketPostCrypto.disconnect(sink);
} else {
SignalRecvPacketPreCrypto.disconnect(sink);
}
}
bool HasRecvSinks(SinkType type) {
talk_base::CritScope cs(&signal_recv_packet_cs_);
if (SINK_POST_CRYPTO == type) {
return !SignalRecvPacketPostCrypto.is_empty();
} else {
return !SignalRecvPacketPreCrypto.is_empty();
}
}
BundleFilter* bundle_filter() { return &bundle_filter_; }
const std::vector<StreamParams>& local_streams() const {
return local_streams_;
}
const std::vector<StreamParams>& remote_streams() const {
return remote_streams_;
}
// Used for latency measurements.
sigslot::signal1<BaseChannel*> SignalFirstPacketReceived;
// Used to alert UI when the muted status changes, perhaps autonomously.
sigslot::repeater2<BaseChannel*, bool> SignalAutoMuted;
// Made public for easier testing.
void SetReadyToSend(TransportChannel* channel, bool ready);
protected:
MediaEngineInterface* media_engine() const { return media_engine_; }
virtual MediaChannel* media_channel() const { return media_channel_; }
void set_rtcp_transport_channel(TransportChannel* transport);
bool was_ever_writable() const { return was_ever_writable_; }
void set_local_content_direction(MediaContentDirection direction) {
local_content_direction_ = direction;
}
void set_remote_content_direction(MediaContentDirection direction) {
remote_content_direction_ = direction;
}
bool IsReadyToReceive() const;
bool IsReadyToSend() const;
talk_base::Thread* signaling_thread() { return session_->signaling_thread(); }
SrtpFilter* srtp_filter() { return &srtp_filter_; }
bool rtcp() const { return rtcp_; }
void FlushRtcpMessages();
// NetworkInterface implementation, called by MediaEngine
virtual bool SendPacket(talk_base::Buffer* packet,
talk_base::DiffServCodePoint dscp);
virtual bool SendRtcp(talk_base::Buffer* packet,
talk_base::DiffServCodePoint dscp);
virtual int SetOption(SocketType type, talk_base::Socket::Option o, int val);
// From TransportChannel
void OnWritableState(TransportChannel* channel);
virtual void OnChannelRead(TransportChannel* channel,
const char* data,
size_t len,
const talk_base::PacketTime& packet_time,
int flags);
void OnReadyToSend(TransportChannel* channel);
bool PacketIsRtcp(const TransportChannel* channel, const char* data,
size_t len);
bool SendPacket(bool rtcp, talk_base::Buffer* packet,
talk_base::DiffServCodePoint dscp);
virtual bool WantsPacket(bool rtcp, talk_base::Buffer* packet);
void HandlePacket(bool rtcp, talk_base::Buffer* packet,
const talk_base::PacketTime& packet_time);
// Apply the new local/remote session description.
void OnNewLocalDescription(BaseSession* session, ContentAction action);
void OnNewRemoteDescription(BaseSession* session, ContentAction action);
void EnableMedia_w();
void DisableMedia_w();
virtual bool MuteStream_w(uint32 ssrc, bool mute);
bool IsStreamMuted_w(uint32 ssrc);
void ChannelWritable_w();
void ChannelNotWritable_w();
bool AddRecvStream_w(const StreamParams& sp);
bool RemoveRecvStream_w(uint32 ssrc);
bool AddSendStream_w(const StreamParams& sp);
bool RemoveSendStream_w(uint32 ssrc);
virtual bool ShouldSetupDtlsSrtp() const;
// Do the DTLS key expansion and impose it on the SRTP/SRTCP filters.
// |rtcp_channel| indicates whether to set up the RTP or RTCP filter.
bool SetupDtlsSrtp(bool rtcp_channel);
// Set the DTLS-SRTP cipher policy on this channel as appropriate.
bool SetDtlsSrtpCiphers(TransportChannel *tc, bool rtcp);
virtual void ChangeState() = 0;
// Gets the content info appropriate to the channel (audio or video).
virtual const ContentInfo* GetFirstContent(
const SessionDescription* sdesc) = 0;
bool UpdateLocalStreams_w(const std::vector<StreamParams>& streams,
ContentAction action,
std::string* error_desc);
bool UpdateRemoteStreams_w(const std::vector<StreamParams>& streams,
ContentAction action,
std::string* error_desc);
bool SetBaseLocalContent_w(const MediaContentDescription* content,
ContentAction action,
std::string* error_desc);
virtual bool SetLocalContent_w(const MediaContentDescription* content,
ContentAction action,
std::string* error_desc) = 0;
bool SetBaseRemoteContent_w(const MediaContentDescription* content,
ContentAction action,
std::string* error_desc);
virtual bool SetRemoteContent_w(const MediaContentDescription* content,
ContentAction action,
std::string* error_desc) = 0;
// Helper method to get RTP Absoulute SendTime extension header id if
// present in remote supported extensions list.
void MaybeCacheRtpAbsSendTimeHeaderExtension(
const std::vector<RtpHeaderExtension>& extensions);
bool CheckSrtpConfig(const std::vector<CryptoParams>& cryptos,
bool* dtls,
std::string* error_desc);
bool SetSrtp_w(const std::vector<CryptoParams>& params,
ContentAction action,
ContentSource src,
std::string* error_desc);
bool SetRtcpMux_w(bool enable,
ContentAction action,
ContentSource src,
std::string* error_desc);
// From MessageHandler
virtual void OnMessage(talk_base::Message* pmsg);
// Handled in derived classes
// Get the SRTP ciphers to use for RTP media
virtual void GetSrtpCiphers(std::vector<std::string>* ciphers) const = 0;
virtual void OnConnectionMonitorUpdate(SocketMonitor* monitor,
const std::vector<ConnectionInfo>& infos) = 0;
// Helper function for invoking bool-returning methods on the worker thread.
template <class FunctorT>
bool InvokeOnWorker(const FunctorT& functor) {
return worker_thread_->Invoke<bool>(functor);
}
private:
sigslot::signal3<const void*, size_t, bool> SignalSendPacketPreCrypto;
sigslot::signal3<const void*, size_t, bool> SignalSendPacketPostCrypto;
sigslot::signal3<const void*, size_t, bool> SignalRecvPacketPreCrypto;
sigslot::signal3<const void*, size_t, bool> SignalRecvPacketPostCrypto;
talk_base::CriticalSection signal_send_packet_cs_;
talk_base::CriticalSection signal_recv_packet_cs_;
talk_base::Thread* worker_thread_;
MediaEngineInterface* media_engine_;
BaseSession* session_;
MediaChannel* media_channel_;
std::vector<StreamParams> local_streams_;
std::vector<StreamParams> remote_streams_;
std::string content_name_;
bool rtcp_;
TransportChannel* transport_channel_;
TransportChannel* rtcp_transport_channel_;
SrtpFilter srtp_filter_;
RtcpMuxFilter rtcp_mux_filter_;
BundleFilter bundle_filter_;
talk_base::scoped_ptr<SocketMonitor> socket_monitor_;
bool enabled_;
bool writable_;
bool rtp_ready_to_send_;
bool rtcp_ready_to_send_;
bool was_ever_writable_;
MediaContentDirection local_content_direction_;
MediaContentDirection remote_content_direction_;
std::set<uint32> muted_streams_;
bool has_received_packet_;
bool dtls_keyed_;
bool secure_required_;
int rtp_abs_sendtime_extn_id_;
};
// VoiceChannel is a specialization that adds support for early media, DTMF,
// and input/output level monitoring.
class VoiceChannel : public BaseChannel {
public:
VoiceChannel(talk_base::Thread* thread, MediaEngineInterface* media_engine,
VoiceMediaChannel* channel, BaseSession* session,
const std::string& content_name, bool rtcp);
~VoiceChannel();
bool Init();
bool SetRemoteRenderer(uint32 ssrc, AudioRenderer* renderer);
bool SetLocalRenderer(uint32 ssrc, AudioRenderer* renderer);
// downcasts a MediaChannel
virtual VoiceMediaChannel* media_channel() const {
return static_cast<VoiceMediaChannel*>(BaseChannel::media_channel());
}
bool SetRingbackTone(const void* buf, int len);
void SetEarlyMedia(bool enable);
// This signal is emitted when we have gone a period of time without
// receiving early media. When received, a UI should start playing its
// own ringing sound
sigslot::signal1<VoiceChannel*> SignalEarlyMediaTimeout;
bool PlayRingbackTone(uint32 ssrc, bool play, bool loop);
// TODO(ronghuawu): Replace PressDTMF with InsertDtmf.
bool PressDTMF(int digit, bool playout);
// Returns if the telephone-event has been negotiated.
bool CanInsertDtmf();
// Send and/or play a DTMF |event| according to the |flags|.
// The DTMF out-of-band signal will be used on sending.
// The |ssrc| should be either 0 or a valid send stream ssrc.
// The valid value for the |event| are 0 which corresponding to DTMF
// event 0-9, *, #, A-D.
bool InsertDtmf(uint32 ssrc, int event_code, int duration, int flags);
bool SetOutputScaling(uint32 ssrc, double left, double right);
// Get statistics about the current media session.
bool GetStats(VoiceMediaInfo* stats);
// Monitoring functions
sigslot::signal2<VoiceChannel*, const std::vector<ConnectionInfo>&>
SignalConnectionMonitor;
void StartMediaMonitor(int cms);
void StopMediaMonitor();
sigslot::signal2<VoiceChannel*, const VoiceMediaInfo&> SignalMediaMonitor;
void StartAudioMonitor(int cms);
void StopAudioMonitor();
bool IsAudioMonitorRunning() const;
sigslot::signal2<VoiceChannel*, const AudioInfo&> SignalAudioMonitor;
void StartTypingMonitor(const TypingMonitorOptions& settings);
void StopTypingMonitor();
bool IsTypingMonitorRunning() const;
// Overrides BaseChannel::MuteStream_w.
virtual bool MuteStream_w(uint32 ssrc, bool mute);
int GetInputLevel_w();
int GetOutputLevel_w();
void GetActiveStreams_w(AudioInfo::StreamList* actives);
// Signal errors from VoiceMediaChannel. Arguments are:
// ssrc(uint32), and error(VoiceMediaChannel::Error).
sigslot::signal3<VoiceChannel*, uint32, VoiceMediaChannel::Error>
SignalMediaError;
// Configuration and setting.
bool SetChannelOptions(const AudioOptions& options);
private:
// overrides from BaseChannel
virtual void OnChannelRead(TransportChannel* channel,
const char* data, size_t len,
const talk_base::PacketTime& packet_time,
int flags);
virtual void ChangeState();
virtual const ContentInfo* GetFirstContent(const SessionDescription* sdesc);
virtual bool SetLocalContent_w(const MediaContentDescription* content,
ContentAction action,
std::string* error_desc);
virtual bool SetRemoteContent_w(const MediaContentDescription* content,
ContentAction action,
std::string* error_desc);
bool SetRingbackTone_w(const void* buf, int len);
bool PlayRingbackTone_w(uint32 ssrc, bool play, bool loop);
void HandleEarlyMediaTimeout();
bool InsertDtmf_w(uint32 ssrc, int event, int duration, int flags);
bool SetOutputScaling_w(uint32 ssrc, double left, double right);
bool GetStats_w(VoiceMediaInfo* stats);
virtual void OnMessage(talk_base::Message* pmsg);
virtual void GetSrtpCiphers(std::vector<std::string>* ciphers) const;
virtual void OnConnectionMonitorUpdate(
SocketMonitor* monitor, const std::vector<ConnectionInfo>& infos);
virtual void OnMediaMonitorUpdate(
VoiceMediaChannel* media_channel, const VoiceMediaInfo& info);
void OnAudioMonitorUpdate(AudioMonitor* monitor, const AudioInfo& info);
void OnVoiceChannelError(uint32 ssrc, VoiceMediaChannel::Error error);
void SendLastMediaError();
void OnSrtpError(uint32 ssrc, SrtpFilter::Mode mode, SrtpFilter::Error error);
static const int kEarlyMediaTimeout = 1000;
bool received_media_;
talk_base::scoped_ptr<VoiceMediaMonitor> media_monitor_;
talk_base::scoped_ptr<AudioMonitor> audio_monitor_;
talk_base::scoped_ptr<TypingMonitor> typing_monitor_;
};
// VideoChannel is a specialization for video.
class VideoChannel : public BaseChannel {
public:
// Make screen capturer virtual so that it can be overriden in testing.
// E.g. used to test that window events are triggered correctly.
class ScreenCapturerFactory {
public:
virtual VideoCapturer* CreateScreenCapturer(const ScreencastId& window) = 0;
virtual ~ScreenCapturerFactory() {}
};
VideoChannel(talk_base::Thread* thread, MediaEngineInterface* media_engine,
VideoMediaChannel* channel, BaseSession* session,
const std::string& content_name, bool rtcp,
VoiceChannel* voice_channel);
~VideoChannel();
bool Init();
bool SetRenderer(uint32 ssrc, VideoRenderer* renderer);
bool ApplyViewRequest(const ViewRequest& request);
// TODO(pthatcher): Refactor to use a "capture id" instead of an
// ssrc here as the "key".
VideoCapturer* AddScreencast(uint32 ssrc, const ScreencastId& id);
bool SetCapturer(uint32 ssrc, VideoCapturer* capturer);
bool RemoveScreencast(uint32 ssrc);
// True if we've added a screencast. Doesn't matter if the capturer
// has been started or not.
bool IsScreencasting();
int GetScreencastFps(uint32 ssrc);
int GetScreencastMaxPixels(uint32 ssrc);
// Get statistics about the current media session.
bool GetStats(const StatsOptions& options, VideoMediaInfo* stats);
sigslot::signal2<VideoChannel*, const std::vector<ConnectionInfo>&>
SignalConnectionMonitor;
void StartMediaMonitor(int cms);
void StopMediaMonitor();
sigslot::signal2<VideoChannel*, const VideoMediaInfo&> SignalMediaMonitor;
sigslot::signal2<uint32, talk_base::WindowEvent> SignalScreencastWindowEvent;
bool SendIntraFrame();
bool RequestIntraFrame();
sigslot::signal3<VideoChannel*, uint32, VideoMediaChannel::Error>
SignalMediaError;
void SetScreenCaptureFactory(
ScreenCapturerFactory* screencapture_factory);
// Configuration and setting.
bool SetChannelOptions(const VideoOptions& options);
protected:
// downcasts a MediaChannel
virtual VideoMediaChannel* media_channel() const {
return static_cast<VideoMediaChannel*>(BaseChannel::media_channel());
}
private:
typedef std::map<uint32, VideoCapturer*> ScreencastMap;
struct ScreencastDetailsData;
// overrides from BaseChannel
virtual void ChangeState();
virtual const ContentInfo* GetFirstContent(const SessionDescription* sdesc);
virtual bool SetLocalContent_w(const MediaContentDescription* content,
ContentAction action,
std::string* error_desc);
virtual bool SetRemoteContent_w(const MediaContentDescription* content,
ContentAction action,
std::string* error_desc);
bool ApplyViewRequest_w(const ViewRequest& request);
VideoCapturer* AddScreencast_w(uint32 ssrc, const ScreencastId& id);
bool RemoveScreencast_w(uint32 ssrc);
void OnScreencastWindowEvent_s(uint32 ssrc, talk_base::WindowEvent we);
bool IsScreencasting_w() const;
void GetScreencastDetails_w(ScreencastDetailsData* d) const;
void SetScreenCaptureFactory_w(
ScreenCapturerFactory* screencapture_factory);
bool GetStats_w(VideoMediaInfo* stats);
virtual void OnMessage(talk_base::Message* pmsg);
virtual void GetSrtpCiphers(std::vector<std::string>* ciphers) const;
virtual void OnConnectionMonitorUpdate(
SocketMonitor* monitor, const std::vector<ConnectionInfo>& infos);
virtual void OnMediaMonitorUpdate(
VideoMediaChannel* media_channel, const VideoMediaInfo& info);
virtual void OnScreencastWindowEvent(uint32 ssrc,
talk_base::WindowEvent event);
virtual void OnStateChange(VideoCapturer* capturer, CaptureState ev);
bool GetLocalSsrc(const VideoCapturer* capturer, uint32* ssrc);
void OnVideoChannelError(uint32 ssrc, VideoMediaChannel::Error error);
void OnSrtpError(uint32 ssrc, SrtpFilter::Mode mode, SrtpFilter::Error error);
VoiceChannel* voice_channel_;
VideoRenderer* renderer_;
talk_base::scoped_ptr<ScreenCapturerFactory> screencapture_factory_;
ScreencastMap screencast_capturers_;
talk_base::scoped_ptr<VideoMediaMonitor> media_monitor_;
talk_base::WindowEvent previous_we_;
};
// DataChannel is a specialization for data.
class DataChannel : public BaseChannel {
public:
DataChannel(talk_base::Thread* thread,
DataMediaChannel* media_channel,
BaseSession* session,
const std::string& content_name,
bool rtcp);
~DataChannel();
bool Init();
virtual bool SendData(const SendDataParams& params,
const talk_base::Buffer& payload,
SendDataResult* result);
void StartMediaMonitor(int cms);
void StopMediaMonitor();
// Should be called on the signaling thread only.
bool ready_to_send_data() const {
return ready_to_send_data_;
}
sigslot::signal2<DataChannel*, const DataMediaInfo&> SignalMediaMonitor;
sigslot::signal2<DataChannel*, const std::vector<ConnectionInfo>&>
SignalConnectionMonitor;
sigslot::signal3<DataChannel*, uint32, DataMediaChannel::Error>
SignalMediaError;
sigslot::signal3<DataChannel*,
const ReceiveDataParams&,
const talk_base::Buffer&>
SignalDataReceived;
// Signal for notifying when the channel becomes ready to send data.
// That occurs when the channel is enabled, the transport is writable,
// both local and remote descriptions are set, and the channel is unblocked.
sigslot::signal1<bool> SignalReadyToSendData;
protected:
// downcasts a MediaChannel.
virtual DataMediaChannel* media_channel() const {
return static_cast<DataMediaChannel*>(BaseChannel::media_channel());
}
private:
struct SendDataMessageData : public talk_base::MessageData {
SendDataMessageData(const SendDataParams& params,
const talk_base::Buffer* payload,
SendDataResult* result)
: params(params),
payload(payload),
result(result),
succeeded(false) {
}
const SendDataParams& params;
const talk_base::Buffer* payload;
SendDataResult* result;
bool succeeded;
};
struct DataReceivedMessageData : public talk_base::MessageData {
// We copy the data because the data will become invalid after we
// handle DataMediaChannel::SignalDataReceived but before we fire
// SignalDataReceived.
DataReceivedMessageData(
const ReceiveDataParams& params, const char* data, size_t len)
: params(params),
payload(data, len) {
}
const ReceiveDataParams params;
const talk_base::Buffer payload;
};
typedef talk_base::TypedMessageData<bool> DataChannelReadyToSendMessageData;
// overrides from BaseChannel
virtual const ContentInfo* GetFirstContent(const SessionDescription* sdesc);
// If data_channel_type_ is DCT_NONE, set it. Otherwise, check that
// it's the same as what was set previously. Returns false if it's
// set to one type one type and changed to another type later.
bool SetDataChannelType(DataChannelType new_data_channel_type,
std::string* error_desc);
// Same as SetDataChannelType, but extracts the type from the
// DataContentDescription.
bool SetDataChannelTypeFromContent(const DataContentDescription* content,
std::string* error_desc);
virtual bool SetLocalContent_w(const MediaContentDescription* content,
ContentAction action,
std::string* error_desc);
virtual bool SetRemoteContent_w(const MediaContentDescription* content,
ContentAction action,
std::string* error_desc);
virtual void ChangeState();
virtual bool WantsPacket(bool rtcp, talk_base::Buffer* packet);
virtual void OnMessage(talk_base::Message* pmsg);
virtual void GetSrtpCiphers(std::vector<std::string>* ciphers) const;
virtual void OnConnectionMonitorUpdate(
SocketMonitor* monitor, const std::vector<ConnectionInfo>& infos);
virtual void OnMediaMonitorUpdate(
DataMediaChannel* media_channel, const DataMediaInfo& info);
virtual bool ShouldSetupDtlsSrtp() const;
void OnDataReceived(
const ReceiveDataParams& params, const char* data, size_t len);
void OnDataChannelError(uint32 ssrc, DataMediaChannel::Error error);
void OnDataChannelReadyToSend(bool writable);
void OnSrtpError(uint32 ssrc, SrtpFilter::Mode mode, SrtpFilter::Error error);
talk_base::scoped_ptr<DataMediaMonitor> media_monitor_;
// TODO(pthatcher): Make a separate SctpDataChannel and
// RtpDataChannel instead of using this.
DataChannelType data_channel_type_;
bool ready_to_send_data_;
};
} // namespace cricket
#endif // TALK_SESSION_MEDIA_CHANNEL_H_
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