X-Git-Url: https://git.cworth.org/git?p=scherzo;a=blobdiff_plain;f=scherzo.c;h=7288d5fdbe7efb98b7b4c87879b6549cbbf8f23d;hp=77db9bb74b481ff09e48175dc0e4ebfbc7e5e0ab;hb=HEAD;hpb=4fc25bc641a5360245de29aac56e9450415f38e4 diff --git a/scherzo.c b/scherzo.c index 77db9bb..7288d5f 100644 --- a/scherzo.c +++ b/scherzo.c @@ -17,9 +17,87 @@ */ #include +#include + +#include + +#include "score.h" +#include "mnemon.h" + +#define ARRAY_SIZE(arr) ((int) (sizeof(arr) / sizeof(arr[0]))) #define unused(foo) foo __attribute__((unused)) +#define MIDI_BUF_SIZE 4096 + +typedef struct challenge +{ + int active; + bin_t *bin; + int item_index; + score_staff_t *staff; + pitch_t pitch; + + int satisfied; + int mistaken; +} challenge_t; + +typedef struct pitch_group +{ + void *ctx; + pitch_t *pitches; + int size; + int num_pitches; +} pitch_group_t; + +typedef struct scherzo +{ + void *ctx; + + GtkWidget *window; + score_t *score; + int staff_height; + + score_staff_t *treble; + score_staff_t *bass; + score_chord_t *chord; + + /* The word "keyboard" here is referring to a "computer + * keyboard". Any "piano keyboard" key knows its own octave and + * accidental already. */ + int keyboard_octave; + snd_midi_event_t *snd_midi_event; + + mnemon_t mnemon; + challenge_t challenge; + + pitch_group_t notes_pressed; + pitch_group_t notes_pedaled; + + int pedal_pressed; + + scherzo_key_t key; +} scherzo_t; + +/* Forward declarations. */ +static void +scherzo_press_note (scherzo_t *scherzo, pitch_t pitch); + +static void +scherzo_release_note (scherzo_t *scherzo, pitch_t pitch); + +static void +scherzo_press_pedal (scherzo_t *scherzo); + +static void +scherzo_release_pedal (scherzo_t *scherzo); + +static void +pitch_group_remove_pitches (pitch_group_t *group); + +static void +scherzo_update_notes_and_chord (scherzo_t *scherzo); + static int on_delete_event_quit (unused (GtkWidget *widget), unused (GdkEvent *event), @@ -33,51 +111,1281 @@ on_delete_event_quit (unused (GtkWidget *widget), } static int -on_expose_event_draw (GtkWidget *widget, - unused (GdkEventExpose *event), - unused (gpointer user_data)) +on_expose_event_draw (GtkWidget *widget, + unused (GdkEventExpose *expose), + void * user_data) { + scherzo_t *scherzo = user_data; + score_t *score = scherzo->score; cairo_t *cr; GtkAllocation allocation; + static const int pad = 10; + int widget_width; gtk_widget_get_allocation (widget, &allocation); + widget_width = allocation.width; cr = gdk_cairo_create (widget->window); - /* Paint in medium sea green */ - cairo_set_source_rgb (cr, 60/255.0, 179/255.0, 113/255.0); - + /* White background */ + cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); cairo_paint (cr); + + /* Add some padding on the sides and top */ + cairo_translate (cr, pad, scherzo->staff_height); + score_set_staff_height (score, scherzo->staff_height); + score_set_width (score, widget_width - 2 * pad); + + score_draw (score, cr); return TRUE; } +static int +on_key_press_event (GtkWidget *widget, + GdkEventKey *key, + void *user_data) +{ + scherzo_t *scherzo = user_data; + int octave; + pitch_t pitch = PITCH_NOT_A_PITCH; + + if (scherzo->challenge.active) + octave = PITCH_OCTAVE (scherzo->challenge.pitch); + else + octave = scherzo->keyboard_octave; + + switch (key->keyval) { + case GDK_KEY_plus: + case GDK_KEY_KP_Add: + case GDK_KEY_equal: + case GDK_KEY_KP_Equal: + scherzo->staff_height += 4; + gtk_widget_queue_draw (widget); + return TRUE; + break; + case GDK_KEY_minus: + case GDK_KEY_KP_Subtract: + scherzo->staff_height -= 4; + gtk_widget_queue_draw (widget); + return TRUE; + break; + case GDK_KEY_Escape: + gtk_main_quit (); + return FALSE; + /* Map a piano keyboard onto the computer keyboard with white keys + * along the home row, (piano C on computer A, up to next octave + * higher C on computer K). Black keys are in the expected + * positions, (C# is W, D# is E, etc.). + */ + case GDK_KEY_a: + case GDK_KEY_A: + pitch = PITCH_LITERAL (C, NATURAL, octave); + break; + case GDK_KEY_s: + case GDK_KEY_S: + pitch = PITCH_LITERAL (D, NATURAL, octave); + break; + case GDK_KEY_d: + case GDK_KEY_D: + pitch = PITCH_LITERAL (E, NATURAL, octave); + break; + case GDK_KEY_f: + case GDK_KEY_F: + pitch = PITCH_LITERAL (F, NATURAL, octave); + break; + case GDK_KEY_g: + case GDK_KEY_G: + pitch = PITCH_LITERAL (G, NATURAL, octave); + break; + case GDK_KEY_h: + case GDK_KEY_H: + pitch = PITCH_LITERAL (A, NATURAL, octave); + break; + case GDK_KEY_j: + case GDK_KEY_J: + pitch = PITCH_LITERAL (B, NATURAL, octave); + break; + case GDK_KEY_k: + case GDK_KEY_K: + pitch = PITCH_LITERAL (C, NATURAL, octave + 1); + break; + case GDK_KEY_l: + case GDK_KEY_L: + pitch = PITCH_LITERAL (D, NATURAL, octave + 1); + break; + case GDK_KEY_semicolon: + case GDK_KEY_colon: + pitch = PITCH_LITERAL (E, NATURAL, octave + 1); + break; + case GDK_KEY_apostrophe: + case GDK_KEY_quotedbl: + pitch = PITCH_LITERAL (F, NATURAL, octave + 1); + break; + case GDK_KEY_w: + case GDK_KEY_W: + pitch = PITCH_LITERAL (C, SHARP, octave); + break; + case GDK_KEY_e: + case GDK_KEY_E: + pitch = PITCH_LITERAL (D, SHARP, octave); + break; + case GDK_KEY_t: + case GDK_KEY_T: + pitch = PITCH_LITERAL (F, SHARP, octave); + break; + case GDK_KEY_y: + case GDK_KEY_Y: + pitch = PITCH_LITERAL (G, SHARP, octave); + break; + case GDK_KEY_u: + case GDK_KEY_U: + pitch = PITCH_LITERAL (A, SHARP, octave); + break; + case GDK_KEY_o: + case GDK_KEY_O: + pitch = PITCH_LITERAL (C, SHARP, octave + 1); + break; + case GDK_KEY_p: + case GDK_KEY_P: + pitch = PITCH_LITERAL (D, SHARP, octave + 1); + break; + case GDK_KEY_bracketright: + case GDK_KEY_braceright: + pitch = PITCH_LITERAL (F, SHARP, octave + 1); + 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; + case GDK_KEY_Return: + /* Clear all notes when Return is pressed. */ + pitch_group_remove_pitches (&scherzo->notes_pressed); + pitch_group_remove_pitches (&scherzo->notes_pedaled); + scherzo_update_notes_and_chord (scherzo); + break; + } + + if (pitch != PITCH_NOT_A_PITCH) + { + scherzo_press_note (scherzo, pitch); + + return TRUE; + } + + /* Allow an unhandled event to propagate to other handlers. */ + return FALSE; +} + +static int +on_key_release_event (unused (GtkWidget *widget), + GdkEventKey *key, + void *user_data) +{ + scherzo_t *scherzo = user_data; + int octave; + pitch_t pitch = PITCH_NOT_A_PITCH; + + if (scherzo->challenge.active) + octave = PITCH_OCTAVE (scherzo->challenge.pitch); + else + octave = scherzo->keyboard_octave; + + switch (key->keyval) { + case GDK_KEY_a: + case GDK_KEY_A: + pitch = PITCH_LITERAL (C, NATURAL, octave); + break; + case GDK_KEY_s: + case GDK_KEY_S: + pitch = PITCH_LITERAL (D, NATURAL, octave); + break; + case GDK_KEY_d: + case GDK_KEY_D: + pitch = PITCH_LITERAL (E, NATURAL, octave); + break; + case GDK_KEY_f: + case GDK_KEY_F: + pitch = PITCH_LITERAL (F, NATURAL, octave); + break; + case GDK_KEY_g: + case GDK_KEY_G: + pitch = PITCH_LITERAL (G, NATURAL, octave); + break; + case GDK_KEY_h: + case GDK_KEY_H: + pitch = PITCH_LITERAL (A, NATURAL, octave); + break; + case GDK_KEY_j: + case GDK_KEY_J: + pitch = PITCH_LITERAL (B, NATURAL, octave); + break; + case GDK_KEY_k: + case GDK_KEY_K: + pitch = PITCH_LITERAL (C, NATURAL, octave + 1); + break; + case GDK_KEY_l: + case GDK_KEY_L: + pitch = PITCH_LITERAL (D, NATURAL, octave + 1); + break; + case GDK_KEY_semicolon: + case GDK_KEY_colon: + pitch = PITCH_LITERAL (E, NATURAL, octave + 1); + break; + case GDK_KEY_apostrophe: + case GDK_KEY_quotedbl: + pitch = PITCH_LITERAL (F, NATURAL, octave + 1); + break; + case GDK_KEY_w: + case GDK_KEY_W: + pitch = PITCH_LITERAL (C, SHARP, octave); + break; + case GDK_KEY_e: + case GDK_KEY_E: + pitch = PITCH_LITERAL (D, SHARP, octave); + break; + case GDK_KEY_t: + case GDK_KEY_T: + pitch = PITCH_LITERAL (F, SHARP, octave); + break; + case GDK_KEY_y: + case GDK_KEY_Y: + pitch = PITCH_LITERAL (G, SHARP, octave); + break; + case GDK_KEY_u: + case GDK_KEY_U: + pitch = PITCH_LITERAL (A, SHARP, octave); + break; + case GDK_KEY_o: + case GDK_KEY_O: + pitch = PITCH_LITERAL (C, SHARP, octave + 1); + break; + case GDK_KEY_p: + case GDK_KEY_P: + pitch = PITCH_LITERAL (D, SHARP, octave + 1); + break; + case GDK_KEY_bracketright: + case GDK_KEY_braceright: + pitch = PITCH_LITERAL (F, SHARP, octave + 1); + break; + case GDK_KEY_space: + scherzo_release_pedal (scherzo); + break; + } + + if (pitch != PITCH_NOT_A_PITCH) + { + scherzo_release_note (scherzo, pitch); + + return TRUE; + } + + + /* Allow an unhandled event to propagate to other handlers. */ + return FALSE; +} + +/* Determine a chord name (if any) from the current notes pressed */ + +typedef struct analyzed_pitch { + /* Original note being analzyed. */ + pitch_t pitch; + + /* Absolute pitch (expressed as midi number). */ + int midi_pitch; + + /* Pitch relative to bass note. */ + int relative_pitch; +} analyzed_pitch_t; + +static int +_compare_analyzed_pitch_by_midi_pitch (const void *va, const void *vb) +{ + const analyzed_pitch_t *a = va, *b = vb; + + return a->midi_pitch - b->midi_pitch; +} + +static int +_compare_analyzed_pitch_by_relative_pitch (const void *va, const void *vb) +{ + const analyzed_pitch_t *a = va, *b = vb; + + return a->relative_pitch - b->relative_pitch; +} + +typedef struct modified_degree +{ + int degree; + int modification; +} modified_degree_t; + +static int +_modified_degree_to_half_steps (const modified_degree_t *degree) +{ + int half_steps; + int scale_degree = degree->degree; + + /* Restrict to actual degrees within a scale. */ + if (scale_degree > 7) + scale_degree = (scale_degree % 8) + 1; + + /* Number of half steps from root to specified degree within a + * diatonic scale. */ + switch (scale_degree) { + case 1: + half_steps = 0; + break; + case 2: + half_steps = 2; + break; + case 3: + half_steps = 4; + break; + case 4: + half_steps = 5; + break; + case 5: + half_steps = 7; + break; + case 6: + half_steps = 9; + break; + case 7: + half_steps = 11; + break; + default: + fprintf (stderr, "Internal: Invalid degree %d\n", degree->degree); + exit (1); + break; + } + + return half_steps + degree->modification; +} + +static int +_chord_signature_matches (analyzed_pitch_t *pitches, + int num_pitches, + modified_degree_t *degrees, + int num_degrees, + int inversion, + pitch_t *root) +{ +#define MAX_DEGREES 6 + int relative_pitches[MAX_DEGREES]; + int i, root_index; + + assert (num_degrees <= MAX_DEGREES); + + if (num_pitches != num_degrees) + return 0; + + if (inversion >= num_degrees) + return 0; + + /* We never spell simple intervals as inversions. */ + if (num_degrees == 2 && inversion > 0) + return 0; + + for (i = 0; i < num_degrees; i++) { + /* The num_degrees is in the addition just to ensure all + * inputs to the modulus operator remain positive. */ + int index = (i + num_degrees - inversion) % num_degrees; + + /* Again, adding a 12 to keep things positive. */ + relative_pitches[index] = + (12 + + _modified_degree_to_half_steps (°rees[i]) - + _modified_degree_to_half_steps (°rees[inversion])) % 12; + + } + + for (i = 0; i < num_pitches; i++) + if (pitches[i].relative_pitch != relative_pitches[i]) + return 0; + + root_index = (num_pitches - inversion) % num_pitches; + *root = pitches[root_index].pitch; + + return 1; +} + +typedef struct chord_signature +{ + int num_degrees; + modified_degree_t degrees[MAX_DEGREES]; + const char *name; +} chord_signature_t; + +/* XXX: The superscript rise value should be relative to the current + * font size. Best would be for pango to support this. See: + * + * https://bugzilla.gnome.org/show_bug.cgi?id=708780 + * + * For now, these are emipirically-derived values that look reasonable + * at the default size that score.c is using to draw the staff. If the + * user scales the staff up or down then these will look wrong. + */ + +#define SUP "" +#define PUS "" + +chord_signature_t signatures[] = { + /* Octave */ + { 1, {{1, 0}}, "P8" }, + + /* Intervals */ + { 2, {{1, 0}, {2, -1}}, "m2" }, + { 2, {{1, 0}, {2, 0}}, "M2" }, + { 2, {{1, 0}, {3, -1}}, "m3" }, + { 2, {{1, 0}, {3, 0}}, "M3" }, + { 2, {{1, 0}, {4, 0}}, "P4" }, + { 2, {{1, 0}, {5, -1}}, "Tri-tone" }, + { 2, {{1, 0}, {5, 0}}, "P5" }, + { 2, {{1, 0}, {6, -1}}, "m6" }, + { 2, {{1, 0}, {6, 0}}, "M6" }, + { 2, {{1, 0}, {7, -1}}, "m7" }, + { 2, {{1, 0}, {7, 0}}, "M7" }, + + /* Triads */ + { 3, {{1, 0}, {4, 0}, {5, 0}}, "sus" }, + { 3, {{1, 0}, {3, 0}, {5, +1}}, SUP "+" PUS }, + { 3, {{1, 0}, {3, 0}, {5, 0}}, "" }, + { 3, {{1, 0}, {3, -1}, {5, 0}}, "m" }, + { 3, {{1, 0}, {3, -1}, {5, -1}}, "°" }, + { 3, {{1, 0}, {2, 0}, {5, 0}}, "msus2" }, + + /* Seventh chords with no 3rd */ + { 3, {{1, 0}, {5, +1}, {7, 0}}, SUP "+M7" PUS }, + { 3, {{1, 0}, {5, +1}, {7, -1}}, SUP "+7" PUS }, + { 3, {{1, 0}, {5, 0}, {7, 0}}, "M7" }, + { 3, {{1, 0}, {5, 0}, {7, -1}}, "7" }, + { 3, {{1, 0}, {5, -1}, {7, -1}}, "7♭5" }, + + /* Seventh chords with no 5th */ + { 3, {{1, 0}, {4, 0}, {7, 0}}, "M7sus" }, + { 3, {{1, 0}, {4, 0}, {7, -1}}, "7sus" }, + { 3, {{1, 0}, {3, 0}, {7, 0}}, "M7" }, + { 3, {{1, 0}, {3, 0}, {7, -1}}, "7" }, + { 3, {{1, 0}, {3, -1}, {7, 0}}, "m" SUP "M7" PUS }, + { 3, {{1, 0}, {3, -1}, {7, -1}}, "m7" }, + { 3, {{1, 0}, {2, 0}, {7, 0}}, "m" SUP "M7" PUS "sus2" }, + { 3, {{1, 0}, {2, 0}, {7, -1}}, "m7sus2" }, + + /* Sixth chords */ + { 4, {{1, 0}, {4, 0}, {5, 0}, {6, 0}}, "6sus" }, + { 4, {{1, 0}, {3, 0}, {5, 0}, {6, 0}}, "6" }, /* Ambiguous with m7 */ + { 4, {{1, 0}, {3, -1}, {5, 0}, {6, 0}}, "m6" }, + { 4, {{1, 0}, {2, 0}, {5, 0}, {6, 0}}, "m6sus2" }, + + /* Seventh chords */ + { 4, {{1, 0}, {4, 0}, {5, +1}, {7, 0}}, SUP "+M7" PUS "sus" }, + { 4, {{1, 0}, {4, 0}, {5, +1}, {7, -1}}, SUP "+7" PUS "sus" }, + { 4, {{1, 0}, {4, 0}, {5, 0}, {7, 0}}, "M7sus" }, + { 4, {{1, 0}, {4, 0}, {5, 0}, {7, -1}}, "7sus" }, + { 4, {{1, 0}, {4, 0}, {5, -1}, {7, -1}}, "7♭5sus" }, + { 4, {{1, 0}, {3, 0}, {5, +1}, {7, 0}}, SUP "+M7" PUS }, + { 4, {{1, 0}, {3, 0}, {5, +1}, {7, -1}}, SUP "+7" PUS }, + { 4, {{1, 0}, {3, 0}, {5, 0}, {7, 0}}, "M7" }, + { 4, {{1, 0}, {3, 0}, {5, 0}, {7, -1}}, "7" }, + { 4, {{1, 0}, {3, 0}, {5, -1}, {7, -1}}, "7♭5" }, + { 4, {{1, 0}, {3, -1}, {5, 0}, {7, 0}}, "m" SUP "M7" PUS }, + { 4, {{1, 0}, {3, -1}, {5, 0}, {7, -1}}, "m7" }, + { 4, {{1, 0}, {3, -1}, {5, -1}, {7, 0}}, "°" SUP "M7" PUS }, + { 4, {{1, 0}, {3, -1}, {5, -1}, {7, -1}}, "𝆩" SUP "7" PUS }, + { 4, {{1, 0}, {3, -1}, {5, -1}, {7, -2}}, "°" SUP "7" PUS }, + { 4, {{1, 0}, {2, 0}, {5, 0}, {7, 0}}, "m" SUP "M7" PUS "sus2" }, + { 4, {{1, 0}, {2, 0}, {5, 0}, {7, -1}}, "m7sus2" }, + { 4, {{1, 0}, {2, 0}, {5, -1}, {7, 0}}, "°" SUP "M7" PUS "sus2" }, + { 4, {{1, 0}, {2, 0}, {5, -1}, {7, -1}}, "𝆩" SUP "7" PUS "sus2" }, + { 4, {{1, 0}, {2, 0}, {5, -1}, {7, -2}}, "°" SUP "7" PUS "sus2" }, /* Ambiguous with 7 */ + + /* The sorting for chords with degree higher than 9 is funny + * to keep the array in degree order after reducing each + * degree to an actual scale degree, (9 -> 2, 11 -> 4, 13 -> + * 6) */ + + /* Ninth chords voiced with no 5th */ + { 4, {{1, 0}, {9, 0}, {4, 0}, {7, 0}}, "M9sus" }, + { 4, {{1, 0}, {9, 0}, {4, 0}, {7, -1}}, "9sus" }, + { 4, {{1, 0}, {9, 0}, {3, 0}, {7, 0}}, "M9" }, + { 4, {{1, 0}, {9, 0}, {3, 0}, {7, -1}}, "9" }, + { 4, {{1, 0}, {9, 0}, {3, -1}, {7, 0}}, "m" SUP "M9" PUS }, + { 4, {{1, 0}, {9, 0}, {3, -1}, {7, -1}}, "m9" }, + { 4, {{1, 0}, {9, -1}, {3, -1}, {7, -1}}, "m♭9" }, + { 4, {{1, 0}, {9, 0}, {3, -1}, {6, 0}}, "m6/9" }, + { 4, {{1, 0}, {9, -1}, {3, -1}, {6, 0}}, "m6/♭9" }, + + /* Sixth plus 9 */ + { 5, {{1, 0}, {9, 0}, {3, 0}, {5, 0}, {6, 0}}, "6/9" }, + { 5, {{1, 0}, {9, 0}, {3, -1}, {5, 0}, {6, 0}}, "m6/9" }, + { 5, {{1, 0}, {9, -1}, {3, -1}, {5, 0}, {6, 0}}, "m6/♭9" }, + + /* Seventh plus altered 9 */ + { 5, {{1, 0}, {9, +1}, {3, 0}, {5, 0}, {7, -1}}, "7♯9" }, + { 5, {{1, 0}, {9, -1}, {3, 0}, {5, 0}, {7, -1}}, "7♭9" }, + { 5, {{1, 0}, {9, +1}, {3, 0}, {5, -1}, {7, -1}}, "7♭5♯9" }, + { 5, {{1, 0}, {9, -1}, {3, 0}, {5, -1}, {7, -1}}, "7♭5♭9" }, + + /* Ninth chords */ + { 5, {{1, 0}, {9, 0}, {4, 0}, {5, +1}, {7, 0}}, SUP "+M9" PUS "sus" }, + { 5, {{1, 0}, {9, 0}, {4, 0}, {5, +1}, {7, -1}}, SUP "+9" PUS "sus" }, + { 5, {{1, 0}, {9, 0}, {4, 0}, {5, 0}, {7, 0}}, "M9sus" }, + { 5, {{1, 0}, {9, 0}, {4, 0}, {5, 0}, {7, -1}}, "9sus" }, + { 5, {{1, 0}, {9, 0}, {3, 0}, {5, +1}, {7, 0}}, SUP "+M9" PUS }, + { 5, {{1, 0}, {9, 0}, {3, 0}, {5, +1}, {7, -1}}, SUP "+9" PUS }, + { 5, {{1, 0}, {9, 0}, {3, 0}, {5, 0}, {7, 0}}, "M9" }, + { 5, {{1, 0}, {9, 0}, {3, 0}, {5, 0}, {7, -1}}, "9" }, + { 5, {{1, 0}, {9, 0}, {3, -1}, {5, 0}, {7, 0}}, "m" SUP "M9" PUS }, + { 5, {{1, 0}, {9, 0}, {3, -1}, {5, 0}, {7, -1}}, "m9" }, + { 5, {{1, 0}, {9, -1}, {3, -1}, {5, 0}, {7, -1}}, "m♭9" }, + { 5, {{1, 0}, {9, 0}, {3, 0}, {5, -1}, {7, 0}}, "M9" SUP "♭5" PUS }, + { 5, {{1, 0}, {9, 0}, {3, 0}, {5, -1}, {7, -1}}, "9" SUP "♭5" PUS }, + { 5, {{1, 0}, {9, 0}, {3, -1}, {5, -1}, {7, 0}}, "m" SUP "M9♭5" PUS }, + { 5, {{1, 0}, {9, 0}, {3, -1}, {5, -1}, {7, -1}}, "𝆩" SUP "9" PUS }, + { 5, {{1, 0}, {9, -1}, {3, -1}, {5, -1}, {7, -1}}, "𝆩" SUP "♭9" PUS }, + { 5, {{1, 0}, {9, 0}, {3, -1}, {5, -1}, {7, -2}}, "°" SUP "9" PUS }, + { 5, {{1, 0}, {9, -1}, {3, -1}, {5, -1}, {7, -2}}, "°" SUP "♭9" PUS }, + + /* Eleventh chords */ + { 6, {{1, 0}, {9, 0}, {3, 0}, {11, 0}, {5, +1}, {7, 0}}, SUP "+M11" PUS }, + { 6, {{1, 0}, {9, 0}, {3, 0}, {11, 0}, {5, +1}, {7, -1}}, SUP "+11" PUS }, + { 6, {{1, 0}, {9, 0}, {3, 0}, {11, 0}, {5, 0}, {7, 0}}, "M11" }, + { 6, {{1, 0}, {9, 0}, {3, 0}, {11, 0}, {5, 0}, {7, -1}}, "11" }, + { 6, {{1, 0}, {9, 0}, {3, -1}, {11, 0}, {5, 0}, {7, 0}}, "m" SUP "M11" PUS }, + { 6, {{1, 0}, {9, 0}, {3, -1}, {11, 0}, {5, 0}, {7, -1}}, "m11" }, + { 6, {{1, 0}, {9, -1}, {3, -1}, {11, 0}, {5, -1}, {7, -1}}, "𝆩" SUP "11" PUS }, + { 6, {{1, 0}, {9, -1}, {3, -1}, {11, -1}, {5, -1}, {7, -2}}, "°" SUP "11" PUS } +}; + +static void +_spell_chord_by_signature (pitch_group_t *chord, + chord_signature_t *signature, + pitch_t root) +{ + int i, degree, note_half_steps, degree_half_steps; + + for (i = 0; i < chord->num_pitches; i++) { + note_half_steps = pitch_from_root_in_half_steps (chord->pitches[i], + root); + for (degree = 0; degree < signature->num_degrees; degree++) { + degree_half_steps = _modified_degree_to_half_steps (&signature->degrees[degree]); + if (note_half_steps == degree_half_steps) { + chord->pitches[i] = pitch_spell_as_degree (chord->pitches[i], + root, + signature->degrees[degree].degree); + break; + } + } + if (note_half_steps != degree_half_steps) { + fprintf (stderr, "Internal error: Chord and degree mis-match\n"); + exit (1); + } + } +} + +static void +_analyze_chord (pitch_group_t *chord, + chord_signature_t **signature_ret, + pitch_t **root_ret) +{ + void *local = talloc_new (NULL); + analyzed_pitch_t *pitches; + int i, j, num_pitches; + int bass_pitch, inversion; + pitch_t root; + chord_signature_t *match = NULL; + + /* Default to no-match for any early return */ + *signature_ret = NULL; + *root_ret = NULL; + + num_pitches = chord->num_pitches; + + if (chord->num_pitches <= 1) + goto DONE; + + pitches = talloc_array (local, analyzed_pitch_t, num_pitches); + if (pitches == NULL) + goto DONE; + + for (i = 0; i < num_pitches; i++) { + pitch_t pitch = chord->pitches[i]; + pitches[i].pitch = pitch; + pitches[i].midi_pitch = pitch_to_midi (pitch); + /* Relative pitch will be filled in after sorting. */ + pitches[i].relative_pitch = 0; + } + + /* First, sort by midi pitch to find the bass note. */ + qsort (pitches, num_pitches, sizeof (analyzed_pitch_t), + _compare_analyzed_pitch_by_midi_pitch); + + bass_pitch = pitches[0].midi_pitch; + + /* With the bass note identified, we can find all relative pitches. */ + for (i = 0; i < num_pitches; i++) { + pitches[i].relative_pitch = pitches[i].midi_pitch - bass_pitch; + while (pitches[i].relative_pitch >= 12) + pitches[i].relative_pitch -= 12; + } + + /* Now, sort again by relative pitch. */ + qsort (pitches, num_pitches, sizeof (analyzed_pitch_t), + _compare_analyzed_pitch_by_relative_pitch); + + /* Finally, eliminate all duplicate notes. */ + for (i = 0; i < num_pitches - 1; i++) { + if (pitches[i+1].relative_pitch == pitches[i].relative_pitch) { + j = i+1; + while (j < num_pitches && + pitches[j].relative_pitch == pitches[i].relative_pitch) + { + j++; + } + /* The loop incremented j one past the last + * duplicate. Decrement so that it points to the + * last duplicate (and is guaranteed to not exceed + * the array bounds).*/ + j--; + + if (j < num_pitches - 1) { + memmove (&pitches[i+1], &pitches[j+1], + (num_pitches - j) * sizeof (analyzed_pitch_t)); + } + + num_pitches -= (j - i); + } + } + + for (inversion = 0; inversion < 4; inversion++) { + for (i = 0; i < ARRAY_SIZE (signatures); i++) { + if (_chord_signature_matches (pitches, num_pitches, + signatures[i].degrees, + signatures[i].num_degrees, + inversion, &root)) + { + match = &signatures[i]; + goto HAVE_MATCH; + } + } + } +HAVE_MATCH: + + if (match) { + *signature_ret = match; + for (i = 0; i < chord->num_pitches; i++) { + if (chord->pitches[i] == root) { + *root_ret = &chord->pitches[i]; + break; + } + } + } + +DONE: + talloc_free (local); +} + +static void +pitch_group_init (void *ctx, pitch_group_t *group) +{ + group->ctx = ctx; + group->pitches = NULL; + group->size = 0; + group->num_pitches = 0; +} + +static void +pitch_group_add_pitch (pitch_group_t *group, pitch_t pitch) +{ + int i; + + /* Do nothing if pitch is already in group. */ + for (i = 0; i < group->num_pitches; i++) + if (group->pitches[i] == pitch) + return; + + group->num_pitches++; + + if (group->num_pitches > group->size) { + group->size++; + group->pitches = talloc_realloc (group->ctx, group->pitches, + pitch_t, group->size); + + if (group->pitches == NULL) { + fprintf (stderr, "Out of memory.\n"); + exit (1); + } + } + + group->pitches[group->num_pitches - 1] = pitch; +} + +static void +pitch_group_remove_pitch_at (pitch_group_t *group, int i) +{ + if (i > group->num_pitches) { + fprintf (stderr, "Internal error: Cannot remove pitch %d from group with only %d %s\n", + i, group->num_pitches, + group->num_pitches == 1 ? "pitch" : "pitches"); + exit (1); + } + + if (i < group->num_pitches - 1) { + memmove (group->pitches + i, group->pitches + i + 1, + (group->num_pitches - 1 - i) * sizeof (pitch_t)); + } + + group->num_pitches--; +} + +/* Remove a 'pitch' from 'group', (including any enharmonic pitch) + * See also: pitch_group_remove_pitch + */ +static void +pitch_group_remove_pitch_enharmonic (pitch_group_t *group, pitch_t pitch) +{ + int i; + + for (i = 0; i < group->num_pitches; i++) + if (pitch_enharmonic_to (group->pitches[i], pitch)) + pitch_group_remove_pitch_at (group, i); +} + +/* Remove an exactly-matching pitch from 'group' + * See also: pitch_group_remove_pitch_enharmonic + * +static void +pitch_group_remove_pitch (pitch_group_t *group, pitch_t pitch) +{ + int i; + + for (i = 0; i < group->num_pitches; i++) + if (group->pitches[i] == pitch) + pitch_group_remove_pitch_at (group, i); +} +*/ + +/* Remove all pitches from a pitch_group_t */ +static void +pitch_group_remove_pitches (pitch_group_t *group) +{ + talloc_free (group->pitches); + pitch_group_init (group->ctx, group); +} + +static void +scherzo_update_notes_and_chord (scherzo_t *scherzo) +{ + void *local = talloc_new (NULL); + pitch_group_t *chord; + chord_signature_t *signature; + char *chord_name = NULL; + pitch_t *root; + int i; + + /* Remove all notes/chords from score, then add current notes. */ + score_remove_notes (scherzo->score); + score_remove_chords (scherzo->score); + + if (scherzo->pedal_pressed) + chord = &scherzo->notes_pedaled; + else + chord = &scherzo->notes_pressed; + + _analyze_chord (chord, &signature, &root); + + if (signature) { + /* Don't print root pitch for octaves and inversions, + * (since a pitch name alone looks like a major triad) */ + if (signature->num_degrees < 3) { + /* In fact, don't print anything for octaves and + * inversions for now. It leads to a bit of flashing when + * playing chords. + * + * FIXME: What I'd like to have here is a small timeout, + * such that names only appear once an interval has been + * held for at least 100 ms or so. With that, it would be + * nice to display the interval names once again. + * + chord_name = talloc_strdup (local, signature->name); + */ + } else { + _spell_chord_by_signature (&scherzo->notes_pressed, + signature, *root); + _spell_chord_by_signature (&scherzo->notes_pedaled, + signature, *root); + + chord_name = talloc_asprintf (local, "%s%s", + pitch_string (*root), + signature->name); + } + } else if (chord->num_pitches > 2) { + chord_name = talloc_strdup (local, "?"); + } + + if (chord_name) + scherzo->chord = score_add_chord (scherzo->treble, chord_name); + + for (i = 0; i < scherzo->notes_pressed.num_pitches; i++) + { + score_add_note (scherzo->score, scherzo->notes_pressed.pitches[i], + SCORE_DURATION_WHOLE); + } + + for (i = 0; i < scherzo->notes_pedaled.num_pitches; i++) + { + score_add_note (scherzo->score, scherzo->notes_pedaled.pitches[i], + SCORE_DURATION_WHOLE); + } + + gtk_widget_queue_draw (scherzo->window); + + 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) + return; + + pitch_group_add_pitch (&scherzo->notes_pressed, pitch); + + if (scherzo->pedal_pressed) + pitch_group_add_pitch (&scherzo->notes_pedaled, pitch); + + scherzo_update_notes_and_chord (scherzo); +} + +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); +} + +static void +scherzo_press_note_midi (scherzo_t *scherzo, unsigned char midi_note) +{ + scherzo_press_note (scherzo, pitch_from_midi (midi_note)); +} + +static void +scherzo_release_note_midi (scherzo_t *scherzo, unsigned char midi_note) +{ + scherzo_release_note (scherzo, pitch_from_midi (midi_note)); +} + +static void +scherzo_press_pedal (scherzo_t *scherzo) +{ + int i; + + if (scherzo->pedal_pressed) + return; + + scherzo->pedal_pressed = 1; + + /* Copy all pressed notes to pedaled notes */ + for (i = 0; i < scherzo->notes_pressed.num_pitches; i++) + pitch_group_add_pitch (&scherzo->notes_pedaled, scherzo->notes_pressed.pitches[i]); +} + +static void +scherzo_release_pedal (scherzo_t *scherzo) +{ + int i; + + if (! scherzo->pedal_pressed) + return; + + /* Remove all previously pedaled notes. */ + for (i = scherzo->notes_pedaled.num_pitches - 1; i >=0; i--) + pitch_group_remove_pitch_at (&scherzo->notes_pedaled, i); + + scherzo->pedal_pressed = 0; + + scherzo_update_notes_and_chord (scherzo); +} + +#if 0 +static void +_select_challenge (scherzo_t *scherzo) +{ + category_t *category_unused; + bool_t introduced_unused; + item_t *item; + challenge_t *challenge = &scherzo->challenge; + pitch_name_t pitch_name; + int octave; + char *s; + + mnemon_select_item (&scherzo->mnemon, + &challenge->bin, + &challenge->item_index, + &category_unused, + &introduced_unused); + + item = challenge->bin->items[challenge->item_index]; + + s = item->challenge; + if (strncmp (s, "treble:", 7) == 0) { + s += 7; + challenge->staff = scherzo->treble; + } else if (strncmp (s, "bass:", 5) == 0) { + s += 5; + challenge->staff = scherzo->bass; + } else { + fprintf (stderr, + "Malformed staff name: %s (expected 'treble:' or 'bass:')\n", + s); + exit (1); + } + + switch (*s) { + case 'C': + pitch_name = PITCH_NAME_C; + break; + case 'D': + pitch_name = PITCH_NAME_D; + break; + case 'E': + pitch_name = PITCH_NAME_E; + break; + case 'F': + pitch_name = PITCH_NAME_F; + break; + case 'G': + pitch_name = PITCH_NAME_G; + break; + case 'A': + pitch_name = PITCH_NAME_A; + break; + case 'B': + pitch_name = PITCH_NAME_B; + break; + default: + fprintf (stderr, "Malformed pitch name: %s (expected 'A' - 'G')\n", s); + exit (1); + } + s++; + + if (*s < '0' || *s > '9') { + fprintf (stderr, "Malformed octave number: %s (expected '0' - '9')\n", s); + exit (1); + } + + octave = *s - '0'; + + challenge->pitch = PITCH (pitch_name, PITCH_ACCIDENTAL_NATURAL, octave); + + challenge->active = 1; + challenge->satisfied = 0; + challenge->mistaken = 0; +} + +/* Determine whether the user hit the correct note. */ +static void +_judge_pitch (scherzo_t *scherzo, pitch_t pitch) +{ + challenge_t *challenge = &scherzo->challenge; + + if (! challenge->active) + return; + + if (pitch == challenge->pitch) + challenge->satisfied = 1; + else + challenge->mistaken = 1; +} + +/* If the user got the right note (eventually), then score it in + * mnemon and show the next note. */ +static void +_score_challenge (scherzo_t *scherzo) +{ + challenge_t *challenge = &scherzo->challenge; + + if (! challenge->active) + return; + + if (! challenge->satisfied) + return; + + mnemon_score_item (&scherzo->mnemon, challenge->bin, challenge->item_index, + ! challenge->mistaken); + + _select_challenge (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 = closure->scherzo; + int fd = closure->fd; + ssize_t remaining; + snd_seq_event_t event; + + remaining = read (fd, buf, MIDI_BUF_SIZE); + + next = buf; + while (remaining) { + long consumed; + + consumed = snd_midi_event_encode (scherzo->snd_midi_event, + next, remaining, &event); + + remaining -= consumed; + next += consumed; + + switch (event.type) { + case SND_SEQ_EVENT_NONE: + /* Incomplete event. Nothing to do. */ + break; + case SND_SEQ_EVENT_NOTEON: + scherzo_press_note_midi (scherzo, event.data.note.note); + break; + case SND_SEQ_EVENT_NOTEOFF: + scherzo_release_note_midi (scherzo, event.data.note.note); + break; + case SND_SEQ_EVENT_CLOCK: + /* Ignore for now as my piano sends a constant stream of these. */ + break; + 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); + break; + } + } + + /* Return TRUE to continue to get called in the future. */ + 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 *window; 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)); gtk_init (&argc, &argv); - window = gtk_window_new (GTK_WINDOW_TOPLEVEL); + scherzo.ctx = talloc_new (NULL); + + scherzo.score = score_create (scherzo.ctx); + scherzo.staff_height = 100; + score_set_staff_height (scherzo.score, scherzo.staff_height); + + score_add_brace (scherzo.score, 2); + scherzo.treble = score_add_staff (scherzo.score, SCORE_CLEF_G); + scherzo.bass = score_add_staff (scherzo.score, SCORE_CLEF_F); + + scherzo.chord = NULL; - gtk_window_set_default_size (GTK_WINDOW (window), 600, 400); + /* Default to octave 4 for computer keyboard keypresses. */ + scherzo.keyboard_octave = 4; - g_signal_connect (window, "delete-event", + pitch_group_init (scherzo.ctx, &scherzo.notes_pressed); + pitch_group_init (scherzo.ctx, &scherzo.notes_pedaled); + + scherzo.pedal_pressed = 0; + + /* Default to key of C Major, naturally. */ + scherzo_set_key (&scherzo, PITCH_CLASS_LITERAL (C, NATURAL)); + + mnemon_init (&scherzo.mnemon); + /* XXX: Should create a default file if one cannot be loaded. */ + mnemon_load_category (&scherzo.mnemon, "scherzo-notes"); + + scherzo.challenge.active = 0; +/* + _select_challenge (&scherzo); +*/ + + err = snd_midi_event_new (MIDI_BUF_SIZE, &scherzo.snd_midi_event); + if (err) { + fprintf (stderr, "Out of memory.\n"); + return 1; + } + +#define MIDI_DEVICE "/dev/midi1" + + 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, &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); + + g_signal_connect (scherzo.window, "delete-event", G_CALLBACK (on_delete_event_quit), NULL); drawing_area = gtk_drawing_area_new (); - gtk_container_add (GTK_CONTAINER (window), drawing_area); + gtk_container_add (GTK_CONTAINER (scherzo.window), drawing_area); g_signal_connect (drawing_area, "expose-event", - G_CALLBACK (on_expose_event_draw), NULL); + G_CALLBACK (on_expose_event_draw), + &scherzo); + g_signal_connect (scherzo.window, "key-press-event", + G_CALLBACK (on_key_press_event), + &scherzo); + + g_signal_connect (scherzo.window, "key-release-event", + G_CALLBACK (on_key_release_event), + &scherzo); - gtk_widget_show_all (window); + gtk_widget_show_all (scherzo.window); gtk_main (); + mnemon_save (&scherzo.mnemon); + + snd_midi_event_free (scherzo.snd_midi_event); + + talloc_free (scherzo.ctx); + return 0; }