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midizap/jackdriver.c

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/* AG: This is a trimmed-down version of the Jack MIDI driver pilfered from
Spencer Jackson's osc2midi program, cf. https://github.com/ssj71/OSC2MIDI. */
/*-
* Copyright (c) 2014 Spencer Jackson <ssjackson71@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/time.h>
#include <unistd.h>
#include <assert.h>
#include <string.h>
#include <sysexits.h>
#include <errno.h>
#include <jack/jack.h>
#include <jack/midiport.h>
#include <jack/ringbuffer.h>
#include "jackdriver.h"
typedef struct _MidiMessage
{
jack_nframes_t time;
int len; /* Length of MIDI message, in bytes. */
uint8_t data[3];
} MidiMessage;
#define RINGBUFFER_SIZE 16384*sizeof(MidiMessage)
/* Will emit a warning if time between jack callbacks is longer than this. */
#define MAX_TIME_BETWEEN_CALLBACKS 0.1
/* Will emit a warning if execution of jack callback takes longer than this. */
#define MAX_PROCESSING_TIME 0.01
///////////////////////////////////////////////
//These functions operate in the JACK RT Thread
///////////////////////////////////////////////
double
get_time(void)
{
double seconds;
int ret;
struct timeval tv;
ret = gettimeofday(&tv, NULL);
if (ret)
{
perror("gettimeofday");
exit(EX_OSERR);
}
seconds = tv.tv_sec + tv.tv_usec / 1000000.0;
return (seconds);
}
double
get_delta_time(void)
{
static double previously = -1.0;
double now;
double delta;
now = get_time();
if (previously == -1.0)
{
previously = now;
return (0);
}
delta = now - previously;
previously = now;
assert(delta >= 0.0);
return (delta);
}
double
nframes_to_ms(jack_client_t* jack_client,jack_nframes_t nframes)
{
jack_nframes_t sr;
sr = jack_get_sample_rate(jack_client);
assert(sr > 0);
return ((nframes * 1000.0) / (double)sr);
}
void
queue_message(jack_ringbuffer_t* ringbuffer, MidiMessage *ev)
{
int written;
if (jack_ringbuffer_write_space(ringbuffer) < sizeof(*ev))
{
fprintf(stderr, "Not enough space in the ringbuffer, MIDI LOST.\n");
return;
}
written = jack_ringbuffer_write(ringbuffer, (char *)ev, sizeof(*ev));
if (written != sizeof(*ev))
fprintf(stderr, "jack_ringbuffer_write failed, MIDI LOST.\n");
}
void
process_midi_input(JACK_SEQ* seq,jack_nframes_t nframes)
{
int k;
for (k = 0; k < seq->n_in; k++) {
int read, events, i;
MidiMessage rev;
jack_midi_event_t event;
void *port_buffer = jack_port_get_buffer(seq->input_port[k], nframes);
if (port_buffer == NULL)
{
fprintf(stderr, "jack_port_get_buffer failed, cannot receive anything.\n");
return;
}
#ifdef JACK_MIDI_NEEDS_NFRAMES
events = jack_midi_get_event_count(port_buffer, nframes);
#else
events = jack_midi_get_event_count(port_buffer);
#endif
for (i = 0; i < events; i++)
{
#ifdef JACK_MIDI_NEEDS_NFRAMES
read = jack_midi_event_get(&event, port_buffer, i, nframes);
#else
read = jack_midi_event_get(&event, port_buffer, i);
#endif
if (!read)
{
//successful event get
if (event.size <= 3 && event.size >= 1)
{
//not sysex or something
//PUSH ONTO CIRCULAR BUFFER
//not sure if its a true copy onto buffer, if not this won't work
rev.len = event.size;
rev.time = event.time;
memcpy(rev.data, event.buffer, rev.len);
queue_message(seq->ringbuffer_in[k],&rev);
}
}
}
}
}
void
process_midi_output(JACK_SEQ* seq,jack_nframes_t nframes)
{
jack_nframes_t last_frame_time = jack_last_frame_time(seq->jack_client);
int k;
for (k = 0; k < seq->n_out; k++) {
int read, t;
uint8_t *buffer;
void *port_buffer;
MidiMessage ev;
port_buffer = jack_port_get_buffer(seq->output_port[k], nframes);
if (port_buffer == NULL)
{
fprintf(stderr, "jack_port_get_buffer failed, cannot send anything.\n");
return;
}
#ifdef JACK_MIDI_NEEDS_NFRAMES
jack_midi_clear_buffer(port_buffer, nframes);
#else
jack_midi_clear_buffer(port_buffer);
#endif
while (jack_ringbuffer_read_space(seq->ringbuffer_out[k]))
{
read = jack_ringbuffer_peek(seq->ringbuffer_out[k], (char *)&ev, sizeof(ev));
if (read != sizeof(ev))
{
//warn_from_jack_thread_context("Short read from the ringbuffer, possible note loss.");
jack_ringbuffer_read_advance(seq->ringbuffer_out[k], read);
continue;
}
t = ev.time + nframes - last_frame_time;
/* If computed time is too much into the future, we'll need
to send it later. */
if (t >= (int)nframes)
break;
/* If computed time is < 0, we missed a cycle because of xrun. */
if (t < 0)
t = 0;
jack_ringbuffer_read_advance(seq->ringbuffer_out[k], sizeof(ev));
#ifdef JACK_MIDI_NEEDS_NFRAMES
buffer = jack_midi_event_reserve(port_buffer, t, ev.len, nframes);
#else
buffer = jack_midi_event_reserve(port_buffer, t, ev.len);
#endif
if (buffer == NULL)
{
//warn_from_jack_thread_context("jack_midi_event_reserve failed, NOTE LOST.");
break;
}
memcpy(buffer, ev.data, ev.len);
}
}
}
int
process_callback(jack_nframes_t nframes, void *seqq)
{
JACK_SEQ* seq = (JACK_SEQ*)seqq;
#ifdef MEASURE_TIME
if (get_delta_time() > MAX_TIME_BETWEEN_CALLBACKS)
fprintf(stderr, "Had to wait too long for JACK callback; scheduling problem?\n");
#endif
if(seq->n_in)
process_midi_input( seq,nframes );
if(seq->n_out)
process_midi_output( seq,nframes );
#ifdef MEASURE_TIME
if (get_delta_time() > MAX_PROCESSING_TIME)
fprintf(stderr, "Processing took too long; scheduling problem?\n");
#endif
return (0);
}
///////////////////////////////////////////////
//these functions are executed in other threads
///////////////////////////////////////////////
void queue_midi(void* seqq, uint8_t msg[], uint8_t port_no)
{
MidiMessage ev;
JACK_SEQ* seq = (JACK_SEQ*)seqq;
ev.len = 3;
// At least with JackOSX, Jack will transmit the bytes verbatim, so make
// sure that we look at the status byte and trim the message accordingly,
// in order not to transmit any invalid MIDI data.
switch (msg[0] & 0xf0)
{
case 0x80:
case 0x90:
case 0xa0:
case 0xb0:
case 0xe0:
break; // 2 data bytes
case 0xc0:
case 0xd0:
ev.len = 2; // 1 data byte
break;
case 0xf0: // system message
switch (msg[0])
{
case 0xf2:
break; // 2 data bytes
case 0xf1:
case 0xf3:
ev.len = 2; // 1 data byte
break;
case 0xf6:
case 0xf8:
case 0xf9:
case 0xfa:
case 0xfb:
case 0xfc:
case 0xfe:
case 0xff:
ev.len = 1; // no data byte
break;
default:
// ignore unknown (most likely sysex)
return;
}
break;
default:
return; // not a valid MIDI message, bail out
}
ev.data[0] = msg[0];
ev.data[1] = msg[1];
ev.data[2] = msg[2];
ev.time = jack_frame_time(seq->jack_client);
queue_message(seq->ringbuffer_out[port_no],&ev);
}
int pop_midi(void* seqq, uint8_t msg[], uint8_t *port_no)
{
int read, k;
MidiMessage ev;
JACK_SEQ* seq = (JACK_SEQ*)seqq;
for (k = 0; k < seq->n_in; k++) {
if (jack_ringbuffer_read_space(seq->ringbuffer_in[k]))
{
read = jack_ringbuffer_peek(seq->ringbuffer_in[k], (char *)&ev, sizeof(ev));
if (read != sizeof(ev))
{
//warn_from_jack_thread_context("Short read from the ringbuffer, possible note loss.");
jack_ringbuffer_read_advance(seq->ringbuffer_in[k], read);
return -1;
}
jack_ringbuffer_read_advance(seq->ringbuffer_in[k], sizeof(ev));
memcpy(msg,ev.data,ev.len);
*port_no = k;
return ev.len;
}
}
return 0;
}
////////////////////////////////
//this is run in the main thread
////////////////////////////////
int
init_jack(JACK_SEQ* seq, uint8_t verbose)
{
int err, k;
char portname[100],
*client_name = seq->client_name?seq->client_name:"midizap";
if(verbose)printf("opening client...\n");
seq->jack_client = jack_client_open(client_name, JackNullOption, NULL);
if (seq->jack_client == NULL)
{
fprintf(stderr, "Could not connect to the JACK server; run jackd first?\n");
return 0;
}
if(verbose)printf("assigning process callback...\n");
err = jack_set_process_callback(seq->jack_client, process_callback, (void*)seq);
if (err)
{
fprintf(stderr, "Could not register JACK process callback.\n");
return 0;
}
seq->ringbuffer_in = NULL;
seq->input_port = NULL;
if(seq->n_in)
{
if(verbose)printf("initializing JACK input: \ncreating ringbuffer...\n");
seq->ringbuffer_in = calloc(seq->n_in, sizeof(jack_ringbuffer_t*));
seq->input_port = calloc(seq->n_in, sizeof(jack_port_t*));
if (!seq->ringbuffer_in || !seq->input_port)
{
fprintf(stderr, "Cannot allocate memory for ports and ringbuffers.\n");
return 0;
}
for (k = 0; k < seq->n_in; k++) {
seq->ringbuffer_in[k] = jack_ringbuffer_create(RINGBUFFER_SIZE);
if (seq->ringbuffer_in[k] == NULL)
{
fprintf(stderr, "Cannot create JACK ringbuffer.\n");
return 0;
}
jack_ringbuffer_mlock(seq->ringbuffer_in[k]);
if (k)
sprintf(portname, "midi_in%d", k+1);
else
strcpy(portname, "midi_in");
seq->input_port[k] = jack_port_register(seq->jack_client, portname,
JACK_DEFAULT_MIDI_TYPE,
JackPortIsInput, 0);
if (seq->input_port[k] == NULL)
{
fprintf(stderr, "Could not register JACK port.\n");
return 0;
}
}
}
seq->ringbuffer_out = NULL;
seq->output_port = NULL;
if(seq->n_out)
{
if(verbose)printf("initializing JACK output: \ncreating ringbuffer...\n");
seq->ringbuffer_out = calloc(seq->n_out, sizeof(jack_ringbuffer_t*));
seq->output_port = calloc(seq->n_out, sizeof(jack_port_t*));
if (!seq->ringbuffer_out || !seq->output_port)
{
fprintf(stderr, "Cannot allocate memory for ports and ringbuffers.\n");
return 0;
}
for (k = 0; k < seq->n_out; k++) {
seq->ringbuffer_out[k] = jack_ringbuffer_create(RINGBUFFER_SIZE);
if (seq->ringbuffer_out[k] == NULL)
{
fprintf(stderr, "Cannot create JACK ringbuffer.\n");
return 0;
}
jack_ringbuffer_mlock(seq->ringbuffer_out[k]);
if (k)
sprintf(portname, "midi_out%d", k+1);
else
strcpy(portname, "midi_out");
seq->output_port[k] = jack_port_register(seq->jack_client, portname,
JACK_DEFAULT_MIDI_TYPE,
JackPortIsOutput, 0);
if (seq->output_port[k] == NULL)
{
fprintf(stderr, "Could not register JACK port.\n");
return 0;
}
}
}
if (jack_activate(seq->jack_client))
{
fprintf(stderr, "Cannot activate JACK client.\n");
return 0;
}
return 1;
}
void close_jack(JACK_SEQ* seq)
{
int k;
if(seq->n_out) {
for (k = 0; k < seq->n_out; k++)
jack_ringbuffer_free(seq->ringbuffer_out[k]);
}
if(seq->n_in) {
for (k = 0; k < seq->n_in; k++)
jack_ringbuffer_free(seq->ringbuffer_in[k]);
}
}
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