light_compressor 0.0.3

A powerful and easy-to-use video compression plugin for Flutter.

example/lib/main.dart

import 'dart:async';
import 'dart:io';
import 'dart:typed_data';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

import 'package:ext_storage/ext_storage.dart';
import 'package:path_provider/path_provider.dart' as path;
import 'package:image_picker/image_picker.dart';
import 'package:light_compressor/light_compressor.dart';
import 'package:video_thumbnail/video_thumbnail.dart';

import 'package:light_compressor_example/utils/file_utils.dart';
import 'package:light_compressor_example/video_player.dart';

void main() {
  runApp(MyApp());
}

/// A widget that uses LightCompressor library to compress videos
class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  final ImagePicker _picker = ImagePicker();
  PickedFile _file;
  String _desFile;
  bool _isVideoCompressed = false;
  String _displayedFile;
  int _duration;
  String _failureMessage;

  @override
  Widget build(BuildContext context) => MaterialApp(
        theme: ThemeData(
          primaryColor: const Color(0xFF344772),
          accentColor: const Color(0xFF6272a1),
          primaryColorDark: const Color(0xFF002046),
        ),
        home: Scaffold(
          appBar: AppBar(
            title: const Text('Compressor Sample'),
            actions: <Widget>[
              FlatButton(
                child: const Text(
                  'Cancel',
                  style: TextStyle(color: Colors.white, fontSize: 18),
                ),
                onPressed: () => LightCompressor.cancelCompression(),
              )
            ],
          ),
          body: Container(
            margin: const EdgeInsets.all(16),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: <Widget>[
                if (_displayedFile != null)
                  Builder(
                    builder: (BuildContext context) => InkWell(
                      child: Stack(
                        children: <Widget>[
                          FutureBuilder<Uint8List>(
                              future: _getVideoThumbnail(path: _displayedFile),
                              builder: (BuildContext context,
                                  AsyncSnapshot<Uint8List> thumbnailFile) {
                                if (thumbnailFile.data != null) {
                                  return Image.memory(
                                    thumbnailFile.data,
                                    height: 240,
                                    width: double.infinity,
                                  );
                                } else {
                                  return const SizedBox.shrink();
                                }
                              }),
                          const Positioned.fill(
                            child: Align(
                              child: Icon(
                                Icons.play_circle_outline,
                                color: Colors.white,
                                size: 42,
                              ),
                            ),
                          ),
                        ],
                      ),
                      onTap: () {
                        Navigator.push<dynamic>(
                          context,
                          MaterialPageRoute<dynamic>(
                            builder: (_) => VideoPlayerScreen(
                              path: _desFile,
                            ),
                          ),
                        );
                      },
                    ),
                  ),
                const SizedBox(height: 16),
                if (_file != null)
                  Text(
                    'Original size: ${_getVideoSize(file: File(_file.path))}',
                    style: const TextStyle(fontSize: 16),
                  ),
                const SizedBox(height: 8),
                if (_isVideoCompressed)
                  Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: <Widget>[
                      Text(
                        'Size after compression: ${_getVideoSize(file: File(_desFile))}',
                        style: const TextStyle(fontSize: 16),
                      ),
                      const SizedBox(height: 8),
                      Text(
                        'Duration: $_duration seconds',
                        style: const TextStyle(fontSize: 16, color: Colors.red),
                      ),
                    ],
                  ),
                const SizedBox(height: 16),
                Visibility(
                  visible: !_isVideoCompressed,
                  child: StreamBuilder<dynamic>(
                      stream: LightCompressor.progressStream
                          .receiveBroadcastStream(),
                      builder: (BuildContext context,
                          AsyncSnapshot<dynamic> snapshot) {
                        if (snapshot.data != null && snapshot.data > 0) {
                          return Column(
                            children: <Widget>[
                              LinearProgressIndicator(
                                minHeight: 8,
                                value: snapshot.data / 100,
                              ),
                              const SizedBox(height: 8),
                              Text(
                                '${snapshot.data.toStringAsFixed(0)}%',
                                style: const TextStyle(fontSize: 20),
                              )
                            ],
                          );
                        }
                        return const SizedBox.shrink();
                      }),
                ),
                Text(
                  _failureMessage ?? '',
                )
              ],
            ),
          ),
          floatingActionButton: FloatingActionButton.extended(
            onPressed: () => _pickVideo(),
            label: const Text('Pick Video'),
            icon: const Icon(Icons.video_library),
            backgroundColor: const Color(0xFFA52A2A),
          ),
        ),
      );

  // Pick a video form device's storage
  Future<void> _pickVideo() async {
    _isVideoCompressed = false;
    _file = await _picker.getVideo(source: ImageSource.gallery);

    if (_file == null) {
      return;
    }

    setState(() {
      _displayedFile = _file.path;
      _failureMessage = null;
    });

    _desFile = await _destinationFile;
    final Stopwatch stopwatch = Stopwatch()..start();
    final Map<String, dynamic> response = await LightCompressor.compressVideo(
        path: _file.path.toString(),
        destinationPath: _desFile,
        videoQuality: VideoQuality.medium,
        isMinBitRateEnabled: false,
        keepOriginalResolution: false);

    stopwatch.stop();
    final Duration duration =
        Duration(milliseconds: stopwatch.elapsedMilliseconds);
    _duration = duration.inSeconds;

    if (response['onSuccess'] != null) {
      _desFile = response['onSuccess'];

      setState(() {
        _displayedFile = _desFile;
        _isVideoCompressed = true;
      });
    } else if (response['onFailure'] != null) {
      print(response['onFailure']);
      setState(() {
        _failureMessage = response['onFailure'];
      });
    } else if (response['onCancelled'] != null) {
      print(response['onCancelled']);
    }
  }
}

Future<String> get _destinationFile async {
  String directory;
  final String videoName = '${DateTime.now().millisecondsSinceEpoch}.mp4';
  if (Platform.isAndroid) {
    directory = await ExtStorage.getExternalStoragePublicDirectory(
        ExtStorage.DIRECTORY_MOVIES);
    return File('$directory/$videoName').path;
  } else {
    final Directory dir = await path.getLibraryDirectory();
    directory = dir.path;
    return File('$directory/$videoName').path;
  }
}

String _getVideoSize({@required File file}) =>
    formatBytes(file.lengthSync(), 2);

Future<Uint8List> _getVideoThumbnail({@required String path}) async {
  try {
    return await VideoThumbnail.thumbnailData(
      video: path,
      imageFormat: ImageFormat.JPEG,
      quality: 100,
    );
  } on PlatformException catch (_) {
    return Future<Uint8List>.value();
  }
}