cmd/load-app: Load chromecast App and Content ID

Add a new command to load a specific app on the chromecast and play the
content id. This should be useful for loading media on arbitrary
chromecast apps.

Updates: #90

README.md

@@ -58,6 +58,7 @@ Available Commands:
   help        Help about any command
   httpserver  Start the HTTP server
   load        Load and play media on the chromecast
+  load-app    Load and play content on a chromecast app
   ls          List devices
   mute        Mute the chromecast
   next        Play the next available media

application/application.go

@@ -33,8 +33,7 @@ var (
 const (
 	// 'CC1AD845' seems to be a predefined app; check link
 	// https://gist.github.com/jloutsenhizer/8855258
-	// https://github.com/thibauts/node-castv2
-	defaultChromecastAppId = "CC1AD845"
+	defaultChromecastAppID = "CC1AD845"
 
 	defaultSender = "sender-0"
 	defaultRecv   = "receiver-0"
@@ -699,6 +698,32 @@ func (a *Application) Load(filenameOrUrl, contentType string, transcode, detach,
 	return nil
 }
 
+func (a *Application) LoadApp(appID, contentID string) error {
+	// old list https://gist.github.com/jloutsenhizer/8855258.
+	// NOTE: This isn't concurrent safe, but it doesn't need to be at the moment!
+	a.MediaStart()
+
+	if err := a.ensureIsAppID(appID); err != nil {
+		return errors.Wrapf(err, "unable to change chromecast app")
+	}
+
+	// Send the command to the chromecast
+	a.sendMediaRecv(&cast.LoadMediaCommand{
+		PayloadHeader: cast.LoadHeader,
+		CurrentTime:   0,
+		Autoplay:      true,
+		Media: cast.MediaItem{
+			ContentId:  contentID,
+			StreamType: "BUFFERED",
+		},
+	})
+
+	// Wait until we have been notified that the media has finished playing
+	a.MediaWait()
+
+	return nil
+}
+
 func (a *Application) QueueLoad(filenames []string, contentType string, transcode bool) error {
 
 	mediaItems, err := a.loadAndServeFiles(filenames, contentType, transcode)
@@ -742,14 +767,18 @@ func (a *Application) QueueLoad(filenames []string, contentType string, transcod
 func (a *Application) ensureIsDefaultMediaReceiver() error {
 	// If the current chromecast application isn't the Default Media Receiver
 	// we need to change it.
-	if a.application == nil || a.application.AppId != defaultChromecastAppId {
+	return a.ensureIsAppID(defaultChromecastAppID)
+}
+
+func (a *Application) ensureIsAppID(appID string) error {
+	if a.application == nil || a.application.AppId != appID {
 		_, err := a.sendAndWaitDefaultRecv(&cast.LaunchRequest{
 			PayloadHeader: cast.LaunchHeader,
-			AppId:         defaultChromecastAppId,
+			AppId:         appID,
 		})
 
 		if err != nil {
-			return errors.Wrap(err, "unable to change to default media receiver")
+			return errors.Wrapf(err, "unable to change to appID %q", appID)
 		}
 		// Update the 'application' and 'media' field on the 'CastApplication'
 		return a.Update()

cmd/load-app.go

@@ -0,0 +1,71 @@
+// Copyright © 2021 Jonathan Pentecost <[email protected]>
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/vishen/go-chromecast/ui"
+
+	"github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+)
+
+// loadAppCmd represents the load command
+var loadAppCmd = &cobra.Command{
+	Use:   "load-app <app-id> <content-id>",
+	Short: "Load and play content on a chromecast app",
+	Long: `Load and play content on a chromecast app. This requires
+the chromecast receiver app to be specified. An older list can be found 
+here https://gist.github.com/jloutsenhizer/8855258.
+`,
+	RunE: func(cmd *cobra.Command, args []string) error {
+		if len(args) != 2 {
+			return fmt.Errorf("requires exactly two arguments")
+		}
+		app, err := castApplication(cmd, args)
+		if err != nil {
+			fmt.Printf("unable to get cast application: %v\n", err)
+			return nil
+		}
+
+		// Optionally run a UI when playing this media:
+		runWithUI, _ := cmd.Flags().GetBool("with-ui")
+		if runWithUI {
+			go func() {
+				if err := app.LoadApp(args[0], args[1]); err != nil {
+					logrus.WithError(err).Fatal("unable to load media")
+				}
+			}()
+
+			ccui, err := ui.NewUserInterface(app)
+			if err != nil {
+				logrus.WithError(err).Fatal("unable to prepare a new user-interface")
+			}
+			return ccui.Run()
+		}
+
+		// Otherwise just run in CLI mode:
+		if err := app.LoadApp(args[0], args[1]); err != nil {
+			fmt.Printf("unable to load media: %v\n", err)
+			return nil
+		}
+		return nil
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(loadAppCmd)
+}

cmd/load.go

@@ -28,7 +28,7 @@ var loadCmd = &cobra.Command{
 	Use:   "load <filename_or_url>",
 	Short: "Load and play media on the chromecast",
 	Long: `Load and play media files on the chromecast, this will
-start a streaming server locally and serve the media file to the
+start a HTTP server locally and will stream the media file to the
 chromecast if it is a local file, otherwise it will load the url.
 
 If the media file is an unplayable media type by the chromecast, this

testdata/helptext.txt

@@ -16,6 +16,7 @@ Available Commands:
   help        Help about any command
   httpserver  Start the HTTP server
   load        Load and play media on the chromecast
+  load-app    Load and play content on a chromecast app
   ls          List devices
   mute        Mute the chromecast
   next        Play the next available media