added buffered reads from disk io and transcoding

croaker/streamer.py

@@ -1,6 +1,5 @@
 import queue
 import logging
-import io
 import os
 import threading
 from functools import cached_property
@@ -28,8 +27,7 @@ class AudioStreamer(threading.Thread):
 
     @cached_property
     def silence(self):
-        with (Path(__file__).parent / 'silence.mp3').open('rb') as stream:
-            return io.BytesIO(stream.read())
+        return transcoder.open(Path(__file__).parent / 'silence.mp3', bufsize=2*self.chunk_size)
 
     @cached_property
     def _shout(self):
@@ -92,13 +90,12 @@ class AudioStreamer(threading.Thread):
         logger.debug("Load event cleared.")
 
     def _read_chunk(self, filehandle):
-        chunk = filehandle.read(self.chunk_size)
-        return chunk
+        return filehandle.read(self.chunk_size)
 
     def play_file(self, track: Path):
         logger.debug(f"Streaming {track.stem = }")
         self._shout.set_metadata({"song": track.stem})
-        with transcoder.open(track) as fh:
+        with transcoder.open(track, bufsize=2*self.chunk_size) as fh:
             return self.play_from_stream(fh)
 
     def play_from_stream(self, stream):

croaker/transcoder.py

@@ -7,7 +7,7 @@ import ffmpeg
 logger = logging.getLogger('transcoder')
 
 
-def open(infile: Path):
+def open(infile: Path, bufsize: int = 4096):
     """
     Return a stream of mp3 data for the given path on disk.
 
@@ -18,7 +18,7 @@ def open(infile: Path):
     suffix = infile.suffix.lower()
     if suffix == '.mp3':
         logger.debug(f"Not transcoding mp3 {infile = }")
-        return infile.open('rb')
+        return infile.open('rb', buffering=bufsize)
 
     ffmpeg_args = (
         ffmpeg
@@ -29,7 +29,7 @@ def open(infile: Path):
     )
 
     # Force close STDIN to prevent ffmpeg from trying to read from it. silly ffmpeg.
-    proc = subprocess.Popen(ffmpeg_args, stdout=subprocess.PIPE, stdin=subprocess.PIPE)
+    proc = subprocess.Popen(ffmpeg_args, bufsize=bufsize, stdout=subprocess.PIPE, stdin=subprocess.PIPE)
     proc.stdin.close()
     logger.debug(f"Spawned ffmpeg (PID {proc.pid}) with args {ffmpeg_args = }")
     return proc.stdout