dplug.host.host source code

1 /**
2 Generic host commands.
3 Copyright: Auburn Sounds 2015-2016.
4 License:   $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
5 */
6 module dplug.host.host;
7 
8 nothrow @nogc:
9 
10 interface IPluginHost
11 {
12 nothrow @nogc:
13 
14     /// Process some audio.
15     /// `setSampleRate` and `setMaxBufferSize` must be called before use.
16     /// samples must <= the maximum buffer size asked in 
17     void processAudioFloat(float** inputs, float** ouputs, int samples);
18 
19     /// Sets the desired sampleRate
20     void setSampleRate(float sampleRate);
21 
22     /// Sets the maximum buffer size
23     void setMaxBufferSize(int samples);
24 
25     /// Sets I/O arrangement (simple right now).
26     bool setIO(int numInputs, int numOutputs);
27 
28     /// Sets a parameter's value.
29     void setParameter(int paramIndex, float normalizedValue);
30 
31     /// Returns: Normalized value for parameter.
32     float getParameter(int paramIndex);
33 
34     /// Returns: Full name for parameter.
35     /// Lifetime of return value is same as IPluginHost.
36     const(char)[] getParameterName(int paramIndex);
37 
38     /// Returns: Number of parameters.
39     int getParameterCount();
40 
41     /// Loads a preset.
42     void loadPreset(int presetIndex);
43 
44     /// Serialize state of the plugin, to restore with `restoreState`.
45     ///
46     /// Returns: `null` in case of error, else a state chunk.
47     ///           The lifetime of this returned chunk is the same as the `IPluginHost`, or until 
48     ///           another call to `saveState` is done.
49     const(ubyte)[] saveState();
50 
51     /// Restore state of the plugin, saved with `saveState`.
52     /// Returns: `true` on success.
53     bool restoreState(const(ubyte)[] chunk);
54 
55     /// Gets current "program" index.
56     /// Note: not all presets are exposed to the host. In many plug-ins they aren't.
57     int getCurrentProgram();
58 
59     /// Get plugin information.
60     /// Lifetime of return value is same as IPluginHost.
61     const(char)[] getProductString();
62     
63     ///ditto
64     /// Lifetime of return value is same as IPluginHost.
65     const(char)[] getEffectName();
66     
67     ///ditto
68     /// Lifetime of return value is same as IPluginHost.
69     const(char)[] getVendorString();
70 
71     /// Opens the editor window.
72     /// On Windows, pass a HWND
73     /// On Mac, a NSView    
74     void openUI(void* windowHandle);
75 
76     /// Closes the editor.
77     void closeUI();
78 
79     /// Gets the UI size.
80     int[2] getUISize();
81 
82     /// Switch on the plugin. Call it before processing.
83     void beginAudioProcessing();
84 
85     /// Switch off the plugin. Call it after processing.
86     void endAudioProcessing();
87 
88     /// Get current plug-in latency in samples.
89     /// Because of VST2 limitations, this number of only valid between a 
90     /// `beginAudioProcessing` and `endAudioProcessing` call, and won't move while
91     /// processing.
92     int getLatencySamples();
93 
94     /// Get tail size in seconds. Precise semantics TBD.
95     double getTailSizeInSeconds();
96 }
97 
98