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88 lines
3.3 KiB
C++
88 lines
3.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla code.
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*
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* The Initial Developer of the Original Code is the Mozilla Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2007
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Chris Double <chris.double@double.co.nz>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nscore.h"
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#include "prlog.h"
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extern PRLogModuleInfo* gAudioStreamLog;
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class nsAudioStream
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{
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public:
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// Initialize Audio Library. Some Audio backends (eg. PortAudio) require initializing
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// library before using it.
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static void InitLibrary();
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// Shutdown Audio Library. Some Audio backends (eg. PortAudio) require shutting down
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// the library after using it.
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static void ShutdownLibrary();
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nsAudioStream();
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// Initialize the audio stream. aNumChannels is the number of audio channels
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// (1 for mono, 2 for stereo, etc) and aRate is the frequency of the sound
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// samples (22050, 44100, etc).
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void Init(PRInt32 aNumChannels, PRInt32 aRate);
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// Closes the stream. All future use of the stream is an error.
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void Shutdown();
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// Write sound data to the audio hardware. aBuf is an array of floats of
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// length aCount. aCount should be evenly divisible by the number of
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// channels in this audio stream.
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void Write(float* aBuf, PRUint32 count);
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// Return the number of sound samples that can be written to the audio device
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// without blocking.
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PRInt32 Available();
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// Store in aVolume the value of the volume setting. This is a value from
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// 0 (meaning muted) to 1 (meaning full volume).
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float GetVolume();
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// Set the current volume of the audio playback. This is a value from
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// 0 (meaning muted) to 1 (meaning full volume).
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void SetVolume(float aVolume);
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private:
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double mVolume;
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void* mAudioHandle;
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int mRate;
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int mChannels;
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PRPackedBool mMute;
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};
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