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_DecodeChromaDcCoeffsToPairCAVLC.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_DecodeChromaDcCoeffsToPairCAVLC 41 * 42 * Description: 43 * Performs CAVLC decoding and inverse raster scan for 2x2 block of 44 * ChromaDCLevel. The decoded coefficients in packed position-coefficient 45 * buffer are stored in increasing raster scan order, namely position order. 46 * 47 * Remarks: 48 * 49 * Parameters: 50 * [in] ppBitStream Double pointer to current byte in bit stream 51 * buffer 52 * [in] pOffset Pointer to current bit position in the byte 53 * pointed to by *ppBitStream 54 * [out] ppBitStream *ppBitStream is updated after each block is decoded 55 * [out] pOffset *pOffset is updated after each block is decoded 56 * [out] pNumCoeff Pointer to the number of nonzero coefficients 57 * in this block 58 * [out] ppPosCoefbuf Double pointer to destination residual 59 * coefficient-position pair buffer 60 * 61 * Return Value: 62 * Standard omxError result. See enumeration for possible result codes. 63 * 64 */ 65 66 OMXResult omxVCM4P10_DecodeChromaDcCoeffsToPairCAVLC ( 67 const OMX_U8** ppBitStream, 68 OMX_S32* pOffset, 69 OMX_U8* pNumCoeff, 70 OMX_U8** ppPosCoefbuf 71 ) 72 73 { 74 return armVCM4P10_DecodeCoeffsToPair(ppBitStream, pOffset, pNumCoeff, 75 ppPosCoefbuf, 17, 4); 76 77 } 78