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android / platform / external / webrtc / fa4535b270d5f0d8575dffb4e60f1225751f77f0 / . / talk / session / media / mediasessionclient.cc
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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.
*/
#include <string>
#include "talk/session/media/mediasessionclient.h"
#include "talk/media/base/capturemanager.h"
#include "talk/media/base/cryptoparams.h"
#include "talk/media/sctp/sctpdataengine.h"
#include "talk/p2p/base/constants.h"
#include "talk/p2p/base/parsing.h"
#include "talk/session/media/mediamessages.h"
#include "talk/session/media/srtpfilter.h"
#include "webrtc/libjingle/xmllite/qname.h"
#include "webrtc/libjingle/xmllite/xmlconstants.h"
#include "talk/xmpp/constants.h"
#include "webrtc/base/helpers.h"
#include "webrtc/base/logging.h"
#include "webrtc/base/stringencode.h"
#include "webrtc/base/stringutils.h"
namespace cricket {
#if !defined(DISABLE_MEDIA_ENGINE_FACTORY)
MediaSessionClient::MediaSessionClient(
const buzz::Jid& jid, SessionManager *manager)
: jid_(jid),
session_manager_(manager),
focus_call_(NULL),
channel_manager_(new ChannelManager(session_manager_->worker_thread())),
desc_factory_(channel_manager_,
session_manager_->transport_desc_factory()),
multisession_enabled_(false) {
Construct();
}
#endif
MediaSessionClient::MediaSessionClient(
const buzz::Jid& jid, SessionManager *manager,
MediaEngineInterface* media_engine,
DataEngineInterface* data_media_engine,
DeviceManagerInterface* device_manager)
: jid_(jid),
session_manager_(manager),
focus_call_(NULL),
channel_manager_(new ChannelManager(
media_engine, data_media_engine,
device_manager, new CaptureManager(),
session_manager_->worker_thread())),
desc_factory_(channel_manager_,
session_manager_->transport_desc_factory()),
multisession_enabled_(false) {
Construct();
}
void MediaSessionClient::Construct() {
// Register ourselves as the handler of audio and video sessions.
session_manager_->AddClient(NS_JINGLE_RTP, this);
// Forward device notifications.
SignalDevicesChange.repeat(channel_manager_->SignalDevicesChange);
// Bring up the channel manager.
// In previous versions of ChannelManager, this was done automatically
// in the constructor.
channel_manager_->Init();
}
MediaSessionClient::~MediaSessionClient() {
// Destroy all calls
std::map<uint32, Call *>::iterator it;
while (calls_.begin() != calls_.end()) {
std::map<uint32, Call *>::iterator it = calls_.begin();
DestroyCall((*it).second);
}
// Delete channel manager. This will wait for the channels to exit
delete channel_manager_;
// Remove ourselves from the client map.
session_manager_->RemoveClient(NS_JINGLE_RTP);
}
Call *MediaSessionClient::CreateCall() {
Call *call = new Call(this);
calls_[call->id()] = call;
SignalCallCreate(call);
return call;
}
void MediaSessionClient::OnSessionCreate(Session *session,
bool received_initiate) {
if (received_initiate) {
session->SignalState.connect(this, &MediaSessionClient::OnSessionState);
}
}
void MediaSessionClient::OnSessionState(BaseSession* base_session,
BaseSession::State state) {
// MediaSessionClient can only be used with a Session*, so it's
// safe to cast here.
Session* session = static_cast<Session*>(base_session);
if (state == Session::STATE_RECEIVEDINITIATE) {
// The creation of the call must happen after the session has
// processed the initiate message because we need the
// remote_description to know what content names to use in the
// call.
// If our accept would have no codecs, then we must reject this call.
const SessionDescription* offer = session->remote_description();
const SessionDescription* accept = CreateAnswer(offer, CallOptions());
const ContentInfo* audio_content = GetFirstAudioContent(accept);
bool audio_rejected = (!audio_content) ? true : audio_content->rejected;
const AudioContentDescription* audio_desc = (!audio_content) ? NULL :
static_cast<const AudioContentDescription*>(audio_content->description);
// For some reason, we need a call even if we reject. So, either find a
// matching call or create a new one.
// The matching of existing calls is used to support the multi-session mode
// required for p2p handoffs: ie. once a MUC call is established, a new
// session may be established for the same call but is direct between the
// clients. To indicate that this is the case, the initiator of the incoming
// session is set to be the same as the remote name of the MUC for the
// existing session, thus the client can know that this is a new session for
// the existing call, rather than a whole new call.
Call* call = NULL;
if (multisession_enabled_) {
call = FindCallByRemoteName(session->initiator_name());
}
if (call == NULL) {
// Could not find a matching call, so create a new one.
call = CreateCall();
}
session_map_[session->id()] = call;
call->IncomingSession(session, offer);
if (audio_rejected || !audio_desc || audio_desc->codecs().size() == 0) {
session->Reject(STR_TERMINATE_INCOMPATIBLE_PARAMETERS);
}
delete accept;
}
}
void MediaSessionClient::DestroyCall(Call *call) {
// Change focus away, signal destruction
if (call == focus_call_)
SetFocus(NULL);
SignalCallDestroy(call);
// Remove it from calls_ map and delete
std::map<uint32, Call *>::iterator it = calls_.find(call->id());
if (it != calls_.end())
calls_.erase(it);
delete call;
}
void MediaSessionClient::OnSessionDestroy(Session *session) {
// Find the call this session is in, remove it
SessionMap::iterator it = session_map_.find(session->id());
ASSERT(it != session_map_.end());
if (it != session_map_.end()) {
Call *call = (*it).second;
session_map_.erase(it);
call->RemoveSession(session);
}
}
Call *MediaSessionClient::GetFocus() {
return focus_call_;
}
void MediaSessionClient::SetFocus(Call *call) {
Call *old_focus_call = focus_call_;
if (focus_call_ != call) {
if (focus_call_ != NULL)
focus_call_->EnableChannels(false);
focus_call_ = call;
if (focus_call_ != NULL)
focus_call_->EnableChannels(true);
SignalFocus(focus_call_, old_focus_call);
}
}
void MediaSessionClient::JoinCalls(Call *call_to_join, Call *call) {
// Move all sessions from call to call_to_join, delete call.
// If call_to_join has focus, added sessions should have enabled channels.
if (focus_call_ == call)
SetFocus(NULL);
call_to_join->Join(call, focus_call_ == call_to_join);
DestroyCall(call);
}
Session *MediaSessionClient::CreateSession(Call *call) {
std::string id;
return CreateSession(id, call);
}
Session *MediaSessionClient::CreateSession(const std::string& id, Call* call) {
const std::string& type = NS_JINGLE_RTP;
Session *session = session_manager_->CreateSession(id, jid().Str(), type);
session_map_[session->id()] = call;
return session;
}
Call *MediaSessionClient::FindCallByRemoteName(const std::string &remote_name) {
SessionMap::const_iterator call;
for (call = session_map_.begin(); call != session_map_.end(); ++call) {
std::vector<Session *> sessions = call->second->sessions();
std::vector<Session *>::const_iterator session;
for (session = sessions.begin(); session != sessions.end(); ++session) {
if (remote_name == (*session)->remote_name()) {
return call->second;
}
}
}
return NULL;
}
// TODO(pthatcher): Move all of the parsing and writing functions into
// mediamessages.cc, with unit tests.
bool ParseGingleAudioCodec(const buzz::XmlElement* element, AudioCodec* out) {
int id = GetXmlAttr(element, QN_ID, -1);
if (id < 0)
return false;
std::string name = GetXmlAttr(element, QN_NAME, buzz::STR_EMPTY);
int clockrate = GetXmlAttr(element, QN_CLOCKRATE, 0);
int bitrate = GetXmlAttr(element, QN_BITRATE, 0);
int channels = GetXmlAttr(element, QN_CHANNELS, 1);
*out = AudioCodec(id, name, clockrate, bitrate, channels, 0);
return true;
}
bool ParseGingleVideoCodec(const buzz::XmlElement* element, VideoCodec* out) {
int id = GetXmlAttr(element, QN_ID, -1);
if (id < 0)
return false;
std::string name = GetXmlAttr(element, QN_NAME, buzz::STR_EMPTY);
int width = GetXmlAttr(element, QN_WIDTH, 0);
int height = GetXmlAttr(element, QN_HEIGHT, 0);
int framerate = GetXmlAttr(element, QN_FRAMERATE, 0);
*out = VideoCodec(id, name, width, height, framerate, 0);
return true;
}
// Parses an ssrc string as a legacy stream. If it fails, returns
// false and fills an error message.
bool ParseSsrcAsLegacyStream(const std::string& ssrc_str,
std::vector<StreamParams>* streams,
ParseError* error) {
if (!ssrc_str.empty()) {
uint32 ssrc;
if (!rtc::FromString(ssrc_str, &ssrc)) {
return BadParse("Missing or invalid ssrc.", error);
}
streams->push_back(StreamParams::CreateLegacy(ssrc));
}
return true;
}
void ParseGingleSsrc(const buzz::XmlElement* parent_elem,
const buzz::QName& name,
MediaContentDescription* media) {
const buzz::XmlElement* ssrc_elem = parent_elem->FirstNamed(name);
if (ssrc_elem) {
ParseError error;
ParseSsrcAsLegacyStream(
ssrc_elem->BodyText(), &(media->mutable_streams()), &error);
}
}
bool ParseCryptoParams(const buzz::XmlElement* element,
CryptoParams* out,
ParseError* error) {
if (!element->HasAttr(QN_CRYPTO_SUITE)) {
return BadParse("crypto: crypto-suite attribute missing ", error);
} else if (!element->HasAttr(QN_CRYPTO_KEY_PARAMS)) {
return BadParse("crypto: key-params attribute missing ", error);
} else if (!element->HasAttr(QN_CRYPTO_TAG)) {
return BadParse("crypto: tag attribute missing ", error);
}
const std::string& crypto_suite = element->Attr(QN_CRYPTO_SUITE);
const std::string& key_params = element->Attr(QN_CRYPTO_KEY_PARAMS);
const int tag = GetXmlAttr(element, QN_CRYPTO_TAG, 0);
const std::string& session_params =
element->Attr(QN_CRYPTO_SESSION_PARAMS); // Optional.
*out = CryptoParams(tag, crypto_suite, key_params, session_params);
return true;
}
// Parse the first encryption element found with a matching 'usage'
// element.
// <usage/> is specific to Gingle. In Jingle, <crypto/> is already
// scoped to a content.
// Return false if there was an encryption element and it could not be
// parsed.
bool ParseGingleEncryption(const buzz::XmlElement* desc,
const buzz::QName& usage,
MediaContentDescription* media,
ParseError* error) {
for (const buzz::XmlElement* encryption = desc->FirstNamed(QN_ENCRYPTION);
encryption != NULL;
encryption = encryption->NextNamed(QN_ENCRYPTION)) {
if (encryption->FirstNamed(usage) != NULL) {
if (GetXmlAttr(encryption, QN_ENCRYPTION_REQUIRED, false)) {
media->set_crypto_required(CT_SDES);
}
for (const buzz::XmlElement* crypto = encryption->FirstNamed(QN_CRYPTO);
crypto != NULL;
crypto = crypto->NextNamed(QN_CRYPTO)) {
CryptoParams params;
if (!ParseCryptoParams(crypto, &params, error)) {
return false;
}
media->AddCrypto(params);
}
break;
}
}
return true;
}
void ParseBandwidth(const buzz::XmlElement* parent_elem,
MediaContentDescription* media) {
const buzz::XmlElement* bw_elem = GetXmlChild(parent_elem, LN_BANDWIDTH);
int bandwidth_kbps = -1;
if (bw_elem && rtc::FromString(bw_elem->BodyText(), &bandwidth_kbps)) {
if (bandwidth_kbps >= 0) {
media->set_bandwidth(bandwidth_kbps * 1000);
}
}
}
bool ParseGingleAudioContent(const buzz::XmlElement* content_elem,
ContentDescription** content,
ParseError* error) {
AudioContentDescription* audio = new AudioContentDescription();
int preference = kMaxPayloadId;
if (content_elem->FirstElement()) {
for (const buzz::XmlElement* codec_elem =
content_elem->FirstNamed(QN_GINGLE_AUDIO_PAYLOADTYPE);
codec_elem != NULL;
codec_elem = codec_elem->NextNamed(QN_GINGLE_AUDIO_PAYLOADTYPE)) {
AudioCodec codec;
if (ParseGingleAudioCodec(codec_elem, &codec)) {
codec.preference = preference--;
audio->AddCodec(codec);
}
}
} else {
// For backward compatibility, we can assume the other client is
// an old version of Talk if it has no audio payload types at all.
audio->AddCodec(AudioCodec(103, "ISAC", 16000, -1, 1, 1));
audio->AddCodec(AudioCodec(0, "PCMU", 8000, 64000, 1, 0));
}
ParseGingleSsrc(content_elem, QN_GINGLE_AUDIO_SRCID, audio);
if (!ParseGingleEncryption(content_elem, QN_GINGLE_AUDIO_CRYPTO_USAGE,
audio, error)) {
return false;
}
*content = audio;
return true;
}
bool ParseGingleVideoContent(const buzz::XmlElement* content_elem,
ContentDescription** content,
ParseError* error) {
VideoContentDescription* video = new VideoContentDescription();
int preference = kMaxPayloadId;
for (const buzz::XmlElement* codec_elem =
content_elem->FirstNamed(QN_GINGLE_VIDEO_PAYLOADTYPE);
codec_elem != NULL;
codec_elem = codec_elem->NextNamed(QN_GINGLE_VIDEO_PAYLOADTYPE)) {
VideoCodec codec;
if (ParseGingleVideoCodec(codec_elem, &codec)) {
codec.preference = preference--;
video->AddCodec(codec);
}
}
ParseGingleSsrc(content_elem, QN_GINGLE_VIDEO_SRCID, video);
ParseBandwidth(content_elem, video);
if (!ParseGingleEncryption(content_elem, QN_GINGLE_VIDEO_CRYPTO_USAGE,
video, error)) {
return false;
}
*content = video;
return true;
}
void ParsePayloadTypeParameters(const buzz::XmlElement* element,
std::map<std::string, std::string>* paramap) {
for (const buzz::XmlElement* param = element->FirstNamed(QN_PARAMETER);
param != NULL; param = param->NextNamed(QN_PARAMETER)) {
std::string name = GetXmlAttr(param, QN_PAYLOADTYPE_PARAMETER_NAME,
buzz::STR_EMPTY);
std::string value = GetXmlAttr(param, QN_PAYLOADTYPE_PARAMETER_VALUE,
buzz::STR_EMPTY);
if (!name.empty() && !value.empty()) {
paramap->insert(make_pair(name, value));
}
}
}
void ParseFeedbackParams(const buzz::XmlElement* element,
FeedbackParams* params) {
for (const buzz::XmlElement* param = element->FirstNamed(QN_JINGLE_RTCP_FB);
param != NULL; param = param->NextNamed(QN_JINGLE_RTCP_FB)) {
std::string type = GetXmlAttr(param, QN_TYPE, buzz::STR_EMPTY);
std::string subtype = GetXmlAttr(param, QN_SUBTYPE, buzz::STR_EMPTY);
if (!type.empty()) {
params->Add(FeedbackParam(type, subtype));
}
}
}
void AddFeedbackParams(const FeedbackParams& additional_params,
FeedbackParams* params) {
for (size_t i = 0; i < additional_params.params().size(); ++i) {
params->Add(additional_params.params()[i]);
}
}
int FindWithDefault(const std::map<std::string, std::string>& map,
const std::string& key, const int def) {
std::map<std::string, std::string>::const_iterator iter = map.find(key);
return (iter == map.end()) ? def : atoi(iter->second.c_str());
}
// Parse the first encryption element found.
// Return false if there was an encryption element and it could not be
// parsed.
bool ParseJingleEncryption(const buzz::XmlElement* content_elem,
MediaContentDescription* media,
ParseError* error) {
const buzz::XmlElement* encryption =
content_elem->FirstNamed(QN_ENCRYPTION);
if (encryption == NULL) {
return true;
}
if (GetXmlAttr(encryption, QN_ENCRYPTION_REQUIRED, false)) {
media->set_crypto_required(CT_SDES);
}
for (const buzz::XmlElement* crypto = encryption->FirstNamed(QN_CRYPTO);
crypto != NULL;
crypto = crypto->NextNamed(QN_CRYPTO)) {
CryptoParams params;
if (!ParseCryptoParams(crypto, &params, error)) {
return false;
}
media->AddCrypto(params);
}
return true;
}
bool ParseJingleAudioCodec(const buzz::XmlElement* elem, AudioCodec* codec) {
int id = GetXmlAttr(elem, QN_ID, -1);
if (id < 0)
return false;
std::string name = GetXmlAttr(elem, QN_NAME, buzz::STR_EMPTY);
int clockrate = GetXmlAttr(elem, QN_CLOCKRATE, 0);
int channels = GetXmlAttr(elem, QN_CHANNELS, 1);
std::map<std::string, std::string> paramap;
ParsePayloadTypeParameters(elem, &paramap);
int bitrate = FindWithDefault(paramap, PAYLOADTYPE_PARAMETER_BITRATE, 0);
*codec = AudioCodec(id, name, clockrate, bitrate, channels, 0);
ParseFeedbackParams(elem, &codec->feedback_params);
return true;
}
bool ParseJingleVideoCodec(const buzz::XmlElement* elem, VideoCodec* codec) {
int id = GetXmlAttr(elem, QN_ID, -1);
if (id < 0)
return false;
std::string name = GetXmlAttr(elem, QN_NAME, buzz::STR_EMPTY);
std::map<std::string, std::string> paramap;
ParsePayloadTypeParameters(elem, &paramap);
int width = FindWithDefault(paramap, PAYLOADTYPE_PARAMETER_WIDTH, 0);
int height = FindWithDefault(paramap, PAYLOADTYPE_PARAMETER_HEIGHT, 0);
int framerate = FindWithDefault(paramap, PAYLOADTYPE_PARAMETER_FRAMERATE, 0);
*codec = VideoCodec(id, name, width, height, framerate, 0);
codec->params = paramap;
ParseFeedbackParams(elem, &codec->feedback_params);
return true;
}
bool ParseJingleDataCodec(const buzz::XmlElement* elem, DataCodec* codec) {
int id = GetXmlAttr(elem, QN_ID, -1);
if (id < 0)
return false;
std::string name = GetXmlAttr(elem, QN_NAME, buzz::STR_EMPTY);
*codec = DataCodec(id, name, 0);
ParseFeedbackParams(elem, &codec->feedback_params);
return true;
}
bool ParseJingleStreamsOrLegacySsrc(const buzz::XmlElement* desc_elem,
MediaContentDescription* media,
ParseError* error) {
if (HasJingleStreams(desc_elem)) {
if (!ParseJingleStreams(desc_elem, &(media->mutable_streams()), error)) {
return false;
}
} else {
const std::string ssrc_str = desc_elem->Attr(QN_SSRC);
if (!ParseSsrcAsLegacyStream(
ssrc_str, &(media->mutable_streams()), error)) {
return false;
}
}
return true;
}
bool ParseJingleAudioContent(const buzz::XmlElement* content_elem,
ContentDescription** content,
ParseError* error) {
rtc::scoped_ptr<AudioContentDescription> audio(
new AudioContentDescription());
FeedbackParams content_feedback_params;
ParseFeedbackParams(content_elem, &content_feedback_params);
int preference = kMaxPayloadId;
for (const buzz::XmlElement* payload_elem =
content_elem->FirstNamed(QN_JINGLE_RTP_PAYLOADTYPE);
payload_elem != NULL;
payload_elem = payload_elem->NextNamed(QN_JINGLE_RTP_PAYLOADTYPE)) {
AudioCodec codec;
if (ParseJingleAudioCodec(payload_elem, &codec)) {
AddFeedbackParams(content_feedback_params, &codec.feedback_params);
codec.preference = preference--;
audio->AddCodec(codec);
}
}
if (!ParseJingleStreamsOrLegacySsrc(content_elem, audio.get(), error)) {
return false;
}
if (!ParseJingleEncryption(content_elem, audio.get(), error)) {
return false;
}
audio->set_rtcp_mux(content_elem->FirstNamed(QN_JINGLE_RTCP_MUX) != NULL);
RtpHeaderExtensions hdrexts;
if (!ParseJingleRtpHeaderExtensions(content_elem, &hdrexts, error)) {
return false;
}
audio->set_rtp_header_extensions(hdrexts);
*content = audio.release();
return true;
}
bool ParseJingleVideoContent(const buzz::XmlElement* content_elem,
ContentDescription** content,
ParseError* error) {
rtc::scoped_ptr<VideoContentDescription> video(
new VideoContentDescription());
FeedbackParams content_feedback_params;
ParseFeedbackParams(content_elem, &content_feedback_params);
int preference = kMaxPayloadId;
for (const buzz::XmlElement* payload_elem =
content_elem->FirstNamed(QN_JINGLE_RTP_PAYLOADTYPE);
payload_elem != NULL;
payload_elem = payload_elem->NextNamed(QN_JINGLE_RTP_PAYLOADTYPE)) {
VideoCodec codec;
if (ParseJingleVideoCodec(payload_elem, &codec)) {
AddFeedbackParams(content_feedback_params, &codec.feedback_params);
codec.preference = preference--;
video->AddCodec(codec);
}
}
if (!ParseJingleStreamsOrLegacySsrc(content_elem, video.get(), error)) {
return false;
}
ParseBandwidth(content_elem, video.get());
if (!ParseJingleEncryption(content_elem, video.get(), error)) {
return false;
}
video->set_rtcp_mux(content_elem->FirstNamed(QN_JINGLE_RTCP_MUX) != NULL);
RtpHeaderExtensions hdrexts;
if (!ParseJingleRtpHeaderExtensions(content_elem, &hdrexts, error)) {
return false;
}
video->set_rtp_header_extensions(hdrexts);
*content = video.release();
return true;
}
bool ParseJingleSctpDataContent(const buzz::XmlElement* content_elem,
ContentDescription** content,
ParseError* error) {
rtc::scoped_ptr<DataContentDescription> data(
new DataContentDescription());
data->set_protocol(kMediaProtocolSctp);
for (const buzz::XmlElement* stream_elem =
content_elem->FirstNamed(QN_JINGLE_DRAFT_SCTP_STREAM);
stream_elem != NULL;
stream_elem = stream_elem->NextNamed(QN_JINGLE_DRAFT_SCTP_STREAM)) {
StreamParams stream;
stream.groupid = stream_elem->Attr(QN_NICK);
stream.id = stream_elem->Attr(QN_NAME);
uint32 sid;
if (!rtc::FromString(stream_elem->Attr(QN_SID), &sid)) {
return BadParse("Missing or invalid sid.", error);
}
if (sid > kMaxSctpSid) {
return BadParse("SID is greater than max value.", error);
}
stream.ssrcs.push_back(sid);
data->mutable_streams().push_back(stream);
}
*content = data.release();
return true;
}
bool ParseJingleRtpDataContent(const buzz::XmlElement* content_elem,
ContentDescription** content,
ParseError* error) {
DataContentDescription* data = new DataContentDescription();
FeedbackParams content_feedback_params;
ParseFeedbackParams(content_elem, &content_feedback_params);
int preference = kMaxPayloadId;
for (const buzz::XmlElement* payload_elem =
content_elem->FirstNamed(QN_JINGLE_RTP_PAYLOADTYPE);
payload_elem != NULL;
payload_elem = payload_elem->NextNamed(QN_JINGLE_RTP_PAYLOADTYPE)) {
DataCodec codec;
if (ParseJingleDataCodec(payload_elem, &codec)) {
AddFeedbackParams(content_feedback_params, &codec.feedback_params);
codec.preference = preference--;
data->AddCodec(codec);
}
}
if (!ParseJingleStreamsOrLegacySsrc(content_elem, data, error)) {
return false;
}
ParseBandwidth(content_elem, data);
if (!ParseJingleEncryption(content_elem, data, error)) {
return false;
}
data->set_rtcp_mux(content_elem->FirstNamed(QN_JINGLE_RTCP_MUX) != NULL);
*content = data;
return true;
}
bool MediaSessionClient::ParseContent(SignalingProtocol protocol,
const buzz::XmlElement* content_elem,
ContentDescription** content,
ParseError* error) {
if (protocol == PROTOCOL_GINGLE) {
const std::string& content_type = content_elem->Name().Namespace();
if (NS_GINGLE_AUDIO == content_type) {
return ParseGingleAudioContent(content_elem, content, error);
} else if (NS_GINGLE_VIDEO == content_type) {
return ParseGingleVideoContent(content_elem, content, error);
} else {
return BadParse("Unknown content type: " + content_type, error);
}
} else {
const std::string& content_type = content_elem->Name().Namespace();
// We use the XMLNS of the <description> element to determine if
// it's RTP or SCTP.
if (content_type == NS_JINGLE_DRAFT_SCTP) {
return ParseJingleSctpDataContent(content_elem, content, error);
}
std::string media;
if (!RequireXmlAttr(content_elem, QN_JINGLE_CONTENT_MEDIA, &media, error))
return false;
if (media == JINGLE_CONTENT_MEDIA_AUDIO) {
return ParseJingleAudioContent(content_elem, content, error);
} else if (media == JINGLE_CONTENT_MEDIA_VIDEO) {
return ParseJingleVideoContent(content_elem, content, error);
} else if (media == JINGLE_CONTENT_MEDIA_DATA) {
return ParseJingleRtpDataContent(content_elem, content, error);
} else {
return BadParse("Unknown media: " + media, error);
}
}
}
buzz::XmlElement* CreateGingleAudioCodecElem(const AudioCodec& codec) {
buzz::XmlElement* payload_type =
new buzz::XmlElement(QN_GINGLE_AUDIO_PAYLOADTYPE, true);
AddXmlAttr(payload_type, QN_ID, codec.id);
payload_type->AddAttr(QN_NAME, codec.name);
if (codec.clockrate > 0)
AddXmlAttr(payload_type, QN_CLOCKRATE, codec.clockrate);
if (codec.bitrate > 0)
AddXmlAttr(payload_type, QN_BITRATE, codec.bitrate);
if (codec.channels > 1)
AddXmlAttr(payload_type, QN_CHANNELS, codec.channels);
return payload_type;
}
buzz::XmlElement* CreateGingleVideoCodecElem(const VideoCodec& codec) {
buzz::XmlElement* payload_type =
new buzz::XmlElement(QN_GINGLE_VIDEO_PAYLOADTYPE, true);
AddXmlAttr(payload_type, QN_ID, codec.id);
payload_type->AddAttr(QN_NAME, codec.name);
AddXmlAttr(payload_type, QN_WIDTH, codec.width);
AddXmlAttr(payload_type, QN_HEIGHT, codec.height);
AddXmlAttr(payload_type, QN_FRAMERATE, codec.framerate);
return payload_type;
}
buzz::XmlElement* CreateGingleSsrcElem(const buzz::QName& name, uint32 ssrc) {
buzz::XmlElement* elem = new buzz::XmlElement(name, true);
if (ssrc) {
SetXmlBody(elem, ssrc);
}
return elem;
}
buzz::XmlElement* CreateBandwidthElem(const buzz::QName& name, int bps) {
int kbps = bps / 1000;
buzz::XmlElement* elem = new buzz::XmlElement(name);
elem->AddAttr(buzz::QN_TYPE, "AS");
SetXmlBody(elem, kbps);
return elem;
}
// For Jingle, usage_qname is empty.
buzz::XmlElement* CreateJingleEncryptionElem(const CryptoParamsVec& cryptos,
bool required) {
buzz::XmlElement* encryption_elem = new buzz::XmlElement(QN_ENCRYPTION);
if (required) {
encryption_elem->SetAttr(QN_ENCRYPTION_REQUIRED, "true");
}
for (CryptoParamsVec::const_iterator i = cryptos.begin();
i != cryptos.end();
++i) {
buzz::XmlElement* crypto_elem = new buzz::XmlElement(QN_CRYPTO);
AddXmlAttr(crypto_elem, QN_CRYPTO_TAG, i->tag);
crypto_elem->AddAttr(QN_CRYPTO_SUITE, i->cipher_suite);
crypto_elem->AddAttr(QN_CRYPTO_KEY_PARAMS, i->key_params);
if (!i->session_params.empty()) {
crypto_elem->AddAttr(QN_CRYPTO_SESSION_PARAMS, i->session_params);
}
encryption_elem->AddElement(crypto_elem);
}
return encryption_elem;
}
buzz::XmlElement* CreateGingleEncryptionElem(const CryptoParamsVec& cryptos,
const buzz::QName& usage_qname,
bool required) {
buzz::XmlElement* encryption_elem =
CreateJingleEncryptionElem(cryptos, required);
if (required) {
encryption_elem->SetAttr(QN_ENCRYPTION_REQUIRED, "true");
}
buzz::XmlElement* usage_elem = new buzz::XmlElement(usage_qname);
encryption_elem->AddElement(usage_elem);
return encryption_elem;
}
buzz::XmlElement* CreateGingleAudioContentElem(
const AudioContentDescription* audio,
bool crypto_required) {
buzz::XmlElement* elem =
new buzz::XmlElement(QN_GINGLE_AUDIO_CONTENT, true);
for (AudioCodecs::const_iterator codec = audio->codecs().begin();
codec != audio->codecs().end(); ++codec) {
elem->AddElement(CreateGingleAudioCodecElem(*codec));
}
if (audio->has_ssrcs()) {
elem->AddElement(CreateGingleSsrcElem(
QN_GINGLE_AUDIO_SRCID, audio->first_ssrc()));
}
const CryptoParamsVec& cryptos = audio->cryptos();
if (!cryptos.empty()) {
elem->AddElement(CreateGingleEncryptionElem(cryptos,
QN_GINGLE_AUDIO_CRYPTO_USAGE,
crypto_required));
}
return elem;
}
buzz::XmlElement* CreateGingleVideoContentElem(
const VideoContentDescription* video,
bool crypto_required) {
buzz::XmlElement* elem =
new buzz::XmlElement(QN_GINGLE_VIDEO_CONTENT, true);
for (VideoCodecs::const_iterator codec = video->codecs().begin();
codec != video->codecs().end(); ++codec) {
elem->AddElement(CreateGingleVideoCodecElem(*codec));
}
if (video->has_ssrcs()) {
elem->AddElement(CreateGingleSsrcElem(
QN_GINGLE_VIDEO_SRCID, video->first_ssrc()));
}
if (video->bandwidth() != kAutoBandwidth) {
elem->AddElement(CreateBandwidthElem(QN_GINGLE_VIDEO_BANDWIDTH,
video->bandwidth()));
}
const CryptoParamsVec& cryptos = video->cryptos();
if (!cryptos.empty()) {
elem->AddElement(CreateGingleEncryptionElem(cryptos,
QN_GINGLE_VIDEO_CRYPTO_USAGE,
crypto_required));
}
return elem;
}
template <class T>
buzz::XmlElement* CreatePayloadTypeParameterElem(
const std::string& name, T value) {
buzz::XmlElement* elem = new buzz::XmlElement(QN_PARAMETER);
elem->AddAttr(QN_PAYLOADTYPE_PARAMETER_NAME, name);
AddXmlAttr(elem, QN_PAYLOADTYPE_PARAMETER_VALUE, value);
return elem;
}
void AddRtcpFeedbackElem(buzz::XmlElement* elem,
const FeedbackParams& feedback_params) {
std::vector<FeedbackParam>::const_iterator it;
for (it = feedback_params.params().begin();
it != feedback_params.params().end(); ++it) {
buzz::XmlElement* fb_elem = new buzz::XmlElement(QN_JINGLE_RTCP_FB);
fb_elem->AddAttr(QN_TYPE, it->id());
fb_elem->AddAttr(QN_SUBTYPE, it->param());
elem->AddElement(fb_elem);
}
}
buzz::XmlElement* CreateJingleAudioCodecElem(const AudioCodec& codec) {
buzz::XmlElement* elem = new buzz::XmlElement(QN_JINGLE_RTP_PAYLOADTYPE);
AddXmlAttr(elem, QN_ID, codec.id);
elem->AddAttr(QN_NAME, codec.name);
if (codec.clockrate > 0) {
AddXmlAttr(elem, QN_CLOCKRATE, codec.clockrate);
}
if (codec.bitrate > 0) {
elem->AddElement(CreatePayloadTypeParameterElem(
PAYLOADTYPE_PARAMETER_BITRATE, codec.bitrate));
}
if (codec.channels > 1) {
AddXmlAttr(elem, QN_CHANNELS, codec.channels);
}
AddRtcpFeedbackElem(elem, codec.feedback_params);
return elem;
}
buzz::XmlElement* CreateJingleVideoCodecElem(const VideoCodec& codec) {
buzz::XmlElement* elem = new buzz::XmlElement(QN_JINGLE_RTP_PAYLOADTYPE);
AddXmlAttr(elem, QN_ID, codec.id);
elem->AddAttr(QN_NAME, codec.name);
elem->AddElement(CreatePayloadTypeParameterElem(
PAYLOADTYPE_PARAMETER_WIDTH, codec.width));
elem->AddElement(CreatePayloadTypeParameterElem(
PAYLOADTYPE_PARAMETER_HEIGHT, codec.height));
elem->AddElement(CreatePayloadTypeParameterElem(
PAYLOADTYPE_PARAMETER_FRAMERATE, codec.framerate));
AddRtcpFeedbackElem(elem, codec.feedback_params);
CodecParameterMap::const_iterator param_iter;
for (param_iter = codec.params.begin(); param_iter != codec.params.end();
++param_iter) {
elem->AddElement(CreatePayloadTypeParameterElem(param_iter->first,
param_iter->second));
}
return elem;
}
buzz::XmlElement* CreateJingleDataCodecElem(const DataCodec& codec) {
buzz::XmlElement* elem = new buzz::XmlElement(QN_JINGLE_RTP_PAYLOADTYPE);
AddXmlAttr(elem, QN_ID, codec.id);
elem->AddAttr(QN_NAME, codec.name);
AddRtcpFeedbackElem(elem, codec.feedback_params);
return elem;
}
void WriteLegacyJingleSsrc(const MediaContentDescription* media,
buzz::XmlElement* elem) {
if (media->has_ssrcs()) {
AddXmlAttr(elem, QN_SSRC, media->first_ssrc());
}
}
void WriteJingleStreamsOrLegacySsrc(const MediaContentDescription* media,
buzz::XmlElement* desc_elem) {
if (!media->multistream()) {
WriteLegacyJingleSsrc(media, desc_elem);
} else {
WriteJingleStreams(media->streams(), desc_elem);
}
}
buzz::XmlElement* CreateJingleAudioContentElem(
const AudioContentDescription* audio, bool crypto_required) {
buzz::XmlElement* elem =
new buzz::XmlElement(QN_JINGLE_RTP_CONTENT, true);
elem->SetAttr(QN_JINGLE_CONTENT_MEDIA, JINGLE_CONTENT_MEDIA_AUDIO);
WriteJingleStreamsOrLegacySsrc(audio, elem);
for (AudioCodecs::const_iterator codec = audio->codecs().begin();
codec != audio->codecs().end(); ++codec) {
elem->AddElement(CreateJingleAudioCodecElem(*codec));
}
const CryptoParamsVec& cryptos = audio->cryptos();
if (!cryptos.empty()) {
elem->AddElement(CreateJingleEncryptionElem(cryptos, crypto_required));
}
if (audio->rtcp_mux()) {
elem->AddElement(new buzz::XmlElement(QN_JINGLE_RTCP_MUX));
}
WriteJingleRtpHeaderExtensions(audio->rtp_header_extensions(), elem);
return elem;
}
buzz::XmlElement* CreateJingleVideoContentElem(
const VideoContentDescription* video, bool crypto_required) {
buzz::XmlElement* elem =
new buzz::XmlElement(QN_JINGLE_RTP_CONTENT, true);
elem->SetAttr(QN_JINGLE_CONTENT_MEDIA, JINGLE_CONTENT_MEDIA_VIDEO);
WriteJingleStreamsOrLegacySsrc(video, elem);
for (VideoCodecs::const_iterator codec = video->codecs().begin();
codec != video->codecs().end(); ++codec) {
elem->AddElement(CreateJingleVideoCodecElem(*codec));
}
const CryptoParamsVec& cryptos = video->cryptos();
if (!cryptos.empty()) {
elem->AddElement(CreateJingleEncryptionElem(cryptos, crypto_required));
}
if (video->rtcp_mux()) {
elem->AddElement(new buzz::XmlElement(QN_JINGLE_RTCP_MUX));
}
if (video->bandwidth() != kAutoBandwidth) {
elem->AddElement(CreateBandwidthElem(QN_JINGLE_RTP_BANDWIDTH,
video->bandwidth()));
}
WriteJingleRtpHeaderExtensions(video->rtp_header_extensions(), elem);
return elem;
}
buzz::XmlElement* CreateJingleSctpDataContentElem(
const DataContentDescription* data) {
buzz::XmlElement* content_elem =
new buzz::XmlElement(QN_JINGLE_DRAFT_SCTP_CONTENT, true);
for (std::vector<StreamParams>::const_iterator
stream = data->streams().begin();
stream != data->streams().end(); ++stream) {
buzz::XmlElement* stream_elem =
new buzz::XmlElement(QN_JINGLE_DRAFT_SCTP_STREAM, false);
AddXmlAttrIfNonEmpty(stream_elem, QN_NICK, stream->groupid);
AddXmlAttrIfNonEmpty(stream_elem, QN_NAME, stream->id);
if (!stream->ssrcs.empty()) {
AddXmlAttr(stream_elem, QN_SID, stream->ssrcs[0]);
}
content_elem->AddElement(stream_elem);
}
return content_elem;;
}
buzz::XmlElement* CreateJingleRtpDataContentElem(
const DataContentDescription* data, bool crypto_required) {
buzz::XmlElement* elem =
new buzz::XmlElement(QN_JINGLE_RTP_CONTENT, true);
elem->SetAttr(QN_JINGLE_CONTENT_MEDIA, JINGLE_CONTENT_MEDIA_DATA);
WriteJingleStreamsOrLegacySsrc(data, elem);
for (DataCodecs::const_iterator codec = data->codecs().begin();
codec != data->codecs().end(); ++codec) {
elem->AddElement(CreateJingleDataCodecElem(*codec));
}
const CryptoParamsVec& cryptos = data->cryptos();
if (!cryptos.empty()) {
elem->AddElement(CreateJingleEncryptionElem(cryptos, crypto_required));
}
if (data->rtcp_mux()) {
elem->AddElement(new buzz::XmlElement(QN_JINGLE_RTCP_MUX));
}
if (data->bandwidth() != kAutoBandwidth) {
elem->AddElement(CreateBandwidthElem(QN_JINGLE_RTP_BANDWIDTH,
data->bandwidth()));
}
return elem;
}
bool IsSctp(const DataContentDescription* data) {
return (data->protocol() == kMediaProtocolSctp ||
data->protocol() == kMediaProtocolDtlsSctp);
}
buzz::XmlElement* CreateJingleDataContentElem(
const DataContentDescription* data, bool crypto_required) {
if (IsSctp(data)) {
return CreateJingleSctpDataContentElem(data);
} else {
return CreateJingleRtpDataContentElem(data, crypto_required);
}
}
bool MediaSessionClient::IsWritable(SignalingProtocol protocol,
const ContentDescription* content) {
const MediaContentDescription* media =
static_cast<const MediaContentDescription*>(content);
if (protocol == PROTOCOL_GINGLE &&
media->type() == MEDIA_TYPE_DATA) {
return false;
}
return true;
}
bool MediaSessionClient::WriteContent(SignalingProtocol protocol,
const ContentDescription* content,
buzz::XmlElement** elem,
WriteError* error) {
const MediaContentDescription* media =
static_cast<const MediaContentDescription*>(content);
bool crypto_required = secure() == SEC_REQUIRED;
if (media->type() == MEDIA_TYPE_AUDIO) {
const AudioContentDescription* audio =
static_cast<const AudioContentDescription*>(media);
if (protocol == PROTOCOL_GINGLE) {
*elem = CreateGingleAudioContentElem(audio, crypto_required);
} else {
*elem = CreateJingleAudioContentElem(audio, crypto_required);
}
} else if (media->type() == MEDIA_TYPE_VIDEO) {
const VideoContentDescription* video =
static_cast<const VideoContentDescription*>(media);
if (protocol == PROTOCOL_GINGLE) {
*elem = CreateGingleVideoContentElem(video, crypto_required);
} else {
*elem = CreateJingleVideoContentElem(video, crypto_required);
}
} else if (media->type() == MEDIA_TYPE_DATA) {
const DataContentDescription* data =
static_cast<const DataContentDescription*>(media);
if (protocol == PROTOCOL_GINGLE) {
return BadWrite("Data channel not supported with Gingle.", error);
} else {
*elem = CreateJingleDataContentElem(data, crypto_required);
}
} else {
return BadWrite("Unknown content type: " +
rtc::ToString<int>(media->type()), error);
}
return true;
}
} // namespace cricket