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Flash Player 10.1 终实现本地线上录制MP3

发布时间：2020-12-15 17:54:27 所属栏目：百科 来源：网络整理
导读：http://www.cnblogs.com/holybozo/archive/2010/06/26/1765943.html ? Flash Player 10.1 可以获取麦克风数据了，所以可以实现本地录音。（不知道啥时候Adobe能开发本路录像，估计怕FMS卖不掉？） 但光凭FP10.1，只能实现即录即放，没法保存。如果要保存，又

http://www.cnblogs.com/holybozo/archive/2010/06/26/1765943.html

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Flash Player 10.1 可以获取麦克风数据了，所以可以实现本地录音。（不知道啥时候Adobe能开发本路录像，估计怕FMS卖不掉？）

但光凭FP10.1，只能实现即录即放，没法保存。如果要保存，又是另外一个课题了——音频编码。

adobe这篇文章里提供了一个WAVWriter，可以把ByteArray转成WAV文件。执行起来是同步的，效率上还不错，因为wav本身就是无损格式，也正因为如此，保存成wav文件太大，总归不太好。理想的是MP3...

Thibault Imbert利用AIR2的新特性，可以运行一个本地程序，这样调用鼎鼎大名的Lame来转MP3就OK了。

借用AIR还不够让人兴奋，因为这和在线项目无缘。那么利用Alchemy打包Lame呢？这个想法近似疯狂，但却衍生出一个靠谱的方法。

Shine MP3 Encoder on Alchemy

是用Alchemy打包了一个叫8hz-MP3的轻量级MP3编码器，这样一来就能够脱离AIR实现WAV转MP3了。

作者提供了swc，加上之前adobe提供的WAVWriter，组合起来写了一个保存录音的demo。

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package
{
???? import com.adobe.audio.format.WAVWriter;
???? import flash.display.Sprite;
???? import flash.display.StageScaleMode;
???? import flash.events.ErrorEvent;
???? import flash.events.Event;
???? import flash.events.KeyboardEvent;
???? import flash.events.ProgressEvent;
???? import flash.events.SampleDataEvent;
???? import flash.media.Microphone;
???? import flash.media.Sound;
???? import flash.text.TextField;
???? import flash.utils.ByteArray;
???? import flash.utils.getTimer;
???? import fr.kikko.lab.ShineMP3Encoder;
?????
???? /**
????? * ...
????? * @author hbb
????? */
???? public class Main extends Sprite
???? {
???????? private var _mic:Microphone;
???????? private var _voice:ByteArray;
???????? private var _mp3Encoder:ShineMP3Encoder;
?????????
???????? private var _state: String ;
???????? private var _timer: int ;
?????????
?????????
???????? public function Main(): void
???????? {
???????????? if (stage) init();
???????????? else addEventListener(Event.ADDED_TO_STAGE,onAddedToStage);
???????? }
?????????
???????? private function onAddedToStage(e:Event): void
???????? {
???????????? removeEventListener(Event.ADDED_TO_STAGE,onAddedToStage);
???????????? init();
???????? }
?????????
???????? private function init(): void
???????? {
???????????? stage.scaleMode = StageScaleMode.NO_SCALE;
???????????? stage.stageFocusRect = false ;
?????????????
???????????? if (!setupMicrophone()) return ;
?????????????
???????????? stage.addEventListener(KeyboardEvent.KEY_UP,commandHandler);
?????????????
???????????? _state = 'pre-recording' ;
?????????????
???????????? log( 'press <key>: <r>ecord' );
???????? }
?????????
???????? private function setupMicrophone(): Boolean
???????? {
???????????? _mic = Microphone.getMicrophone();
???????????? if (!_mic) { log( 'no michrophone!' ); return false ; }
?????????????
???????????? _mic.rate = 44 ;
???????????? _mic.setSilenceLevel( 0 , 1000 );
???????????? _mic.setLoopBack( true );
???????????? _mic.setUseEchoSuppression( true );
???????????? return true ;
???????? }
?????????
???????? private function commandHandler(e:KeyboardEvent): void
???????? {
???????????? switch ( String .fromCharCode(e.charCode))
???????????? {
???????????????? case 'r' :
???????????????????? startRecording();
???????????????????? break ;
?????????????????????
???????????????? case 'e' :
???????????????????? stopAndEncodeRecording();
???????????????????? break ;
?????????????????????
???????????????? case 's' :
???????????????????? saveMP3();
???????????????????? break ;
???????????? }
???????? }
?????????
???????? private function saveMP3(): void
???????? {
???????????? if (_state != 'encoded' ) return ;
?????????????
???????????? _mp3Encoder.saveAs();
???????????? _state = 'pre-recording' ;
???????? }
?????????
???????? private function startRecording(): void
???????? {
???????????? if (_state != 'pre-recording' && _state != 'encoded' ) return ;
?????????????
???????????? log( 'press <key>: stop and <e>ncode recording' );
?????????????
???????????? _state = 'pre-encoding' ;
???????????? _voice = new ByteArray();
???????????? _mic.addEventListener(SampleDataEvent.SAMPLE_DATA,onRecord);
???????? }
?????????
???????? private function stopAndEncodeRecording(): void
???????? {
???????????? if (_state != 'pre-encoding' ) return ;
?????????????
???????????? _state = 'encoding' ;
???????????? _mic.removeEventListener(SampleDataEvent.SAMPLE_DATA,onRecord);
?????????????
???????????? _voice.position = 0 ;
?????????????
???????????? log( 'encode start...synchronous convert to a WAV first' );
?????????????
???????????? convertToMP3();
???????? }
?????????
???????? private function convertToMP3(): void
???????? {
???????????? var wavWrite:WAVWriter = new WAVWriter();
???????????? wavWrite.numOfChannels = 1 ;
???????????? wavWrite.sampleBitRate = 16 ;
???????????? wavWrite.samplingRate = 44100 ;
?????????????
???????????? var wav:ByteArray = new ByteArray();
?????????????
???????????? _timer = getTimer();
???????????? wavWrite.processSamples(wav,_voice, 44100 , 1 );
???????????? log( 'convert to a WAV used: ' + (getTimer() - _timer) + 'ms' );
?????????????
???????????? wav.position = 0 ;
???????????? log( 'WAV size:' + wav.bytesAvailable + ' bytes' );
???????????? log( 'Asynchronous convert to MP3 now' );
?????????????
???????????? _timer = getTimer();
???????????? _mp3Encoder = new ShineMP3Encoder( wav );
???????????? _mp3Encoder.addEventListener(Event.COMPLETE,onEncoded);
???????????? _mp3Encoder.addEventListener(ProgressEvent.PROGRESS,onEncoding);
???????????? _mp3Encoder.addEventListener(ErrorEvent.ERROR,onEncodeError);
???????????? _mp3Encoder.start();
???????? }
?????????
???????? private function onEncoded(e:Event): void
???????? {
???????????? _state = 'encoded' ;
???????????? log( 'encode MP3 complete used: ' + (getTimer() - _timer) + 'ms' );
???????????? _mp3Encoder.mp3Data.position = 0 ;
???????????? log( 'MP3 size:' + _mp3Encoder.mp3Data.bytesAvailable + ' bytes' );
???????????? log( 'press <key>: <s>ave to MP3 or <r>ecord again' );
???????? }
?????????
???????? private function onEncoding(e:ProgressEvent): void
???????? {
???????????? log( 'encoding MP3... ' + Number (e.bytesLoaded / e.bytesTotal * 100 ).toFixed( 2 ) + '%' , true );
???????? }
?????????
???????? private function onEncodeError(e:ErrorEvent): void
???????? {
???????????? log( 'encode MP3 error ' + e.text);
???????? }
?????????
???????? private function onRecord(e:SampleDataEvent): void
???????? {
???????????? _voice.writeBytes( e.data );
?????????????
???????????? var str: String = '' ;
???????????? for ( var i: int = _mic.activityLevel; i--;)
???????????? {
???????????????? str += '*' ;
???????????? }
???????????? log( 'recoding ' + str, true );
???????? }
?????????
???????? private function log(msg: String ,updateInPlace: Boolean = false ): void
???????? {
???????????? var txt:TextField = getChildByName( 'logTxt' ) as TextField;
???????????? if (txt)
???????????? {
???????????????? if (updateInPlace)
???????????????? {
???????????????????? if (txt.text.substr( - 1 , 1 ) == 'r' )
???????????????????? {
???????????????????????? txt.text = txt.text.substr( 0 ,txt.text.lastIndexOf( 'r' ,txt.text.length - 2 ) );
???????????????????? }
???????????????????? txt.appendText( 'n' + msg + 'n' );
???????????????? }
???????????????? else
???????????????? {
???????????????????? txt.appendText((txt.text.substr(- 1 , 1 ) == 'r' ? '' : 'n' ) + msg);
???????????????? }
???????????????? txt.scrollV = txt.maxScrollV;
???????????? }
???????????? else
???????????? {
???????????????? txt = new TextField();
???????????????? txt.name = 'logTxt' ;
???????????????? txt.multiline = true ;
???????????????? txt.border = true ;
???????????????? txt.borderColor = 0x666666 ;
???????????????? txt.width = stage.stageWidth - 20 ;
???????????????? txt.height = stage.stageHeight - 20 ;
???????????????? txt.x = txt.y = 10 ;
???????????????? txt.text = msg;
???????????????? addChild(txt);
???????????? }
???????? }
???? }
?????
}
用下来，性能上没问题，转WAV虽然是同步的，但不实现压缩，效率上可以接受。录2分钟、12M大小的WAV，比转个800x600的JPG要快多了。转MP3是异步的，效率上没问题，只是目前没法更好的进行压缩设置。
如此，本地线上录音并保存MP3的功能，Flash已经可以做到了~~~
有些朋友问我要源码，虽然都贴出来了，不过想象几个外部类包的调用和配置还是比较无聊的。 [点此下载]

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