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 23function 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 371: 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 562: 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], #1 675: cmp r7, r11 68 blo 2b 69 cmp r3, r10 70 bgt 1b 71 pop {r4-r11,pc} 723: 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 794: 80 ldr r0, [sp, #12] 81 mov r1, #0 82 mov r2, #256 83 b X(memset) 84endfunc 85