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: 12290 23 * Date: Wednesday, April 9, 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 cant 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 72 OMXResult 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
