Pipeline will execute a callback whenever an run-time error has happened.

media/base/pipeline_impl_unittest.cc

 // Copyright (c) 2006-2009 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 <string>
 
 #include "base/waitable_event.h"
 #include "media/base/pipeline_impl.h"
 #include "media/base/media_format.h"
 #include "media/base/filters.h"
@@ skipping 14 matching lines @@
 // Used for setting expectations on pipeline callbacks.  Using a StrictMock
 // also lets us test for missing callbacks.
 class CallbackHelper {
  public:
   CallbackHelper() {}
   virtual ~CallbackHelper() {}
 
   MOCK_METHOD0(OnStart, void());
   MOCK_METHOD0(OnSeek, void());
   MOCK_METHOD0(OnStop, void());
+  MOCK_METHOD0(OnError, void());
 
  private:
   DISALLOW_COPY_AND_ASSIGN(CallbackHelper);
 };
 
 // TODO(scherkus): even though some filters are initialized on separate
 // threads these test aren't flaky... why?  It's because filters' Initialize()
 // is executed on |message_loop_| and the mock filters instantly call
 // InitializationComplete(), which keeps the pipeline humming along.  If
 // either filters don't call InitializationComplete() immediately or filter
 // initialization is moved to a separate thread this test will become flaky.
 class PipelineImplTest : public ::testing::Test {
  public:
   PipelineImplTest()
       : pipeline_(new PipelineImpl(&message_loop_)),
         mocks_(new MockFilterFactory()) {
+    pipeline_->SetPipelineErrorCallback(NewCallback(
+        reinterpret_cast<CallbackHelper*>(&callbacks_),
+        &CallbackHelper::OnError));
   }
 
   virtual ~PipelineImplTest() {
     if (!pipeline_->IsRunning()) {
       return;
     }
 
     // Expect a stop callback if we were started.
     EXPECT_CALL(callbacks_, OnStop());
     pipeline_->Stop(NewCallback(reinterpret_cast<CallbackHelper*>(&callbacks_),
@@ skipping 166 matching lines @@
   EXPECT_EQ(PIPELINE_OK, pipeline_->GetError());
 
   // Because our callback will get executed when the test tears down, we'll
   // verify that nothing has been called, then set our expectation for the call
   // made during tear down.
   Mock::VerifyAndClear(&callbacks_);
   EXPECT_CALL(callbacks_, OnStart());
 }
 
 TEST_F(PipelineImplTest, RequiredFilterMissing) {
+  EXPECT_CALL(callbacks_, OnError());
   mocks_->set_creation_successful(false);
 
   InitializePipeline();
   EXPECT_FALSE(pipeline_->IsInitialized());
   EXPECT_EQ(PIPELINE_ERROR_REQUIRED_FILTER_MISSING,
             pipeline_->GetError());
 }
 
 TEST_F(PipelineImplTest, URLNotFound) {
   EXPECT_CALL(*mocks_->data_source(), Initialize("", NotNull()))
       .WillOnce(DoAll(SetError(mocks_->data_source(),
                                PIPELINE_ERROR_URL_NOT_FOUND),
                       Invoke(&RunFilterCallback)));
+  EXPECT_CALL(callbacks_, OnError());
   EXPECT_CALL(*mocks_->data_source(), Stop());
 
   InitializePipeline();
   EXPECT_FALSE(pipeline_->IsInitialized());
   EXPECT_EQ(PIPELINE_ERROR_URL_NOT_FOUND, pipeline_->GetError());
 }
 
 TEST_F(PipelineImplTest, NoStreams) {
   // Manually set these expectations because SetPlaybackRate() is not called if
   // we cannot fully initialize the pipeline.
   EXPECT_CALL(*mocks_->data_source(), Initialize("", NotNull()))
       .WillOnce(Invoke(&RunFilterCallback));
   EXPECT_CALL(*mocks_->data_source(), Stop());
 
   EXPECT_CALL(*mocks_->demuxer(), Initialize(mocks_->data_source(), NotNull()))
       .WillOnce(Invoke(&RunFilterCallback));
   EXPECT_CALL(*mocks_->demuxer(), GetNumberOfStreams())
       .WillRepeatedly(Return(0));
   EXPECT_CALL(*mocks_->demuxer(), Stop());
+  EXPECT_CALL(callbacks_, OnError());
 
   InitializePipeline();
   EXPECT_FALSE(pipeline_->IsInitialized());
   EXPECT_EQ(PIPELINE_ERROR_COULD_NOT_RENDER, pipeline_->GetError());
 }
 
 TEST_F(PipelineImplTest, AudioStream) {
   scoped_refptr<StrictMock<MockDemuxerStream> > stream =
       new StrictMock<MockDemuxerStream>("audio/x-foo");
   MockDemuxerStreamVector streams;
@@ skipping 112 matching lines @@
   // The audio renderer should receive a call to SetVolume().
   float expected = 0.5f;
   EXPECT_CALL(*mocks_->audio_renderer(), SetVolume(expected));
 
   // Initialize then set volume!
   InitializePipeline();
   pipeline_->SetVolume(expected);
 }
 
 }  // namespace media