annotate capnproto/vamp.capnp @ 66:6f160dee1192

Instead of using separate values and b64values entries in JSON serialisations, allow numeric arrays to be replaced by b64 variants wherever they appear (discriminating by type). Also rename values to featureValues in feature throughout, as values turns out to be a hazardous name in a JS context. Finally use Array instead of Text for array encoding (seems clearer).

@0xc4b1c6c44c999206;

using Cxx = import "/capnp/c++.capnp";
$Cxx.namespace("vampipe");

enum InputDomain {
    timeDomain         @0;
    frequencyDomain    @1;
}

enum SampleType {
    oneSamplePerStep   @0;
    fixedSampleRate    @1;
    variableSampleRate @2;
}

enum AdapterFlag {
    adaptInputDomain   @0;
    adaptChannelCount  @1;
    adaptBufferSize    @2;
}

const adaptAllSafe :List(AdapterFlag) =
      [ adaptInputDomain, adaptChannelCount ];

const adaptAll :List(AdapterFlag) =
      [ adaptInputDomain, adaptChannelCount, adaptBufferSize ];

struct RealTime {
    sec                @0  :Int32       = 0;
    nsec               @1  :Int32       = 0;
}

struct Basic {
    identifier         @0  :Text;
    name               @1  :Text;
    description        @2  :Text;
}

struct ParameterDescriptor {
    basic              @0  :Basic;
    unit               @1  :Text;
    minValue           @2  :Float32     = 0.0;
    maxValue           @3  :Float32     = 0.0;
    defaultValue       @4  :Float32     = 0.0;
    isQuantized        @5  :Bool        = false;
    quantizeStep       @6  :Float32     = 0.0;
    valueNames         @7  :List(Text)  = [];
}

struct ConfiguredOutputDescriptor {
    unit               @0  :Text;
    hasFixedBinCount   @1  :Bool        = false;
    binCount           @2  :Int32       = 0;
    binNames           @3  :List(Text)  = [];
    hasKnownExtents    @4  :Bool        = false;
    minValue           @5  :Float32     = 0.0;
    maxValue           @6  :Float32     = 0.0;
    isQuantized        @7  :Bool        = false;
    quantizeStep       @8  :Float32     = 0.0;
    sampleType         @9  :SampleType;
    sampleRate         @10 :Float32     = 0.0;
    hasDuration        @11 :Bool        = false;
}

struct OutputDescriptor {
    basic              @0  :Basic;
    configured         @1  :ConfiguredOutputDescriptor;
}

struct PluginStaticData {
    pluginKey          @0  :Text;
    basic              @1  :Basic;
    maker              @2  :Text;
    copyright          @3  :Text;
    pluginVersion      @4  :Int32;
    category           @5  :List(Text);
    minChannelCount    @6  :Int32;
    maxChannelCount    @7  :Int32;
    parameters         @8  :List(ParameterDescriptor);
    programs           @9  :List(Text);
    inputDomain        @10 :InputDomain;
    basicOutputInfo    @11 :List(Basic);
}

struct ProcessInput {
    inputBuffers       @0  :List(List(Float32));
    timestamp          @1  :RealTime;
}

struct Feature {
    hasTimestamp       @0  :Bool        = false;
    timestamp          @1  :RealTime;
    hasDuration        @2  :Bool        = false;
    duration           @3  :RealTime;
    label              @4  :Text;
    featureValues      @5  :List(Float32) = [];
}

struct FeatureSet {
    struct FSPair {
        output         @0  :Text;
        features       @1  :List(Feature) = [];
    }
    featurePairs       @0  :List(FSPair);
}

struct PluginConfiguration {
    struct PVPair {
        parameter      @0  :Text;
        value          @1  :Float32;
    }
    parameterValues    @0  :List(PVPair);
    currentProgram     @1  :Text;
    channelCount       @2  :Int32;
    stepSize           @3  :Int32;
    blockSize          @4  :Int32;
}

struct ListResponse {
    plugins            @0  :List(PluginStaticData);    
}

struct LoadRequest {
    pluginKey          @0  :Text;
    inputSampleRate    @1  :Float32;
    adapterFlags       @2  :List(AdapterFlag);
}

struct LoadResponse {
    pluginHandle       @0  :Int32;
    staticData         @1  :PluginStaticData;
    defaultConfiguration @2  :PluginConfiguration;
}

struct ConfigurationRequest {
    pluginHandle       @0  :Int32;
    configuration      @1  :PluginConfiguration;
}

struct ConfigurationResponse {
    pluginHandle       @0  :Int32;
    outputs            @1  :List(OutputDescriptor);
}

struct ProcessRequest {
    pluginHandle       @0  :Int32;
    processInput       @1  :ProcessInput;
}

struct ProcessResponse {
    pluginHandle       @0  :Int32;
    features           @1  :FeatureSet;
}

struct FinishRequest {
    pluginHandle       @0  :Int32;
}

struct VampRequest {
    request :union {
	list           @0  :Void;
	load           @1  :LoadRequest;
	configure      @2  :ConfigurationRequest;
	process        @3  :ProcessRequest;
	finish         @4  :FinishRequest;     # getRemainingFeatures and unload
    }
}

struct VampResponse {
    success            @0  :Bool;
    errorText          @1  :Text = "";
    response :union {
	list           @2  :ListResponse;
	load           @3  :LoadResponse;
	configure      @4  :ConfigurationResponse;
	process        @5  :ProcessResponse;
	finish         @6  :ProcessResponse;
    }
}