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 #ifndef TALK_SOUND_ALSASOUNDSYSTEM_H_ 29 #define TALK_SOUND_ALSASOUNDSYSTEM_H_ 30 31 #include "talk/base/constructormagic.h" 32 #include "talk/sound/alsasymboltable.h" 33 #include "talk/sound/soundsysteminterface.h" 34 35 namespace cricket { 36 37 class AlsaStream; 38 class AlsaInputStream; 39 class AlsaOutputStream; 40 41 // Sound system implementation for ALSA, the predominant sound device API on 42 // Linux (but typically not used directly by applications anymore). 43 class AlsaSoundSystem : public SoundSystemInterface { 44 friend class AlsaStream; 45 friend class AlsaInputStream; 46 friend class AlsaOutputStream; 47 public: Create()48 static SoundSystemInterface *Create() { 49 return new AlsaSoundSystem(); 50 } 51 52 AlsaSoundSystem(); 53 54 virtual ~AlsaSoundSystem(); 55 56 virtual bool Init(); 57 virtual void Terminate(); 58 59 virtual bool EnumeratePlaybackDevices(SoundDeviceLocatorList *devices); 60 virtual bool EnumerateCaptureDevices(SoundDeviceLocatorList *devices); 61 62 virtual bool GetDefaultPlaybackDevice(SoundDeviceLocator **device); 63 virtual bool GetDefaultCaptureDevice(SoundDeviceLocator **device); 64 65 virtual SoundOutputStreamInterface *OpenPlaybackDevice( 66 const SoundDeviceLocator *device, 67 const OpenParams ¶ms); 68 virtual SoundInputStreamInterface *OpenCaptureDevice( 69 const SoundDeviceLocator *device, 70 const OpenParams ¶ms); 71 72 virtual const char *GetName() const; 73 74 private: IsInitialized()75 bool IsInitialized() { return initialized_; } 76 77 bool EnumerateDevices(SoundDeviceLocatorList *devices, 78 bool capture_not_playback); 79 80 bool GetDefaultDevice(SoundDeviceLocator **device); 81 82 static size_t FrameSize(const OpenParams ¶ms); 83 84 template <typename StreamInterface> 85 StreamInterface *OpenDevice( 86 const SoundDeviceLocator *device, 87 const OpenParams ¶ms, 88 snd_pcm_stream_t type, 89 StreamInterface *(AlsaSoundSystem::*start_fn)( 90 snd_pcm_t *handle, 91 size_t frame_size, 92 int wait_timeout_ms, 93 int flags, 94 int freq)); 95 96 SoundOutputStreamInterface *StartOutputStream( 97 snd_pcm_t *handle, 98 size_t frame_size, 99 int wait_timeout_ms, 100 int flags, 101 int freq); 102 103 SoundInputStreamInterface *StartInputStream( 104 snd_pcm_t *handle, 105 size_t frame_size, 106 int wait_timeout_ms, 107 int flags, 108 int freq); 109 110 const char *GetError(int err); 111 112 bool initialized_; 113 AlsaSymbolTable symbol_table_; 114 115 DISALLOW_COPY_AND_ASSIGN(AlsaSoundSystem); 116 }; 117 118 } // namespace cricket 119 120 #endif // TALK_SOUND_ALSASOUNDSYSTEM_H_ 121