Implement "Key Presence" step in "Encrypted Block Encounted" algorithm in EME.

media/filters/ffmpeg_video_decoder_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <deque>
 #include <string>
 
 #include "base/bind.h"
 #include "base/message_loop.h"
 #include "base/memory/singleton.h"
@@ skipping 409 matching lines @@
   // error.
   VideoDecoder::DecoderStatus status;
   scoped_refptr<VideoFrame> video_frame;
   Read(&status, &video_frame);
   EXPECT_EQ(VideoDecoder::kDecryptError, status);
   EXPECT_FALSE(video_frame);
 
   message_loop_.RunAllPending();
 }
 
+// Test the case that the decryptor has no key to decrypt the encrypted buffer.
+TEST_F(FFmpegVideoDecoderTest, DecodeEncryptedFrame_NoDecryptionKey) {
+  Initialize();
+
+  // Simulate decoding a single encrypted frame.
+  EXPECT_CALL(*demuxer_, Read(_))
+      .WillRepeatedly(ReturnBuffer(encrypted_i_frame_buffer_));
+  EXPECT_CALL(*decryptor_, Decrypt(encrypted_i_frame_buffer_, _))
+      .WillRepeatedly(RunDecryptCB(Decryptor::kNoKey,
+                                   scoped_refptr<media::DecoderBuffer>()));
+
+  // Our read should still get satisfied with end of stream frame during an
+  // error.
+  VideoDecoder::DecoderStatus status;
+  scoped_refptr<VideoFrame> video_frame;
+  Read(&status, &video_frame);
+  EXPECT_EQ(VideoDecoder::kDecryptError, status);
+  EXPECT_FALSE(video_frame);
+
+  message_loop_.RunAllPending();
+}
+
 // Test the case that the decryptor fails to decrypt the encrypted buffer but
 // cannot detect the decryption error and returns a corrupted buffer.
 TEST_F(FFmpegVideoDecoderTest, DecodeEncryptedFrame_CorruptedBufferReturned) {
   Initialize();
 
   // Simulate decoding a single encrypted frame.
   EXPECT_CALL(*demuxer_, Read(_))
       .WillRepeatedly(ReturnBuffer(encrypted_i_frame_buffer_));
   EXPECT_CALL(*decryptor_, Decrypt(encrypted_i_frame_buffer_, _))
       .WillRepeatedly(RunDecryptCB(Decryptor::kSuccess,
@@ skipping 136 matching lines @@
 
   // Signal an aborted demuxer read.
   read_cb.Run(DemuxerStream::kAborted, NULL);
 
   // Make sure we get a NULL video frame returned.
   EXPECT_CALL(*this, FrameReady(VideoDecoder::kOk, IsNull()));
   message_loop_.RunAllPending();
 }
 
 }  // namespace media