Adds trunk/talk folder of revision 359 from libjingles google code to
trunk/talk git-svn-id: http://webrtc.googlecode.com/svn/trunk@4318 4adac7df-926f-26a2-2b94-8c16560cd09d
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henrike@webrtc.org
295
talk/app/webrtc/datachannel.cc
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295
talk/app/webrtc/datachannel.cc
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/*
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* libjingle
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* Copyright 2012, Google Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "talk/app/webrtc/datachannel.h"
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#include <string>
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#include "talk/app/webrtc/webrtcsession.h"
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#include "talk/base/logging.h"
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#include "talk/base/refcount.h"
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namespace webrtc {
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static size_t kMaxQueuedDataPackets = 100;
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talk_base::scoped_refptr<DataChannel> DataChannel::Create(
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WebRtcSession* session,
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const std::string& label,
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const DataChannelInit* config) {
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talk_base::scoped_refptr<DataChannel> channel(
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new talk_base::RefCountedObject<DataChannel>(session, label));
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if (!channel->Init(config)) {
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return NULL;
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}
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return channel;
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}
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DataChannel::DataChannel(WebRtcSession* session, const std::string& label)
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: label_(label),
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observer_(NULL),
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state_(kConnecting),
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was_ever_writable_(false),
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session_(session),
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data_session_(NULL),
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send_ssrc_set_(false),
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send_ssrc_(0),
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receive_ssrc_set_(false),
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receive_ssrc_(0) {
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}
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bool DataChannel::Init(const DataChannelInit* config) {
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if (config) {
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if (session_->data_channel_type() == cricket::DCT_RTP &&
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(config->reliable ||
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config->id != -1 ||
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config->maxRetransmits != -1 ||
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config->maxRetransmitTime != -1)) {
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LOG(LS_ERROR) << "Failed to initialize the RTP data channel due to "
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<< "invalid DataChannelInit.";
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return false;
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} else if (session_->data_channel_type() == cricket::DCT_SCTP) {
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if (config->id < -1 ||
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config->maxRetransmits < -1 ||
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config->maxRetransmitTime < -1) {
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LOG(LS_ERROR) << "Failed to initialize the SCTP data channel due to "
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<< "invalid DataChannelInit.";
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return false;
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}
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if (config->maxRetransmits != -1 && config->maxRetransmitTime != -1) {
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LOG(LS_ERROR) <<
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"maxRetransmits and maxRetransmitTime should not be both set.";
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return false;
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}
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}
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config_ = *config;
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}
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return true;
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}
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bool DataChannel::HasNegotiationCompleted() {
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return send_ssrc_set_ == receive_ssrc_set_;
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}
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DataChannel::~DataChannel() {
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ClearQueuedData();
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}
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void DataChannel::RegisterObserver(DataChannelObserver* observer) {
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observer_ = observer;
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DeliverQueuedData();
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}
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void DataChannel::UnregisterObserver() {
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observer_ = NULL;
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}
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bool DataChannel::reliable() const {
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if (session_->data_channel_type() == cricket::DCT_RTP) {
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return false;
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} else {
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return config_.maxRetransmits == -1 &&
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config_.maxRetransmitTime == -1;
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}
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}
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uint64 DataChannel::buffered_amount() const {
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return 0;
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}
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void DataChannel::Close() {
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if (state_ == kClosed)
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return;
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send_ssrc_ = 0;
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send_ssrc_set_ = false;
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SetState(kClosing);
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UpdateState();
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}
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bool DataChannel::Send(const DataBuffer& buffer) {
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if (state_ != kOpen) {
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return false;
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}
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cricket::SendDataParams send_params;
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send_params.ssrc = send_ssrc_;
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if (session_->data_channel_type() == cricket::DCT_SCTP) {
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send_params.ordered = config_.ordered;
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send_params.max_rtx_count = config_.maxRetransmits;
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send_params.max_rtx_ms = config_.maxRetransmitTime;
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}
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send_params.type = buffer.binary ? cricket::DMT_BINARY : cricket::DMT_TEXT;
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cricket::SendDataResult send_result;
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// TODO(pthatcher): Use send_result.would_block for buffering.
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return session_->data_channel()->SendData(
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send_params, buffer.data, &send_result);
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}
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void DataChannel::SetReceiveSsrc(uint32 receive_ssrc) {
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if (receive_ssrc_set_) {
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ASSERT(session_->data_channel_type() == cricket::DCT_RTP ||
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receive_ssrc_ == send_ssrc_);
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return;
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}
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receive_ssrc_ = receive_ssrc;
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receive_ssrc_set_ = true;
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UpdateState();
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}
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// The remote peer request that this channel shall be closed.
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void DataChannel::RemotePeerRequestClose() {
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DoClose();
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}
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void DataChannel::SetSendSsrc(uint32 send_ssrc) {
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if (send_ssrc_set_) {
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ASSERT(session_->data_channel_type() == cricket::DCT_RTP ||
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receive_ssrc_ == send_ssrc_);
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return;
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}
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send_ssrc_ = send_ssrc;
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send_ssrc_set_ = true;
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UpdateState();
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}
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// The underlaying data engine is closing.
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// This function make sure the DataChannel is disconneced and change state to
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// kClosed.
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void DataChannel::OnDataEngineClose() {
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DoClose();
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}
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void DataChannel::DoClose() {
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receive_ssrc_set_ = false;
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send_ssrc_set_ = false;
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SetState(kClosing);
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UpdateState();
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}
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void DataChannel::UpdateState() {
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switch (state_) {
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case kConnecting: {
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if (HasNegotiationCompleted()) {
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if (!IsConnectedToDataSession()) {
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ConnectToDataSession();
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}
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if (was_ever_writable_) {
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SetState(kOpen);
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// If we have received buffers before the channel got writable.
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// Deliver them now.
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DeliverQueuedData();
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}
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}
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break;
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}
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case kOpen: {
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break;
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}
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case kClosing: {
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if (IsConnectedToDataSession()) {
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DisconnectFromDataSession();
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}
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if (HasNegotiationCompleted()) {
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SetState(kClosed);
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}
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break;
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}
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case kClosed:
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break;
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}
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}
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void DataChannel::SetState(DataState state) {
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state_ = state;
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if (observer_) {
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observer_->OnStateChange();
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}
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}
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void DataChannel::ConnectToDataSession() {
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ASSERT(session_->data_channel() != NULL);
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if (!session_->data_channel()) {
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LOG(LS_ERROR) << "The DataEngine does not exist.";
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return;
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}
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data_session_ = session_->data_channel();
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data_session_->SignalReadyToSendData.connect(this,
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&DataChannel::OnChannelReady);
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data_session_->SignalDataReceived.connect(this, &DataChannel::OnDataReceived);
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}
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void DataChannel::DisconnectFromDataSession() {
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data_session_->SignalReadyToSendData.disconnect(this);
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data_session_->SignalDataReceived.disconnect(this);
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data_session_ = NULL;
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}
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void DataChannel::DeliverQueuedData() {
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if (was_ever_writable_ && observer_) {
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while (!queued_data_.empty()) {
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DataBuffer* buffer = queued_data_.front();
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observer_->OnMessage(*buffer);
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queued_data_.pop();
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delete buffer;
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}
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}
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}
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void DataChannel::ClearQueuedData() {
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while (!queued_data_.empty()) {
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DataBuffer* buffer = queued_data_.front();
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queued_data_.pop();
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delete buffer;
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}
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}
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void DataChannel::OnDataReceived(cricket::DataChannel* channel,
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const cricket::ReceiveDataParams& params,
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const talk_base::Buffer& payload) {
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if (params.ssrc == receive_ssrc_) {
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bool binary = false;
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talk_base::scoped_ptr<DataBuffer> buffer(new DataBuffer(payload, binary));
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if (was_ever_writable_ && observer_) {
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observer_->OnMessage(*buffer.get());
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} else {
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if (queued_data_.size() > kMaxQueuedDataPackets) {
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ClearQueuedData();
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}
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queued_data_.push(buffer.release());
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}
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}
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}
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void DataChannel::OnChannelReady(bool writable) {
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if (!was_ever_writable_ && writable) {
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was_ever_writable_ = true;
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UpdateState();
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}
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}
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} // namespace webrtc
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