Bug 1278198 - Enforce codecs match the capability and content type in GetSupportedCapabilities(). r=gerald

We're supposed to reject MediaKeySystemCapabilities which have a contentType
that has codecs which don't match their major type, i.e. audio codecs in a
video container type.

I missed that, and it's causing us to fail the
test_eme_requestMediaKeySystemAccess case "MP4 video container with both audio
and video codec type in videoType".


MozReview-Commit-ID: KQVGk9hX3eC

--HG--
extra : rebase_source : f8ed145d050bb27f2f6867ec4b308bbcd30d17a5

dom/media/eme/MediaKeySystemAccess.cpp

@@ -619,9 +619,37 @@ GetMajorType(const nsAString& aContentType)
   return Invalid;
 }
 
+static CodecType
+GetCodecType(const GMPCodecString& aCodec)
+{
+  if (aCodec.Equals(GMP_CODEC_AAC) ||
+      aCodec.Equals(GMP_CODEC_OPUS) ||
+      aCodec.Equals(GMP_CODEC_VORBIS)) {
+    return Audio;
+  }
+  if (aCodec.Equals(GMP_CODEC_H264) ||
+      aCodec.Equals(GMP_CODEC_VP8) ||
+      aCodec.Equals(GMP_CODEC_VP9)) {
+    return Video;
+  }
+  return Invalid;
+}
+
+static bool
+AllCodecsOfType(const nsTArray<GMPCodecString>& aCodecs, const CodecType aCodecType)
+{
+  for (const GMPCodecString& codec : aCodecs) {
+    if (GetCodecType(codec) != aCodecType) {
+      return false;
+    }
+  }
+  return true;
+}
+
 // 3.1.2.3 Get Supported Capabilities for Audio/Video Type
 static Sequence<MediaKeySystemMediaCapability>
-GetSupportedCapabilities(mozIGeckoMediaPluginService* aGMPService,
+GetSupportedCapabilities(const CodecType aCodecType,
+                         mozIGeckoMediaPluginService* aGMPService,
                          const nsTArray<MediaKeySystemMediaCapability>& aRequestedCapabilities,
                          const MediaKeySystemConfiguration& aPartialConfig,
                          const KeySystemConfig& aKeySystem,
@@ -732,20 +760,19 @@ GetSupportedCapabilities(mozIGeckoMediaPluginService* aGMPService,
     // (Note: codecs array is 'parameter').
 
     // If media types is empty:
-    const auto majorType = GetMajorType(container);
     if (codecs.IsEmpty()) {
       // If container normatively implies a specific set of codecs and codec constraints:
       // Let parameters be that set.
       if (isMP4) {
-        if (majorType == Audio) {
+        if (aCodecType == Audio) {
           codecs.AppendElement(GMP_CODEC_AAC);
-        } else if (majorType == Video) {
+        } else if (aCodecType == Video) {
           codecs.AppendElement(GMP_CODEC_H264);
         }
       } else if (isWebM) {
-        if (majorType == Audio) {
+        if (aCodecType == Audio) {
           codecs.AppendElement(GMP_CODEC_VORBIS);
-        } else if (majorType == Video) {
+        } else if (aCodecType == Video) {
           codecs.AppendElement(GMP_CODEC_VP8);
         }
       }
@@ -754,6 +781,7 @@ GetSupportedCapabilities(mozIGeckoMediaPluginService* aGMPService,
     }
 
     // If content type is not strictly a audio/video type, continue to the next iteration.
+    const auto majorType = GetMajorType(container);
     if (majorType == Invalid) {
       EME_LOG("MediaKeySystemConfiguration (label='%s') "
               "MediaKeySystemMediaCapability('%s','%s') unsupported; "
@@ -763,7 +791,16 @@ GetSupportedCapabilities(mozIGeckoMediaPluginService* aGMPService,
               NS_ConvertUTF16toUTF8(robustness).get());
       continue;
     }
-
+    if (majorType != aCodecType || !AllCodecsOfType(codecs, aCodecType)) {
+      EME_LOG("MediaKeySystemConfiguration (label='%s') "
+              "MediaKeySystemMediaCapability('%s','%s') unsupported; "
+              "MIME type mixes audio codecs in video capabilities "
+              "or video codecs in audio capabilities.",
+              NS_ConvertUTF16toUTF8(aPartialConfig.mLabel).get(),
+              NS_ConvertUTF16toUTF8(contentType).get(),
+              NS_ConvertUTF16toUTF8(robustness).get());
+      continue;
+    }
     // If robustness is not the empty string and contains an unrecognized
     // value or a value not supported by implementation, continue to the
     // next iteration. String comparison is case-sensitive.
@@ -1016,7 +1053,8 @@ GetSupportedConfig(mozIGeckoMediaPluginService* aGMPService,
     // configuration's videoCapabilities member, accumulated configuration,
     // and restrictions.
     Sequence<MediaKeySystemMediaCapability> caps =
-      GetSupportedCapabilities(aGMPService,
+      GetSupportedCapabilities(Video,
+                               aGMPService,
                                aCandidate.mVideoCapabilities,
                                config,
                                aKeySystem,
@@ -1041,7 +1079,8 @@ GetSupportedConfig(mozIGeckoMediaPluginService* aGMPService,
     // for Audio/Video Type algorithm on Audio, candidate configuration's audioCapabilities
     // member, accumulated configuration, and restrictions.
     Sequence<MediaKeySystemMediaCapability> caps =
-      GetSupportedCapabilities(aGMPService,
+      GetSupportedCapabilities(Audio,
+                               aGMPService,
                                aCandidate.mAudioCapabilities,
                                config,
                                aKeySystem,