| /* |
| * 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: armVCM4P10_UnpackBlock4x4.c |
| * OpenMAX DL: v1.0.2 |
| * Revision: 9641 |
| * Date: Thursday, February 7, 2008 |
| * |
| * |
| * |
| * |
| * H.264 inverse quantize and transform helper module |
| * |
| */ |
| |
| #include "omxtypes.h" |
| #include "armOMX.h" |
| #include "omxVC.h" |
| |
| #include "armVC.h" |
| |
| /* |
| * Description |
| * Unpack a 4x4 block of coefficient-residual pair values |
| * |
| * Parameters: |
| * [in] ppSrc Double pointer to residual coefficient-position pair |
| * buffer output by CALVC decoding |
| * [out] ppSrc *ppSrc is updated to the start of next non empty block |
| * [out] pDst Pointer to unpacked 4x4 block |
| */ |
| |
| void armVCM4P10_UnpackBlock4x4( |
| const OMX_U8 **ppSrc, |
| OMX_S16* pDst |
| ) |
| { |
| const OMX_U8 *pSrc = *ppSrc; |
| int i; |
| int Flag, Value; |
| |
| for (i=0; i<16; i++) |
| { |
| pDst[i] = 0; |
| } |
| |
| do |
| { |
| Flag = *pSrc++; |
| if (Flag & 0x10) |
| { |
| /* 16 bit */ |
| Value = *pSrc++; |
| Value = Value | ((*pSrc++)<<8); |
| if (Value & 0x8000) |
| { |
| Value -= 0x10000; |
| } |
| } |
| else |
| { |
| /* 8 bit */ |
| Value = *pSrc++; |
| if (Value & 0x80) |
| { |
| Value -= 0x100; |
| } |
| } |
| i = Flag & 15; |
| pDst[i] = (OMX_S16)Value; |
| } |
| while ((Flag & 0x20)==0); |
| |
| *ppSrc = pSrc; |
| } |
| |
| /* End of file */ |
