Remove AudioBuffersState usage in Chromium

media/audio/audio_output_resampler.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/audio/audio_output_resampler.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/compiler_specific.h"
 #include "base/metrics/histogram.h"
+#include "base/numerics/safe_conversions.h"
 #include "base/single_thread_task_runner.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_output_dispatcher_impl.h"
 #include "media/audio/audio_output_proxy.h"
 #include "media/audio/sample_rates.h"
 #include "media/base/audio_converter.h"
 #include "media/base/limits.h"
 
 namespace media {
 
 class OnMoreDataConverter
     : public AudioOutputStream::AudioSourceCallback,
       public AudioConverter::InputCallback {
  public:
   OnMoreDataConverter(const AudioParameters& input_params,
                       const AudioParameters& output_params);
   virtual ~OnMoreDataConverter();
 
   // AudioSourceCallback interface.
   virtual int OnMoreData(AudioBus* dest,
-                         AudioBuffersState buffers_state) OVERRIDE;
+                         uint32 total_bytes_delay) OVERRIDE;
   virtual void OnError(AudioOutputStream* stream) OVERRIDE;
 
   // Sets |source_callback_|.  If this is not a new object, then Stop() must be
   // called before Start().
   void Start(AudioOutputStream::AudioSourceCallback* callback);
 
   // Clears |source_callback_| and flushes the resampler.
   void Stop();
 
   bool started() { return source_callback_ != nullptr; }
 
  private:
   // AudioConverter::InputCallback implementation.
   virtual double ProvideInput(AudioBus* audio_bus,
                               base::TimeDelta buffer_delay) OVERRIDE;
 
   // Ratio of input bytes to output bytes used to correct playback delay with
   // regard to buffering and resampling.
   const double io_ratio_;
 
   // Source callback.
   AudioOutputStream::AudioSourceCallback* source_callback_;
 
-  // Last AudioBuffersState object received via OnMoreData(), used to correct
+  // Last |total_bytes_delay| received via OnMoreData(), used to correct
   // playback delay by ProvideInput() and passed on to |source_callback_|.
-  AudioBuffersState current_buffers_state_;
+  uint32 current_total_bytes_delay_;
 
   const int input_bytes_per_second_;
 
   // Handles resampling, buffering, and channel mixing between input and output
   // parameters.
   AudioConverter audio_converter_;
 
   DISALLOW_COPY_AND_ASSIGN(OnMoreDataConverter);
 };
 
@@ skipping 250 matching lines @@
   audio_converter_.AddInput(this);
 }
 
 void OnMoreDataConverter::Stop() {
   CHECK(source_callback_);
   source_callback_ = nullptr;
   audio_converter_.RemoveInput(this);
 }
 
 int OnMoreDataConverter::OnMoreData(AudioBus* dest,
-                                    AudioBuffersState buffers_state) {
-  current_buffers_state_ = buffers_state;
+                                    uint32 total_bytes_delay) {
+  current_total_bytes_delay_ = total_bytes_delay;
   audio_converter_.Convert(dest);
 
   // Always return the full number of frames requested, ProvideInput()
   // will pad with silence if it wasn't able to acquire enough data.
   return dest->frames();
 }
 
 double OnMoreDataConverter::ProvideInput(AudioBus* dest,
                                          base::TimeDelta buffer_delay) {
   // Adjust playback delay to include |buffer_delay|.
   // TODO(dalecurtis): Stop passing bytes around, it doesn't make sense since
   // AudioBus is just float data.  Use TimeDelta instead.
-  AudioBuffersState new_buffers_state;
-  new_buffers_state.pending_bytes =
-      io_ratio_ * (current_buffers_state_.total_bytes() +
-                   buffer_delay.InSecondsF() * input_bytes_per_second_);
+  uint32 new_total_bytes_delay = base::saturated_cast<uint32>(
+      io_ratio_ * (current_total_bytes_delay_ +
+                   buffer_delay.InSecondsF() * input_bytes_per_second_));
 
   // Retrieve data from the original callback.
-  const int frames = source_callback_->OnMoreData(dest, new_buffers_state);
+  const int frames = source_callback_->OnMoreData(dest, new_total_bytes_delay);
 
   // Zero any unfilled frames if anything was filled, otherwise we'll just
   // return a volume of zero and let AudioConverter drop the output.
   if (frames > 0 && frames < dest->frames())
     dest->ZeroFramesPartial(frames, dest->frames() - frames);
   return frames > 0 ? 1 : 0;
 }
 
 void OnMoreDataConverter::OnError(AudioOutputStream* stream) {
   source_callback_->OnError(stream);
 }
 
 }  // namespace media