490 lines
16 KiB
Dart
490 lines
16 KiB
Dart
import 'dart:async';
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import 'dart:math';
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import 'dart:typed_data';
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import 'dart:ui';
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import 'package:aves/model/entry.dart';
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import 'package:aves/model/settings/settings.dart';
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import 'package:aves/model/settings/video_loop_mode.dart';
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import 'package:aves/model/video/keys.dart';
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import 'package:aves/model/video/metadata.dart';
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import 'package:aves/utils/change_notifier.dart';
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import 'package:aves/widgets/viewer/video/controller.dart';
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import 'package:collection/collection.dart';
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import 'package:fijkplayer/fijkplayer.dart';
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import 'package:flutter/foundation.dart';
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import 'package:flutter/material.dart';
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class IjkPlayerAvesVideoController extends AvesVideoController {
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late FijkPlayer _instance;
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final List<StreamSubscription> _subscriptions = [];
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final StreamController<FijkValue> _valueStreamController = StreamController.broadcast();
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final StreamController<String?> _timedTextStreamController = StreamController.broadcast();
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final AChangeNotifier _completedNotifier = AChangeNotifier();
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Offset _macroBlockCrop = Offset.zero;
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final List<StreamSummary> _streams = [];
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Timer? _initialPlayTimer;
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double _speed = 1;
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// audio/video get out of sync with speed < .5
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// the video stream plays at .5 but the audio is slowed as requested
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@override
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final double minSpeed = .5;
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// ijkplayer configures `AudioTrack` buffer for a maximum speed of 2
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@override
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final double maxSpeed = 2;
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@override
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final ValueNotifier<bool> canCaptureFrameNotifier = ValueNotifier(false);
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@override
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final ValueNotifier<bool> canSetSpeedNotifier = ValueNotifier(false);
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@override
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final ValueNotifier<bool> canSelectStreamNotifier = ValueNotifier(false);
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@override
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final ValueNotifier<double> sarNotifier = ValueNotifier(1);
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Stream<FijkValue> get _valueStream => _valueStreamController.stream;
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static const initialPlayDelay = Duration(milliseconds: 100);
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static const gifLikeVideoDurationThreshold = Duration(seconds: 10);
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static const gifLikeBitRateThreshold = 2 << 18; // 512kB/s (4Mb/s)
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IjkPlayerAvesVideoController(AvesEntry entry) : super(entry) {
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_instance = FijkPlayer();
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_valueStream.map((value) => value.videoRenderStart).firstWhere((v) => v, orElse: () => false).then(
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(started) => canCaptureFrameNotifier.value = started,
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onError: (error) {},
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);
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_valueStream.map((value) => value.audioRenderStart).firstWhere((v) => v, orElse: () => false).then(
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(started) => canSetSpeedNotifier.value = started,
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onError: (error) {},
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);
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_startListening();
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}
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@override
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Future<void> dispose() async {
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_initialPlayTimer?.cancel();
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_stopListening();
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await _valueStreamController.close();
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await _timedTextStreamController.close();
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await _instance.release();
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}
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void _startListening() {
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_instance.addListener(_onValueChanged);
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_subscriptions.add(_valueStream.where((value) => value.state == FijkState.completed).listen((_) => _completedNotifier.notifyListeners()));
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_subscriptions.add(_instance.onTimedText.listen(_timedTextStreamController.add));
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}
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void _stopListening() {
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_instance.removeListener(_onValueChanged);
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_subscriptions
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..forEach((sub) => sub.cancel())
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..clear();
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}
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Future<void> _init({int startMillis = 0}) async {
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sarNotifier.value = 1;
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_applyOptions(startMillis);
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// calling `setDataSource()` with `autoPlay` starts as soon as possible, but often yields initial artifacts
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// so we introduce a small delay after the player is declared `prepared`, before playing
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await _instance.setDataSourceUntilPrepared(entry.uri);
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if (speed != 1) {
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_applySpeed();
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}
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_initialPlayTimer = Timer(initialPlayDelay, play);
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}
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void _applyOptions(int startMillis) {
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// FFmpeg options
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// cf https://github.com/Bilibili/ijkplayer/blob/master/ijkmedia/ijkplayer/ff_ffplay_options.h
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// cf https://www.jianshu.com/p/843c86a9e9ad
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// cf https://www.jianshu.com/p/3649c073b346
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final options = FijkOption();
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// when accurate seek is enabled and seeking fails, it takes time (cf `accurate-seek-timeout`) to acknowledge the error and proceed
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// failure seems to happen when pause-seeking videos with an audio stream, whatever container or video stream
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// player cannot be dynamically set to use accurate seek only when playing
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const accurateSeekEnabled = false;
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// playing with HW acceleration seems to skip the last frames of some videos
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// so HW acceleration is always disabled for GIF-like videos where the last frames may be significant
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final hwAccelerationEnabled = settings.enableVideoHardwareAcceleration && !_isGifLike();
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// TODO TLAD [video] flaky: HW codecs sometimes fail when seek-starting some videos, e.g. MP2TS/h264(HDPR)
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if (hwAccelerationEnabled) {
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// when HW acceleration is enabled, videos with dimensions that do not fit 16x macroblocks need cropping
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// TODO TLAD [video] flaky: not all formats/devices need this correction, e.g. 498x278 MP4 on S7, 408x244 WEBM on S10e do not
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final s = entry.displaySize % 16 * -1 % 16;
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_macroBlockCrop = Offset(s.width, s.height);
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}
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final loopEnabled = settings.videoLoopMode.shouldLoop(entry);
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// `fastseek`: enable fast, but inaccurate seeks for some formats
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// in practice the flag seems ineffective, but harmless too
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options.setFormatOption('fflags', 'fastseek');
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// `enable-snapshot`: enable snapshot interface
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// default: 0, in [0, 1]
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// cf https://fijkplayer.befovy.com/docs/zh/host-option.html
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// there is a performance cost, and it should be set up before playing
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options.setHostOption('enable-snapshot', 1);
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// `accurate-seek-timeout`: accurate seek timeout
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// default: 5000 ms, in [0, 5000]
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options.setPlayerOption('accurate-seek-timeout', 1000);
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// `cover-after-prepared`: show cover provided to `FijkView` when player is `prepared` without auto play
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// default: 0, in [0, 1]
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options.setPlayerOption('cover-after-prepared', 0);
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// `enable-accurate-seek`: enable accurate seek
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// default: 0, in [0, 1]
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options.setPlayerOption('enable-accurate-seek', accurateSeekEnabled ? 1 : 0);
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// `min-frames`: minimal frames to stop pre-reading
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// default: 50000, in [2, 50000]
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// a comment in `IjkMediaPlayer.java` recommends setting this to 25 when de/selecting streams
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options.setPlayerOption('min-frames', 25);
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// `framedrop`: drop frames when cpu is too slow
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// default: 0, in [-1, 120]
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options.setPlayerOption('framedrop', 5);
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// `loop`: set number of times the playback shall be looped
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// default: 1, in [INT_MIN, INT_MAX]
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options.setPlayerOption('loop', loopEnabled ? -1 : 1);
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// `mediacodec-all-videos`: MediaCodec: enable all videos
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// default: 0, in [0, 1]
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options.setPlayerOption('mediacodec-all-videos', hwAccelerationEnabled ? 1 : 0);
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// `seek-at-start`: set offset of player should be seeked
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// default: 0, in [0, INT_MAX]
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options.setPlayerOption('seek-at-start', startMillis);
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// `soundtouch`: enable SoundTouch
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// default: 0, in [0, 1]
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// `SoundTouch` cannot be enabled/disabled after video is `prepared`
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// When `SoundTouch` is enabled:
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// - slowed down videos have a weird wobbly audio
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// - we can set speeds higher than the `AudioTrack` limit of 2
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options.setPlayerOption('soundtouch', 0);
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// `subtitle`: decode subtitle stream
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// default: 0, in [0, 1]
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options.setPlayerOption('subtitle', 1);
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_instance.applyOptions(options);
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}
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bool _isGifLike() {
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// short
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final durationSecs = (entry.durationMillis ?? 0) ~/ 1000;
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if (durationSecs == 0) return false;
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if (durationSecs > gifLikeVideoDurationThreshold.inSeconds) return false;
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// light
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final sizeBytes = entry.sizeBytes;
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if (sizeBytes == null) return false;
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if (sizeBytes / durationSecs > gifLikeBitRateThreshold) return false;
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return true;
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}
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void _fetchStreams() async {
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final mediaInfo = await _instance.getInfo();
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if (!mediaInfo.containsKey(Keys.streams)) return;
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var videoStreamCount = 0, audioStreamCount = 0, textStreamCount = 0;
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_streams.clear();
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final allStreams = (mediaInfo[Keys.streams] as List).cast<Map>();
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allStreams.forEach((stream) {
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final type = ExtraStreamType.fromTypeString(stream[Keys.streamType]);
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if (type != null) {
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final width = stream[Keys.width] as int?;
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final height = stream[Keys.height] as int?;
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_streams.add(StreamSummary(
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type: type,
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index: stream[Keys.index],
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codecName: stream[Keys.codecName],
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language: stream[Keys.language],
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title: stream[Keys.title],
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width: width,
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height: height,
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));
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switch (type) {
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case StreamType.video:
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// check width/height to exclude image streams (that are included among video streams)
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if (width != null && height != null) {
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videoStreamCount++;
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}
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break;
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case StreamType.audio:
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audioStreamCount++;
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break;
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case StreamType.text:
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textStreamCount++;
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break;
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}
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}
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});
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canSelectStreamNotifier.value = videoStreamCount > 1 || audioStreamCount > 1 || textStreamCount > 0;
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final selectedVideo = await getSelectedStream(StreamType.video);
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if (selectedVideo != null) {
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final streamIndex = selectedVideo.index;
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final streamInfo = allStreams.firstWhereOrNull((stream) => stream[Keys.index] == streamIndex);
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if (streamInfo != null) {
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final num = streamInfo[Keys.sarNum] ?? 0;
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final den = streamInfo[Keys.sarDen] ?? 0;
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sarNotifier.value = (num != 0 ? num : 1) / (den != 0 ? den : 1);
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}
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}
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}
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void _onValueChanged() {
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if (_instance.state == FijkState.prepared && _streams.isEmpty) {
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_fetchStreams();
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}
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_valueStreamController.add(_instance.value);
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}
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@override
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Future<void> play() async {
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if (isReady) {
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await _instance.start();
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} else {
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await _init();
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}
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}
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@override
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Future<void> pause() async {
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if (isReady) {
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_initialPlayTimer?.cancel();
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await _instance.pause();
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}
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}
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@override
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Future<void> seekTo(int targetMillis) async {
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targetMillis = max(0, targetMillis);
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if (isReady) {
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await _instance.seekTo(targetMillis);
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} else {
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// always start playing, even when seeking on uninitialized player, otherwise the texture is not updated
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// as a workaround, pausing after a brief duration is possible, but fiddly
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await _init(startMillis: targetMillis);
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}
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}
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@override
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Listenable get playCompletedListenable => _completedNotifier;
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@override
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VideoStatus get status => _instance.state.toAves;
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@override
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Stream<VideoStatus> get statusStream => _valueStream.map((value) => value.state.toAves);
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@override
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bool get isReady => _instance.isPlayable();
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@override
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int get duration {
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final controllerDuration = _instance.value.duration.inMilliseconds;
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// use expected duration when controller duration is not set yet
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return controllerDuration == 0 ? (entry.durationMillis ?? 0) : controllerDuration;
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}
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@override
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int get currentPosition => _instance.currentPos.inMilliseconds;
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@override
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Stream<int> get positionStream => _instance.onCurrentPosUpdate.map((pos) => pos.inMilliseconds);
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@override
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Stream<String?> get timedTextStream => _timedTextStreamController.stream;
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@override
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double get speed => _speed;
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@override
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set speed(double speed) {
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if (speed <= 0 || _speed == speed) return;
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_speed = speed;
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_applySpeed();
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}
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// TODO TLAD [video] bug: setting speed fails when there is no audio stream or audio is disabled
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void _applySpeed() => _instance.setSpeed(speed);
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// When a stream is selected, the video accelerates to catch up with it.
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// The duration of this acceleration phase depends on the player `min-frames` parameter.
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// Calling `seekTo` after stream de/selection is a workaround to:
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// 1) prevent video stream acceleration to catch up with audio
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// 2) apply timed text stream
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@override
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Future<void> selectStream(StreamType type, StreamSummary? selected) async {
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final current = await getSelectedStream(type);
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if (current != selected) {
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if (selected != null) {
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final newIndex = selected.index;
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if (newIndex != null) {
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await _instance.selectTrack(newIndex);
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}
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} else if (current != null) {
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await _instance.deselectTrack(current.index!);
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}
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if (type == StreamType.text) {
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_timedTextStreamController.add(null);
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}
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await seekTo(currentPosition);
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}
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}
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@override
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Future<StreamSummary?> getSelectedStream(StreamType type) async {
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final currentIndex = await _instance.getSelectedTrack(type.code);
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return currentIndex != -1 ? _streams.firstWhereOrNull((v) => v.index == currentIndex) : null;
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}
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@override
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List<StreamSummary> get streams => _streams;
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@override
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Future<Uint8List> captureFrame() {
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if (!_instance.value.videoRenderStart) {
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return Future.error('cannot capture frame when video is not rendered');
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}
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return _instance.takeSnapShot();
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}
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@override
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Widget buildPlayerWidget(BuildContext context) {
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return ValueListenableBuilder<double>(
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valueListenable: sarNotifier,
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builder: (context, sar, child) {
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// derive DAR (Display Aspect Ratio) from SAR (Storage Aspect Ratio), if any
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// e.g. 960x536 (~16:9) with SAR 4:3 should be displayed as ~2.39:1
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final dar = entry.displayAspectRatio * sar;
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return FijkView(
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player: _instance,
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fit: FijkFit(
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sizeFactor: 1.0,
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aspectRatio: dar,
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alignment: _alignmentForRotation(entry.rotationDegrees),
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macroBlockCrop: _macroBlockCrop,
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),
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panelBuilder: (player, data, context, viewSize, texturePos) => const SizedBox(),
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color: Colors.transparent,
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);
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});
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}
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Alignment _alignmentForRotation(int rotation) {
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switch (rotation) {
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case 90:
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return Alignment.topRight;
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case 180:
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return Alignment.bottomRight;
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case 270:
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return Alignment.bottomLeft;
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case 0:
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default:
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return Alignment.topLeft;
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}
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}
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}
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extension ExtraIjkStatus on FijkState {
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VideoStatus get toAves {
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switch (this) {
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case FijkState.idle:
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case FijkState.end:
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case FijkState.stopped:
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return VideoStatus.idle;
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case FijkState.initialized:
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case FijkState.asyncPreparing:
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return VideoStatus.initialized;
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case FijkState.prepared:
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case FijkState.paused:
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return VideoStatus.paused;
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case FijkState.started:
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return VideoStatus.playing;
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case FijkState.completed:
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return VideoStatus.completed;
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case FijkState.error:
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return VideoStatus.error;
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}
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}
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}
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extension ExtraFijkPlayer on FijkPlayer {
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Future<void> setDataSourceUntilPrepared(String uri) async {
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await setDataSource(uri, autoPlay: false, showCover: false);
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final completer = Completer();
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void onChange() {
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switch (state) {
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case FijkState.prepared:
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removeListener(onChange);
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completer.complete();
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break;
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case FijkState.error:
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removeListener(onChange);
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completer.completeError(value.exception);
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break;
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default:
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break;
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}
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}
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addListener(onChange);
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await prepareAsync();
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return completer.future;
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}
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}
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extension ExtraStreamType on StreamType {
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static StreamType? fromTypeString(String? type) {
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switch (type) {
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case StreamTypes.video:
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return StreamType.video;
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case StreamTypes.audio:
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return StreamType.audio;
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case StreamTypes.subtitle:
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case StreamTypes.timedText:
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return StreamType.text;
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default:
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return null;
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}
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}
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int get code {
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// codes from ijkplayer ITrackInfo.java
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switch (this) {
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case StreamType.video:
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return 1;
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case StreamType.audio:
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return 2;
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case StreamType.text:
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// TIMEDTEXT = 3, SUBTITLE = 4
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return 3;
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default:
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// METADATA = 5, UNKNOWN = 0
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return 0;
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}
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}
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}
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