Return 0 instead of AVERROR_EOF for reads at or past the end of a file.

media/filters/ffmpeg_demuxer_unittest.cc

 // Copyright (c) 2011 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 "base/threading/thread.h"
 #include "media/base/filters.h"
 #include "media/base/mock_callback.h"
 #include "media/base/mock_ffmpeg.h"
@@ skipping 664 matching lines @@
   EXPECT_EQ(512, demuxer->Read(512, kBuffer));
   int64 position;
   EXPECT_TRUE(demuxer->GetPosition(&position));
   EXPECT_EQ(512, position);
 
   // Second read.
   EXPECT_EQ(512, demuxer->Read(512, kBuffer));
   EXPECT_TRUE(demuxer->GetPosition(&position));
   EXPECT_EQ(1024, position);
 
-  // Third read will get an end-of-file error.
-  EXPECT_EQ(AVERROR_EOF, demuxer->Read(512, kBuffer));
+  // Third read will get an end-of-file error, which is represented as zero.
+  EXPECT_EQ(0, demuxer->Read(512, kBuffer));
 
   // This read complete signal is generated when demuxer is stopped.
   EXPECT_CALL(*demuxer, SignalReadCompleted(DataSource::kReadError));
   demuxer->Stop(NewExpectedCallback());
   message_loop_.RunAllPending();
 }
 
 TEST_F(FFmpegDemuxerTest, ProtocolGetSetPosition) {
   {
     SCOPED_TRACE("");
@@ skipping 38 matching lines @@
   {
     SCOPED_TRACE("");
     InitializeDemuxer();
   }
   EXPECT_CALL(*data_source_, IsStreaming())
       .WillOnce(Return(false));
   EXPECT_FALSE(demuxer_->IsStreaming());
 }
 
 }  // namespace media