971 lines
25 KiB
C
971 lines
25 KiB
C
/*
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* ALSA SEQ < - > JACK MIDI bridge
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*
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* Copyright (c) 2006,2007 Dmitry S. Baikov <c0ff@konstruktiv.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* alsa_seqmidi_read:
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* add new ports
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* reads queued snd_seq_event's
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* if PORT_EXIT: mark port as dead
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* if PORT_ADD, PORT_CHANGE: send addr to port_thread (it also may mark port as dead)
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* else process input event
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* remove dead ports and send them to port_thread
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*
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* alsa_seqmidi_write:
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* remove dead ports and send them to port_thread
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* add new ports
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* queue output events
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*
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* port_thread:
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* wait for port_sem
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* free deleted ports
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* create new ports or mark existing as dead
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*/
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#include <alsa/asoundlib.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <signal.h>
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#include <semaphore.h>
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#include <pthread.h>
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#include <time.h>
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#include <ctype.h>
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#include <limits.h>
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#include "midiport.h"
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#include "ringbuffer.h"
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#include "alsa_midi_impl.h"
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#include "JackError.h"
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#define NSEC_PER_SEC ((int64_t)1000*1000*1000)
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enum {
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MAX_PORTS = 64,
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MAX_EVENT_SIZE = 1024,
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};
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typedef struct port_t port_t;
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enum {
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PORT_HASH_BITS = 4,
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PORT_HASH_SIZE = 1 << PORT_HASH_BITS
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};
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typedef port_t* port_hash_t[PORT_HASH_SIZE];
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struct port_t {
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port_t *next;
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int is_dead;
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char name[64];
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snd_seq_addr_t remote;
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jack_port_t *jack_port;
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jack_ringbuffer_t *early_events; // alsa_midi_event_t + data
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int64_t last_out_time;
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void *jack_buf;
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};
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typedef struct {
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snd_midi_event_t *codec;
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jack_ringbuffer_t *new_ports;
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port_t *ports[MAX_PORTS];
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} stream_t;
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typedef struct alsa_seqmidi {
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alsa_midi_t ops;
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jack_client_t *jack;
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snd_seq_t *seq;
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snd_seq_queue_timer_t* timer;
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int client_id;
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int port_id;
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int queue;
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int keep_walking;
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pthread_t port_thread;
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sem_t port_sem;
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jack_ringbuffer_t *port_add; // snd_seq_addr_t
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jack_ringbuffer_t *port_del; // port_t*
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stream_t stream[2];
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char alsa_name[32];
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int midi_in_cnt;
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int midi_out_cnt;
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} alsa_seqmidi_t;
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struct alsa_midi_event {
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int64_t time;
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int size;
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};
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typedef struct alsa_midi_event alsa_midi_event_t;
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struct process_info {
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int dir;
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jack_nframes_t nframes;
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jack_nframes_t period_start;
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jack_nframes_t sample_rate;
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jack_nframes_t cur_frames;
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int64_t alsa_time;
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};
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enum PortType { PORT_INPUT = 0, PORT_OUTPUT = 1 };
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typedef void (*port_jack_func)(alsa_seqmidi_t *self, port_t *port,struct process_info* info);
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static void do_jack_input(alsa_seqmidi_t *self, port_t *port, struct process_info* info);
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static void do_jack_output(alsa_seqmidi_t *self, port_t *port, struct process_info* info);
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typedef struct {
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int alsa_mask;
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int jack_caps;
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char name[9];
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port_jack_func jack_func;
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} port_type_t;
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static port_type_t port_type[2] = {
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{
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SND_SEQ_PORT_CAP_SUBS_READ,
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JackPortIsOutput,
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"capture",
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do_jack_input
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},
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{
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SND_SEQ_PORT_CAP_SUBS_WRITE,
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JackPortIsInput,
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"playback",
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do_jack_output
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}
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};
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static void alsa_seqmidi_delete(alsa_midi_t *m);
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static int alsa_seqmidi_attach(alsa_midi_t *m);
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static int alsa_seqmidi_detach(alsa_midi_t *m);
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static int alsa_seqmidi_start(alsa_midi_t *m);
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static int alsa_seqmidi_stop(alsa_midi_t *m);
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static void alsa_seqmidi_read(alsa_midi_t *m, jack_nframes_t nframes);
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static void alsa_seqmidi_write(alsa_midi_t *m, jack_nframes_t nframes);
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static
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void stream_init(alsa_seqmidi_t *self, int dir)
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{
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stream_t *str = &self->stream[dir];
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str->new_ports = jack_ringbuffer_create(MAX_PORTS*sizeof(port_t*));
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snd_midi_event_new(MAX_EVENT_SIZE, &str->codec);
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}
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static void port_free(alsa_seqmidi_t *self, port_t *port);
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static void free_ports(alsa_seqmidi_t *self, jack_ringbuffer_t *ports);
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static
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void stream_attach(alsa_seqmidi_t *self, int dir)
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{
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}
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static
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void stream_detach(alsa_seqmidi_t *self, int dir)
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{
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stream_t *str = &self->stream[dir];
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int i;
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free_ports(self, str->new_ports);
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// delete all ports from hash
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for (i=0; i<PORT_HASH_SIZE; ++i) {
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port_t *port = str->ports[i];
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while (port) {
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port_t *next = port->next;
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port_free(self, port);
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port = next;
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}
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str->ports[i] = NULL;
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}
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}
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static
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void stream_close(alsa_seqmidi_t *self, int dir)
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{
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stream_t *str = &self->stream[dir];
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if (str->codec)
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snd_midi_event_free(str->codec);
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if (str->new_ports)
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jack_ringbuffer_free(str->new_ports);
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}
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alsa_midi_t* alsa_seqmidi_new(jack_client_t *client, const char* alsa_name)
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{
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alsa_seqmidi_t *self = calloc(1, sizeof(alsa_seqmidi_t));
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debug_log("midi: new");
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if (!self)
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return NULL;
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self->jack = client;
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if (!alsa_name)
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alsa_name = "jack_midi";
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snprintf(self->alsa_name, sizeof(self->alsa_name), "%s", alsa_name);
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self->port_add = jack_ringbuffer_create(2*MAX_PORTS*sizeof(snd_seq_addr_t));
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self->port_del = jack_ringbuffer_create(2*MAX_PORTS*sizeof(port_t*));
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sem_init(&self->port_sem, 0, 0);
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stream_init(self, PORT_INPUT);
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stream_init(self, PORT_OUTPUT);
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self->midi_in_cnt = 0;
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self->midi_out_cnt = 0;
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self->ops.destroy = alsa_seqmidi_delete;
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self->ops.attach = alsa_seqmidi_attach;
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self->ops.detach = alsa_seqmidi_detach;
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self->ops.start = alsa_seqmidi_start;
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self->ops.stop = alsa_seqmidi_stop;
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self->ops.read = alsa_seqmidi_read;
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self->ops.write = alsa_seqmidi_write;
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return &self->ops;
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}
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static
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void alsa_seqmidi_delete(alsa_midi_t *m)
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{
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alsa_seqmidi_t *self = (alsa_seqmidi_t*) m;
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debug_log("midi: delete");
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alsa_seqmidi_detach(m);
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stream_close(self, PORT_OUTPUT);
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stream_close(self, PORT_INPUT);
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jack_ringbuffer_free(self->port_add);
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jack_ringbuffer_free(self->port_del);
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sem_close(&self->port_sem);
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free(self);
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}
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static
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int alsa_seqmidi_attach(alsa_midi_t *m)
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{
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alsa_seqmidi_t *self = (alsa_seqmidi_t*) m;
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int err;
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debug_log("midi: attach");
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if (self->seq)
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return -EALREADY;
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if ((err = snd_seq_open(&self->seq, "hw", SND_SEQ_OPEN_DUPLEX, 0)) < 0) {
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error_log("failed to open alsa seq");
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return err;
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}
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if ((err = snd_seq_queue_timer_malloc(&self->timer)) < 0) {
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error_log("failed to allocate timer");
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return err;
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}
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snd_seq_set_client_name(self->seq, self->alsa_name);
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self->port_id = snd_seq_create_simple_port(self->seq, "port",
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SND_SEQ_PORT_CAP_READ|SND_SEQ_PORT_CAP_WRITE
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#ifndef JACK_MIDI_DEBUG
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|SND_SEQ_PORT_CAP_NO_EXPORT
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#endif
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,SND_SEQ_PORT_TYPE_APPLICATION);
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self->client_id = snd_seq_client_id(self->seq);
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self->queue = snd_seq_alloc_queue(self->seq);
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// set high resolution
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if (snd_seq_get_queue_timer(self->seq, self->queue, self->timer) == 0) {
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snd_seq_queue_timer_set_resolution(self->timer, UINT_MAX);
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snd_seq_set_queue_timer(self->seq, self->queue, self->timer);
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} else {
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error_log("failed to set alsa timer in high resolution");
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}
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snd_seq_start_queue(self->seq, self->queue, 0);
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stream_attach(self, PORT_INPUT);
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stream_attach(self, PORT_OUTPUT);
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snd_seq_nonblock(self->seq, 1);
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return 0;
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}
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static
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int alsa_seqmidi_detach(alsa_midi_t *m)
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{
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alsa_seqmidi_t *self = (alsa_seqmidi_t*) m;
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debug_log("midi: detach");
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if (!self->seq)
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return -EALREADY;
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alsa_seqmidi_stop(m);
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jack_ringbuffer_reset(self->port_add);
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free_ports(self, self->port_del);
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stream_detach(self, PORT_INPUT);
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stream_detach(self, PORT_OUTPUT);
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snd_seq_queue_timer_free(self->timer);
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snd_seq_close(self->seq);
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self->seq = NULL;
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return 0;
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}
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static void* port_thread(void *);
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static void add_existing_ports(alsa_seqmidi_t *self);
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static void update_ports(alsa_seqmidi_t *self);
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static void add_ports(stream_t *str);
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static
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int alsa_seqmidi_start(alsa_midi_t *m)
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{
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alsa_seqmidi_t *self = (alsa_seqmidi_t*) m;
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int err;
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debug_log("midi: start");
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if (!self->seq)
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return -EBADF;
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if (self->keep_walking)
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return -EALREADY;
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snd_seq_connect_from(self->seq, self->port_id, SND_SEQ_CLIENT_SYSTEM, SND_SEQ_PORT_SYSTEM_ANNOUNCE);
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snd_seq_drop_input(self->seq);
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add_existing_ports(self);
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update_ports(self);
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add_ports(&self->stream[PORT_INPUT]);
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add_ports(&self->stream[PORT_OUTPUT]);
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self->keep_walking = 1;
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if ((err = pthread_create(&self->port_thread, NULL, port_thread, self))) {
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self->keep_walking = 0;
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return -errno;
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}
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return 0;
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}
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static
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int alsa_seqmidi_stop(alsa_midi_t *m)
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{
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alsa_seqmidi_t *self = (alsa_seqmidi_t*) m;
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debug_log("midi: stop");
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if (!self->keep_walking)
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return -EALREADY;
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snd_seq_disconnect_from(self->seq, self->port_id, SND_SEQ_CLIENT_SYSTEM, SND_SEQ_PORT_SYSTEM_ANNOUNCE);
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self->keep_walking = 0;
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sem_post(&self->port_sem);
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pthread_join(self->port_thread, NULL);
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self->port_thread = 0;
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return 0;
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}
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static
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int alsa_connect_from(alsa_seqmidi_t *self, int client, int port)
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{
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snd_seq_port_subscribe_t* sub;
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snd_seq_addr_t seq_addr;
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int err;
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snd_seq_port_subscribe_alloca(&sub);
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seq_addr.client = client;
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seq_addr.port = port;
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snd_seq_port_subscribe_set_sender(sub, &seq_addr);
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seq_addr.client = self->client_id;
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seq_addr.port = self->port_id;
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snd_seq_port_subscribe_set_dest(sub, &seq_addr);
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snd_seq_port_subscribe_set_time_update(sub, 1);
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snd_seq_port_subscribe_set_queue(sub, self->queue);
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snd_seq_port_subscribe_set_time_real(sub, 1);
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if ((err=snd_seq_subscribe_port(self->seq, sub)))
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error_log("can't subscribe to %d:%d - %s", client, port, snd_strerror(err));
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return err;
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}
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/*
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* ==================== Port routines =============================
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*/
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static inline
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int port_hash(snd_seq_addr_t addr)
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{
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return (addr.client + addr.port) % PORT_HASH_SIZE;
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}
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static
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port_t* port_get(port_hash_t hash, snd_seq_addr_t addr)
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{
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port_t **pport = &hash[port_hash(addr)];
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while (*pport) {
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port_t *port = *pport;
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if (port->remote.client == addr.client && port->remote.port == addr.port)
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return port;
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pport = &port->next;
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}
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return NULL;
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}
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static
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void port_insert(port_hash_t hash, port_t *port)
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{
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port_t **pport = &hash[port_hash(port->remote)];
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port->next = *pport;
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*pport = port;
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}
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static
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void port_setdead(port_hash_t hash, snd_seq_addr_t addr)
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{
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port_t *port = port_get(hash, addr);
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if (port)
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port->is_dead = 1; // see jack_process
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else {
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debug_log("port_setdead: not found (%d:%d)", addr.client, addr.port);
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}
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}
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static
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void port_free(alsa_seqmidi_t *self, port_t *port)
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{
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//snd_seq_disconnect_from(self->seq, self->port_id, port->remote.client, port->remote.port);
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//snd_seq_disconnect_to(self->seq, self->port_id, port->remote.client, port->remote.port);
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if (port->early_events)
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jack_ringbuffer_free(port->early_events);
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if (port->jack_port)
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jack_port_unregister(self->jack, port->jack_port);
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info_log("port deleted: %s", port->name);
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free(port);
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}
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static
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port_t* port_create(alsa_seqmidi_t *self, int type, snd_seq_addr_t addr, const snd_seq_port_info_t *info)
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{
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snd_seq_client_info_t* client_info;
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port_t *port;
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char *c;
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int err;
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int jack_caps;
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char name[128];
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port = calloc(1, sizeof(port_t));
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if (!port)
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return NULL;
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port->remote = addr;
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snd_seq_client_info_alloca (&client_info);
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snd_seq_get_any_client_info (self->seq, addr.client, client_info);
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jack_caps = port_type[type].jack_caps;
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/* mark anything that looks like a hardware port as physical&terminal */
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if (snd_seq_port_info_get_type (info) & (SND_SEQ_PORT_TYPE_HARDWARE|SND_SEQ_PORT_TYPE_PORT|SND_SEQ_PORT_TYPE_SPECIFIC)) {
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jack_caps |= (JackPortIsPhysical | JackPortIsTerminal);
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}
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if (jack_caps & JackPortIsOutput)
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snprintf(name, sizeof(name), "system:midi_capture_%d", ++self->midi_in_cnt);
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else
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snprintf(name, sizeof(name), "system:midi_playback_%d", ++self->midi_out_cnt);
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port->jack_port = jack_port_register(self->jack,
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name, JACK_DEFAULT_MIDI_TYPE, jack_caps, 0);
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if (!port->jack_port)
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goto failed;
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|
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// First alias: Jack1-compatible port name. -ag
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const char *prefix = "alsa_midi:";
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const char *device_name = snd_seq_client_info_get_name(client_info);
|
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const char* port_name = snd_seq_port_info_get_name (info);
|
|
const char* type_name = jack_caps & JackPortIsOutput ? "out" : "in";
|
|
// This code is pilfered from Jack1. -ag
|
|
if (strstr (port_name, device_name) == port_name) {
|
|
/* entire client name is part of the port name so don't replicate it */
|
|
snprintf (port->name,
|
|
sizeof(port->name),
|
|
"%s%s (%s)",
|
|
prefix,
|
|
port_name,
|
|
type_name);
|
|
} else {
|
|
snprintf (port->name,
|
|
sizeof(port->name),
|
|
"%s%s %s (%s)",
|
|
prefix,
|
|
device_name,
|
|
port_name,
|
|
type_name);
|
|
}
|
|
|
|
// replace all offending characters with ' '
|
|
for (c = port->name; *c; ++c) {
|
|
if (!isalnum(*c) && *c != ' ' && *c != '/' && *c != '_' && *c != ':' && *c != '(' && *c != ')') {
|
|
*c = ' ';
|
|
}
|
|
}
|
|
|
|
jack_port_set_alias (port->jack_port, port->name);
|
|
// Pretty-name metadata is the same as first alias without the prefix.
|
|
jack_port_set_default_metadata (port->jack_port, port->name+strlen(prefix));
|
|
|
|
// Second alias: Strip the alsa_midi prefix, so that devices appear
|
|
// under their ALSA names. Use the ALSA port names (without device
|
|
// prefix) for the individual ports. -ag
|
|
if (strstr (port_name, device_name) == port_name) {
|
|
// remove the device name prefix from the port name if present
|
|
port_name += strlen(device_name);
|
|
while (*port_name == ' ' || *port_name == '\t')
|
|
port_name++;
|
|
}
|
|
snprintf(port->name, sizeof(port->name), "%s:%s (%s)",
|
|
device_name, port_name, port_type[type].name);
|
|
|
|
// replace all offending characters with ' '
|
|
for (c = port->name; *c; ++c) {
|
|
if (!isalnum(*c) && *c != ' ' && *c != '/' && *c != '_' && *c != ':' && *c != '(' && *c != ')') {
|
|
*c = ' ';
|
|
}
|
|
}
|
|
|
|
jack_port_set_alias (port->jack_port, port->name);
|
|
|
|
if (type == PORT_INPUT)
|
|
err = alsa_connect_from(self, port->remote.client, port->remote.port);
|
|
else
|
|
err = snd_seq_connect_to(self->seq, self->port_id, port->remote.client, port->remote.port);
|
|
if (err)
|
|
goto failed;
|
|
|
|
port->early_events = jack_ringbuffer_create(MAX_EVENT_SIZE*16);
|
|
|
|
info_log("port created: %s", port->name);
|
|
return port;
|
|
|
|
failed:
|
|
port_free(self, port);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* ==================== Port add/del handling thread ==============================
|
|
*/
|
|
static
|
|
void update_port_type(alsa_seqmidi_t *self, int type, snd_seq_addr_t addr, int caps, const snd_seq_port_info_t *info)
|
|
{
|
|
stream_t *str = &self->stream[type];
|
|
int alsa_mask = port_type[type].alsa_mask;
|
|
port_t *port = port_get(str->ports, addr);
|
|
|
|
debug_log("update_port_type(%d:%d)", addr.client, addr.port);
|
|
|
|
if (port && (caps & alsa_mask)!=alsa_mask) {
|
|
debug_log("setdead: %s", port->name);
|
|
port->is_dead = 1;
|
|
}
|
|
|
|
if (!port && (caps & alsa_mask)==alsa_mask) {
|
|
assert (jack_ringbuffer_write_space(str->new_ports) >= sizeof(port));
|
|
port = port_create(self, type, addr, info);
|
|
if (port)
|
|
jack_ringbuffer_write(str->new_ports, (char*)&port, sizeof(port));
|
|
}
|
|
}
|
|
|
|
static
|
|
void update_port(alsa_seqmidi_t *self, snd_seq_addr_t addr, const snd_seq_port_info_t *info)
|
|
{
|
|
unsigned int port_caps = snd_seq_port_info_get_capability(info);
|
|
if (port_caps & SND_SEQ_PORT_CAP_NO_EXPORT)
|
|
return;
|
|
update_port_type(self, PORT_INPUT, addr, port_caps, info);
|
|
update_port_type(self, PORT_OUTPUT,addr, port_caps, info);
|
|
}
|
|
|
|
static
|
|
void free_ports(alsa_seqmidi_t *self, jack_ringbuffer_t *ports)
|
|
{
|
|
port_t *port;
|
|
int sz;
|
|
while ((sz = jack_ringbuffer_read(ports, (char*)&port, sizeof(port)))) {
|
|
assert (sz == sizeof(port));
|
|
port_free(self, port);
|
|
}
|
|
}
|
|
|
|
static
|
|
void update_ports(alsa_seqmidi_t *self)
|
|
{
|
|
snd_seq_addr_t addr;
|
|
snd_seq_port_info_t *info;
|
|
int size;
|
|
|
|
snd_seq_port_info_alloca(&info);
|
|
|
|
while ((size = jack_ringbuffer_read(self->port_add, (char*)&addr, sizeof(addr)))) {
|
|
|
|
int err;
|
|
|
|
assert (size == sizeof(addr));
|
|
assert (addr.client != self->client_id);
|
|
if ((err=snd_seq_get_any_port_info(self->seq, addr.client, addr.port, info))>=0) {
|
|
update_port(self, addr, info);
|
|
} else {
|
|
//port_setdead(self->stream[PORT_INPUT].ports, addr);
|
|
//port_setdead(self->stream[PORT_OUTPUT].ports, addr);
|
|
}
|
|
}
|
|
}
|
|
|
|
static
|
|
void* port_thread(void *arg)
|
|
{
|
|
alsa_seqmidi_t *self = arg;
|
|
|
|
while (self->keep_walking) {
|
|
sem_wait(&self->port_sem);
|
|
free_ports(self, self->port_del);
|
|
update_ports(self);
|
|
}
|
|
debug_log("port_thread exited");
|
|
return NULL;
|
|
}
|
|
|
|
static
|
|
void add_existing_ports(alsa_seqmidi_t *self)
|
|
{
|
|
snd_seq_addr_t addr;
|
|
snd_seq_client_info_t *client_info;
|
|
snd_seq_port_info_t *port_info;
|
|
|
|
snd_seq_client_info_alloca(&client_info);
|
|
snd_seq_port_info_alloca(&port_info);
|
|
snd_seq_client_info_set_client(client_info, -1);
|
|
while (snd_seq_query_next_client(self->seq, client_info) >= 0)
|
|
{
|
|
addr.client = snd_seq_client_info_get_client(client_info);
|
|
if (addr.client == SND_SEQ_CLIENT_SYSTEM || addr.client == self->client_id)
|
|
continue;
|
|
snd_seq_port_info_set_client(port_info, addr.client);
|
|
snd_seq_port_info_set_port(port_info, -1);
|
|
while (snd_seq_query_next_port(self->seq, port_info) >= 0)
|
|
{
|
|
addr.port = snd_seq_port_info_get_port(port_info);
|
|
update_port(self, addr, port_info);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* =================== Input/output port handling =========================
|
|
*/
|
|
static
|
|
void set_process_info(struct process_info *info, alsa_seqmidi_t *self, int dir, jack_nframes_t nframes)
|
|
{
|
|
const snd_seq_real_time_t* alsa_time;
|
|
snd_seq_queue_status_t *status;
|
|
|
|
snd_seq_queue_status_alloca(&status);
|
|
|
|
info->dir = dir;
|
|
|
|
info->period_start = jack_last_frame_time(self->jack);
|
|
info->nframes = nframes;
|
|
info->sample_rate = jack_get_sample_rate(self->jack);
|
|
|
|
info->cur_frames = jack_frame_time(self->jack);
|
|
|
|
// immediately get alsa'a real time (uhh, why everybody has their own 'real' time)
|
|
snd_seq_get_queue_status(self->seq, self->queue, status);
|
|
alsa_time = snd_seq_queue_status_get_real_time(status);
|
|
info->alsa_time = alsa_time->tv_sec * NSEC_PER_SEC + alsa_time->tv_nsec;
|
|
|
|
if (info->period_start + info->nframes < info->cur_frames) {
|
|
int periods_lost = (info->cur_frames - info->period_start) / info->nframes;
|
|
info->period_start += periods_lost * info->nframes;
|
|
debug_log("xrun detected: %d periods lost\n", periods_lost);
|
|
}
|
|
}
|
|
|
|
static
|
|
void add_ports(stream_t *str)
|
|
{
|
|
port_t *port;
|
|
while (jack_ringbuffer_read(str->new_ports, (char*)&port, sizeof(port))) {
|
|
debug_log("jack: inserted port %s\n", port->name);
|
|
port_insert(str->ports, port);
|
|
}
|
|
}
|
|
|
|
static
|
|
void jack_process(alsa_seqmidi_t *self, struct process_info *info)
|
|
{
|
|
stream_t *str = &self->stream[info->dir];
|
|
port_jack_func process = port_type[info->dir].jack_func;
|
|
int i, del=0;
|
|
|
|
add_ports(str);
|
|
|
|
// process ports
|
|
for (i=0; i<PORT_HASH_SIZE; ++i) {
|
|
port_t **pport = &str->ports[i];
|
|
while (*pport) {
|
|
port_t *port = *pport;
|
|
port->jack_buf = jack_port_get_buffer(port->jack_port, info->nframes);
|
|
if (info->dir == PORT_INPUT)
|
|
jack_midi_clear_buffer(port->jack_buf);
|
|
|
|
if (!port->is_dead)
|
|
(*process)(self, port, info);
|
|
else if (jack_ringbuffer_write_space(self->port_del) >= sizeof(port)) {
|
|
debug_log("jack: removed port %s", port->name);
|
|
*pport = port->next;
|
|
jack_ringbuffer_write(self->port_del, (char*)&port, sizeof(port));
|
|
del++;
|
|
continue;
|
|
}
|
|
|
|
pport = &port->next;
|
|
}
|
|
}
|
|
|
|
if (del)
|
|
sem_post(&self->port_sem);
|
|
}
|
|
|
|
/*
|
|
* ============================ Input ==============================
|
|
*/
|
|
static
|
|
void do_jack_input(alsa_seqmidi_t *self, port_t *port, struct process_info *info)
|
|
{
|
|
// process port->early_events
|
|
alsa_midi_event_t ev;
|
|
while (jack_ringbuffer_read(port->early_events, (char*)&ev, sizeof(ev))) {
|
|
jack_midi_data_t* buf;
|
|
int64_t time = ev.time - info->period_start;
|
|
if (time < 0)
|
|
time = 0;
|
|
else if (time >= info->nframes)
|
|
time = info->nframes - 1;
|
|
buf = jack_midi_event_reserve(port->jack_buf, (jack_nframes_t)time, ev.size);
|
|
if (buf)
|
|
jack_ringbuffer_read(port->early_events, (char*)buf, ev.size);
|
|
else
|
|
jack_ringbuffer_read_advance(port->early_events, ev.size);
|
|
debug_log("input: it's time for %d bytes at %lld", ev.size, time);
|
|
}
|
|
}
|
|
|
|
static
|
|
void port_event(alsa_seqmidi_t *self, snd_seq_event_t *ev)
|
|
{
|
|
const snd_seq_addr_t addr = ev->data.addr;
|
|
|
|
if (addr.client == self->client_id)
|
|
return;
|
|
|
|
if (ev->type == SND_SEQ_EVENT_PORT_START || ev->type == SND_SEQ_EVENT_PORT_CHANGE) {
|
|
assert (jack_ringbuffer_write_space(self->port_add) >= sizeof(addr));
|
|
|
|
debug_log("port_event: add/change %d:%d", addr.client, addr.port);
|
|
jack_ringbuffer_write(self->port_add, (char*)&addr, sizeof(addr));
|
|
sem_post(&self->port_sem);
|
|
} else if (ev->type == SND_SEQ_EVENT_PORT_EXIT) {
|
|
debug_log("port_event: del %d:%d", addr.client, addr.port);
|
|
port_setdead(self->stream[PORT_INPUT].ports, addr);
|
|
port_setdead(self->stream[PORT_OUTPUT].ports, addr);
|
|
}
|
|
}
|
|
|
|
static
|
|
void input_event(alsa_seqmidi_t *self, snd_seq_event_t *alsa_event, struct process_info* info)
|
|
{
|
|
jack_midi_data_t data[MAX_EVENT_SIZE];
|
|
stream_t *str = &self->stream[PORT_INPUT];
|
|
long size;
|
|
int64_t alsa_time, time_offset;
|
|
int64_t frame_offset, event_frame;
|
|
port_t *port;
|
|
|
|
port = port_get(str->ports, alsa_event->source);
|
|
if (!port)
|
|
return;
|
|
|
|
/*
|
|
* RPNs, NRPNs, Bank Change, etc. need special handling
|
|
* but seems, ALSA does it for us already.
|
|
*/
|
|
snd_midi_event_reset_decode(str->codec);
|
|
if ((size = snd_midi_event_decode(str->codec, data, sizeof(data), alsa_event))<0)
|
|
return;
|
|
|
|
// fixup NoteOn with vel 0
|
|
if ((data[0] & 0xF0) == 0x90 && data[2] == 0x00) {
|
|
data[0] = 0x80 + (data[0] & 0x0F);
|
|
data[2] = 0x40;
|
|
}
|
|
|
|
alsa_time = alsa_event->time.time.tv_sec * NSEC_PER_SEC + alsa_event->time.time.tv_nsec;
|
|
time_offset = info->alsa_time - alsa_time;
|
|
frame_offset = (info->sample_rate * time_offset) / NSEC_PER_SEC;
|
|
event_frame = (int64_t)info->cur_frames - info->period_start - frame_offset + info->nframes;
|
|
|
|
debug_log("input: %d bytes at event_frame = %d", (int)size, (int)event_frame);
|
|
|
|
if (event_frame >= info->nframes &&
|
|
jack_ringbuffer_write_space(port->early_events) >= (sizeof(alsa_midi_event_t) + size)) {
|
|
alsa_midi_event_t ev;
|
|
ev.time = event_frame + info->period_start;
|
|
ev.size = size;
|
|
jack_ringbuffer_write(port->early_events, (char*)&ev, sizeof(ev));
|
|
jack_ringbuffer_write(port->early_events, (char*)data, size);
|
|
debug_log("postponed to next frame +%d", (int) (event_frame - info->nframes));
|
|
return;
|
|
}
|
|
|
|
if (event_frame < 0)
|
|
event_frame = 0;
|
|
else if (event_frame >= info->nframes)
|
|
event_frame = info->nframes - 1;
|
|
|
|
jack_midi_event_write(port->jack_buf, event_frame, data, size);
|
|
}
|
|
|
|
static
|
|
void alsa_seqmidi_read(alsa_midi_t *m, jack_nframes_t nframes)
|
|
{
|
|
alsa_seqmidi_t *self = (alsa_seqmidi_t*) m;
|
|
int res;
|
|
snd_seq_event_t *event;
|
|
struct process_info info;
|
|
|
|
if (!self->keep_walking)
|
|
return;
|
|
|
|
set_process_info(&info, self, PORT_INPUT, nframes);
|
|
jack_process(self, &info);
|
|
|
|
while ((res = snd_seq_event_input(self->seq, &event))>0) {
|
|
if (event->source.client == SND_SEQ_CLIENT_SYSTEM)
|
|
port_event(self, event);
|
|
else
|
|
input_event(self, event, &info);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* ============================ Output ==============================
|
|
*/
|
|
|
|
static
|
|
void do_jack_output(alsa_seqmidi_t *self, port_t *port, struct process_info* info)
|
|
{
|
|
stream_t *str = &self->stream[info->dir];
|
|
int nevents = jack_midi_get_event_count(port->jack_buf);
|
|
int i, err;
|
|
for (i=0; i<nevents; ++i) {
|
|
jack_midi_event_t jack_event;
|
|
snd_seq_event_t alsa_event;
|
|
int64_t frame_offset;
|
|
int64_t out_time;
|
|
snd_seq_real_time_t out_rt;
|
|
|
|
jack_midi_event_get(&jack_event, port->jack_buf, i);
|
|
|
|
snd_seq_ev_clear(&alsa_event);
|
|
snd_midi_event_reset_encode(str->codec);
|
|
if (!snd_midi_event_encode(str->codec, jack_event.buffer, jack_event.size, &alsa_event))
|
|
continue; // invalid event
|
|
|
|
snd_seq_ev_set_source(&alsa_event, self->port_id);
|
|
snd_seq_ev_set_dest(&alsa_event, port->remote.client, port->remote.port);
|
|
|
|
/* NOTE: in case of xrun it could become negative, so it is essential to use signed type! */
|
|
frame_offset = (int64_t)jack_event.time + info->period_start + info->nframes - info->cur_frames;
|
|
if (frame_offset < 0) {
|
|
frame_offset = info->nframes + jack_event.time;
|
|
error_log("internal xrun detected: frame_offset = %"PRId64"\n", frame_offset);
|
|
}
|
|
/* Ken Ellinwood reported problems with this assert.
|
|
* Seems, magic 2 should be replaced with nperiods. */
|
|
//FIXME: assert (frame_offset < info->nframes*2);
|
|
//if (frame_offset < info->nframes * info->nperiods)
|
|
// debug_log("alsa_out: BLAH-BLAH-BLAH");
|
|
|
|
out_time = info->alsa_time + (frame_offset * NSEC_PER_SEC) / info->sample_rate;
|
|
|
|
debug_log("alsa_out: frame_offset = %lld, info->alsa_time = %lld, out_time = %lld, port->last_out_time = %lld",
|
|
frame_offset, info->alsa_time, out_time, port->last_out_time);
|
|
|
|
// we should use absolute time to prevent reordering caused by rounding errors
|
|
if (out_time < port->last_out_time) {
|
|
debug_log("alsa_out: limiting out_time %lld at %lld", out_time, port->last_out_time);
|
|
out_time = port->last_out_time;
|
|
} else
|
|
port->last_out_time = out_time;
|
|
|
|
out_rt.tv_nsec = out_time % NSEC_PER_SEC;
|
|
out_rt.tv_sec = out_time / NSEC_PER_SEC;
|
|
snd_seq_ev_schedule_real(&alsa_event, self->queue, 0, &out_rt);
|
|
|
|
err = snd_seq_event_output(self->seq, &alsa_event);
|
|
debug_log("alsa_out: written %d bytes to %s at %+d (%lld): %d", (int)jack_event.size, port->name, (int)frame_offset, out_time, err);
|
|
}
|
|
return;
|
|
|
|
// may be unused
|
|
(void)err;
|
|
}
|
|
|
|
static
|
|
void alsa_seqmidi_write(alsa_midi_t *m, jack_nframes_t nframes)
|
|
{
|
|
alsa_seqmidi_t *self = (alsa_seqmidi_t*) m;
|
|
struct process_info info;
|
|
|
|
if (!self->keep_walking)
|
|
return;
|
|
|
|
set_process_info(&info, self, PORT_OUTPUT, nframes);
|
|
jack_process(self, &info);
|
|
snd_seq_drain_output(self->seq);
|
|
}
|