L_INT LJp2FileFormat::ExtractFramesBufferMemory(pBuffer, uBufferSize, lpBuffer, puBufferSize, puFrames, uNumOfFrames)
Extracts the frames that are specified by puFrames from the JPEG 2000 file in memory and save them into a new JPEG 2000 file in a memory buffer that is allocated by the function contains only the extracted frames headers and codestreams directly not through decompressing/compressing process.
Pointer to the JPEG 2000 file in memory to extract frames from it.
Size of the in memory (in bytes).
Pointer to a pointer to be updated with an array of bytes that contains a JPEG 2000 file with extracted frames only. You must free this buffer by calling the Windows LocalFree() function.
Address of a variable to be updated with the size of the memory buffer in bytes.
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.
Number of frames to be extracted. This field specifies the size of puFrames array.
Value | Meaning |
---|---|
SUCCESS | The function was successful. |
< 1 | An error occurred. Refer to Return Codes. |
LJp2FileFormat::ExtractFramesBufferMemory extracts the specified frames from the JPEG 2000 file in memory and save them into a new JPEG 2000 file in a memory buffer that is allocated by the function 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 in a memory buffer.
Win32, x64.
This example extracts a frame from JPX file.
L_INT LJp2FileFormat__ExtractFramesBufferMemoryExample(L_UINT8* pFileBuffer, L_SIZE_T uFileSize, L_UINT8** lpFrameBuffer, L_SIZE_T * puFrameSize)
{
L_INT nRet = 0;
LJp2FileFormat Engine;
L_JP2_FILEINFO Jp2FileInfo;
L_UINT32 puFrames[1];
*lpFrameBuffer = NULL;
*puFrameSize = 0;
Jp2FileInfo.uStructSize = sizeof(L_JP2_FILEINFO);
nRet = Engine.GetFileInfoMemory( pFileBuffer, uFileSize, &Jp2FileInfo);
if(nRet != SUCCESS)
return nRet;
/*Extract the second frame*/
puFrames[0] = 0;
nRet = Engine.ExtractFramesBufferMemory( pFileBuffer, uFileSize, lpFrameBuffer, puFrameSize, 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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