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ac3enc: ARM optimised ac3_compute_matissa_size 

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2011-03-11 17:25:45 +00:00
parent 182826c884
commit aa05f2126e
3 changed files with 59 additions and 1 deletions
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4
libavcodec/arm/Makefile
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@ -1,4 +1,6 @@
OBJS-$(CONFIG_AC3DSP) += arm/ac3dsp_init_arm.o
OBJS-$(CONFIG_AC3DSP) += arm/ac3dsp_init_arm.o \
arm/ac3dsp_arm.o
OBJS-$(CONFIG_DCA_DECODER) += arm/dcadsp_init_arm.o \
ARMV6-OBJS-$(CONFIG_AC3DSP) += arm/ac3dsp_armv6.o

52
libavcodec/arm/ac3dsp_arm.S Normal file
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@ -0,0 +1,52 @@
/*
* Copyright (c) 2011 Mans Rullgard <mans@mansr.com>
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "asm.S"
function ff_ac3_compute_mantissa_size_arm, export=1
push {r4-r8,lr}
ldm r0, {r4-r8}
mov r3, r0
mov r0, #0
1:
ldrb lr, [r1], #1
subs r2, r2, #1
blt 2f
cmp lr, #4
bgt 3f
subs lr, lr, #1
addlt r4, r4, #1
addeq r5, r5, #1
ble 1b
subs lr, lr, #2
addlt r6, r6, #1
addeq r7, r7, #1
addgt r8, r8, #1
b 1b
3:
cmp lr, #14
sublt lr, lr, #1
addgt r0, r0, #16
addle r0, r0, lr
b 1b
2:
stm r3, {r4-r8}
pop {r4-r8,pc}
endfunc

4
libavcodec/arm/ac3dsp_init_arm.c
View File

@ -34,8 +34,12 @@ void ff_ac3_bit_alloc_calc_bap_armv6(int16_t *mask, int16_t *psd,
int snr_offset, int floor,
const uint8_t *bap_tab, uint8_t *bap);
int ff_ac3_compute_mantissa_size_arm(int cnt[5], uint8_t *bap, int nb_coefs);
av_cold void ff_ac3dsp_init_arm(AC3DSPContext *c, int bit_exact)
{
c->compute_mantissa_size = ff_ac3_compute_mantissa_size_arm;
if (HAVE_ARMV6) {
c->bit_alloc_calc_bap = ff_ac3_bit_alloc_calc_bap_armv6;
}