X-Git-Url: https://git.cworth.org/git?a=blobdiff_plain;f=scherzo.c;h=098008930e4d4d77b4dd21ec82ad40ca52d19554;hb=fc6b1da08cd8552050d2669363a85e405f19736d;hp=fbb23f0ed34da8efa4df50f9309258ca6c4840d7;hpb=66812a216aa78f33ddff8753dd62f8450ef3220a;p=scherzo diff --git a/scherzo.c b/scherzo.c index fbb23f0..0980089 100644 --- a/scherzo.c +++ b/scherzo.c @@ -17,11 +17,86 @@ */ #include +#include + +#include #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 + +typedef struct challenge +{ + bin_t *bin; + int item_index; + score_staff_t *staff; + score_note_t *note; + + int satisfied; + 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; + + 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; + score_pitch_accidental_t keyboard_accidental; + + int midi_fd; + snd_midi_event_t *snd_midi_event; + + mnemon_t mnemon; + challenge_t challenge; + + note_group_t notes_pressed; + note_group_t notes_pedaled; + + int pedal_pressed; +} scherzo_t; + +/* Forward declarations. */ +static score_note_t * +scherzo_press_note (scherzo_t *scherzo, score_pitch_t pitch, int octave); + +static void +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); + +static void +_score_challenge (scherzo_t *scherzo); + static int on_delete_event_quit (unused (GtkWidget *widget), unused (GdkEvent *event), @@ -35,15 +110,16 @@ on_delete_event_quit (unused (GtkWidget *widget), } static int -on_expose_event_draw (GtkWidget *widget, - unused (GdkEventExpose *event), +on_expose_event_draw (GtkWidget *widget, + unused (GdkEventExpose *expose), void * user_data) { - score_t *score = 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, staff_width; + int widget_width; gtk_widget_get_allocation (widget, &allocation); widget_width = allocation.width; @@ -54,9 +130,9 @@ on_expose_event_draw (GtkWidget *widget, cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); cairo_paint (cr); - /* Add some padding on the left/right */ - cairo_translate (cr, pad, pad); - + /* 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); @@ -64,35 +140,1158 @@ on_expose_event_draw (GtkWidget *widget, return TRUE; } +static int +on_key_press_event (GtkWidget *widget, + GdkEventKey *key, + void *user_data) +{ + scherzo_t *scherzo = user_data; + int octave; + /* Initialize to keep the compiler quiet. */ + score_pitch_name_t pitch_name = SCORE_PITCH_C; + 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: + 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_q: + case GDK_KEY_Q: + case GDK_KEY_Escape: + gtk_main_quit (); + return FALSE; + case GDK_KEY_c: + case GDK_KEY_C: + pitch_name = SCORE_PITCH_NAME_C; + break; + case GDK_KEY_d: + case GDK_KEY_D: + pitch_name = SCORE_PITCH_NAME_D; + break; + case GDK_KEY_e: + case GDK_KEY_E: + pitch_name = SCORE_PITCH_NAME_E; + break; + case GDK_KEY_f: + case GDK_KEY_F: + pitch_name = SCORE_PITCH_NAME_F; + break; + case GDK_KEY_g: + case GDK_KEY_G: + pitch_name = SCORE_PITCH_NAME_G; + break; + case GDK_KEY_a: + case GDK_KEY_A: + pitch_name = SCORE_PITCH_NAME_A; + break; + case GDK_KEY_b: + case GDK_KEY_B: + pitch_name = SCORE_PITCH_NAME_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; + case GDK_KEY_Up: + if (scherzo->keyboard_accidental < SCORE_PITCH_ACCIDENTAL_DOUBLE_SHARP) + scherzo->keyboard_accidental++; + break; + case GDK_KEY_Down: + if (scherzo->keyboard_accidental > SCORE_PITCH_ACCIDENTAL_DOUBLE_FLAT) + scherzo->keyboard_accidental--; + break; + } + + pitch = SCORE_PITCH (pitch_name, scherzo->keyboard_accidental); + + if ((key->keyval >= GDK_KEY_A && key->keyval <= GDK_KEY_G) || + (key->keyval >= GDK_KEY_a && key->keyval <= GDK_KEY_g)) + { + score_note_t *note; + + note = scherzo_press_note (scherzo, pitch, octave); + _judge_note (scherzo, note); + gtk_widget_queue_draw (scherzo->window); + + 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; + /* Initialize to keep the compiler quiet. */ + score_pitch_name_t pitch_name = SCORE_PITCH_NAME_C; + 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: + pitch_name = SCORE_PITCH_NAME_C; + break; + case GDK_KEY_d: + case GDK_KEY_D: + pitch_name = SCORE_PITCH_NAME_D; + break; + case GDK_KEY_e: + case GDK_KEY_E: + pitch_name = SCORE_PITCH_NAME_E; + break; + case GDK_KEY_f: + case GDK_KEY_F: + pitch_name = SCORE_PITCH_NAME_F; + break; + case GDK_KEY_g: + case GDK_KEY_G: + pitch_name = SCORE_PITCH_NAME_G; + break; + case GDK_KEY_a: + case GDK_KEY_A: + pitch_name = SCORE_PITCH_NAME_A; + break; + case GDK_KEY_b: + case GDK_KEY_B: + pitch_name = SCORE_PITCH_NAME_B; + break; + case GDK_KEY_space: + scherzo_release_pedal (scherzo); + break; + } + + pitch = SCORE_PITCH (pitch_name, scherzo->keyboard_accidental); + + if ((key->keyval >= GDK_KEY_A && key->keyval <= GDK_KEY_G) || + (key->keyval >= GDK_KEY_a && key->keyval <= GDK_KEY_g)) + { + scherzo_release_note (scherzo, pitch, octave); + _score_challenge (scherzo); + gtk_widget_queue_draw (scherzo->window); + + return TRUE; + } + + + /* Allow an unhandled event to propagate to other handlers. */ + 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, + int *octave) +{ + *octave = midi_note / 12 - 1; + + switch (midi_note % 12) + { + case 0: + *pitch = SCORE_PITCH_C; + break; + case 1: + *pitch = SCORE_PITCH_Cs; + break; + case 2: + *pitch = SCORE_PITCH_D; + break; + case 3: + *pitch = SCORE_PITCH_Ds; + break; + case 4: + *pitch = SCORE_PITCH_E; + break; + case 5: + *pitch = SCORE_PITCH_F; + break; + case 6: + *pitch = SCORE_PITCH_Fs; + break; + case 7: + *pitch = SCORE_PITCH_G; + break; + case 8: + *pitch = SCORE_PITCH_Gs; + break; + case 9: + *pitch = SCORE_PITCH_A; + break; + case 10: + *pitch = SCORE_PITCH_As; + break; + case 11: + *pitch = SCORE_PITCH_B; + break; + } +} + +/* 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_by_midi_pitch (const void *va, const void *vb) +{ + const analyzed_note_t *a = va, *b = vb; + + return a->midi_pitch - b->midi_pitch; +} + +static int +_compare_analyzed_note_by_relative_pitch (const void *va, const void *vb) +{ + const analyzed_note_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; + + /* Number of half steps from root to specified degree within a + * diatonic scaled. */ + switch (degree->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_note_t *notes, + int num_notes, + modified_degree_t *degrees, + int num_degrees, + int *inversion_ret, + score_pitch_t *root) +{ +#define MAX_DEGREES 4 + int relative_pitches[MAX_DEGREES]; + int inversion, max_inversions; + int i, root_index; + + assert (num_degrees <= MAX_DEGREES); + + if (num_notes != num_degrees) + return 0; + + max_inversions = num_degrees; + + /* We never spell simple intervals as inversions. */ + if (num_degrees == 2) + max_inversions = 1; + + for (inversion = 0; inversion < max_inversions; inversion++) { + 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_notes; i++) + if (notes[i].relative_pitch != relative_pitches[i]) + goto NEXT_INVERSION; + + root_index = (num_notes - inversion) % num_notes; + *root = notes[root_index].note->pitch; + + *inversion_ret = inversion; + + return 1; + + NEXT_INVERSION: + ; + } + + return 0; +} + +static const char * +_pitch_str (score_pitch_t pitch) +{ + switch (pitch) { + case SCORE_PITCH_Cff: + return "C𝄫"; + case SCORE_PITCH_Cf: + return "C♭"; + case SCORE_PITCH_C: + return "C"; + case SCORE_PITCH_Cs: + return "C♯"; + case SCORE_PITCH_Css: + return "C𝄪"; + case SCORE_PITCH_Dff: + return "D𝄫"; + case SCORE_PITCH_Df: + return "D♭"; + case SCORE_PITCH_D: + return "D"; + case SCORE_PITCH_Ds: + return "D♯"; + case SCORE_PITCH_Dss: + return "D𝄪"; + case SCORE_PITCH_Eff: + return "E𝄫"; + case SCORE_PITCH_Ef: + return "E♭"; + case SCORE_PITCH_E: + return "E"; + case SCORE_PITCH_Es: + return "E♯"; + case SCORE_PITCH_Ess: + return "E𝄪"; + case SCORE_PITCH_Fff: + return "F𝄫"; + case SCORE_PITCH_Ff: + return "F♭"; + case SCORE_PITCH_F: + return "F"; + case SCORE_PITCH_Fs: + return "F♯"; + case SCORE_PITCH_Fss: + return "F𝄪"; + case SCORE_PITCH_Gff: + return "G𝄫"; + case SCORE_PITCH_Gf: + return "G♭"; + case SCORE_PITCH_G: + return "G"; + case SCORE_PITCH_Gs: + return "G♯"; + case SCORE_PITCH_Gss: + return "G𝄪"; + case SCORE_PITCH_Aff: + return "A𝄫"; + case SCORE_PITCH_Af: + return "A♭"; + case SCORE_PITCH_A: + return "A"; + case SCORE_PITCH_As: + return "A♯"; + case SCORE_PITCH_Ass: + return "A𝄪"; + case SCORE_PITCH_Bff: + return "B𝄫"; + case SCORE_PITCH_Bf: + return "B♭"; + case SCORE_PITCH_B: + return "B"; + case SCORE_PITCH_Bs: + return "B♯"; + case SCORE_PITCH_Bss: + return "B𝄪"; + } + + fprintf (stderr, "Internal error: Unknown pitch %d\n", pitch); + exit (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, j, num_notes; + int bass_pitch, inversion; + score_pitch_t root; + 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 { modified_degree_t degrees[1]; const char *name; } octaves[] = { + { {{1, 0}}, " Octave"} + }; + + struct { modified_degree_t degrees[2]; const char *name; } intervals[] = { + { {{1, 0}, {2, -1}}, " Minor 2nd"}, + { {{1, 0}, {2, 0}}, " Major 2nd"}, + { {{1, 0}, {3, -1}}, " Minor 3rd"}, + { {{1, 0}, {3, 0}}, " Major 3rd"}, + { {{1, 0}, {4, 0}}, " Perfect 4th"}, + { {{1, 0}, {5, -1}}, " Diminished 5th"}, + { {{1, 0}, {5, 0}}, " Perfect 5th"}, + { {{1, 0}, {6, -1}}, " Minor 6th"}, + { {{1, 0}, {6, 0}}, " Major 6th"}, + { {{1, 0}, {7, -1}}, " Minor 7th"}, + { {{1, 0}, {7, 0}}, " Major 7th"} + }; + +/* 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 "" + + struct { modified_degree_t degrees[3]; const char *name; } triads[] = { + { {{1, 0}, {3, 0}, {5, +1}}, SUP "+" PUS }, + { {{1, 0}, {3, 0}, {5, 0}}, "" }, + { {{1, 0}, {3, -1}, {5, 0}}, "m" }, + { {{1, 0}, {3, -1}, {5, -1}}, "°" } + }; + + struct { modified_degree_t degrees[4]; const char *name; } sevenths[] = { + { {{1, 0}, {3, 0}, {5, +1}, {7, 0}}, SUP "+M7" PUS }, + { {{1, 0}, {3, 0}, {5, +1}, {7, -1}}, SUP "+7" PUS }, + { {{1, 0}, {3, 0}, {5, 0}, {7, 0}}, "M7" }, + { {{1, 0}, {3, 0}, {5, 0}, {7, -1}}, "7" }, + { {{1, 0}, {3, -1}, {5, 0}, {7, 0}}, "m" SUP "M7" PUS }, + { {{1, 0}, {3, -1}, {5, 0}, {7, -1}}, "m7" }, + { {{1, 0}, {3, -1}, {5, -1}, {7, 0}}, "°" SUP "M7" PUS }, + { {{1, 0}, {3, -1}, {5, -1}, {7, -1}}, "𝆩" SUP "7" PUS }, + { {{1, 0}, {3, -1}, {5, -1}, {7, -2}}, "°" SUP "7" PUS } + }; + + 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; + } + + /* First, sort by midi pitch to find the bass note. */ + qsort (notes, num_notes, sizeof (analyzed_note_t), + _compare_analyzed_note_by_midi_pitch); + + bass_pitch = notes[0].midi_pitch; + + /* With the bass note identified, we can find all relative pitches. */ + 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; + } + + /* Now, sort again by relative pitch. */ + qsort (notes, num_notes, sizeof (analyzed_note_t), + _compare_analyzed_note_by_relative_pitch); + + /* Finally, eliminate all duplicate notes. */ + for (i = 0; i < num_notes - 1; i++) { + if (notes[i+1].relative_pitch == notes[i].relative_pitch) { + j = i+1; + while (j < num_notes && + notes[j].relative_pitch == notes[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_notes - 1) { + memmove (¬es[i+1], ¬es[j+1], + (num_notes - j) * sizeof (analyzed_note_t)); + } + + num_notes -= (j - i); + } + } + + switch (num_notes) { + case 1: + for (i = 0; i < ARRAY_SIZE (octaves); i++) { + if (_chord_signature_matches (notes, num_notes, + octaves[i].degrees, 1, + &inversion, &root)) + { + chord_name = octaves[i].name; + break; + } + } + break; + case 2: + for (i = 0; i < ARRAY_SIZE (intervals); i++) { + if (_chord_signature_matches (notes, num_notes, + intervals[i].degrees, 2, + &inversion, &root)) + { + chord_name = intervals[i].name; + break; + } + } + break; + case 3: + for (i = 0; i < ARRAY_SIZE (triads); i++) { + if (_chord_signature_matches (notes, num_notes, + triads[i].degrees, 3, + &inversion, &root)) + { + chord_name = triads[i].name; + break; + } + } + break; + case 4: + for (i = 0; i < ARRAY_SIZE(sevenths); i++) { + if (_chord_signature_matches (notes, num_notes, + sevenths[i].degrees, 4, + &inversion, &root)) + { + chord_name = sevenths[i].name; + break; + } + } + break; + } + + if (chord_name) { + if (inversion) { + const char *inversion_str; + switch (inversion) { + case 1: + inversion_str = "1st inversion"; + break; + case 2: + inversion_str = "2nd inversion"; + break; + case 3: + inversion_str = "3rd inversion"; + break; + default: + fprintf (stderr, "Internal error: Unexpected inversion: %d\n", + inversion); + exit(1); + } + chord_name = talloc_asprintf (local, "%s%s %s", + _pitch_str (root), + chord_name, inversion_str); + } else { + chord_name = talloc_asprintf (local, "%s%s", + _pitch_str (root), + chord_name); + } + } else { + chord_name = talloc_strdup (local, "Unknown chord"); + } + + scherzo->chord = score_add_chord (scherzo->treble, chord_name); + +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) +{ + int i; + + /* Do nothing if note is already in group. */ + for (i = 0; i < group->num_notes; i++) { + if (group->notes[i]->pitch == note->pitch && + group->notes[i]->octave == note->octave) + { + return; + } + } + + 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_press_note (scherzo_t *scherzo, score_pitch_t pitch, int octave) +{ + score_staff_t *staff; + score_note_t *note; + int i; + + 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); + + note_group_add_note (&scherzo->notes_pressed, note); + + if (scherzo->pedal_pressed) + note_group_add_note (&scherzo->notes_pedaled, note); + + scherzo_analyze_chord (scherzo); + + return note; +} + +static void +scherzo_release_note (scherzo_t *scherzo, score_pitch_t pitch, int octave) +{ + score_note_t *note; + int i; + int found = 0; + + for (i = scherzo->notes_pressed.num_notes - 1; i >=0; i--) { + note = scherzo->notes_pressed.notes[i]; + if (note->pitch == pitch && note->octave == octave) { + 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_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_press_note (scherzo, pitch, octave); +} + +static void +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_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 +_select_challenge (scherzo_t *scherzo) +{ + category_t *category_unused; + bool_t introduced_unused; + item_t *item; + challenge_t *challenge = &scherzo->challenge; + score_pitch_t pitch; + int octave; + char *s; + + if (challenge->note) { + score_remove_note (challenge->note); + challenge->note = NULL; + } + + 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 = SCORE_PITCH_C; + break; + case 'D': + pitch = SCORE_PITCH_D; + break; + case 'E': + pitch = SCORE_PITCH_E; + break; + case 'F': + pitch = SCORE_PITCH_F; + break; + case 'G': + pitch = SCORE_PITCH_G; + break; + case 'A': + pitch = SCORE_PITCH_A; + break; + case 'B': + pitch = SCORE_PITCH_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->note = score_add_note (challenge->staff, pitch, octave, + SCORE_DURATION_WHOLE); + challenge->satisfied = 0; + challenge->mistaken = 0; +} + +/* Determine whether the user hit the correct note. */ +static void +_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) + { + challenge->satisfied = 1; + score_set_note_color_rgb (note, 18/256., 130/256., 28/256.); /* green */ + } + else + { + challenge->mistaken = 1; + score_set_note_color_rgb (note, 184/256., 4/256., 22/256.); /* red */ + } +} + +/* 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->note) + return; + + if (! challenge->satisfied) + return; + + mnemon_score_item (&scherzo->mnemon, challenge->bin, challenge->item_index, + ! challenge->mistaken); + + _select_challenge (scherzo); +} + +static int +on_midi_input (unused (GIOChannel *channel), + unused (GIOCondition condition), + void *user_data) +{ + unsigned char buf[MIDI_BUF_SIZE], *next; + scherzo_t *scherzo = user_data; + ssize_t remaining; + snd_seq_event_t event; + score_note_t *note; + int need_redraw = FALSE; + + remaining = read (scherzo->midi_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: + note = scherzo_press_note_midi (scherzo, event.data.note.note); + _judge_note (scherzo, note); + need_redraw = TRUE; + break; + case SND_SEQ_EVENT_NOTEOFF: + scherzo_release_note_midi (scherzo, event.data.note.note); + _score_challenge (scherzo); + need_redraw = TRUE; + 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; + } + } + + if (need_redraw) + gtk_widget_queue_draw (scherzo->window); + + /* Return TRUE to continue to get called in the future. */ + return TRUE; +} + int main (int argc, char *argv[]) { - GtkWidget *window; GtkWidget *drawing_area; - score_t score; + scherzo_t scherzo; + int err; + + srand (time (NULL)); gtk_init (&argc, &argv); - score_init (&score); + 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); - window = gtk_window_new (GTK_WINDOW_TOPLEVEL); + scherzo.chord = NULL; - gtk_window_set_default_size (GTK_WINDOW (window), 600, 400); + /* Default to octave 4 and natural for computer keyboard keypresses. */ + scherzo.keyboard_octave = 4; + scherzo.keyboard_accidental = SCORE_PITCH_ACCIDENTAL_NATURAL; - g_signal_connect (window, "delete-event", + 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-notes"); + + scherzo.challenge.note = NULL; +/* + _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" + 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); + g_io_channel_set_encoding (channel, NULL, NULL); + g_io_add_watch (channel, G_IO_IN, on_midi_input, &scherzo); + } + + 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), - &score); + &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; }