Bug 1846848 - part3 : add a way to get CDM capabilities from the chrome process. r=gerard-majax,jolin

Differential Revision: https://phabricator.services.mozilla.com/D194452

ipc/glue/UtilityAudioDecoderChild.cpp

@@ -19,6 +19,11 @@
 #  include "mozilla/layers/VideoBridgeUtils.h"
 #endif
 
+#ifdef MOZ_WMF_CDM
+#  include "mozilla/EMEUtils.h"
+#  include "mozilla/PMFCDM.h"
+#endif
+
 namespace mozilla::ipc {
 
 NS_IMETHODIMP UtilityAudioDecoderChildShutdownObserver::Observe(
@@ -173,4 +178,33 @@ bool UtilityAudioDecoderChild::CreateVideoBridge() {
 }
 #endif
 
+#ifdef MOZ_WMF_CDM
+void UtilityAudioDecoderChild::GetKeySystemCapabilities() {
+  EME_LOG("Ask capabilities for all supported CDMs");
+  SendGetKeySystemCapabilities()->Then(
+      NS_GetCurrentThread(), __func__,
+      [](CopyableTArray<MFCDMCapabilitiesIPDL>&& result) {
+        for (const auto& capabilities : result) {
+          EME_LOG("Received capabilities for %s",
+                  NS_ConvertUTF16toUTF8(capabilities.keySystem()).get());
+          for (const auto& v : capabilities.videoCapabilities()) {
+            EME_LOG("  capabilities: video=%s",
+                    NS_ConvertUTF16toUTF8(v.contentType()).get());
+          }
+          for (const auto& a : capabilities.audioCapabilities()) {
+            EME_LOG("  capabilities: audio=%s",
+                    NS_ConvertUTF16toUTF8(a.contentType()).get());
+          }
+          for (const auto& e : capabilities.encryptionSchemes()) {
+            EME_LOG("  capabilities: encryptionScheme=%s",
+                    EncryptionSchemeStr(e));
+          }
+        }
+      },
+      [](const mozilla::ipc::ResponseRejectReason& aReason) {
+        EME_LOG("IPC failure for GetKeySystemCapabilities!");
+      });
+}
+#endif
+
 }  // namespace mozilla::ipc