/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * * Copyright (C) 2010 Michael Sevakis * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ****************************************************************************/ #include "rbcodecconfig.h" .syntax unified /**************************************************************************** * void sample_output_mono(struct sample_io_data *this, * struct dsp_buffer *src, * struct dsp_buffer *dst) */ .section .text .global sample_output_mono .type sample_output_mono, %function sample_output_mono: @ input: r0 = this, r1 = src, r2 = dst stmfd sp!, { r4, lr } @ @ ldr r0, [r0] @ r0 = this->outcount ldr r3, [r2, #4] @ r3 = dst->p16out ldr r2, [r1, #4] @ r2 = src->p32[0] ldrb r1, [r1, #19] @ r1 = src->format.output_scale @ mov r4, #1 @ r4 = 1 << (scale - 1) mov r4, r4, lsl r1 @ subs r0, r0, #1 @ odd: end at 0; even: end at -1 mov r4, r4, lsr #1 @ beq 2f @ Zero? Only one sample! @ 1: @ ldmia r2!, { r12, r14 } @ load Mi0, Mi1 qadd r12, r12, r4 @ round, scale, saturate and qadd r14, r14, r4 @ pack Mi0 to So0, Mi1 to So1 mov r12, r12, asr r1 @ mov r14, r14, asr r1 @ ssat r12, #16, r12 @ ssat r14, #16, r14 @ pkhbt r12, r12, r12, asl #16 @ pkhbt r14, r14, r14, asl #16 @ subs r0, r0, #2 @ stmia r3!, { r12, r14 } @ store So0, So1 bgt 1b @ @ ldmfdlt sp!, { r4, pc } @ if count was even, we're done @ 2: @ ldr r12, [r2] @ round, scale, saturate qadd r12, r12, r4 @ and pack Mi to So mov r12, r12, asr r1 @ ssat r12, #16, r12 @ pkhbt r12, r12, r12, asl #16 @ str r12, [r3] @ store So @ ldmfd sp!, { r4, pc } @ .size sample_output_mono, .-sample_output_mono #ifndef CPU_ARM_MICRO /**************************************************************************** * void sample_output_stereo(struct sample_io_data *this, * struct dsp_buffer *src, * struct dsp_buffer *dst) */ .section .text .global sample_output_stereo .type sample_output_stereo, %function sample_output_stereo: @ input: r0 = this, r1 = src, r2 = dst stmfd sp!, { r4-r7, lr } @ @ ldr r0, [r0] @ r0 = this->outcount ldr r3, [r2, #4] @ r3 = dst->p16out ldmib r1, { r2, r4 } @ r2 = src->p32[0], r4 = src->p32[1] ldrb r1, [r1, #19] @ r1 = src->format.output_scale @ mov r5, #1 @ r5 = 1 << (scale - 1) mov r5, r5, lsl r1 @ subs r0, r0, #1 @ odd: end at 0; even: end at -1 mov r5, r5, lsr #1 @ beq 2f @ Zero? Only one sample! @ 1: @ ldmia r2!, { r6, r7 } @ r6, r7 = Li0, Li1 ldmia r4!, { r12, r14 } @ r12, r14 = Ri0, Ri1 qadd r6, r6, r5 @ round, scale, saturate and pack qadd r7, r7, r5 @ Li0+Ri0 to So0, Li1+Ri1 to So1 qadd r12, r12, r5 @ qadd r14, r14, r5 @ mov r6, r6, asr r1 @ mov r7, r7, asr r1 @ mov r12, r12, asr r1 @ mov r14, r14, asr r1 @ ssat r6, #16, r6 @ ssat r12, #16, r12 @ ssat r7, #16, r7 @ ssat r14, #16, r14 @ pkhbt r6, r6, r12, asl #16 @ pkhbt r7, r7, r14, asl #16 @ subs r0, r0, #2 @ stmia r3!, { r6, r7 } @ store So0, So1 bgt 1b @ @ ldmfdlt sp!, { r4-r7, pc } @ if count was even, we're done @ 2: @ ldr r6, [r2] @ r6 = Li ldr r12, [r4] @ r12 = Ri qadd r6, r6, r5 @ round, scale, saturate qadd r12, r12, r5 @ and pack Li+Ri to So mov r6, r6, asr r1 @ mov r12, r12, asr r1 @ ssat r6, #16, r6 @ ssat r12, #16, r12 @ pkhbt r6, r6, r12, asl #16 @ str r6, [r3] @ store So @ ldmfd sp!, { r4-r7, pc } @ .size sample_output_stereo, .-sample_output_stereo #endif /* CPU_ARM_MICRO */