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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "remoting/client/plugin/pepper_audio_player.h"
      6 
      7 #include <algorithm>
      8 
      9 #include "base/logging.h"
     10 #include "base/stl_util.h"
     11 
     12 // The frame size we will request from the browser.
     13 const int kFrameSizeMs = 40;
     14 
     15 namespace remoting {
     16 
     17 PepperAudioPlayer::PepperAudioPlayer(pp::Instance* instance)
     18     : instance_(instance),
     19       samples_per_frame_(0) {
     20 }
     21 
     22 PepperAudioPlayer::~PepperAudioPlayer() {
     23 }
     24 
     25 uint32 PepperAudioPlayer::GetSamplesPerFrame() {
     26   return samples_per_frame_;
     27 }
     28 
     29 bool PepperAudioPlayer::ResetAudioPlayer(
     30       AudioPacket::SamplingRate sampling_rate) {
     31   PP_AudioSampleRate pp_sampling_rate = PP_AUDIOSAMPLERATE_NONE;
     32   switch (sampling_rate) {
     33     case AudioPacket::SAMPLING_RATE_44100:
     34       pp_sampling_rate = PP_AUDIOSAMPLERATE_44100;
     35       break;
     36     case AudioPacket::SAMPLING_RATE_48000:
     37       pp_sampling_rate = PP_AUDIOSAMPLERATE_48000;
     38       break;
     39     default:
     40       LOG(ERROR) << "Unsupported audio sampling rate: " << sampling_rate;
     41       return false;
     42   }
     43 
     44   // Ask the browser/device for an appropriate frame size.
     45   samples_per_frame_ = pp::AudioConfig::RecommendSampleFrameCount(
     46       instance_, pp_sampling_rate,
     47       kFrameSizeMs * sampling_rate / base::Time::kMillisecondsPerSecond);
     48 
     49   // Create an audio configuration resource.
     50   pp::AudioConfig audio_config = pp::AudioConfig(
     51       instance_, pp_sampling_rate, samples_per_frame_);
     52 
     53   // Create an audio resource.
     54   audio_ = pp::Audio(instance_, audio_config, AudioPlayerCallback, this);
     55 
     56   // Immediately start the player.
     57   bool success = audio_.StartPlayback();
     58   if (!success)
     59     LOG(ERROR) << "Failed to start Pepper audio player";
     60   return success;
     61 }
     62 
     63 }  // namespace remoting
     64