| /* |
| * 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: omxVCM4P10_TransformDequantChromaDCFromPair.c |
| * OpenMAX DL: v1.0.2 |
| * Revision: 9641 |
| * Date: Thursday, February 7, 2008 |
| * |
| * |
| * |
| * |
| * H.264 inverse quantize and transform module |
| * |
| */ |
| |
| #include "omxtypes.h" |
| #include "armOMX.h" |
| #include "omxVC.h" |
| |
| #include "armCOMM.h" |
| #include "armVC.h" |
| |
| /* |
| * Description: |
| * Dequantize Chroma 2x2 DC block |
| */ |
| |
| static void DequantChromaDC2x2( |
| OMX_S16* pDst, |
| OMX_INT QP |
| ) |
| { |
| int Shift = (QP/6)-1 ; |
| int Scale = armVCM4P10_VMatrix[QP%6][0]; |
| int i, Value; |
| |
| if (Shift >= 0) |
| { |
| for (i=0; i<4; i++) |
| { |
| Value = (pDst[i] * Scale) << Shift; |
| pDst[i] = (OMX_S16)Value; |
| } |
| } |
| else |
| { |
| for (i=0; i<4; i++) |
| { |
| Value = (pDst[i] * Scale) >> 1; |
| pDst[i] = (OMX_S16)Value; |
| } |
| } |
| } |
| |
| |
| /* |
| * Description: |
| * Inverse Transform DC 2x2 Coefficients |
| */ |
| |
| static void InvTransformDC2x2(OMX_S16* pData) |
| { |
| int c00 = pData[0]; |
| int c01 = pData[1]; |
| int c10 = pData[2]; |
| int c11 = pData[3]; |
| |
| int d00 = c00 + c01; |
| int d01 = c00 - c01; |
| int d10 = c10 + c11; |
| int d11 = c10 - c11; |
| |
| pData[0] = (OMX_S16)(d00 + d10); |
| pData[1] = (OMX_S16)(d01 + d11); |
| pData[2] = (OMX_S16)(d00 - d10); |
| pData[3] = (OMX_S16)(d01 - d11); |
| } |
| |
| |
| /** |
| * Function: omxVCM4P10_TransformDequantChromaDCFromPair (6.3.4.2.2) |
| * |
| * Description: |
| * Reconstruct the 2x2 ChromaDC block from coefficient-position pair buffer, |
| * perform integer inverse transformation, and dequantization for 2x2 chroma |
| * DC coefficients, and update the pair buffer pointer to next non-empty |
| * block. |
| * |
| * Input Arguments: |
| * |
| * ppSrc - Double pointer to residual coefficient-position pair buffer |
| * output by CALVC decoding |
| * QP - Quantization parameter QpC |
| * |
| * Output Arguments: |
| * |
| * ppSrc - *ppSrc is updated to the start of next non empty block |
| * pDst - Pointer to the reconstructed 2x2 ChromaDC coefficients buffer; |
| * must be aligned on a 4-byte boundary. |
| * |
| * Return Value: |
| * OMX_Sts_NoErr, if the function runs without error. |
| * OMX_Sts_BadArgErr - bad arguments: if one of the following cases occurs: |
| * - ppSrc or pDst is NULL. |
| * - pDst is not 4-byte aligned. |
| * - QP is not in the range of [0-51]. |
| * |
| */ |
| |
| OMXResult omxVCM4P10_TransformDequantChromaDCFromPair( |
| const OMX_U8 **ppSrc, |
| OMX_S16* pDst, |
| OMX_INT QP |
| ) |
| { |
| armRetArgErrIf(ppSrc == NULL, OMX_Sts_BadArgErr); |
| armRetArgErrIf(*ppSrc == NULL, OMX_Sts_BadArgErr); |
| armRetArgErrIf(pDst == NULL, OMX_Sts_BadArgErr); |
| armRetArgErrIf(armNot4ByteAligned(pDst), OMX_Sts_BadArgErr); |
| armRetArgErrIf(QP<0, OMX_Sts_BadArgErr); |
| armRetArgErrIf(QP>51, OMX_Sts_BadArgErr); |
| |
| armVCM4P10_UnpackBlock2x2(ppSrc, pDst); |
| InvTransformDC2x2(pDst); |
| DequantChromaDC2x2(pDst, QP); |
| |
| return OMX_Sts_NoErr; |
| } |
| |
| /* End of file */ |