rewrite SubtitleParser, #180

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simon 2022-03-09 00:25:44 +07:00
parent 40c8e6d146
commit c186798e78
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@ -6,7 +6,6 @@ functionality:
import json
import os
import re
from datetime import datetime
import requests
@ -65,7 +64,7 @@ class YoutubeSubtitle:
if not all_formats:
return False
subtitle = [i for i in all_formats if i["ext"] == "vtt"][0]
subtitle = [i for i in all_formats if i["ext"] == "json3"][0]
subtitle.update(
{"lang": lang, "source": "auto", "media_url": media_url}
)
@ -102,7 +101,7 @@ class YoutubeSubtitle:
# no user subtitles found
return False
subtitle = [i for i in all_formats if i["ext"] == "vtt"][0]
subtitle = [i for i in all_formats if i["ext"] == "json3"][0]
subtitle.update(
{"lang": lang, "source": "user", "media_url": media_url}
)
@ -145,109 +144,65 @@ class YoutubeSubtitle:
class SubtitleParser:
"""parse subtitle str from youtube"""
time_reg = r"^([0-9]{2}:?){3}\.[0-9]{3} --> ([0-9]{2}:?){3}\.[0-9]{3}"
stamp_reg = r"<([0-9]{2}:?){3}\.[0-9]{3}>"
tag_reg = r"</?c>"
def __init__(self, subtitle_str, lang):
self.subtitle_str = subtitle_str
self.subtitle_raw = json.loads(subtitle_str)
self.lang = lang
self.header = False
self.parsed_cue_list = False
self.all_text_lines = False
self.matched = False
self.all_cues = False
def process(self):
"""collection to process subtitle string"""
self._parse_cues()
self._match_text_lines()
self._add_id()
self._timestamp_check()
"""extract relevant que data"""
self.all_cues = []
for idx, event in enumerate(self.subtitle_raw.get("events")):
cue = {
"start": self.ms_conv(event["tStartMs"]),
"end": self.ms_conv(event["tStartMs"] + event["dDurationMs"]),
"text": "".join([i.get("utf8") for i in event["segs"]]),
"idx": idx + 1,
}
self.all_cues.append(cue)
def _parse_cues(self):
"""split into cues"""
all_cues = self.subtitle_str.replace("\n \n", "\n").split("\n\n")
self.header = all_cues[0]
self.all_text_lines = []
self.parsed_cue_list = [self._cue_cleaner(i) for i in all_cues[1:]]
@staticmethod
def ms_conv(ms):
"""convert ms to timestamp"""
hours = str((ms // (1000 * 60 * 60)) % 24).zfill(2)
minutes = str((ms // (1000 * 60)) % 60).zfill(2)
secs = str((ms // 1000) % 60).zfill(2)
millis = str(ms % 1000).zfill(3)
def _cue_cleaner(self, cue):
"""parse single cue"""
all_lines = cue.split("\n")
cue_dict = {"lines": []}
for line in all_lines:
if re.match(self.time_reg, line):
clean = re.search(self.time_reg, line).group()
start, end = clean.split(" --> ")
cue_dict.update({"start": start, "end": end})
else:
clean = re.sub(self.stamp_reg, "", line)
clean = re.sub(self.tag_reg, "", clean)
cue_dict["lines"].append(clean)
if clean.strip() and clean not in self.all_text_lines[-4:]:
# remove immediate duplicates
self.all_text_lines.append(clean)
return cue_dict
def _match_text_lines(self):
"""match unique text lines with timestamps"""
self.matched = []
while self.all_text_lines:
check = self.all_text_lines[0]
matches = [i for i in self.parsed_cue_list if check in i["lines"]]
new_cue = matches[-1]
new_cue["start"] = matches[0]["start"]
for line in new_cue["lines"]:
try:
self.all_text_lines.remove(line)
except ValueError:
continue
self.matched.append(new_cue)
def _timestamp_check(self):
"""check if end timestamp is bigger than start timestamp"""
for idx, cue in enumerate(self.matched):
# this
end = int(re.sub("[^0-9]", "", cue.get("end")))
# next
try:
next_cue = self.matched[idx + 1]
except IndexError:
continue
start_next = int(re.sub("[^0-9]", "", next_cue.get("start")))
if end > start_next:
self.matched[idx]["end"] = next_cue.get("start")
def _add_id(self):
"""add id to matched cues"""
for idx, _ in enumerate(self.matched):
self.matched[idx]["id"] = idx + 1
return f"{hours}:{minutes}:{secs}.{millis}"
def get_subtitle_str(self):
"""stitch cues and return processed new string"""
new_subtitle_str = self.header + "\n\n"
"""create vtt text str from cues"""
subtitle_str = f"WEBVTT\nKind: captions\nLanguage: {self.lang}"
for cue in self.matched:
timestamp = f"{cue.get('start')} --> {cue.get('end')}"
lines = "\n".join(cue.get("lines"))
cue_text = f"{cue.get('id')}\n{timestamp}\n{lines}\n\n"
new_subtitle_str = new_subtitle_str + cue_text
for cue in self.all_cues:
stamp = f"{cue.get('start')} --> {cue.get('end')}"
cue_text = f"\n\n{cue.get('idx')}\n{stamp}\n{cue.get('text')}"
subtitle_str = subtitle_str + cue_text
return new_subtitle_str
return subtitle_str
def create_bulk_import(self, video, source):
"""process matched for es import"""
"""subtitle lines for es import"""
documents = self.create_documents(video, source)
bulk_list = []
channel = video.json_data.get("channel")
document = {
for document in documents:
document_id = document.get("subtitle_fragment_id")
action = {"index": {"_index": "ta_subtitle", "_id": document_id}}
bulk_list.append(json.dumps(action))
bulk_list.append(json.dumps(document))
bulk_list.append("\n")
query_str = "\n".join(bulk_list)
return query_str
def create_documents(self, video, source):
"""process documents"""
documents = self.chunk_list(video.youtube_id)
channel = video.json_data.get("channel")
meta_dict = {
"youtube_id": video.youtube_id,
"title": video.json_data.get("title"),
"subtitle_channel": channel.get("channel_name"),
@ -257,26 +212,35 @@ class SubtitleParser:
"subtitle_source": source,
}
for match in self.matched:
match_id = match.get("id")
document_id = f"{video.youtube_id}-{self.lang}-{match_id}"
action = {"index": {"_index": "ta_subtitle", "_id": document_id}}
document.update(
{
"subtitle_fragment_id": document_id,
"subtitle_start": match.get("start"),
"subtitle_end": match.get("end"),
"subtitle_index": match_id,
"subtitle_line": " ".join(match.get("lines")),
_ = [i.update(meta_dict) for i in documents]
return documents
def chunk_list(self, youtube_id):
"""join cues for bulk import"""
chunk_list = []
chunk = {}
for cue in self.all_cues:
if chunk:
text = f"{chunk.get('subtitle_line')} {cue.get('text')}\n"
chunk["subtitle_line"] = text
else:
idx = len(chunk_list) + 1
chunk = {
"subtitle_index": idx,
"subtitle_line": cue.get("text"),
"subtitle_start": cue.get("start"),
}
)
bulk_list.append(json.dumps(action))
bulk_list.append(json.dumps(document))
bulk_list.append("\n")
query_str = "\n".join(bulk_list)
chunk["subtitle_fragment_id"] = f"{youtube_id}-{self.lang}-{idx}"
return query_str
if cue["idx"] % 5 == 0:
chunk["subtitle_end"] = cue.get("end")
chunk_list.append(chunk)
chunk = {}
return chunk_list
class YoutubeVideo(YouTubeItem, YoutubeSubtitle):