Add example setting playback rate (#849)

Author: emontnemery

examples/set_playback_rate_example.py

@@ -0,0 +1,74 @@
+"""
+Example changing the playback rate.
+
+"""
+
+# pylint: disable=invalid-name
+
+import argparse
+import sys
+import time
+
+import pychromecast
+
+from .common import add_log_arguments, configure_logging
+
+# Enable deprecation warnings etc.
+if not sys.warnoptions:
+    import warnings
+
+    warnings.simplefilter("default")
+
+# Change to the friendly name of your Chromecast
+CAST_NAME = "Living Room"
+
+# Change to an audio or video url
+MEDIA_URL = (
+    "http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4"
+)
+
+parser = argparse.ArgumentParser(
+    description="Example on how to use the Media Controller."
+)
+parser.add_argument(
+    "--cast", help='Name of cast device (default: "%(default)s")', default=CAST_NAME
+)
+parser.add_argument(
+    "--known-host",
+    help="Add known host (IP), can be used multiple times",
+    action="append",
+)
+add_log_arguments(parser)
+parser.add_argument(
+    "--url", help='Media url (default: "%(default)s")', default=MEDIA_URL
+)
+args = parser.parse_args()
+
+configure_logging(args)
+
+chromecasts, browser = pychromecast.get_listed_chromecasts(
+    friendly_names=[args.cast], known_hosts=args.known_host
+)
+if not chromecasts:
+    print(f'No chromecast with name "{args.cast}" discovered')
+    sys.exit(1)
+
+cast = chromecasts[0]
+
+# Start socket client's worker thread and wait for initial status update
+cast.wait()
+
+print(f'Playing media "{args.url}"')
+cast.play_media(args.url, "video/mp4")
+
+print("Waiting for media session to be active")
+cast.media_controller.block_until_active()
+
+SPEEDS = [0.5, 0.75, 1, 1.25, 1.5, 1.75, 2]
+for speed in SPEEDS:
+    time.sleep(10)
+    print(f"Setting playback rate to {speed}")
+    cast.media_controller.set_playback_rate(speed)
+
+# Shut down discovery
+browser.stop_discovery()