| /* |
| * 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 |
