mp3_hdr.mid

来自「君正早期ucos系统(只有早期的才不没有打包成库),MPLAYER,文件系统,图」· MID 代码 · 共 436 行

	.file	1 "mp3_hdr.c"
	.section .mdebug.abi32
	.previous
	.section	.text.mp_mp3_get_lsf,"ax",@progbits
	.align	2
	.align	5
	.globl	mp_mp3_get_lsf
	.ent	mp_mp3_get_lsf
	.type	mp_mp3_get_lsf, @function
mp_mp3_get_lsf:
	.frame	$sp,0,$31		# vars= 0, regs= 0/0, args= 0, gp= 0
	.mask	0x00000000,0
	.fmask	0x00000000,0
	.set	noreorder
	.set	nomacro
	
	lbu	$3,0($4)
	lbu	$5,1($4)
	lbu	$6,3($4)
	lbu	$2,2($4)
	sll	$3,$3,24
	sll	$5,$5,16
	or	$3,$3,$5
	or	$3,$3,$6
	sll	$2,$2,8
	or	$2,$2,$3
	li	$3,1048576			# 0x100000
	srl	$4,$2,19
	and	$2,$2,$3
	xori	$4,$4,0x1
	beq	$2,$0,$L4
	li	$3,1			# 0x1

	andi	$3,$4,0x1
$L4:
	j	$31
	move	$2,$3

	.set	macro
	.set	reorder
	.end	mp_mp3_get_lsf
	.section	.rodata.str1.4,"aMS",@progbits,1
	.align	2
$LC0:
	.ascii	"head_check failed\012\000"
	.align	2
$LC1:
	.ascii	"not layer-1/2/3\012\000"
	.align	2
$LC2:
	.ascii	"invalid sampling_frequency\012\000"
	.align	2
$LC3:
	.ascii	"FRAMESIZE: %d, layer: %d, bitrate: %d, mult: %d\012\000"
	.align	2
$LC4:
	.ascii	"invalid framesize/bitrate_index\012\000"
	.section	.text.mp_get_mp3_header,"ax",@progbits
	.align	2
	.align	5
	.globl	mp_get_mp3_header
	.ent	mp_get_mp3_header
	.type	mp_get_mp3_header, @function
mp_get_mp3_header:
	.frame	$sp,88,$31		# vars= 16, regs= 10/0, args= 32, gp= 0
	.mask	0xc0ff0000,-4
	.fmask	0x00000000,0
	.set	noreorder
	.set	nomacro
	
	addiu	$sp,$sp,-88
	sw	$fp,80($sp)
	sw	$16,48($sp)
	sw	$31,84($sp)
	sw	$23,76($sp)
	sw	$22,72($sp)
	sw	$21,68($sp)
	sw	$20,64($sp)
	sw	$19,60($sp)
	sw	$18,56($sp)
	sw	$17,52($sp)
	lbu	$2,0($4)
	lbu	$3,1($4)
	lbu	$9,3($4)
	lbu	$8,2($4)
	sll	$3,$3,16
	sll	$2,$2,24
	lui	$4,%hi(C.26.2719)
	or	$2,$2,$3
	or	$2,$2,$9
	addiu	$3,$4,%lo(C.26.2719)
	sll	$8,$8,8
	or	$16,$8,$2
	lw	$9,8($3)
	lw	$2,%lo(C.26.2719)($4)
	lw	$8,4($3)
	li	$4,-2097152			# 0xffffffffffe00000
	and	$3,$16,$4
	sw	$2,32($sp)
	sw	$8,36($sp)
	sw	$9,40($sp)
	sw	$5,92($sp)
	sw	$6,96($sp)
	bne	$3,$4,$L43
	move	$fp,$7

	srl	$2,$16,17
	andi	$2,$2,0x3
	li	$3,4			# 0x4
	subu	$18,$3,$2
	beq	$18,$3,$L44
	srl	$2,$16,10

	andi	$4,$2,0x3
	li	$3,3			# 0x3
	beq	$4,$3,$L45
	li	$2,1048576			# 0x100000

	and	$2,$16,$2
	beq	$2,$0,$L15
	addiu	$21,$4,6

	srl	$2,$16,19
	xori	$2,$2,0x1
	andi	$19,$2,0x1
	sll	$3,$19,1
	addu	$2,$3,$19
	addu	$21,$4,$2
$L17:
	addiu	$5,$18,-1
	addu	$3,$3,$19
	addu	$3,$3,$5
	srl	$2,$16,12
	andi	$2,$2,0xf
	sll	$3,$3,4
	addu	$3,$3,$2
	lui	$2,%hi(tabsel_123)
	sll	$5,$5,2
	addiu	$2,$2,%lo(tabsel_123)
	sll	$3,$3,2
	addu	$3,$3,$2
	addu	$4,$sp,$5
	lw	$8,32($4)
	lw	$20,0($3)
	srl	$3,$16,6
	mul	$17,$20,$8
	andi	$3,$3,0x3
	lui	$6,%hi($LC3)
	li	$22,1			# 0x1
	xori	$3,$3,0x3
	li	$2,2			# 0x2
	move	$23,$22
	addiu	$6,$6,%lo($LC3)
	li	$4,5			# 0x5
	li	$5,7			# 0x7
	move	$7,$17
	movn	$23,$2,$3
	sw	$8,24($sp)
	sw	$18,16($sp)
	jal	mp_msg
	sw	$20,20($sp)

	beq	$17,$0,$L46
	li	$2,3			# 0x3

	srl	$3,$16,9
	beq	$18,$2,$L47
	andi	$7,$3,0x1

	lui	$5,%hi(freqs)
	sll	$4,$21,2
	addiu	$2,$5,%lo(freqs)
	addu	$2,$4,$2
	lw	$3,0($2)
	div	$0,$17,$3
	teq	$3,$0,7
	beq	$18,$22,$L48
	mflo	$2

$L25:
	addu	$3,$7,$2
$L27:
	lw	$2,96($sp)
	beq	$2,$0,$L28
	addiu	$2,$5,%lo(freqs)

	addu	$2,$4,$2
	lw	$4,0($2)
	lw	$2,96($sp)
	beq	$fp,$0,$L28
	sw	$4,0($2)

	li	$2,1			# 0x1
	beq	$18,$2,$L49
	li	$2,2			# 0x2

	beq	$18,$2,$L35
	slt	$2,$4,32000

	bne	$2,$0,$L50
	li	$2,576			# 0x240

$L35:
	li	$2,1152			# 0x480
	sw	$2,0($fp)
$L28:
	lw	$2,104($sp)
	beq	$2,$0,$L37
	nop

	sw	$18,0($2)
$L37:
	lw	$2,92($sp)
	beq	$2,$0,$L39
	nop

	sw	$23,0($2)
$L39:
	lw	$2,108($sp)
	beq	$2,$0,$L51
	lw	$31,84($sp)

	sw	$20,0($2)
$L10:
	lw	$31,84($sp)
$L51:
	lw	$fp,80($sp)
	lw	$23,76($sp)
	lw	$22,72($sp)
	lw	$21,68($sp)
	lw	$20,64($sp)
	lw	$19,60($sp)
	lw	$18,56($sp)
	lw	$17,52($sp)
	lw	$16,48($sp)
	move	$2,$3
	j	$31
	addiu	$sp,$sp,88

$L15:
	li	$19,1			# 0x1
	j	$L17
	li	$3,2			# 0x2

$L47:
	lui	$5,%hi(freqs)
	sll	$4,$21,2
	addiu	$2,$5,%lo(freqs)
	addu	$2,$4,$2
	lw	$3,0($2)
	sll	$3,$3,$19
	div	$0,$17,$3
	teq	$3,$0,7
	j	$L25
	mflo	$2

$L48:
	addu	$2,$7,$2
	j	$L27
	sll	$3,$2,2

$L50:
	j	$L28
	sw	$2,0($fp)

$L49:
	li	$2,384			# 0x180
	j	$L28
	sw	$2,0($fp)

$L43:
	lui	$6,%hi($LC0)
	addiu	$6,$6,%lo($LC0)
	li	$4,5			# 0x5
	jal	mp_msg
	li	$5,7			# 0x7

	j	$L10
	li	$3,-1			# 0xffffffffffffffff

$L46:
	lui	$6,%hi($LC4)
	addiu	$6,$6,%lo($LC4)
	li	$4,5			# 0x5
	jal	mp_msg
	li	$5,7			# 0x7

	j	$L10
	li	$3,-1			# 0xffffffffffffffff

$L44:
	lui	$6,%hi($LC1)
	addiu	$6,$6,%lo($LC1)
	li	$4,5			# 0x5
	jal	mp_msg
	li	$5,7			# 0x7

	j	$L10
	li	$3,-1			# 0xffffffffffffffff

$L45:
	lui	$6,%hi($LC2)
	addiu	$6,$6,%lo($LC2)
	li	$4,5			# 0x5
	jal	mp_msg
	li	$5,7			# 0x7

	j	$L10
	li	$3,-1			# 0xffffffffffffffff

	.set	macro
	.set	reorder
	.end	mp_get_mp3_header
	.rdata
	.align	2
	.type	tabsel_123, @object
	.size	tabsel_123, 384
tabsel_123:
	.word	0
	.word	32
	.word	64
	.word	96
	.word	128
	.word	160
	.word	192
	.word	224
	.word	256
	.word	288
	.word	320
	.word	352
	.word	384
	.word	416
	.word	448
	.word	0
	.word	0
	.word	32
	.word	48
	.word	56
	.word	64
	.word	80
	.word	96
	.word	112
	.word	128
	.word	160
	.word	192
	.word	224
	.word	256
	.word	320
	.word	384
	.word	0
	.word	0
	.word	32
	.word	40
	.word	48
	.word	56
	.word	64
	.word	80
	.word	96
	.word	112
	.word	128
	.word	160
	.word	192
	.word	224
	.word	256
	.word	320
	.word	0
	.word	0
	.word	32
	.word	48
	.word	56
	.word	64
	.word	80
	.word	96
	.word	112
	.word	128
	.word	144
	.word	160
	.word	176
	.word	192
	.word	224
	.word	256
	.word	0
	.word	0
	.word	8
	.word	16
	.word	24
	.word	32
	.word	40
	.word	48
	.word	56
	.word	64
	.word	80
	.word	96
	.word	112
	.word	128
	.word	144
	.word	160
	.word	0
	.word	0
	.word	8
	.word	16
	.word	24
	.word	32
	.word	40
	.word	48
	.word	56
	.word	64
	.word	80
	.word	96
	.word	112
	.word	128
	.word	144
	.word	160
	.word	0
	.align	2
	.type	freqs, @object
	.size	freqs, 36
freqs:
	.word	44100
	.word	48000
	.word	32000
	.word	22050
	.word	24000
	.word	16000
	.word	11025
	.word	12000
	.word	8000
	.align	2
	.type	C.26.2719, @object
	.size	C.26.2719, 12
C.26.2719:
	.word	12000
	.word	144000
	.word	144000
	.ident	"GCC: (GNU) 4.1.2"