| /* |
| * 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_InvTransformDequant_ChromaDC.c |
| * OpenMAX DL: v1.0.2 |
| * Revision: 9641 |
| * Date: Thursday, February 7, 2008 |
| * |
| * |
| * |
| * Description: |
| * This function will calculate 4x4 hadamard transform of chroma DC |
| * coefficients and quantization |
| * |
| */ |
| |
| #include "omxtypes.h" |
| #include "armOMX.h" |
| #include "omxVC.h" |
| |
| #include "armVC.h" |
| #include "armCOMM.h" |
| |
| /** |
| * Function: omxVCM4P10_InvTransformDequant_ChromaDC (6.3.5.6.4) |
| * |
| * Description: |
| * This function performs inverse 2x2 Hadamard transform and then dequantizes |
| * the coefficients. |
| * |
| * Input Arguments: |
| * |
| * pSrc - Pointer to the 2x2 array of the 2x2 Hadamard-transformed and |
| * quantized coefficients. 8 byte alignment required. |
| * iQP - Quantization parameter; must be in the range [0,51]. |
| * |
| * Output Arguments: |
| * |
| * pDst - Pointer to inverse-transformed and dequantized coefficients. |
| * 8-byte alignment required. |
| * |
| * Return Value: |
| * |
| * OMX_Sts_NoErr - no error |
| * OMX_Sts_BadArgErr - bad arguments; returned if any of the following |
| * conditions are true: |
| * - at least one of the following pointers is NULL: pSrc |
| * - pSrc or pDst is not aligned on an 8-byte boundary |
| * |
| */ |
| OMXResult omxVCM4P10_InvTransformDequant_ChromaDC( |
| const OMX_S16* pSrc, |
| OMX_S16* pDst, |
| OMX_U32 iQP |
| ) |
| { |
| OMX_INT i, j; |
| OMX_S32 m[2][2]; |
| OMX_S32 QPer, V00, Value; |
| |
| /* check for argument error */ |
| armRetArgErrIf(pSrc == NULL, OMX_Sts_BadArgErr) |
| armRetArgErrIf(armNot8ByteAligned(pSrc), OMX_Sts_BadArgErr); |
| armRetArgErrIf(pDst == NULL, OMX_Sts_BadArgErr) |
| armRetArgErrIf(armNot8ByteAligned(pDst), OMX_Sts_BadArgErr); |
| armRetArgErrIf(iQP > 51, OMX_Sts_BadArgErr) |
| |
| /* Inv Hadamard Transform for 2x2 block */ |
| m[0][0] = pSrc[0] + pSrc[1] + pSrc[2] + pSrc[3]; |
| m[0][1] = pSrc[0] - pSrc[1] + pSrc[2] - pSrc[3]; |
| m[1][0] = pSrc[0] + pSrc[1] - pSrc[2] - pSrc[3]; |
| m[1][1] = pSrc[0] - pSrc[1] - pSrc[2] + pSrc[3]; |
| |
| /* Quantization */ |
| /* Scaling */ |
| QPer = iQP / 6; |
| V00 = armVCM4P10_VMatrix [iQP % 6][0]; |
| |
| for (j = 0; j < 2; j++) |
| { |
| for (i = 0; i < 2; i++) |
| { |
| if (QPer < 1) |
| { |
| Value = (m[j][i] * V00) >> 1; |
| } |
| else |
| { |
| Value = (m[j][i] * V00) << (QPer - 1); |
| } |
| |
| pDst[j * 2 + i] = (OMX_S16) Value; |
| } |
| } |
| |
| return OMX_Sts_NoErr; |
| } |
| |
| /***************************************************************************** |
| * END OF FILE |
| *****************************************************************************/ |
| |