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ac3enc: ARM optimised ac3_compute_matissa_size
Signed-off-by: Mans Rullgard <mans@mansr.com>
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@ -1,4 +1,6 @@
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OBJS-$(CONFIG_AC3DSP) += arm/ac3dsp_init_arm.o
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OBJS-$(CONFIG_AC3DSP) += arm/ac3dsp_init_arm.o \
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arm/ac3dsp_arm.o
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OBJS-$(CONFIG_DCA_DECODER) += arm/dcadsp_init_arm.o \
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ARMV6-OBJS-$(CONFIG_AC3DSP) += arm/ac3dsp_armv6.o
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52
libavcodec/arm/ac3dsp_arm.S
Normal file
52
libavcodec/arm/ac3dsp_arm.S
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@ -0,0 +1,52 @@
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/*
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* Copyright (c) 2011 Mans Rullgard <mans@mansr.com>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "asm.S"
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function ff_ac3_compute_mantissa_size_arm, export=1
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push {r4-r8,lr}
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ldm r0, {r4-r8}
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mov r3, r0
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mov r0, #0
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1:
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ldrb lr, [r1], #1
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subs r2, r2, #1
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blt 2f
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cmp lr, #4
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bgt 3f
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subs lr, lr, #1
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addlt r4, r4, #1
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addeq r5, r5, #1
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ble 1b
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subs lr, lr, #2
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addlt r6, r6, #1
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addeq r7, r7, #1
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addgt r8, r8, #1
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b 1b
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3:
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cmp lr, #14
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sublt lr, lr, #1
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addgt r0, r0, #16
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addle r0, r0, lr
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b 1b
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2:
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stm r3, {r4-r8}
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pop {r4-r8,pc}
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endfunc
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@ -34,8 +34,12 @@ void ff_ac3_bit_alloc_calc_bap_armv6(int16_t *mask, int16_t *psd,
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int snr_offset, int floor,
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const uint8_t *bap_tab, uint8_t *bap);
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int ff_ac3_compute_mantissa_size_arm(int cnt[5], uint8_t *bap, int nb_coefs);
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av_cold void ff_ac3dsp_init_arm(AC3DSPContext *c, int bit_exact)
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{
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c->compute_mantissa_size = ff_ac3_compute_mantissa_size_arm;
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if (HAVE_ARMV6) {
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c->bit_alloc_calc_bap = ff_ac3_bit_alloc_calc_bap_armv6;
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}
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