forked from len0rd/rockbox
91bdc3ea90
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25717 a1c6a512-1295-4272-9138-f99709370657
127 lines
5.8 KiB
ArmAsm
127 lines
5.8 KiB
ArmAsm
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2010 Michael Sevakis
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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/****************************************************************************
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* void sample_output_mono(int count, struct dsp_data *data,
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* const int32_t *src[], int16_t *dst)
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*/
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.section .text, "ax", %progbits
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.align 2
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.global sample_output_mono
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.type sample_output_mono, %function
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sample_output_mono:
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@ input: r0 = count, r1 = data, r2 = src, r3 = dst
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stmfd sp!, { r4, lr } @
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@
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ldr r1, [r1] @ r1 = data->output_scale
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ldr r2, [r2] @ r2 = src[0]
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@
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mov r4, #1 @ r4 = 1 << (scale - 1)
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mov r4, r4, lsl r1 @
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subs r0, r0, #1 @ odd: end at 0; even: end at -1
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mov r4, r4, lsr #1 @
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beq 2f @ Zero? Only one sample!
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@
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1: @
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ldmia r2!, { r12, r14 } @ load Mi0, Mi1
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qadd r12, r12, r4 @ round, scale, saturate and
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qadd r14, r14, r4 @ pack Mi0 to So0, Mi1 to So1
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mov r12, r12, asr r1 @
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mov r14, r14, asr r1 @
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ssat r12, #16, r12 @
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ssat r14, #16, r14 @
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pkhbt r12, r12, r12, asl #16 @
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pkhbt r14, r14, r14, asl #16 @
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subs r0, r0, #2 @
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stmia r3!, { r12, r14 } @ store So0, So1
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bgt 1b @
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@
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ldmltfd sp!, { r4, pc } @ if count was even, we're done
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@
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2: @
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ldr r12, [r2] @ round, scale, saturate
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qadd r12, r12, r4 @ and pack Mi to So
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mov r12, r12, asr r1 @
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ssat r12, #16, r12 @
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pkhbt r12, r12, r12, asl #16 @
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str r12, [r3] @ store So
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@
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ldmfd sp!, { r4, pc } @
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.size sample_output_mono, .-sample_output_mono
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/****************************************************************************
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* void sample_output_stereo(int count, struct dsp_data *data,
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* const int32_t *src[], int16_t *dst)
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*/
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.section .text, "ax", %progbits
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.align 2
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.global sample_output_stereo
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.type sample_output_stereo, %function
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sample_output_stereo:
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@ input: r0 = count, r1 = data, r2 = src, r3 = dst
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stmfd sp!, { r4-r7, lr } @
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@
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ldr r1, [r1] @ r1 = data->output_scale
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ldmia r2, { r2, r4 } @ r2 = src[0], r4 = src[1]
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@
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mov r5, #1 @ r5 = 1 << (scale - 1)
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mov r5, r5, lsl r1 @
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subs r0, r0, #1 @ odd: end at 0; even: end at -1
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mov r5, r5, lsr #1 @
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beq 2f @ Zero? Only one sample!
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@
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1: @
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ldmia r2!, { r6, r7 } @ r6, r7 = Li0, Li1
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ldmia r4!, { r12, r14 } @ r12, r14 = Ri0, Ri1
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qadd r6, r6, r5 @ round, scale, saturate and pack
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qadd r7, r7, r5 @ Li0+Ri0 to So0, Li1+Ri1 to So1
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qadd r12, r12, r5 @
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qadd r14, r14, r5 @
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mov r6, r6, asr r1 @
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mov r7, r7, asr r1 @
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mov r12, r12, asr r1 @
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mov r14, r14, asr r1 @
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ssat r6, #16, r6 @
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ssat r12, #16, r12 @
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ssat r7, #16, r7 @
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ssat r14, #16, r14 @
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pkhbt r6, r6, r12, asl #16 @
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pkhbt r7, r7, r14, asl #16 @
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subs r0, r0, #2 @
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stmia r3!, { r6, r7 } @ store So0, So1
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bgt 1b @
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@
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ldmltfd sp!, { r4-r7, pc } @ if count was even, we're done
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@
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2: @
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ldr r6, [r2] @ r6 = Li
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ldr r12, [r4] @ r12 = Ri
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qadd r6, r6, r5 @ round, scale, saturate
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qadd r12, r12, r5 @ and pack Li+Ri to So
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mov r6, r6, asr r1 @
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mov r12, r12, asr r1 @
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ssat r6, #16, r6 @
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ssat r12, #16, r12 @
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pkhbt r6, r6, r12, asl #16 @
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str r6, [r3] @ store So
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@
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ldmfd sp!, { r4-r7, pc } @
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.size sample_output_stereo, .-sample_output_stereo
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