mp3_hdr.s

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」· S 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"