repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ba45a60 DM |
1 | /* |
| 2 | * Copyright (c) 2011 Mans Rullgard <mans@mansr.com> | |
| 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 "libavutil/arm/asm.S" | |
| 22 | ||
| 23 | function ff_ac3_bit_alloc_calc_bap_armv6, export=1 | |
| 24 | ldr r12, [sp] | |
| 25 | cmp r12, #-960 | |
| 26 | beq 4f | |
| 27 | push {r4-r11,lr} | |
| 28 | add r5, sp, #40 | |
| 29 | movrelx r4, X(ff_ac3_bin_to_band_tab), r11 | |
| 30 | movrelx lr, X(ff_ac3_band_start_tab) | |
| 31 | ldm r5, {r5-r7} | |
| 32 | ldrb r4, [r4, r2] | |
| 33 | add r1, r1, r2, lsl #1 @ psd + start | |
| 34 | add r0, r0, r4, lsl #1 @ mask + band | |
| 35 | add r4, r4, lr | |
| 36 | add r7, r7, r2 @ bap + start | |
| 37 | 1: | |
| 38 | ldrsh r9, [r0], #2 @ mask[band] | |
| 39 | mov r8, #0xff0 | |
| 40 | sub r9, r9, r12 @ - snr_offset | |
| 41 | ldrb r10, [r4, #1]! @ band_start_tab[++band] | |
| 42 | subs r9, r9, r5 @ - floor | |
| 43 | it lt | |
| 44 | movlt r9, #0 | |
| 45 | cmp r10, r3 @ - end | |
| 46 | and r9, r9, r8, lsl #1 @ & 0x1fe0 | |
| 47 | ite gt | |
| 48 | subgt r8, r3, r2 | |
| 49 | suble r8, r10, r2 | |
| 50 | mov r2, r10 | |
| 51 | add r9, r9, r5 @ + floor => m | |
| 52 | tst r8, #1 | |
| 53 | add r11, r7, r8 | |
| 54 | bne 3f | |
| 55 | b 5f | |
| 56 | 2: | |
| 57 | ldrsh r8, [r1], #2 | |
| 58 | ldrsh lr, [r1], #2 | |
| 59 | sub r8, r8, r9 | |
| 60 | sub lr, lr, r9 | |
| 61 | usat r8, #6, r8, asr #5 @ address | |
| 62 | usat lr, #6, lr, asr #5 | |
| 63 | ldrb r8, [r6, r8] @ bap_tab[address] | |
| 64 | ldrb lr, [r6, lr] | |
| 65 | strb r8, [r7], #1 @ bap[bin] | |
| 66 | strb lr, [r7], #1 | |
| 67 | 5: cmp r7, r11 | |
| 68 | blo 2b | |
| 69 | cmp r3, r10 | |
| 70 | bgt 1b | |
| 71 | pop {r4-r11,pc} | |
| 72 | 3: | |
| 73 | ldrsh r8, [r1], #2 @ psd[bin] | |
| 74 | sub r8, r8, r9 @ - m | |
| 75 | usat r8, #6, r8, asr #5 @ address | |
| 76 | ldrb r8, [r6, r8] @ bap_tab[address] | |
| 77 | strb r8, [r7], #1 @ bap[bin] | |
| 78 | b 5b | |
| 79 | 4: | |
| 80 | ldr r0, [sp, #12] | |
| 81 | mov r1, #0 | |
| 82 | mov r2, #256 | |
| 83 | b X(memset) | |
| 84 | endfunc |