Remove support for cbc1 and cens encryptions schemes

PiperOrigin-RevId: 327199833

RELEASENOTES.md

@@ -269,6 +269,10 @@
         ([#7011](https://github.com/google/ExoPlayer/issues/7011),
         [#6725](https://github.com/google/ExoPlayer/issues/6725),
         [#7066](https://github.com/google/ExoPlayer/issues/7066)).
+    *   Remove support for `cbc1` and `cens` encrytion schemes. Support for
+        these schemes was removed from the Android platform from API level 30,
+        and the range of API levels for which they are supported is too small to
+        be useful.
     *   Remove generic types from DRM components.
 *   Test utils: Add `TestExoPlayer`, a utility class with APIs to create
     `SimpleExoPlayer` instances with fake components for testing.

demos/main/src/main/assets/media.exolist.json

@@ -125,18 +125,6 @@
         "drm_license_uri": "https://proxy.uat.widevine.com/proxy?provider=widevine_test"
       },
       {
-        "name": "Secure (cbc1)",
-        "uri": "https://storage.googleapis.com/wvmedia/cbc1/h264/tears/tears_aes_cbc1.mpd",
-        "drm_scheme": "widevine",
-        "drm_license_uri": "https://proxy.uat.widevine.com/proxy?provider=widevine_test"
-      },
-      {
-        "name": "Secure UHD (cbc1)",
-        "uri": "https://storage.googleapis.com/wvmedia/cbc1/h264/tears/tears_aes_cbc1_uhd.mpd",
-        "drm_scheme": "widevine",
-        "drm_license_uri": "https://proxy.uat.widevine.com/proxy?provider=widevine_test"
-      },
-      {
         "name": "Secure (cbcs)",
         "uri": "https://storage.googleapis.com/wvmedia/cbcs/h264/tears/tears_aes_cbcs.mpd",
         "drm_scheme": "widevine",

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

@@ -585,12 +585,16 @@ public class DefaultDrmSessionManager implements DrmSessionManager {
     if (schemeType == null || C.CENC_TYPE_cenc.equals(schemeType)) {
       // If there is no scheme information, assume patternless AES-CTR.
       return true;
-    } else if (C.CENC_TYPE_cbc1.equals(schemeType)
-        || C.CENC_TYPE_cbcs.equals(schemeType)
-        || C.CENC_TYPE_cens.equals(schemeType)) {
-      // API support for AES-CBC and pattern encryption was added in API 24. However, the
+    } else if (C.CENC_TYPE_cbcs.equals(schemeType)) {
+      // Support for cbcs (AES-CBC with pattern encryption) was added in API 24. However, the
       // implementation was not stable until API 25.
       return Util.SDK_INT >= 25;
+    } else if (C.CENC_TYPE_cbc1.equals(schemeType) || C.CENC_TYPE_cens.equals(schemeType)) {
+      // Support for cbc1 (AES-CTR with pattern encryption) and cens (AES-CBC without pattern
+      // encryption) was also added in API 24 and made stable from API 25, however support was
+      // removed from API 30. Since the range of API levels for which these modes are usable is too
+      // small to be useful, we don't indicate support on any API level.
+      return false;
     }
     // Unknown schemes, assume one of them is supported.
     return true;

playbacktests/src/androidTest/java/com/google/android/exoplayer2/playbacktests/gts/CommonEncryptionDrmTest.java

@@ -75,20 +75,6 @@ public final class CommonEncryptionDrmTest {
   }
 
   @Test
-  public void cbc1SchemeTypeV25() {
-    if (Util.SDK_INT < 25) {
-      // cbc1 support was added in API 24, but it is stable from API 25 onwards.
-      // See [internal: b/65634809].
-      // Pass.
-      return;
-    }
-    testRunner
-        .setStreamName("test_widevine_h264_scheme_cbc1")
-        .setManifestUrl(DashTestData.WIDEVINE_SCHEME_CBC1)
-        .run();
-  }
-
-  @Test
   public void cbcsSchemeTypeV25() {
     if (Util.SDK_INT < 25) {
       // cbcs support was added in API 24, but it is stable from API 25 onwards.
@@ -101,9 +87,4 @@ public final class CommonEncryptionDrmTest {
         .setManifestUrl(DashTestData.WIDEVINE_SCHEME_CBCS)
         .run();
   }
-
-  @Test
-  public void censSchemeTypeV25() {
-    // TODO: Implement once content is available. Track [internal: b/31219813].
-  }
 }

playbacktests/src/androidTest/java/com/google/android/exoplayer2/playbacktests/gts/DashTestData.java

@@ -45,8 +45,6 @@ import com.google.android.exoplayer2.util.Util;
 
   // Widevine encrypted content manifests using different common encryption schemes.
   public static final String WIDEVINE_SCHEME_CENC = BASE_URL_COMMON_ENCRYPTION + "tears-cenc.mpd";
-  public static final String WIDEVINE_SCHEME_CBC1 =
-      BASE_URL_COMMON_ENCRYPTION + "tears-aes-cbc1.mpd";
   public static final String WIDEVINE_SCHEME_CBCS =
       BASE_URL_COMMON_ENCRYPTION + "tears-aes-cbcs.mpd";