69 lines
1.6 KiB
Go
69 lines
1.6 KiB
Go
package alsa_wrapper
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/*
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#ifndef ARREMI
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#define ARREMI
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#cgo LDFLAGS: -lasound
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#include <stdlib.h>
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#include "alsa_wrapper.h"
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#endif
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*/
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import "C"
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import (
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"fmt"
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"unsafe"
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)
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// NewClient to register new ALSA client.
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func NewClient(name string) error {
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cDevName := C.CString(name)
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defer C.free(unsafe.Pointer(cDevName))
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var status = int(C.new_client(cDevName))
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if status != 0 {
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stage, errCode := resolveErrCode(status)
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switch stage {
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case 1:
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return fmt.Errorf("Error while opening sequencer. %d", errCode)
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case 2:
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return fmt.Errorf("Error while getting sequencer id. %d", errCode)
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case 3:
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return fmt.Errorf("Error while setting sequencer name. %d", errCode)
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}
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}
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return nil
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}
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// NewPort to reigister new MIDI port.
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func NewPort(name string) error {
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cPortName := C.CString(name)
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defer C.free(unsafe.Pointer(cPortName))
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var status = int(C.new_port(cPortName))
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if status != 0 {
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return fmt.Errorf("Error while createing sequencer port. %d", status)
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}
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return nil
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}
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// SendData to ALSA
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func SendData(p []byte) error {
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cData := (*C.char)(unsafe.Pointer(&p[0]))
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defer C.free(unsafe.Pointer(cData))
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var status = int(C.send_data(cData, C.int(len(p))))
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if status != 0 {
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stage, errCode := resolveErrCode(status)
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switch stage {
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case 1:
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return fmt.Errorf("Error while creating MIDI event. %d", errCode)
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case 2:
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return fmt.Errorf("Error while encoding MIDI event. %d", errCode)
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case 3:
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return fmt.Errorf("Error while sending data. %d", errCode)
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}
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}
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return nil
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}
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func resolveErrCode(code int) (int, int) {
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return code >> 16, code & 0xffff
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}
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