From ce6f6235d1c668c3e58abcab3b30376417042dac Mon Sep 17 00:00:00 2001
From: Aleksander Wasaznik <aleksander@wasaznik.com>
Date: Mon, 6 Feb 2017 20:28:03 +0100
Subject: [PATCH] Implement a basic MPV controller

Raw commands are supported. Events not yet.
---
 grzegorz/mpv.py | 83 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 grzegorz/mpv.py

diff --git a/grzegorz/mpv.py b/grzegorz/mpv.py
new file mode 100644
index 0000000..cf1df16
--- /dev/null
+++ b/grzegorz/mpv.py
@@ -0,0 +1,83 @@
+import asyncio
+import json
+
+from . import nyasync
+
+class MPV:
+    _ipc_endpoint = 'mpv_ipc.socket'
+
+    def __init__(self):
+        self.requests = nyasync.Queue()
+        self.responces = nyasync.Queue()
+        self.events = nyasync.Queue()
+
+    async def run(self):
+        self.proc = await asyncio.create_subprocess_exec(
+            'mpv',
+            '--input-ipc-server', self._ipc_endpoint,
+            '--idle',
+            '--force-window',
+            '--fullscreen',
+            '--no-terminal',
+            '--keep-open', # Keep last frame of video on end of video
+            '--no-input-default-bindings',
+            )
+
+        while self.is_running():
+            try:
+                self.ipc_conn = await nyasync.unix_connection(self._ipc_endpoint)
+                break
+            except (FileNotFoundError, ConnectionRefusedError):
+                continue
+            await asyncio.sleep(0.1)
+        else:
+            raise Exception("MPV died before socket connected")
+
+        await asyncio.gather(
+            self.ensure_running(),
+            self.process_outgoing(),
+            self.process_incomming(),
+        )
+
+    def is_running(self):
+        return self.proc.returncode is None
+
+    async def ensure_running(self):
+        await self.proc.wait()
+        raise Exception("MPV died unexpectedtly")
+
+    async def process_outgoing(self):
+        async for request in self.requests:
+            self.ipc_conn.write(json.dumps(request).encode('utf-8'))
+            self.ipc_conn.write(b'\n')
+
+    async def process_incomming(self):
+        async for responce in self.ipc_conn:
+            msg = json.loads(responce)
+            if 'event' in msg:
+                self.events.put_nowait(msg)
+            else: # responce
+                self.responces.put_nowait(msg)
+
+class MPVControl:
+    def __init__(self):
+        self.mpv = MPV()
+        self.request_lock = asyncio.Lock()
+
+    async def run(self):
+        await asyncio.gather(
+            self.mpv.run(),
+            self.process_events(),
+        )
+
+    async def process_events(self):
+        async for event in self.mpv.events:
+            pass
+
+    async def send_request(self, msg):
+        with await self.request_lock:
+            # Note: If asyncio.Lock is FIFO, the put can be moved out of the
+            # critical section. If await is FIFO, the lock is unnessesary. This
+            # is the safest option.
+            self.mpv.requests.put_nowait(msg)
+            return await self.mpv.responces.get()