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pw-cat: add midi recording

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This commit is contained in:
Wim Taymans 2020-02-27 15:37:12 +01:00
parent d31d6b59f1
commit a3582f0e0f
3 changed files with 148 additions and 51 deletions
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149
src/tools/midifile.c
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@ -194,6 +194,8 @@ static int write_headers(struct midi_file *mf)
uint8_t buf[4];
struct midi_track *tr = &mf->tracks[0];
mf->length = 6;
lseek(mf->fd, 0, SEEK_SET);
write(mf->fd, "MThd", 4);
@ -219,6 +221,8 @@ static int write_headers(struct midi_file *mf)
buf[3] = tr->size;
write(mf->fd, buf, 4);
tr->size = 4;
return 0;
}
@ -233,13 +237,15 @@ static int open_write(struct midi_file *mf, const char *filename, struct midi_fi
else if (info->ntracks != 1)
return -EINVAL;
if (info->division == 0)
info->division = 1920;
info->division = 96;
if ((mf->fd = open(filename, O_WRONLY | O_CREAT, 0660)) < 0) {
res = -errno;
goto exit;
}
mf->mode = 2;
mf->tempo = DEFAULT_TEMPO;
mf->info = *info;
write_headers(mf);
@ -281,6 +287,8 @@ int midi_file_close(struct midi_file *mf)
if (mf->mode == 1) {
munmap(mf->data, mf->size);
} else if (mf->mode == 2) {
uint8_t buf[4] = { 0x00, 0xff, 0x2f, 0x00 };
write(mf->fd, buf, 4);
write_headers(mf);
} else
return -EINVAL;
@ -290,20 +298,52 @@ int midi_file_close(struct midi_file *mf)
return 0;
}
static int peek_event(struct midi_file *mf, struct midi_track *tr, struct midi_event *event)
static int peek_next(struct midi_file *mf, struct midi_event *ev)
{
uint8_t *save, status;
uint32_t size;
int res;
struct midi_track *tr, *found = NULL;
uint16_t i;
if (tr_avail(tr) == 0)
for (i = 0; i < mf->info.ntracks; i++) {
tr = &mf->tracks[i];
if (tr_avail(tr) == 0)
continue;
if (found == NULL || tr->tick < found->tick)
found = tr;
}
if (found == NULL ||
tr_avail(found) == 0)
return 0;
save = tr->p;
status = *tr->p;
ev->track = found->id;
ev->sec = mf->tick_sec + ((found->tick - mf->tick_start) * (double)mf->tempo) / (1000000.0 * mf->info.division);
return 1;
}
event->track = tr->id;
event->sec = mf->tick_sec + ((tr->tick - mf->tick_start) * (double)mf->tempo) / (1000000.0 * mf->info.division);
int midi_file_next_time(struct midi_file *mf, double *sec)
{
struct midi_event ev;
int res;
if ((res = peek_next(mf, &ev)) <= 0)
return res;
*sec = ev.sec;
return 1;
}
int midi_file_read_event(struct midi_file *mf, struct midi_event *event)
{
struct midi_track *tr;
uint32_t delta_time;
uint32_t size;
uint8_t status;
int res;
if ((res = peek_next(mf, event)) <= 0)
return res;
tr = &mf->tracks[event->track];
status = *tr->p;
if ((status & 0x80) == 0) {
status = tr->running_status;
@ -351,57 +391,86 @@ static int peek_event(struct midi_file *mf, struct midi_track *tr, struct midi_e
default:
return -ENOENT;
}
event->data = tr->p;
tr->p = save;
event->size = size;
return 1;
}
int midi_file_peek_event(struct midi_file *mf, struct midi_event *event)
{
struct midi_track *tr, *found = NULL;
uint16_t i;
for (i = 0; i < mf->info.ntracks; i++) {
tr = &mf->tracks[i];
if (tr_avail(tr) == 0)
continue;
if (found == NULL || tr->tick < found->tick)
found = tr;
}
if (found == NULL)
return 0;
return peek_event(mf, found, event);
}
int midi_file_consume_event(struct midi_file *mf, const struct midi_event *event)
{
struct midi_track *tr = &mf->tracks[event->track];
uint32_t delta_time;
int res;
tr->p = event->data + event->size;
tr->p += size;
if ((res = parse_varlen(mf, tr, &delta_time)) < 0)
return res;
tr->tick += delta_time;
return 1;
}
static int write_varlen(struct midi_file *mf, struct midi_track *tr, uint32_t value)
{
uint64_t buffer;
buffer = value & 0x7f;
while ((value >>= 7)) {
buffer <<= 8;
buffer |= ((value & 0x7f) | 0x80);
}
for (;;) {
uint8_t b = buffer & 0xff;
write(mf->fd, &b, 1);
tr->size++;
if (buffer & 0x80)
buffer >>= 8;
else
break;
}
return 0;
}
int midi_file_add_event(struct midi_file *mf, const struct midi_event *event)
int midi_file_write_event(struct midi_file *mf, const struct midi_event *event)
{
struct midi_track *tr;
uint32_t size, tick;
uint8_t status, *data;
spa_return_val_if_fail(event != NULL, -EINVAL);
spa_return_val_if_fail(mf != NULL, -EINVAL);
spa_return_val_if_fail(event->track == 0, -EINVAL);
spa_return_val_if_fail(event->size > 1, -EINVAL);
tr = &mf->tracks[event->track];
data = event->data;
size = event->size;
tick = event->sec * (1000000.0 * mf->info.division) / (double)mf->tempo;
write_varlen(mf, tr, tick - tr->tick);
tr->tick = tick;
status = *data++;
size--;
switch (status) {
case 0xc0 ... 0xdf:
if (size != 1)
return -EINVAL;
break;
case 0x00 ... 0xbf:
case 0xe0 ... 0xef:
if (size != 2)
return -EINVAL;
break;
case 0xff:
case 0xf0:
case 0xf7:
return -ENOTSUP;
default:
return -EINVAL;
}
write(mf->fd, &status, 1);
write(mf->fd, data, size);
tr->size += 1 + size;
return 0;
}