#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. |
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
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 For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application. |
Win32, x64.
This example extracts a frame from JPX file.
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;
}
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