X-Git-Url: https://git.cworth.org/git?p=scherzo;a=blobdiff_plain;f=scherzo.c;h=491489839c8cba69345f41d19a0f1879bbf1f97a;hp=c49584c2465e2c153f3f6690fa2df3045e829751;hb=0e2eb38551790f6c5f920cf99da6b486e29dd0e8;hpb=0261a9e510c766d7c8c69a8d66783bf050683c9f diff --git a/scherzo.c b/scherzo.c index c49584c..4914898 100644 --- a/scherzo.c +++ b/scherzo.c @@ -17,17 +17,63 @@ */ #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 scherzo { + void *ctx; + + GtkWidget *window; score_t *score; 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; + + mnemon_t mnemon; + challenge_t challenge; + + int num_notes_pressed; + score_note_t **notes_pressed; } scherzo_t; +/* Forward declarations. */ +static score_note_t * +scherzo_add_note (scherzo_t *scherzo, score_pitch_t pitch, int octave); + +static void +scherzo_remove_note (scherzo_t *scherzo, score_pitch_t pitch, int octave); + +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), @@ -41,8 +87,8 @@ 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) { scherzo_t *scherzo = user_data; @@ -61,8 +107,9 @@ 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); @@ -70,37 +117,742 @@ 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; + 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: + 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 = SCORE_PITCH_C; + break; + case GDK_KEY_d: + case GDK_KEY_D: + pitch = SCORE_PITCH_D; + break; + case GDK_KEY_e: + case GDK_KEY_E: + pitch = SCORE_PITCH_E; + break; + case GDK_KEY_f: + case GDK_KEY_F: + pitch = SCORE_PITCH_F; + break; + case GDK_KEY_g: + case GDK_KEY_G: + pitch = SCORE_PITCH_G; + break; + case GDK_KEY_a: + case GDK_KEY_A: + pitch = SCORE_PITCH_A; + break; + case GDK_KEY_b: + case GDK_KEY_B: + pitch = SCORE_PITCH_B; + break; + } + + 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_add_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; + 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: + pitch = SCORE_PITCH_C; + break; + case GDK_KEY_d: + case GDK_KEY_D: + pitch = SCORE_PITCH_D; + break; + case GDK_KEY_e: + case GDK_KEY_E: + pitch = SCORE_PITCH_E; + break; + case GDK_KEY_f: + case GDK_KEY_F: + pitch = SCORE_PITCH_F; + break; + case GDK_KEY_g: + case GDK_KEY_G: + pitch = SCORE_PITCH_G; + break; + case GDK_KEY_a: + case GDK_KEY_A: + pitch = SCORE_PITCH_A; + break; + case GDK_KEY_b: + case GDK_KEY_B: + pitch = SCORE_PITCH_B; + 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); + _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 (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; + unsigned i, num_notes = scherzo->num_notes_pressed; + int bass_pitch; + const char *chord_name = NULL; + + 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 == 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 (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 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; + + 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); + + 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); + } + + scherzo->notes_pressed[scherzo->num_notes_pressed - 1] = note; + + scherzo_analyze_chord (scherzo); + + return note; +} + + +static void +scherzo_remove_note (scherzo_t *scherzo, score_pitch_t pitch, int octave) +{ + score_note_t *note; + int i; + + for (i = 0; i < scherzo->num_notes_pressed; i++) { + note = scherzo->notes_pressed[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--; + } + } + + scherzo_analyze_chord (scherzo); +} + +static score_note_t * +scherzo_add_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); +} + + +static void +scherzo_remove_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); +} + +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_VALUE(C, NATURAL); + break; + case 'D': + pitch = SCORE_PITCH_VALUE(D, NATURAL); + break; + case 'E': + pitch = SCORE_PITCH_VALUE(E, NATURAL); + break; + case 'F': + pitch = SCORE_PITCH_VALUE(F, NATURAL); + break; + case 'G': + pitch = SCORE_PITCH_VALUE(G, NATURAL); + break; + case 'A': + pitch = SCORE_PITCH_VALUE(A, NATURAL); + break; + case 'B': + pitch = SCORE_PITCH_VALUE(B, NATURAL); + 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_add_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); + _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; + 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; scherzo_t scherzo; + int err; + + srand (time (NULL)); gtk_init (&argc, &argv); - scherzo.score = score_create (NULL); - scherzo.staff_height = 20; + scherzo.ctx = talloc_new (NULL); + + scherzo.score = score_create (scherzo.ctx); + scherzo.staff_height = 100; score_set_staff_height (scherzo.score, scherzo.staff_height); - window = gtk_window_new (GTK_WINDOW_TOPLEVEL); + 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; + + scherzo.num_notes_pressed = 0; + scherzo.notes_pressed = NULL; + + 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; + } - gtk_window_set_default_size (GTK_WINDOW (window), 600, 400); +#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; - g_signal_connect (window, "delete-event", + 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), &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; }