28e2075280
trunk/talk git-svn-id: http://webrtc.googlecode.com/svn/trunk@4318 4adac7df-926f-26a2-2b94-8c16560cd09d
86 lines
3.5 KiB
C++
86 lines
3.5 KiB
C++
/*
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* libjingle
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* Copyright 2004--2010, Google Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TALK_SOUND_SOUNDINPUTSTREAMINTERFACE_H_
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#define TALK_SOUND_SOUNDINPUTSTREAMINTERFACE_H_
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#include "talk/base/constructormagic.h"
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#include "talk/base/sigslot.h"
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namespace cricket {
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// Interface for consuming an input stream from a recording device.
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// Semantics and thread-safety of StartReading()/StopReading() are the same as
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// for talk_base::Worker.
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class SoundInputStreamInterface {
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public:
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virtual ~SoundInputStreamInterface() {}
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// Starts the reading of samples on the current thread.
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virtual bool StartReading() = 0;
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// Stops the reading of samples.
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virtual bool StopReading() = 0;
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// Retrieves the current input volume for this stream. Nominal range is
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// defined by SoundSystemInterface::k(Max|Min)Volume, but values exceeding the
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// max may be possible in some implementations. This call retrieves the actual
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// volume currently in use by the OS, not a cached value from a previous
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// (Get|Set)Volume() call.
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virtual bool GetVolume(int *volume) = 0;
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// Changes the input volume for this stream. Nominal range is defined by
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// SoundSystemInterface::k(Max|Min)Volume. The effect of exceeding kMaxVolume
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// is implementation-defined.
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virtual bool SetVolume(int volume) = 0;
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// Closes this stream object. If currently reading then this may only be
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// called from the reading thread.
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virtual bool Close() = 0;
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// Get the latency of the stream.
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virtual int LatencyUsecs() = 0;
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// Notifies the consumer of new data read from the device.
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// The first parameter is a pointer to the data read, and is only valid for
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// the duration of the call.
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// The second parameter is the amount of data read in bytes (i.e., the valid
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// length of the memory pointed to).
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// The 3rd parameter is the stream that is issuing the callback.
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sigslot::signal3<const void *, size_t,
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SoundInputStreamInterface *> SignalSamplesRead;
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protected:
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SoundInputStreamInterface() {}
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private:
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DISALLOW_COPY_AND_ASSIGN(SoundInputStreamInterface);
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};
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} // namespace cricket
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#endif // TALK_SOUND_SOUNDOUTPUTSTREAMINTERFACE_H_
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