omxVCM4P10_DecodeCoeffsToPairCAVLC.c revision 0c1bc742181ded4930842b46e9507372f0b1b963 
1/* ----------------------------------------------------------------
2 *
3 *
4 * File Name:  omxVCM4P10_DecodeCoeffsToPairCAVLC.c
5 * OpenMAX DL: v1.0.2
6 * Revision:   12290
7 * Date:       Wednesday, April 9, 2008
8 *
9 * (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
10 *
11 *
12 *
13 * H.264 decode coefficients module
14 *
15 */
16
17#include "omxtypes.h"
18#include "armOMX.h"
19#include "omxVC.h"
20
21#include "armCOMM.h"
22#include "armVC.h"
23
24/**
25 * Function: omxVCM4P10_DecodeCoeffsToPairCAVLC
26 *
27 * Description:
28 * Performs CAVLC decoding and inverse zigzag scan for 4x4 block of
29 * Intra16x16DCLevel, Intra16x16ACLevel,LumaLevel, and ChromaACLevel.
30 * Inverse field scan is not supported. The decoded coefficients in packed
31 * position-coefficient buffer are stored in increasing zigzag order instead
32 * of position order.
33 *
34 * Remarks:
35 *
36 * Parameters:
37 * [in]	ppBitStream		Double pointer to current byte in bit stream buffer
38 * [in]	pOffset			Pointer to current bit position in the byte pointed
39 *								to by *ppBitStream
40 * [in]	sMaxNumCoeff	Maximum number of non-zero coefficients in current
41 *								block
42 * [in]	sVLCSelect		VLC table selector, obtained from number of non-zero
43 *								AC coefficients of above and left 4x4 blocks. It is
44 *								equivalent to the variable nC described in H.264 standard
45 *								table 9-5, except its value can��t be less than zero.
46 * [out]	ppBitStream		*ppBitStream is updated after each block is decoded
47 * [out]	pOffset			*pOffset is updated after each block is decoded
48 * [out]	pNumCoeff		Pointer to the number of nonzero coefficients in
49 *								this block
50 * [out]	ppPosCoefbuf	Double pointer to destination residual
51 *								coefficient-position pair buffer
52 * Return Value:
53 * Standard omxError result. See enumeration for possible result codes.
54 *
55 */
56
57OMXResult omxVCM4P10_DecodeCoeffsToPairCAVLC(
58     const OMX_U8** ppBitStream,
59     OMX_S32* pOffset,
60     OMX_U8* pNumCoeff,
61     OMX_U8**ppPosCoefbuf,
62     OMX_INT sVLCSelect,
63     OMX_INT sMaxNumCoeff
64 )
65{
66    return armVCM4P10_DecodeCoeffsToPair(ppBitStream, pOffset, pNumCoeff,
67                                         ppPosCoefbuf, sVLCSelect, sMaxNumCoeff);
68}
69