| /* |
| * Copyright (C) 2007-2008 ARM Limited |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| /** |
| * |
| * File Name: armVCM4P2_DecodeVLCZigzag_intra.c |
| * OpenMAX DL: v1.0.2 |
| * Revision: 9641 |
| * Date: Thursday, February 7, 2008 |
| * |
| * |
| * |
| * |
| * Description: |
| * Contains modules for filling of the coefficient buffer |
| * |
| */ |
| |
| #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: armVCM4P2_DecodeVLCZigzag_Intra |
| * |
| * Description: |
| * Performs VLC decoding and inverse zigzag scan for one intra coded block. |
| * |
| * Remarks: |
| * |
| * Parameters: |
| * [in] ppBitStream pointer to the pointer to the current byte in |
| * the bitstream buffer |
| * [in] pBitOffset pointer to the bit position in the byte pointed |
| * to by *ppBitStream. *pBitOffset is valid within |
| * [0-7]. |
| * [in] predDir AC prediction direction which is used to decide |
| * the zigzag scan pattern. It takes one of the |
| * following values: |
| * OMX_VC_NONE AC prediction not used; |
| * perform classical zigzag scan; |
| * OMX_VC_HORIZONTAL Horizontal prediction; |
| * perform alternate-vertical |
| * zigzag scan; |
| * OMX_VC_VERTICAL Vertical prediction; |
| * thus perform |
| * alternate-horizontal |
| * zigzag scan. |
| * [in] start start indicates whether the encoding begins with 0th element |
| * or 1st. |
| * [out] ppBitStream *ppBitStream is updated after the block is |
| * decoded, so that it points to the current byte |
| * in the bit stream buffer |
| * [out] pBitOffset *pBitOffset is updated so that it points to the |
| * current bit position in the byte pointed by |
| * *ppBitStream |
| * [out] pDst pointer to the coefficient buffer of current |
| * block. Should be 32-bit aligned |
| * |
| * Return Value: |
| * Standard OMXResult result. See enumeration for possible result codes. |
| * |
| */ |
| |
| OMXResult armVCM4P2_DecodeVLCZigzag_Intra( |
| const OMX_U8 ** ppBitStream, |
| OMX_INT * pBitOffset, |
| OMX_S16 * pDst, |
| OMX_U8 predDir, |
| OMX_INT shortVideoHeader, |
| OMX_U8 start |
| ) |
| { |
| OMX_U8 last = 0; |
| const OMX_U8 *pZigzagTable = armVCM4P2_aClassicalZigzagScan; |
| OMXResult errorCode; |
| |
| /* Argument error checks */ |
| armRetArgErrIf(ppBitStream == NULL, OMX_Sts_BadArgErr); |
| armRetArgErrIf(*ppBitStream == NULL, OMX_Sts_BadArgErr); |
| armRetArgErrIf(pBitOffset == NULL, OMX_Sts_BadArgErr); |
| armRetArgErrIf(pDst == NULL, OMX_Sts_BadArgErr); |
| armRetArgErrIf(!armIs4ByteAligned(pDst), OMX_Sts_BadArgErr); |
| armRetArgErrIf((*pBitOffset < 0) || (*pBitOffset >7), OMX_Sts_BadArgErr); |
| armRetArgErrIf((predDir > 2), OMX_Sts_BadArgErr); |
| |
| switch (predDir) |
| { |
| case OMX_VC_NONE: |
| { |
| pZigzagTable = armVCM4P2_aClassicalZigzagScan; |
| break; |
| } |
| |
| case OMX_VC_HORIZONTAL: |
| { |
| pZigzagTable = armVCM4P2_aVerticalZigzagScan; |
| break; |
| } |
| |
| case OMX_VC_VERTICAL: |
| { |
| pZigzagTable = armVCM4P2_aHorizontalZigzagScan; |
| break; |
| } |
| } |
| |
| errorCode = armVCM4P2_GetVLCBits ( |
| ppBitStream, |
| pBitOffset, |
| pDst, |
| shortVideoHeader, |
| start, |
| &last, |
| 10, |
| 62, |
| 7, |
| 21, |
| armVCM4P2_IntraL0RunIdx, |
| armVCM4P2_IntraVlcL0, |
| armVCM4P2_IntraL1RunIdx, |
| armVCM4P2_IntraVlcL1, |
| armVCM4P2_IntraL0LMAX, |
| armVCM4P2_IntraL1LMAX, |
| armVCM4P2_IntraL0RMAX, |
| armVCM4P2_IntraL1RMAX, |
| pZigzagTable ); |
| armRetDataErrIf((errorCode != OMX_Sts_NoErr), errorCode); |
| |
| if (last == 0) |
| { |
| return OMX_Sts_Err; |
| } |
| return OMX_Sts_NoErr; |
| } |
| |
| /* End of file */ |
| |