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ARM: ac3dsp: optimised update_bap_counts()

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Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2011-05-29 14:27:03 +01:00
parent bde2c1c7fe
commit 8e112df409
3 changed files with 39 additions and 1 deletions
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1
libavcodec/arm/Makefile
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@ -1,4 +1,5 @@
OBJS-$(CONFIG_AC3DSP) += arm/ac3dsp_init_arm.o \
arm/ac3dsp_arm.o
OBJS-$(CONFIG_DCA_DECODER) += arm/dcadsp_init_arm.o \

35
libavcodec/arm/ac3dsp_arm.S Normal file
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@ -0,0 +1,35 @@
/*
* 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_update_bap_counts_arm, export=1
push {lr}
ldrb lr, [r1], #1
1:
lsl r3, lr, #1
ldrh r12, [r0, r3]
subs r2, r2, #1
ldrbgt lr, [r1], #1
add r12, r12, #1
strh r12, [r0, r3]
bgt 1b
pop {pc}
endfunc

4
libavcodec/arm/ac3dsp_init_arm.c
View File

@ -35,10 +35,12 @@ 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);
void ff_ac3_update_bap_counts_arm(uint16_t mant_cnt[16], uint8_t *bap, int len);
av_cold void ff_ac3dsp_init_arm(AC3DSPContext *c, int bit_exact)
{
c->update_bap_counts = ff_ac3_update_bap_counts_arm;
if (HAVE_ARMV6) {
c->bit_alloc_calc_bap = ff_ac3_bit_alloc_calc_bap_armv6;
}