Fill manifest drm info with media files' pssh when needed

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=174185407

library/core/src/main/java/com/google/android/exoplayer2/Format.java

@@ -21,6 +21,7 @@ import android.media.MediaFormat;
 import android.os.Parcel;
 import android.os.Parcelable;
 import com.google.android.exoplayer2.drm.DrmInitData;
+import com.google.android.exoplayer2.drm.DrmInitData.SchemeData;
 import com.google.android.exoplayer2.metadata.Metadata;
 import com.google.android.exoplayer2.util.MimeTypes;
 import com.google.android.exoplayer2.util.Util;
@@ -464,8 +465,8 @@ public final class Format implements Parcelable {
     float frameRate = this.frameRate == NO_VALUE ? manifestFormat.frameRate : this.frameRate;
     @C.SelectionFlags int selectionFlags = this.selectionFlags |  manifestFormat.selectionFlags;
     String language = this.language == null ? manifestFormat.language : this.language;
-    DrmInitData drmInitData = manifestFormat.drmInitData != null ? manifestFormat.drmInitData
-        : this.drmInitData;
+    DrmInitData drmInitData = manifestFormat.drmInitData != null
+        ? getFilledManifestDrmData(manifestFormat.drmInitData) : this.drmInitData;
     return new Format(id, containerMimeType, sampleMimeType, codecs, bitrate, maxInputSize, width,
         height, frameRate, rotationDegrees, pixelWidthHeightRatio, projectionData, stereoMode,
         colorInfo, channelCount, sampleRate, pcmEncoding, encoderDelay, encoderPadding,
@@ -731,4 +732,42 @@ public final class Format implements Parcelable {
 
   };
 
+  private DrmInitData getFilledManifestDrmData(DrmInitData manifestDrmData) {
+    // All exposed SchemeDatas must include key request information.
+    ArrayList<SchemeData> exposedSchemeDatas = new ArrayList<>();
+    ArrayList<SchemeData> emptySchemeDatas = new ArrayList<>();
+    for (int i = 0; i < manifestDrmData.schemeDataCount; i++) {
+      SchemeData schemeData = manifestDrmData.get(i);
+      if (schemeData.hasData()) {
+        exposedSchemeDatas.add(schemeData);
+      } else /* needs initialization data filling */ {
+        emptySchemeDatas.add(schemeData);
+      }
+    }
+
+    if (emptySchemeDatas.isEmpty()) {
+      // Manifest DRM information is complete.
+      return manifestDrmData;
+    } else if (drmInitData == null) {
+      // The manifest DRM data needs filling but this format does not include enough information to
+      // do it. A subset of the manifest's scheme datas should not be exposed because a
+      // DrmSessionManager could decide it does not support the format, while the missing
+      // information comes in a format feed immediately after.
+      return null;
+    }
+
+    int needFillingCount = emptySchemeDatas.size();
+    for (int i = 0; i < drmInitData.schemeDataCount; i++) {
+      SchemeData mediaSchemeData = drmInitData.get(i);
+      for (int j = 0; j < needFillingCount; j++) {
+        if (mediaSchemeData.canReplace(emptySchemeDatas.get(j))) {
+          exposedSchemeDatas.add(mediaSchemeData);
+          break;
+        }
+      }
+    }
+    return exposedSchemeDatas.isEmpty() ? null : new DrmInitData(manifestDrmData.schemeType,
+        exposedSchemeDatas.toArray(new SchemeData[exposedSchemeDatas.size()]));
+  }
+
 }

library/core/src/main/java/com/google/android/exoplayer2/drm/DefaultDrmSessionManager.java

@@ -340,7 +340,7 @@ public class DefaultDrmSessionManager<T extends ExoMediaCrypto> implements DrmSe
 
   @Override
   public boolean canAcquireSession(@NonNull DrmInitData drmInitData) {
-    SchemeData schemeData = getSchemeData(drmInitData, uuid);
+    SchemeData schemeData = getSchemeData(drmInitData, uuid, true);
     if (schemeData == null) {
       // No data for this manager's scheme.
       return false;
@@ -371,7 +371,7 @@ public class DefaultDrmSessionManager<T extends ExoMediaCrypto> implements DrmSe
     byte[] initData = null;
     String mimeType = null;
     if (offlineLicenseKeySetId == null) {
-      SchemeData data = getSchemeData(drmInitData, uuid);
+      SchemeData data = getSchemeData(drmInitData, uuid, false);
       if (data == null) {
         final IllegalStateException error = new IllegalStateException(
             "Media does not support uuid: " + uuid);
@@ -467,15 +467,19 @@ public class DefaultDrmSessionManager<T extends ExoMediaCrypto> implements DrmSe
    *
    * @param drmInitData The {@link DrmInitData} from which to extract the {@link SchemeData}.
    * @param uuid The UUID.
+   * @param allowMissingData Whether a {@link SchemeData} with null {@link SchemeData#data} may be
+   *     returned.
    * @return The extracted {@link SchemeData}, or null if no suitable data is present.
    */
-  private static SchemeData getSchemeData(DrmInitData drmInitData, UUID uuid) {
+  private static SchemeData getSchemeData(DrmInitData drmInitData, UUID uuid,
+      boolean allowMissingData) {
     // Look for matching scheme data (matching the Common PSSH box for ClearKey).
     List<SchemeData> matchingSchemeDatas = new ArrayList<>(drmInitData.schemeDataCount);
     for (int i = 0; i < drmInitData.schemeDataCount; i++) {
       SchemeData schemeData = drmInitData.get(i);
-      if (schemeData.matches(uuid)
-          || (C.CLEARKEY_UUID.equals(uuid) && schemeData.matches(C.COMMON_PSSH_UUID))) {
+      boolean uuidMatches = schemeData.matches(uuid)
+          || (C.CLEARKEY_UUID.equals(uuid) && schemeData.matches(C.COMMON_PSSH_UUID));
+      if (uuidMatches && (schemeData.data != null || allowMissingData)) {
         matchingSchemeDatas.add(schemeData);
       }
     }
@@ -488,7 +492,8 @@ public class DefaultDrmSessionManager<T extends ExoMediaCrypto> implements DrmSe
     if (C.WIDEVINE_UUID.equals(uuid)) {
       for (int i = 0; i < matchingSchemeDatas.size(); i++) {
         SchemeData matchingSchemeData = matchingSchemeDatas.get(i);
-        int version = PsshAtomUtil.parseVersion(matchingSchemeData.data);
+        int version = matchingSchemeData.hasData()
+            ? PsshAtomUtil.parseVersion(matchingSchemeData.data) : -1;
         if (Util.SDK_INT < 23 && version == 0) {
           return matchingSchemeData;
         } else if (Util.SDK_INT >= 23 && version == 1) {

library/core/src/main/java/com/google/android/exoplayer2/drm/DrmInitData.java

@@ -54,6 +54,14 @@ public final class DrmInitData implements Comparator<SchemeData>, Parcelable {
     this(null, false, schemeDatas.toArray(new SchemeData[schemeDatas.size()]));
   }
 
+  /**
+   * @param schemeType See {@link #schemeType}.
+   * @param schemeDatas Scheme initialization data for possibly multiple DRM schemes.
+   */
+  public DrmInitData(String schemeType, List<SchemeData> schemeDatas) {
+    this(schemeType, false, schemeDatas.toArray(new SchemeData[schemeDatas.size()]));
+  }
+
   /**
    * @param schemeDatas Scheme initialization data for possibly multiple DRM schemes.
    */
@@ -62,7 +70,7 @@ public final class DrmInitData implements Comparator<SchemeData>, Parcelable {
   }
 
   /**
-   * @param schemeType The protection scheme type, or null if not applicable or unknown.
+   * @param schemeType See {@link #schemeType}.
    * @param schemeDatas Scheme initialization data for possibly multiple DRM schemes.
    */
   public DrmInitData(@Nullable String schemeType, SchemeData... schemeDatas) {
@@ -203,7 +211,7 @@ public final class DrmInitData implements Comparator<SchemeData>, Parcelable {
      */
     public final String mimeType;
     /**
-     * The initialization data.
+     * The initialization data. May be null for scheme support checks only.
      */
     public final byte[] data;
     /**
@@ -214,8 +222,8 @@ public final class DrmInitData implements Comparator<SchemeData>, Parcelable {
     /**
      * @param uuid The {@link UUID} of the DRM scheme, or {@link C#UUID_NIL} if the data is
      *     universal (i.e. applies to all schemes).
-     * @param mimeType The mimeType of the initialization data.
-     * @param data The initialization data.
+     * @param mimeType See {@link #mimeType}.
+     * @param data See {@link #data}.
      */
     public SchemeData(UUID uuid, String mimeType, byte[] data) {
       this(uuid, mimeType, data, false);
@@ -224,14 +232,14 @@ public final class DrmInitData implements Comparator<SchemeData>, Parcelable {
     /**
      * @param uuid The {@link UUID} of the DRM scheme, or {@link C#UUID_NIL} if the data is
      *     universal (i.e. applies to all schemes).
-     * @param mimeType The mimeType of the initialization data.
-     * @param data The initialization data.
-     * @param requiresSecureDecryption Whether secure decryption is required.
+     * @param mimeType See {@link #mimeType}.
+     * @param data See {@link #data}.
+     * @param requiresSecureDecryption See {@link #requiresSecureDecryption}.
      */
     public SchemeData(UUID uuid, String mimeType, byte[] data, boolean requiresSecureDecryption) {
       this.uuid = Assertions.checkNotNull(uuid);
       this.mimeType = Assertions.checkNotNull(mimeType);
-      this.data = Assertions.checkNotNull(data);
+      this.data = data;
       this.requiresSecureDecryption = requiresSecureDecryption;
     }
 
@@ -252,6 +260,23 @@ public final class DrmInitData implements Comparator<SchemeData>, Parcelable {
       return C.UUID_NIL.equals(uuid) || schemeUuid.equals(uuid);
     }
 
+    /**
+     * Returns whether this {@link SchemeData} can be used to replace {@code other}.
+     *
+     * @param other A {@link SchemeData}.
+     * @return Whether this {@link SchemeData} can be used to replace {@code other}.
+     */
+    public boolean canReplace(SchemeData other) {
+      return hasData() && !other.hasData() && matches(other.uuid);
+    }
+
+    /**
+     * Returns whether {@link #data} is non-null.
+     */
+    public boolean hasData() {
+      return data != null;
+    }
+
     @Override
     public boolean equals(Object obj) {
       if (!(obj instanceof SchemeData)) {

library/core/src/main/java/com/google/android/exoplayer2/drm/DrmSessionManager.java

@@ -17,6 +17,7 @@ package com.google.android.exoplayer2.drm;
 
 import android.annotation.TargetApi;
 import android.os.Looper;
+import com.google.android.exoplayer2.drm.DrmInitData.SchemeData;
 
 /**
  * Manages a DRM session.
@@ -39,7 +40,8 @@ public interface DrmSessionManager<T extends ExoMediaCrypto> {
    * must be returned to {@link #releaseSession(DrmSession)} when it is no longer required.
    *
    * @param playbackLooper The looper associated with the media playback thread.
-   * @param drmInitData DRM initialization data.
+   * @param drmInitData DRM initialization data. All contained {@link SchemeData}s must contain
+   *     non-null {@link SchemeData#data}.
    * @return The DRM session.
    */
   DrmSession<T> acquireSession(Looper playbackLooper, DrmInitData drmInitData);

library/dash/src/main/java/com/google/android/exoplayer2/source/dash/manifest/DashManifestParser.java

@@ -346,45 +346,54 @@ public class DashManifestParser extends DefaultHandler
   protected Pair<String, SchemeData> parseContentProtection(XmlPullParser xpp)
       throws XmlPullParserException, IOException {
     String schemeIdUri = xpp.getAttributeValue(null, "schemeIdUri");
-    boolean isPlayReady = "urn:uuid:9a04f079-9840-4286-ab92-e65be0885f95".equals(schemeIdUri);
     String schemeType = null;
     byte[] data = null;
     UUID uuid = null;
     boolean requiresSecureDecoder = false;
 
-    if ("urn:mpeg:dash:mp4protection:2011".equals(schemeIdUri)) {
-      schemeType = xpp.getAttributeValue(null, "value");
-      String defaultKid = xpp.getAttributeValue(null, "cenc:default_KID");
-      if (defaultKid != null && !"00000000-0000-0000-0000-000000000000".equals(defaultKid)) {
-        UUID keyId = UUID.fromString(defaultKid);
-        data = PsshAtomUtil.buildPsshAtom(C.COMMON_PSSH_UUID, new UUID[] {keyId}, null);
-        uuid = C.COMMON_PSSH_UUID;
-      }
+    switch (schemeIdUri) {
+      case "urn:mpeg:dash:mp4protection:2011":
+        schemeType = xpp.getAttributeValue(null, "value");
+        String defaultKid = xpp.getAttributeValue(null, "cenc:default_KID");
+        if (defaultKid != null && !"00000000-0000-0000-0000-000000000000".equals(defaultKid)) {
+          UUID keyId = UUID.fromString(defaultKid);
+          data = PsshAtomUtil.buildPsshAtom(C.COMMON_PSSH_UUID, new UUID[] {keyId}, null);
+          uuid = C.COMMON_PSSH_UUID;
+        }
+        break;
+      case "urn:uuid:9a04f079-9840-4286-ab92-e65be0885f95":
+        uuid = C.PLAYREADY_UUID;
+        break;
+      case "urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed":
+        uuid = C.WIDEVINE_UUID;
+        break;
+      default:
+        break;
     }
 
     do {
       xpp.next();
-      if (data == null && XmlPullParserUtil.isStartTag(xpp, "cenc:pssh")
-          && xpp.next() == XmlPullParser.TEXT) {
-        // The cenc:pssh element is defined in 23001-7:2015.
-        data = Base64.decode(xpp.getText(), Base64.DEFAULT);
-        uuid = PsshAtomUtil.parseUuid(data);
-        if (uuid == null) {
-          Log.w(TAG, "Skipping malformed cenc:pssh data");
-          data = null;
-        }
-      } else if (data == null && isPlayReady && XmlPullParserUtil.isStartTag(xpp, "mspr:pro")
-          && xpp.next() == XmlPullParser.TEXT) {
-        // The mspr:pro element is defined in DASH Content Protection using Microsoft PlayReady.
-        data = PsshAtomUtil.buildPsshAtom(C.PLAYREADY_UUID,
-            Base64.decode(xpp.getText(), Base64.DEFAULT));
-        uuid = C.PLAYREADY_UUID;
-      } else if (XmlPullParserUtil.isStartTag(xpp, "widevine:license")) {
+      if (XmlPullParserUtil.isStartTag(xpp, "widevine:license")) {
         String robustnessLevel = xpp.getAttributeValue(null, "robustness_level");
         requiresSecureDecoder = robustnessLevel != null && robustnessLevel.startsWith("HW");
+      } else if (data == null) {
+        if (XmlPullParserUtil.isStartTag(xpp, "cenc:pssh") && xpp.next() == XmlPullParser.TEXT) {
+          // The cenc:pssh element is defined in 23001-7:2015.
+          data = Base64.decode(xpp.getText(), Base64.DEFAULT);
+          uuid = PsshAtomUtil.parseUuid(data);
+          if (uuid == null) {
+            Log.w(TAG, "Skipping malformed cenc:pssh data");
+            data = null;
+          }
+        } else if (uuid == C.PLAYREADY_UUID && XmlPullParserUtil.isStartTag(xpp, "mspr:pro")
+            && xpp.next() == XmlPullParser.TEXT) {
+          // The mspr:pro element is defined in DASH Content Protection using Microsoft PlayReady.
+          data = PsshAtomUtil.buildPsshAtom(C.PLAYREADY_UUID,
+              Base64.decode(xpp.getText(), Base64.DEFAULT));
+        }
       }
     } while (!XmlPullParserUtil.isEndTag(xpp, "ContentProtection"));
-    SchemeData schemeData = data != null
+    SchemeData schemeData = uuid != null
         ? new SchemeData(uuid, MimeTypes.VIDEO_MP4, data, requiresSecureDecoder) : null;
     return Pair.create(schemeType, schemeData);
   }
@@ -518,10 +527,8 @@ public class DashManifestParser extends DefaultHandler
     ArrayList<SchemeData> drmSchemeDatas = representationInfo.drmSchemeDatas;
     drmSchemeDatas.addAll(extraDrmSchemeDatas);
     if (!drmSchemeDatas.isEmpty()) {
-      DrmInitData drmInitData = new DrmInitData(drmSchemeDatas);
-      if (drmSchemeType != null) {
-        drmInitData = drmInitData.copyWithSchemeType(drmSchemeType);
-      }
+      filterRedundantIncompleteSchemeDatas(drmSchemeDatas);
+      DrmInitData drmInitData = new DrmInitData(drmSchemeType, drmSchemeDatas);
       format = format.copyWithDrmInitData(drmInitData);
     }
     ArrayList<Descriptor> inbandEventStreams = representationInfo.inbandEventStreams;
@@ -728,6 +735,25 @@ public class DashManifestParser extends DefaultHandler
 
   // Utility methods.
 
+  /**
+   * Removes unnecessary {@link SchemeData}s with null {@link SchemeData#data}.
+   */
+  private static void filterRedundantIncompleteSchemeDatas(ArrayList<SchemeData> schemeDatas) {
+    for (int i = schemeDatas.size() - 1; i >= 0; i--) {
+      SchemeData schemeData = schemeDatas.get(i);
+      if (!schemeData.hasData()) {
+        for (int j = 0; j < schemeDatas.size(); j++) {
+          if (schemeDatas.get(j).canReplace(schemeData)) {
+            // schemeData is incomplete, but there is another matching SchemeData which does contain
+            // data, so we remove the incomplete one.
+            schemeDatas.remove(i);
+            break;
+          }
+        }
+      }
+    }
+  }
+
   /**
    * Derives a sample mimeType from a container mimeType and codecs attribute.
    *