3 * Copyright 2004 Google Inc.
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6 * modification, are permitted provided that the following conditions are met:
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28 #ifndef TALK_SESSION_MEDIA_CHANNEL_H_
29 #define TALK_SESSION_MEDIA_CHANNEL_H_
34 #include "talk/base/asyncudpsocket.h"
35 #include "talk/base/criticalsection.h"
36 #include "talk/base/network.h"
37 #include "talk/base/sigslot.h"
38 #include "talk/base/window.h"
39 #include "talk/media/base/mediachannel.h"
40 #include "talk/media/base/mediaengine.h"
41 #include "talk/media/base/screencastid.h"
42 #include "talk/media/base/streamparams.h"
43 #include "talk/media/base/videocapturer.h"
44 #include "talk/p2p/base/session.h"
45 #include "talk/p2p/client/socketmonitor.h"
46 #include "talk/session/media/audiomonitor.h"
47 #include "talk/session/media/bundlefilter.h"
48 #include "talk/session/media/mediamonitor.h"
49 #include "talk/session/media/mediasession.h"
50 #include "talk/session/media/rtcpmuxfilter.h"
51 #include "talk/session/media/srtpfilter.h"
56 class MediaContentDescription;
57 struct TypingMonitorOptions;
62 SINK_PRE_CRYPTO, // Sink packets before encryption or after decryption.
63 SINK_POST_CRYPTO // Sink packets after encryption or before decryption.
66 // BaseChannel contains logic common to voice and video, including
67 // enable/mute, marshaling calls to a worker thread, and
68 // connection and media monitors.
70 // WARNING! SUBCLASSES MUST CALL Deinit() IN THEIR DESTRUCTORS!
71 // This is required to avoid a data race between the destructor modifying the
72 // vtable, and the media channel's thread using BaseChannel as the
76 : public talk_base::MessageHandler, public sigslot::has_slots<>,
77 public MediaChannel::NetworkInterface {
79 BaseChannel(talk_base::Thread* thread, MediaEngineInterface* media_engine,
80 MediaChannel* channel, BaseSession* session,
81 const std::string& content_name, bool rtcp);
82 virtual ~BaseChannel();
83 bool Init(TransportChannel* transport_channel,
84 TransportChannel* rtcp_transport_channel);
85 // Deinit may be called multiple times and is simply ignored if it's alreay
89 talk_base::Thread* worker_thread() const { return worker_thread_; }
90 BaseSession* session() const { return session_; }
91 const std::string& content_name() { return content_name_; }
92 TransportChannel* transport_channel() const {
93 return transport_channel_;
95 TransportChannel* rtcp_transport_channel() const {
96 return rtcp_transport_channel_;
98 bool enabled() const { return enabled_; }
100 // This function returns true if we are using SRTP.
101 bool secure() const { return srtp_filter_.IsActive(); }
102 // The following function returns true if we are using
103 // DTLS-based keying. If you turned off SRTP later, however
104 // you could have secure() == false and dtls_secure() == true.
105 bool secure_dtls() const { return dtls_keyed_; }
106 // This function returns true if we require secure channel for call setup.
107 bool secure_required() const { return secure_required_; }
109 bool writable() const { return writable_; }
110 bool IsStreamMuted(uint32 ssrc);
113 bool SetLocalContent(const MediaContentDescription* content,
114 ContentAction action,
115 std::string* error_desc);
116 bool SetRemoteContent(const MediaContentDescription* content,
117 ContentAction action,
118 std::string* error_desc);
120 bool Enable(bool enable);
121 // Mute sending media on the stream with SSRC |ssrc|
122 // If there is only one sending stream SSRC 0 can be used.
123 bool MuteStream(uint32 ssrc, bool mute);
126 bool AddRecvStream(const StreamParams& sp);
127 bool RemoveRecvStream(uint32 ssrc);
128 bool AddSendStream(const StreamParams& sp);
129 bool RemoveSendStream(uint32 ssrc);
132 void StartConnectionMonitor(int cms);
133 void StopConnectionMonitor();
135 void set_srtp_signal_silent_time(uint32 silent_time) {
136 srtp_filter_.set_signal_silent_time(silent_time);
139 void set_content_name(const std::string& content_name) {
140 ASSERT(signaling_thread()->IsCurrent());
142 if (session_->state() != BaseSession::STATE_INIT) {
143 LOG(LS_ERROR) << "Content name for a channel can be changed only "
144 << "when BaseSession is in STATE_INIT state.";
147 content_name_ = content_name;
151 void RegisterSendSink(T* sink,
152 void (T::*OnPacket)(const void*, size_t, bool),
154 talk_base::CritScope cs(&signal_send_packet_cs_);
155 if (SINK_POST_CRYPTO == type) {
156 SignalSendPacketPostCrypto.disconnect(sink);
157 SignalSendPacketPostCrypto.connect(sink, OnPacket);
159 SignalSendPacketPreCrypto.disconnect(sink);
160 SignalSendPacketPreCrypto.connect(sink, OnPacket);
164 void UnregisterSendSink(sigslot::has_slots<>* sink,
166 talk_base::CritScope cs(&signal_send_packet_cs_);
167 if (SINK_POST_CRYPTO == type) {
168 SignalSendPacketPostCrypto.disconnect(sink);
170 SignalSendPacketPreCrypto.disconnect(sink);
174 bool HasSendSinks(SinkType type) {
175 talk_base::CritScope cs(&signal_send_packet_cs_);
176 if (SINK_POST_CRYPTO == type) {
177 return !SignalSendPacketPostCrypto.is_empty();
179 return !SignalSendPacketPreCrypto.is_empty();
184 void RegisterRecvSink(T* sink,
185 void (T::*OnPacket)(const void*, size_t, bool),
187 talk_base::CritScope cs(&signal_recv_packet_cs_);
188 if (SINK_POST_CRYPTO == type) {
189 SignalRecvPacketPostCrypto.disconnect(sink);
190 SignalRecvPacketPostCrypto.connect(sink, OnPacket);
192 SignalRecvPacketPreCrypto.disconnect(sink);
193 SignalRecvPacketPreCrypto.connect(sink, OnPacket);
197 void UnregisterRecvSink(sigslot::has_slots<>* sink,
199 talk_base::CritScope cs(&signal_recv_packet_cs_);
200 if (SINK_POST_CRYPTO == type) {
201 SignalRecvPacketPostCrypto.disconnect(sink);
203 SignalRecvPacketPreCrypto.disconnect(sink);
207 bool HasRecvSinks(SinkType type) {
208 talk_base::CritScope cs(&signal_recv_packet_cs_);
209 if (SINK_POST_CRYPTO == type) {
210 return !SignalRecvPacketPostCrypto.is_empty();
212 return !SignalRecvPacketPreCrypto.is_empty();
216 BundleFilter* bundle_filter() { return &bundle_filter_; }
218 const std::vector<StreamParams>& local_streams() const {
219 return local_streams_;
221 const std::vector<StreamParams>& remote_streams() const {
222 return remote_streams_;
225 // Used for latency measurements.
226 sigslot::signal1<BaseChannel*> SignalFirstPacketReceived;
228 // Used to alert UI when the muted status changes, perhaps autonomously.
229 sigslot::repeater2<BaseChannel*, bool> SignalAutoMuted;
231 // Made public for easier testing.
232 void SetReadyToSend(TransportChannel* channel, bool ready);
235 MediaEngineInterface* media_engine() const { return media_engine_; }
236 virtual MediaChannel* media_channel() const { return media_channel_; }
237 void set_rtcp_transport_channel(TransportChannel* transport);
238 bool was_ever_writable() const { return was_ever_writable_; }
239 void set_local_content_direction(MediaContentDirection direction) {
240 local_content_direction_ = direction;
242 void set_remote_content_direction(MediaContentDirection direction) {
243 remote_content_direction_ = direction;
245 bool IsReadyToReceive() const;
246 bool IsReadyToSend() const;
247 talk_base::Thread* signaling_thread() { return session_->signaling_thread(); }
248 SrtpFilter* srtp_filter() { return &srtp_filter_; }
249 bool rtcp() const { return rtcp_; }
251 void FlushRtcpMessages();
253 // NetworkInterface implementation, called by MediaEngine
254 virtual bool SendPacket(talk_base::Buffer* packet,
255 talk_base::DiffServCodePoint dscp);
256 virtual bool SendRtcp(talk_base::Buffer* packet,
257 talk_base::DiffServCodePoint dscp);
258 virtual int SetOption(SocketType type, talk_base::Socket::Option o, int val);
260 // From TransportChannel
261 void OnWritableState(TransportChannel* channel);
262 virtual void OnChannelRead(TransportChannel* channel,
265 const talk_base::PacketTime& packet_time,
267 void OnReadyToSend(TransportChannel* channel);
269 bool PacketIsRtcp(const TransportChannel* channel, const char* data,
271 bool SendPacket(bool rtcp, talk_base::Buffer* packet,
272 talk_base::DiffServCodePoint dscp);
273 virtual bool WantsPacket(bool rtcp, talk_base::Buffer* packet);
274 void HandlePacket(bool rtcp, talk_base::Buffer* packet,
275 const talk_base::PacketTime& packet_time);
277 // Apply the new local/remote session description.
278 void OnNewLocalDescription(BaseSession* session, ContentAction action);
279 void OnNewRemoteDescription(BaseSession* session, ContentAction action);
281 void EnableMedia_w();
282 void DisableMedia_w();
283 virtual bool MuteStream_w(uint32 ssrc, bool mute);
284 bool IsStreamMuted_w(uint32 ssrc);
285 void ChannelWritable_w();
286 void ChannelNotWritable_w();
287 bool AddRecvStream_w(const StreamParams& sp);
288 bool RemoveRecvStream_w(uint32 ssrc);
289 bool AddSendStream_w(const StreamParams& sp);
290 bool RemoveSendStream_w(uint32 ssrc);
291 virtual bool ShouldSetupDtlsSrtp() const;
292 // Do the DTLS key expansion and impose it on the SRTP/SRTCP filters.
293 // |rtcp_channel| indicates whether to set up the RTP or RTCP filter.
294 bool SetupDtlsSrtp(bool rtcp_channel);
295 // Set the DTLS-SRTP cipher policy on this channel as appropriate.
296 bool SetDtlsSrtpCiphers(TransportChannel *tc, bool rtcp);
298 virtual void ChangeState() = 0;
300 // Gets the content info appropriate to the channel (audio or video).
301 virtual const ContentInfo* GetFirstContent(
302 const SessionDescription* sdesc) = 0;
303 bool UpdateLocalStreams_w(const std::vector<StreamParams>& streams,
304 ContentAction action,
305 std::string* error_desc);
306 bool UpdateRemoteStreams_w(const std::vector<StreamParams>& streams,
307 ContentAction action,
308 std::string* error_desc);
309 bool SetBaseLocalContent_w(const MediaContentDescription* content,
310 ContentAction action,
311 std::string* error_desc);
312 virtual bool SetLocalContent_w(const MediaContentDescription* content,
313 ContentAction action,
314 std::string* error_desc) = 0;
315 bool SetBaseRemoteContent_w(const MediaContentDescription* content,
316 ContentAction action,
317 std::string* error_desc);
318 virtual bool SetRemoteContent_w(const MediaContentDescription* content,
319 ContentAction action,
320 std::string* error_desc) = 0;
322 // Helper method to get RTP Absoulute SendTime extension header id if
323 // present in remote supported extensions list.
324 void MaybeCacheRtpAbsSendTimeHeaderExtension(
325 const std::vector<RtpHeaderExtension>& extensions);
327 bool CheckSrtpConfig(const std::vector<CryptoParams>& cryptos,
329 std::string* error_desc);
330 bool SetSrtp_w(const std::vector<CryptoParams>& params,
331 ContentAction action,
333 std::string* error_desc);
334 bool SetRtcpMux_w(bool enable,
335 ContentAction action,
337 std::string* error_desc);
339 // From MessageHandler
340 virtual void OnMessage(talk_base::Message* pmsg);
342 // Handled in derived classes
343 // Get the SRTP ciphers to use for RTP media
344 virtual void GetSrtpCiphers(std::vector<std::string>* ciphers) const = 0;
345 virtual void OnConnectionMonitorUpdate(SocketMonitor* monitor,
346 const std::vector<ConnectionInfo>& infos) = 0;
348 // Helper function for invoking bool-returning methods on the worker thread.
349 template <class FunctorT>
350 bool InvokeOnWorker(const FunctorT& functor) {
351 return worker_thread_->Invoke<bool>(functor);
355 sigslot::signal3<const void*, size_t, bool> SignalSendPacketPreCrypto;
356 sigslot::signal3<const void*, size_t, bool> SignalSendPacketPostCrypto;
357 sigslot::signal3<const void*, size_t, bool> SignalRecvPacketPreCrypto;
358 sigslot::signal3<const void*, size_t, bool> SignalRecvPacketPostCrypto;
359 talk_base::CriticalSection signal_send_packet_cs_;
360 talk_base::CriticalSection signal_recv_packet_cs_;
362 talk_base::Thread* worker_thread_;
363 MediaEngineInterface* media_engine_;
364 BaseSession* session_;
365 MediaChannel* media_channel_;
366 std::vector<StreamParams> local_streams_;
367 std::vector<StreamParams> remote_streams_;
369 std::string content_name_;
371 TransportChannel* transport_channel_;
372 TransportChannel* rtcp_transport_channel_;
373 SrtpFilter srtp_filter_;
374 RtcpMuxFilter rtcp_mux_filter_;
375 BundleFilter bundle_filter_;
376 talk_base::scoped_ptr<SocketMonitor> socket_monitor_;
379 bool rtp_ready_to_send_;
380 bool rtcp_ready_to_send_;
381 bool was_ever_writable_;
382 MediaContentDirection local_content_direction_;
383 MediaContentDirection remote_content_direction_;
384 std::set<uint32> muted_streams_;
385 bool has_received_packet_;
387 bool secure_required_;
388 int rtp_abs_sendtime_extn_id_;
391 // VoiceChannel is a specialization that adds support for early media, DTMF,
392 // and input/output level monitoring.
393 class VoiceChannel : public BaseChannel {
395 VoiceChannel(talk_base::Thread* thread, MediaEngineInterface* media_engine,
396 VoiceMediaChannel* channel, BaseSession* session,
397 const std::string& content_name, bool rtcp);
400 bool SetRemoteRenderer(uint32 ssrc, AudioRenderer* renderer);
401 bool SetLocalRenderer(uint32 ssrc, AudioRenderer* renderer);
403 // downcasts a MediaChannel
404 virtual VoiceMediaChannel* media_channel() const {
405 return static_cast<VoiceMediaChannel*>(BaseChannel::media_channel());
408 bool SetRingbackTone(const void* buf, int len);
409 void SetEarlyMedia(bool enable);
410 // This signal is emitted when we have gone a period of time without
411 // receiving early media. When received, a UI should start playing its
413 sigslot::signal1<VoiceChannel*> SignalEarlyMediaTimeout;
415 bool PlayRingbackTone(uint32 ssrc, bool play, bool loop);
416 // TODO(ronghuawu): Replace PressDTMF with InsertDtmf.
417 bool PressDTMF(int digit, bool playout);
418 // Returns if the telephone-event has been negotiated.
419 bool CanInsertDtmf();
420 // Send and/or play a DTMF |event| according to the |flags|.
421 // The DTMF out-of-band signal will be used on sending.
422 // The |ssrc| should be either 0 or a valid send stream ssrc.
423 // The valid value for the |event| are 0 which corresponding to DTMF
424 // event 0-9, *, #, A-D.
425 bool InsertDtmf(uint32 ssrc, int event_code, int duration, int flags);
426 bool SetOutputScaling(uint32 ssrc, double left, double right);
427 // Get statistics about the current media session.
428 bool GetStats(VoiceMediaInfo* stats);
430 // Monitoring functions
431 sigslot::signal2<VoiceChannel*, const std::vector<ConnectionInfo>&>
432 SignalConnectionMonitor;
434 void StartMediaMonitor(int cms);
435 void StopMediaMonitor();
436 sigslot::signal2<VoiceChannel*, const VoiceMediaInfo&> SignalMediaMonitor;
438 void StartAudioMonitor(int cms);
439 void StopAudioMonitor();
440 bool IsAudioMonitorRunning() const;
441 sigslot::signal2<VoiceChannel*, const AudioInfo&> SignalAudioMonitor;
443 void StartTypingMonitor(const TypingMonitorOptions& settings);
444 void StopTypingMonitor();
445 bool IsTypingMonitorRunning() const;
447 // Overrides BaseChannel::MuteStream_w.
448 virtual bool MuteStream_w(uint32 ssrc, bool mute);
450 int GetInputLevel_w();
451 int GetOutputLevel_w();
452 void GetActiveStreams_w(AudioInfo::StreamList* actives);
454 // Signal errors from VoiceMediaChannel. Arguments are:
455 // ssrc(uint32), and error(VoiceMediaChannel::Error).
456 sigslot::signal3<VoiceChannel*, uint32, VoiceMediaChannel::Error>
459 // Configuration and setting.
460 bool SetChannelOptions(const AudioOptions& options);
463 // overrides from BaseChannel
464 virtual void OnChannelRead(TransportChannel* channel,
465 const char* data, size_t len,
466 const talk_base::PacketTime& packet_time,
468 virtual void ChangeState();
469 virtual const ContentInfo* GetFirstContent(const SessionDescription* sdesc);
470 virtual bool SetLocalContent_w(const MediaContentDescription* content,
471 ContentAction action,
472 std::string* error_desc);
473 virtual bool SetRemoteContent_w(const MediaContentDescription* content,
474 ContentAction action,
475 std::string* error_desc);
476 bool SetRingbackTone_w(const void* buf, int len);
477 bool PlayRingbackTone_w(uint32 ssrc, bool play, bool loop);
478 void HandleEarlyMediaTimeout();
479 bool InsertDtmf_w(uint32 ssrc, int event, int duration, int flags);
480 bool SetOutputScaling_w(uint32 ssrc, double left, double right);
481 bool GetStats_w(VoiceMediaInfo* stats);
483 virtual void OnMessage(talk_base::Message* pmsg);
484 virtual void GetSrtpCiphers(std::vector<std::string>* ciphers) const;
485 virtual void OnConnectionMonitorUpdate(
486 SocketMonitor* monitor, const std::vector<ConnectionInfo>& infos);
487 virtual void OnMediaMonitorUpdate(
488 VoiceMediaChannel* media_channel, const VoiceMediaInfo& info);
489 void OnAudioMonitorUpdate(AudioMonitor* monitor, const AudioInfo& info);
490 void OnVoiceChannelError(uint32 ssrc, VoiceMediaChannel::Error error);
491 void SendLastMediaError();
492 void OnSrtpError(uint32 ssrc, SrtpFilter::Mode mode, SrtpFilter::Error error);
494 static const int kEarlyMediaTimeout = 1000;
495 bool received_media_;
496 talk_base::scoped_ptr<VoiceMediaMonitor> media_monitor_;
497 talk_base::scoped_ptr<AudioMonitor> audio_monitor_;
498 talk_base::scoped_ptr<TypingMonitor> typing_monitor_;
501 // VideoChannel is a specialization for video.
502 class VideoChannel : public BaseChannel {
504 // Make screen capturer virtual so that it can be overriden in testing.
505 // E.g. used to test that window events are triggered correctly.
506 class ScreenCapturerFactory {
508 virtual VideoCapturer* CreateScreenCapturer(const ScreencastId& window) = 0;
509 virtual ~ScreenCapturerFactory() {}
512 VideoChannel(talk_base::Thread* thread, MediaEngineInterface* media_engine,
513 VideoMediaChannel* channel, BaseSession* session,
514 const std::string& content_name, bool rtcp,
515 VoiceChannel* voice_channel);
519 bool SetRenderer(uint32 ssrc, VideoRenderer* renderer);
520 bool ApplyViewRequest(const ViewRequest& request);
522 // TODO(pthatcher): Refactor to use a "capture id" instead of an
523 // ssrc here as the "key".
524 VideoCapturer* AddScreencast(uint32 ssrc, const ScreencastId& id);
525 bool SetCapturer(uint32 ssrc, VideoCapturer* capturer);
526 bool RemoveScreencast(uint32 ssrc);
527 // True if we've added a screencast. Doesn't matter if the capturer
528 // has been started or not.
529 bool IsScreencasting();
530 int GetScreencastFps(uint32 ssrc);
531 int GetScreencastMaxPixels(uint32 ssrc);
532 // Get statistics about the current media session.
533 bool GetStats(const StatsOptions& options, VideoMediaInfo* stats);
535 sigslot::signal2<VideoChannel*, const std::vector<ConnectionInfo>&>
536 SignalConnectionMonitor;
538 void StartMediaMonitor(int cms);
539 void StopMediaMonitor();
540 sigslot::signal2<VideoChannel*, const VideoMediaInfo&> SignalMediaMonitor;
541 sigslot::signal2<uint32, talk_base::WindowEvent> SignalScreencastWindowEvent;
543 bool SendIntraFrame();
544 bool RequestIntraFrame();
545 sigslot::signal3<VideoChannel*, uint32, VideoMediaChannel::Error>
548 void SetScreenCaptureFactory(
549 ScreenCapturerFactory* screencapture_factory);
551 // Configuration and setting.
552 bool SetChannelOptions(const VideoOptions& options);
555 // downcasts a MediaChannel
556 virtual VideoMediaChannel* media_channel() const {
557 return static_cast<VideoMediaChannel*>(BaseChannel::media_channel());
561 typedef std::map<uint32, VideoCapturer*> ScreencastMap;
562 struct ScreencastDetailsData;
564 // overrides from BaseChannel
565 virtual void ChangeState();
566 virtual const ContentInfo* GetFirstContent(const SessionDescription* sdesc);
567 virtual bool SetLocalContent_w(const MediaContentDescription* content,
568 ContentAction action,
569 std::string* error_desc);
570 virtual bool SetRemoteContent_w(const MediaContentDescription* content,
571 ContentAction action,
572 std::string* error_desc);
573 bool ApplyViewRequest_w(const ViewRequest& request);
575 VideoCapturer* AddScreencast_w(uint32 ssrc, const ScreencastId& id);
576 bool RemoveScreencast_w(uint32 ssrc);
577 void OnScreencastWindowEvent_s(uint32 ssrc, talk_base::WindowEvent we);
578 bool IsScreencasting_w() const;
579 void GetScreencastDetails_w(ScreencastDetailsData* d) const;
580 void SetScreenCaptureFactory_w(
581 ScreenCapturerFactory* screencapture_factory);
582 bool GetStats_w(VideoMediaInfo* stats);
584 virtual void OnMessage(talk_base::Message* pmsg);
585 virtual void GetSrtpCiphers(std::vector<std::string>* ciphers) const;
586 virtual void OnConnectionMonitorUpdate(
587 SocketMonitor* monitor, const std::vector<ConnectionInfo>& infos);
588 virtual void OnMediaMonitorUpdate(
589 VideoMediaChannel* media_channel, const VideoMediaInfo& info);
590 virtual void OnScreencastWindowEvent(uint32 ssrc,
591 talk_base::WindowEvent event);
592 virtual void OnStateChange(VideoCapturer* capturer, CaptureState ev);
593 bool GetLocalSsrc(const VideoCapturer* capturer, uint32* ssrc);
595 void OnVideoChannelError(uint32 ssrc, VideoMediaChannel::Error error);
596 void OnSrtpError(uint32 ssrc, SrtpFilter::Mode mode, SrtpFilter::Error error);
598 VoiceChannel* voice_channel_;
599 VideoRenderer* renderer_;
600 talk_base::scoped_ptr<ScreenCapturerFactory> screencapture_factory_;
601 ScreencastMap screencast_capturers_;
602 talk_base::scoped_ptr<VideoMediaMonitor> media_monitor_;
604 talk_base::WindowEvent previous_we_;
607 // DataChannel is a specialization for data.
608 class DataChannel : public BaseChannel {
610 DataChannel(talk_base::Thread* thread,
611 DataMediaChannel* media_channel,
612 BaseSession* session,
613 const std::string& content_name,
618 virtual bool SendData(const SendDataParams& params,
619 const talk_base::Buffer& payload,
620 SendDataResult* result);
622 void StartMediaMonitor(int cms);
623 void StopMediaMonitor();
625 // Should be called on the signaling thread only.
626 bool ready_to_send_data() const {
627 return ready_to_send_data_;
630 sigslot::signal2<DataChannel*, const DataMediaInfo&> SignalMediaMonitor;
631 sigslot::signal2<DataChannel*, const std::vector<ConnectionInfo>&>
632 SignalConnectionMonitor;
633 sigslot::signal3<DataChannel*, uint32, DataMediaChannel::Error>
635 sigslot::signal3<DataChannel*,
636 const ReceiveDataParams&,
637 const talk_base::Buffer&>
639 // Signal for notifying when the channel becomes ready to send data.
640 // That occurs when the channel is enabled, the transport is writable,
641 // both local and remote descriptions are set, and the channel is unblocked.
642 sigslot::signal1<bool> SignalReadyToSendData;
645 // downcasts a MediaChannel.
646 virtual DataMediaChannel* media_channel() const {
647 return static_cast<DataMediaChannel*>(BaseChannel::media_channel());
651 struct SendDataMessageData : public talk_base::MessageData {
652 SendDataMessageData(const SendDataParams& params,
653 const talk_base::Buffer* payload,
654 SendDataResult* result)
661 const SendDataParams& params;
662 const talk_base::Buffer* payload;
663 SendDataResult* result;
667 struct DataReceivedMessageData : public talk_base::MessageData {
668 // We copy the data because the data will become invalid after we
669 // handle DataMediaChannel::SignalDataReceived but before we fire
670 // SignalDataReceived.
671 DataReceivedMessageData(
672 const ReceiveDataParams& params, const char* data, size_t len)
676 const ReceiveDataParams params;
677 const talk_base::Buffer payload;
680 typedef talk_base::TypedMessageData<bool> DataChannelReadyToSendMessageData;
682 // overrides from BaseChannel
683 virtual const ContentInfo* GetFirstContent(const SessionDescription* sdesc);
684 // If data_channel_type_ is DCT_NONE, set it. Otherwise, check that
685 // it's the same as what was set previously. Returns false if it's
686 // set to one type one type and changed to another type later.
687 bool SetDataChannelType(DataChannelType new_data_channel_type,
688 std::string* error_desc);
689 // Same as SetDataChannelType, but extracts the type from the
690 // DataContentDescription.
691 bool SetDataChannelTypeFromContent(const DataContentDescription* content,
692 std::string* error_desc);
693 virtual bool SetLocalContent_w(const MediaContentDescription* content,
694 ContentAction action,
695 std::string* error_desc);
696 virtual bool SetRemoteContent_w(const MediaContentDescription* content,
697 ContentAction action,
698 std::string* error_desc);
699 virtual void ChangeState();
700 virtual bool WantsPacket(bool rtcp, talk_base::Buffer* packet);
702 virtual void OnMessage(talk_base::Message* pmsg);
703 virtual void GetSrtpCiphers(std::vector<std::string>* ciphers) const;
704 virtual void OnConnectionMonitorUpdate(
705 SocketMonitor* monitor, const std::vector<ConnectionInfo>& infos);
706 virtual void OnMediaMonitorUpdate(
707 DataMediaChannel* media_channel, const DataMediaInfo& info);
708 virtual bool ShouldSetupDtlsSrtp() const;
710 const ReceiveDataParams& params, const char* data, size_t len);
711 void OnDataChannelError(uint32 ssrc, DataMediaChannel::Error error);
712 void OnDataChannelReadyToSend(bool writable);
713 void OnSrtpError(uint32 ssrc, SrtpFilter::Mode mode, SrtpFilter::Error error);
715 talk_base::scoped_ptr<DataMediaMonitor> media_monitor_;
716 // TODO(pthatcher): Make a separate SctpDataChannel and
717 // RtpDataChannel instead of using this.
718 DataChannelType data_channel_type_;
719 bool ready_to_send_data_;
722 } // namespace cricket
724 #endif // TALK_SESSION_MEDIA_CHANNEL_H_