media/audio/fake_audio_output_stream.cc

   1 // Copyright (c) 2010 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
  10 bool FakeAudioOutputStream::has_created_fake_stream_ = false;
  11 FakeAudioOutputStream* FakeAudioOutputStream::last_fake_stream_ = NULL;
  12
  13 // static
  14 AudioOutputStream* FakeAudioOutputStream::MakeFakeStream(
  15     const AudioParameters& params) {
  16   if (!has_created_fake_stream_)
  17     base::AtExitManager::RegisterCallback(&DestroyLastFakeStream, NULL);
  18   has_created_fake_stream_ = true;
  19
  20   FakeAudioOutputStream* new_stream = new FakeAudioOutputStream(params);
  21
  22   if (last_fake_stream_) {
  23     DCHECK(last_fake_stream_->closed_);
  24     delete last_fake_stream_;
  25   }
  26   last_fake_stream_ = new_stream;
  27
  28   return new_stream;
  29 }
  30
  31 // static
  32 FakeAudioOutputStream* FakeAudioOutputStream::GetLastFakeStream() {
  33   return last_fake_stream_;
  34 }
  35
  36 bool FakeAudioOutputStream::Open() {
  37   if (packet_size_ < sizeof(int16))
  38     return false;
  39   buffer_.reset(new uint8[packet_size_]);
  40   return true;
  41 }
  42
  43 void FakeAudioOutputStream::Start(AudioSourceCallback* callback)  {
  44   callback_ = callback;
  45   memset(buffer_.get(), 0, packet_size_);
  46   callback_->OnMoreData(this, buffer_.get(), packet_size_,
  47                         AudioBuffersState(0, 0));
  48 }
  49
  50 void FakeAudioOutputStream::Stop() {
  51   callback_ = NULL;
  52 }
  53
  54 void FakeAudioOutputStream::SetVolume(double volume) {
  55   volume_ = volume;
  56 }
  57
  58 void FakeAudioOutputStream::GetVolume(double* volume) {
  59   *volume = volume_;
  60 }
  61
  62 void FakeAudioOutputStream::Close() {
  63   closed_ = true;
  64 }
  65
  66 FakeAudioOutputStream::FakeAudioOutputStream(const AudioParameters& params)
  67     : volume_(0),
  68       callback_(NULL),
  69       packet_size_(params.GetPacketSize()),
  70       closed_(false) {
  71 }
  72
  73 FakeAudioOutputStream::~FakeAudioOutputStream() {}
  74
  75 // static
  76 void FakeAudioOutputStream::DestroyLastFakeStream(void* param) {
  77   if (last_fake_stream_) {
  78     DCHECK(last_fake_stream_->closed_);
  79     delete last_fake_stream_;
  80   }
  81 }