Question

我正在编写简单的AS3应用程序，它将从麦克风录制音频，然后使用ByteArray数据播放它。

我做了应用程序，它正在录制，但是当我尝试播放它时播放速度提高了2倍......

有趣的是，它之前没问题，现在它更快......而且即使我运行旧文件，其代码在100％工作之前也会更快...

这是代码：

import flash.media.*;
import flash.events.*;
import flash.utils.ByteArray;

var ch:SoundChannel;
var soundBytes:ByteArray = new ByteArray();
var soundO:ByteArray = new ByteArray();
var sound:Sound= new Sound();


var mic:Microphone = Microphone.getMicrophone();
var recMode:Boolean = false;
var playMode:Boolean = false;

function init()
{
    mic.codec = "Speex";
    mic.setSilenceLevel(0);
    mic.gain = 50;
    mic.rate = 44;
}

function startRecord():void
{
    mic.addEventListener(SampleDataEvent.SAMPLE_DATA, micSampleDataHandler);
}
function stopRecord():void
{
    mic.removeEventListener(SampleDataEvent.SAMPLE_DATA, micSampleDataHandler);
    soundBytes.position = 0;
    soundO.length = 0;
    soundO.writeBytes(soundBytes);
    soundO.position = 0;
    soundBytes.length = 0;
}

function micSampleDataHandler(event:SampleDataEvent):void
{
    while (event.data.bytesAvailable)
    {
        var sample:Number = event.data.readFloat();
        soundBytes.writeFloat(sample);
    }
}

function playSound():void
{
    soundO.position = 0;
    sound.addEventListener(SampleDataEvent.SAMPLE_DATA, playbackSampleHandler);
    ch = sound.play();
    ch.addEventListener(Event.SOUND_COMPLETE,onSC);
}
function stopSound():void
{
    sound.removeEventListener(SampleDataEvent.SAMPLE_DATA, playbackSampleHandler);
    ch.stop();
    ch.removeEventListener(Event.SOUND_COMPLETE,onSC);
}
function onSC(evt:Event):void
{
    stopSound();
    soundO.position = 0;
    playMode = ! true;
    rec_btn.visible = true;
    rec_btn2.visible = false;
    play_btn.visible = true;
    play_btn2.visible = false;
}
function playbackSampleHandler(event:SampleDataEvent):void
{
    for (var i:int = 0; i < 8192; i++)
    {
        if (soundO.bytesAvailable < 4)
        {
            break;
        }
        var sample:Number = soundO.readFloat();
        event.data.writeFloat(sample);
        event.data.writeFloat(sample);


    }
}

rec_btn.buttonMode = rec_btn2.buttonMode = play_btn.buttonMode = play_btn2.buttonMode = true;
function showPlayUI()
{
    play_btn.visible = true;
}
function hidePlayUI()
{
    play_btn2.visible = false;
    rec_btn2.visible = false;
}
rec_btn.addEventListener(MouseEvent.CLICK,onRecord);
rec_btn2.addEventListener(MouseEvent.CLICK,onRecord);
play_btn.addEventListener(MouseEvent.CLICK,onPlay);
play_btn2.addEventListener(MouseEvent.CLICK,onPlay);


function onRecord(evt:MouseEvent=null):void
{
    if (playMode)
    {
        playMode = ! true;
        play_btn2.visible = false;
        play_btn.visible = true;
        stopSound();
    }


    if (! recMode)
    {
        recMode = true;
        rec_btn.visible = false;
        rec_btn2.visible = true;
        play_btn2.visible = false;
        startRecord();
    }
    else
    {
        recMode = ! true;
        rec_btn.visible = true;
        rec_btn2.visible = false;
        play_btn2.visible = false;
        stopRecord();
        showPlayUI();
    }
}
function onPlay(evt:MouseEvent=null):void
{
    if (recMode)
    {
        recMode = false;
        rec_btn.visible = true;
        rec_btn2.visible = false;
        stopRecord();
    }

    if (! playMode)
    {
        playMode = true;
        rec_btn2.visible = false;
        play_btn2.visible = true;
        play_btn.visible = false;
        playSound();
    }
    else
    {
        playMode = ! true;
        rec_btn2.visible = false;
        play_btn2.visible = false;
        play_btn.visible = true;
        stopSound();
    }
}


hidePlayUI();
init();

正如您所见，编码率为44，即接受率...

我在Vista上测试了这个，在我的电脑上使用XP测试，并且两者都更快......

以下是网址： Record and Play

Answer 1

我认为你不应该在你的playbackSampleHandler中调用两次。

    event.data.writeFloat(sample);
    event.data.writeFloat(sample);

Answer 2

Speex编解码器存在问题，因为它对麦克风的编码方式不同，所以当你尝试将它的级别用作Float时，它会将其写成编码声音，而不是原始...

双线是可以的，它应该是这样......

ByteArray使用Speex编解码器无效，请使用默认编解码器。

Flash录制和播放速度提高2倍

2 个答案: