Release Vulpes OS 2.7-preview.22

tundra/devices/beatles/call_audio.py

@@ -0,0 +1,71 @@
+# SPDX-License-Identifier: MPL-2.0
+"""Android 6 audio services used by the Nokia firmware, outside Gecko.
+
+Transaction IDs and argument types: AOSP android-6.0.1_r1,
+frameworks/av/media/libmedia/{IAudioPolicyService,IAudioFlinger}.cpp.
+This adapter is specific to that ABI. No arbitrary Binder transaction is exposed.
+"""
+import re
+import subprocess
+import time
+
+
+class CallAudio:
+    def __init__(self):
+        self.mode=0;self.muted=False;self.speaker=False;self.available=False
+        self.original=None;self.retry_at=0
+    def transact(self,service,method,*values):
+        command=['/system/bin/service','call','media.audio_'+service,str(method)]
+        for value in values:command.extend(('i32',str(value)))
+        result=subprocess.run(command,stdout=subprocess.PIPE,stderr=subprocess.DEVNULL,
+            text=True,timeout=2,env={'PATH':'/system/bin','LD_LIBRARY_PATH':'/system/lib'})
+        match=re.fullmatch(r"Result: Parcel\(([0-9a-fA-F]{8})\s+'[^']*'\)\s*",result.stdout)
+        if result.returncode or not match:raise RuntimeError('CALL_AUDIO_UNAVAILABLE')
+        return int(match[1],16)
+    def initialize(self):
+        if self.available:return
+        if time.monotonic()<self.retry_at:raise RuntimeError('CALL_AUDIO_UNAVAILABLE')
+        try:
+            muted=self.transact('flinger',18);route=self.transact('policy',6,0)
+            if muted not in (0,1) or route not in range(16):raise RuntimeError('CALL_AUDIO_UNAVAILABLE')
+            if self.original is None:self.original=(muted,route)
+            self.muted=bool(muted);self.speaker=route==1;self.available=True
+        except (OSError,RuntimeError,subprocess.SubprocessError):
+            self.retry_at=time.monotonic()+5;raise RuntimeError('CALL_AUDIO_UNAVAILABLE') from None
+    def set_mode(self,mode):
+        self.initialize()
+        if self.mode==mode:return
+        if self.transact('policy',3,mode):raise RuntimeError('CALL_AUDIO_UNAVAILABLE')
+        self.mode=mode
+    def update(self,calls):
+        mode=2 if any(c['state'] in ('active','held','dialing','alerting') for c in calls) else 1 if calls else 0
+        try:self.set_mode(mode)
+        except (OSError,RuntimeError,subprocess.SubprocessError):
+            self.available=False;self.retry_at=time.monotonic()+5
+    def request(self,value):
+        operation=value.get('operation')
+        if operation not in ('status','set'):raise ValueError('INVALID_REQUEST')
+        for key in ('muted','speaker'):
+            if key in value and type(value[key]) is not bool:raise ValueError('INVALID_REQUEST')
+        self.initialize()
+        if operation=='set':
+            if 'speaker' in value and value['speaker']!=self.speaker:
+                if self.transact('policy',5,0,int(value['speaker'])):raise RuntimeError('CALL_AUDIO_UNAVAILABLE')
+                actual=self.transact('policy',6,0)
+                if actual!=int(value['speaker']):raise RuntimeError('CALL_AUDIO_UNAVAILABLE')
+                self.speaker=value['speaker']
+            if 'muted' in value and value['muted']!=self.muted:
+                if self.transact('flinger',17,int(value['muted'])):raise RuntimeError('CALL_AUDIO_UNAVAILABLE')
+                if self.transact('flinger',18)!=int(value['muted']):raise RuntimeError('CALL_AUDIO_UNAVAILABLE')
+                self.muted=value['muted']
+        return {'muted':self.muted,'speaker':self.speaker,'active':self.mode==2,'available':self.available}
+    def restore(self):
+        if self.original is None:return
+        muted,route=self.original
+        changes=[]
+        if self.mode:changes.append(('policy',3,(0,)))
+        if self.speaker!=(route==1):changes.append(('policy',5,(0,route)))
+        if self.muted!=bool(muted):changes.append(('flinger',17,(muted,)))
+        for service,method,values in changes:
+            try:self.transact(service,method,*values)
+            except (OSError,RuntimeError,subprocess.SubprocessError):pass