* keyboard". Any "piano keyboard" key knows its own octave and
* accidental already. */
int keyboard_octave;
-
- int midi_fd;
snd_midi_event_t *snd_midi_event;
mnemon_t mnemon;
if (pitch != PITCH_NOT_A_PITCH)
{
- pitch = scherzo_key_spell_pitch (&scherzo->key, pitch);
-
scherzo_press_note (scherzo, pitch);
return TRUE;
if (pitch != PITCH_NOT_A_PITCH)
{
- pitch = scherzo_key_spell_pitch (&scherzo->key, pitch);
-
scherzo_release_note (scherzo, pitch);
return TRUE;
return FALSE;
}
-/* Return true if 'a' and 'b' sound identical, (even if spelled differently)
- *
- * This comparison considers octaves as significant. So Bb and A# in
- * the same octave are considered enharmonic, but Bb and A# in
- * different octaves are not. */
-static int
-_pitches_are_enharmonic (pitch_t a, pitch_t b)
-{
- return pitch_to_midi (a) == pitch_to_midi (b);
-}
-
/* Determine a chord name (if any) from the current notes pressed */
typedef struct analyzed_pitch {
int i;
for (i = 0; i < group->num_pitches; i++)
- if (_pitches_are_enharmonic (group->pitches[i], pitch))
+ if (pitch_enharmonic_to (group->pitches[i], pitch))
pitch_group_remove_pitch_at (group, i);
}
talloc_free (local);
}
+static void
+scherzo_set_key (scherzo_t *scherzo, pitch_t pitch)
+{
+ scherzo_key_init (&scherzo->key, pitch);
+ score_set_key (scherzo->score, pitch);
+}
+
+static bool
+pitches_are_diatonic_scale (pitch_t *pitches, int num_pitches)
+{
+ int diatonic_half_steps[7] = {
+ 0, 2, 4, 5, 7, 9, 11
+ };
+ int half_steps;
+ pitch_t root;
+ int i;
+
+ if (num_pitches < 7)
+ return 0;
+
+ root = pitches[0];
+
+ for (i = 0; i < 7; i++) {
+ half_steps = pitch_from_root_in_half_steps (pitches[i], root);
+ if (half_steps != diatonic_half_steps[i])
+ return false;
+ }
+
+ return true;
+}
+
static void
scherzo_press_note (scherzo_t *scherzo, pitch_t pitch)
{
int i;
+ pitch = scherzo_key_spell_pitch (&scherzo->key, pitch);
+
+#define NUM_RECENT_PITCHES 7
+ static pitch_t recent_pitches[NUM_RECENT_PITCHES];
+
+ memmove (recent_pitches, recent_pitches + 1,
+ (NUM_RECENT_PITCHES - 1) * sizeof (pitch_t));
+ recent_pitches[NUM_RECENT_PITCHES - 1] = pitch;
+
+ if (pitches_are_diatonic_scale (recent_pitches, NUM_RECENT_PITCHES)) {
+ scherzo_set_key (scherzo, recent_pitches[0]);
+
+ /* Respell pitch according to new key. */
+ pitch = scherzo_key_spell_pitch (&scherzo->key, pitch);
+ }
+
/* Do nothing if this note is already pressed. */
for (i = 0; i < scherzo->notes_pressed.num_pitches; i++)
if (scherzo->notes_pressed.pitches[i] == pitch)
static void
scherzo_release_note (scherzo_t *scherzo, pitch_t pitch)
{
+ pitch = scherzo_key_spell_pitch (&scherzo->key, pitch);
+
pitch_group_remove_pitch_enharmonic (&scherzo->notes_pressed, pitch);
scherzo_update_notes_and_chord (scherzo);
}
#endif
+typedef struct
+{
+ scherzo_t *scherzo;
+ int fd;
+} scherzo_midi_closure_t;
+
static int
on_midi_input (unused (GIOChannel *channel),
unused (GIOCondition condition),
void *user_data)
{
+ scherzo_midi_closure_t *closure = user_data;
unsigned char buf[MIDI_BUF_SIZE], *next;
- scherzo_t *scherzo = user_data;
+ scherzo_t *scherzo = closure->scherzo;
+ int fd = closure->fd;
ssize_t remaining;
snd_seq_event_t event;
- remaining = read (scherzo->midi_fd, buf, MIDI_BUF_SIZE);
+ remaining = read (fd, buf, MIDI_BUF_SIZE);
next = buf;
while (remaining) {
return TRUE;
}
+static void *
+listen_to_alsa_midi (void *data)
+{
+ scherzo_midi_closure_t *closure = data;
+ int out_fd = closure->fd;
+ snd_rawmidi_t *midi_in;
+ unsigned char buf[MIDI_BUF_SIZE];
+ ssize_t bytes;
+ int err;
+
+ err = snd_rawmidi_open (&midi_in, NULL, "virtual", 0);
+ if (err) {
+ fprintf (stderr, "Failed to open virtual MIDI handle.");
+ return NULL;
+ }
+
+ while (1) {
+ bytes = snd_rawmidi_read (midi_in, buf, MIDI_BUF_SIZE);
+ write (out_fd, buf, bytes);
+ }
+
+ return NULL;
+}
+
int
main (int argc, char *argv[])
{
GtkWidget *drawing_area;
+ GIOChannel *channel;
scherzo_t scherzo;
+ int alsa_midi_fd[2];
+ scherzo_midi_closure_t midi_out, alsa_midi_in, alsa_midi_out;
int err;
srand (time (NULL));
scherzo.pedal_pressed = 0;
/* Default to key of C Major, naturally. */
- scherzo_key_init (&scherzo.key, PITCH_CLASS_LITERAL (C, NATURAL));
- score_set_key (scherzo.score, scherzo.key.pitch);
+ scherzo_set_key (&scherzo, PITCH_CLASS_LITERAL (C, NATURAL));
mnemon_init (&scherzo.mnemon);
/* XXX: Should create a default file if one cannot be loaded. */
}
#define MIDI_DEVICE "/dev/midi1"
- scherzo.midi_fd = open (MIDI_DEVICE, O_RDONLY);
- if (scherzo.midi_fd < 0) {
- printf ("failed to open " MIDI_DEVICE ". Midi input will not be available.\n");
- } else {
- GIOChannel *channel;
- channel = g_io_channel_unix_new (scherzo.midi_fd);
+ midi_out.scherzo = &scherzo;
+ midi_out.fd = open (MIDI_DEVICE, O_RDONLY);
+ if (midi_out.fd < 0) {
+ printf ("Failed to open " MIDI_DEVICE ". You will need to connect a MIDI device.\n");
+ } else {
+ channel = g_io_channel_unix_new (midi_out.fd);
g_io_channel_set_encoding (channel, NULL, NULL);
- g_io_add_watch (channel, G_IO_IN, on_midi_input, &scherzo);
+ g_io_add_watch (channel, G_IO_IN, on_midi_input, &midi_out);
}
+ pipe (alsa_midi_fd);
+
+ alsa_midi_in.scherzo = &scherzo;
+ alsa_midi_in.fd = alsa_midi_fd[1];
+ g_thread_new ("scherzo-vmidi", listen_to_alsa_midi, &alsa_midi_in);
+
+ alsa_midi_out.scherzo = &scherzo;
+ alsa_midi_out.fd = alsa_midi_fd[0];
+ channel = g_io_channel_unix_new (alsa_midi_out.fd);
+ g_io_channel_set_encoding (channel, NULL, NULL);
+ g_io_add_watch (channel, G_IO_IN, on_midi_input, &alsa_midi_out);
+
scherzo.window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_default_size (GTK_WINDOW (scherzo.window), 1000, 600);
projects / scherzo / blobdiff