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https://gitlab.freedesktop.org/pipewire/pipewire.git
synced 2025-11-02 09:01:50 -05:00
pw-cat: add midi recording
This commit is contained in:
Wim Taymans
parent
d31d6b59f1
commit
a3582f0e0f
3 changed files with 148 additions and 51 deletions
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@ -194,6 +194,8 @@ static int write_headers(struct midi_file *mf)
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uint8_t buf[4];
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struct midi_track *tr = &mf->tracks[0];
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mf->length = 6;
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lseek(mf->fd, 0, SEEK_SET);
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write(mf->fd, "MThd", 4);
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@ -219,6 +221,8 @@ static int write_headers(struct midi_file *mf)
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buf[3] = tr->size;
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write(mf->fd, buf, 4);
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tr->size = 4;
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return 0;
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}
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@ -233,13 +237,15 @@ static int open_write(struct midi_file *mf, const char *filename, struct midi_fi
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else if (info->ntracks != 1)
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return -EINVAL;
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if (info->division == 0)
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info->division = 1920;
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info->division = 96;
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if ((mf->fd = open(filename, O_WRONLY | O_CREAT, 0660)) < 0) {
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res = -errno;
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goto exit;
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}
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mf->mode = 2;
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mf->tempo = DEFAULT_TEMPO;
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mf->info = *info;
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write_headers(mf);
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@ -281,6 +287,8 @@ int midi_file_close(struct midi_file *mf)
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if (mf->mode == 1) {
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munmap(mf->data, mf->size);
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} else if (mf->mode == 2) {
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uint8_t buf[4] = { 0x00, 0xff, 0x2f, 0x00 };
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write(mf->fd, buf, 4);
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write_headers(mf);
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} else
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return -EINVAL;
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@ -290,20 +298,52 @@ int midi_file_close(struct midi_file *mf)
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return 0;
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}
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static int peek_event(struct midi_file *mf, struct midi_track *tr, struct midi_event *event)
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static int peek_next(struct midi_file *mf, struct midi_event *ev)
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{
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uint8_t *save, status;
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uint32_t size;
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int res;
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struct midi_track *tr, *found = NULL;
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uint16_t i;
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if (tr_avail(tr) == 0)
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for (i = 0; i < mf->info.ntracks; i++) {
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tr = &mf->tracks[i];
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if (tr_avail(tr) == 0)
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continue;
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if (found == NULL || tr->tick < found->tick)
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found = tr;
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}
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if (found == NULL ||
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tr_avail(found) == 0)
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return 0;
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save = tr->p;
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status = *tr->p;
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ev->track = found->id;
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ev->sec = mf->tick_sec + ((found->tick - mf->tick_start) * (double)mf->tempo) / (1000000.0 * mf->info.division);
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return 1;
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}
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event->track = tr->id;
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event->sec = mf->tick_sec + ((tr->tick - mf->tick_start) * (double)mf->tempo) / (1000000.0 * mf->info.division);
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int midi_file_next_time(struct midi_file *mf, double *sec)
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{
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struct midi_event ev;
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int res;
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if ((res = peek_next(mf, &ev)) <= 0)
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return res;
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*sec = ev.sec;
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return 1;
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}
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int midi_file_read_event(struct midi_file *mf, struct midi_event *event)
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{
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struct midi_track *tr;
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uint32_t delta_time;
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uint32_t size;
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uint8_t status;
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int res;
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if ((res = peek_next(mf, event)) <= 0)
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return res;
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tr = &mf->tracks[event->track];
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status = *tr->p;
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if ((status & 0x80) == 0) {
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status = tr->running_status;
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@ -351,57 +391,86 @@ static int peek_event(struct midi_file *mf, struct midi_track *tr, struct midi_e
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default:
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return -ENOENT;
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}
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event->data = tr->p;
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tr->p = save;
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event->size = size;
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return 1;
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}
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int midi_file_peek_event(struct midi_file *mf, struct midi_event *event)
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{
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struct midi_track *tr, *found = NULL;
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uint16_t i;
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for (i = 0; i < mf->info.ntracks; i++) {
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tr = &mf->tracks[i];
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if (tr_avail(tr) == 0)
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continue;
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if (found == NULL || tr->tick < found->tick)
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found = tr;
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}
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if (found == NULL)
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return 0;
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return peek_event(mf, found, event);
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}
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int midi_file_consume_event(struct midi_file *mf, const struct midi_event *event)
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{
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struct midi_track *tr = &mf->tracks[event->track];
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uint32_t delta_time;
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int res;
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tr->p = event->data + event->size;
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tr->p += size;
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if ((res = parse_varlen(mf, tr, &delta_time)) < 0)
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return res;
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tr->tick += delta_time;
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return 1;
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}
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static int write_varlen(struct midi_file *mf, struct midi_track *tr, uint32_t value)
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{
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uint64_t buffer;
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buffer = value & 0x7f;
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while ((value >>= 7)) {
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buffer <<= 8;
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buffer |= ((value & 0x7f) | 0x80);
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}
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for (;;) {
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uint8_t b = buffer & 0xff;
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write(mf->fd, &b, 1);
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tr->size++;
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if (buffer & 0x80)
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buffer >>= 8;
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else
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break;
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}
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return 0;
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}
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int midi_file_add_event(struct midi_file *mf, const struct midi_event *event)
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int midi_file_write_event(struct midi_file *mf, const struct midi_event *event)
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{
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struct midi_track *tr;
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uint32_t size, tick;
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uint8_t status, *data;
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spa_return_val_if_fail(event != NULL, -EINVAL);
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spa_return_val_if_fail(mf != NULL, -EINVAL);
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spa_return_val_if_fail(event->track == 0, -EINVAL);
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spa_return_val_if_fail(event->size > 1, -EINVAL);
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tr = &mf->tracks[event->track];
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data = event->data;
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size = event->size;
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tick = event->sec * (1000000.0 * mf->info.division) / (double)mf->tempo;
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write_varlen(mf, tr, tick - tr->tick);
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tr->tick = tick;
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status = *data++;
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size--;
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switch (status) {
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case 0xc0 ... 0xdf:
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if (size != 1)
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return -EINVAL;
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break;
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case 0x00 ... 0xbf:
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case 0xe0 ... 0xef:
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if (size != 2)
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return -EINVAL;
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break;
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case 0xff:
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case 0xf0:
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case 0xf7:
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return -ENOTSUP;
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default:
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return -EINVAL;
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}
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write(mf->fd, &status, 1);
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write(mf->fd, data, size);
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tr->size += 1 + size;
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return 0;
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}
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@ -48,7 +48,8 @@ midi_file_open(const char *filename, const char *mode, struct midi_file_info *in
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int midi_file_close(struct midi_file *mf);
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int midi_file_peek_event(struct midi_file *mf, struct midi_event *event);
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int midi_file_consume_event(struct midi_file *mf, const struct midi_event *event);
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int midi_file_next_time(struct midi_file *mf, double *sec);
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int midi_file_add_event(struct midi_file *mf, const struct midi_event *event);
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int midi_file_read_event(struct midi_file *mf, struct midi_event *event);
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int midi_file_write_event(struct midi_file *mf, const struct midi_event *event);
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@ -953,7 +953,6 @@ static void show_usage(const char *name, bool is_error)
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static int midi_play(struct data *d, void *src, unsigned int n_frames)
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{
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int res;
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struct midi_event ev;
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struct spa_pod_builder b;
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struct spa_pod_frame f;
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uint32_t first_frame, last_frame;
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@ -971,19 +970,16 @@ static int midi_play(struct data *d, void *src, unsigned int n_frames)
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while (1) {
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uint32_t frame;
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uint8_t *buf;
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struct midi_event ev;
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res = midi_file_peek_event(d->midi.file, &ev);
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res = midi_file_next_time(d->midi.file, &ev.sec);
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if (res <= 0) {
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if (have_data)
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break;
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return res;
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}
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if (ev.status == 0xff)
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goto next;
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frame = ev.sec * d->position->clock.rate.denom;
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if (frame < first_frame)
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frame = 0;
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else if (frame < last_frame)
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@ -991,14 +987,16 @@ static int midi_play(struct data *d, void *src, unsigned int n_frames)
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else
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break;
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midi_file_read_event(d->midi.file, &ev);
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if (ev.status == 0xff)
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continue;
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spa_pod_builder_control(&b, frame, SPA_CONTROL_Midi);
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if ((buf = spa_pod_builder_reserve_bytes(&b, ev.size + 1)) != NULL) {
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buf[0] = ev.status;
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memcpy(&buf[1], ev.data, ev.size);
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}
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have_data = true;
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next:
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midi_file_consume_event(d->midi.file, &ev);
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}
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spa_pod_builder_pop(&b, &f);
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@ -1007,6 +1005,33 @@ next:
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static int midi_record(struct data *d, void *src, unsigned int n_frames)
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{
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struct spa_pod *pod;
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struct spa_pod_control *c;
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uint32_t frame;
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frame = d->clock_time;
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d->clock_time += d->position->clock.duration;
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if ((pod = spa_pod_from_data(src, n_frames, 0, n_frames)) == NULL)
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return 0;
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if (!spa_pod_is_sequence(pod))
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return 0;
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SPA_POD_SEQUENCE_FOREACH((struct spa_pod_sequence*)pod, c) {
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struct midi_event ev;
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if (c->type != SPA_CONTROL_Midi)
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continue;
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ev.track = 0;
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ev.sec = (frame + c->offset) / (float) d->position->clock.rate.denom;
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ev.status = 0;
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ev.meta = 0;
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ev.data = SPA_POD_BODY(&c->value),
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ev.size = SPA_POD_BODY_SIZE(&c->value);
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midi_file_write_event(d->midi.file, &ev);
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}
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return 0;
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}
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@ -1562,6 +1587,8 @@ error_bad_file:
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pw_properties_free(data.props);
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if (data.file)
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sf_close(data.file);
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if (data.midi.file)
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midi_file_close(data.midi.file);
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return exit_code;
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error_usage:
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