media/audio/fake_audio_output_stream.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 "media/audio/fake_audio_output_stream.h"
   6
   7 #include "base/at_exit.h"
   8 #include "base/logging.h"
   9 #include "media/audio/audio_manager_base.h"
  10
  11 namespace media {
  12
  13 FakeAudioOutputStream* FakeAudioOutputStream::current_fake_stream_ = NULL;
  14
  15 // static
  16 AudioOutputStream* FakeAudioOutputStream::MakeFakeStream(
  17     AudioManagerBase* manager,
  18     const AudioParameters& params) {
  19   FakeAudioOutputStream* new_stream = new FakeAudioOutputStream(manager,
  20                                                                 params);
  21   DCHECK(current_fake_stream_ == NULL);
  22   current_fake_stream_ = new_stream;
  23   return new_stream;
  24 }
  25
  26 bool FakeAudioOutputStream::Open() {
  27   if (bytes_per_buffer_ < sizeof(int16))
  28     return false;
  29   buffer_.reset(new uint8[bytes_per_buffer_]);
  30   return true;
  31 }
  32
  33 // static
  34 FakeAudioOutputStream* FakeAudioOutputStream::GetCurrentFakeStream() {
  35   return current_fake_stream_;
  36 }
  37
  38 void FakeAudioOutputStream::Start(AudioSourceCallback* callback)  {
  39   callback_ = callback;
  40   memset(buffer_.get(), 0, bytes_per_buffer_);
  41   callback_->OnMoreData(this, buffer_.get(), bytes_per_buffer_,
  42                         AudioBuffersState(0, 0));
  43 }
  44
  45 void FakeAudioOutputStream::Stop() {
  46   callback_ = NULL;
  47 }
  48
  49 void FakeAudioOutputStream::SetVolume(double volume) {
  50   volume_ = volume;
  51 }
  52
  53 void FakeAudioOutputStream::GetVolume(double* volume) {
  54   *volume = volume_;
  55 }
  56
  57 void FakeAudioOutputStream::Close() {
  58   closed_ = true;
  59   audio_manager_->ReleaseOutputStream(this);
  60 }
  61
  62 FakeAudioOutputStream::FakeAudioOutputStream(AudioManagerBase* manager,
  63                                              const AudioParameters& params)
  64     : audio_manager_(manager),
  65       volume_(0),
  66       callback_(NULL),
  67       bytes_per_buffer_(params.GetBytesPerBuffer()),
  68       closed_(false) {
  69 }
  70
  71 FakeAudioOutputStream::~FakeAudioOutputStream() {
  72   if (current_fake_stream_ == this)
  73     current_fake_stream_ = NULL;
  74 }
  75
  76 }  // namespace media