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sound code rewrite for lower sample rates (except mp3s)

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@30 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2007-02-06 22:25:53 +00:00
parent 1cd356a33d
commit 7a93adeb29
9 changed files with 98 additions and 108 deletions
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12
Pico/sound/mix.s
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@ -206,10 +206,10 @@ m16_32_s2_no_unal2:
@ limit
@ reg=int_sample, lr=1, r3=tmp, kills flags
.macro Limit reg
add r3, lr, \reg, asr #16
add r3, lr, \reg, asr #15
bics r3, r3, #1 @ in non-overflow conditions r3 is 0 or 1
movne \reg, #0x8000
submi \reg, \reg, #1
subpl \reg, \reg, #1
.endm
@ -223,11 +223,11 @@ m16_32_s2_no_unal2:
@ mov r3, #0x8000
@ subpl r3, r3, #1
add r3, lr, \reg, asr #16
add r3, lr, \reg, asr #15
bics r3, r3, #1 @ in non-overflow conditions r3 is 0 or 1
moveq \reg, \reg, lsl #16
movne \reg, #0x80000000
submi \reg, \reg, #0x00010000
subpl \reg, \reg, #0x00010000
.endm
@ -292,7 +292,7 @@ mix_32_to_16_mono:
@ check if dest is word aligned
tst r0, #2
beq m32_16_mo_no_unalw
ldrsh r5, [r0], #2
ldrsh r5, [r0]
ldr r4, [r1], #4
sub r2, r2, #1
add r4, r4, r5
@ -339,7 +339,7 @@ m32_16_mo_end:
m32_16_mo_no_unal2:
tst r2, #1
ldmeqfd sp!, {r4-r8,pc}
ldrsh r5, [r0], #2
ldrsh r5, [r0]
ldr r4, [r1], #4
add r4, r4, r5
Limit r4