a09a99950e
git-svn-id: http://webrtc.googlecode.com/svn/trunk@6891 4adac7df-926f-26a2-2b94-8c16560cd09d
239 lines
8.3 KiB
C++
239 lines
8.3 KiB
C++
/*
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* libjingle
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* Copyright 2011 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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// This file contains structures for describing SSRCs from a media source such
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// as a MediaStreamTrack when it is sent across an RTP session. Multiple media
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// sources may be sent across the same RTP session, each of them will be
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// described by one StreamParams object
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// SsrcGroup is used to describe the relationship between the SSRCs that
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// are used for this media source.
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// E.x: Consider a source that is sent as 3 simulcast streams
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// Let the simulcast elements have SSRC 10, 20, 30.
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// Let each simulcast element use FEC and let the protection packets have
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// SSRC 11,21,31.
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// To describe this 4 SsrcGroups are needed,
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// StreamParams would then contain ssrc = {10,11,20,21,30,31} and
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// ssrc_groups = {{SIM,{10,20,30}, {FEC,{10,11}, {FEC, {20,21}, {FEC {30,31}}}
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// Please see RFC 5576.
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#ifndef TALK_MEDIA_BASE_STREAMPARAMS_H_
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#define TALK_MEDIA_BASE_STREAMPARAMS_H_
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#include <algorithm>
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#include <set>
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#include <string>
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#include <vector>
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#include "webrtc/base/basictypes.h"
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namespace cricket {
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extern const char kFecSsrcGroupSemantics[];
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extern const char kFidSsrcGroupSemantics[];
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extern const char kSimSsrcGroupSemantics[];
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struct SsrcGroup {
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SsrcGroup(const std::string& usage, const std::vector<uint32>& ssrcs)
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: semantics(usage), ssrcs(ssrcs) {
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}
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bool operator==(const SsrcGroup& other) const {
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return (semantics == other.semantics && ssrcs == other.ssrcs);
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}
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bool operator!=(const SsrcGroup &other) const {
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return !(*this == other);
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}
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bool has_semantics(const std::string& semantics) const;
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std::string ToString() const;
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std::string semantics; // e.g FIX, FEC, SIM.
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std::vector<uint32> ssrcs; // SSRCs of this type.
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};
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struct StreamParams {
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static StreamParams CreateLegacy(uint32 ssrc) {
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StreamParams stream;
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stream.ssrcs.push_back(ssrc);
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return stream;
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}
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bool operator==(const StreamParams& other) const {
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return (groupid == other.groupid &&
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id == other.id &&
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ssrcs == other.ssrcs &&
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ssrc_groups == other.ssrc_groups &&
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type == other.type &&
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display == other.display &&
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cname == other.cname &&
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sync_label == other.sync_label);
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}
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bool operator!=(const StreamParams &other) const {
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return !(*this == other);
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}
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uint32 first_ssrc() const {
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if (ssrcs.empty()) {
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return 0;
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}
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return ssrcs[0];
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}
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bool has_ssrcs() const {
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return !ssrcs.empty();
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}
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bool has_ssrc(uint32 ssrc) const {
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return std::find(ssrcs.begin(), ssrcs.end(), ssrc) != ssrcs.end();
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}
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void add_ssrc(uint32 ssrc) {
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ssrcs.push_back(ssrc);
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}
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bool has_ssrc_groups() const {
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return !ssrc_groups.empty();
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}
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bool has_ssrc_group(const std::string& semantics) const {
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return (get_ssrc_group(semantics) != NULL);
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}
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const SsrcGroup* get_ssrc_group(const std::string& semantics) const {
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for (std::vector<SsrcGroup>::const_iterator it = ssrc_groups.begin();
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it != ssrc_groups.end(); ++it) {
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if (it->has_semantics(semantics)) {
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return &(*it);
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}
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}
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return NULL;
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}
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// Convenience function to add an FID ssrc for a primary_ssrc
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// that's already been added.
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inline bool AddFidSsrc(uint32 primary_ssrc, uint32 fid_ssrc) {
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return AddSecondarySsrc(kFidSsrcGroupSemantics, primary_ssrc, fid_ssrc);
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}
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// Convenience function to lookup the FID ssrc for a primary_ssrc.
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// Returns false if primary_ssrc not found or FID not defined for it.
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inline bool GetFidSsrc(uint32 primary_ssrc, uint32* fid_ssrc) const {
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return GetSecondarySsrc(kFidSsrcGroupSemantics, primary_ssrc, fid_ssrc);
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}
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// Convenience to get all the SIM SSRCs if there are SIM ssrcs, or
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// the first SSRC otherwise.
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void GetPrimarySsrcs(std::vector<uint32>* ssrcs) const;
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// Convenience to get all the FID SSRCs for the given primary ssrcs.
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// If a given primary SSRC does not have a FID SSRC, the list of FID
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// SSRCS will be smaller than the list of primary SSRCs.
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void GetFidSsrcs(const std::vector<uint32>& primary_ssrcs,
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std::vector<uint32>* fid_ssrcs) const;
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std::string ToString() const;
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// Resource of the MUC jid of the participant of with this stream.
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// For 1:1 calls, should be left empty (which means remote streams
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// and local streams should not be mixed together).
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std::string groupid;
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// Unique per-groupid, not across all groupids
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std::string id;
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std::vector<uint32> ssrcs; // All SSRCs for this source
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std::vector<SsrcGroup> ssrc_groups; // e.g. FID, FEC, SIM
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// Examples: "camera", "screencast"
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std::string type;
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// Friendly name describing stream
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std::string display;
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std::string cname; // RTCP CNAME
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std::string sync_label; // Friendly name of cname.
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private:
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bool AddSecondarySsrc(const std::string& semantics, uint32 primary_ssrc,
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uint32 secondary_ssrc);
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bool GetSecondarySsrc(const std::string& semantics, uint32 primary_ssrc,
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uint32* secondary_ssrc) const;
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};
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// A Stream can be selected by either groupid+id or ssrc.
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struct StreamSelector {
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explicit StreamSelector(uint32 ssrc) :
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ssrc(ssrc) {
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}
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StreamSelector(const std::string& groupid,
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const std::string& streamid) :
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ssrc(0),
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groupid(groupid),
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streamid(streamid) {
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}
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bool Matches(const StreamParams& stream) const {
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if (ssrc == 0) {
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return stream.groupid == groupid && stream.id == streamid;
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} else {
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return stream.has_ssrc(ssrc);
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}
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}
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uint32 ssrc;
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std::string groupid;
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std::string streamid;
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};
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typedef std::vector<StreamParams> StreamParamsVec;
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// Finds the stream in streams. Returns true if found.
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bool GetStream(const StreamParamsVec& streams,
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const StreamSelector& selector,
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StreamParams* stream_out);
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bool GetStreamBySsrc(const StreamParamsVec& streams, uint32 ssrc,
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StreamParams* stream_out);
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bool GetStreamByIds(const StreamParamsVec& streams,
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const std::string& groupid,
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const std::string& id,
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StreamParams* stream_out);
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// Removes the stream from streams. Returns true if a stream is
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// found and removed.
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bool RemoveStream(StreamParamsVec* streams,
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const StreamSelector& selector);
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bool RemoveStreamBySsrc(StreamParamsVec* streams, uint32 ssrc);
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bool RemoveStreamByIds(StreamParamsVec* streams,
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const std::string& groupid,
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const std::string& id);
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// Checks if |sp| defines parameters for a single primary stream. There may
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// be an RTX stream associated with the primary stream. Leaving as non-static so
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// we can test this function.
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bool IsOneSsrcStream(const StreamParams& sp);
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// Checks if |sp| defines parameters for one Simulcast stream. There may be RTX
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// streams associated with the simulcast streams. Leaving as non-static so we
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// can test this function.
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bool IsSimulcastStream(const StreamParams& sp);
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} // namespace cricket
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#endif // TALK_MEDIA_BASE_STREAMPARAMS_H_
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