From 05ce8e10cda54daecc52fd0e04972b28cc811668 Mon Sep 17 00:00:00 2001
From: JSDurand <mmemmew@gmail.com>
Date: Mon, 12 Jul 2021 16:46:54 +0800
Subject: Volume changing command

Now the sheets can contain commands to change volumes for the
channels.
---
 parser.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 53 insertions(+), 7 deletions(-)

(limited to 'parser.c')

diff --git a/parser.c b/parser.c
index 3b0d30c..1764f86 100644
--- a/parser.c
+++ b/parser.c
@@ -13,12 +13,16 @@
 /* A note of type BEAT_DURATION_TYPE stores the new bpm in the secs
    field. */
 
+/* A note of type VOLUME_TYPE stores the new volume in the secs
+   field. */
+
 typedef enum {
   NONE_TYPE,
   NOTE_TYPE,
   SILENT_TYPE,
   INSTRUMENT_TYPE,
-  BEAT_DURATION_TYPE
+  BEAT_DURATION_TYPE,
+  VOLUME_TYPE
 } PType;
 
 struct PNote_s {
@@ -103,6 +107,11 @@ print_note(const PNote note)
             "%.3f beats per minute.\n",
             note.secs);
     break;
+  case VOLUME_TYPE:
+    fprintf(stderr, "a note of the type that changes the volume to "
+            "%.3f times.\n",
+            note.secs);
+    break;
   }
 }
 
@@ -267,6 +276,28 @@ read_sheet(const char *str, LENT len)
       if (*(str+counter) == ' ') {
         /* Just skip spaces so that they don't block us reading anchor
            chars. */
+      } else if (*(str+counter) == 'v') {
+        /* changing volume note */
+
+        counter++;
+
+        for (;*(str+counter) == ' ';) counter++;
+        
+        if (*(str+counter) != '\n' &&
+            *(str+counter) != 13 &&
+            sscanf(str+counter, "%lf%n",
+                   &local, &num_chars_read) == 1) {
+          temp_note = (PNote) {
+            NULL, local,
+            0, VOLUME_TYPE, NULL
+          };
+
+          /* fprintf(stderr, "print a note\n");
+           * print_note(temp_note); */
+
+          counter += num_chars_read-1;
+        }
+        *(current_unit.notes+channel_num) = temp_note;
       } else if (*(str+counter) == 'b') {
         /* changing bpm note */
 
@@ -528,6 +559,10 @@ play_sheet(const PSheet sh, const Volume v)
 
   Beats dur = BEAT_DUR; 
 
+  /* Each channel can specify its sound. */
+  
+  Volume *volume_per_channel = MYALLOC(Volume, channel_num);;
+
 #ifdef DEBUG
   fprintf(stderr, "before finding num\n");
 #endif
@@ -550,12 +585,14 @@ play_sheet(const PSheet sh, const Volume v)
 #endif
 
     *(temp+i) = MYALLOC(WaveFrag, *(num_notes_per_channel+i));
+    
+    *(channel_num_array+i) = 0;
+    
+    *(volume_per_channel+i) = 1.0;
   }
 
   war = MYALLOC(WaveFrag, channel_num);
 
-  for (LENT i = 0; i < channel_num;) *(channel_num_array+i++) = 0;
-
 #ifdef DEBUG
   fprintf(stderr, "before for loop\n");
 #endif
@@ -575,7 +612,8 @@ play_sheet(const PSheet sh, const Volume v)
 
       if (pn.type != NOTE_TYPE &&
           pn.type != SILENT_TYPE &&
-          pn.type != BEAT_DURATION_TYPE) continue;
+          pn.type != BEAT_DURATION_TYPE &&
+          pn.type != VOLUME_TYPE) continue;
 
       if (pn.len >= 10) {
         fprintf(stderr, "A note cannot have more than 10 semitones together.\n");
@@ -590,17 +628,24 @@ play_sheet(const PSheet sh, const Volume v)
       switch (pn.type) {
       case NOTE_TYPE:
         for (LENT k = 0; k < pn.len; k++) {
-          *(st_temp+k) = make_sound(inst, v * ((k==1) ? 0.3 : 1.0),
+          *(st_temp+k) = make_sound(inst, v * *(volume_per_channel+j),
                                     stoh(*(pn.tones+k)), pn.secs * dur);
         }
         break;
       case BEAT_DURATION_TYPE:
         dur = 60.0 / pn.secs;
         break;
-      default:
-        /* SILENT_TYPE */
+      case VOLUME_TYPE:
+        *(volume_per_channel+j) = pn.secs;
+        break;
+      case SILENT_TYPE:
         *(st_temp) = silent_note(pn.secs, dur);
         break;
+      default:
+        /* Not goint to happen */
+        fprintf(stderr, "something weird happens in play_sheet.\n");
+        exit(1);
+        break;
       }
 
 #ifdef DEBUG
@@ -644,6 +689,7 @@ play_sheet(const PSheet sh, const Volume v)
   free(temp);
   free(num_notes_per_channel);
   free(channel_num_array);
+  free(volume_per_channel);
 
 #ifdef DEBUG
   fprintf(stderr, "after merging\n");
-- 
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