Fixed whitespace and formatting in util.SimpleFlvWriter

This commit is contained in:
Nathan Dinsmore 2014-06-24 12:52:47 -04:00
parent 3ca6d42232
commit 9ae4614595

View file

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