X-Git-Url: https://git.cworth.org/git?a=blobdiff_plain;f=scherzo.c;h=a13196e5b802563f7f8906e7cd42157e5c7ed7c0;hb=936c8b69ec6177d82b1905ed555dc8fbe1f32283;hp=8d6ca9af7bd8cb49bdee15ed2ada4c321c4d5271;hpb=590c3f4f3b3ab138c67439d71be13f82446b69d4;p=scherzo

diff --git a/scherzo.c b/scherzo.c
index 8d6ca9a..a13196e 100644
--- a/scherzo.c
+++ b/scherzo.c
@@ -24,6 +24,8 @@
 #include "score.h"
 #include "mnemon.h"
 
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0]))
+
 #define unused(foo) foo __attribute__((unused))
 
 #define MIDI_BUF_SIZE 4096
@@ -39,6 +41,14 @@ typedef struct challenge
     int mistaken;
 } challenge_t;
 
+typedef struct note_group
+{
+    void *ctx;
+    score_note_t **notes;
+    int size;
+    int num_notes;
+} note_group_t;
+
 typedef struct scherzo
 {
     void *ctx;
@@ -48,22 +58,36 @@ typedef struct scherzo
     int staff_height;
     score_staff_t *treble;
     score_staff_t *bass;
+    score_chord_t *chord;
+
+    /* This is for a "computer keyboard". Any "piano keyboard" key
+     * knows its own octave. */
+    int keyboard_octave;
+
     int midi_fd;
     snd_midi_event_t *snd_midi_event;
 
     mnemon_t mnemon;
     challenge_t challenge;
 
-    int num_notes_pressed;
-    score_note_t **notes_pressed;
+    note_group_t notes_pressed;
+    note_group_t notes_pedaled;
+
+    int pedal_pressed;
 } scherzo_t;
 
 /* Forward declarations. */
 static score_note_t *
-scherzo_add_note (scherzo_t *scherzo, score_pitch_t pitch, int octave);
+scherzo_press_note (scherzo_t *scherzo, score_pitch_t pitch, int octave);
 
 static void
-scherzo_remove_note (scherzo_t *scherzo, score_pitch_t pitch, int octave);
+scherzo_release_note (scherzo_t *scherzo, score_pitch_t pitch, int octave);
+
+static void
+scherzo_press_pedal (scherzo_t *scherzo);
+
+static void
+scherzo_release_pedal (scherzo_t *scherzo);
 
 static void
 _judge_note (scherzo_t *scherzo, score_note_t *note);
@@ -120,9 +144,14 @@ on_key_press_event (GtkWidget *widget,
 		    void *user_data)
 {
     scherzo_t *scherzo = user_data;
-    int octave = scherzo->challenge.note->octave;
+    int octave;
     score_pitch_t pitch;
 
+    if (scherzo->challenge.note)
+	octave = scherzo->challenge.note->octave;
+    else
+	octave = scherzo->keyboard_octave;
+
     switch (key->keyval) {
     case GDK_KEY_plus:
     case GDK_KEY_KP_Add:
@@ -171,6 +200,20 @@ on_key_press_event (GtkWidget *widget,
     case GDK_KEY_B:
 	pitch = SCORE_PITCH_B;
 	break;
+    case GDK_KEY_0:
+    case GDK_KEY_1:
+    case GDK_KEY_2:
+    case GDK_KEY_3:
+    case GDK_KEY_4:
+    case GDK_KEY_5:
+    case GDK_KEY_6:
+    case GDK_KEY_7:
+    case GDK_KEY_8:
+	scherzo->keyboard_octave = key->keyval - GDK_KEY_0;
+	break;
+    case GDK_KEY_space:
+	scherzo_press_pedal (scherzo);
+	break;
     }
 
     if ((key->keyval >= GDK_KEY_A && key->keyval <= GDK_KEY_G) ||
@@ -178,7 +221,7 @@ on_key_press_event (GtkWidget *widget,
     {
 	score_note_t *note;
 
-	note = scherzo_add_note (scherzo, pitch, octave);
+	note = scherzo_press_note (scherzo, pitch, octave);
 	_judge_note (scherzo, note);
 	gtk_widget_queue_draw (scherzo->window);
 
@@ -196,9 +239,14 @@ on_key_release_event (unused (GtkWidget *widget),
 		      void *user_data)
 {
     scherzo_t *scherzo = user_data;
-    int octave = scherzo->challenge.note->octave;
+    int octave;
     score_pitch_t pitch;
 
+    if (scherzo->challenge.note)
+	octave = scherzo->challenge.note->octave;
+    else
+	octave = scherzo->keyboard_octave;
+
     switch (key->keyval) {
     case GDK_KEY_c:
     case GDK_KEY_C:
@@ -228,12 +276,15 @@ on_key_release_event (unused (GtkWidget *widget),
     case GDK_KEY_B:
 	pitch = SCORE_PITCH_B;
 	break;
+    case GDK_KEY_space:
+	scherzo_release_pedal (scherzo);
+	break;
     }
 
     if ((key->keyval >= GDK_KEY_A && key->keyval <= GDK_KEY_G) ||
 	(key->keyval >= GDK_KEY_a && key->keyval <= GDK_KEY_g))
     {
-	scherzo_remove_note (scherzo, pitch, octave);
+	scherzo_release_note (scherzo, pitch, octave);
 	_score_challenge (scherzo);
 	gtk_widget_queue_draw (scherzo->window);
 
@@ -245,6 +296,55 @@ on_key_release_event (unused (GtkWidget *widget),
     return FALSE;
 }
 
+static unsigned char
+_score_pitch_and_octave_to_midi (score_pitch_t pitch,
+				 int octave)
+{
+    unsigned char midi_note = 12 * (octave + 1);
+
+    switch (SCORE_PITCH_NAME (pitch)) {
+    case SCORE_PITCH_NAME_C:
+	break;
+    case SCORE_PITCH_NAME_D:
+	midi_note += 2;
+	break;
+    case SCORE_PITCH_NAME_E:
+	midi_note += 4;
+	break;
+    case SCORE_PITCH_NAME_F:
+	midi_note += 5;
+	break;
+    case SCORE_PITCH_NAME_G:
+	midi_note += 7;
+	break;
+    case SCORE_PITCH_NAME_A:
+	midi_note += 9;
+	break;
+    case SCORE_PITCH_NAME_B:
+	midi_note += 11;
+	break;
+    }
+
+    switch (SCORE_PITCH_ACCIDENTAL (pitch)) {
+    case SCORE_PITCH_ACCIDENTAL_DOUBLE_FLAT:
+	midi_note -= 2;
+	break;
+    case SCORE_PITCH_ACCIDENTAL_FLAT:
+	midi_note -= 1;
+	break;
+    case SCORE_PITCH_ACCIDENTAL_NATURAL:
+	break;
+    case SCORE_PITCH_ACCIDENTAL_SHARP:
+	midi_note += 1;
+	break;
+    case SCORE_PITCH_ACCIDENTAL_DOUBLE_SHARP:
+	midi_note += 2;
+	break;
+    }
+
+    return midi_note;
+}
+
 static void
 _midi_to_score_pitch_and_octave (unsigned char midi_note,
 				 score_pitch_t *pitch,
@@ -293,74 +393,324 @@ _midi_to_score_pitch_and_octave (unsigned char midi_note,
     }
 }
 
+/* Determine a chord name (if any) from the current notes pressed */
+
+typedef struct analyzed_note {
+    /* Original note being analzyed. */
+    score_note_t *note;
+
+    /* Absolute pitch (expressed as midi number). */
+    int midi_pitch;
+
+    /* Pitch relative to bass note. */
+    int relative_pitch;
+} analyzed_note_t;
+
+static int
+_compare_analyzed_note (const void *va, const void *vb)
+{
+    const analyzed_note_t *a = va, *b = vb;
+
+    return a->midi_pitch - b->midi_pitch;
+}
+
+static int
+_chord_signature_matches (analyzed_note_t *notes,
+			  int num_notes,
+			  int *signature_pitches,
+			  int num_signature_pitches)
+{
+    int n, s;
+
+    for (n = 0, s = 0; s < num_signature_pitches; s++) {
+	if (n >= num_notes)
+	    return 0;
+	if (notes[n].relative_pitch != signature_pitches[s])
+	    return 0;
+	n++;
+	/* Skip repeated notes in chord being tested. */
+	while (n < num_notes &&
+	       notes[n].relative_pitch == signature_pitches[s])
+	{
+	    n++;
+	}
+    }
+
+    /* If there are fewer notes in the signature than in the chord,
+     * then there is no match. */
+    if (n < num_notes)
+	    return 0;
+
+    return 1;
+}
+
+static void
+scherzo_analyze_chord (scherzo_t *scherzo)
+{
+    void *local = talloc_new (NULL);
+    analyzed_note_t *notes;
+    note_group_t *note_group;
+    unsigned i, num_notes;
+    int bass_pitch;
+    const char *chord_name = NULL;
+
+    if (scherzo->pedal_pressed)
+	note_group = &scherzo->notes_pedaled;
+    else
+	note_group = &scherzo->notes_pressed;
+
+    num_notes = note_group->num_notes;
+
+    struct { int pitches[2]; const char *name; } intervals[] = {
+	{ {0, 1}, "Minor 2nd"},
+	{ {0, 2}, "Major 2nd"},
+	{ {0, 3}, "Minor 3rd"},
+	{ {0, 4}, "Major 3rd"},
+	{ {0, 5}, "Perfect 4th"},
+	{ {0, 6}, "Diminished 5th/Augmented 4th"},
+	{ {0, 7}, "Perfect 5th"},
+	{ {0, 8}, "Minor 6th"},
+	{ {0, 9}, "Major 6th"},
+	{ {0, 10}, "Minor 7th"},
+	{ {0, 11}, "Major 7th"}
+    };
+
+    struct { int pitches[3]; const char *name; } triads[] = {
+	{ {0, 4, 8}, "Augmented triad" },
+	{ {0, 4, 7}, "Major triad" },
+	{ {0, 3, 7}, "Minor triad" },
+	{ {0, 3, 6}, "Diminished triad" }
+    };
+
+    struct { int pitches[4]; const char *name; } sevenths[] = {
+	{ {0, 4, 8, 11}, "Augmented/major 7" },
+	{ {0, 4, 7, 11}, "Major 7" },
+	{ {0, 4, 7, 10}, "Dominant 7" },
+	{ {0, 3, 7, 11}, "Minor/major 7" },
+	{ {0, 3, 7, 10}, "Minor 7" },
+	{ {0, 3, 6, 10}, "Half-diminished 7" },
+	{ {0, 3, 6, 9},  "Diminished 7" },
+	{ {0, 4, 8, 10}, "Augmented 7" },
+	{ {0, 3, 6, 11}, "Diminished/major 7" },
+    };
+
+    if (scherzo->chord) {
+	score_remove_chord (scherzo->chord);
+	scherzo->chord = NULL;
+    }
+
+    if (num_notes <= 1)
+	goto DONE;
+
+    notes = talloc_array (local, analyzed_note_t, num_notes);
+    if (notes == NULL)
+	goto DONE;
+
+    for (i = 0; i < num_notes; i++) {
+	score_note_t *note = note_group->notes[i];
+	notes[i].note = note;
+	notes[i].midi_pitch = _score_pitch_and_octave_to_midi (note->pitch,
+							       note->octave);
+	/* Relative pitch will be filled in after sorting. */
+	notes[i].relative_pitch = 0;
+    }
+
+    qsort (notes, num_notes, sizeof (analyzed_note_t), _compare_analyzed_note);
+    
+    bass_pitch = notes[0].midi_pitch;
+
+    for (i = 0; i < num_notes; i++) {
+	notes[i].relative_pitch = notes[i].midi_pitch - bass_pitch;
+	while (notes[i].relative_pitch > 12)
+	    notes[i].relative_pitch -= 12;
+    }
+
+    for (i = 0; i < ARRAY_SIZE (intervals); i++) {
+	if (_chord_signature_matches (notes, num_notes, intervals[i].pitches, 2))
+	    chord_name = intervals[i].name;
+    }
+
+    for (i = 0; i < ARRAY_SIZE (triads); i++) {
+	if (_chord_signature_matches (notes, num_notes, triads[i].pitches, 3))
+	    chord_name = triads[i].name;
+    }
+
+    for (i = 0; i < ARRAY_SIZE(sevenths); i++) {
+	if (_chord_signature_matches (notes, num_notes, sevenths[i].pitches, 4))
+	    chord_name = sevenths[i].name;
+    }
+
+    if (chord_name)
+	scherzo->chord = score_add_chord (scherzo->treble, chord_name);
+    else
+	scherzo->chord = score_add_chord (scherzo->treble, "Unknown or not a chord");
+
+DONE:
+    talloc_free (local);
+}
+
+static void
+note_group_init (void *ctx, note_group_t *group)
+{
+    group->ctx = ctx;
+    group->notes = NULL;
+    group->size = 0;
+    group->num_notes = 0;
+}
+
+static void
+note_group_add_note (note_group_t *group, score_note_t *note)
+{
+    group->num_notes++;
+
+    if (group->num_notes > group->size) {
+	group->size++;
+	group->notes = talloc_realloc (group->ctx, group->notes,
+				       score_note_t*, group->size);
+
+	if (group->notes == NULL) {
+	    fprintf (stderr, "Out of memory.\n");
+	    exit (1);
+	}
+    }
+
+    group->notes[group->num_notes - 1] = note;
+}
+
+static void
+note_group_remove_note_at (note_group_t *group, int i)
+{
+    if (i >= group->num_notes) {
+	fprintf (stderr, "Internal error: No note to remove at index %d\n", i);
+	exit (1);
+    }
+
+    if (i < group->num_notes - 1) {
+	memmove (group->notes + i, group->notes + i + 1,
+		 (group->num_notes - 1 - i) * sizeof (score_note_t*));
+    }
+    group->num_notes--;
+}
+
 static score_note_t *
-scherzo_add_note (scherzo_t *scherzo, score_pitch_t pitch, int octave)
+scherzo_press_note (scherzo_t *scherzo, score_pitch_t pitch, int octave)
 {
     score_staff_t *staff;
     score_note_t *note;
+    int i;
 
-    staff = scherzo->challenge.staff;
+    if (scherzo->challenge.note) {
+	staff = scherzo->challenge.staff;
+    } else if (octave >= 4) {
+	staff = scherzo->treble;
+    } else {
+	staff = scherzo->bass;
+    }
+
+    /* Do nothing if this note is already pressed. */
+    for (i = 0; i < scherzo->notes_pressed.num_notes; i++) {
+	if (scherzo->notes_pressed.notes[i]->pitch == pitch &&
+	    scherzo->notes_pressed.notes[i]->octave == octave)
+	{
+	    return scherzo->notes_pressed.notes[i];
+	}
+    }
 
     note = score_add_note (staff, pitch, octave, SCORE_DURATION_WHOLE);
 
-    scherzo->num_notes_pressed++;
-    scherzo->notes_pressed = talloc_realloc (scherzo->ctx,
-					     scherzo->notes_pressed,
-					     score_note_t*,
-					     scherzo->num_notes_pressed);
-    if (scherzo->notes_pressed == NULL) {
-	fprintf (stderr, "Out of memory.\n");
-	exit (1);
-    }
+    note_group_add_note (&scherzo->notes_pressed, note);
 
-    scherzo->notes_pressed[scherzo->num_notes_pressed - 1] = note;
+    if (scherzo->pedal_pressed)
+	note_group_add_note (&scherzo->notes_pedaled, note);
+
+    scherzo_analyze_chord (scherzo);
 
     return note;
 }
 
-
 static void
-scherzo_remove_note (scherzo_t *scherzo, score_pitch_t pitch, int octave)
+scherzo_release_note (scherzo_t *scherzo, score_pitch_t pitch, int octave)
 {
     score_note_t *note;
     int i;
+    int found = 0;
 
-    for (i = 0; i < scherzo->num_notes_pressed; i++) {
-	note = scherzo->notes_pressed[i];
+    for (i = scherzo->notes_pressed.num_notes - 1; i >=0; i--) {
+	note = scherzo->notes_pressed.notes[i];
 	if (note->pitch == pitch && note->octave == octave) {
-	    score_remove_note (note);
-	    if (i < scherzo->num_notes_pressed - 1) {
-		memmove (scherzo->notes_pressed + i,
-			 scherzo->notes_pressed + i + 1,
-			 (scherzo->num_notes_pressed - 1 - i) * sizeof (score_note_t*));
-	    }
-	    scherzo->num_notes_pressed--;
-	    i--;
+	    found = 1;
+	    if (! scherzo->pedal_pressed)
+		score_remove_note (note);
+	    note_group_remove_note_at (&scherzo->notes_pressed, i);
 	}
     }
+
+    if (found == 0) {
+	fprintf (stderr, "Internal error: Failed to find note to release.\n");
+    }
+
+    scherzo_analyze_chord (scherzo);
 }
 
 static score_note_t *
-scherzo_add_note_midi (scherzo_t *scherzo, unsigned char midi_note)
+scherzo_press_note_midi (scherzo_t *scherzo, unsigned char midi_note)
 {
     score_pitch_t pitch;
     int octave;
 
     _midi_to_score_pitch_and_octave (midi_note, &pitch, &octave);
 
-    return scherzo_add_note (scherzo, pitch, octave);
+    return scherzo_press_note (scherzo, pitch, octave);
 }
 
-
 static void
-scherzo_remove_note_midi (scherzo_t *scherzo, unsigned char midi_note)
+scherzo_release_note_midi (scherzo_t *scherzo, unsigned char midi_note)
 {
     score_pitch_t pitch;
     int octave;
  
     _midi_to_score_pitch_and_octave (midi_note, &pitch, &octave);
 
-    scherzo_remove_note (scherzo, pitch, octave);
+    scherzo_release_note (scherzo, pitch, octave);
+}
+
+static void
+scherzo_press_pedal (scherzo_t *scherzo)
+{
+    int i;
+
+    scherzo->pedal_pressed = 1;
+
+    /* Copy all pressed notes to pedaled notes */
+    for (i = 0; i < scherzo->notes_pressed.num_notes; i++)
+	note_group_add_note (&scherzo->notes_pedaled, scherzo->notes_pressed.notes[i]);
+}
+
+static void
+scherzo_release_pedal (scherzo_t *scherzo)
+{
+    score_note_t *note, *new_note;
+    int i;
+
+    /* Make new notes in score for all pressed notes. */
+    for (i = 0; i < scherzo->notes_pressed.num_notes; i++) {
+	note = scherzo->notes_pressed.notes[i];
+	new_note = score_add_note (note->staff, note->pitch, note->octave, note->duration);
+	scherzo->notes_pressed.notes[i] = new_note;
+    }
+
+    /* Then remove all previously pedaled notes from the score. */
+    for (i = scherzo->notes_pedaled.num_notes - 1; i >=0; i--) {
+	note = scherzo->notes_pedaled.notes[i];
+	score_remove_note (note);
+	note_group_remove_note_at (&scherzo->notes_pedaled, i);
+    }
+
+    scherzo->pedal_pressed = 0;
+
+    scherzo_analyze_chord (scherzo);
+
+    gtk_widget_queue_draw (scherzo->window);
 }
 
 void
@@ -448,6 +798,11 @@ _judge_note (scherzo_t *scherzo, score_note_t *note)
 {
     challenge_t *challenge = &scherzo->challenge;
 
+    if (! scherzo->challenge.note) {
+	score_set_note_color_rgb (note, 0.0, 0.0, 0.0); /* black */
+	return;
+    }
+
     if (note->pitch == challenge->note->pitch &&
 	note->octave == challenge->note->octave)
     {
@@ -468,6 +823,9 @@ _score_challenge (scherzo_t *scherzo)
 {
     challenge_t *challenge = &scherzo->challenge;
 
+    if (! challenge->note)
+	return;
+
     if (! challenge->satisfied)
 	return;
 
@@ -506,12 +864,12 @@ on_midi_input (unused (GIOChannel *channel),
 	    /* Incomplete event. Nothing to do. */
 	    break;
 	case SND_SEQ_EVENT_NOTEON:
-	    note = scherzo_add_note_midi (scherzo, event.data.note.note);
+	    note = scherzo_press_note_midi (scherzo, event.data.note.note);
 	    _judge_note (scherzo, note);
 	    need_redraw = TRUE;
 	    break;
 	case SND_SEQ_EVENT_NOTEOFF:
-	    scherzo_remove_note_midi (scherzo, event.data.note.note);
+	    scherzo_release_note_midi (scherzo, event.data.note.note);
 	    _score_challenge (scherzo);
 	    need_redraw = TRUE;
 	    break;
@@ -521,6 +879,19 @@ on_midi_input (unused (GIOChannel *channel),
 	case SND_SEQ_EVENT_SENSING:
 	    /* Ignore for now as my piano sends a constant stream of these. */
 	    break;
+	case SND_SEQ_EVENT_CONTROLLER:
+	    /* XXX: My piano gives me 64 for the sustain pedal, is
+	     * that universal? */
+	    if (event.data.control.param == 64) {
+		if (event.data.control.value == 0)
+		    scherzo_release_pedal (scherzo);
+		else
+		    scherzo_press_pedal (scherzo);
+	    } else {
+		fprintf (stderr, "Fixme: Unhandled MIDI Control event (param=%d, value=%d)\n",
+			 event.data.control.param, event.data.control.value);
+	    }
+	    break;
 	default:
 	    fprintf (stderr, "Fixme: Do not yet know how to handle MIDI event %d\n",
 		     event.type);
@@ -556,15 +927,24 @@ main (int argc, char *argv[])
     scherzo.treble = score_add_staff (scherzo.score, SCORE_CLEF_G);
     scherzo.bass = score_add_staff (scherzo.score, SCORE_CLEF_F);
 
-    scherzo.num_notes_pressed = 0;
-    scherzo.notes_pressed = NULL;
+    scherzo.chord = NULL;
+
+    /* Default to octave 4 for computer keyboard keypresses. */
+    scherzo.keyboard_octave = 4;
+
+    note_group_init (scherzo.ctx, &scherzo.notes_pressed);
+    note_group_init (scherzo.ctx, &scherzo.notes_pedaled);
+
+    scherzo.pedal_pressed = 0;
 
     mnemon_init (&scherzo.mnemon);
     /* XXX: Should create a default file if one cannot be loaded. */
-    mnemon_load_category (&scherzo.mnemon, "scherzo");
+    mnemon_load_category (&scherzo.mnemon, "scherzo-notes");
 
     scherzo.challenge.note = NULL;
+/*
     _select_challenge (&scherzo);
+*/
 
     err = snd_midi_event_new (MIDI_BUF_SIZE, &scherzo.snd_midi_event);
     if (err) {