fix: update innertube clients and fix HLS/DASH quality switching

- Update innertube client versions to match yt-dlp (android 21.02.35,
  ios 21.02.3, web 2.20260114.08.00, android_vr 1.65.10)
- Remove obsolete clients (android-test-suite, ios_vr)
- Replace tv_embedded with TVHTML5_SIMPLY (cn 75)
- Add new clients: web_embedded, mweb, tv
- Fix HLS freeze on quality switch: use nextLevel instead of
  currentLevel, handle bufferStalledError, stream proxy segments
  instead of buffering in memory
- Populate DASH quality selector with actual sources (no Auto)
- Render quality-select empty in template, let JS populate per mode

1 files changed, 190 insertions, 0 deletions

diff --git a/youtube/constants.py b/youtube/constants.py
new file mode 100644
index 0000000..780cb10
--- /dev/null
+++ b/youtube/constants.py
@@ -0,0 +1,190 @@
+"""Constants used across yt-local application."""
+
+import collections
+
+YOUTUBE_DOMAINS = ('youtube.com', 'youtu.be', 'youtube-nocookie.com')
+
+DEFAULT_USER_AGENT = 'Mozilla/5.0 (Windows NT 6.1; Win64; x64)'
+MOBILE_USER_AGENT = 'Mozilla/5.0 (Linux; Android 7.0; Redmi Note 4 Build/NRD90M) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Mobile Safari/537.36'
+
+REPLACEMENT_MAP = collections.OrderedDict([
+    ('<', '_'),
+    ('>', '_'),
+    (': ', ' - '),
+    (':', '-'),
+    ('"', "'"),
+    ('/', '_'),
+    ('\\', '_'),
+    ('|', '-'),
+    ('?', ''),
+    ('*', '_'),
+    ('\t', ' '),
+])
+
+DOS_RESERVED_NAMES = frozenset({
+    'con', 'prn', 'aux', 'nul', 'com0', 'com1', 'com2', 'com3',
+    'com4', 'com5', 'com6', 'com7', 'com8', 'com9', 'lpt0',
+    'lpt1', 'lpt2', 'lpt3', 'lpt4', 'lpt5', 'lpt6', 'lpt7',
+    'lpt8', 'lpt9'
+})
+
+INNERTUBE_CLIENTS = {
+    'android': {
+        'INNERTUBE_API_KEY': 'AIzaSyA8eiZmM1FaDVjRy-df2KTyQ_vz_yYM39w',
+        'INNERTUBE_CONTEXT': {
+            'client': {
+                'hl': 'en',
+                'gl': 'US',
+                'clientName': 'ANDROID',
+                'clientVersion': '21.02.35',
+                'osName': 'Android',
+                'osVersion': '11',
+                'androidSdkVersion': 30,
+                'platform': 'MOBILE',
+                'userAgent': 'com.google.android.youtube/21.02.35 (Linux; U; Android 11) gzip'
+            },
+        },
+        'INNERTUBE_CONTEXT_CLIENT_NAME': 3,
+        'REQUIRE_JS_PLAYER': False,
+    },
+
+    'ios': {
+        'INNERTUBE_API_KEY': 'AIzaSyB-63vPrdThhKuerbB2N_l7Kwwcxj6yUAc',
+        'INNERTUBE_CONTEXT': {
+            'client': {
+                'hl': 'en',
+                'gl': 'US',
+                'clientName': 'IOS',
+                'clientVersion': '21.02.3',
+                'deviceMake': 'Apple',
+                'deviceModel': 'iPhone16,2',
+                'osName': 'iPhone',
+                'osVersion': '18.3.2.22D82',
+                'userAgent': 'com.google.ios.youtube/21.02.3 (iPhone16,2; U; CPU iOS 18_3_2 like Mac OS X;)'
+            }
+        },
+        'INNERTUBE_CONTEXT_CLIENT_NAME': 5,
+        'REQUIRE_JS_PLAYER': False
+    },
+
+    'tv_embedded': {
+        'INNERTUBE_API_KEY': 'AIzaSyAO_FJ2SlqU8Q4STEHLGCilw_Y9_11qcW8',
+        'INNERTUBE_CONTEXT': {
+            'client': {
+                'hl': 'en',
+                'gl': 'US',
+                'clientName': 'TVHTML5_SIMPLY',
+                'clientVersion': '1.0',
+            },
+        },
+        'INNERTUBE_CONTEXT_CLIENT_NAME': 75,
+        'REQUIRE_JS_PLAYER': True,
+    },
+
+    'web': {
+        'INNERTUBE_API_KEY': 'AIzaSyAO_FJ2SlqU8Q4STEHLGCilw_Y9_11qcW8',
+        'INNERTUBE_CONTEXT': {
+            'client': {
+                'clientName': 'WEB',
+                'clientVersion': '2.20260114.08.00',
+                'userAgent': DEFAULT_USER_AGENT,
+            }
+        },
+        'INNERTUBE_CONTEXT_CLIENT_NAME': 1
+    },
+
+    'web_embedded': {
+        'INNERTUBE_API_KEY': 'AIzaSyAO_FJ2SlqU8Q4STEHLGCilw_Y9_11qcW8',
+        'INNERTUBE_CONTEXT': {
+            'client': {
+                'hl': 'en',
+                'gl': 'US',
+                'clientName': 'WEB_EMBEDDED_PLAYER',
+                'clientVersion': '1.20260115.01.00',
+            },
+        },
+        'INNERTUBE_CONTEXT_CLIENT_NAME': 56,
+        'REQUIRE_JS_PLAYER': True,
+    },
+
+    'mweb': {
+        'INNERTUBE_API_KEY': 'AIzaSyAO_FJ2SlqU8Q4STEHLGCilw_Y9_11qcW8',
+        'INNERTUBE_CONTEXT': {
+            'client': {
+                'hl': 'en',
+                'gl': 'US',
+                'clientName': 'MWEB',
+                'clientVersion': '2.20260115.01.00',
+                'userAgent': 'Mozilla/5.0 (iPad; CPU OS 16_7_10 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.6 Mobile/15E148 Safari/604.1,gzip(gfe)',
+            }
+        },
+        'INNERTUBE_CONTEXT_CLIENT_NAME': 2,
+        'REQUIRE_JS_PLAYER': True,
+    },
+
+    'tv': {
+        'INNERTUBE_API_KEY': 'AIzaSyAO_FJ2SlqU8Q4STEHLGCilw_Y9_11qcW8',
+        'INNERTUBE_CONTEXT': {
+            'client': {
+                'hl': 'en',
+                'gl': 'US',
+                'clientName': 'TVHTML5',
+                'clientVersion': '7.20260114.12.00',
+                'userAgent': 'Mozilla/5.0 (ChromiumStylePlatform) Cobalt/25.lts.30.1034943-gold (unlike Gecko), Unknown_TV_Unknown_0/Unknown (Unknown, Unknown)',
+            }
+        },
+        'INNERTUBE_CONTEXT_CLIENT_NAME': 7,
+        'REQUIRE_JS_PLAYER': True,
+    },
+
+    'android_vr': {
+        'INNERTUBE_API_KEY': 'AIzaSyA8eiZmM1FaDVjRy-df2KTyQ_vz_yYM39w',
+        'INNERTUBE_CONTEXT': {
+            'client': {
+                'clientName': 'ANDROID_VR',
+                'clientVersion': '1.65.10',
+                'deviceMake': 'Oculus',
+                'deviceModel': 'Quest 3',
+                'androidSdkVersion': 32,
+                'userAgent': 'com.google.android.apps.youtube.vr.oculus/1.65.10 (Linux; U; Android 12L; eureka-user Build/SQ3A.220605.009.A1) gzip',
+                'osName': 'Android',
+                'osVersion': '12L',
+            },
+        },
+        'INNERTUBE_CONTEXT_CLIENT_NAME': 28,
+        'REQUIRE_JS_PLAYER': False,
+    },
+}
+
+THEME_NAMES = {
+    0: 'light_theme',
+    1: 'gray_theme',
+    2: 'dark_theme',
+}
+
+FONT_CHOICES = {
+    0: 'initial',
+    1: '"liberation serif", "times new roman", calibri, carlito, serif',
+    2: 'arial, "liberation sans", sans-serif',
+    3: 'verdana, sans-serif',
+    4: 'tahoma, sans-serif',
+}
+
+URL_ORIGIN = "/https://www.youtube.com"
+
+MAX_RETRIES = 5
+BASE_DELAY = 1.0
+
+TOR_DEFAULT_PORT = 9050
+TOR_CONTROL_DEFAULT_PORT = 9151
+
+DEFAULT_PORT = 9010
+
+# Backward compatibility aliases (matching existing code names)
+desktop_user_agent = 'Mozilla/5.0 (Windows NT 6.1; rv:52.0) Gecko/20100101 Firefox/52.0'
+desktop_ua = (('User-Agent', desktop_user_agent),)
+mobile_ua = (('User-Agent', MOBILE_USER_AGENT),)
+json_header = (('Content-Type', 'application/json'),)
+
+# Re-export for convenience
+url_origin = URL_ORIGIN