omxVCM4P10_DecodeCoeffsToPairCAVLC.c revision 78e52bfac041d71ce53b5b13c2abf78af742b09d 
1/*
2 * Copyright (C) 2007-2008 ARM Limited
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *
16 */
17/* ----------------------------------------------------------------
18 *
19 *
20 * File Name:  omxVCM4P10_DecodeCoeffsToPairCAVLC.c
21 * OpenMAX DL: v1.0.2
22 * Revision:   9641
23 * Date:       Thursday, February 7, 2008
24 *
25 *
26 *
27 *
28 * H.264 decode coefficients module
29 *
30 */
31
32#include "omxtypes.h"
33#include "armOMX.h"
34#include "omxVC.h"
35
36#include "armCOMM.h"
37#include "armVC.h"
38
39/**
40 * Function: omxVCM4P10_DecodeCoeffsToPairCAVLC
41 *
42 * Description:
43 * Performs CAVLC decoding and inverse zigzag scan for 4x4 block of
44 * Intra16x16DCLevel, Intra16x16ACLevel,LumaLevel, and ChromaACLevel.
45 * Inverse field scan is not supported. The decoded coefficients in packed
46 * position-coefficient buffer are stored in increasing zigzag order instead
47 * of position order.
48 *
49 * Remarks:
50 *
51 * Parameters:
52 * [in]	ppBitStream		Double pointer to current byte in bit stream buffer
53 * [in]	pOffset			Pointer to current bit position in the byte pointed
54 *								to by *ppBitStream
55 * [in]	sMaxNumCoeff	Maximum number of non-zero coefficients in current
56 *								block
57 * [in]	sVLCSelect		VLC table selector, obtained from number of non-zero
58 *								AC coefficients of above and left 4x4 blocks. It is
59 *								equivalent to the variable nC described in H.264 standard
60 *								table 9-5, except its value can��t be less than zero.
61 * [out]	ppBitStream		*ppBitStream is updated after each block is decoded
62 * [out]	pOffset			*pOffset is updated after each block is decoded
63 * [out]	pNumCoeff		Pointer to the number of nonzero coefficients in
64 *								this block
65 * [out]	ppPosCoefbuf	Double pointer to destination residual
66 *								coefficient-position pair buffer
67 * Return Value:
68 * Standard omxError result. See enumeration for possible result codes.
69 *
70 */
71
72OMXResult omxVCM4P10_DecodeCoeffsToPairCAVLC(
73     const OMX_U8** ppBitStream,
74     OMX_S32* pOffset,
75     OMX_U8* pNumCoeff,
76     OMX_U8**ppPosCoefbuf,
77     OMX_INT sVLCSelect,
78     OMX_INT sMaxNumCoeff
79 )
80{
81    return armVCM4P10_DecodeCoeffsToPair(ppBitStream, pOffset, pNumCoeff,
82                                         ppPosCoefbuf, sVLCSelect, sMaxNumCoeff);
83}
84