| /* |
| * 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_CheckVLCEscapeMode.c |
| * OpenMAX DL: v1.0.2 |
| * Revision: 9641 |
| * Date: Thursday, February 7, 2008 |
| * |
| * |
| * |
| * |
| * Description: |
| * Contains module for VLC escape mode check |
| * |
| */ |
| |
| #include "omxtypes.h" |
| #include "armOMX.h" |
| |
| #include "armVC.h" |
| #include "armCOMM.h" |
| |
| /** |
| * Function: armVCM4P2_CheckVLCEscapeMode |
| * |
| * Description: |
| * Performs escape mode decision based on the run, run+, level, level+ and |
| * last combinations. |
| * |
| * Remarks: |
| * |
| * Parameters: |
| * [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] maxStoreRun Max store possible (considering last and inter/intra) |
| * [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.c |
| * (considering last and inter/intra status) |
| * |
| * |
| * Return Value: |
| * Returns an Escape mode which can take values from 0 to 3 |
| * 0 --> no escape mode, 1 --> escape type 1, |
| * 1 --> escape type 2, 3 --> escape type 3, check section 7.4.1.3 |
| * in the MPEG ISO standard. |
| * |
| */ |
| |
| OMX_U8 armVCM4P2_CheckVLCEscapeMode( |
| OMX_U32 run, |
| OMX_U32 runPlus, |
| OMX_S16 level, |
| OMX_S16 levelPlus, |
| OMX_U8 maxStoreRun, |
| OMX_U8 maxRunForMultipleEntries, |
| OMX_INT shortVideoHeader, |
| const OMX_U8 *pRunIndexTable |
| ) |
| { |
| OMX_U8 escape = 0, fMode = 0, entries; |
| |
| level = armAbs (level); |
| levelPlus = armAbs (levelPlus); |
| |
| /* Check for a valid entry with run, level and Last combination |
| Mode 0 check */ |
| if (run <= maxStoreRun) |
| { |
| entries = pRunIndexTable[run + 1] |
| - pRunIndexTable[run]; |
| if (run > maxRunForMultipleEntries) |
| { |
| entries = 1; |
| } |
| if (level > entries) |
| { |
| escape = 1; |
| } |
| } |
| else |
| { |
| escape = 1; |
| } |
| if(escape && shortVideoHeader) |
| { |
| escape = 0; |
| fMode = 4; |
| } |
| /* Check for a valid entry with run, levelPlus and Last combination |
| Mode 1 check */ |
| if (escape) |
| { |
| escape = 0; |
| fMode = 1; |
| if (run <= maxStoreRun) |
| { |
| entries = pRunIndexTable[run + 1] |
| - pRunIndexTable[run]; |
| if (run > maxRunForMultipleEntries) |
| { |
| entries = 1; |
| } |
| if (levelPlus > entries) |
| { |
| escape = 1; |
| } |
| } |
| else |
| { |
| escape = 1; |
| } |
| } |
| |
| /* Check for a valid entry with runPlus, level and Last combination |
| Mode 2 check */ |
| if (escape) |
| { |
| escape = 0; |
| fMode = 2; |
| if (runPlus <= maxStoreRun) |
| { |
| entries = pRunIndexTable[runPlus + 1] |
| - pRunIndexTable[runPlus]; |
| if (runPlus > maxRunForMultipleEntries) |
| { |
| entries = 1; |
| } |
| if (level > entries) |
| { |
| escape = 1; |
| } |
| } |
| else |
| { |
| escape = 1; |
| } |
| } |
| |
| /* select mode 3 --> FLC */ |
| if (escape) |
| { |
| fMode = 3; |
| } |
| |
| return fMode; |
| } |
| |
| /*End of File*/ |
| |
