port to linux, stage 1
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backend/alsa_wrapper/alsa_wrapper.c
Normal file
64
backend/alsa_wrapper/alsa_wrapper.c
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@ -0,0 +1,64 @@
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#include <alsa/asoundlib.h>
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#include "alsa_wrapper.h"
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int new_client(char* client_name) {
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int status;
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status = snd_seq_open(&seq_handle, "hw", SND_SEQ_OPEN_OUTPUT, 0);
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if (status < 0) {
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return 1<<16|status;
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}
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seq_client = snd_seq_client_id(seq_handle);
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if (seq_client < 0) {
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return 2<<16|status;
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}
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status = snd_seq_client_name(seq_handle, client_name);
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if (status < 0) {
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return 3<<16|status;
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}
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// Success
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return 0;
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}
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int new_port(char* port_name) {
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seq_port = snd_seq_create_simple_port(seq_handle, portname,
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SND_SEQ_PORT_CAP_READ|SND_SEQ_PORT_CAP_SUBS_READ,
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SND_SEQ_PORT_TYPE_MIDI_GENERIC|SND_SEQ_PORT_TYPE_APPLICATION);
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if (seq_port < 0) {
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return seq_port;
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}
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// Success
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return 0;
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}
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int send_data(char* data, int length) {
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int status;
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snd_midi_event_t* midiParser;
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status = snd_midi_event_new(length, &midiParser);
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if (status < 0) {
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return 1<<16|status;
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}
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snd_seq_event_t* ev;
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snd_seq_ev_clear(ev);
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status = snd_midi_event_encode(midiParser, data, length, ev);
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if (status < 0) {
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return 2<<16|status;
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}
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snd_seq_ev_set_direct(ev);
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snd_seq_ev_set_source(ev, seq_port);
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snd_seq_ev_set_dest(ev, SND_SEQ_ADDRESS_SUBSCRIBERS, 0);
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status = snd_seq_event_output_direct(seq_handle, ev);
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if (status < 0) {
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return 3<<16|status;
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}
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return 0;
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}
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12
backend/alsa_wrapper/alsa_wrapper.h
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12
backend/alsa_wrapper/alsa_wrapper.h
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@ -0,0 +1,12 @@
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#ifndef ARREMI_ALSA_WRAPPER_H
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#define ARREMI_ALSA_WRAPPER_H
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#include <alsa/asoundlib.h>
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static snd_seq_t *seq_handle;
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int seq_client, seq_port;
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int new_client(char*);
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int new_port(char*);
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int send_data(char*, int);
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#endif
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@ -9,7 +9,7 @@ import (
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type MIDIDevice struct {
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client midi.Client
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source midi.Source
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Signal chan midi.Packet
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Signal chan int
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}
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// NewMIDIDevice construction func
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@ -23,7 +23,7 @@ func NewMIDIDevice() (*MIDIDevice, error) {
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func (midiDev *MIDIDevice) Init() error {
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var err error
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midiDev.Signal = make(chan midi.Packet, 4096)
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midiDev.Signal = make(chan int, 4096)
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midiDev.client, err = midi.NewClient(consts.ClientName)
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if err != nil {
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return err
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@ -35,7 +35,7 @@ func (midiDev *MIDIDevice) Init() error {
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func (midiDev *MIDIDevice) Write(p []byte) (int, error) {
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var pack = midi.NewPacket(p, 0)
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midiDev.Signal <- pack
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midiDev.Signal <- 1
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err := pack.Received(&(midiDev.source))
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return len(p), err
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}
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@ -1,15 +1,25 @@
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package backend
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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 "alsa_wrapper/alsa_wrapper.h"
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#endif
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*/
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import (
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"C"
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"unsafe"
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)
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import (
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"fmt"
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"github.com/tonychee7000/Arremi/consts"
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midi "github.com/youpy/go-coremidi"
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)
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// MIDIDevice implies a Writer interface.
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type MIDIDevice struct {
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client midi.Client
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source midi.Source
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Signal chan midi.Packet
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Signal chan int
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}
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// NewMIDIDevice construction func
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@ -21,23 +31,52 @@ func NewMIDIDevice() (*MIDIDevice, error) {
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// Init the client and source
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func (midiDev *MIDIDevice) Init() error {
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var err error
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var status int
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midiDev.Signal = make(chan midi.Packet, 4096)
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midiDev.client, err = midi.NewClient(consts.ClientName)
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if err != nil {
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return err
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midiDev.Signal = make(chan int, 4096)
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cDevName := C.CString(consts.ClientName)
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defer C.free(unsafe.Pointer(cDevName))
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status = 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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midiDev.source, err = midi.NewSource(midiDev.client, consts.SourceName)
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return err
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cPortName := C.CString(consts.SourceName)
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defer C.free(unsafe.Pointer(cPortName))
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status = 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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func (midiDev *MIDIDevice) Write(p []byte) (int, error) {
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var pack = midi.NewPacket(p, 0)
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midiDev.Signal <- pack
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err := pack.Received(&(midiDev.source))
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return len(p), err
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midiDev.Signal <- 1
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cData := (*C.CChar)(unsafe.Pointer(&p[0]))
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defer C.free(unsafe.Pointer(cData))
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var status = 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 0, fmt.Errorf("Error while creating MIDI event. %d", errCode)
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case 2:
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return 0, fmt.Errorf("Error while encoding MIDI event. %d", errCode)
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case 3:
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return 0, fmt.Errorf("Error while sending data. %d", errCode)
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}
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}
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return len(p), nil
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}
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// AllNoteOff I don't want panic!
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@ -48,3 +87,7 @@ func (midiDev *MIDIDevice) AllNoteOff() {
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}
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}
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}
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func resolveErrCode(int code) (int, int) {
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return code >> 16, code & 0xffff
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}
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