| /* |
| * 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_QuantInvInter_I.c |
| * OpenMAX DL: v1.0.2 |
| * Revision: 9641 |
| * Date: Thursday, February 7, 2008 |
| * |
| * |
| * |
| * |
| * Description: |
| * Contains modules for inter inverse Quantization |
| * |
| */ |
| |
| #include "omxtypes.h" |
| #include "armOMX.h" |
| #include "omxVC.h" |
| |
| #include "armCOMM.h" |
| |
| |
| /** |
| * Function: omxVCM4P2_QuantInvInter_I (6.2.5.3.2) |
| * |
| * Description: |
| * Performs the second inverse quantization mode on an intra/inter coded |
| * block. Supports bits_per_pixel = 8. The output coefficients are clipped to |
| * the range [-2048, 2047]. |
| * |
| * Input Arguments: |
| * |
| * pSrcDst - pointer to the input (quantized) intra/inter block; must be |
| * aligned on a 16-byte boundary. |
| * QP - quantization parameter (quantizer_scale) |
| * videoComp - video component type of the current block. Takes one of the |
| * following flags: OMX_VC_LUMINANCE, OMX_VC_CHROMINANCE (intra |
| * version only). |
| * shortVideoHeader - binary flag indicating presence of short_video_header |
| * (intra version only). |
| * |
| * Output Arguments: |
| * |
| * pSrcDst - pointer to the output (dequantized) intra/inter block |
| * |
| * Return Value: |
| * |
| * OMX_Sts_NoErr - no error |
| * OMX_Sts_BadArgErr - bad arguments; one or more of the following is |
| * true: |
| * - pSrcDst is NULL |
| * - QP <= 0 or QP >=31 |
| * - videoComp is neither OMX_VC_LUMINANCE nor OMX_VC_CHROMINANCE. |
| * |
| */ |
| |
| OMXResult omxVCM4P2_QuantInvInter_I( |
| OMX_S16 * pSrcDst, |
| OMX_INT QP |
| ) |
| { |
| |
| OMX_INT coeffCount, Sign; |
| |
| /* Argument error checks */ |
| armRetArgErrIf(pSrcDst == NULL, OMX_Sts_BadArgErr); |
| armRetArgErrIf(((QP <= 0) || (QP >= 32)), OMX_Sts_BadArgErr); |
| |
| /* Second Inverse quantisation method */ |
| for (coeffCount = 0; coeffCount < 64; coeffCount++) |
| { |
| /* check sign */ |
| Sign = armSignCheck (pSrcDst[coeffCount]); |
| |
| /* Quantize the coeff */ |
| if (QP & 0x1) |
| { |
| pSrcDst[coeffCount] = (2* armAbs(pSrcDst[coeffCount]) + 1) * QP; |
| pSrcDst[coeffCount] *= Sign; |
| } |
| else |
| { |
| pSrcDst[coeffCount] = (2* armAbs(pSrcDst[coeffCount]) + 1) |
| * QP - 1; |
| pSrcDst[coeffCount] *= Sign; |
| } |
| /* Saturate */ |
| pSrcDst[coeffCount] = armClip (-2048, 2047, pSrcDst[coeffCount]); |
| } |
| return OMX_Sts_NoErr; |
| } |
| |
| /* End of file */ |
| |
| |