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      1 /*
      2  * libjingle
      3  * Copyright 2011 Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include "talk/media/base/streamparams.h"
     29 
     30 #include <list>
     31 #include <sstream>
     32 
     33 namespace cricket {
     34 namespace {
     35 // NOTE: There is no check here for duplicate streams, so check before
     36 // adding.
     37 void AddStream(std::vector<StreamParams>* streams, const StreamParams& stream) {
     38   streams->push_back(stream);
     39 }
     40 }
     41 
     42 const char kFecSsrcGroupSemantics[] = "FEC";
     43 const char kFidSsrcGroupSemantics[] = "FID";
     44 const char kSimSsrcGroupSemantics[] = "SIM";
     45 
     46 bool GetStream(const StreamParamsVec& streams,
     47                const StreamSelector& selector,
     48                StreamParams* stream_out) {
     49   const StreamParams* found = GetStream(streams, selector);
     50   if (found && stream_out)
     51     *stream_out = *found;
     52   return found != nullptr;
     53 }
     54 
     55 bool MediaStreams::GetAudioStream(
     56     const StreamSelector& selector, StreamParams* stream) {
     57   return GetStream(audio_, selector, stream);
     58 }
     59 
     60 bool MediaStreams::GetVideoStream(
     61     const StreamSelector& selector, StreamParams* stream) {
     62   return GetStream(video_, selector, stream);
     63 }
     64 
     65 bool MediaStreams::GetDataStream(
     66     const StreamSelector& selector, StreamParams* stream) {
     67   return GetStream(data_, selector, stream);
     68 }
     69 
     70 void MediaStreams::CopyFrom(const MediaStreams& streams) {
     71   audio_ = streams.audio_;
     72   video_ = streams.video_;
     73   data_ = streams.data_;
     74 }
     75 
     76 void MediaStreams::AddAudioStream(const StreamParams& stream) {
     77   AddStream(&audio_, stream);
     78 }
     79 
     80 void MediaStreams::AddVideoStream(const StreamParams& stream) {
     81   AddStream(&video_, stream);
     82 }
     83 
     84 void MediaStreams::AddDataStream(const StreamParams& stream) {
     85   AddStream(&data_, stream);
     86 }
     87 
     88 bool MediaStreams::RemoveAudioStream(
     89     const StreamSelector& selector) {
     90   return RemoveStream(&audio_, selector);
     91 }
     92 
     93 bool MediaStreams::RemoveVideoStream(
     94     const StreamSelector& selector) {
     95   return RemoveStream(&video_, selector);
     96 }
     97 
     98 bool MediaStreams::RemoveDataStream(
     99     const StreamSelector& selector) {
    100   return RemoveStream(&data_, selector);
    101 }
    102 
    103 static std::string SsrcsToString(const std::vector<uint32_t>& ssrcs) {
    104   std::ostringstream ost;
    105   ost << "ssrcs:[";
    106   for (std::vector<uint32_t>::const_iterator it = ssrcs.begin();
    107        it != ssrcs.end(); ++it) {
    108     if (it != ssrcs.begin()) {
    109       ost << ",";
    110     }
    111     ost << *it;
    112   }
    113   ost << "]";
    114   return ost.str();
    115 }
    116 
    117 bool SsrcGroup::has_semantics(const std::string& semantics_in) const {
    118   return (semantics == semantics_in && ssrcs.size() > 0);
    119 }
    120 
    121 std::string SsrcGroup::ToString() const {
    122   std::ostringstream ost;
    123   ost << "{";
    124   ost << "semantics:" << semantics << ";";
    125   ost << SsrcsToString(ssrcs);
    126   ost << "}";
    127   return ost.str();
    128 }
    129 
    130 std::string StreamParams::ToString() const {
    131   std::ostringstream ost;
    132   ost << "{";
    133   if (!groupid.empty()) {
    134     ost << "groupid:" << groupid << ";";
    135   }
    136   if (!id.empty()) {
    137     ost << "id:" << id << ";";
    138   }
    139   ost << SsrcsToString(ssrcs) << ";";
    140   ost << "ssrc_groups:";
    141   for (std::vector<SsrcGroup>::const_iterator it = ssrc_groups.begin();
    142        it != ssrc_groups.end(); ++it) {
    143     if (it != ssrc_groups.begin()) {
    144       ost << ",";
    145     }
    146     ost << it->ToString();
    147   }
    148   ost << ";";
    149   if (!type.empty()) {
    150     ost << "type:" << type << ";";
    151   }
    152   if (!display.empty()) {
    153     ost << "display:" << display << ";";
    154   }
    155   if (!cname.empty()) {
    156     ost << "cname:" << cname << ";";
    157   }
    158   if (!sync_label.empty()) {
    159     ost << "sync_label:" << sync_label;
    160   }
    161   ost << "}";
    162   return ost.str();
    163 }
    164 void StreamParams::GetPrimarySsrcs(std::vector<uint32_t>* ssrcs) const {
    165   const SsrcGroup* sim_group = get_ssrc_group(kSimSsrcGroupSemantics);
    166   if (sim_group == NULL) {
    167     ssrcs->push_back(first_ssrc());
    168   } else {
    169     for (size_t i = 0; i < sim_group->ssrcs.size(); ++i) {
    170       ssrcs->push_back(sim_group->ssrcs[i]);
    171     }
    172   }
    173 }
    174 
    175 void StreamParams::GetFidSsrcs(const std::vector<uint32_t>& primary_ssrcs,
    176                                std::vector<uint32_t>* fid_ssrcs) const {
    177   for (size_t i = 0; i < primary_ssrcs.size(); ++i) {
    178     uint32_t fid_ssrc;
    179     if (GetFidSsrc(primary_ssrcs[i], &fid_ssrc)) {
    180       fid_ssrcs->push_back(fid_ssrc);
    181     }
    182   }
    183 }
    184 
    185 bool StreamParams::AddSecondarySsrc(const std::string& semantics,
    186                                     uint32_t primary_ssrc,
    187                                     uint32_t secondary_ssrc) {
    188   if (!has_ssrc(primary_ssrc)) {
    189     return false;
    190   }
    191 
    192   ssrcs.push_back(secondary_ssrc);
    193   std::vector<uint32_t> ssrc_vector;
    194   ssrc_vector.push_back(primary_ssrc);
    195   ssrc_vector.push_back(secondary_ssrc);
    196   SsrcGroup ssrc_group = SsrcGroup(semantics, ssrc_vector);
    197   ssrc_groups.push_back(ssrc_group);
    198   return true;
    199 }
    200 
    201 bool StreamParams::GetSecondarySsrc(const std::string& semantics,
    202                                     uint32_t primary_ssrc,
    203                                     uint32_t* secondary_ssrc) const {
    204   for (std::vector<SsrcGroup>::const_iterator it = ssrc_groups.begin();
    205        it != ssrc_groups.end(); ++it) {
    206     if (it->has_semantics(semantics) &&
    207           it->ssrcs.size() >= 2 &&
    208           it->ssrcs[0] == primary_ssrc) {
    209       *secondary_ssrc = it->ssrcs[1];
    210       return true;
    211     }
    212   }
    213   return false;
    214 }
    215 
    216 bool IsOneSsrcStream(const StreamParams& sp) {
    217   if (sp.ssrcs.size() == 1 && sp.ssrc_groups.empty()) {
    218     return true;
    219   }
    220   if (sp.ssrcs.size() == 2) {
    221     const SsrcGroup* fid_group = sp.get_ssrc_group(kFidSsrcGroupSemantics);
    222     if (fid_group != NULL) {
    223       return (sp.ssrcs == fid_group->ssrcs);
    224     }
    225   }
    226   return false;
    227 }
    228 
    229 static void RemoveFirst(std::list<uint32_t>* ssrcs, uint32_t value) {
    230   std::list<uint32_t>::iterator it =
    231       std::find(ssrcs->begin(), ssrcs->end(), value);
    232   if (it != ssrcs->end()) {
    233     ssrcs->erase(it);
    234   }
    235 }
    236 
    237 bool IsSimulcastStream(const StreamParams& sp) {
    238   const SsrcGroup* const sg = sp.get_ssrc_group(kSimSsrcGroupSemantics);
    239   if (sg == NULL || sg->ssrcs.size() < 2) {
    240     return false;
    241   }
    242   // Start with all StreamParams SSRCs. Remove simulcast SSRCs (from sg) and
    243   // RTX SSRCs. If we still have SSRCs left, we don't know what they're for.
    244   // Also we remove first-found SSRCs only. So duplicates should lead to errors.
    245   std::list<uint32_t> sp_ssrcs(sp.ssrcs.begin(), sp.ssrcs.end());
    246   for (size_t i = 0; i < sg->ssrcs.size(); ++i) {
    247     RemoveFirst(&sp_ssrcs, sg->ssrcs[i]);
    248   }
    249   for (size_t i = 0; i < sp.ssrc_groups.size(); ++i) {
    250     const SsrcGroup& group = sp.ssrc_groups[i];
    251     if (group.semantics.compare(kFidSsrcGroupSemantics) != 0 ||
    252         group.ssrcs.size() != 2) {
    253       continue;
    254     }
    255     RemoveFirst(&sp_ssrcs, group.ssrcs[1]);
    256   }
    257   // If there's SSRCs left that we don't know how to handle, we bail out.
    258   return sp_ssrcs.size() == 0;
    259 }
    260 
    261 }  // namespace cricket
    262