improves phase shift correction between transcription and diarization

whisperlivekit/results_formater.py

@@ -7,20 +7,55 @@ logger = logging.getLogger(__name__)
 logger.setLevel(logging.DEBUG)
 
 PUNCTUATION_MARKS = {'.', '!', '?'}
+CHECK_AROUND = 4
 
 def format_time(seconds: float) -> str:
     """Format seconds as HH:MM:SS."""
     return str(timedelta(seconds=int(seconds)))
 
 
-def check_punctuation_nearby(i, tokens):
-    if i < len(tokens):
-        for ind in range(i, min(len(tokens), i+1)): #we check in the next 1 tokens
-            if tokens[ind].text.strip() in PUNCTUATION_MARKS:
-                return True
+def is_punctuation(token):
+    if token.text.strip() in PUNCTUATION_MARKS:
+        return True
     return False
+
+def next_punctuation_change(i, tokens):
+    for ind in range(i+1, min(len(tokens), i+CHECK_AROUND+1)):
+        if is_punctuation(tokens[ind]):
+            return ind        
+    return None
+
+def next_speaker_change(i, tokens, speaker):
+    for ind in range(i-1, max(0, i-CHECK_AROUND)-1, -1):
+        token = tokens[ind]
+        if is_punctuation(token):
+            break
+        if token.speaker != speaker:
+            return ind, token.speaker
+    return None, speaker
     
-    
+
+def new_line(
+    token,
+    speaker,
+    last_end_diarized,
+    debug_info = ""
+):
+    return {
+            "speaker": int(speaker),
+            "text": token.text + debug_info,
+            "beg": format_time(token.start),
+            "end": format_time(token.end),
+            "diff": round(token.end - last_end_diarized, 2)
+    }
+
+
+def append_token_to_last_line(lines, sep, token, debug_info, last_end_diarized):
+    if token.text:
+        lines[-1]["text"] += sep + token.text + debug_info
+        lines[-1]["end"] = format_time(token.end)
+        lines[-1]["diff"] = round(token.end - last_end_diarized, 2)
+            
 
 def format_output(state, silence, current_time, diarization, debug):
     tokens = state["tokens"]
@@ -34,13 +69,12 @@ def format_output(state, silence, current_time, diarization, debug):
     last_end_diarized = 0
     undiarized_text = []
     tokens, buffer_transcription, buffer_diarization = handle_silences(tokens, buffer_transcription, buffer_diarization, current_time, silence)
+    last_punctuation = None
     for i, token in enumerate(tokens):
         speaker = token.speaker
         
-        if len(tokens) == 1 and not diarization:
-            if speaker == -1: #Speaker -1 means no attributed by diarization. In the frontend, it should appear under 'Speaker 1'
-                speaker = 1
-        
+        if not diarization and speaker == -1: #Speaker -1 means no attributed by diarization. In the frontend, it should appear under 'Speaker 1'
+            speaker = 1
         if diarization and not tokens[-1].speaker == -2:
             if (speaker in [-1, 0]) and token.end >= end_attributed_speaker:
                 undiarized_text.append(token.text)
@@ -53,23 +87,46 @@ def format_output(state, silence, current_time, diarization, debug):
         debug_info = ""
         if debug:
             debug_info = f"[{format_time(token.start)} : {format_time(token.end)}]"
-        if speaker != previous_speaker or not lines:
-            if speaker != previous_speaker and lines and check_punctuation_nearby(i, tokens): # check if punctuation nearby
-                    lines[-1]["text"] += sep + token.text + debug_info
-                    lines[-1]["end"] = format_time(token.end)
-                    lines[-1]["diff"] = round(token.end - last_end_diarized, 2)
+            
+        if not lines:
+            lines.append(new_line(token, speaker, last_end_diarized, debug_info = ""))
+            continue
+        else:
+            previous_speaker = lines[-1]['speaker']
+        
+        if is_punctuation(token):
+            last_punctuation = i
+            
+        
+        if last_punctuation == i-1:
+            if speaker != previous_speaker:
+                # perfect, diarization perfectly aligned
+                lines.append(new_line(token, speaker, last_end_diarized, debug_info = ""))
+                last_punctuation, next_punctuation = None, None
+                continue
+            
+            speaker_change_pos, new_speaker = next_speaker_change(i, tokens, speaker)
+            if speaker_change_pos:
+                # Corrects delay:
+                # That was the idea. Okay haha |SPLIT SPEAKER| that's a good one 
+                # should become:
+                # That was the idea. |SPLIT SPEAKER| Okay haha that's a good one 
+                lines.append(new_line(token, new_speaker, last_end_diarized, debug_info = ""))
             else:
-                lines.append({
-                    "speaker": int(speaker),
-                    "text": token.text + debug_info,
-                    "beg": format_time(token.start),
-                    "end": format_time(token.end),
-                    "diff": round(token.end - last_end_diarized, 2)
-                })
-                previous_speaker = speaker
-        elif token.text:  # Only append if text isn't empty
-            lines[-1]["text"] += sep + token.text + debug_info
-            lines[-1]["end"] = format_time(token.end)
-            lines[-1]["diff"] = round(token.end - last_end_diarized, 2)
+                # No speaker change to come
+                append_token_to_last_line(lines, sep, token, debug_info, last_end_diarized)
+            continue
+        
+
+        if speaker != previous_speaker:
+            if next_punctuation_change(i, tokens):
+                # Corrects advance:
+                # Are you |SPLIT SPEAKER| okay? yeah, sure. Absolutely 
+                # should become:
+                # Are you okay? |SPLIT SPEAKER| yeah, sure. Absolutely 
+                append_token_to_last_line(lines, sep, token, debug_info, last_end_diarized)
+                continue 
+            
+        append_token_to_last_line(lines, sep, token, debug_info, last_end_diarized)
+    return lines, undiarized_text, buffer_transcription, '' 
 
-    return lines, undiarized_text, buffer_transcription, ''