所以基本上我有一个用Flash CS5制作的音板,是否可以使用Flash替换库的音频文件的声音?就像让剪辑听起来更深或更快一样,这就是重点。但如果它不是pissbile
答案 0 :(得分:0)
你不能在AS2中这样做。但是,您可以在AS3中更改声音的音高和播放速度。事实上,你可以做更多的事情(搜索Audiotool),但这表明它是如何完成的: http://plasticsturgeon.com/2012/05/changing-the-pitch-of-a-looped-sound-at-runtime-with-actionscript/
如果我的博客发生故障或其他事情,这里是改变声音音调的相关课程。:
package sound
{
import flash.events.Event;
import flash.events.SampleDataEvent;
import flash.media.Sound;
import flash.media.SoundChannel;
import flash.media.SoundTransform;
import flash.net.URLRequest;
import flash.utils.ByteArray;
/**
* @author Andre Michelle (andr...@gmail.com)
* Modified by Zach Foley aka The Plastic Sturgeon
*/
public class MP3Pitch
{
private const BLOCK_SIZE: int = 3072;
private var _mp3: Sound;
private var _sound: Sound;
private var _target: ByteArray;
private var _position: Number;
private var _rate: Number;
private var repeat:SoundChannel;
private var _volume:Number = 1;
private var byteArray:ByteArray;
// Pass in your looped Sound
public function MP3Pitch( pitchedSound: Sound)
{
_target = new ByteArray();
_mp3 = pitchedSound;
_position = 0.0;
_rate = 0.0;
_sound = new Sound();
_sound.addEventListener( SampleDataEvent.SAMPLE_DATA, sampleData );
repeat = _sound.play();
}
public function get rate(): Number
{
return _rate;
}
// Also added a handy volume setter
public function set volume( value: Number ): void
{
_volume = value;
repeat.soundTransform = new SoundTransform(_volume);
}
// use this to set the pitch of your sound
public function set rate( value: Number ): void
{
if( value < 0.0 )
value = 0;
_rate = value;
}
private function sampleData( event: SampleDataEvent ): void
{
//-- REUSE INSTEAD OF RECREATION
_target.position = 0;
//-- SHORTCUT
var data: ByteArray = event.data;
var scaledBlockSize: Number = BLOCK_SIZE * _rate;
var positionInt: int = _position;
var alpha: Number = _position - positionInt;
var positionTargetNum: Number = alpha;
var positionTargetInt: int = -1;
//-- COMPUTE NUMBER OF SAMPLES NEED TO PROCESS BLOCK (+2 FOR INTERPOLATION)
var need: int = Math.ceil( scaledBlockSize ) + 2;
//-- EXTRACT SAMPLES
var read: int = _mp3.extract( _target, need, positionInt );
var n: int = read == need ? BLOCK_SIZE : read / _rate;
var l0: Number;
var r0: Number;
var l1: Number;
var r1: Number;
for( var i: int = 0 ; i < n ; ++i )
{
//-- AVOID READING EQUAL SAMPLES, IF RATE < 1.0
if( int( positionTargetNum ) != positionTargetInt )
{
positionTargetInt = positionTargetNum;
//-- SET TARGET READ POSITION
_target.position = positionTargetInt << 3; //-- READ TWO STEREO SAMPLES FOR LINEAR INTERPOLATION l0 = _target.readFloat(); r0 = _target.readFloat(); l1 = _target.readFloat(); r1 = _target.readFloat(); } //-- WRITE INTERPOLATED AMPLITUDES INTO STREAM data.writeFloat( l0 + alpha * ( l1 - l0 ) ); data.writeFloat( r0 + alpha * ( r1 - r0 ) ); //-- INCREASE TARGET POSITION positionTargetNum += _rate; //-- INCREASE FRACTION AND CLAMP BETWEEN 0 AND 1 alpha += _rate; while( alpha >= 1.0 ) --alpha;
}
//-- FILL REST OF STREAM WITH ZEROs
if( i < BLOCK_SIZE )
{
while( i < BLOCK_SIZE ) { data.writeFloat( 0.0 ); data.writeFloat( 0.0 ); ++i; } } //-- INCREASE SOUND POSITION _position += scaledBlockSize; // My little addition here: if (_position > _mp3.length * 44.1) {
_position = 0;
_target.position = 0;
}
}
}
}