AudioConverter: Express delay in frames rather than msec.

extensions/renderer/api/display_source/wifi_display/wifi_display_audio_encoder_lpcm.cc

 // Copyright 2016 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 "extensions/renderer/api/display_source/wifi_display/wifi_display_audio_encoder.h"
 
 #include <memory>
 #include <vector>
 
 #include "base/logging.h"
@@ skipping 33 matching lines @@
   // WiFiDisplayMediaEncoder
   WiFiDisplayElementaryStreamInfo CreateElementaryStreamInfo() const override;
 
   // content::MediaStreamAudioSink
   void OnData(const media::AudioBus& input_bus,
               base::TimeTicks estimated_capture_time) override;
   void OnSetFormat(const media::AudioParameters& params) override;
 
   // media::AudioConverter::InputCallback
   double ProvideInput(media::AudioBus* audio_bus,
-                      base::TimeDelta buffer_delay) override;
+                      uint32_t frames_delayed) override;
 
   LPCMAudioStreamDescriptor::SamplingFrequency GetOutputSamplingFrequency()
       const;
 
  private:
   const int output_sample_rate_;
 
   // These members are accessed on the real-time audio time only.
   std::unique_ptr<media::AudioConverter> converter_;
   const media::AudioBus* current_input_bus_;
@@ skipping 133 matching lines @@
   fifo_bus_ = media::AudioBus::Create(
       kOutputChannels,
       WiFiDisplayMediaPacketizer::LPCM::kChannelSamplesPerUnit);
   fifo_end_frame_ = 0;
   fifo_frames_out_ = 0;
   input_frames_in_ = 0;
 }
 
 // Called on real-time audio thread by |converter_| invoked by |OnData|.
 double WiFiDisplayAudioEncoderLPCM::ProvideInput(media::AudioBus* audio_bus,
-                                                 base::TimeDelta buffer_delay) {
+                                                 uint32_t frames_delayed) {
   DCHECK(current_input_bus_);
   current_input_bus_->CopyTo(audio_bus);
   current_input_bus_ = nullptr;
   return 1.0;
 }
 
 LPCMAudioStreamDescriptor::SamplingFrequency
 WiFiDisplayAudioEncoderLPCM::GetOutputSamplingFrequency() const {
   switch (GetAudioCodecMode()) {
     case wds::LPCM_44_1K_16B_2CH:
       return LPCMAudioStreamDescriptor::SAMPLING_FREQUENCY_44_1K;
     case wds::LPCM_48K_16B_2CH:
       return LPCMAudioStreamDescriptor::SAMPLING_FREQUENCY_48K;
     default:
       NOTREACHED();
       return LPCMAudioStreamDescriptor::SAMPLING_FREQUENCY_44_1K;
   }
 }
 
 }  // namespace
 
 void WiFiDisplayAudioEncoder::CreateLPCM(
     const wds::AudioCodec& audio_codec,
     const AudioEncoderCallback& encoder_callback) {
   encoder_callback.Run(
       make_scoped_refptr(new WiFiDisplayAudioEncoderLPCM(audio_codec)));
 }
 
 }  // namespace extensions