X-Git-Url: https://git.notmuchmail.org/git?a=blobdiff_plain;f=scherzo.c;h=9b0e2d9ced96bc43dfcf5f8c388d373549c8923f;hb=05713bff8bc084c401d58b1b9526d83d9a42b641;hp=5de614807aca4c8b1f30b2d3a979f0f9803d1cb0;hpb=1fe478f5aaa4f8ebff2a3f7771809c3d1aaa5ef4;p=scherzo

diff --git a/scherzo.c b/scherzo.c
index 5de6148..9b0e2d9 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
@@ -48,6 +50,7 @@ typedef struct scherzo
     int staff_height;
     score_staff_t *treble;
     score_staff_t *bass;
+    score_chord_t *chord;
     int midi_fd;
     snd_midi_event_t *snd_midi_event;
 
@@ -120,9 +123,14 @@ 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 = 4;
+
     switch (key->keyval) {
     case GDK_KEY_plus:
     case GDK_KEY_KP_Add:
@@ -196,9 +204,14 @@ 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 = 4;
+
     switch (key->keyval) {
     case GDK_KEY_c:
     case GDK_KEY_C:
@@ -245,6 +258,55 @@ 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,
@@ -293,13 +355,138 @@ _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++;
+	}
+    }
+
+    return 1;
+}
+
+static void
+scherzo_analyze_chord (scherzo_t *scherzo)
+{
+    void *local = talloc_new (NULL);
+    analyzed_note_t *notes;
+    unsigned i, num_notes = scherzo->num_notes_pressed;
+    int bass_pitch;
+    const char *chord_name = NULL;
+
+    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" }
+    };
+
+    if (scherzo->chord) {
+	score_remove_chord (scherzo->chord);
+	scherzo->chord = NULL;
+    }
+
+    if (num_notes == 0)
+	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 = scherzo->notes_pressed[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;
+    }
+
+    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 < num_sevenths; i++) {
+	if (_chord_signature_matches (notes, num_notes, seventh[i].pitches, 4))
+	    chord_name = seventh[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 score_note_t *
 scherzo_add_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
+	staff = scherzo->treble;
+
+    /* Do nothing if this note is already pressed. */
+    for (i = 0; i < scherzo->num_notes_pressed; i++) {
+	if (scherzo->notes_pressed[i]->pitch == pitch &&
+	    scherzo->notes_pressed[i]->octave == octave)
+	{
+	    return scherzo->notes_pressed[i];
+	}
+    }
 
     note = score_add_note (staff, pitch, octave, SCORE_DURATION_WHOLE);
 
@@ -315,6 +502,8 @@ scherzo_add_note (scherzo_t *scherzo, score_pitch_t pitch, int octave)
 
     scherzo->notes_pressed[scherzo->num_notes_pressed - 1] = note;
 
+    scherzo_analyze_chord (scherzo);
+
     return note;
 }
 
@@ -338,6 +527,8 @@ scherzo_remove_note (scherzo_t *scherzo, score_pitch_t pitch, int octave)
 	    i--;
 	}
     }
+
+    scherzo_analyze_chord (scherzo);
 }
 
 static score_note_t *
@@ -448,6 +639,11 @@ _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 +664,9 @@ _score_challenge (scherzo_t *scherzo)
 {
     challenge_t *challenge = &scherzo->challenge;
 
+    if (! challenge->note)
+	return;
+
     if (! challenge->satisfied)
 	return;
 
@@ -556,6 +755,8 @@ 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.chord = NULL;
+
     scherzo.num_notes_pressed = 0;
     scherzo.notes_pressed = NULL;
 
@@ -564,7 +765,9 @@ main (int argc, char *argv[])
     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) {