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/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
// This file contains structures for describing SSRCs from a media source such
// as a MediaStreamTrack when it is sent across an RTP session. Multiple media
// sources may be sent across the same RTP session, each of them will be
// described by one StreamParams object
// SsrcGroup is used to describe the relationship between the SSRCs that
// are used for this media source.
// E.x: Consider a source that is sent as 3 simulcast streams
// Let the simulcast elements have SSRC 10, 20, 30.
// Let each simulcast element use FEC and let the protection packets have
// SSRC 11,21,31.
// To describe this 4 SsrcGroups are needed,
// StreamParams would then contain ssrc = {10,11,20,21,30,31} and
// ssrc_groups = {{SIM,{10,20,30}, {FEC,{10,11}, {FEC, {20,21}, {FEC {30,31}}}
// Please see RFC 5576.
#ifndef WEBRTC_MEDIA_BASE_STREAMPARAMS_H_
#define WEBRTC_MEDIA_BASE_STREAMPARAMS_H_
#include <algorithm>
#include <set>
#include <string>
#include <vector>
#include "webrtc/base/basictypes.h"
#include "webrtc/base/constructormagic.h"
namespace cricket {
extern const char kFecSsrcGroupSemantics[];
extern const char kFidSsrcGroupSemantics[];
extern const char kSimSsrcGroupSemantics[];
struct SsrcGroup {
SsrcGroup(const std::string& usage, const std::vector<uint32_t>& ssrcs)
: semantics(usage), ssrcs(ssrcs) {}
bool operator==(const SsrcGroup& other) const {
return (semantics == other.semantics && ssrcs == other.ssrcs);
}
bool operator!=(const SsrcGroup &other) const {
return !(*this == other);
}
bool has_semantics(const std::string& semantics) const;
std::string ToString() const;
std::string semantics; // e.g FIX, FEC, SIM.
std::vector<uint32_t> ssrcs; // SSRCs of this type.
};
struct StreamParams {
static StreamParams CreateLegacy(uint32_t ssrc) {
StreamParams stream;
stream.ssrcs.push_back(ssrc);
return stream;
}
bool operator==(const StreamParams& other) const {
return (groupid == other.groupid &&
id == other.id &&
ssrcs == other.ssrcs &&
ssrc_groups == other.ssrc_groups &&
type == other.type &&
display == other.display &&
cname == other.cname &&
sync_label == other.sync_label);
}
bool operator!=(const StreamParams &other) const {
return !(*this == other);
}
uint32_t first_ssrc() const {
if (ssrcs.empty()) {
return 0;
}
return ssrcs[0];
}
bool has_ssrcs() const {
return !ssrcs.empty();
}
bool has_ssrc(uint32_t ssrc) const {
return std::find(ssrcs.begin(), ssrcs.end(), ssrc) != ssrcs.end();
}
void add_ssrc(uint32_t ssrc) { ssrcs.push_back(ssrc); }
bool has_ssrc_groups() const {
return !ssrc_groups.empty();
}
bool has_ssrc_group(const std::string& semantics) const {
return (get_ssrc_group(semantics) != NULL);
}
const SsrcGroup* get_ssrc_group(const std::string& semantics) const {
for (std::vector<SsrcGroup>::const_iterator it = ssrc_groups.begin();
it != ssrc_groups.end(); ++it) {
if (it->has_semantics(semantics)) {
return &(*it);
}
}
return NULL;
}
// Convenience function to add an FID ssrc for a primary_ssrc
// that's already been added.
inline bool AddFidSsrc(uint32_t primary_ssrc, uint32_t fid_ssrc) {
return AddSecondarySsrc(kFidSsrcGroupSemantics, primary_ssrc, fid_ssrc);
}
// Convenience function to lookup the FID ssrc for a primary_ssrc.
// Returns false if primary_ssrc not found or FID not defined for it.
inline bool GetFidSsrc(uint32_t primary_ssrc, uint32_t* fid_ssrc) const {
return GetSecondarySsrc(kFidSsrcGroupSemantics, primary_ssrc, fid_ssrc);
}
// Convenience to get all the SIM SSRCs if there are SIM ssrcs, or
// the first SSRC otherwise.
void GetPrimarySsrcs(std::vector<uint32_t>* ssrcs) const;
// Convenience to get all the FID SSRCs for the given primary ssrcs.
// If a given primary SSRC does not have a FID SSRC, the list of FID
// SSRCS will be smaller than the list of primary SSRCs.
void GetFidSsrcs(const std::vector<uint32_t>& primary_ssrcs,
std::vector<uint32_t>* fid_ssrcs) const;
std::string ToString() const;
// Resource of the MUC jid of the participant of with this stream.
// For 1:1 calls, should be left empty (which means remote streams
// and local streams should not be mixed together).
std::string groupid;
// Unique per-groupid, not across all groupids
std::string id;
std::vector<uint32_t> ssrcs; // All SSRCs for this source
std::vector<SsrcGroup> ssrc_groups; // e.g. FID, FEC, SIM
// Examples: "camera", "screencast"
std::string type;
// Friendly name describing stream
std::string display;
std::string cname; // RTCP CNAME
std::string sync_label; // Friendly name of cname.
private:
bool AddSecondarySsrc(const std::string& semantics,
uint32_t primary_ssrc,
uint32_t secondary_ssrc);
bool GetSecondarySsrc(const std::string& semantics,
uint32_t primary_ssrc,
uint32_t* secondary_ssrc) const;
};
// A Stream can be selected by either groupid+id or ssrc.
struct StreamSelector {
explicit StreamSelector(uint32_t ssrc) : ssrc(ssrc) {}
StreamSelector(const std::string& groupid,
const std::string& streamid) :
ssrc(0),
groupid(groupid),
streamid(streamid) {
}
bool Matches(const StreamParams& stream) const {
if (ssrc == 0) {
return stream.groupid == groupid && stream.id == streamid;
} else {
return stream.has_ssrc(ssrc);
}
}
uint32_t ssrc;
std::string groupid;
std::string streamid;
};
typedef std::vector<StreamParams> StreamParamsVec;
// 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).
// TODO(pthatcher): Add basic unit test for these.
// See https://code.google.com/p/webrtc/issues/detail?id=4107
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_;
RTC_DISALLOW_COPY_AND_ASSIGN(MediaStreams);
};
template <class Condition>
const StreamParams* GetStream(const StreamParamsVec& streams,
Condition condition) {
StreamParamsVec::const_iterator found =
std::find_if(streams.begin(), streams.end(), condition);
return found == streams.end() ? nullptr : &(*found);
}
inline const StreamParams* GetStreamBySsrc(const StreamParamsVec& streams,
uint32_t ssrc) {
return GetStream(streams,
[&ssrc](const StreamParams& sp) { return sp.has_ssrc(ssrc); });
}
inline const StreamParams* GetStreamByIds(const StreamParamsVec& streams,
const std::string& groupid,
const std::string& id) {
return GetStream(streams,
[&groupid, &id](const StreamParams& sp) {
return sp.groupid == groupid && sp.id == id;
});
}
inline const StreamParams* GetStream(const StreamParamsVec& streams,
const StreamSelector& selector) {
return GetStream(streams,
[&selector](const StreamParams& sp) { return selector.Matches(sp); });
}
template <class Condition>
bool RemoveStream(StreamParamsVec* streams, Condition condition) {
auto iter(std::remove_if(streams->begin(), streams->end(), condition));
if (iter == streams->end())
return false;
streams->erase(iter, streams->end());
return true;
}
// Removes the stream from streams. Returns true if a stream is
// found and removed.
inline bool RemoveStream(StreamParamsVec* streams,
const StreamSelector& selector) {
return RemoveStream(streams,
[&selector](const StreamParams& sp) { return selector.Matches(sp); });
}
inline bool RemoveStreamBySsrc(StreamParamsVec* streams, uint32_t ssrc) {
return RemoveStream(streams,
[&ssrc](const StreamParams& sp) { return sp.has_ssrc(ssrc); });
}
inline bool RemoveStreamByIds(StreamParamsVec* streams,
const std::string& groupid,
const std::string& id) {
return RemoveStream(streams,
[&groupid, &id](const StreamParams& sp) {
return sp.groupid == groupid && sp.id == id;
});
}
// Checks if |sp| defines parameters for a single primary stream. There may
// be an RTX stream associated with the primary stream. Leaving as non-static so
// we can test this function.
bool IsOneSsrcStream(const StreamParams& sp);
// Checks if |sp| defines parameters for one Simulcast stream. There may be RTX
// streams associated with the simulcast streams. Leaving as non-static so we
// can test this function.
bool IsSimulcastStream(const StreamParams& sp);
} // namespace cricket
#endif // WEBRTC_MEDIA_BASE_STREAMPARAMS_H_