Mercurial > hg > svcore
comparison base/AudioPlaySource.h @ 0:da6937383da8
initial import
author | Chris Cannam |
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date | Tue, 10 Jan 2006 16:33:16 +0000 |
parents | |
children | d86891498eef |
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1 /* -*- c-basic-offset: 4 -*- vi:set ts=8 sts=4 sw=4: */ | |
2 | |
3 /* | |
4 A waveform viewer and audio annotation editor. | |
5 Chris Cannam, Queen Mary University of London, 2005 | |
6 | |
7 This is experimental software. Not for distribution. | |
8 */ | |
9 | |
10 #ifndef _AUDIO_PLAY_SOURCE_H_ | |
11 #define _AUDIO_PLAY_SOURCE_H_ | |
12 | |
13 /** | |
14 * Simple interface for audio playback. This should be all that the | |
15 * ViewManager needs to know about to synchronise with playback by | |
16 * sample frame, but it doesn't provide enough to determine what is | |
17 * actually being played or how. See the audioio directory for a | |
18 * concrete subclass. | |
19 */ | |
20 | |
21 class AudioPlaySource | |
22 { | |
23 public: | |
24 /** | |
25 * Start playing from the given frame. If playback is already | |
26 * under way, reseek to the given frame and continue. | |
27 */ | |
28 virtual void play(size_t startFrame) = 0; | |
29 | |
30 /** | |
31 * Stop playback. | |
32 */ | |
33 virtual void stop() = 0; | |
34 | |
35 /** | |
36 * Return whether playback is currently supposed to be happening. | |
37 */ | |
38 virtual bool isPlaying() const = 0; | |
39 | |
40 /** | |
41 * Return the frame number that is currently expected to be coming | |
42 * out of the speakers. (i.e. compensating for playback latency.) | |
43 */ | |
44 virtual size_t getCurrentPlayingFrame() = 0; | |
45 | |
46 /** | |
47 * Return the current (or thereabouts) output levels in the range | |
48 * 0.0 -> 1.0, for metering purposes. | |
49 */ | |
50 virtual bool getOutputLevels(float &left, float &right) = 0; | |
51 }; | |
52 | |
53 #endif |