root/OpenSceneGraph/trunk/include/osg/AudioStream @ 10961

Revision 10961, 2.7 kB (checked in by robert, 5 years ago)

From Serge Lages, "Here is a patch to allow setting an audio volume with the AudioSink? interface, I've also modified the ffmpeg plugin code to implement the ImageStream?'s setVolume method with its AudioSink?."

RevLine 
[9827]1/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
2 *
3 * This library is open source and may be redistributed and/or modified under 
4 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
5 * (at your option) any later version.  The full license is in LICENSE file
6 * included with this distribution, and on the openscenegraph.org website.
7 *
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * OpenSceneGraph Public License for more details.
12*/
13
14#ifndef OSG_AUDIOSTREAM
15#define OSG_AUDIOSTREAM 1
16
17#include <osg/Image>
[10764]18#include <stdlib.h>
[9827]19
20namespace osg {
21
[9847]22/** Pure virtual AudioSink bass class that is used to connect the audio system with AudioStreams. */
23class OSG_EXPORT AudioSink : public osg::Object
[9827]24{
25public:
26
[9847]27    AudioSink();
[9827]28
[10925]29    virtual const char * libraryName() const { return "osg"; }
30    virtual const char * className() const { return "AudioSinkInterface"; }
31
32    virtual void play() = 0;
33    virtual void pause()  = 0;
34    virtual void stop()  = 0;
35
[9827]36    virtual bool playing() const = 0;
37
38    virtual double getDelay() const { return _delay; }
39    virtual void setDelay(const double delay) { _delay = delay; }
40
[10961]41    virtual void setVolume(float) {}
42    virtual float getVolume() const { return 0.0f; }
[9827]43
44private:
45
[9847]46    virtual AudioSink * cloneType() const { return 0; }
47    virtual AudioSink * clone(const osg::CopyOp &) const { return 0; }
[9827]48
49    double  _delay;
50};
51
52/** Pure virtual AudioStream base class. Subclasses provide mechanism for reading/generating audio data*/
53class OSG_EXPORT AudioStream : public osg::Object
54{
55    public:
56        AudioStream();
57
58        /** Copy constructor using CopyOp to manage deep vs shallow copy. */
59        AudioStream(const AudioStream& audio,const CopyOp& copyop=CopyOp::SHALLOW_COPY);
60
61        virtual bool isSameKindAs(const Object* obj) const { return dynamic_cast<const AudioStream*>(obj)!=0; }
62        virtual const char* libraryName() const { return "osg"; }
63        virtual const char* className() const { return "AudioStream"; }
64
[9847]65        virtual void setAudioSink(osg::AudioSink* audio_sink) = 0;
[9827]66       
67        virtual void consumeAudioBuffer(void * const buffer, const size_t size) = 0;
68       
69        virtual int audioFrequency() const = 0;
70        virtual int audioNbChannels() const = 0;
71
72        enum SampleFormat
73        {
74            SAMPLE_FORMAT_U8,
75            SAMPLE_FORMAT_S16,
76            SAMPLE_FORMAT_S24,
77            SAMPLE_FORMAT_S32,
78            SAMPLE_FORMAT_F32
79        };
80
81        virtual SampleFormat audioSampleFormat() const = 0;
82};
83
84} // namespace
85
86#endif
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