1 /*
2 * libjingle
3 * Copyright 2004--2010, Google Inc.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include "talk/sound/nullsoundsystem.h"
29
30 #include "talk/base/logging.h"
31 #include "talk/sound/sounddevicelocator.h"
32 #include "talk/sound/soundinputstreaminterface.h"
33 #include "talk/sound/soundoutputstreaminterface.h"
34
35 namespace talk_base {
36
37 class Thread;
38
39 }
40
41 namespace cricket {
42
43 // Name used for the single device and the sound system itself.
44 static const char kNullName[] = "null";
45
46 class NullSoundDeviceLocator : public SoundDeviceLocator {
47 public:
NullSoundDeviceLocator()48 NullSoundDeviceLocator() : SoundDeviceLocator(kNullName, kNullName) {}
49
Copy() const50 virtual SoundDeviceLocator *Copy() const {
51 return new NullSoundDeviceLocator();
52 }
53 };
54
55 class NullSoundInputStream : public SoundInputStreamInterface {
56 public:
StartReading()57 virtual bool StartReading() {
58 return true;
59 }
60
StopReading()61 virtual bool StopReading() {
62 return true;
63 }
64
GetVolume(int * volume)65 virtual bool GetVolume(int *volume) {
66 *volume = SoundSystemInterface::kMinVolume;
67 return true;
68 }
69
SetVolume(int volume)70 virtual bool SetVolume(int volume) {
71 return false;
72 }
73
Close()74 virtual bool Close() {
75 return true;
76 }
77
LatencyUsecs()78 virtual int LatencyUsecs() {
79 return 0;
80 }
81 };
82
83 class NullSoundOutputStream : public SoundOutputStreamInterface {
84 public:
EnableBufferMonitoring()85 virtual bool EnableBufferMonitoring() {
86 return true;
87 }
88
DisableBufferMonitoring()89 virtual bool DisableBufferMonitoring() {
90 return true;
91 }
92
WriteSamples(const void * sample_data,size_t size)93 virtual bool WriteSamples(const void *sample_data,
94 size_t size) {
95 LOG(LS_VERBOSE) << "Got " << size << " bytes of playback samples";
96 return true;
97 }
98
GetVolume(int * volume)99 virtual bool GetVolume(int *volume) {
100 *volume = SoundSystemInterface::kMinVolume;
101 return true;
102 }
103
SetVolume(int volume)104 virtual bool SetVolume(int volume) {
105 return false;
106 }
107
Close()108 virtual bool Close() {
109 return true;
110 }
111
LatencyUsecs()112 virtual int LatencyUsecs() {
113 return 0;
114 }
115 };
116
~NullSoundSystem()117 NullSoundSystem::~NullSoundSystem() {
118 }
119
Init()120 bool NullSoundSystem::Init() {
121 return true;
122 }
123
Terminate()124 void NullSoundSystem::Terminate() {
125 // Nothing to do.
126 }
127
EnumeratePlaybackDevices(SoundSystemInterface::SoundDeviceLocatorList * devices)128 bool NullSoundSystem::EnumeratePlaybackDevices(
129 SoundSystemInterface::SoundDeviceLocatorList *devices) {
130 ClearSoundDeviceLocatorList(devices);
131 SoundDeviceLocator *device;
132 GetDefaultPlaybackDevice(&device);
133 devices->push_back(device);
134 return true;
135 }
136
EnumerateCaptureDevices(SoundSystemInterface::SoundDeviceLocatorList * devices)137 bool NullSoundSystem::EnumerateCaptureDevices(
138 SoundSystemInterface::SoundDeviceLocatorList *devices) {
139 ClearSoundDeviceLocatorList(devices);
140 SoundDeviceLocator *device;
141 GetDefaultCaptureDevice(&device);
142 devices->push_back(device);
143 return true;
144 }
145
GetDefaultPlaybackDevice(SoundDeviceLocator ** device)146 bool NullSoundSystem::GetDefaultPlaybackDevice(
147 SoundDeviceLocator **device) {
148 *device = new NullSoundDeviceLocator();
149 return true;
150 }
151
GetDefaultCaptureDevice(SoundDeviceLocator ** device)152 bool NullSoundSystem::GetDefaultCaptureDevice(
153 SoundDeviceLocator **device) {
154 *device = new NullSoundDeviceLocator();
155 return true;
156 }
157
OpenPlaybackDevice(const SoundDeviceLocator * device,const OpenParams & params)158 SoundOutputStreamInterface *NullSoundSystem::OpenPlaybackDevice(
159 const SoundDeviceLocator *device,
160 const OpenParams ¶ms) {
161 return new NullSoundOutputStream();
162 }
163
OpenCaptureDevice(const SoundDeviceLocator * device,const OpenParams & params)164 SoundInputStreamInterface *NullSoundSystem::OpenCaptureDevice(
165 const SoundDeviceLocator *device,
166 const OpenParams ¶ms) {
167 return new NullSoundInputStream();
168 }
169
GetName() const170 const char *NullSoundSystem::GetName() const {
171 return kNullName;
172 }
173
174 } // namespace cricket
175