LJp2FileFormat::ExtractFrames

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#include "ltwrappr.h"

L_INT LJp2FileFormat::ExtractFrames(pInFileName, pOutFileName, puFrames, uNumOfFrames)

L_TCHAR * pInFileName;	/* name of the input file */
L_TCHAR * pOutFileName;	/* name of the output file */
L_UINT32 * puFrames;	/* frame indices*/
L_UINT32 uNumOfFrames;	/* number of frames to be extracted */

Extracts the frames that are specified by puFrames from the input file, and saves them into a new JPEG 2000 file contains only the extracted frames headers and codestreams directly not through decompressing/compressing process.

Parameter	Description
pInFileName	Character string that contains the name of the JPEG 2000 file to extract frames from it.
pOutFileName	Character string that contains the name of the new JPEG 2000 file that contains the extracted frames only.
puFrames	Array of unsigned integers specifies the indices of the frames to be extracted from the input JPEG 2000 file. All indices shall be 0-based. If any frames index is out the frames number the function will return ERROR_INV_PARAMETER.
uNumOfFrames	Number of frames to be extracted. This field specifies the size of puFrames array.

Returns

SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

LJp2FileFormat::ExtractFrames extracts the specified frames from the input file and save them into a new JPEG 2000 file contains only the extracted frames headers and codestreams directly not through decompressing/compressing process so it saves processor time and memory. This function is very suitable to server application where multiple clients request specific frames of a JPEG 2000 file so instead of decompressing then compressing the frames this function copies only the needed frames data to generate them and saves the data into a new JPEG 2000 file.

Required DLLs and Libraries

LTJP2
LFJ2K
LTIMGEFX

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64.

See Also

Functions:	LJp2FileFormat::ExtractFramesBuffer, LJp2FileFormat::ExtractFramesBufferMemory, LJp2FileFormat::AppendFrames, LJp2FileFormat::AppendGMLData, LJp2FileFormat::ReadBox, LJp2FileFormat::ReadGMLData, LJp2FileFormat::ReadFrames, LJp2FileFormat::FragmentJpxFile
Topics:	Implementing JPEG 2000 Features
	Raster Image Functions: Working with JPEG 2000
	Programming with JPX Features
	JPX File Comments
	Raster Image Functions: Working with JPX

Example

This example extracts a frame from JPX file.

#define MAKE_IMAGE_PATH(pFileName) TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\")pFileName
L_INT LJp2FileFormat__ExtractFramesExample(L_VOID)
{
   LJp2FileFormat Engine;
   L_JP2_FILEINFO Jp2FileInfo;
   L_UINT32 puFrames[1];
   L_INT nRet = 0;
   Jp2FileInfo.uStructSize = sizeof(L_JP2_FILEINFO);
   Engine.GetFileInfo(MAKE_IMAGE_PATH(TEXT("image1.jpx")),&Jp2FileInfo);
   if(Jp2FileInfo.MPEG7.uNumOfBoxes == 0)
      return 0;
   if(Jp2FileInfo.uNumOfFrames < 2)
      return 0;
   if(Jp2FileInfo.DataRef.uNumOfBoxes)
      return 0;
   /*Extract the second frame*/
   puFrames[0] = 1;
   nRet = Engine.ExtractFrames(MAKE_IMAGE_PATH(TEXT("image1.jpx")), MAKE_IMAGE_PATH(TEXT("Test.jpx")), puFrames, 1);
   if(nRet != SUCCESS)
      return nRet;
   /*Free File Info structure*/
   nRet = Engine.FreeFileInfo( &Jp2FileInfo);
   if(nRet != SUCCESS)
      return nRet;
   return SUCCESS;
}