| /* |
| * 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: armVCM4P2_FillVLCBuffer.c |
| * OpenMAX DL: v1.0.2 |
| * Revision: 9641 |
| * Date: Thursday, February 7, 2008 |
| * |
| * |
| * |
| * |
| * Description: |
| * Contains module for putting VLC bits |
| * |
| */ |
| |
| #include "omxtypes.h" |
| #include "armOMX.h" |
| |
| #include "armVC.h" |
| #include "armCOMM.h" |
| #include "armCOMM_Bitstream.h" |
| |
| /** |
| * Function: armVCM4P2_FillVLCBuffer |
| * |
| * Description: |
| * Performs calculating the VLC bits depending on the escape type and insert |
| * the same in the bitstream |
| * |
| * Remarks: |
| * |
| * Parameters: |
| * [in] ppBitStream pointer to the pointer to the current byte in |
| * the bit stream |
| * [in] pBitOffset pointer to the bit position in the byte pointed |
| * by *ppBitStream. Valid within 0 to 7 |
| * [in] run Run value (count of zeros) to be encoded |
| * [in] level Level value (non-zero value) to be encoded |
| * [in] runPlus Calculated as runPlus = run - (RMAX + 1) |
| * [in] levelPlus Calculated as |
| * levelPlus = sign(level)*[abs(level) - LMAX] |
| * [in] fMode Flag indicating the escape modes |
| * [in] last status of the last flag |
| * [in] maxRunForMultipleEntries |
| * The run value after which level will be equal to 1: |
| * (considering last and inter/intra status) |
| * [in] pRunIndexTable Run Index table defined in |
| * armVCM4P2_Huff_Tables_VLC.h |
| * [in] pVlcTable VLC table defined in armVCM4P2_Huff_Tables_VLC.h |
| * [out] ppBitStream *ppBitStream is updated after the block is encoded |
| * so that it points to the current byte in the bit |
| * stream buffer. |
| * [out] pBitOffset *pBitOffset is updated so that it points to the |
| * current bit position in the byte pointed by |
| * *ppBitStream. |
| * |
| * Return Value: |
| * Standard OMXResult result. See enumeration for possible result codes. |
| * |
| */ |
| |
| OMXResult armVCM4P2_FillVLCBuffer ( |
| OMX_U8 **ppBitStream, |
| OMX_INT * pBitOffset, |
| OMX_U32 run, |
| OMX_S16 level, |
| OMX_U32 runPlus, |
| OMX_S16 levelPlus, |
| OMX_U8 fMode, |
| OMX_U8 last, |
| OMX_U8 maxRunForMultipleEntries, |
| const OMX_U8 *pRunIndexTable, |
| const ARM_VLC32 *pVlcTable |
| ) |
| { |
| OMX_INT tempIndex; |
| OMX_U32 tempRun = run, sign = 0; |
| OMX_S16 tempLevel = level; |
| |
| /* Escape sequence addition */ |
| if (fMode == 1) |
| { |
| armPackBits(ppBitStream, pBitOffset, 3, 7); |
| armPackBits(ppBitStream, pBitOffset, 0, 1); |
| tempLevel = levelPlus; |
| |
| } |
| else if(fMode == 2) |
| { |
| armPackBits(ppBitStream, pBitOffset, 3, 7); |
| armPackBits(ppBitStream, pBitOffset, 2, 2); |
| tempRun = runPlus; |
| } |
| else if (fMode == 3) |
| { |
| armPackBits(ppBitStream, pBitOffset, 3, 7); |
| armPackBits(ppBitStream, pBitOffset, 3, 2); |
| } |
| else if (fMode == 4) |
| { |
| armPackBits(ppBitStream, pBitOffset, 3, 7); |
| armPackBits(ppBitStream, pBitOffset, (OMX_U32)last, 1); |
| armPackBits(ppBitStream, pBitOffset, tempRun, 6); |
| if((tempLevel != 0) && (tempLevel != -128)) |
| { |
| armPackBits(ppBitStream, pBitOffset, |
| (OMX_U32) tempLevel, 8); |
| } |
| return OMX_Sts_NoErr; |
| } |
| |
| if (tempLevel < 0) |
| { |
| sign = 1; |
| tempLevel = armAbs(tempLevel); |
| } |
| /* Putting VLC bits in the stream */ |
| if (fMode < 3) |
| { |
| if (tempRun > maxRunForMultipleEntries) |
| { |
| tempIndex = pRunIndexTable [maxRunForMultipleEntries + 1] + |
| (tempRun - maxRunForMultipleEntries - 1); |
| } |
| else |
| { |
| tempIndex = pRunIndexTable [tempRun] + (tempLevel -1); |
| } |
| |
| armPackVLC32 (ppBitStream, pBitOffset, |
| pVlcTable [tempIndex]); |
| armPackBits(ppBitStream, pBitOffset, (OMX_U32)sign, 1); |
| } |
| else |
| { |
| if (sign) |
| { |
| tempLevel = -tempLevel; |
| } |
| tempRun = run; |
| armPackBits(ppBitStream, pBitOffset, (OMX_U32)last, 1); |
| armPackBits(ppBitStream, pBitOffset, tempRun, 6); |
| armPackBits(ppBitStream, pBitOffset, 1, 1); |
| armPackBits(ppBitStream, pBitOffset, |
| (OMX_U32) tempLevel, 12); |
| armPackBits(ppBitStream, pBitOffset, 1, 1); |
| } |
| return OMX_Sts_NoErr; |
| } |
| |
| /*End of File*/ |
| |