remoting/client/plugin/pepper_audio_player.cc

   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