| /* |
| * 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_FindMVpred.c |
| * OpenMAX DL: v1.0.2 |
| * Revision: 9641 |
| * Date: Thursday, February 7, 2008 |
| * |
| * |
| * |
| * |
| * Description: |
| * Contains module for predicting MV of MB |
| * |
| */ |
| |
| #include "omxtypes.h" |
| #include "armOMX.h" |
| #include "omxVC.h" |
| |
| #include "armCOMM.h" |
| |
| /** |
| * Function: omxVCM4P2_FindMVpred (6.2.3.1.1) |
| * |
| * Description: |
| * Predicts a motion vector for the current block using the procedure |
| * specified in [ISO14496-2], subclause 7.6.5. The resulting predicted MV is |
| * returned in pDstMVPred. If the parameter pDstMVPredME if is not NULL then |
| * the set of three MV candidates used for prediction is also returned, |
| * otherwise pDstMVPredMEis NULL upon return. |
| * |
| * Input Arguments: |
| * |
| * pSrcMVCurMB - pointer to the MV buffer associated with the current Y |
| * macroblock; a value of NULL indicates unavailability. |
| * pSrcCandMV1 - pointer to the MV buffer containing the 4 MVs associated |
| * with the MB located to the left of the current MB; set to NULL |
| * if there is no MB to the left. |
| * pSrcCandMV2 - pointer to the MV buffer containing the 4 MVs associated |
| * with the MB located above the current MB; set to NULL if there |
| * is no MB located above the current MB. |
| * pSrcCandMV3 - pointer to the MV buffer containing the 4 MVs associated |
| * with the MB located to the right and above the current MB; set |
| * to NULL if there is no MB located to the above-right. |
| * iBlk - the index of block in the current macroblock |
| * pDstMVPredME - MV candidate return buffer; if set to NULL then |
| * prediction candidate MVs are not returned and pDstMVPredME will |
| * be NULL upon function return; if pDstMVPredME is non-NULL then it |
| * must point to a buffer containing sufficient space for three |
| * return MVs. |
| * |
| * Output Arguments: |
| * |
| * pDstMVPred - pointer to the predicted motion vector |
| * pDstMVPredME - if non-NULL upon input then pDstMVPredME points upon |
| * return to a buffer containing the three motion vector candidates |
| * used for prediction as specified in [ISO14496-2], subclause |
| * 7.6.5, otherwise if NULL upon input then pDstMVPredME is NULL |
| * upon output. |
| * |
| * Return Value: |
| * |
| * OMX_Sts_NoErr - no error |
| * OMX_Sts_BadArgErr - bad arguments; returned under any of the following |
| * conditions: |
| * - the pointer pDstMVPred is NULL |
| * - the parameter iBlk does not fall into the range 0 <= iBlk<=3 |
| * |
| */ |
| |
| OMXResult omxVCM4P2_FindMVpred( |
| const OMXVCMotionVector* pSrcMVCurMB, |
| const OMXVCMotionVector* pSrcCandMV1, |
| const OMXVCMotionVector* pSrcCandMV2, |
| const OMXVCMotionVector* pSrcCandMV3, |
| OMXVCMotionVector* pDstMVPred, |
| OMXVCMotionVector* pDstMVPredME, |
| OMX_INT iBlk |
| ) |
| { |
| OMXVCMotionVector CandMV; |
| const OMXVCMotionVector *pCandMV1; |
| const OMXVCMotionVector *pCandMV2; |
| const OMXVCMotionVector *pCandMV3; |
| |
| /* Argument error checks */ |
| armRetArgErrIf(iBlk!=0 && pSrcMVCurMB == NULL, OMX_Sts_BadArgErr); |
| armRetArgErrIf(pDstMVPred == NULL, OMX_Sts_BadArgErr); |
| armRetArgErrIf((iBlk < 0) || (iBlk > 3), OMX_Sts_BadArgErr); |
| |
| CandMV.dx = CandMV.dy = 0; |
| /* Based on the position of the block extract the motion vectors and |
| the tranperancy status */ |
| |
| |
| /* Set the default value for these to be used if pSrcCandMV[1|2|3] == NULL */ |
| pCandMV1 = pCandMV2 = pCandMV3 = &CandMV; |
| |
| |
| switch (iBlk) |
| { |
| case 0: |
| { |
| if(pSrcCandMV1 != NULL) |
| { |
| pCandMV1 = &pSrcCandMV1[1]; |
| } |
| if(pSrcCandMV2 != NULL) |
| { |
| pCandMV2 = &pSrcCandMV2[2]; |
| } |
| if(pSrcCandMV3 != NULL) |
| { |
| pCandMV3 = &pSrcCandMV3[2]; |
| } |
| if ((pSrcCandMV1 == NULL) && (pSrcCandMV2 == NULL)) |
| { |
| pCandMV1 = pCandMV2 = pCandMV3; |
| } |
| else if((pSrcCandMV1 == NULL) && (pSrcCandMV3 == NULL)) |
| { |
| pCandMV1 = pCandMV3 = pCandMV2; |
| } |
| else if((pSrcCandMV2 == NULL) && (pSrcCandMV3 == NULL)) |
| { |
| pCandMV2 = pCandMV3 = pCandMV1; |
| } |
| break; |
| } |
| case 1: |
| { |
| pCandMV1 = &pSrcMVCurMB[0]; |
| if(pSrcCandMV2 != NULL) |
| { |
| pCandMV2 = &pSrcCandMV2[3]; |
| } |
| if(pSrcCandMV3 != NULL) |
| { |
| pCandMV3 = &pSrcCandMV3[2]; |
| } |
| if((pSrcCandMV2 == NULL) && (pSrcCandMV3 == NULL)) |
| { |
| pCandMV2 = pCandMV3 = pCandMV1; |
| } |
| break; |
| } |
| case 2: |
| { |
| if(pSrcCandMV1 != NULL) |
| { |
| pCandMV1 = &pSrcCandMV1[3]; |
| } |
| pCandMV2 = &pSrcMVCurMB[0]; |
| pCandMV3 = &pSrcMVCurMB[1]; |
| break; |
| } |
| case 3: |
| { |
| pCandMV1 = &pSrcMVCurMB[2]; |
| pCandMV2 = &pSrcMVCurMB[0]; |
| pCandMV3 = &pSrcMVCurMB[1]; |
| break; |
| } |
| } |
| |
| /* Find the median of the 3 candidate MV's */ |
| pDstMVPred->dx = armMedianOf3 (pCandMV1->dx, pCandMV2->dx, pCandMV3->dx); |
| pDstMVPred->dy = armMedianOf3 (pCandMV1->dy, pCandMV2->dy, pCandMV3->dy); |
| |
| if (pDstMVPredME != NULL) |
| { |
| /* Store the candidate MV's into the pDstMVPredME, these can be used |
| in the fast algorithm if implemented */ |
| pDstMVPredME[0].dx = pCandMV1->dx; |
| pDstMVPredME[0].dy = pCandMV1->dy; |
| pDstMVPredME[1].dx = pCandMV2->dx; |
| pDstMVPredME[1].dy = pCandMV2->dy; |
| pDstMVPredME[2].dx = pCandMV3->dx; |
| pDstMVPredME[2].dy = pCandMV3->dy; |
| } |
| |
| return OMX_Sts_NoErr; |
| } |
| |
| |
| /* End of file */ |
| |
