Merge pull request #17 from jwetzell/feat/midi-message-create

add midi.message.create processor
2026-04-27 13:25:40 +00:00 · 2025-12-16 20:09:57 -06:00
parent f3aaa86a1c b726745aa2
commit 9b1ca9da96
1 changed files with 374 additions and 0 deletions
--- a/internal/processor/midi-message-create.go
+++ b/internal/processor/midi-message-create.go
@@ -0,0 +1,374 @@
+//go:build cgo
+
+package processor
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"strconv"
+	"text/template"
+
+	"github.com/jwetzell/showbridge-go/internal/config"
+	"gitlab.com/gomidi/midi/v2"
+)
+
+type MIDIMessageCreate struct {
+	config      config.ProcessorConfig
+	ProcessFunc func(ctx context.Context, payload any) (any, error)
+}
+
+func (mmd *MIDIMessageCreate) Process(ctx context.Context, payload any) (any, error) {
+	return mmd.ProcessFunc(ctx, payload)
+}
+
+func (mmd *MIDIMessageCreate) Type() string {
+	return mmd.config.Type
+}
+
+func newMidiNoteOnCreate(config config.ProcessorConfig) (Processor, error) {
+
+	params := config.Params
+
+	channel, ok := params["channel"]
+
+	if !ok {
+		return nil, fmt.Errorf("midi.message.create NoteOn requires a channel parameter")
+	}
+
+	channelString, ok := channel.(string)
+
+	if !ok {
+		return nil, fmt.Errorf("midi.message.create NoteOn channel must be a string")
+	}
+
+	channelTemplate, err := template.New("channel").Parse(channelString)
+
+	if err != nil {
+		return nil, err
+	}
+
+	note, ok := params["note"]
+
+	if !ok {
+		return nil, fmt.Errorf("midi.message.create NoteOn requires a note parameter")
+	}
+
+	noteString, ok := note.(string)
+
+	if !ok {
+		return nil, fmt.Errorf("midi.message.create NoteOn note must be a string")
+	}
+
+	noteTemplate, err := template.New("note").Parse(noteString)
+
+	if err != nil {
+		return nil, err
+	}
+
+	velocity, ok := params["velocity"]
+
+	if !ok {
+		return nil, fmt.Errorf("midi.message.create NoteOn requires a velocity parameter")
+	}
+
+	velocityString, ok := velocity.(string)
+
+	if !ok {
+		return nil, fmt.Errorf("midi.message.create NoteOn velocity must be a string")
+	}
+
+	velocityTemplate, err := template.New("velocity").Parse(velocityString)
+
+	if err != nil {
+		return nil, err
+	}
+
+	return &MIDIMessageCreate{config: config, ProcessFunc: func(ctx context.Context, payload any) (any, error) {
+
+		var channelBuffer bytes.Buffer
+		err := channelTemplate.Execute(&channelBuffer, payload)
+
+		if err != nil {
+			return nil, err
+		}
+
+		channelValue, err := strconv.ParseUint(channelBuffer.String(), 10, 8)
+
+		var noteBuffer bytes.Buffer
+		err = noteTemplate.Execute(&noteBuffer, payload)
+
+		if err != nil {
+			return nil, err
+		}
+
+		noteValue, err := strconv.ParseUint(noteBuffer.String(), 10, 8)
+
+		var velocityBuffer bytes.Buffer
+		err = velocityTemplate.Execute(&velocityBuffer, payload)
+
+		if err != nil {
+			return nil, err
+		}
+
+		velocityValue, err := strconv.ParseUint(velocityBuffer.String(), 10, 8)
+		payloadMessage := midi.NoteOn(uint8(channelValue), uint8(noteValue), uint8(velocityValue))
+		return payloadMessage, nil
+	}}, nil
+}
+
+func newMidiNoteOffCreate(config config.ProcessorConfig) (Processor, error) {
+
+	params := config.Params
+
+	channel, ok := params["channel"]
+
+	if !ok {
+		return nil, fmt.Errorf("midi.message.create NoteOn requires a channel parameter")
+	}
+
+	channelString, ok := channel.(string)
+
+	if !ok {
+		return nil, fmt.Errorf("midi.message.create NoteOn channel must be a string")
+	}
+
+	channelTemplate, err := template.New("channel").Parse(channelString)
+
+	if err != nil {
+		return nil, err
+	}
+
+	note, ok := params["note"]
+
+	if !ok {
+		return nil, fmt.Errorf("midi.message.create NoteOn requires a note parameter")
+	}
+
+	noteString, ok := note.(string)
+
+	if !ok {
+		return nil, fmt.Errorf("midi.message.create NoteOn note must be a string")
+	}
+
+	noteTemplate, err := template.New("note").Parse(noteString)
+
+	if err != nil {
+		return nil, err
+	}
+
+	return &MIDIMessageCreate{config: config, ProcessFunc: func(ctx context.Context, payload any) (any, error) {
+
+		var channelBuffer bytes.Buffer
+		err := channelTemplate.Execute(&channelBuffer, payload)
+
+		if err != nil {
+			return nil, err
+		}
+
+		channelValue, err := strconv.ParseUint(channelBuffer.String(), 10, 8)
+
+		var noteBuffer bytes.Buffer
+		err = noteTemplate.Execute(&noteBuffer, payload)
+
+		if err != nil {
+			return nil, err
+		}
+
+		noteValue, err := strconv.ParseUint(noteBuffer.String(), 10, 8)
+
+		payloadMessage := midi.NoteOff(uint8(channelValue), uint8(noteValue))
+		return payloadMessage, nil
+	}}, nil
+}
+
+func newMidiControlChangeCreate(config config.ProcessorConfig) (Processor, error) {
+
+	params := config.Params
+
+	channel, ok := params["channel"]
+
+	if !ok {
+		return nil, fmt.Errorf("midi.message.create ControlChange requires a channel parameter")
+	}
+
+	channelString, ok := channel.(string)
+
+	if !ok {
+		return nil, fmt.Errorf("midi.message.create ControlChange channel must be a string")
+	}
+
+	channelTemplate, err := template.New("channel").Parse(channelString)
+
+	if err != nil {
+		return nil, err
+	}
+
+	controller, ok := params["controller"]
+
+	if !ok {
+		return nil, fmt.Errorf("midi.message.create ControlChange requires a controller parameter")
+	}
+
+	controllerString, ok := controller.(string)
+
+	if !ok {
+		return nil, fmt.Errorf("midi.message.create ControlChange controller must be a string")
+	}
+
+	controllerTemplate, err := template.New("controller").Parse(controllerString)
+
+	if err != nil {
+		return nil, err
+	}
+
+	value, ok := params["value"]
+
+	if !ok {
+		return nil, fmt.Errorf("midi.message.create ControlChange requires a value parameter")
+	}
+
+	valueString, ok := value.(string)
+
+	if !ok {
+		return nil, fmt.Errorf("midi.message.create ControlChange value must be a string")
+	}
+
+	valueTemplate, err := template.New("value").Parse(valueString)
+
+	if err != nil {
+		return nil, err
+	}
+
+	return &MIDIMessageCreate{config: config, ProcessFunc: func(ctx context.Context, payload any) (any, error) {
+
+		var channelBuffer bytes.Buffer
+		err := channelTemplate.Execute(&channelBuffer, payload)
+
+		if err != nil {
+			return nil, err
+		}
+
+		channelValue, err := strconv.ParseUint(channelBuffer.String(), 10, 8)
+
+		var controllerBuffer bytes.Buffer
+		err = controllerTemplate.Execute(&controllerBuffer, payload)
+
+		if err != nil {
+			return nil, err
+		}
+
+		controllerValue, err := strconv.ParseUint(controllerBuffer.String(), 10, 8)
+
+		var valueBuffer bytes.Buffer
+		err = valueTemplate.Execute(&valueBuffer, payload)
+
+		if err != nil {
+			return nil, err
+		}
+
+		valueValue, err := strconv.ParseUint(valueBuffer.String(), 10, 8)
+
+		payloadMessage := midi.ControlChange(uint8(channelValue), uint8(controllerValue), uint8(valueValue))
+		return payloadMessage, nil
+	}}, nil
+}
+
+func newMidiProgramChangeCreate(config config.ProcessorConfig) (Processor, error) {
+
+	params := config.Params
+
+	channel, ok := params["channel"]
+
+	if !ok {
+		return nil, fmt.Errorf("midi.message.create ProgramChange requires a channel parameter")
+	}
+
+	channelString, ok := channel.(string)
+
+	if !ok {
+		return nil, fmt.Errorf("midi.message.create ProgramChange channel must be a string")
+	}
+
+	channelTemplate, err := template.New("channel").Parse(channelString)
+
+	if err != nil {
+		return nil, err
+	}
+
+	program, ok := params["program"]
+
+	if !ok {
+		return nil, fmt.Errorf("midi.message.create ProgramChange requires a program parameter")
+	}
+
+	programString, ok := program.(string)
+
+	if !ok {
+		return nil, fmt.Errorf("midi.message.create ProgramChange program must be a string")
+	}
+
+	programTemplate, err := template.New("program").Parse(programString)
+
+	if err != nil {
+		return nil, err
+	}
+
+	return &MIDIMessageCreate{config: config, ProcessFunc: func(ctx context.Context, payload any) (any, error) {
+
+		var channelBuffer bytes.Buffer
+		err := channelTemplate.Execute(&channelBuffer, payload)
+
+		if err != nil {
+			return nil, err
+		}
+
+		channelValue, err := strconv.ParseUint(channelBuffer.String(), 10, 8)
+
+		var programBuffer bytes.Buffer
+		err = programTemplate.Execute(&programBuffer, payload)
+
+		if err != nil {
+			return nil, err
+		}
+
+		programValue, err := strconv.ParseUint(programBuffer.String(), 10, 8)
+
+		payloadMessage := midi.ProgramChange(uint8(channelValue), uint8(programValue))
+		return payloadMessage, nil
+	}}, nil
+}
+
+func init() {
+	RegisterProcessor(ProcessorRegistration{
+		Type: "midi.message.create",
+		New: func(config config.ProcessorConfig) (Processor, error) {
+			params := config.Params
+
+			msgType, ok := params["type"]
+
+			if !ok {
+				return nil, fmt.Errorf("midi.message.create requires a type parameter")
+			}
+
+			msgTypeString, ok := msgType.(string)
+
+			if !ok {
+				return nil, fmt.Errorf("midi.message.create type parameter must be a string")
+			}
+
+			switch msgTypeString {
+			case "NoteOn", "noteon", "note_on":
+				return newMidiNoteOnCreate(config)
+			case "NoteOff", "noteoff", "note_off":
+				return newMidiNoteOffCreate(config)
+			case "ControlChange", "controlchange", "control_change":
+				return newMidiControlChangeCreate(config)
+			case "ProgramChange", "programchange", "program_change":
+				return newMidiProgramChangeCreate(config)
+			default:
+				return nil, fmt.Errorf("midi.message.create does not support type %s", msgTypeString)
+			}
+		},
+	})
+}