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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/audio/win/audio_session_event_listener_win.h"
#include "base/logging.h"
namespace media {
AudioSessionEventListener::AudioSessionEventListener(
IAudioClient* client,
base::OnceClosure device_change_cb)
: device_change_cb_(std::move(device_change_cb)) {
DCHECK(device_change_cb_);
HRESULT hr = client->GetService(IID_PPV_ARGS(&audio_session_control_));
if (FAILED(hr)) {
DLOG(ERROR) << "Failed to get IAudioSessionControl service.";
return;
}
audio_session_control_->RegisterAudioSessionNotification(this);
}
AudioSessionEventListener::~AudioSessionEventListener() {
if (!audio_session_control_)
return;
HRESULT hr = audio_session_control_->UnregisterAudioSessionNotification(this);
DLOG_IF(ERROR, FAILED(hr))
<< "UnregisterAudioSessionNotification() failed: " << std::hex << hr;
}
ULONG AudioSessionEventListener::AddRef() {
return 1; // Class is owned in Chromium code and should have no outside refs.
}
ULONG AudioSessionEventListener::Release() {
return 1; // Class is owned in Chromium code and should have no outside refs.
}
HRESULT AudioSessionEventListener::QueryInterface(REFIID iid, void** object) {
if (iid == IID_IUnknown || iid == __uuidof(IAudioSessionEvents)) {
*object = static_cast<IAudioSessionEvents*>(this);
return S_OK;
}
*object = nullptr;
return E_NOINTERFACE;
}
HRESULT AudioSessionEventListener::OnChannelVolumeChanged(
DWORD channel_count,
float new_channel_volume_array[],
DWORD changed_channel,
LPCGUID event_context) {
return S_OK;
}
IFACEMETHODIMP
AudioSessionEventListener::OnDisplayNameChanged(LPCWSTR new_display_name,
LPCGUID event_context) {
return S_OK;
}
HRESULT AudioSessionEventListener::OnGroupingParamChanged(
LPCGUID new_grouping_param,
LPCGUID event_context) {
return S_OK;
}
HRESULT AudioSessionEventListener::OnIconPathChanged(LPCWSTR new_icon_path,
LPCGUID event_context) {
return S_OK;
}
HRESULT AudioSessionEventListener::OnSessionDisconnected(
AudioSessionDisconnectReason disconnect_reason) {
DVLOG(1) << __func__ << ": " << disconnect_reason;
if (device_change_cb_)
std::move(device_change_cb_).Run();
return S_OK;
}
HRESULT AudioSessionEventListener::OnSimpleVolumeChanged(
float new_volume,
BOOL new_mute,
LPCGUID event_context) {
return S_OK;
}
HRESULT AudioSessionEventListener::OnStateChanged(AudioSessionState new_state) {
return S_OK;
}
} // namespace media
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