media/base/fake_audio_renderer_sink.cc

   1 // Copyright 2013 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 "media/base/fake_audio_renderer_sink.h"
   6
   7 #include "base/logging.h"
   8
   9 namespace media {
  10
  11 FakeAudioRendererSink::FakeAudioRendererSink()
  12     : state_(kUninitialized),
  13       callback_(NULL) {
  14 }
  15
  16 FakeAudioRendererSink::~FakeAudioRendererSink() {
  17   DCHECK(!callback_);
  18 }
  19
  20 void FakeAudioRendererSink::Initialize(const AudioParameters& params,
  21                                        RenderCallback* callback) {
  22   DCHECK_EQ(state_, kUninitialized);
  23   DCHECK(!callback_);
  24   DCHECK(callback);
  25
  26   callback_ = callback;
  27   ChangeState(kInitialized);
  28 }
  29
  30 void FakeAudioRendererSink::Start() {
  31   DCHECK_EQ(state_, kInitialized);
  32   ChangeState(kStarted);
  33 }
  34
  35 void FakeAudioRendererSink::Stop() {
  36   callback_ = NULL;
  37   ChangeState(kStopped);
  38 }
  39
  40 void FakeAudioRendererSink::Pause() {
  41   DCHECK(state_ == kStarted || state_ == kPlaying) << "state_ " << state_;
  42   ChangeState(kPaused);
  43 }
  44
  45 void FakeAudioRendererSink::Play() {
  46   DCHECK(state_ == kStarted || state_ == kPaused) << "state_ " << state_;
  47   DCHECK_EQ(state_, kPaused);
  48   ChangeState(kPlaying);
  49 }
  50
  51 bool FakeAudioRendererSink::SetVolume(double volume) {
  52   return true;
  53 }
  54
  55 bool FakeAudioRendererSink::Render(AudioBus* dest, int audio_delay_milliseconds,
  56                                    int* frames_written) {
  57   if (state_ != kPlaying)
  58     return false;
  59
  60   *frames_written = callback_->Render(dest, audio_delay_milliseconds);
  61   return true;
  62 }
  63
  64 void FakeAudioRendererSink::OnRenderError() {
  65   DCHECK_NE(state_, kUninitialized);
  66   DCHECK_NE(state_, kStopped);
  67
  68   callback_->OnRenderError();
  69 }
  70
  71 void FakeAudioRendererSink::ChangeState(State new_state) {
  72   static const char* kStateNames[] = {
  73     "kUninitialized",
  74     "kInitialized",
  75     "kStarted",
  76     "kPaused",
  77     "kPlaying",
  78     "kStopped"
  79   };
  80
  81   DVLOG(1) << __FUNCTION__ << " : "
  82            << kStateNames[state_] << " -> " << kStateNames[new_state];
  83   state_ = new_state;
  84 }
  85
  86 }  // namespace media