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Diffstat (limited to 'media/libstagefright/codecs/on2/h264dec/omxdl/arm11/api/armCOMM_BitDec_s.h')
| -rw-r--r-- | media/libstagefright/codecs/on2/h264dec/omxdl/arm11/api/armCOMM_BitDec_s.h | 670 |
1 files changed, 670 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/on2/h264dec/omxdl/arm11/api/armCOMM_BitDec_s.h b/media/libstagefright/codecs/on2/h264dec/omxdl/arm11/api/armCOMM_BitDec_s.h new file mode 100644 index 0000000..abb98fc --- /dev/null +++ b/media/libstagefright/codecs/on2/h264dec/omxdl/arm11/api/armCOMM_BitDec_s.h @@ -0,0 +1,670 @@ +;// +;// +;// File Name: armCOMM_BitDec_s.h +;// OpenMAX DL: v1.0.2 +;// Revision: 9641 +;// Date: Thursday, February 7, 2008 +;// +;// (c) Copyright 2007-2008 ARM Limited. All Rights Reserved. +;// +;// +;// +;// OpenMAX optimized bitstream decode module +;// +;// You must include armCOMM_s.h before including this file +;// +;// This module provides macros to perform assembly optimized fixed and +;// variable length decoding from a read-only bitstream. The variable +;// length decode modules take as input a pointer to a table of 16-bit +;// entries of the following format. +;// +;// VLD Table Entry format +;// +;// 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 +;// +------------------------------------------------+ +;// | Len | Symbol | 1 | +;// +------------------------------------------------+ +;// | Offset | 0 | +;// +------------------------------------------------+ +;// +;// If the table entry is a leaf entry then bit 0 set: +;// Len = Number of bits overread (0 to 7) +;// Symbol = Symbol payload (unsigned 12 bits) +;// +;// If the table entry is an internal node then bit 0 is clear: +;// Offset = Number of (16-bit) half words from the table +;// start to the next table node +;// +;// The table is accessed by successive lookup up on the +;// next Step bits of the input bitstream until a leaf node +;// is obtained. The Step sizes are supplied to the VLD macro. +;// +;// USAGE: +;// +;// To use any of the macros in this package, first call: +;// +;// M_BD_INIT ppBitStream, pBitOffset, pBitStream, RBitBuffer, RBitCount, Tmp +;// +;// This caches the current bitstream position and next available +;// bits in registers pBitStream, RBitBuffer, RBitCount. These registers +;// are reserved for use by the bitstream decode package until you +;// call M_BD_FINI. +;// +;// Next call the following macro(s) as many times as you need: +;// +;// M_BD_LOOK8 - Look ahead constant 1<=N<=8 bits into the bitstream +;// M_BD_LOOK16 - Look ahead constant 1<=N<=16 bits into the bitstream +;// M_BD_READ8 - Read constant 1<=N<=8 bits from the bitstream +;// M_BD_READ16 - Read constant 1<=N<=16 bits from the bitstream +;// M_BD_VREAD8 - Read variable 1<=N<=8 bits from the bitstream +;// M_BD_VREAD16 - Read variable 1<=N<=16 bits from the bitstream +;// M_BD_VLD - Perform variable length decode using lookup table +;// +;// Finally call the macro: +;// +;// M_BD_FINI ppBitStream, pBitOffset +;// +;// This writes the bitstream state back to memory. +;// +;// The three bitstream cache register names are assigned to the following global +;// variables: +;// + + GBLS pBitStream ;// Register name for pBitStream + GBLS BitBuffer ;// Register name for BitBuffer + GBLS BitCount ;// Register name for BitCount + +;// +;// These register variables must have a certain defined state on entry to every bitstream +;// macro (except M_BD_INIT) and on exit from every bitstream macro (except M_BD_FINI). +;// The state may depend on implementation. +;// +;// For the default (ARM11) implementation the following hold: +;// pBitStream - points to the first byte not held in the BitBuffer +;// BitBuffer - is a cache of (4 bytes) 32 bits, bit 31 the first bit +;// BitCount - is offset (from the top bit) to the next unused bitstream bit +;// 0<=BitCount<=15 (so BitBuffer holds at least 17 unused bits) +;// +;// + + ;// Bitstream Decode initialise + ;// + ;// Initialises the bitstream decode global registers from + ;// bitstream pointers. This macro is split into 3 parts to enable + ;// scheduling. + ;// + ;// Input Registers: + ;// + ;// $ppBitStream - pointer to pointer to the next bitstream byte + ;// $pBitOffset - pointer to the number of bits used in the current byte (0..7) + ;// $RBitStream - register to use for pBitStream (can be $ppBitStream) + ;// $RBitBuffer - register to use for BitBuffer + ;// $RBitCount - register to use for BitCount (can be $pBitOffset) + ;// + ;// Output Registers: + ;// + ;// $T1,$T2,$T3 - registers that must be preserved between calls to + ;// M_BD_INIT1 and M_BD_INIT2 + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + MACRO + M_BD_INIT0 $ppBitStream, $pBitOffset, $RBitStream, $RBitBuffer, $RBitCount + +pBitStream SETS "$RBitStream" +BitBuffer SETS "$RBitBuffer" +BitCount SETS "$RBitCount" + + ;// load inputs + LDR $pBitStream, [$ppBitStream] + LDR $BitCount, [$pBitOffset] + MEND + + MACRO + M_BD_INIT1 $T1, $T2, $T3 + LDRB $T2, [$pBitStream, #2] + LDRB $T1, [$pBitStream, #1] + LDRB $BitBuffer, [$pBitStream], #3 + ADD $BitCount, $BitCount, #8 + MEND + + MACRO + M_BD_INIT2 $T1, $T2, $T3 + ORR $T2, $T2, $T1, LSL #8 + ORR $BitBuffer, $T2, $BitBuffer, LSL #16 + MEND + + ;// + ;// Look ahead fixed 1<=N<=8 bits without consuming any bits + ;// The next bits will be placed at bit 31..24 of destination register + ;// + ;// Input Registers: + ;// + ;// $N - number of bits to look + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + ;// Output Registers: + ;// + ;// $Symbol - the next N bits of the bitstream + ;// $T1 - corrupted temp/scratch register + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + MACRO + M_BD_LOOK8 $Symbol, $N + ASSERT ($N>=1):LAND:($N<=8) + MOV $Symbol, $BitBuffer, LSL $BitCount + MEND + + ;// + ;// Look ahead fixed 1<=N<=16 bits without consuming any bits + ;// The next bits will be placed at bit 31..16 of destination register + ;// + ;// Input Registers: + ;// + ;// $N - number of bits to look + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + ;// Output Registers: + ;// + ;// $Symbol - the next N bits of the bitstream + ;// $T1 - corrupted temp/scratch register + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + MACRO + M_BD_LOOK16 $Symbol, $N, $T1 + ASSERT ($N >= 1):LAND:($N <= 16) + MOV $Symbol, $BitBuffer, LSL $BitCount + MEND + + ;// + ;// Skips fixed 1<=N<=8 bits from the bitstream, advancing the bitstream pointer + ;// + ;// Input Registers: + ;// + ;// $N - number of bits + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + ;// Output Registers: + ;// + ;// $T1 - corrupted temp/scratch register + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + MACRO + M_BD_SKIP8 $N, $T1 + ASSERT ($N>=1):LAND:($N<=8) + SUBS $BitCount, $BitCount, #(8-$N) + LDRCSB $T1, [$pBitStream], #1 + ADDCC $BitCount, $BitCount, #8 + ORRCS $BitBuffer, $T1, $BitBuffer, LSL #8 + MEND + + + ;// + ;// Read fixed 1<=N<=8 bits from the bitstream, advancing the bitstream pointer + ;// + ;// Input Registers: + ;// + ;// $N - number of bits to read + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + ;// Output Registers: + ;// + ;// $Symbol - the next N bits of the bitstream + ;// $T1 - corrupted temp/scratch register + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + MACRO + M_BD_READ8 $Symbol, $N, $T1 + ASSERT ($N>=1):LAND:($N<=8) + MOVS $Symbol, $BitBuffer, LSL $BitCount + SUBS $BitCount, $BitCount, #(8-$N) + LDRCSB $T1, [$pBitStream], #1 + ADDCC $BitCount, $BitCount, #8 + MOV $Symbol, $Symbol, LSR #(32-$N) + ORRCS $BitBuffer, $T1, $BitBuffer, LSL #8 + MEND + + ;// + ;// Read fixed 1<=N<=16 bits from the bitstream, advancing the bitstream pointer + ;// + ;// Input Registers: + ;// + ;// $N - number of bits to read + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + ;// Output Registers: + ;// + ;// $Symbol - the next N bits of the bitstream + ;// $T1 - corrupted temp/scratch register + ;// $T2 - corrupted temp/scratch register + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + MACRO + M_BD_READ16 $Symbol, $N, $T1, $T2 + ASSERT ($N>=1):LAND:($N<=16) + ASSERT $Symbol<>$T1 + IF ($N<=8) + M_BD_READ8 $Symbol, $N, $T1 + ELSE + ;// N>8 so we will be able to refill at least one byte + LDRB $T1, [$pBitStream], #1 + MOVS $Symbol, $BitBuffer, LSL $BitCount + ORR $BitBuffer, $T1, $BitBuffer, LSL #8 + SUBS $BitCount, $BitCount, #(16-$N) + LDRCSB $T1, [$pBitStream], #1 + MOV $Symbol, $Symbol, LSR #(32-$N) + ADDCC $BitCount, $BitCount, #8 + ORRCS $BitBuffer, $T1, $BitBuffer, LSL #8 + ENDIF + MEND + + ;// + ;// Skip variable 1<=N<=8 bits from the bitstream, advancing the bitstream pointer. + ;// + ;// Input Registers: + ;// + ;// $N - number of bits. 1<=N<=8 + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + ;// Output Registers: + ;// + ;// $T1 - corrupted temp/scratch register + ;// $T2 - corrupted temp/scratch register + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + MACRO + M_BD_VSKIP8 $N, $T1 + ADD $BitCount, $BitCount, $N + SUBS $BitCount, $BitCount, #8 + LDRCSB $T1, [$pBitStream], #1 + ADDCC $BitCount, $BitCount, #8 + ORRCS $BitBuffer, $T1, $BitBuffer, LSL #8 + MEND + + ;// + ;// Skip variable 1<=N<=16 bits from the bitstream, advancing the bitstream pointer. + ;// + ;// Input Registers: + ;// + ;// $N - number of bits. 1<=N<=16 + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + ;// Output Registers: + ;// + ;// $T1 - corrupted temp/scratch register + ;// $T2 - corrupted temp/scratch register + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + MACRO + M_BD_VSKIP16 $N, $T1, $T2 + ADD $BitCount, $BitCount, $N + SUBS $BitCount, $BitCount, #8 + LDRCSB $T1, [$pBitStream], #1 + ORRCS $BitBuffer, $T1, $BitBuffer, LSL #8 + SUBCSS $BitCount, $BitCount, #8 + LDRCSB $T1, [$pBitStream], #1 + ADDCC $BitCount, $BitCount, #8 + ORRCS $BitBuffer, $T1, $BitBuffer, LSL #8 + MEND + + ;// + ;// Read variable 1<=N<=8 bits from the bitstream, advancing the bitstream pointer. + ;// + ;// Input Registers: + ;// + ;// $N - number of bits to read. 1<=N<=8 + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + ;// Output Registers: + ;// + ;// $Symbol - the next N bits of the bitstream + ;// $T1 - corrupted temp/scratch register + ;// $T2 - corrupted temp/scratch register + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + MACRO + M_BD_VREAD8 $Symbol, $N, $T1, $T2 + MOV $Symbol, $BitBuffer, LSL $BitCount + ADD $BitCount, $BitCount, $N + SUBS $BitCount, $BitCount, #8 + LDRCSB $T1, [$pBitStream], #1 + RSB $T2, $N, #32 + ADDCC $BitCount, $BitCount, #8 + MOV $Symbol, $Symbol, LSR $T2 + ORRCS $BitBuffer, $T1, $BitBuffer, LSL #8 + MEND + + + ;// + ;// Read variable 1<=N<=16 bits from the bitstream, advancing the bitstream pointer. + ;// + ;// Input Registers: + ;// + ;// $N - number of bits to read. 1<=N<=16 + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + ;// Output Registers: + ;// + ;// $Symbol - the next N bits of the bitstream + ;// $T1 - corrupted temp/scratch register + ;// $T2 - corrupted temp/scratch register + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + MACRO + M_BD_VREAD16 $Symbol, $N, $T1, $T2 + MOV $Symbol, $BitBuffer, LSL $BitCount + ADD $BitCount, $BitCount, $N + SUBS $BitCount, $BitCount, #8 + LDRCSB $T1, [$pBitStream], #1 + RSB $T2, $N, #32 + ORRCS $BitBuffer, $T1, $BitBuffer, LSL #8 + SUBCSS $BitCount, $BitCount, #8 + LDRCSB $T1, [$pBitStream], #1 + ADDCC $BitCount, $BitCount, #8 + MOV $Symbol, $Symbol, LSR $T2 + ORRCS $BitBuffer, $T1, $BitBuffer, LSL #8 + MEND + + + ;// + ;// Decode a code of the form 0000...001 where there + ;// are N zeros before the 1 and N<=15 (code length<=16) + ;// + ;// Input Registers: + ;// + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + ;// Output Registers: + ;// + ;// $Symbol - the number of zeros before the next 1 + ;// >=16 is an illegal code + ;// $T1 - corrupted temp/scratch register + ;// $T2 - corrupted temp/scratch register + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + MACRO + M_BD_CLZ16 $Symbol, $T1, $T2 + MOVS $Symbol, $BitBuffer, LSL $BitCount + CLZ $Symbol, $Symbol + ADD $BitCount, $BitCount, $Symbol + SUBS $BitCount, $BitCount, #7 ;// length is Symbol+1 + LDRCSB $T1, [$pBitStream], #1 + ORRCS $BitBuffer, $T1, $BitBuffer, LSL #8 + SUBCSS $BitCount, $BitCount, #8 + LDRCSB $T1, [$pBitStream], #1 + ADDCC $BitCount, $BitCount, #8 + ORRCS $BitBuffer, $T1, $BitBuffer, LSL #8 + MEND + + ;// + ;// Decode a code of the form 1111...110 where there + ;// are N ones before the 0 and N<=15 (code length<=16) + ;// + ;// Input Registers: + ;// + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + ;// Output Registers: + ;// + ;// $Symbol - the number of zeros before the next 1 + ;// >=16 is an illegal code + ;// $T1 - corrupted temp/scratch register + ;// $T2 - corrupted temp/scratch register + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + MACRO + M_BD_CLO16 $Symbol, $T1, $T2 + MOV $Symbol, $BitBuffer, LSL $BitCount + MVN $Symbol, $Symbol + CLZ $Symbol, $Symbol + ADD $BitCount, $BitCount, $Symbol + SUBS $BitCount, $BitCount, #7 ;// length is Symbol+1 + LDRCSB $T1, [$pBitStream], #1 + ORRCS $BitBuffer, $T1, $BitBuffer, LSL #8 + SUBCSS $BitCount, $BitCount, #8 + LDRCSB $T1, [$pBitStream], #1 + ADDCC $BitCount, $BitCount, #8 + ORRCS $BitBuffer, $T1, $BitBuffer, LSL #8 + MEND + + + ;// + ;// Variable Length Decode module + ;// + ;// Decodes one VLD Symbol from a bitstream and refill the bitstream + ;// buffer. + ;// + ;// Input Registers: + ;// + ;// $pVLDTable - pointer to VLD decode table of 16-bit entries. + ;// The format is described above at the start of + ;// this file. + ;// $S0 - The number of bits to look up for the first step + ;// 1<=$S0<=8 + ;// $S1 - The number of bits to look up for each subsequent + ;// step 1<=$S1<=$S0. + ;// + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + ;// Output Registers: + ;// + ;// $Symbol - decoded VLD symbol value + ;// $T1 - corrupted temp/scratch register + ;// $T2 - corrupted temp/scratch register + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + MACRO + M_BD_VLD $Symbol, $T1, $T2, $pVLDTable, $S0, $S1 + ASSERT (1<=$S0):LAND:($S0<=8) + ASSERT (1<=$S1):LAND:($S1<=$S0) + + ;// Note 0<=BitCount<=15 on entry and exit + + MOVS $T1, $BitBuffer, LSL $BitCount ;// left align next bits + MOVS $Symbol, #(2<<$S0)-2 ;// create mask + AND $Symbol, $Symbol, $T1, LSR #(31-$S0) ;// 2*(next $S0 bits) + SUBS $BitCount, $BitCount, #8 ;// CS if buffer can be filled +01 + LDRCSB $T1, [$pBitStream], #1 ;// load refill byte + LDRH $Symbol, [$pVLDTable, $Symbol] ;// load table entry + ADDCC $BitCount, $BitCount, #8 ;// refill not possible + ADD $BitCount, $BitCount, #$S0 ;// assume $S0 bits used + ORRCS $BitBuffer, $T1, $BitBuffer, LSL #8 ;// merge in refill byte + MOVS $T1, $Symbol, LSR #1 ;// CS=leaf entry + BCS %FT02 + + MOVS $T1, $BitBuffer, LSL $BitCount ;// left align next bit + IF (2*$S0-$S1<=8) + ;// Can combine refill check and -S0+S1 and keep $BitCount<=15 + SUBS $BitCount, $BitCount, #8+($S0-$S1) + ELSE + ;// Separate refill check and -S0+S1 offset + SUBS $BitCount, $BitCount, #8 + SUB $BitCount, $BitCount, #($S0-$S1) + ENDIF + ADD $Symbol, $Symbol, $T1, LSR #(31-$S1) ;// add 2*(next $S1 bits) to + BIC $Symbol, $Symbol, #1 ;// table offset + B %BT01 ;// load next table entry +02 + ;// BitCount range now depend on the route here + ;// if (first step) S0 <= BitCount <= 7+S0 <=15 + ;// else if (2*S0-S1<=8) S0 <= BitCount <= 7+(2*S0-S1) <=15 + ;// else S1 <= BitCount <= 7+S1 <=15 + + SUB $BitCount, $BitCount, $Symbol, LSR#13 + BIC $Symbol, $T1, #0xF000 + MEND + + + ;// Add an offset number of bits + ;// + ;// Outputs destination byte and bit index values which corresponds to an offset number of bits + ;// from the current location. This is used to compare bitstream positions using. M_BD_CMP. + ;// + ;// Input Registers: + ;// + ;// $Offset - Offset to be added in bits. + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + ;// Output Registers: + ;// + ;// $ByteIndex - Destination pBitStream pointer after adding the Offset. + ;// This value will be 4 byte ahead and needs to subtract by 4 to get exact + ;// pointer (as in M_BD_FINI). But for using with M_BD_CMP subtract is not needed. + ;// $BitIndex - Destination BitCount after the addition of Offset number of bits + ;// + MACRO + M_BD_ADD $ByteIndex, $BitIndex, $Offset + + ;// ($ByteIndex,$BitIndex) = Current position + $Offset bits + ADD $Offset, $Offset, $BitCount + AND $BitIndex, $Offset, #7 + ADD $ByteIndex, $pBitStream, $Offset, ASR #3 + MEND + + ;// Move bitstream pointers to the location given + ;// + ;// Outputs destination byte and bit index values which corresponds to + ;// the current location given (calculated using M_BD_ADD). + ;// + ;// Input Registers: + ;// + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// $ByteIndex - Destination pBitStream pointer after move. + ;// This value will be 4 byte ahead and needs to subtract by 4 to get exact + ;// pointer (as in M_BD_FINI). + ;// $BitIndex - Destination BitCount after the move + ;// + ;// Output Registers: + ;// + ;// $pBitStream \ + ;// } See description above. + ;// $BitCount / + ;// + MACRO + M_BD_MOV $ByteIndex, $BitIndex + + ;// ($pBitStream, $Offset) = ($ByteIndex,$BitIndex) + MOV $BitCount, $BitIndex + MOV $pBitStream, $ByteIndex + MEND + + ;// Bitstream Compare + ;// + ;// Compares bitstream position with that of a destination position. Destination position + ;// is held in two input registers which are calculated using M_BD_ADD macro + ;// + ;// Input Registers: + ;// + ;// $ByteIndex - Destination pBitStream pointer, (4 byte ahead as described in M_BD_ADD) + ;// $BitIndex - Destination BitCount + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + ;// Output Registers: + ;// + ;// FLAGS - GE if destination is reached, LT = is destination is ahead + ;// $T1 - corrupted temp/scratch register + ;// + MACRO + M_BD_CMP $ByteIndex, $BitIndex, $T1 + + ;// Return flags set by (current positon)-($ByteIndex,$BitIndex) + ;// so GE means that we have reached the indicated position + + ADD $T1, $pBitStream, $BitCount, LSR #3 + CMP $T1, $ByteIndex + AND $T1, $BitCount, #7 + CMPEQ $T1, $BitIndex + MEND + + + ;// Bitstream Decode finalise + ;// + ;// Writes back the bitstream state to the bitstream pointers + ;// + ;// Input Registers: + ;// + ;// $pBitStream \ + ;// $BitBuffer } See description above. + ;// $BitCount / + ;// + ;// Output Registers: + ;// + ;// $ppBitStream - pointer to pointer to the next bitstream byte + ;// $pBitOffset - pointer to the number of bits used in the current byte (0..7) + ;// $pBitStream \ + ;// $BitBuffer } these register are corrupted + ;// $BitCount / + ;// + MACRO + M_BD_FINI $ppBitStream, $pBitOffset + + ;// Advance pointer by the number of free bits in the buffer + ADD $pBitStream, $pBitStream, $BitCount, LSR#3 + AND $BitCount, $BitCount, #7 + + ;// Now move back 32 bits to reach the first usued bit + SUB $pBitStream, $pBitStream, #4 + + ;// Store out bitstream state + STR $BitCount, [$pBitOffset] + STR $pBitStream, [$ppBitStream] + MEND + + END +
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