[video_player] Adds audio track metadata fetching and audio track selection feature #9925
+3,724
−126
There are no files selected for viewing
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,326 @@ | ||
| // Copyright 2013 The Flutter Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
|
|
||
| import 'package:flutter/material.dart'; | ||
| import 'package:video_player/video_player.dart'; | ||
|
|
||
| /// A demo page that showcases audio track functionality. | ||
| class AudioTracksDemo extends StatefulWidget { | ||
| /// Creates an AudioTracksDemo widget. | ||
| const AudioTracksDemo({super.key}); | ||
|
|
||
| @override | ||
| State<AudioTracksDemo> createState() => _AudioTracksDemoState(); | ||
| } | ||
|
|
||
| class _AudioTracksDemoState extends State<AudioTracksDemo> { | ||
| VideoPlayerController? _controller; | ||
| List<VideoAudioTrack> _audioTracks = <VideoAudioTrack>[]; | ||
| bool _isLoading = false; | ||
| String? _error; | ||
|
|
||
| // Sample video URLs with multiple audio tracks | ||
| final List<String> _sampleVideos = <String>[ | ||
| 'https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4', | ||
| 'https://devstreaming-cdn.apple.com/videos/streaming/examples/bipbop_16x9/bipbop_16x9_variant.m3u8', | ||
| // Add HLS stream with multiple audio tracks if available | ||
| 'https://devstreaming-cdn.apple.com/videos/streaming/examples/img_bipbop_adv_example_fmp4/master.m3u8', | ||
| ]; | ||
|
|
||
| int _selectedVideoIndex = 0; | ||
|
|
||
| @override | ||
| void initState() { | ||
| super.initState(); | ||
| _initializeVideo(); | ||
| } | ||
|
|
||
| Future<void> _initializeVideo() async { | ||
| setState(() { | ||
| _isLoading = true; | ||
| _error = null; | ||
| }); | ||
|
|
||
| try { | ||
| await _controller?.dispose(); | ||
|
|
||
| _controller = VideoPlayerController.networkUrl( | ||
|
There was a problem hiding this comment. nit: here and everywhere (especially in |
||
| Uri.parse(_sampleVideos[_selectedVideoIndex]), | ||
| ); | ||
|
|
||
| await _controller!.initialize(); | ||
|
|
||
| // Get audio tracks after initialization | ||
| await _loadAudioTracks(); | ||
|
|
||
| setState(() { | ||
| _isLoading = false; | ||
| }); | ||
| } catch (e) { | ||
| setState(() { | ||
| _error = 'Failed to initialize video: $e'; | ||
| _isLoading = false; | ||
| }); | ||
| } | ||
| } | ||
|
|
||
| Future<void> _loadAudioTracks() async { | ||
| if (_controller == null || !_controller!.value.isInitialized) { | ||
| return; | ||
| } | ||
|
|
||
| try { | ||
| final List<VideoAudioTrack> tracks = await _controller!.getAudioTracks(); | ||
| setState(() { | ||
| _audioTracks = tracks; | ||
| }); | ||
| } catch (e) { | ||
| setState(() { | ||
| _error = 'Failed to load audio tracks: $e'; | ||
| }); | ||
| } | ||
| } | ||
|
|
||
| Future<void> _selectAudioTrack(String trackId) async { | ||
| if (_controller == null) { | ||
| return; | ||
| } | ||
|
|
||
| try { | ||
| await _controller!.selectAudioTrack(trackId); | ||
|
|
||
| // Add a small delay to allow ExoPlayer to process the track selection change | ||
| // This is needed because ExoPlayer's track selection update is asynchronous | ||
| await Future<void>.delayed(const Duration(milliseconds: 100)); | ||
|
There was a problem hiding this comment. Hmm this could be a major source of flakiness. Shouldn't There was a problem hiding this comment. Also, a major source of user errors if this isn't documented (still I would prefer that we hide the ugliness within our implementation so the user doesn't have to worry about that). |
||
|
|
||
| // Reload tracks to update selection status | ||
| await _loadAudioTracks(); | ||
|
|
||
| if (!mounted) { | ||
|
There was a problem hiding this comment. This check is also needed whenever you want to call |
||
| return; | ||
| } | ||
| ScaffoldMessenger.of( | ||
| context, | ||
| ).showSnackBar(SnackBar(content: Text('Selected audio track: $trackId'))); | ||
| } catch (e) { | ||
| if (!mounted) { | ||
| return; | ||
| } | ||
| ScaffoldMessenger.of(context).showSnackBar( | ||
| SnackBar(content: Text('Failed to select audio track: $e')), | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| @override | ||
| void dispose() { | ||
| _controller?.dispose(); | ||
| super.dispose(); | ||
| } | ||
|
|
||
| @override | ||
| Widget build(BuildContext context) { | ||
| return Scaffold( | ||
| appBar: AppBar( | ||
| title: const Text('Audio Tracks Demo'), | ||
| backgroundColor: Theme.of(context).colorScheme.inversePrimary, | ||
| ), | ||
| body: Column( | ||
| children: <Widget>[ | ||
| // Video selection dropdown | ||
| Padding( | ||
| padding: const EdgeInsets.all(16.0), | ||
| child: DropdownButtonFormField<int>( | ||
|
There was a problem hiding this comment. Consider using https://api.flutter.dev/flutter/material/DropdownMenuFormField-class.html instead, IIRC the Dropdown* widgets are going to be replaced. |
||
| value: _selectedVideoIndex, | ||
| decoration: const InputDecoration( | ||
| labelText: 'Select Video', | ||
| border: OutlineInputBorder(), | ||
| ), | ||
| items: | ||
| _sampleVideos.asMap().entries.map((MapEntry<int, String> entry) { | ||
|
There was a problem hiding this comment. nit: I'd use https://main-api.flutter.dev/flutter/dart-collection/IterableExtensions/indexed.html instead of |
||
| return DropdownMenuItem<int>( | ||
| value: entry.key, | ||
| child: Text('Video ${entry.key + 1}'), | ||
| ); | ||
| }).toList(), | ||
| onChanged: (int? value) { | ||
| if (value != null && value != _selectedVideoIndex) { | ||
|
There was a problem hiding this comment. I read the material DropdownMenu documentation and it doesn't really tell me when the callback would give me a |
||
| setState(() { | ||
| _selectedVideoIndex = value; | ||
| }); | ||
| _initializeVideo(); | ||
| } | ||
| }, | ||
| ), | ||
| ), | ||
|
|
||
| // Video player | ||
| Expanded( | ||
| flex: 2, | ||
| child: ColoredBox(color: Colors.black, child: _buildVideoPlayer()), | ||
| ), | ||
|
|
||
| // Audio tracks list | ||
| Expanded(flex: 3, child: _buildAudioTracksList()), | ||
| ], | ||
| ), | ||
| floatingActionButton: FloatingActionButton( | ||
| onPressed: _loadAudioTracks, | ||
| tooltip: 'Refresh Audio Tracks', | ||
| child: const Icon(Icons.refresh), | ||
| ), | ||
| ); | ||
| } | ||
|
|
||
| Widget _buildVideoPlayer() { | ||
| if (_isLoading) { | ||
| return const Center(child: CircularProgressIndicator()); | ||
| } | ||
|
|
||
| if (_error != null) { | ||
|
There was a problem hiding this comment. nit: |
||
| return Center( | ||
| child: Column( | ||
| mainAxisAlignment: MainAxisAlignment.center, | ||
| children: <Widget>[ | ||
| Icon(Icons.error, size: 48, color: Colors.red[300]), | ||
| const SizedBox(height: 16), | ||
| Text( | ||
| _error!, | ||
| style: const TextStyle(color: Colors.white), | ||
| textAlign: TextAlign.center, | ||
| ), | ||
| const SizedBox(height: 16), | ||
| ElevatedButton( | ||
| onPressed: _initializeVideo, | ||
| child: const Text('Retry'), | ||
| ), | ||
| ], | ||
| ), | ||
| ); | ||
| } | ||
|
|
||
| if (_controller?.value.isInitialized ?? false) { | ||
| return Stack( | ||
| alignment: Alignment.center, | ||
| children: <Widget>[ | ||
| AspectRatio( | ||
| aspectRatio: _controller!.value.aspectRatio, | ||
| child: VideoPlayer(_controller!), | ||
| ), | ||
| _buildPlayPauseButton(), | ||
| ], | ||
| ); | ||
| } | ||
|
|
||
| return const Center( | ||
| child: Text('No video loaded', style: TextStyle(color: Colors.white)), | ||
| ); | ||
| } | ||
|
|
||
| Widget _buildPlayPauseButton() { | ||
| return Container( | ||
| decoration: BoxDecoration( | ||
| color: Colors.black54, | ||
| borderRadius: BorderRadius.circular(30), | ||
| ), | ||
| child: IconButton( | ||
| iconSize: 48, | ||
| color: Colors.white, | ||
| onPressed: () { | ||
| if (_controller!.value.isPlaying) { | ||
| _controller!.pause(); | ||
| } else { | ||
| _controller!.play(); | ||
| } | ||
| setState(() {}); | ||
|
There was a problem hiding this comment. why is this setState needed here? Can we listen to the controller? |
||
| }, | ||
| icon: Icon( | ||
| _controller!.value.isPlaying ? Icons.pause : Icons.play_arrow, | ||
| ), | ||
| ), | ||
| ); | ||
| } | ||
|
|
||
| Widget _buildAudioTracksList() { | ||
| return Container( | ||
| padding: const EdgeInsets.all(16.0), | ||
| child: Column( | ||
| crossAxisAlignment: CrossAxisAlignment.start, | ||
| children: <Widget>[ | ||
| Row( | ||
| children: <Widget>[ | ||
| const Icon(Icons.audiotrack), | ||
| const SizedBox(width: 8), | ||
| Text( | ||
| 'Audio Tracks (${_audioTracks.length})', | ||
| style: Theme.of(context).textTheme.headlineSmall, | ||
| ), | ||
| ], | ||
| ), | ||
| const SizedBox(height: 16), | ||
|
|
||
| if (_audioTracks.isEmpty) | ||
| const Expanded( | ||
| child: Center( | ||
| child: Text( | ||
| 'No audio tracks available.\nTry loading a video with multiple audio tracks.', | ||
| textAlign: TextAlign.center, | ||
| style: TextStyle(fontSize: 16, color: Colors.grey), | ||
| ), | ||
| ), | ||
| ) | ||
| else | ||
| Expanded( | ||
| child: ListView.builder( | ||
| itemCount: _audioTracks.length, | ||
| itemBuilder: (BuildContext context, int index) { | ||
| final VideoAudioTrack track = _audioTracks[index]; | ||
| return _buildAudioTrackTile(track); | ||
| }, | ||
| ), | ||
| ), | ||
| ], | ||
| ), | ||
| ); | ||
| } | ||
|
|
||
| Widget _buildAudioTrackTile(VideoAudioTrack track) { | ||
| return Card( | ||
| margin: const EdgeInsets.only(bottom: 8.0), | ||
| child: ListTile( | ||
| leading: CircleAvatar( | ||
| backgroundColor: track.isSelected ? Colors.green : Colors.grey, | ||
| child: Icon( | ||
| track.isSelected ? Icons.check : Icons.audiotrack, | ||
| color: Colors.white, | ||
| ), | ||
| ), | ||
| title: Text( | ||
| track.label.isNotEmpty ? track.label : 'Track ${track.id}', | ||
| style: TextStyle( | ||
| fontWeight: track.isSelected ? FontWeight.bold : FontWeight.normal, | ||
| ), | ||
| ), | ||
| subtitle: Column( | ||
| crossAxisAlignment: CrossAxisAlignment.start, | ||
| children: <Widget>[ | ||
| Text('ID: ${track.id}'), | ||
| Text('Language: ${track.language}'), | ||
| if (track.codec != null) Text('Codec: ${track.codec}'), | ||
| if (track.bitrate != null) Text('Bitrate: ${track.bitrate} bps'), | ||
| if (track.sampleRate != null) | ||
| Text('Sample Rate: ${track.sampleRate} Hz'), | ||
| if (track.channelCount != null) | ||
| Text('Channels: ${track.channelCount}'), | ||
| ], | ||
| ), | ||
| trailing: | ||
| track.isSelected | ||
| ? const Icon(Icons.radio_button_checked, color: Colors.green) | ||
| : const Icon(Icons.radio_button_unchecked), | ||
| onTap: track.isSelected ? null : () => _selectAudioTrack(track.id), | ||
|
There was a problem hiding this comment. The ListTile is going to look like it's disabled when the track is selected. Is that intended? |
||
| ), | ||
| ); | ||
| } | ||
| } | ||
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Would it be possible to use existing videos hosted in the flutter/samples repo (see the other demos), or do they not have tracks? I'm not sure what licenses these samples use.
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
This can be a
constright?