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/*
* libjingle
* Copyright 2010 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.
*/
/*
* A collection of functions and types for serializing and
* deserializing Jingle session messages related to media.
* Specificially, the <notify> and <view> messages. They are not yet
* standardized, but their current documentation can be found at:
* goto/jinglemuc
*/
#ifndef TALK_SESSION_MEDIA_MEDIAMESSAGES_H_
#define TALK_SESSION_MEDIA_MEDIAMESSAGES_H_
#include <string>
#include <vector>
#include "talk/media/base/mediachannel.h" // For RtpHeaderExtension
#include "talk/media/base/streamparams.h"
#include "webrtc/libjingle/session/parsing.h"
#include "webrtc/p2p/base/sessiondescription.h"
#include "webrtc/base/basictypes.h"
namespace cricket {
// A collection of audio and video and data streams. Most of the
// methods are merely for convenience. Many of these methods are keyed
// by ssrc, which is the source identifier in the RTP spec
// (http://tools.ietf.org/html/rfc3550).
struct MediaStreams {
public:
MediaStreams() {}
void CopyFrom(const MediaStreams& sources);
bool empty() const {
return audio_.empty() && video_.empty() && data_.empty();
}
std::vector<StreamParams>* mutable_audio() { return &audio_; }
std::vector<StreamParams>* mutable_video() { return &video_; }
std::vector<StreamParams>* mutable_data() { return &data_; }
const std::vector<StreamParams>& audio() const { return audio_; }
const std::vector<StreamParams>& video() const { return video_; }
const std::vector<StreamParams>& data() const { return data_; }
// Gets a stream, returning true if found.
bool GetAudioStream(
const StreamSelector& selector, StreamParams* stream);
bool GetVideoStream(
const StreamSelector& selector, StreamParams* stream);
bool GetDataStream(
const StreamSelector& selector, StreamParams* stream);
// Adds a stream.
void AddAudioStream(const StreamParams& stream);
void AddVideoStream(const StreamParams& stream);
void AddDataStream(const StreamParams& stream);
// Removes a stream, returning true if found and removed.
bool RemoveAudioStream(const StreamSelector& selector);
bool RemoveVideoStream(const StreamSelector& selector);
bool RemoveDataStream(const StreamSelector& selector);
private:
std::vector<StreamParams> audio_;
std::vector<StreamParams> video_;
std::vector<StreamParams> data_;
DISALLOW_COPY_AND_ASSIGN(MediaStreams);
};
// In a <view> message, there are a number of views specified. This
// represents one such view. We currently only support "static"
// views.
struct StaticVideoView {
StaticVideoView(const StreamSelector& selector,
int width, int height, int framerate)
: selector(selector),
width(width),
height(height),
framerate(framerate),
preference(0) {
}
StreamSelector selector;
int width;
int height;
int framerate;
int preference;
};
typedef std::vector<StaticVideoView> StaticVideoViews;
// Represents a whole view request message, which contains many views.
struct ViewRequest {
StaticVideoViews static_video_views;
};
// If the parent element (usually <jingle>) is a jingle view.
bool IsJingleViewRequest(const buzz::XmlElement* action_elem);
// Parses a view request from the parent element (usually
// <jingle>). If it fails, it returns false and fills an error
// message.
bool ParseJingleViewRequest(const buzz::XmlElement* action_elem,
ViewRequest* view_request,
ParseError* error);
// Serializes a view request to XML. If it fails, returns false and
// fills in an error message.
bool WriteJingleViewRequest(const std::string& content_name,
const ViewRequest& view,
XmlElements* elems,
WriteError* error);
// TODO(pthatcher): Get rid of legacy source notify and replace with
// description-info as soon as reflector is capable of sending it.
bool IsSourcesNotify(const buzz::XmlElement* action_elem);
// If the given elem has <streams>.
bool HasJingleStreams(const buzz::XmlElement* desc_elem);
// Parses streams from a jingle <description>. If it fails, returns
// false and fills an error message.
bool ParseJingleStreams(const buzz::XmlElement* desc_elem,
std::vector<StreamParams>* streams,
ParseError* error);
// Write a <streams> element to the parent_elem.
void WriteJingleStreams(const std::vector<StreamParams>& streams,
buzz::XmlElement* parent_elem);
// Parses rtp header extensions from a jingle <description>. If it
// fails, returns false and fills an error message.
bool ParseJingleRtpHeaderExtensions(
const buzz::XmlElement* desc_elem,
std::vector<RtpHeaderExtension>* hdrexts,
ParseError* error);
// Writes <rtp-hdrext> elements to the parent_elem.
void WriteJingleRtpHeaderExtensions(
const std::vector<RtpHeaderExtension>& hdrexts,
buzz::XmlElement* parent_elem);
} // namespace cricket
#endif // TALK_SESSION_MEDIA_MEDIAMESSAGES_H_
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