Support start trimming post-decoding. Use it with FFmpegDemuxer.

media/filters/pipeline_integration_test.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 "media/filters/pipeline_integration_test_base.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_util.h"
@@ skipping 837 matching lines @@
   EXPECT_EQ(640, source.last_timestamp_offset().InMilliseconds());
   EXPECT_EQ(1u, pipeline_->GetBufferedTimeRanges().size());
   EXPECT_EQ(0, pipeline_->GetBufferedTimeRanges().start(0).InMilliseconds());
   EXPECT_EQ(640, pipeline_->GetBufferedTimeRanges().end(0).InMilliseconds());
 
   Play();
 
   EXPECT_TRUE(WaitUntilOnEnded());
 }
 
+TEST_F(PipelineIntegrationTest, BasicPlaybackHashed_MP3) {
+  ASSERT_TRUE(Start(GetTestDataFilePath("sfx.mp3"), PIPELINE_OK, kHashed));
+
+  Play();
+
+  ASSERT_TRUE(WaitUntilOnEnded());
+
+  // Verify codec delay and preroll are stripped.
+  EXPECT_EQ("3.05,2.87,3.00,3.32,3.58,4.08,", GetAudioHash());
+}
+
 TEST_P(PipelineIntegrationTest, MediaSource_MP3) {
   MockMediaSource source("sfx.mp3", kMP3, kAppendWholeFile, GetParam());
   StartHashedPipelineWithMediaSource(&source);
   source.EndOfStream();
 
   EXPECT_EQ(1u, pipeline_->GetBufferedTimeRanges().size());
   EXPECT_EQ(0, pipeline_->GetBufferedTimeRanges().start(0).InMilliseconds());
   EXPECT_EQ(313, pipeline_->GetBufferedTimeRanges().end(0).InMilliseconds());
 
   Play();
@@ skipping 414 matching lines @@
   Play();
   ASSERT_TRUE(WaitUntilOnEnded());
 }
 
 // TODO(wolenetz): Enable MSE testing of new frame processor based on this flag,
 // once the new processor has landed. See http://crbug.com/249422.
 INSTANTIATE_TEST_CASE_P(LegacyFrameProcessor, PipelineIntegrationTest,
                         Values(true));
 
 }  // namespace media