text: /*
   * libjingle
   * Copyright 2011 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 "media/base/streamparams.h"
  
  #include <sstream>
  
  namespace cricket {
  
  const char kFecSsrcGroupSemantics[] = "FEC";
  const char kFidSsrcGroupSemantics[] = "FID";
  
  static std::string SsrcsToString(const std::vector<uint32>& ssrcs) {
    std::ostringstream ost;
    ost << "ssrcs:[";
    for (std::vector<uint32>::const_iterator it = ssrcs.begin();
         it != ssrcs.end(); ++it) {
      if (it != ssrcs.begin()) {
        ost << ",";
      }
      ost << *it;
    }
    ost << "]";
    return ost.str();
  }
  
  bool SsrcGroup::has_semantics(const std::string& semantics_in) const {
    return (semantics == semantics_in && ssrcs.size() > 0);
  }
  
  std::string SsrcGroup::ToString() const {
    std::ostringstream ost;
    ost << "{";
    ost << "semantics:" << semantics << ";";
    ost << SsrcsToString(ssrcs);
    ost << "}";
    return ost.str();
  }
  
  std::string StreamParams::ToString() const {
    std::ostringstream ost;
    ost << "{";
    if (!nick.empty()) {
      ost << "nick:" << nick << ";";
    }
    if (!name.empty()) {
      ost << "name:" << name << ";";
    }
    ost << SsrcsToString(ssrcs) << ";";
    ost << "ssrc_groups:";
    for (std::vector<SsrcGroup>::const_iterator it = ssrc_groups.begin();
         it != ssrc_groups.end(); ++it) {
      if (it != ssrc_groups.begin()) {
        ost << ",";
      }
      ost << it->ToString();
    }
    ost << ";";
    if (!type.empty()) {
      ost << "type:" << type << ";";
    }
    if (!display.empty()) {
      ost << "display:" << display << ";";
    }
    if (!cname.empty()) {
      ost << "cname:" << cname << ";";
    }
    if (!sync_label.empty()) {
      ost << "sync_label:" << sync_label;
    }
    ost << "}";
    return ost.str();
  }
  
  bool StreamParams::AddSecondarySsrc(const std::string& semantics,
                                      uint32 primary_ssrc,
                                      uint32 secondary_ssrc) {
    if (!has_ssrc(primary_ssrc)) {
      return false;
    }
  
    ssrcs.push_back(secondary_ssrc);
    std::vector<uint32> ssrc_vector;
    ssrc_vector.push_back(primary_ssrc);
    ssrc_vector.push_back(secondary_ssrc);
    SsrcGroup ssrc_group = SsrcGroup(semantics, ssrc_vector);
    ssrc_groups.push_back(ssrc_group);
    return true;
  }
  
  bool StreamParams::GetSecondarySsrc(const std::string& semantics,
                                      uint32 primary_ssrc,
                                      uint32* secondary_ssrc) const {
    for (std::vector<SsrcGroup>::const_iterator it = ssrc_groups.begin();
         it != ssrc_groups.end(); ++it) {
      if (it->has_semantics(semantics) &&
            it->ssrcs.size() >= 2 &&
            it->ssrcs[0] == primary_ssrc) {
        *secondary_ssrc = it->ssrcs[1];
        return true;
      }
    }
    return false;
  }
  
  bool GetStreamBySsrc(const StreamParamsVec& streams, uint32 ssrc,
                       StreamParams* stream_out) {
    for (StreamParamsVec::const_iterator stream = streams.begin();
         stream != streams.end(); ++stream) {
      if (stream->has_ssrc(ssrc)) {
        if (stream_out != NULL)
          *stream_out = *stream;
        return true;
      }
    }
    return false;
  }
  
  bool GetStreamByNickAndName(const StreamParamsVec& streams,
                              const std::string& nick,
                              const std::string& name,
                              StreamParams* stream_out) {
    for (StreamParamsVec::const_iterator stream = streams.begin();
         stream != streams.end(); ++stream) {
      if (stream->nick == nick && stream->name == name) {
        if (stream_out != NULL)
          *stream_out = *stream;
        return true;
      }
    }
    return false;
  }
  
  bool RemoveStreamBySsrc(StreamParamsVec* streams, uint32 ssrc) {
    bool ret = false;
    for (StreamParamsVec::iterator stream = streams->begin();
         stream != streams->end(); ) {
      if (stream->has_ssrc(ssrc)) {
        stream = streams->erase(stream);
        ret = true;
      } else {
        ++stream;
      }
    }
    return ret;
  }
  
  bool RemoveStreamByNickAndName(StreamParamsVec* streams,
                                 const std::string& nick,
                                 const std::string& name) {
    bool ret = false;
    for (StreamParamsVec::iterator stream = streams->begin();
         stream != streams->end(); ) {
      if (stream->nick == nick && stream->name == name) {
        stream = streams->erase(stream);
        ret = true;
      } else {
        ++stream;
      }
    }
    return ret;
  }
  
  }  // namespace cricket
  