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84 lines
3.4 KiB
84 lines
3.4 KiB
/* |
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* Copyright (c) 2011 Mans Rullgard <mans@mansr.com> |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/arm/asm.S" |
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function ff_ac3_bit_alloc_calc_bap_armv6, export=1 |
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ldr r12, [sp] |
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cmp r12, #-960 |
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beq 4f |
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push {r4-r11,lr} |
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add r5, sp, #40 |
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movrelx r4, X(ff_ac3_bin_to_band_tab), r11 |
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movrelx lr, X(ff_ac3_band_start_tab) |
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ldm r5, {r5-r7} |
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ldrb r4, [r4, r2] |
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add r1, r1, r2, lsl #1 @ psd + start |
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add r0, r0, r4, lsl #1 @ mask + band |
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add r4, lr, r4 |
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add r7, r7, r2 @ bap + start |
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1: |
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ldrsh r9, [r0], #2 @ mask[band] |
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mov r8, #0xff0 |
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sub r9, r9, r12 @ - snr_offset |
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ldrb r10, [r4, #1]! @ band_start_tab[++band] |
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subs r9, r9, r5 @ - floor |
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it lt |
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movlt r9, #0 |
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cmp r10, r3 @ - end |
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and r9, r9, r8, lsl #1 @ & 0x1fe0 |
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ite gt |
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subgt r8, r3, r2 |
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suble r8, r10, r2 |
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mov r2, r10 |
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add r9, r9, r5 @ + floor => m |
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tst r8, #1 |
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add r11, r7, r8 |
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bne 3f |
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b 5f |
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2: |
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ldrsh r8, [r1], #2 |
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ldrsh lr, [r1], #2 |
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sub r8, r8, r9 |
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sub lr, lr, r9 |
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usat r8, #6, r8, asr #5 @ address |
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usat lr, #6, lr, asr #5 |
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ldrb r8, [r6, r8] @ bap_tab[address] |
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ldrb lr, [r6, lr] |
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strb r8, [r7], #1 @ bap[bin] |
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strb lr, [r7], #1 |
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5: cmp r7, r11 |
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blo 2b |
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cmp r3, r10 |
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bgt 1b |
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pop {r4-r11,pc} |
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3: |
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ldrsh r8, [r1], #2 @ psd[bin] |
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sub r8, r8, r9 @ - m |
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usat r8, #6, r8, asr #5 @ address |
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ldrb r8, [r6, r8] @ bap_tab[address] |
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strb r8, [r7], #1 @ bap[bin] |
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b 5b |
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4: |
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ldr r0, [sp, #12] |
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mov r1, #0 |
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mov r2, #256 |
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b X(memset) |
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endfunc
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