| /* |
| * 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_TransformDequantLumaDCFromPair.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 Luma DC block |
| */ |
| |
| static void DequantLumaDC4x4( |
| OMX_S16* pDst, |
| OMX_INT QP |
| ) |
| { |
| int Shift = (QP/6)-2 ; |
| int Scale = armVCM4P10_VMatrix[QP%6][0]; |
| int i, Round, Value; |
| |
| if (Shift >= 0) |
| { |
| for (i=0; i<16; i++) |
| { |
| Value = (pDst[i] * Scale) << Shift; |
| pDst[i] = (OMX_S16)Value; |
| } |
| } |
| else |
| { |
| Shift = -Shift;; |
| Round = 1<<(Shift-1); |
| |
| for (i=0; i<16; i++) |
| { |
| Value = (pDst[i] * Scale + Round) >> Shift; |
| pDst[i] = (OMX_S16)Value; |
| } |
| } |
| } |
| |
| |
| |
| /* |
| * Description: |
| * Inverse Transform DC 4x4 Coefficients |
| */ |
| static void InvTransformDC4x4(OMX_S16* pData) |
| { |
| int i; |
| |
| /* Transform rows */ |
| for (i=0; i<16; i+=4) |
| { |
| int c0 = pData[i+0]; |
| int c1 = pData[i+1]; |
| int c2 = pData[i+2]; |
| int c3 = pData[i+3]; |
| pData[i+0] = (OMX_S16)(c0+c1+c2+c3); |
| pData[i+1] = (OMX_S16)(c0+c1-c2-c3); |
| pData[i+2] = (OMX_S16)(c0-c1-c2+c3); |
| pData[i+3] = (OMX_S16)(c0-c1+c2-c3); |
| } |
| |
| /* Transform columns */ |
| for (i=0; i<4; i++) |
| { |
| int c0 = pData[i+0]; |
| int c1 = pData[i+4]; |
| int c2 = pData[i+8]; |
| int c3 = pData[i+12]; |
| pData[i+0] = (OMX_S16)(c0+c1+c2+c3); |
| pData[i+4] = (OMX_S16)(c0+c1-c2-c3); |
| pData[i+8] = (OMX_S16)(c0-c1-c2+c3); |
| pData[i+12] = (OMX_S16)(c0-c1+c2-c3); |
| } |
| } |
| |
| |
| /** |
| * Function: omxVCM4P10_TransformDequantLumaDCFromPair (6.3.4.2.1) |
| * |
| * Description: |
| * Reconstructs the 4x4 LumaDC block from the coefficient-position pair |
| * buffer, performs integer inverse, and dequantization for 4x4 LumaDC |
| * coefficients, and updates the pair buffer pointer to the next non-empty |
| * block. |
| * |
| * Input Arguments: |
| * |
| * ppSrc - Double pointer to residual coefficient-position pair buffer |
| * output by CALVC decoding |
| * QP - Quantization parameter QpY |
| * |
| * Output Arguments: |
| * |
| * ppSrc - *ppSrc is updated to the start of next non empty block |
| * pDst - Pointer to the reconstructed 4x4 LumaDC coefficients buffer; must |
| * be aligned on a 8-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 8 byte aligned. |
| * - QP is not in the range of [0-51]. |
| * |
| */ |
| |
| OMXResult omxVCM4P10_TransformDequantLumaDCFromPair( |
| 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(armNot8ByteAligned(pDst), OMX_Sts_BadArgErr); |
| armRetArgErrIf(QP<0, OMX_Sts_BadArgErr); |
| armRetArgErrIf(QP>51, OMX_Sts_BadArgErr); |
| |
| armVCM4P10_UnpackBlock4x4(ppSrc, pDst); |
| /*InvTransformDequantLumaDC4x4(pDst, QP);*/ |
| InvTransformDC4x4(pDst); |
| DequantLumaDC4x4(pDst, QP); |
| |
| return OMX_Sts_NoErr; |
| } |
| |
| /* End of file */ |