| /* |
| * 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: omxVCM4P2_DecodeBlockCoef_Inter.c |
| * OpenMAX DL: v1.0.2 |
| * Revision: 9641 |
| * Date: Thursday, February 7, 2008 |
| * |
| * |
| * |
| * |
| * Description: |
| * Contains modules for inter reconstruction |
| * |
| */ |
| |
| |
| #include "omxtypes.h" |
| #include "armOMX.h" |
| #include "omxVC.h" |
| |
| #include "armCOMM.h" |
| |
| |
| /** |
| * Function: omxVCM4P2_DecodeBlockCoef_Inter |
| * |
| * Description: |
| * Decodes the INTER block coefficients. Inverse quantization, inversely zigzag |
| * positioning and IDCT, with appropriate clipping on each step, are performed |
| * on the coefficients. The results (residuals) are placed in a contiguous array |
| * of 64 elements. For INTER block, the output buffer holds the residuals for |
| * further reconstruction. |
| * |
| * Remarks: |
| * |
| * Parameters: |
| * [in] ppBitStream pointer to the pointer to the current byte in |
| * the bit stream buffer. There is no boundary |
| * check for the bit stream buffer. |
| * [in] pBitOffset pointer to the bit position in the byte pointed |
| * to by *ppBitStream. *pBitOffset is valid within |
| * [0-7] |
| * [in] QP quantization parameter |
| * [in] shortVideoHeader a flag indicating presence of short_video_header; |
| * shortVideoHeader==1 indicates using quantization method defined in short |
| * video header mode, and shortVideoHeader==0 indicates normail quantization method. |
| * [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 decoded residual buffer (a contiguous array of 64 elements of |
| * OMX_S16 data type). Must be 16-byte aligned. |
| * |
| * Return Value: |
| * OMX_Sts_NoErr - no error |
| * OMX_Sts_BadArgErr - bad arguments |
| * - At least one of the following pointers is Null: ppBitStream, *ppBitStream, pBitOffset , pDst |
| * - At least one of the below case: |
| * - *pBitOffset exceeds [0,7], QP <= 0; |
| * - pDst not 16-byte aligned |
| * OMX_Sts_Err - status error |
| * |
| */ |
| OMXResult omxVCM4P2_DecodeBlockCoef_Inter( |
| const OMX_U8 ** ppBitStream, |
| OMX_INT * pBitOffset, |
| OMX_S16 * pDst, |
| OMX_INT QP, |
| OMX_INT shortVideoHeader |
| ) |
| { |
| /* 64 elements are needed but to align it to 16 bytes need |
| 15 more elements of padding */ |
| OMX_S16 tempBuf[79]; |
| OMX_S16 *pTempBuf1; |
| OMXResult errorCode; |
| /* Aligning the local buffers */ |
| pTempBuf1 = armAlignTo16Bytes(tempBuf); |
| |
| |
| /* VLD and zigzag */ |
| errorCode = omxVCM4P2_DecodeVLCZigzag_Inter(ppBitStream, pBitOffset, |
| pTempBuf1,shortVideoHeader); |
| armRetDataErrIf((errorCode != OMX_Sts_NoErr), errorCode); |
| |
| /* Dequantization */ |
| errorCode = omxVCM4P2_QuantInvInter_I( |
| pTempBuf1, |
| QP); |
| armRetDataErrIf((errorCode != OMX_Sts_NoErr), errorCode); |
| |
| /* Inverse transform */ |
| errorCode = omxVCM4P2_IDCT8x8blk(pTempBuf1, pDst); |
| armRetDataErrIf((errorCode != OMX_Sts_NoErr), errorCode); |
| |
| return OMX_Sts_NoErr; |
| } |
| |
| /* End of file */ |
| |
| |