mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
78 lines
2.7 KiB
78 lines
2.7 KiB
/* |
|
* Copyright (c) 2008 Siarhei Siamashka <ssvb@users.sourceforge.net> |
|
* |
|
* 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 "config.h" |
|
#include "asm.S" |
|
|
|
/** |
|
* ARM VFP optimized float to int16 conversion. |
|
* Assume that len is a positive number and is multiple of 8, destination |
|
* buffer is at least 4 bytes aligned (8 bytes alignment is better for |
|
* performance), little endian byte sex |
|
*/ |
|
@ void ff_float_to_int16_vfp(int16_t *dst, const float *src, int len) |
|
function ff_float_to_int16_vfp, export=1 |
|
push {r4-r8,lr} |
|
vpush {d8-d11} |
|
vldmia r1!, {s16-s23} |
|
vcvt.s32.f32 s0, s16 |
|
vcvt.s32.f32 s1, s17 |
|
vcvt.s32.f32 s2, s18 |
|
vcvt.s32.f32 s3, s19 |
|
vcvt.s32.f32 s4, s20 |
|
vcvt.s32.f32 s5, s21 |
|
vcvt.s32.f32 s6, s22 |
|
vcvt.s32.f32 s7, s23 |
|
1: |
|
subs r2, r2, #8 |
|
vmov r3, r4, s0, s1 |
|
vmov r5, r6, s2, s3 |
|
vmov r7, r8, s4, s5 |
|
vmov ip, lr, s6, s7 |
|
it gt |
|
vldmiagt r1!, {s16-s23} |
|
ssat r4, #16, r4 |
|
ssat r3, #16, r3 |
|
ssat r6, #16, r6 |
|
ssat r5, #16, r5 |
|
pkhbt r3, r3, r4, lsl #16 |
|
pkhbt r4, r5, r6, lsl #16 |
|
itttt gt |
|
vcvtgt.s32.f32 s0, s16 |
|
vcvtgt.s32.f32 s1, s17 |
|
vcvtgt.s32.f32 s2, s18 |
|
vcvtgt.s32.f32 s3, s19 |
|
itttt gt |
|
vcvtgt.s32.f32 s4, s20 |
|
vcvtgt.s32.f32 s5, s21 |
|
vcvtgt.s32.f32 s6, s22 |
|
vcvtgt.s32.f32 s7, s23 |
|
ssat r8, #16, r8 |
|
ssat r7, #16, r7 |
|
ssat lr, #16, lr |
|
ssat ip, #16, ip |
|
pkhbt r5, r7, r8, lsl #16 |
|
pkhbt r6, ip, lr, lsl #16 |
|
stmia r0!, {r3-r6} |
|
bgt 1b |
|
|
|
vpop {d8-d11} |
|
pop {r4-r8,pc} |
|
endfunc
|
|
|