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/*
* Copyright 2004 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "webrtc/sound/nullsoundsystem.h"
#include "webrtc/sound/sounddevicelocator.h"
#include "webrtc/sound/soundinputstreaminterface.h"
#include "webrtc/sound/soundoutputstreaminterface.h"
#include "webrtc/base/logging.h"
namespace rtc {
class Thread;
}
namespace rtc {
// Name used for the single device and the sound system itself.
static const char kNullName[] = "null";
class NullSoundDeviceLocator : public SoundDeviceLocator {
public:
NullSoundDeviceLocator() : SoundDeviceLocator(kNullName, kNullName) {}
virtual SoundDeviceLocator *Copy() const {
return new NullSoundDeviceLocator();
}
};
class NullSoundInputStream : public SoundInputStreamInterface {
public:
virtual bool StartReading() {
return true;
}
virtual bool StopReading() {
return true;
}
virtual bool GetVolume(int *volume) {
*volume = SoundSystemInterface::kMinVolume;
return true;
}
virtual bool SetVolume(int volume) {
return false;
}
virtual bool Close() {
return true;
}
virtual int LatencyUsecs() {
return 0;
}
};
class NullSoundOutputStream : public SoundOutputStreamInterface {
public:
virtual bool EnableBufferMonitoring() {
return true;
}
virtual bool DisableBufferMonitoring() {
return true;
}
virtual bool WriteSamples(const void *sample_data,
size_t size) {
LOG(LS_VERBOSE) << "Got " << size << " bytes of playback samples";
return true;
}
virtual bool GetVolume(int *volume) {
*volume = SoundSystemInterface::kMinVolume;
return true;
}
virtual bool SetVolume(int volume) {
return false;
}
virtual bool Close() {
return true;
}
virtual int LatencyUsecs() {
return 0;
}
};
NullSoundSystem::~NullSoundSystem() {
}
bool NullSoundSystem::Init() {
return true;
}
void NullSoundSystem::Terminate() {
// Nothing to do.
}
bool NullSoundSystem::EnumeratePlaybackDevices(
SoundSystemInterface::SoundDeviceLocatorList *devices) {
ClearSoundDeviceLocatorList(devices);
SoundDeviceLocator *device;
GetDefaultPlaybackDevice(&device);
devices->push_back(device);
return true;
}
bool NullSoundSystem::EnumerateCaptureDevices(
SoundSystemInterface::SoundDeviceLocatorList *devices) {
ClearSoundDeviceLocatorList(devices);
SoundDeviceLocator *device;
GetDefaultCaptureDevice(&device);
devices->push_back(device);
return true;
}
bool NullSoundSystem::GetDefaultPlaybackDevice(
SoundDeviceLocator **device) {
*device = new NullSoundDeviceLocator();
return true;
}
bool NullSoundSystem::GetDefaultCaptureDevice(
SoundDeviceLocator **device) {
*device = new NullSoundDeviceLocator();
return true;
}
SoundOutputStreamInterface *NullSoundSystem::OpenPlaybackDevice(
const SoundDeviceLocator *device,
const OpenParams ¶ms) {
return new NullSoundOutputStream();
}
SoundInputStreamInterface *NullSoundSystem::OpenCaptureDevice(
const SoundDeviceLocator *device,
const OpenParams ¶ms) {
return new NullSoundInputStream();
}
const char *NullSoundSystem::GetName() const {
return kNullName;
}
} // namespace rtc
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