| /* |
| * 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_EncodeVLCZigzag_Inter.c |
| * OpenMAX DL: v1.0.2 |
| * Revision: 9641 |
| * Date: Thursday, February 7, 2008 |
| * |
| * |
| * |
| * |
| * Description: |
| * Contains modules for zigzag scanning and VLC encoding |
| * for inter block. |
| * |
| */ |
| |
| #include "omxtypes.h" |
| #include "armOMX.h" |
| #include "omxVC.h" |
| |
| #include "armVC.h" |
| #include "armCOMM_Bitstream.h" |
| #include "armCOMM.h" |
| #include "armVCM4P2_Huff_Tables_VLC.h" |
| #include "armVCM4P2_ZigZag_Tables.h" |
| |
| |
| |
| /** |
| * Function: omxVCM4P2_EncodeVLCZigzag_Inter (6.2.4.5.3) |
| * |
| * Description: |
| * Performs classical zigzag scanning and VLC encoding for one inter block. |
| * |
| * Input Arguments: |
| * |
| * ppBitStream - pointer to the pointer to the current byte in the bit |
| * stream |
| * pBitOffset - pointer to the bit position in the byte pointed by |
| * *ppBitStream. Valid within 0 to 7 |
| * pQDctBlkCoef - pointer to the quantized DCT coefficient |
| * pattern - block pattern which is used to decide whether this block is |
| * encoded |
| * shortVideoHeader - binary flag indicating presence of |
| * short_video_header; escape modes 0-3 are used if |
| * shortVideoHeader==0, and escape mode 4 is used when |
| * shortVideoHeader==1. |
| * |
| * Output Arguments: |
| * |
| * ppBitStream - *ppBitStream is updated after the block is encoded so that |
| * it points to the current byte in the bit stream buffer. |
| * pBitOffset - *pBitOffset is updated so that it points to the current bit |
| * position in the byte pointed by *ppBitStream. |
| * |
| * Return Value: |
| * |
| * OMX_Sts_NoErr - no error |
| * OMX_Sts_BadArgErr - Bad arguments |
| * - At least one of the pointers: is NULL: ppBitStream, *ppBitStream, |
| * pBitOffset, pQDctBlkCoef |
| * - *pBitOffset < 0, or *pBitOffset >7. |
| * |
| */ |
| OMXResult omxVCM4P2_EncodeVLCZigzag_Inter( |
| OMX_U8 **ppBitStream, |
| OMX_INT * pBitOffset, |
| const OMX_S16 *pQDctBlkCoef, |
| OMX_U8 pattern, |
| OMX_INT shortVideoHeader |
| ) |
| { |
| OMX_U8 start = 0; |
| const OMX_U8 *pZigzagTable = armVCM4P2_aClassicalZigzagScan; |
| |
| /* Argument error checks */ |
| armRetArgErrIf(ppBitStream == NULL, OMX_Sts_BadArgErr); |
| armRetArgErrIf(*ppBitStream == NULL, OMX_Sts_BadArgErr); |
| armRetArgErrIf(pBitOffset == NULL, OMX_Sts_BadArgErr); |
| armRetArgErrIf(pQDctBlkCoef == NULL, OMX_Sts_BadArgErr); |
| armRetArgErrIf((*pBitOffset < 0) || (*pBitOffset >7), OMX_Sts_BadArgErr); |
| |
| if (pattern) |
| { |
| armVCM4P2_PutVLCBits ( |
| ppBitStream, |
| pBitOffset, |
| pQDctBlkCoef, |
| shortVideoHeader, |
| start, |
| 26, |
| 40, |
| 10, |
| 1, |
| armVCM4P2_InterL0RunIdx, |
| armVCM4P2_InterVlcL0, |
| armVCM4P2_InterL1RunIdx, |
| armVCM4P2_InterVlcL1, |
| armVCM4P2_InterL0LMAX, |
| armVCM4P2_InterL1LMAX, |
| armVCM4P2_InterL0RMAX, |
| armVCM4P2_InterL1RMAX, |
| pZigzagTable |
| ); |
| } /* Pattern check ends*/ |
| |
| return OMX_Sts_NoErr; |
| |
| } |
| |
| /* End of file */ |