;// ;// 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_DecodeCoeffsToPair_s.s ;// OpenMAX DL: v1.0.2 ;// Revision: 9641 ;// Date: Thursday, February 7, 2008 ;// ;// ;// ;// INCLUDE omxtypes_s.h INCLUDE armCOMM_s.h INCLUDE armCOMM_BitDec_s.h IMPORT armVCM4P10_CAVLCCoeffTokenTables IMPORT armVCM4P10_CAVLCTotalZeroTables IMPORT armVCM4P10_CAVLCTotalZeros2x2Tables IMPORT armVCM4P10_CAVLCRunBeforeTables IMPORT armVCM4P10_SuffixToLevel IMPORT armVCM4P10_ZigZag_4x4 IMPORT armVCM4P10_ZigZag_2x2 M_VARIANTS ARM1136JS ;//DEBUG_ON SETL {TRUE} LAST_COEFF EQU 0x20 ;// End of block flag TWO_BYTE_COEFF EQU 0x10 ;// Declare input registers ppBitStream RN 0 pOffset RN 1 pNumCoeff RN 2 ppPosCoefbuf RN 3 nC RN 4 ;// number of coeffs or 17 for chroma sMaxNumCoeff RN 5 ;// Declare inner loop registers ;// Level loop Count RN 0 TrailingOnes RN 1 pLevel RN 2 LevelSuffix RN 3 SuffixLength RN 4 TotalCoeff RN 5 pVLDTable RN 6 Symbol RN 7 T1 RN 8 T2 RN 9 RBitStream RN 10 RBitBuffer RN 11 RBitCount RN 12 lr RN 14 ;// Run loop Count RN 0 ZerosLeft RN 1 pLevel RN 2 ppRunTable RN 3 pRun RN 4 TotalCoeff RN 5 pVLDTable RN 6 Symbol RN 7 T1 RN 8 T2 RN 9 RBitStream RN 10 RBitBuffer RN 11 RBitCount RN 12 lr RN 14 ;// Fill in coefficients loop pPosCoefbuf RN 0 temp RN 1 pLevel RN 2 ppPosCoefbuf RN 3 pRun RN 4 TotalCoeff RN 5 pZigZag RN 6 T1 RN 8 T2 RN 9 RBitStream RN 10 RBitBuffer RN 11 RBitCount RN 12 CoeffNum RN 14 IF ARM1136JS ;// Allocate stack memory required by the function M_ALLOC4 pppBitStream, 4 M_ALLOC4 ppOffset, 4 M_ALLOC4 pppPosCoefbuf, 4 M_ALLOC4 ppLevel, 16*2 M_ALLOC4 ppRun, 16 ;// Write function header M_START armVCM4P10_DecodeCoeffsToPair, r11 ;// Define stack arguments M_ARG pNC, 4 M_ARG pSMaxNumCoeff,4 ;// Code start M_BD_INIT0 ppBitStream, pOffset, RBitStream, RBitBuffer, RBitCount LDR pVLDTable, =armVCM4P10_CAVLCCoeffTokenTables M_LDR nC, pNC M_BD_INIT1 T1, T2, lr LDR pVLDTable, [pVLDTable, nC, LSL #2] ;// Find VLD table M_BD_INIT2 T1, T2, lr ;// Decode Symbol = TotalCoeff*4 + TrailingOnes M_BD_VLD Symbol, T1, T2, pVLDTable, 4, 2 MOVS TotalCoeff, Symbol, LSR #2 STRB TotalCoeff, [pNumCoeff] M_PRINTF "TotalCoeff=%d\n", TotalCoeff BEQ.W EndNoError ;// Finished if no coefficients CMP Symbol, #17*4 BGE.W EndBadSymbol ;// Error if bad symbol ;// Save bitstream pointers M_STR ppBitStream, pppBitStream M_STR pOffset, ppOffset M_STR ppPosCoefbuf, pppPosCoefbuf ;// Decode Trailing Ones ANDS TrailingOnes, Symbol, #3 M_ADR pLevel, ppLevel M_PRINTF "TrailingOnes=%d\n", TrailingOnes BEQ TrailingOnesDone MOV Count, TrailingOnes TrailingOnesLoop M_BD_READ8 Symbol, 1, T1 SUBS Count, Count, #1 MOV T1, #1 SUB T1, T1, Symbol, LSL #1 M_PRINTF "Level=%d\n", T1 STRH T1, [pLevel], #2 BGT TrailingOnesLoop TrailingOnesDone ;// Decode level values SUBS Count, TotalCoeff, TrailingOnes ;// Number of levels to read BEQ DecodeRuns ;// None left MOV SuffixLength, #1 CMP TotalCoeff, #10 MOVLE SuffixLength, #0 CMP TrailingOnes, #3 ;// if (TrailingOnes<3) MOVLT TrailingOnes, #4 ;// then TrailingOnes = +4 MOVGE TrailingOnes, #2 ;// else TrailingOnes = +2 MOVGE SuffixLength, #0 ;// SuffixLength = 0 LevelLoop M_BD_CLZ16 Symbol, T1, T2 ;// Symbol=LevelPrefix CMP Symbol,#16 BGE EndBadSymbol MOVS lr, SuffixLength ;// if LevelSuffixSize==0 TEQEQ Symbol, #14 ;// and LevelPrefix==14 MOVEQ lr, #4 ;// then LevelSuffixSize=4 TEQ Symbol, #15 ;// if LevelSuffixSize==15 MOVEQ lr, #12 ;// then LevelSuffixSize=12 TEQEQ SuffixLength,#0 ADDEQ Symbol,Symbol,#15 TEQ lr, #0 ;// if LevelSuffixSize==0 BEQ LevelCodeRead ;// LevelCode = LevelPrefix M_BD_VREAD16 LevelSuffix, lr, T1, T2 ;// Read Level Suffix MOV Symbol, Symbol, LSL SuffixLength ADD Symbol, LevelSuffix, Symbol LevelCodeRead ;// Symbol = LevelCode ADD Symbol, Symbol, TrailingOnes ;// +4 if level cannot be +/-1, +2 o/w MOV TrailingOnes, #2 MOVS T1, Symbol, LSR #1 RSBCS T1, T1, #0 ;// If Symbol odd then negate M_PRINTF "Level=%d\n", T1 STRH T1, [pLevel], #2 ;// Store level. LDR T2, =armVCM4P10_SuffixToLevel LDRSB T1, [T2, SuffixLength] ;// Find increment level TEQ SuffixLength, #0 MOVEQ SuffixLength, #1 CMP Symbol, T1 ADDCS SuffixLength, SuffixLength, #1 SUBS Count, Count, #1 BGT LevelLoop DecodeRuns ;// Find number of zeros M_LDR T1, pSMaxNumCoeff ;// sMaxNumCoeff SUB Count, TotalCoeff, #1 ;// Number of runs excluding last SUBS ZerosLeft, T1, TotalCoeff ;// Maximum number of zeros there could be M_ADR pRun, ppRun MOV CoeffNum,TotalCoeff SUB CoeffNum,CoeffNum,#1 BEQ NoZerosLeft ;// Unpack number of zeros from bitstream TEQ T1, #4 LDREQ pVLDTable, =(armVCM4P10_CAVLCTotalZeros2x2Tables-4) LDRNE pVLDTable, =(armVCM4P10_CAVLCTotalZeroTables-4) LDR pVLDTable, [pVLDTable, TotalCoeff, LSL #2] M_BD_VLD Symbol, T1, T2, pVLDTable, 4, 2 ;// Symbol = ZerosLeft CMP Symbol,#16 BGE EndBadSymbol LDR ppRunTable, =(armVCM4P10_CAVLCRunBeforeTables-4) M_ADR pRun, ppRun MOVS ZerosLeft, Symbol ADD CoeffNum,CoeffNum,ZerosLeft BEQ NoZerosLeft ;// Decode runs while zeros are left and more than one coefficient RunLoop SUBS Count, Count, #1 LDR pVLDTable, [ppRunTable, ZerosLeft, LSL#2] BLT LastRun M_BD_VLD Symbol, T1, T2, pVLDTable, 3, 2 ;// Symbol = Run CMP Symbol,#15 BGE EndBadSymbol SUBS ZerosLeft, ZerosLeft, Symbol M_PRINTF "Run=%d\n", Symbol STRB Symbol, [pRun], #1 BGT RunLoop ;// Decode runs while no zeros are left NoZerosLeft SUBS Count, Count, #1 M_PRINTF "Run=%d\n", ZerosLeft STRGEB ZerosLeft, [pRun], #1 BGT NoZerosLeft LastRun ;// Final run length is remaining zeros M_PRINTF "LastRun=%d\n", ZerosLeft STRB ZerosLeft, [pRun], #1 ;// Write coefficients to output array M_LDR T1, pSMaxNumCoeff ;// sMaxNumCoeff TEQ T1, #15 ADDEQ CoeffNum,CoeffNum,#1 SUB pRun,pRun,TotalCoeff SUB pLevel,pLevel,TotalCoeff SUB pLevel,pLevel,TotalCoeff M_LDR ppPosCoefbuf, pppPosCoefbuf LDR pPosCoefbuf, [ppPosCoefbuf] TEQ T1, #4 LDREQ pZigZag, =armVCM4P10_ZigZag_2x2 LDRNE pZigZag, =armVCM4P10_ZigZag_4x4 OutputLoop LDRB T2, [pRun],#1 LDRB T1, [pZigZag, CoeffNum] SUB CoeffNum, CoeffNum, #1 ;// Skip Non zero SUB CoeffNum, CoeffNum, T2 ;// Skip Zero run LDRSH T2, [pLevel],#2 SUBS TotalCoeff, TotalCoeff, #1 ORREQ T1, T1, #LAST_COEFF ADD temp, T2, #128 CMP temp, #256 ORRCS T1, T1, #TWO_BYTE_COEFF TEQ TotalCoeff, #0 ;// Preserves carry M_PRINTF "Output=%02x %04x\n", T1, T2 STRB T1, [pPosCoefbuf], #1 STRB T2, [pPosCoefbuf], #1 MOV T2, T2, LSR #8 STRCSB T2, [pPosCoefbuf], #1 BNE OutputLoop ;// Finished STR pPosCoefbuf, [ppPosCoefbuf] M_LDR ppBitStream, pppBitStream M_LDR pOffset, ppOffset B EndNoError EndBadSymbol MOV r0, #OMX_Sts_Err B End EndNoError ;// Finished reading from the bitstream M_BD_FINI ppBitStream, pOffset ;// Set return value MOV r0, #OMX_Sts_NoErr End M_END ENDIF END