| /* |
| * 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_EncodeVLCZigzag_intra.c |
| * OpenMAX DL: v1.0.2 |
| * Revision: 9641 |
| * Date: Thursday, February 7, 2008 |
| * |
| * |
| * |
| * |
| * Description: |
| * Contains modules for zigzag scanning and VLC encoding |
| * for intra block. |
| * |
| */ |
| |
| #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_EncodeVLCZigzag_Intra |
| * |
| * Description: |
| * Performs zigzag scanning and VLC encoding for one intra block. |
| * |
| * Remarks: |
| * |
| * Parameters: |
| * [in] ppBitStream pointer to the pointer to the current byte in |
| * the bit stream |
| * [in] pBitOffset pointer to the bit position in the byte pointed |
| * by *ppBitStream. Valid within 0 to 7. |
| * [in] pQDctBlkCoef pointer to the quantized DCT coefficient |
| * [in] predDir AC prediction direction, which is used to decide |
| * the zigzag scan pattern. This takes one of the |
| * following values: |
| * OMX_VC_NONE AC prediction not used. |
| * Performs classical zigzag |
| * scan. |
| * OMX_VC_HORIZONTAL Horizontal prediction. |
| * Performs alternate-vertical |
| * zigzag scan. |
| * OMX_VC_VERTICAL Vertical prediction. |
| * Performs alternate-horizontal |
| * zigzag scan. |
| * [in] pattern block pattern which is used to decide whether |
| * this block is encoded |
| * [in] start start indicates whether the encoding begins with 0th element |
| * or 1st. |
| * [out] ppBitStream *ppBitStream is updated after the block is encoded, |
| * 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. |
| * |
| * Return Value: |
| * Standard OMXResult result. See enumeration for possible result codes. |
| * |
| */ |
| |
| OMXResult armVCM4P2_EncodeVLCZigzag_Intra( |
| OMX_U8 **ppBitStream, |
| OMX_INT *pBitOffset, |
| const OMX_S16 *pQDctBlkCoef, |
| OMX_U8 predDir, |
| OMX_U8 pattern, |
| OMX_INT shortVideoHeader, |
| OMX_U8 start |
| ) |
| { |
| 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(pQDctBlkCoef == NULL, OMX_Sts_BadArgErr); |
| armRetArgErrIf((*pBitOffset < 0) || (*pBitOffset >7), OMX_Sts_BadArgErr); |
| armRetArgErrIf(start > 1, OMX_Sts_BadArgErr); |
| armRetArgErrIf(predDir > 2, OMX_Sts_BadArgErr); |
| |
| if (pattern) |
| { |
| 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_PutVLCBits ( |
| ppBitStream, |
| pBitOffset, |
| pQDctBlkCoef, |
| shortVideoHeader, |
| start, |
| 14, |
| 20, |
| 9, |
| 6, |
| armVCM4P2_IntraL0RunIdx, |
| armVCM4P2_IntraVlcL0, |
| armVCM4P2_IntraL1RunIdx, |
| armVCM4P2_IntraVlcL1, |
| armVCM4P2_IntraL0LMAX, |
| armVCM4P2_IntraL1LMAX, |
| armVCM4P2_IntraL0RMAX, |
| armVCM4P2_IntraL1RMAX, |
| pZigzagTable |
| ); |
| armRetDataErrIf((errorCode != OMX_Sts_NoErr), errorCode); |
| |
| } /* Pattern check ends*/ |
| |
| return (OMX_Sts_NoErr); |
| |
| } |
| |
| /* End of file */ |