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/*
* libjingle
* Copyright 2004--2010, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "talk/sound/nullsoundsystem.h"
#include "talk/sound/sounddevicelocator.h"
#include "talk/sound/soundinputstreaminterface.h"
#include "talk/sound/soundoutputstreaminterface.h"
#include "webrtc/base/logging.h"
namespace rtc {
class Thread;
}
namespace cricket {
// 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 cricket
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