Fix initialization of AudioTrack related output parameters

media/base/android/audio_media_codec_decoder.cc

 // Copyright 2015 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/base/android/audio_media_codec_decoder.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "media/base/android/media_statistics.h"
 #include "media/base/android/sdk_media_codec_bridge.h"
@@ skipping 141 matching lines @@
                configs_.audio_seek_preroll_ns, true, media_crypto)) {
     DVLOG(0) << class_name() << "::" << __FUNCTION__
              << " failed: cannot start audio codec";
 
     media_codec_bridge_.reset();
     return kConfigFailure;
   }
 
   DVLOG(0) << class_name() << "::" << __FUNCTION__ << " succeeded";
 
+  // ConfigureAndStart() creates AudioTrack with sampling rate and channel count
+  // from |configs_|. Keep |output_...| in sync to detect the changes that might
+  // come with OnOutputFormatChanged().
+  output_sampling_rate_ = configs_.audio_sampling_rate;
+  output_num_channels_ = configs_.audio_channels;
+
   SetVolumeInternal();
 
   frame_count_ = 0;
   ResetTimestampHelper();
 
   if (!codec_created_for_tests_cb_.is_null())
     media_task_runner_->PostTask(FROM_HERE, codec_created_for_tests_cb_);
 
   return kConfigOk;
 }
@@ skipping 149 matching lines @@
   if (audio_timestamp_helper_)
     base_timestamp_ = audio_timestamp_helper_->GetTimestamp();
 
   audio_timestamp_helper_.reset(
       new AudioTimestampHelper(output_sampling_rate_));
 
   audio_timestamp_helper_->SetBaseTimestamp(base_timestamp_);
 }
 
 }  // namespace media