mirror of
https://github.com/RaySollium99/picodrive.git
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295 lines
6.5 KiB
ArmAsm
295 lines
6.5 KiB
ArmAsm
@ vim:filetype=armasm
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@ Generic routines for mixing audio samples
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@ (c) Copyright 2007, Grazvydas "notaz" Ignotas
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@ this assumes src is word aligned
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.global mix_16h_to_32 @ int *dest, short *src, int count
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mix_16h_to_32:
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stmfd sp!, {r4-r6,lr}
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/*
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tst r1, #2
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beq m16_32_mo_unalw
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ldrsh r4, [r1], #2
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ldr r3, [r0]
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sub r2, r2, #1
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add r3, r3, r4, asr #1
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str r3, [r0], #4
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*/
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m16_32_mo_unalw:
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subs r2, r2, #4
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bmi m16_32_end
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m16_32_loop:
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ldmia r0, {r3-r6}
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ldmia r1!,{r12,lr}
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subs r2, r2, #4
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add r4, r4, r12,asr #17 @ we use half volume
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mov r12,r12,lsl #16
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add r3, r3, r12,asr #17
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add r6, r6, lr, asr #17
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mov lr, lr, lsl #16
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add r5, r5, lr, asr #17
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stmia r0!,{r3-r6}
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bpl m16_32_loop
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m16_32_end:
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tst r2, #2
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beq m16_32_no_unal2
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ldr r5, [r1], #4
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ldmia r0, {r3,r4}
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mov r12,r5, lsl #16
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add r3, r3, r12,asr #17
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add r4, r4, r5, asr #17
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stmia r0!,{r3,r4}
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m16_32_no_unal2:
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tst r2, #1
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ldmeqfd sp!, {r4-r6,pc}
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ldrsh r4, [r1], #2
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ldr r3, [r0]
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add r3, r3, r4, asr #1
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str r3, [r0], #4
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ldmfd sp!, {r4-r6,lr}
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bx lr
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.global mix_16h_to_32_s1 @ int *dest, short *src, int count
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mix_16h_to_32_s1:
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stmfd sp!, {r4-r6,lr}
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subs r2, r2, #4
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bmi m16_32_s1_end
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m16_32_s1_loop:
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ldmia r0, {r3-r6}
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ldr r12,[r1], #8
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ldr lr, [r1], #8
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subs r2, r2, #4
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add r4, r4, r12,asr #17
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mov r12,r12,lsl #16
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add r3, r3, r12,asr #17 @ we use half volume
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add r6, r6, lr, asr #17
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mov lr, lr, lsl #16
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add r5, r5, lr, asr #17
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stmia r0!,{r3-r6}
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bpl m16_32_s1_loop
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m16_32_s1_end:
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tst r2, #2
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beq m16_32_s1_no_unal2
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ldr r5, [r1], #8
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ldmia r0, {r3,r4}
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mov r12,r5, lsl #16
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add r3, r3, r12,asr #17
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add r4, r4, r5, asr #17
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stmia r0!,{r3,r4}
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m16_32_s1_no_unal2:
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tst r2, #1
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ldmeqfd sp!, {r4-r6,pc}
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ldrsh r4, [r1], #2
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ldr r3, [r0]
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add r3, r3, r4, asr #1
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str r3, [r0], #4
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ldmfd sp!, {r4-r6,lr}
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bx lr
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.global mix_16h_to_32_s2 @ int *dest, short *src, int count
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mix_16h_to_32_s2:
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stmfd sp!, {r4-r6,lr}
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subs r2, r2, #4
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bmi m16_32_s2_end
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m16_32_s2_loop:
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ldmia r0, {r3-r6}
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ldr r12,[r1], #16
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ldr lr, [r1], #16
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subs r2, r2, #4
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add r4, r4, r12,asr #17
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mov r12,r12,lsl #16
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add r3, r3, r12,asr #17 @ we use half volume
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add r6, r6, lr, asr #17
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mov lr, lr, lsl #16
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add r5, r5, lr, asr #17
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stmia r0!,{r3-r6}
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bpl m16_32_s2_loop
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m16_32_s2_end:
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tst r2, #2
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beq m16_32_s2_no_unal2
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ldr r5, [r1], #16
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ldmia r0, {r3,r4}
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mov r12,r5, lsl #16
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add r3, r3, r12,asr #17
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add r4, r4, r5, asr #17
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stmia r0!,{r3,r4}
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m16_32_s2_no_unal2:
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tst r2, #1
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ldmeqfd sp!, {r4-r6,pc}
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ldrsh r4, [r1], #2
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ldr r3, [r0]
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add r3, r3, r4, asr #1
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str r3, [r0], #4
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ldmfd sp!, {r4-r6,lr}
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bx lr
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@ limit
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@ reg=int_sample, lr=1, r3=tmp, kills flags
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.macro Limit reg
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add r3, lr, \reg, asr #15
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bics r3, r3, #1 @ in non-overflow conditions r3 is 0 or 1
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movne \reg, #0x8000
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subpl \reg, \reg, #1
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.endm
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@ limit and shift up by 16
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@ reg=int_sample, lr=1, r3=tmp, kills flags
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.macro Limitsh reg
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@ movs r4, r3, asr #16
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@ cmnne r4, #1
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@ beq c32_16_no_overflow
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@ tst r4, r4
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@ mov r3, #0x8000
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@ subpl r3, r3, #1
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add r3, lr, \reg, asr #15
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bics r3, r3, #1 @ in non-overflow conditions r3 is 0 or 1
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moveq \reg, \reg, lsl #16
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movne \reg, #0x80000000
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subpl \reg, \reg, #0x00010000
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.endm
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@ mix 32bit audio (with 16bits really used, upper bits indicate overflow) with normal 16 bit audio with left channel only
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@ warning: this function assumes dest is word aligned
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.global mix_32_to_16l_stereo @ short *dest, int *src, int count
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mix_32_to_16l_stereo:
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stmfd sp!, {r4-r8,lr}
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mov lr, #1
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mov r2, r2, lsl #1
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subs r2, r2, #4
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bmi m32_16l_st_end
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m32_16l_st_loop:
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ldmia r0, {r8,r12}
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ldmia r1!, {r4-r7}
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mov r8, r8, lsl #16
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mov r12,r12,lsl #16
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add r4, r4, r8, asr #16
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add r5, r5, r8, asr #16
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add r6, r6, r12,asr #16
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add r7, r7, r12,asr #16
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Limitsh r4
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Limitsh r5
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Limitsh r6
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Limitsh r7
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subs r2, r2, #4
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orr r4, r5, r4, lsr #16
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orr r5, r7, r6, lsr #16
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stmia r0!, {r4,r5}
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bpl m32_16l_st_loop
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m32_16l_st_end:
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@ check for remaining bytes to convert
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tst r2, #2
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beq m32_16l_st_no_unal2
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ldrsh r6, [r0]
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ldmia r1!,{r4,r5}
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add r4, r4, r6
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add r5, r5, r6
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Limitsh r4
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Limitsh r5
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orr r4, r5, r4, lsr #16
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str r4, [r0], #4
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m32_16l_st_no_unal2:
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ldmfd sp!, {r4-r8,lr}
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bx lr
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@ mix 32bit audio (with 16bits really used, upper bits indicate overflow) with normal 16 bit audio (for mono sound)
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.global mix_32_to_16_mono @ short *dest, int *src, int count
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mix_32_to_16_mono:
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stmfd sp!, {r4-r8,lr}
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mov lr, #1
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@ check if dest is word aligned
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tst r0, #2
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beq m32_16_mo_no_unalw
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ldrsh r5, [r0]
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ldr r4, [r1], #4
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sub r2, r2, #1
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add r4, r4, r5
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Limit r4
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strh r4, [r0], #2
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m32_16_mo_no_unalw:
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subs r2, r2, #4
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bmi m32_16_mo_end
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m32_16_mo_loop:
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ldmia r0, {r8,r12}
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ldmia r1!, {r4-r7}
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add r5, r5, r8, asr #16
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mov r8, r8, lsl #16
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add r4, r4, r8, asr #16
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add r7, r7, r12,asr #16
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mov r12,r12,lsl #16
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add r6, r6, r12,asr #16
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Limitsh r4
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Limitsh r5
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Limitsh r6
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Limitsh r7
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subs r2, r2, #4
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orr r4, r5, r4, lsr #16
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orr r5, r7, r6, lsr #16
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stmia r0!, {r4,r5}
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bpl m32_16_mo_loop
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m32_16_mo_end:
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@ check for remaining bytes to convert
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tst r2, #2
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beq m32_16_mo_no_unal2
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ldr r6, [r0]
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ldmia r1!,{r4,r5}
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add r5, r5, r6, asr #16
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mov r6, r6, lsl #16
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add r4, r4, r6, asr #16
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Limitsh r4
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Limitsh r5
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orr r4, r5, r4, lsr #16
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str r4, [r0], #4
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m32_16_mo_no_unal2:
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tst r2, #1
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ldmeqfd sp!, {r4-r8,pc}
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ldrsh r5, [r0]
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ldr r4, [r1], #4
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add r4, r4, r5
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Limit r4
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strh r4, [r0], #2
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ldmfd sp!, {r4-r8,lr}
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bx lr
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