X-Git-Url: https://git.cworth.org/git?a=blobdiff_plain;f=scherzo.c;h=98f70bd99ff2485e0cf3e0b4ad542341353f41f5;hb=0d91a08ddeea3e07edb853e01f3b3dfde18ea7d7;hp=ae8ea3284760ba900b6dfdb07f8ba72a2c01fd4b;hpb=82d0481012c66ad272598b337e062310f3adc174;p=scherzo diff --git a/scherzo.c b/scherzo.c index ae8ea32..98f70bd 100644 --- a/scherzo.c +++ b/scherzo.c @@ -19,14 +19,43 @@ #include #include +#include + #include "score.h" +#include "mnemon.h" #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; + 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; static int @@ -63,7 +92,7 @@ on_expose_event_draw (GtkWidget *widget, cairo_paint (cr); /* Add some padding on the sides and top */ - cairo_translate (cr, pad, (int) scherzo->staff_height / 2); + cairo_translate (cr, pad, scherzo->staff_height); score_set_staff_height (score, scherzo->staff_height); score_set_width (score, widget_width - 2 * pad); @@ -105,41 +134,355 @@ on_key_press_event (GtkWidget *widget, return FALSE; } +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; + } +} + +static score_note_t * +scherzo_add_note_midi (scherzo_t *scherzo, unsigned char midi_note) +{ + score_staff_t *staff; + score_pitch_t pitch; + int octave; + score_note_t *note; + + staff = scherzo->challenge.staff; + + _midi_to_score_pitch_and_octave (midi_note, &pitch, &octave); + + 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; + + return note; +} + +static void +scherzo_remove_note_midi (scherzo_t *scherzo, unsigned char midi_note) +{ + score_pitch_t pitch; + int octave; + score_note_t *note; + int i; + + _midi_to_score_pitch_and_octave (midi_note, &pitch, &octave); + + 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--; + } + } +} + +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 (note->pitch == challenge->note->pitch && + note->octave == challenge->note->octave) + { + 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->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 = 24; + scherzo.ctx = talloc_new (NULL); + + scherzo.score = score_create (scherzo.ctx); + scherzo.staff_height = 48; 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.num_notes_pressed = 0; + scherzo.notes_pressed = NULL; - gtk_window_set_default_size (GTK_WINDOW (window), 600, 400); + mnemon_init (&scherzo.mnemon); + /* XXX: Should create a default file if one cannot be loaded. */ + mnemon_load_category (&scherzo.mnemon, "scherzo"); - g_signal_connect (window, "delete-event", + 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), 600, 400); + + 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 (window, "key-press-event", + g_signal_connect (scherzo.window, "key-press-event", G_CALLBACK (on_key_press_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; }