sbrqmfak.s

在arm下的AAC解码程序

; ***** BEGIN LICENSE BLOCK *****  
; Source last modified: $Id: sbrqmfak.s,v 1.1 2005/02/26 01:47:35 jrecker Exp $ 
;   
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; will apply. You may also obtain the license terms directly from 
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	AREA	|.text|, CODE, READONLY

CPTR0		RN  r0
DELAY		RN  r1
DIDX		RN  r2
UBUF		RN 	r3
CPTR1		RN  r4
K			RN 	r5
DOFF		RN 	r6
ULO0		RN 	r7
UHI0		RN  r8
ULO1		RN 	r9
UHI1		RN  r10
COEF0		RN  r11
DVAL0		RN  r12
COEF1		RN  r14
DVAL1		RN  r2   ; overlay with DIDX

;void QMFAnalysisConv(int *cTab, int *delay, int dIdx, int *uBuf)
;   see comments in sbrqmf.c

raac_QMFAnalysisConv		FUNCTION
	EXPORT	raac_QMFAnalysisConv
	stmfd	sp!, {r4-r11, r14}

	mov		DOFF, DIDX, lsl #5		; dOff0 = 32*dIdx
	add		DOFF, DOFF, #31			; dOff0 = 32*dIdx + 31
	add		CPTR1, CPTR0, #4*(164)	; cPtr1 = cPtr0 + 164
	
	; special first pass (flip sign for cTab[384], cTab[512])
	ldr		COEF0, [CPTR0], #4
	ldr		COEF1, [CPTR0], #4
	ldr		DVAL0, [DELAY, DOFF, lsl #2]
	subs	DOFF, DOFF, #32
	addlt	DOFF, DOFF, #320
	ldr		DVAL1, [DELAY, DOFF, lsl #2]
	subs	DOFF, DOFF, #32
	addlt	DOFF, DOFF, #320
	smull	ULO0, UHI0, COEF0, DVAL0
	smull	ULO1, UHI1, COEF1, DVAL1

	ldr		COEF0, [CPTR0], #4
	ldr		COEF1, [CPTR0], #4
	ldr		DVAL0, [DELAY, DOFF, lsl #2]
	subs	DOFF, DOFF, #32
	addlt	DOFF, DOFF, #320
	ldr		DVAL1, [DELAY, DOFF, lsl #2]
	subs	DOFF, DOFF, #32
	addlt	DOFF, DOFF, #320
	smlal	ULO0, UHI0, COEF0, DVAL0
	smlal	ULO1, UHI1, COEF1, DVAL1

	ldr		COEF0, [CPTR0], #4
	ldr		COEF1, [CPTR1], #-4
	ldr		DVAL0, [DELAY, DOFF, lsl #2]
	subs	DOFF, DOFF, #32
	addlt	DOFF, DOFF, #320
	ldr		DVAL1, [DELAY, DOFF, lsl #2]
	subs	DOFF, DOFF, #32
	addlt	DOFF, DOFF, #320
	smlal	ULO0, UHI0, COEF0, DVAL0
	smlal	ULO1, UHI1, COEF1, DVAL1

	ldr		COEF0, [CPTR1], #-4
	ldr		COEF1, [CPTR1], #-4
	ldr		DVAL0, [DELAY, DOFF, lsl #2]
	subs	DOFF, DOFF, #32
	addlt	DOFF, DOFF, #320
	ldr		DVAL1, [DELAY, DOFF, lsl #2]
	subs	DOFF, DOFF, #32
	addlt	DOFF, DOFF, #320
	rsb		COEF0, COEF0, #0
	smlal	ULO0, UHI0, COEF0, DVAL0
	smlal	ULO1, UHI1, COEF1, DVAL1

	ldr		COEF0, [CPTR1], #-4
	ldr		COEF1, [CPTR1], #-4
	ldr		DVAL0, [DELAY, DOFF, lsl #2]
	subs	DOFF, DOFF, #32
	addlt	DOFF, DOFF, #320
	ldr		DVAL1, [DELAY, DOFF, lsl #2]
	subs	DOFF, DOFF, #32
	addlt	DOFF, DOFF, #320
	rsb		COEF0, COEF0, #0
	smlal	ULO0, UHI0, COEF0, DVAL0
	smlal	ULO1, UHI1, COEF1, DVAL1

	str		UHI1, [UBUF, #4*32]
	str		UHI0, [UBUF], #4
	sub		DOFF, DOFF, #1

	mov		K, #31

SRC_Loop_Start

	ldr		COEF0, [CPTR0], #4
	ldr		COEF1, [CPTR0], #4
	ldr		DVAL0, [DELAY, DOFF, lsl #2]
	subs	DOFF, DOFF, #32
	addlt	DOFF, DOFF, #320
	ldr		DVAL1, [DELAY, DOFF, lsl #2]
	subs	DOFF, DOFF, #32
	addlt	DOFF, DOFF, #320
	smull	ULO0, UHI0, COEF0, DVAL0
	smull	ULO1, UHI1, COEF1, DVAL1

	ldr		COEF0, [CPTR0], #4
	ldr		COEF1, [CPTR0], #4
	ldr		DVAL0, [DELAY, DOFF, lsl #2]
	subs	DOFF, DOFF, #32
	addlt	DOFF, DOFF, #320
	ldr		DVAL1, [DELAY, DOFF, lsl #2]
	subs	DOFF, DOFF, #32
	addlt	DOFF, DOFF, #320
	smlal	ULO0, UHI0, COEF0, DVAL0
	smlal	ULO1, UHI1, COEF1, DVAL1

	ldr		COEF0, [CPTR0], #4
	ldr		COEF1, [CPTR1], #-4
	ldr		DVAL0, [DELAY, DOFF, lsl #2]
	subs	DOFF, DOFF, #32
	addlt	DOFF, DOFF, #320
	ldr		DVAL1, [DELAY, DOFF, lsl #2]
	subs	DOFF, DOFF, #32
	addlt	DOFF, DOFF, #320
	smlal	ULO0, UHI0, COEF0, DVAL0
	smlal	ULO1, UHI1, COEF1, DVAL1

	ldr		COEF0, [CPTR1], #-4
	ldr		COEF1, [CPTR1], #-4
	ldr		DVAL0, [DELAY, DOFF, lsl #2]
	subs	DOFF, DOFF, #32
	addlt	DOFF, DOFF, #320
	ldr		DVAL1, [DELAY, DOFF, lsl #2]
	subs	DOFF, DOFF, #32
	addlt	DOFF, DOFF, #320
	smlal	ULO0, UHI0, COEF0, DVAL0
	smlal	ULO1, UHI1, COEF1, DVAL1

	ldr		COEF0, [CPTR1], #-4
	ldr		COEF1, [CPTR1], #-4
	ldr		DVAL0, [DELAY, DOFF, lsl #2]
	subs	DOFF, DOFF, #32
	addlt	DOFF, DOFF, #320
	ldr		DVAL1, [DELAY, DOFF, lsl #2]
	subs	DOFF, DOFF, #32
	addlt	DOFF, DOFF, #320
	smlal	ULO0, UHI0, COEF0, DVAL0
	smlal	ULO1, UHI1, COEF1, DVAL1

	str		UHI1, [UBUF, #4*32]
	str		UHI0, [UBUF], #4
	sub		DOFF, DOFF, #1
	
	subs	K, K, #1
	bne		SRC_Loop_Start

	ldmfd	sp!, {r4-r11, pc}
	ENDFUNC

	END