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| /* | |
| * Copyright (c) 2011 Mans Rullgard <[email protected]> | |
| * | |
| * 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, =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 | |