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flutter开发实战-实现音效soundpool播放音频

最近开发过程中遇到低配置设备时候，在Media播放音频时候出现音轨限制问题。所以将部分音频采用音效sound来播放。

一、音效类似iOS中的Sound

在iOS中使用sound来播放mp3音频示例如下

// 通过通知的Sound设置为voip_call.caf，这里播放一段空白音频，音频结束后结束震动NSString *path = [[NSBundle mainBundle] pathForResource:@"blank_call.mp3" ofType:nil];AudioServicesCreateSystemSoundID((__bridge CFURLRef)[NSURL fileURLWithPath:path], &soundID);AudioServicesAddSystemSoundCompletion(soundID, NULL, NULL, soundCompleteCallback, NULL);AudioServicesAddSystemSoundCompletion(kSystemSoundID_Vibrate, NULL, NULL, soundCompleteCallback, NULL);
[self startShakeSound];

/// 开始播放与震动
- (void)startShakeSound {// 声音AudioServicesPlaySystemSound(soundID);// 震动AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
}

/// 结束播放与震动
- (void)stopShakeSound {AudioServicesDisposeSystemSoundID(soundID);AudioServicesRemoveSystemSoundCompletion(soundID);
}

//AudioServicesAddSystemSoundCompletion的回调函数
void soundCompleteCallback(SystemSoundID sound,void * clientData) {if (sound == kSystemSoundID_Vibrate) {AudioServicesPlayAlertSound(sound);//重复响铃震动} else {// 移除AudioServicesDisposeSystemSoundID(sound);AudioServicesRemoveSystemSoundCompletion(sound);AudioServicesDisposeSystemSoundID(kSystemSoundID_Vibrate);AudioServicesRemoveSystemSoundCompletion(kSystemSoundID_Vibrate);}
}

在iOS中通过soundID，可以控制播放与暂停，当然iOS中sound播放完成有通知回调callback。soundpool暂时没找到播放完成回调callback。

二、使用soundpool播放音频

2.1、引入soundpool

在pubspec.yaml中引入

soundpool: ^2.3.0

2.2、使用soundpool来播放音频

Soundpool的初始化要用到SoundpoolOptions

SoundpoolOptions soundpoolOptions = SoundpoolOptions();
_soundpool = Soundpool.fromOptions(options: soundpoolOptions);
_soundId = await _soundpool!.loadUri(url);

播放控制需要使用AudioStreamControl，比如播放、暂停、停止、设置音量等控制操作

• 播放

_audioStreamControl = await _soundpool!.playWithControls(_soundId!);

• 暂停

await _audioStreamControl!.pause();

• 停止

await _audioStreamControl!.stop();

• 设置音量

await _audioStreamControl!.setVolume(volume: volume);

2.3、通过播放时长控制是否可以再次播放

由于soundpool没有播放音频完成回调，这里采用通过Media将音频时长获取到之后判断时间。判断当前播放时间与上次播放的时间间隔是否超过了音频时长Duration。

if (lastPlayMilliseconds == null) {lastPlayMilliseconds = TimeUtil.currentTimeMillis();_audioStreamControl = await _soundpool!.playWithControls(_soundId!);} else {int nowMilliseconds = TimeUtil.currentTimeMillis();bool shouldPlay = true;if (audioDurationInMilliseconds != null) {if (nowMilliseconds - lastPlayMilliseconds! <audioDurationInMilliseconds!) {shouldPlay = false;}}if (shouldPlay) {// 如果上次没有播放完成，不进行播放// 通过判断播放时长_audioStreamControl = await _soundpool!.playWithControls(_soundId!);lastPlayMilliseconds = nowMilliseconds;}}

整体使用soundpool播放音频的相关代码如下

import 'package:soundpool/soundpool.dart';// 使用SoundPool
class SoundPlayer implements BaseAudioPlayer {// AudioStreamControl// SoundpoolSoundpool? _soundpool;String? audioUrl;// 上次播放时长的毫秒数int? lastPlayMilliseconds;// 时长int? audioDurationInMilliseconds;// 优先级late AudioConfig __audioConfig;late bool _playing = false; // 是否正在播放int? _soundId;AudioStreamControl? _audioStreamControl;SoundPlayer(this.__audioConfig, {Duration? duration}) {if (duration != null) {audioDurationInMilliseconds = duration!.inMilliseconds;}print("SoundPlayer audioDurationInMilliseconds:${audioDurationInMilliseconds}");SoundpoolOptions soundpoolOptions = SoundpoolOptions();_soundpool = Soundpool.fromOptions(options: soundpoolOptions);setAudioUrl(__audioConfig.audioUrl);}Future<void> setAudioUrl(String url) async {if (_soundpool != null) {_soundId = await _soundpool!.loadUri(url);}}AudioConfig get_audioConfig() {return __audioConfig;}@overridevoid play() async {// Usually you don't want to wait for playback to finish.if (__audioConfig.audioUrl != null &&__audioConfig.audioUrl.isNotEmpty &&_soundId != null &&_soundpool != null) {if (lastPlayMilliseconds == null) {lastPlayMilliseconds = TimeUtil.currentTimeMillis();_audioStreamControl = await _soundpool!.playWithControls(_soundId!);} else {int nowMilliseconds = TimeUtil.currentTimeMillis();bool shouldPlay = true;if (audioDurationInMilliseconds != null) {if (nowMilliseconds - lastPlayMilliseconds! <audioDurationInMilliseconds!) {shouldPlay = false;}}if (shouldPlay) {// 如果上次没有播放完成，不进行播放// 通过判断播放时长_audioStreamControl = await _soundpool!.playWithControls(_soundId!);lastPlayMilliseconds = nowMilliseconds;}}}}@overridevoid pause() async {if (__audioConfig.audioUrl != null &&__audioConfig.audioUrl.isNotEmpty &&_audioStreamControl != null) {try {await _audioStreamControl!.pause();} catch(e) {print("audioStreamControl pause e:${e.toString()}");}}}@overridevoid stop() async {if (__audioConfig.audioUrl != null &&__audioConfig.audioUrl.isNotEmpty &&_audioStreamControl != null) {try {await _audioStreamControl!.stop();} catch(e) {print("audioStreamControl stop e:${e.toString()}");}}}@overridevoid setVolume(double volume) async {if (__audioConfig.audioUrl != null &&__audioConfig.audioUrl.isNotEmpty &&_audioStreamControl != null) {try {await _audioStreamControl!.setVolume(volume: volume);} catch(e) {print("audioStreamControl setVolume e:${e.toString()}");}}}// 不需要该播放器，则需要调用该方法@overridevoid dispose() {if (_soundpool != null) {_soundpool!.dispose();}}
}

三、小结

flutter开发实战-实现音效soundpool播放音频及控制播放、暂停、停止、设置音量等控制操作。

学习记录，每天不停进步。