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/**
*
* File Name: omxVCM4P2_EncodeVLCZigzag_Inter.c
* OpenMAX DL: v1.0.2
* Revision: 9641
* Date: Thursday, February 7, 2008
*
* (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
*
*
*
* Description:
* Contains modules for zigzag scanning and VLC encoding
* for inter block.
*
*/
#include "omxtypes.h"
#include "armOMX.h"
#include "omxVC.h"
#include "armVC.h"
#include "armCOMM_Bitstream.h"
#include "armCOMM.h"
#include "armVCM4P2_Huff_Tables_VLC.h"
#include "armVCM4P2_ZigZag_Tables.h"
/**
* Function: omxVCM4P2_EncodeVLCZigzag_Inter (6.2.4.5.3)
*
* Description:
* Performs classical zigzag scanning and VLC encoding for one inter block.
*
* Input Arguments:
*
* ppBitStream - pointer to the pointer to the current byte in the bit
* stream
* pBitOffset - pointer to the bit position in the byte pointed by
* *ppBitStream. Valid within 0 to 7
* pQDctBlkCoef - pointer to the quantized DCT coefficient
* pattern - block pattern which is used to decide whether this block is
* encoded
* shortVideoHeader - binary flag indicating presence of
* short_video_header; escape modes 0-3 are used if
* shortVideoHeader==0, and escape mode 4 is used when
* shortVideoHeader==1.
*
* Output Arguments:
*
* ppBitStream - *ppBitStream is updated after the block is encoded so that
* it points to the current byte in the bit stream buffer.
* pBitOffset - *pBitOffset is updated so that it points to the current bit
* position in the byte pointed by *ppBitStream.
*
* Return Value:
*
* OMX_Sts_NoErr - no error
* OMX_Sts_BadArgErr - Bad arguments
* - At least one of the pointers: is NULL: ppBitStream, *ppBitStream,
* pBitOffset, pQDctBlkCoef
* - *pBitOffset < 0, or *pBitOffset >7.
*
*/
OMXResult omxVCM4P2_EncodeVLCZigzag_Inter(
OMX_U8 **ppBitStream,
OMX_INT * pBitOffset,
const OMX_S16 *pQDctBlkCoef,
OMX_U8 pattern,
OMX_INT shortVideoHeader
)
{
OMX_U8 start = 0;
const OMX_U8 *pZigzagTable = armVCM4P2_aClassicalZigzagScan;
/* Argument error checks */
armRetArgErrIf(ppBitStream == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(*ppBitStream == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(pBitOffset == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(pQDctBlkCoef == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf((*pBitOffset < 0) || (*pBitOffset >7), OMX_Sts_BadArgErr);
if (pattern)
{
armVCM4P2_PutVLCBits (
ppBitStream,
pBitOffset,
pQDctBlkCoef,
shortVideoHeader,
start,
26,
40,
10,
1,
armVCM4P2_InterL0RunIdx,
armVCM4P2_InterVlcL0,
armVCM4P2_InterL1RunIdx,
armVCM4P2_InterVlcL1,
armVCM4P2_InterL0LMAX,
armVCM4P2_InterL1LMAX,
armVCM4P2_InterL0RMAX,
armVCM4P2_InterL1RMAX,
pZigzagTable
);
} /* Pattern check ends*/
return OMX_Sts_NoErr;
}
/* End of file */
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