/* * Copyright (c) 2011 Mans Rullgard <mans@mansr.com> * * This file is part of FFmpeg. * * FFmpeg 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. * * FFmpeg 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 FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/arm/asm.S" function ff_ac3_bit_alloc_calc_bap_armv6, export=1 ldr r12, [sp] cmp r12, #-960 beq 4f push {r4-r11,lr} add r5, sp, #40 movrelx r4, X(ff_ac3_bin_to_band_tab), r11 movrelx lr, X(ff_ac3_band_start_tab) ldm r5, {r5-r7} ldrb r4, [r4, r2] add r1, r1, r2, lsl #1 @ psd + start add r0, r0, r4, lsl #1 @ mask + band add r4, r4, lr add r7, r7, r2 @ bap + start 1: ldrsh r9, [r0], #2 @ mask[band] mov r8, #0xff0 sub r9, r9, r12 @ - snr_offset ldrb r10, [r4, #1]! @ band_start_tab[++band] subs r9, r9, r5 @ - floor it lt movlt r9, #0 cmp r10, r3 @ - end and r9, r9, r8, lsl #1 @ & 0x1fe0 ite gt subgt r8, r3, r2 suble r8, r10, r2 mov r2, r10 add r9, r9, r5 @ + floor => m tst r8, #1 add r11, r7, r8 bne 3f b 5f 2: ldrsh r8, [r1], #2 ldrsh lr, [r1], #2 sub r8, r8, r9 sub lr, lr, r9 usat r8, #6, r8, asr #5 @ address usat lr, #6, lr, asr #5 ldrb r8, [r6, r8] @ bap_tab[address] ldrb lr, [r6, lr] strb r8, [r7], #1 @ bap[bin] strb lr, [r7], #1 5: cmp r7, r11 blo 2b cmp r3, r10 bgt 1b pop {r4-r11,pc} 3: ldrsh r8, [r1], #2 @ psd[bin] sub r8, r8, r9 @ - m usat r8, #6, r8, asr #5 @ address ldrb r8, [r6, r8] @ bap_tab[address] strb r8, [r7], #1 @ bap[bin] b 5b 4: ldr r0, [sp, #12] mov r1, #0 mov r2, #256 b X(memset) endfunc