Add ffmpeg example

Author: nshmyrev

websocket/test_ffmpeg.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python3
+
+import asyncio
+import websockets
+import sys
+
+async def hello(uri):
+    async with websockets.connect(uri) as websocket:
+
+        proc = await asyncio.create_subprocess_exec(
+                       'ffmpeg', '-nostdin', '-loglevel', 'quiet', '-i', sys.argv[1],
+                       '-ar', '8000', '-ac', '1', '-f', 's16le', '-',
+                       stdout=asyncio.subprocess.PIPE)
+
+        while True:
+            data = await proc.stdout.read(8000)
+
+            if len(data) == 0:
+                break
+
+            await websocket.send(data)
+            print (await websocket.recv())
+
+        await websocket.send('{"eof" : 1}')
+        print (await websocket.recv())
+
+        await proc.wait()
+
+asyncio.get_event_loop().run_until_complete(
+    hello('ws://localhost:2700'))
+asyncio.get_event_loop().close()