Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Copyright (c) 2008 Siarhei Siamashka |
||
| 3 | * |
||
| 4 | * This file is part of FFmpeg. |
||
| 5 | * |
||
| 6 | * FFmpeg is free software; you can redistribute it and/or |
||
| 7 | * modify it under the terms of the GNU Lesser General Public |
||
| 8 | * License as published by the Free Software Foundation; either |
||
| 9 | * version 2.1 of the License, or (at your option) any later version. |
||
| 10 | * |
||
| 11 | * FFmpeg is distributed in the hope that it will be useful, |
||
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
||
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
||
| 14 | * Lesser General Public License for more details. |
||
| 15 | * |
||
| 16 | * You should have received a copy of the GNU Lesser General Public |
||
| 17 | * License along with FFmpeg; if not, write to the Free Software |
||
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
||
| 19 | */ |
||
| 20 | |||
| 21 | #include "config.h" |
||
| 22 | #include "libavutil/arm/asm.S" |
||
| 23 | |||
| 24 | /** |
||
| 25 | * ARM VFP optimized float to int16 conversion. |
||
| 26 | * Assume that len is a positive number and is multiple of 8, destination |
||
| 27 | * buffer is at least 4 bytes aligned (8 bytes alignment is better for |
||
| 28 | * performance), little-endian byte sex. |
||
| 29 | */ |
||
| 30 | @ void ff_float_to_int16_vfp(int16_t *dst, const float *src, int len) |
||
| 31 | function ff_float_to_int16_vfp, export=1 |
||
| 32 | push {r4-r8,lr} |
||
| 33 | vpush {d8-d11} |
||
| 34 | vldmia r1!, {s16-s23} |
||
| 35 | vcvt.s32.f32 s0, s16 |
||
| 36 | vcvt.s32.f32 s1, s17 |
||
| 37 | vcvt.s32.f32 s2, s18 |
||
| 38 | vcvt.s32.f32 s3, s19 |
||
| 39 | vcvt.s32.f32 s4, s20 |
||
| 40 | vcvt.s32.f32 s5, s21 |
||
| 41 | vcvt.s32.f32 s6, s22 |
||
| 42 | vcvt.s32.f32 s7, s23 |
||
| 43 | 1: |
||
| 44 | subs r2, r2, #8 |
||
| 45 | vmov r3, r4, s0, s1 |
||
| 46 | vmov r5, r6, s2, s3 |
||
| 47 | vmov r7, r8, s4, s5 |
||
| 48 | vmov ip, lr, s6, s7 |
||
| 49 | it gt |
||
| 50 | vldmiagt r1!, {s16-s23} |
||
| 51 | ssat r4, #16, r4 |
||
| 52 | ssat r3, #16, r3 |
||
| 53 | ssat r6, #16, r6 |
||
| 54 | ssat r5, #16, r5 |
||
| 55 | pkhbt r3, r3, r4, lsl #16 |
||
| 56 | pkhbt r4, r5, r6, lsl #16 |
||
| 57 | itttt gt |
||
| 58 | vcvtgt.s32.f32 s0, s16 |
||
| 59 | vcvtgt.s32.f32 s1, s17 |
||
| 60 | vcvtgt.s32.f32 s2, s18 |
||
| 61 | vcvtgt.s32.f32 s3, s19 |
||
| 62 | itttt gt |
||
| 63 | vcvtgt.s32.f32 s4, s20 |
||
| 64 | vcvtgt.s32.f32 s5, s21 |
||
| 65 | vcvtgt.s32.f32 s6, s22 |
||
| 66 | vcvtgt.s32.f32 s7, s23 |
||
| 67 | ssat r8, #16, r8 |
||
| 68 | ssat r7, #16, r7 |
||
| 69 | ssat lr, #16, lr |
||
| 70 | ssat ip, #16, ip |
||
| 71 | pkhbt r5, r7, r8, lsl #16 |
||
| 72 | pkhbt r6, ip, lr, lsl #16 |
||
| 73 | stmia r0!, {r3-r6} |
||
| 74 | bgt 1b |
||
| 75 | |||
| 76 | vpop {d8-d11} |
||
| 77 | pop {r4-r8,pc} |
||
| 78 | endfunc |