repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ba45a60 DM |
1 | /* |
| 2 | * Copyright (c) 2008 Siarhei Siamashka <ssvb@users.sourceforge.net> | |
| 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 |