basics working

chat_to_subtitle.py

@@ -4,7 +4,22 @@ import sys
 
 import argh
 
-CHAT_BOX = (1220, 100, 1910, 810)
+def encode_ass(sections):
+	"""
+		Create an ASS text file from an ordered dict of {section name: entries}.
+		Each entries value is a list (line type, fields).
+		fields is a list of fields, to be comma-seperated.
+		Values are NOT escaped, you should ensure you only have allowed characters
+		(eg. only use a comma in the final field of a Dialogue).
+	"""
+	lines = []
+	for section, entries in sections.items():
+		lines.append(f"[{section}]")
+		lines += [
+			"{}: {}".format(type, ", ".join(map(str, fields)))
+			for type, fields in entries
+		]
+	return "\n".join(lines)
 
 def encode_time(time):
 	hours, time = divmod(time, 3600)
@@ -12,7 +27,7 @@ def encode_time(time):
 	return f"{int(hours)}:{int(mins):02d}:{secs:05.2f}"
 
 def encode_dialogue(start, end, text):
-	return f"Dialogue: {encode_time(start)}, {encode_time(end)}, Chat, {text}"
+	return ("Dialogue", [encode_time(start), encode_time(end), "Chat", text])
 
 def message_to_line(message, time_base):
 	time = message["time"] - time_base
@@ -37,38 +52,81 @@ def message_to_line(message, time_base):
 	text = f"{{ \\c&H{color}& }}" + text
 	return time, text
 
-def lines_to_dialogue(start, end, lines):
+def lines_to_dialogue(chat_box, start, end, lines):
 	lines = "\\N".join([text for start, text in lines][::-1])
-	clip_args = ",".join(map(str, CHAT_BOX))
+	clip_args = ",".join(map(str, chat_box))
 	text = f"{{ \\clip({clip_args}) }}" + lines
 	return encode_dialogue(start, end, text)
 
-def gen_dialogues(messages, time_base, message_ttl=10):
+def gen_dialogues(chat_box, messages, time_base, message_ttl=10):
 	window = []
 	prev_start = None
 	for message in messages:
 		next_start, text = message_to_line(message, time_base)
 		while window and window[0][0] + message_ttl < next_start:
 			end = window[0][0] + message_ttl
-			yield lines_to_dialogue(prev_start, end, window)
+			yield lines_to_dialogue(chat_box, prev_start, end, window)
 			window.pop(0)
 			prev_start = end
 		window.append((next_start, text))
 		if prev_start is not None:
-			yield lines_to_dialogue(prev_start, next_start, window)
+			yield lines_to_dialogue(chat_box, prev_start, next_start, window)
 		prev_start = next_start
 	# flush remaining messages
 	while window:
 		end = window[0][0] + message_ttl
-		yield lines_to_dialogue(prev_start, end, window)
+		yield lines_to_dialogue(chat_box, prev_start, end, window)
 		window.pop(0)
 		prev_start = end
 
-def main(time_base=0):
+def gen_prelude(title, author, resolution, style_options):
+	return {
+		"Script Info": [
+			("Title", [title]),
+			("Original Script", [author]),
+			("Script Type", ["V4.00+"]),
+			("PlayResX", [resolution[0]]),
+			("PlayResY", [resolution[1]]),
+		],
+		"V4+ Styles": [
+			("Format", ["Name"] + list(style_options.keys())),
+			("Style", ["Chat"] + list(style_options.values())),
+		],
+	}
+
+def comma_sep(n, type):
+	def parse_comma_sep(s):
+		parts = s.split(",")
+		if len(parts) != n:
+			raise ValueError("Wrong number of parts")
+		return list(map(type, parts))
+
+@argh.arg("--pos", metavar="LEFT,TOP,RIGHT,BOTTOM", type=comma_sep(4, int))
+@argh.arg("--resolution", metavar="WIDTH,HEIGHT", type=comma_sep(2, int))
+def main(
+	title,
+	time_base=0,
+	resolution=(1920, 1080),
+	pos=(1220, 100, 1910, 810),
+	font_size=40,
+	outline_width=1,
+	shadow_width=1,
+):
 	messages = sys.stdin.read().strip().split("\n")
 	messages = [json.loads(line) for line in messages]
-	for dialogue in gen_dialogues(messages, time_base):
+	ass = gen_prelude(title, "Video Strike Team", (1920, 1080), {
-		print(dialogue)
+		"Fontsize": font_size,
+		"BorderStyle": 1, # outline + shadow
+		"Outline": outline_width,
+		"Shadow": shadow_width,
+		"Alignment": 9, # top-right
+		"MarginL": pos[0],
+		"MarginR": resolution[0] - pos[2],
+		"MarginV": pos[1],
+	})
+	ass["Events"] = [("Format", ["Start", "End", "Style", "Text"])]
+	ass["Events"] += list(gen_dialogues(pos, messages, time_base))
+	print(encode_ass(ass))
 
 if __name__ == '__main__':
 	argh.dispatch_command(main)