refactor: merge Period::ProtectedAdaptationSetMap into AdaptationSet (#844)

---------

Co-authored-by: Cosmin Stejerean <cstejerean@meta.com>

packager/mpd/base/adaptation_set.cc

@@ -189,11 +189,73 @@ AdaptationSet::AdaptationSet(const std::string& language,
                              uint32_t* counter)
     : representation_counter_(counter),
       language_(language),
-      mpd_options_(mpd_options) {
+      mpd_options_(mpd_options),
+      protected_content_(nullptr) {
   DCHECK(counter);
 }
 
-AdaptationSet::~AdaptationSet() {}
+AdaptationSet::~AdaptationSet() {
+  delete protected_content_;
+}
+
+void AdaptationSet::set_protected_content(const MediaInfo& media_info) {
+  DCHECK(!protected_content_);
+  protected_content_ =
+      new MediaInfo::ProtectedContent(media_info.protected_content());
+}
+
+// The easiest way to check whether two protobufs are equal, is to compare the
+// serialized version.
+bool ProtectedContentEq(
+    const MediaInfo::ProtectedContent& content_protection1,
+    const MediaInfo::ProtectedContent& content_protection2) {
+  return content_protection1.SerializeAsString() ==
+         content_protection2.SerializeAsString();
+}
+
+bool AdaptationSet::MatchAdaptationSet(
+    const MediaInfo& media_info,
+    bool content_protection_in_adaptation_set) {
+  if (codec_ != GetBaseCodec(media_info))
+    return false;
+
+  if (!content_protection_in_adaptation_set)
+    return true;
+
+  if (!protected_content_)
+    return !media_info.has_protected_content();
+
+  if (!media_info.has_protected_content())
+    return false;
+
+  return ProtectedContentEq(*protected_content_,
+                            media_info.protected_content());
+}
+
+std::set<std::string> GetUUIDs(
+    const MediaInfo::ProtectedContent* protected_content) {
+  std::set<std::string> uuids;
+  for (const auto& entry : protected_content->content_protection_entry())
+    uuids.insert(entry.uuid());
+  return uuids;
+}
+
+bool AdaptationSet::SwitchableAdaptationSet(
+    const AdaptationSet& adaptation_set) {
+
+  // adaptation sets are switchable if both are not protected
+  if (!protected_content_ && !adaptation_set.protected_content()) {
+    return true;
+  }
+
+  // or if both are protected and have the same UUID
+  if (protected_content_ && adaptation_set.protected_content()) {
+    return GetUUIDs(protected_content_) ==
+           GetUUIDs(adaptation_set.protected_content());
+  }
+
+  return false;
+}
 
 Representation* AdaptationSet::AddRepresentation(const MediaInfo& media_info) {
   const uint32_t representation_id = media_info.has_index()

packager/mpd/base/adaptation_set.h

@@ -18,6 +18,7 @@
 #include <vector>
 
 #include <packager/mpd/base/xml/xml_node.h>
+#include "packager/mpd/base/media_info.pb.h"
 
 namespace shaka {
 
@@ -208,6 +209,29 @@ class AdaptationSet {
     transfer_characteristics_ = transfer_characteristics;
   };
 
+  /// Return ProtectedContent.
+  const MediaInfo::ProtectedContent* protected_content() const {
+    return protected_content_;
+  };
+
+  /// Set AdaptationSet@protected_content.
+  /// @param media_info to extract the ProtectedContent from.
+  void set_protected_content(const MediaInfo& media_info);
+
+  /// Check if the protected content associated with this AdaptationSet  matches
+  /// with the one in |media_info|.
+  /// @param media_info to extract ProtectedContent from.
+  /// @param content_protection_in_adaptation_set to indicate if there is
+  ///        protected content in AdaptationSet.
+  /// @return true if there is a match.
+  bool MatchAdaptationSet(const MediaInfo& media_info,
+                          bool content_protection_in_adaptation_set);
+
+  /// Check if the adaptation sets are switchable.
+  /// @param adaptation_set to compare this AdaptationSet with.
+  /// @return true if AdaptationSets are switchable.
+  bool SwitchableAdaptationSet(const AdaptationSet& adaptation_set);
+
  protected:
   /// @param language is the language of this AdaptationSet. Mainly relevant for
   ///        audio.
@@ -357,6 +381,9 @@ class AdaptationSet {
 
   // The label of this AdaptationSet.
   std::string label_;
+
+  // ProtectedContent of this AdaptationSet.
+  MediaInfo::ProtectedContent* protected_content_;
 };
 
 }  // namespace shaka

packager/mpd/base/period.cc

@@ -17,23 +17,6 @@
 namespace shaka {
 namespace {
 
-// The easiest way to check whether two protobufs are equal, is to compare the
-// serialized version.
-bool ProtectedContentEq(
-    const MediaInfo::ProtectedContent& content_protection1,
-    const MediaInfo::ProtectedContent& content_protection2) {
-  return content_protection1.SerializeAsString() ==
-         content_protection2.SerializeAsString();
-}
-
-std::set<std::string> GetUUIDs(
-    const MediaInfo::ProtectedContent& protected_content) {
-  std::set<std::string> uuids;
-  for (const auto& entry : protected_content.content_protection_entry())
-    uuids.insert(entry.uuid());
-  return uuids;
-}
-
 const std::string& GetDefaultAudioLanguage(const MpdOptions& mpd_options) {
   return mpd_options.mpd_params.default_language;
 }
@@ -91,8 +74,8 @@ AdaptationSet* Period::GetOrCreateAdaptationSet(
   std::list<AdaptationSet*>& adaptation_sets = adaptation_set_list_map_[key];
 
   for (AdaptationSet* adaptation_set : adaptation_sets) {
-    if (protected_adaptation_set_map_.Match(
+    if (adaptation_set->MatchAdaptationSet(
-            *adaptation_set, media_info, content_protection_in_adaptation_set))
+            media_info, content_protection_in_adaptation_set))
       return adaptation_set;
   }
 
@@ -107,14 +90,8 @@ AdaptationSet* Period::GetOrCreateAdaptationSet(
     return nullptr;
   }
 
-  if (content_protection_in_adaptation_set &&
-      media_info.has_protected_content()) {
-    protected_adaptation_set_map_.Register(*new_adaptation_set, media_info);
-    AddContentProtectionElements(media_info, new_adaptation_set.get());
-  }
   for (AdaptationSet* adaptation_set : adaptation_sets) {
-    if (protected_adaptation_set_map_.Switchable(*adaptation_set,
+    if (adaptation_set->SwitchableAdaptationSet(*new_adaptation_set)) {
-                                                 *new_adaptation_set)) {
       adaptation_set->AddAdaptationSetSwitching(new_adaptation_set.get());
       new_adaptation_set->AddAdaptationSetSwitching(adaptation_set);
     }
@@ -307,6 +284,13 @@ bool Period::SetNewAdaptationSetAttributes(
     // In practice it doesn't really make sense to adapt between text tracks.
     new_adaptation_set->ForceSetSegmentAlignment(true);
   }
+
+  if (content_protection_in_adaptation_set &&
+      media_info.has_protected_content()) {
+    new_adaptation_set->set_protected_content(media_info);
+    AddContentProtectionElements(media_info, new_adaptation_set);
+  }
+
   return true;
 }
 
@@ -331,12 +315,10 @@ AdaptationSet* Period::FindMatchingAdaptationSetForTrickPlay(
     adaptation_sets = &trickplay_cache_[*adaptation_set_key];
   }
   for (AdaptationSet* adaptation_set : *adaptation_sets) {
-    if (protected_adaptation_set_map_.Match(
+    if (adaptation_set->MatchAdaptationSet(
-            *adaptation_set, media_info,
+            media_info, content_protection_in_adaptation_set))
-            content_protection_in_adaptation_set)) {
       return adaptation_set;
   }
-  }
 
   return nullptr;
 }
@@ -349,55 +331,6 @@ std::string Period::GetAdaptationSetKeyForTrickPlay(
                              mpd_options_.mpd_params.allow_codec_switching);
 }
 
-void Period::ProtectedAdaptationSetMap::Register(
-    const AdaptationSet& adaptation_set,
-    const MediaInfo& media_info) {
-  CHECK(protected_content_map_.find(&adaptation_set) ==
-        protected_content_map_.end());
-  protected_content_map_[&adaptation_set] = media_info.protected_content();
-}
-
-bool Period::ProtectedAdaptationSetMap::Match(
-    const AdaptationSet& adaptation_set,
-    const MediaInfo& media_info,
-    bool content_protection_in_adaptation_set) {
-  if (adaptation_set.codec() != GetBaseCodec(media_info))
-    return false;
-
-  if (!content_protection_in_adaptation_set)
-    return true;
-
-  const auto protected_content_it =
-      protected_content_map_.find(&adaptation_set);
-  // If the AdaptationSet ID is not registered in the map, then it is clear
-  // content.
-  if (protected_content_it == protected_content_map_.end())
-    return !media_info.has_protected_content();
-  if (!media_info.has_protected_content())
-    return false;
-
-  return ProtectedContentEq(protected_content_it->second,
-                            media_info.protected_content());
-}
-
-bool Period::ProtectedAdaptationSetMap::Switchable(
-    const AdaptationSet& adaptation_set_a,
-    const AdaptationSet& adaptation_set_b) {
-  const auto protected_content_it_a =
-      protected_content_map_.find(&adaptation_set_a);
-  const auto protected_content_it_b =
-      protected_content_map_.find(&adaptation_set_b);
-
-  if (protected_content_it_a == protected_content_map_.end())
-    return protected_content_it_b == protected_content_map_.end();
-  if (protected_content_it_b == protected_content_map_.end())
-    return false;
-  // Get all the UUIDs of the AdaptationSet. If another AdaptationSet has the
-  // same UUIDs then those are switchable.
-  return GetUUIDs(protected_content_it_a->second) ==
-         GetUUIDs(protected_content_it_b->second);
-}
-
 Period::~Period() {
   if (!trickplay_cache_.empty()) {
     LOG(WARNING) << "Trickplay adaptation set did not get a valid adaptation "

packager/mpd/base/period.h

@@ -133,33 +133,6 @@ class Period {
   // grouping key. These AdaptationSets still have not found reference
   // AdaptationSet.
   std::map<std::string, std::list<AdaptationSet*>> trickplay_cache_;
-
-  // Tracks ProtectedContent in AdaptationSet.
-  class ProtectedAdaptationSetMap {
-   public:
-    ProtectedAdaptationSetMap() = default;
-    // Register the |adaptation_set| with associated |media_info| in the map.
-    void Register(const AdaptationSet& adaptation_set,
-                  const MediaInfo& media_info);
-    // Check if the protected content associated with |adaptation_set| matches
-    // with the one in |media_info|.
-    bool Match(const AdaptationSet& adaptation_set,
-               const MediaInfo& media_info,
-               bool content_protection_in_adaptation_set);
-    // Check if the two adaptation sets are switchable.
-    bool Switchable(const AdaptationSet& adaptation_set_a,
-                    const AdaptationSet& adaptation_set_b);
-
-   private:
-    ProtectedAdaptationSetMap(const ProtectedAdaptationSetMap&) = delete;
-    ProtectedAdaptationSetMap& operator=(const ProtectedAdaptationSetMap&) =
-        delete;
-
-    // AdaptationSet => ProtectedContent map.
-    std::map<const AdaptationSet*, MediaInfo::ProtectedContent>
-        protected_content_map_;
-  };
-  ProtectedAdaptationSetMap protected_adaptation_set_map_;
 };
 
 }  // namespace shaka