Encrypted Media: Support Audio Decrypt-Only.

media/filters/audio_decoder_selector_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 <vector>
+
+#include "base/bind.h"
+#include "base/message_loop.h"
+#include "media/base/gmock_callback_support.h"
+#include "media/base/mock_filters.h"
+#include "media/filters/audio_decoder_selector.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using ::testing::_;
+using ::testing::IsNull;
+using ::testing::NiceMock;
+using ::testing::NotNull;
+using ::testing::Return;
+using ::testing::ReturnRef;
+using ::testing::StrictMock;
+
+namespace media {
+
+class AudioDecoderSelectorTest : public ::testing::Test {
+ public:
+  enum DecryptorCapability {
+    kNoDecryptor,
+    kDecryptOnly,
+    kDecryptAndDecode
+  };
+
+  AudioDecoderSelectorTest()
+      : clear_audio_config_(
+            kCodecVorbis, 16, CHANNEL_LAYOUT_STEREO, 44100, NULL, 0, false),
+        encrypted_audio_config_(
+            kCodecVorbis, 16, CHANNEL_LAYOUT_STEREO, 44100, NULL, 0, true),
+        demuxer_stream_(new StrictMock<MockDemuxerStream>()),
+        decryptor_(new NiceMock<MockDecryptor>()),
+        decoder_1_(new StrictMock<MockAudioDecoder>()),
+        decoder_2_(new StrictMock<MockAudioDecoder>()) {
+    all_decoders_.push_back(decoder_1_);
+    all_decoders_.push_back(decoder_2_);
+
+    EXPECT_CALL(*demuxer_stream_, type())
+        .WillRepeatedly(Return(DemuxerStream::AUDIO));
+  }
+
+  MOCK_METHOD1(OnStatistics, void(const PipelineStatistics&));
+  MOCK_METHOD1(SetDecryptorReadyCallback, void(const media::DecryptorReadyCB&));
+  MOCK_METHOD2(OnDecoderSelected,
+               void(const scoped_refptr<AudioDecoder>&,
+                    const scoped_refptr<DecryptingDemuxerStream>&));
+
+  void UseClearStream() {
+    EXPECT_CALL(*demuxer_stream_, audio_decoder_config())
+        .WillRepeatedly(ReturnRef(clear_audio_config_));
+  }
+
+  void UseEncryptedStream() {
+    EXPECT_CALL(*demuxer_stream_, audio_decoder_config())
+        .WillRepeatedly(ReturnRef(encrypted_audio_config_));
+  }
+
+  void InitializeDecoderSelector(DecryptorCapability decryptor_capability,
+                                 int num_decoders) {
+    SetDecryptorReadyCB set_decryptor_ready_cb;
+    if (decryptor_capability == kDecryptOnly ||
+        decryptor_capability == kDecryptAndDecode) {
+      set_decryptor_ready_cb = base::Bind(
+          &AudioDecoderSelectorTest::SetDecryptorReadyCallback,
+          base::Unretained(this));
+
+      EXPECT_CALL(*this, SetDecryptorReadyCallback(_))
+          .WillRepeatedly(RunCallback<0>(decryptor_.get()));
+
+      if (decryptor_capability == kDecryptOnly) {
+        EXPECT_CALL(*decryptor_, InitializeAudioDecoderMock(_, _))
+            .WillRepeatedly(RunCallback<1>(false));
+      } else {
+        EXPECT_CALL(*decryptor_, InitializeAudioDecoderMock(_, _))
+            .WillRepeatedly(RunCallback<1>(true));
+      }
+    }
+
+    DCHECK_GE(all_decoders_.size(), static_cast<size_t>(num_decoders));
+    AudioDecoderSelector::AudioDecoderList decoders(
+        all_decoders_.begin(), all_decoders_.begin() + num_decoders);
+
+    decoder_selector_.reset(new AudioDecoderSelector(
+        message_loop_.message_loop_proxy(),
+        decoders,
+        set_decryptor_ready_cb));
+  }
+
+  void SelectDecoder() {
+    decoder_selector_->SelectAudioDecoder(
+        demuxer_stream_,
+        base::Bind(&AudioDecoderSelectorTest::OnStatistics,
+                   base::Unretained(this)),
+        base::Bind(&AudioDecoderSelectorTest::OnDecoderSelected,
+                   base::Unretained(this)));
+    message_loop_.RunUntilIdle();
+  }
+
+  // Fixture members.
+  scoped_ptr<AudioDecoderSelector> decoder_selector_;
+  AudioDecoderConfig clear_audio_config_;
+  AudioDecoderConfig encrypted_audio_config_;
+  scoped_refptr<StrictMock<MockDemuxerStream> > demuxer_stream_;
+  // Use NiceMock since we don't care about most of calls on the decryptor, e.g.
+  // RegisterKeyAddedCB().
+  scoped_ptr<NiceMock<MockDecryptor> > decryptor_;
+  scoped_refptr<StrictMock<MockAudioDecoder> > decoder_1_;
+  scoped_refptr<StrictMock<MockAudioDecoder> > decoder_2_;
+  std::vector<scoped_refptr<AudioDecoder> > all_decoders_;
+  MessageLoop message_loop_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AudioDecoderSelectorTest);
+};
+
+// The stream is not encrypted but we have no clear decoder. No decoder can be
+// selected.
+TEST_F(AudioDecoderSelectorTest, ClearStream_NoDecryptor_NoClearDecoder) {
+  UseClearStream();
+  InitializeDecoderSelector(kNoDecryptor, 0);
+
+  EXPECT_CALL(*this, OnDecoderSelected(IsNull(), IsNull()));
+
+  SelectDecoder();
+}
+
+// The stream is not encrypted and we have one clear decoder. The decoder
+// will be selected.
+TEST_F(AudioDecoderSelectorTest, ClearStream_NoDecryptor_OneClearDecoder) {
+  UseClearStream();
+  InitializeDecoderSelector(kNoDecryptor, 1);
+
+  EXPECT_CALL(*decoder_1_, Initialize(_, _, _))
+      .WillOnce(RunCallback<1>(PIPELINE_OK));
+  EXPECT_CALL(*this, OnDecoderSelected(scoped_refptr<AudioDecoder>(decoder_1_),
+                                       IsNull()));
+
+  SelectDecoder();
+}
+
+// The stream is not encrypted and we have multiple clear decoders. The first
+// decoder that can decode the input stream will be selected.
+TEST_F(AudioDecoderSelectorTest, ClearStream_NoDecryptor_MultipleClearDecoder) {
+  UseClearStream();
+  InitializeDecoderSelector(kNoDecryptor, 2);
+
+  EXPECT_CALL(*decoder_1_, Initialize(_, _, _))
+      .WillOnce(RunCallback<1>(DECODER_ERROR_NOT_SUPPORTED));
+  EXPECT_CALL(*decoder_2_, Initialize(_, _, _))
+      .WillOnce(RunCallback<1>(PIPELINE_OK));
+  EXPECT_CALL(*this, OnDecoderSelected(scoped_refptr<AudioDecoder>(decoder_2_),
+                                       IsNull()));
+
+  SelectDecoder();
+}
+
+// There is a decryptor but the stream is not encrypted. The decoder will be

[ddorwin, 2012/12/14 05:17:01]

Why does the decryptor get initialized (line 77) in this case? No DAD should be
created if the stream is not encrypted, right?

[xhwang, 2012/12/14 05:50:07]

line 77 has WillRepeatedly(), so we allow the function to be called or not
called. In this case, it's not called. I didn't enforce to check if
decryptor->InitializeAudioDecoder() is called or not since that's implementation
detail.

For the same reason, in this test, DAD is not created, but I didn't check.

+// selected.
+TEST_F(AudioDecoderSelectorTest, ClearStream_HasDecryptor) {
+  UseClearStream();
+  InitializeDecoderSelector(kDecryptOnly, 1);
+
+  EXPECT_CALL(*decoder_1_, Initialize(_, _, _))
+      .WillOnce(RunCallback<1>(PIPELINE_OK));
+  EXPECT_CALL(*this, OnDecoderSelected(scoped_refptr<AudioDecoder>(decoder_1_),
+                                       IsNull()));
+
+  SelectDecoder();
+}
+
+// The stream is encrypted and there's no decryptor. No decoder can be selected.
+TEST_F(AudioDecoderSelectorTest, EncryptedStream_NoDecryptor) {
+  UseEncryptedStream();
+  InitializeDecoderSelector(kNoDecryptor, 1);
+
+  EXPECT_CALL(*this, OnDecoderSelected(IsNull(), IsNull()));
+
+  SelectDecoder();
+}
+
+// Decryptor can only do decryption and there's no decoder available. No decoder
+// can be selected.
+TEST_F(AudioDecoderSelectorTest, EncryptedStream_DecryptOnly_NoClearDecoder) {
+  UseEncryptedStream();
+  InitializeDecoderSelector(kDecryptOnly, 0);
+
+  EXPECT_CALL(*this, OnDecoderSelected(IsNull(), IsNull()));
+
+  SelectDecoder();
+}
+
+// Decryptor can do decryption-only and there's a decoder available. The decoder
+// will be selected and a DecryptingDemuxerStream will be created.
+TEST_F(AudioDecoderSelectorTest, EncryptedStream_DecryptOnly_OneClearDecoder) {
+  UseEncryptedStream();
+  InitializeDecoderSelector(kDecryptOnly, 1);
+
+  EXPECT_CALL(*decoder_1_, Initialize(_, _, _))
+      .WillOnce(RunCallback<1>(PIPELINE_OK));
+  EXPECT_CALL(*this, OnDecoderSelected(scoped_refptr<AudioDecoder>(decoder_1_),
+                                       NotNull()));
+
+  SelectDecoder();
+}
+
+// Decryptor can only do decryption and there are multiple decoders available.
+// The first decoder that can decode the input stream will be selected and
+// a DecryptingDemuxerStream will be created.
+TEST_F(AudioDecoderSelectorTest,
+       EncryptedStream_DecryptOnly_MultipleClearDecoder) {
+  UseEncryptedStream();
+  InitializeDecoderSelector(kDecryptOnly, 2);
+
+  EXPECT_CALL(*decoder_1_, Initialize(_, _, _))
+      .WillOnce(RunCallback<1>(DECODER_ERROR_NOT_SUPPORTED));
+  EXPECT_CALL(*decoder_2_, Initialize(_, _, _))
+      .WillOnce(RunCallback<1>(PIPELINE_OK));
+  EXPECT_CALL(*this, OnDecoderSelected(scoped_refptr<AudioDecoder>(decoder_2_),
+                                       NotNull()));
+
+  SelectDecoder();
+}
+
+// Decryptor can do decryption and decoding. A DecryptingAudioDecoder will be
+// created and selected. The clear decoders should not be touched at all.
+// No DecryptingDemuxerStream should to be created.
+TEST_F(AudioDecoderSelectorTest, EncryptedStream_DecryptAndDecode) {
+  UseEncryptedStream();
+  InitializeDecoderSelector(kDecryptAndDecode, 1);
+
+  EXPECT_CALL(*this, OnDecoderSelected(NotNull(), IsNull()));
+
+  SelectDecoder();
+}
+
+}  // namespace media