mirror of
https://github.com/scratchfoundation/scratch-flash.git
synced 2024-12-04 13:11:12 -05:00
Fixed whitespace and formatting in util.SimpleFlvWriter
This commit is contained in:
Nathan Dinsmore
parent
3ca6d42232
commit
9ae4614595
1 changed files with 267 additions and 282 deletions
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@ -23,295 +23,280 @@
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http://www.zeropointnine.com/blog
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5-2007
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v0.8
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Singleton class to create uncompressed FLV files.
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Does not handle audio. Feel free to extend.
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Source code licensed under a Creative Commons Attribution 3.0 License.
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http://creativecommons.org/licenses/by/3.0/
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Some Rights Reserved.
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EXAMPLE USAGE:
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var myWriter:SimpleFlvWriter = SimpleFlvWriter.getInstance();
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myWriter.createFile(myFile, 320,240, 30, 120);
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myWriter.saveFrame( myBitmapData1 );
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myWriter.saveFrame( myBitmapData2 );
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myWriter.saveFrame( myBitmapData3 ); // etc.
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myWriter.saveFrame(myBitmapData1);
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myWriter.saveFrame(myBitmapData2);
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myWriter.saveFrame(myBitmapData3); // etc.
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*/
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package util {
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import flash.display.BitmapData;
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import flash.net.*;
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import flash.utils.ByteArray;
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import flash.display.BitmapData;
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import flash.net.*;
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import flash.utils.ByteArray;
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public class SimpleFlvWriter {
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static private var _instance:SimpleFlvWriter;
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private var frameWidth:int;
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private var frameHeight:int;
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private var frameRate:Number;
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private var duration:Number;
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static private var _instance:SimpleFlvWriter;
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private var fs:ByteArray = new ByteArray();
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private const blockWidth:int = 32;
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private const blockHeight:int = 32;
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private var previousTagSize:uint = 0;
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private var iteration:int = 0;
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private var bmp:BitmapData;
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private var frameWidth:int;
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private var frameHeight:int;
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private var frameRate:Number;
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private var duration:Number;
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public static function getInstance():SimpleFlvWriter
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{
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if(SimpleFlvWriter._instance == null)
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SimpleFlvWriter._instance = new SimpleFlvWriter(new SingletonEnforcer());
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return SimpleFlvWriter._instance;
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private var fs:ByteArray = new ByteArray();
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private const blockWidth:int = 32;
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private const blockHeight:int = 32;
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private var previousTagSize:uint = 0;
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private var iteration:int = 0;
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private var bmp:BitmapData;
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public static function getInstance():SimpleFlvWriter {
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if(SimpleFlvWriter._instance == null) {
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SimpleFlvWriter._instance = new SimpleFlvWriter(new SingletonEnforcer());
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}
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public function SimpleFlvWriter(singletonEnforcer:SingletonEnforcer)
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{
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}
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public function createFile(bytes:ByteArray, pWidth:int, pHeight:int, pFramesPerSecond:Number, pDurationInSeconds:Number=0):void
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{
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/*
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Parameters:
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pFile: The file which will be created and written to
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pWidth: Video height
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pWidth: Video width
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pFramesPerSecond: Determines framerate of created video
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pDurationInSeconds: Duration of video file to be created. Used for metadata only. Optional.
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*/
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frameWidth = pWidth;
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frameHeight = pHeight;
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frameRate = pFramesPerSecond;
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duration = pDurationInSeconds;
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fs = bytes;
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// create header
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fs.writeBytes( header() );
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// create metadata tag
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fs.writeUnsignedInt( previousTagSize );
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fs.writeBytes( flvTagOnMetaData() );
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}
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public function saveFrame(pBitmapData:BitmapData):void
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{
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// bitmap dimensions should of course match parameters passed to createFile()
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bmp = pBitmapData;
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fs.writeUnsignedInt( previousTagSize );
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fs.writeBytes( flvTagVideo() );
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}
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private function header():ByteArray
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{
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var ba:ByteArray = new ByteArray();
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ba.writeByte(0x46) // 'F'
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ba.writeByte(0x4C) // 'L'
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ba.writeByte(0x56) // 'V'
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ba.writeByte(0x01) // Version 1
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ba.writeByte(0x01) // misc flags - video stream only
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ba.writeUnsignedInt(0x09) // header length
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return ba;
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}
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private function flvTagVideo():ByteArray
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{
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var tag:ByteArray = new ByteArray();
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var dat:ByteArray = videoData();
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var timeStamp:uint = uint(1000/frameRate * iteration++);
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// tag 'header'
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tag.writeByte( 0x09 ); // tagType = video
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writeUI24(tag, dat.length); // data size
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writeUI24(tag, timeStamp); // timestamp in ms
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tag.writeByte(0); // timestamp extended, not using ***
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writeUI24(tag, 0); // streamID always 0
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// videodata
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tag.writeBytes( dat );
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previousTagSize = tag.length;
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return tag;
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}
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private function videoData():ByteArray
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{
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var v:ByteArray = new ByteArray;
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// VIDEODATA 'header'
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v.writeByte(0x13); // frametype (1) + codecid (3)
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// SCREENVIDEOPACKET 'header'
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// blockwidth/16-1 (4bits) + imagewidth (12bits)
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writeUI4_12(v, int(blockWidth/16) - 1, frameWidth);
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// blockheight/16-1 (4bits) + imageheight (12bits)
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writeUI4_12(v, int(blockHeight/16) - 1, frameHeight);
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// VIDEODATA > SCREENVIDEOPACKET > IMAGEBLOCKS:
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var yMax:int = int(frameHeight/blockHeight);
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var yRemainder:int = frameHeight % blockHeight;
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if (yRemainder > 0) yMax += 1;
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var xMax:int = int(frameWidth/blockWidth);
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var xRemainder:int = frameWidth % blockWidth;
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if (xRemainder > 0) xMax += 1;
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for (var y1:int = 0; y1 < yMax; y1++)
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{
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for (var x1:int = 0; x1 < xMax; x1++)
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{
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// create block
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var block:ByteArray = new ByteArray();
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var yLimit:int = blockHeight;
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if (yRemainder > 0 && y1 + 1 == yMax) yLimit = yRemainder;
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for (var y2:int = 0; y2 < yLimit; y2++)
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{
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var xLimit:int = blockWidth;
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if (xRemainder > 0 && x1 + 1 == xMax) xLimit = xRemainder;
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for (var x2:int = 0; x2 < xLimit; x2++)
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{
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var px:int = (x1 * blockWidth) + x2;
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var py:int = frameHeight - ((y1 * blockHeight) + y2); // (flv's save from bottom to top)
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var p:uint = bmp.getPixel(px, py);
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block.writeByte( p & 0xff ); // blue
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block.writeByte( p >> 8 & 0xff ); // green
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block.writeByte( p >> 16 ); // red
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}
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}
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block.compress();
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writeUI16(v, block.length); // write block length (UI16)
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v.writeBytes( block ); // write block
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}
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}
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return v;
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}
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private function flvTagOnMetaData():ByteArray
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{
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var tag:ByteArray = new ByteArray();
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var dat:ByteArray = metaData();
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// tag 'header'
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tag.writeByte( 18 ); // tagType = script data
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writeUI24(tag, dat.length); // data size
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writeUI24(tag, 0); // timestamp should be 0 for onMetaData tag
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tag.writeByte(0); // timestamp extended
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writeUI24(tag, 0); // streamID always 0
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// data tag
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tag.writeBytes( dat );
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previousTagSize = tag.length;
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return tag;
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}
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private function metaData():ByteArray
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{
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// onMetaData info goes in a ScriptDataObject of data type 'ECMA Array'
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var b:ByteArray = new ByteArray();
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// ObjectNameType (always 2)
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b.writeByte(2);
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// ObjectName (type SCRIPTDATASTRING):
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writeUI16(b, "onMetaData".length); // StringLength
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b.writeUTFBytes( "onMetaData" ); // StringData
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// ObjectData (type SCRIPTDATAVALUE):
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b.writeByte(8); // Type (ECMA array = 8)
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b.writeUnsignedInt(7) // // Elements in array
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// SCRIPTDATAVARIABLES...
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if (duration > 0) {
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writeUI16(b, "duration".length);
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b.writeUTFBytes("duration");
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b.writeByte(0);
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b.writeDouble(duration);
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}
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writeUI16(b, "width".length);
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b.writeUTFBytes("width");
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b.writeByte(0);
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b.writeDouble(frameWidth);
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writeUI16(b, "height".length);
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b.writeUTFBytes("height");
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b.writeByte(0);
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b.writeDouble(frameHeight);
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writeUI16(b, "framerate".length);
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b.writeUTFBytes("framerate");
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b.writeByte(0);
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b.writeDouble(frameRate);
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writeUI16(b, "videocodecid".length);
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b.writeUTFBytes("videocodecid");
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b.writeByte(0);
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b.writeDouble(3); // 'Screen Video' = 3
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writeUI16(b, "canSeekToEnd".length);
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b.writeUTFBytes("canSeekToEnd");
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b.writeByte(1);
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b.writeByte(int(true));
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var mdc:String = "SimpleFLVWriter.as v0.8 zeropointnine.com";
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writeUI16(b, "metadatacreator".length);
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b.writeUTFBytes("metadatacreator");
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b.writeByte(2);
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writeUI16(b, mdc.length);
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b.writeUTFBytes(mdc);
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// VariableEndMarker1 (type UI24 - always 9)
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writeUI24(b, 9);
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return b;
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}
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private function writeUI24(stream:*, p:uint):void
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{
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var byte1:int = p >> 16;
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var byte2:int = p >> 8 & 0xff;
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var byte3:int = p & 0xff;
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stream.writeByte(byte1);
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stream.writeByte(byte2);
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stream.writeByte(byte3);
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}
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private function writeUI16(stream:*, p:uint):void
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{
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stream.writeByte( p >> 8 )
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stream.writeByte( p & 0xff );
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}
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private function writeUI4_12(stream:*, p1:uint, p2:uint):void
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{
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// writes a 4-bit value followed by a 12-bit value in two sequential bytes
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var byte1a:int = p1 << 4;
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var byte1b:int = p2 >> 8;
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var byte1:int = byte1a + byte1b;
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var byte2:int = p2 & 0xff;
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stream.writeByte(byte1);
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stream.writeByte(byte2);
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}
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return SimpleFlvWriter._instance;
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}
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}
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public function SimpleFlvWriter(singletonEnforcer:SingletonEnforcer) {}
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public function createFile(bytes:ByteArray, pWidth:int, pHeight:int, pFramesPerSecond:Number, pDurationInSeconds:Number=0):void {
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/*
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Parameters:
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pFile: The file which will be created and written to
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pWidth: Video height
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pWidth: Video width
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pFramesPerSecond: Determines framerate of created video
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pDurationInSeconds: Duration of video file to be created. Used for metadata only. Optional.
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*/
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frameWidth = pWidth;
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frameHeight = pHeight;
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frameRate = pFramesPerSecond;
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duration = pDurationInSeconds;
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fs = bytes;
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// create header
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fs.writeBytes(header());
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// create metadata tag
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fs.writeUnsignedInt(previousTagSize);
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fs.writeBytes(flvTagOnMetaData());
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}
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public function saveFrame(pBitmapData:BitmapData):void {
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// bitmap dimensions should of course match parameters passed to createFile()
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bmp = pBitmapData;
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fs.writeUnsignedInt(previousTagSize);
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fs.writeBytes(flvTagVideo());
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}
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private function header():ByteArray {
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var ba:ByteArray = new ByteArray();
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ba.writeByte(0x46) // 'F'
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ba.writeByte(0x4C) // 'L'
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ba.writeByte(0x56) // 'V'
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ba.writeByte(0x01) // Version 1
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ba.writeByte(0x01) // misc flags - video stream only
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ba.writeUnsignedInt(0x09) // header length
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return ba;
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}
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private function flvTagVideo():ByteArray {
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var tag:ByteArray = new ByteArray();
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var dat:ByteArray = videoData();
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var timeStamp:uint = uint(1000/frameRate * iteration++);
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// tag 'header'
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tag.writeByte(0x09); // tagType = video
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writeUI24(tag, dat.length); // data size
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writeUI24(tag, timeStamp); // timestamp in ms
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tag.writeByte(0); // timestamp extended, not using ***
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writeUI24(tag, 0); // streamID always 0
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// videodata
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tag.writeBytes(dat);
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previousTagSize = tag.length;
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return tag;
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}
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private function videoData():ByteArray {
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var v:ByteArray = new ByteArray;
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// VIDEODATA 'header'
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v.writeByte(0x13); // frametype (1) + codecid (3)
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// SCREENVIDEOPACKET 'header'
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// blockwidth/16-1 (4bits) + imagewidth (12bits)
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writeUI4_12(v, int(blockWidth/16) - 1, frameWidth);
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// blockheight/16-1 (4bits) + imageheight (12bits)
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writeUI4_12(v, int(blockHeight/16) - 1, frameHeight);
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// VIDEODATA > SCREENVIDEOPACKET > IMAGEBLOCKS:
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var yMax:int = int(frameHeight/blockHeight);
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var yRemainder:int = frameHeight % blockHeight;
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if (yRemainder > 0) yMax += 1;
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var xMax:int = int(frameWidth/blockWidth);
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var xRemainder:int = frameWidth % blockWidth;
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if (xRemainder > 0) xMax += 1;
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for (var y1:int = 0; y1 < yMax; y1++) {
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for (var x1:int = 0; x1 < xMax; x1++) {
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// create block
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var block:ByteArray = new ByteArray();
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var yLimit:int = blockHeight;
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if (yRemainder > 0 && y1 + 1 == yMax) yLimit = yRemainder;
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for (var y2:int = 0; y2 < yLimit; y2++) {
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var xLimit:int = blockWidth;
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if (xRemainder > 0 && x1 + 1 == xMax) xLimit = xRemainder;
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for (var x2:int = 0; x2 < xLimit; x2++) {
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var px:int = (x1 * blockWidth) + x2;
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var py:int = frameHeight - ((y1 * blockHeight) + y2); // (flv's save from bottom to top)
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var p:uint = bmp.getPixel(px, py);
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block.writeByte(p & 0xff); // blue
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block.writeByte(p >> 8 & 0xff); // green
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block.writeByte(p >> 16); // red
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}
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}
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block.compress();
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writeUI16(v, block.length); // write block length (UI16)
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v.writeBytes(block); // write block
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}
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}
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return v;
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}
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private function flvTagOnMetaData():ByteArray {
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var tag:ByteArray = new ByteArray();
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var dat:ByteArray = metaData();
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|
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// tag 'header'
|
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tag.writeByte(18); // tagType = script data
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writeUI24(tag, dat.length); // data size
|
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writeUI24(tag, 0); // timestamp should be 0 for onMetaData tag
|
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tag.writeByte(0); // timestamp extended
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writeUI24(tag, 0); // streamID always 0
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// data tag
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tag.writeBytes(dat);
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previousTagSize = tag.length;
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return tag;
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}
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private function metaData():ByteArray
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{
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// onMetaData info goes in a ScriptDataObject of data type 'ECMA Array'
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var b:ByteArray = new ByteArray();
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// ObjectNameType (always 2)
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b.writeByte(2);
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// ObjectName (type SCRIPTDATASTRING):
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writeUI16(b, "onMetaData".length); // StringLength
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b.writeUTFBytes("onMetaData"); // StringData
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// ObjectData (type SCRIPTDATAVALUE):
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b.writeByte(8); // Type (ECMA array = 8)
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b.writeUnsignedInt(7) // // Elements in array
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// SCRIPTDATAVARIABLES...
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if (duration > 0) {
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writeUI16(b, "duration".length);
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b.writeUTFBytes("duration");
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b.writeByte(0);
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b.writeDouble(duration);
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}
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writeUI16(b, "width".length);
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b.writeUTFBytes("width");
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b.writeByte(0);
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b.writeDouble(frameWidth);
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writeUI16(b, "height".length);
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b.writeUTFBytes("height");
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b.writeByte(0);
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b.writeDouble(frameHeight);
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writeUI16(b, "framerate".length);
|
||||
b.writeUTFBytes("framerate");
|
||||
b.writeByte(0);
|
||||
b.writeDouble(frameRate);
|
||||
|
||||
writeUI16(b, "videocodecid".length);
|
||||
b.writeUTFBytes("videocodecid");
|
||||
b.writeByte(0);
|
||||
b.writeDouble(3); // 'Screen Video' = 3
|
||||
|
||||
writeUI16(b, "canSeekToEnd".length);
|
||||
b.writeUTFBytes("canSeekToEnd");
|
||||
b.writeByte(1);
|
||||
b.writeByte(int(true));
|
||||
|
||||
var mdc:String = "SimpleFLVWriter.as v0.8 zeropointnine.com";
|
||||
writeUI16(b, "metadatacreator".length);
|
||||
b.writeUTFBytes("metadatacreator");
|
||||
b.writeByte(2);
|
||||
writeUI16(b, mdc.length);
|
||||
b.writeUTFBytes(mdc);
|
||||
|
||||
// VariableEndMarker1 (type UI24 - always 9)
|
||||
writeUI24(b, 9);
|
||||
|
||||
return b;
|
||||
}
|
||||
|
||||
private function writeUI24(stream:*, p:uint):void {
|
||||
var byte1:int = p >> 16;
|
||||
var byte2:int = p >> 8 & 0xff;
|
||||
var byte3:int = p & 0xff;
|
||||
stream.writeByte(byte1);
|
||||
stream.writeByte(byte2);
|
||||
stream.writeByte(byte3);
|
||||
}
|
||||
|
||||
private function writeUI16(stream:*, p:uint):void {
|
||||
stream.writeByte(p >> 8);
|
||||
stream.writeByte(p & 0xff);
|
||||
}
|
||||
|
||||
private function writeUI4_12(stream:*, p1:uint, p2:uint):void {
|
||||
// writes a 4-bit value followed by a 12-bit value in two sequential bytes
|
||||
|
||||
var byte1a:int = p1 << 4;
|
||||
var byte1b:int = p2 >> 8;
|
||||
var byte1:int = byte1a + byte1b;
|
||||
var byte2:int = p2 & 0xff;
|
||||
|
||||
stream.writeByte(byte1);
|
||||
stream.writeByte(byte2);
|
||||
}
|
||||
|
||||
}}
|
||||
|
||||
class SingletonEnforcer {}
|
||||
|
||||
|
|
@ -332,20 +317,20 @@ class SingletonEnforcer {}
|
|||
previoustagsize
|
||||
flvtag
|
||||
...
|
||||
|
||||
|
||||
|
||||
FLV file format:
|
||||
|
||||
|
||||
header
|
||||
|
||||
|
||||
last tag size
|
||||
|
||||
|
||||
FLVTAG:
|
||||
tagtype
|
||||
datasize
|
||||
timestamp
|
||||
timestampextended
|
||||
streamid
|
||||
streamid
|
||||
data [VIDEODATA]:
|
||||
frametype
|
||||
codecid
|
||||
|
|
@ -354,13 +339,13 @@ class SingletonEnforcer {}
|
|||
imagewidth ub[12]
|
||||
blockheight ub[4]
|
||||
imageheight ub[12]
|
||||
imageblocks [IMAGEBLOCKS[]]:
|
||||
imageblocks [IMAGEBLOCKS[]]:
|
||||
datasize ub[16] <same as 'ub16', i think>
|
||||
data..
|
||||
|
||||
|
||||
last tag size
|
||||
|
||||
|
||||
FLVTAG
|
||||
|
||||
etc.
|
||||
|
||||
etc.
|
||||
*/
|
||||
|
|
|
|||
Loading…
Reference in a new issue