[Caltrans] Add extractor (#2781)

Closes #2775

Authored by: Bricio

yt_dlp/extractor/caltrans.py

@@ -0,0 +1,41 @@
+# coding: utf-8
+from __future__ import unicode_literals
+
+from .common import InfoExtractor
+
+
+class CaltransIE(InfoExtractor):
+    _VALID_URL = r'https?://(?:[^/]+\.)?ca\.gov/vm/loc/[^/]+/(?P<id>[a-z0-9_]+)\.htm'
+    _TEST = {
+        'url': 'https://cwwp2.dot.ca.gov/vm/loc/d3/hwy50at24th.htm',
+        'info_dict': {
+            'id': 'hwy50at24th',
+            'ext': 'ts',
+            'title': 'US-50 : Sacramento : Hwy 50 at 24th',
+            'live_status': 'is_live',
+            'thumbnail': 'https://cwwp2.dot.ca.gov/data/d3/cctv/image/hwy50at24th/hwy50at24th.jpg',
+        }
+    }
+
+    def _real_extract(self, url):
+        video_id = self._match_id(url)
+        webpage = self._download_webpage(url, video_id)
+
+        global_vars = self._search_regex(
+            r'<script[^<]+?([^<]+\.m3u8[^<]+)</script>',
+            webpage, 'Global Vars')
+        route_place = self._search_regex(r'routePlace\s*=\s*"([^"]+)"', global_vars, 'Route Place', fatal=False)
+        location_name = self._search_regex(r'locationName\s*=\s*"([^"]+)"', global_vars, 'Location Name', fatal=False)
+        poster_url = self._search_regex(r'posterURL\s*=\s*"([^"]+)"', global_vars, 'Poster Url', fatal=False)
+        video_stream = self._search_regex(r'videoStreamURL\s*=\s*"([^"]+)"', global_vars, 'Video Stream URL', fatal=False)
+
+        formats = self._extract_m3u8_formats(video_stream, video_id, 'ts', live=True)
+        self._sort_formats(formats)
+
+        return {
+            'id': video_id,
+            'title': f'{route_place} : {location_name}',
+            'is_live': True,
+            'formats': formats,
+            'thumbnail': poster_url,
+        }