[video_player] Adds audio track metadata fetching and audio track selection feature #9925
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| // 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. | ||
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| import 'package:flutter/material.dart'; | ||
| import 'package:video_player/video_player.dart'; | ||
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| /// A demo page that showcases audio track functionality. | ||
| class AudioTracksDemo extends StatefulWidget { | ||
| const AudioTracksDemo({super.key}); | ||
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| @override | ||
| State<AudioTracksDemo> createState() => _AudioTracksDemoState(); | ||
| } | ||
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| class _AudioTracksDemoState extends State<AudioTracksDemo> { | ||
| VideoPlayerController? _controller; | ||
| List<VideoAudioTrack> _audioTracks = []; | ||
| bool _isLoading = false; | ||
| String? _error; | ||
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| // Sample video URLs with multiple audio tracks | ||
| final List<String> _sampleVideos = [ | ||
| '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', | ||
| ]; | ||
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| int _selectedVideoIndex = 0; | ||
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| @override | ||
| void initState() { | ||
| super.initState(); | ||
| _initializeVideo(); | ||
| } | ||
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| Future<void> _initializeVideo() async { | ||
| setState(() { | ||
| _isLoading = true; | ||
| _error = null; | ||
| }); | ||
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| try { | ||
| await _controller?.dispose(); | ||
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| _controller = VideoPlayerController.networkUrl( | ||
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| Uri.parse(_sampleVideos[_selectedVideoIndex]), | ||
| ); | ||
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| await _controller!.initialize(); | ||
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| // Get audio tracks after initialization | ||
| await _loadAudioTracks(); | ||
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| setState(() { | ||
| _isLoading = false; | ||
| }); | ||
| } catch (e) { | ||
| setState(() { | ||
| _error = 'Failed to initialize video: $e'; | ||
| _isLoading = false; | ||
| }); | ||
| } | ||
| } | ||
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| Future<void> _loadAudioTracks() async { | ||
| if (_controller == null || !_controller!.value.isInitialized) return; | ||
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| try { | ||
| final tracks = await _controller!.getAudioTracks(); | ||
| setState(() { | ||
| _audioTracks = tracks; | ||
| }); | ||
| } catch (e) { | ||
| setState(() { | ||
| _error = 'Failed to load audio tracks: $e'; | ||
| }); | ||
| } | ||
| } | ||
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| Future<void> _selectAudioTrack(String trackId) async { | ||
| if (_controller == null) return; | ||
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| try { | ||
| await _controller!.selectAudioTrack(trackId); | ||
| // Reload tracks to update selection status | ||
| await _loadAudioTracks(); | ||
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| ScaffoldMessenger.of( | ||
| context, | ||
| ).showSnackBar(SnackBar(content: Text('Selected audio track: $trackId'))); | ||
| } catch (e) { | ||
| ScaffoldMessenger.of(context).showSnackBar( | ||
| SnackBar(content: Text('Failed to select audio track: $e')), | ||
| ); | ||
| } | ||
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| } | ||
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| @override | ||
| void dispose() { | ||
| _controller?.dispose(); | ||
| super.dispose(); | ||
| } | ||
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| @override | ||
| Widget build(BuildContext context) { | ||
| return Scaffold( | ||
| appBar: AppBar( | ||
| title: const Text('Audio Tracks Demo'), | ||
| backgroundColor: Theme.of(context).colorScheme.inversePrimary, | ||
| ), | ||
| body: Column( | ||
| children: [ | ||
| // Video selection dropdown | ||
| Padding( | ||
| padding: const EdgeInsets.all(16.0), | ||
| child: DropdownButtonFormField<int>( | ||
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| value: _selectedVideoIndex, | ||
| decoration: const InputDecoration( | ||
| labelText: 'Select Video', | ||
| border: OutlineInputBorder(), | ||
| ), | ||
| items: | ||
| _sampleVideos.asMap().entries.map((entry) { | ||
| return DropdownMenuItem<int>( | ||
| value: entry.key, | ||
| child: Text('Video ${entry.key + 1}'), | ||
| ); | ||
| }).toList(), | ||
| onChanged: (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 |
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| setState(() { | ||
| _selectedVideoIndex = value; | ||
| }); | ||
| _initializeVideo(); | ||
| } | ||
| }, | ||
| ), | ||
| ), | ||
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| // Video player | ||
| Expanded( | ||
| flex: 2, | ||
| child: Container(color: Colors.black, child: _buildVideoPlayer()), | ||
| ), | ||
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| // Audio tracks list | ||
| Expanded(flex: 3, child: _buildAudioTracksList()), | ||
| ], | ||
| ), | ||
| floatingActionButton: FloatingActionButton( | ||
| onPressed: _loadAudioTracks, | ||
| tooltip: 'Refresh Audio Tracks', | ||
| child: const Icon(Icons.refresh), | ||
| ), | ||
| ); | ||
| } | ||
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| Widget _buildVideoPlayer() { | ||
| if (_isLoading) { | ||
| return const Center(child: CircularProgressIndicator()); | ||
| } | ||
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| if (_error != null) { | ||
|
There was a problem hiding this comment. nit: |
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| return Center( | ||
| child: Column( | ||
| mainAxisAlignment: MainAxisAlignment.center, | ||
| children: [ | ||
| 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'), | ||
| ), | ||
| ], | ||
| ), | ||
| ); | ||
| } | ||
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| if (_controller?.value.isInitialized == true) { | ||
| return Stack( | ||
| alignment: Alignment.center, | ||
| children: [ | ||
| AspectRatio( | ||
| aspectRatio: _controller!.value.aspectRatio, | ||
| child: VideoPlayer(_controller!), | ||
| ), | ||
| _buildPlayPauseButton(), | ||
| ], | ||
| ); | ||
| } | ||
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| return const Center( | ||
| child: Text('No video loaded', style: TextStyle(color: Colors.white)), | ||
| ); | ||
| } | ||
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| 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(() {}); | ||
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| }, | ||
| icon: Icon( | ||
| _controller!.value.isPlaying ? Icons.pause : Icons.play_arrow, | ||
| ), | ||
| ), | ||
| ); | ||
| } | ||
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| Widget _buildAudioTracksList() { | ||
| return Container( | ||
| padding: const EdgeInsets.all(16.0), | ||
| child: Column( | ||
| crossAxisAlignment: CrossAxisAlignment.start, | ||
| children: [ | ||
| Row( | ||
| children: [ | ||
| const Icon(Icons.audiotrack), | ||
| const SizedBox(width: 8), | ||
| Text( | ||
| 'Audio Tracks (${_audioTracks.length})', | ||
| style: Theme.of(context).textTheme.headlineSmall, | ||
| ), | ||
| ], | ||
| ), | ||
| const SizedBox(height: 16), | ||
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| 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: (context, index) { | ||
| final track = _audioTracks[index]; | ||
| return _buildAudioTrackTile(track); | ||
| }, | ||
| ), | ||
| ), | ||
| ], | ||
| ), | ||
| ); | ||
| } | ||
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| 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: [ | ||
| 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), | ||
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|
||
| ), | ||
| ); | ||
| } | ||
| } | ||
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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.
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This can be a
constright?There was a problem hiding this comment.
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I tried to find if such urls are there in flutter/samples but coudn't find it.