diff options
| author | Mans Rullgard <mans@mansr.com> | 2011-03-11 02:50:57 +0000 |
|---|---|---|
| committer | Mans Rullgard <mans@mansr.com> | 2011-04-01 22:46:05 +0100 |
| commit | 182826c8846f2f7f0538c4b2a09e882e29881804 (patch) | |
| tree | 7d57981dbab0d12887f63d164edaaa9c563a5db0 /libavcodec/arm/ac3dsp_armv6.S | |
| parent | 5085a1a068d85cf68501d8efe09acfbd42ff3860 (diff) | |
ac3: armv6 optimised bit_alloc_calc_bap
Signed-off-by: Mans Rullgard <mans@mansr.com>
Diffstat (limited to 'libavcodec/arm/ac3dsp_armv6.S')
| -rw-r--r-- | libavcodec/arm/ac3dsp_armv6.S | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/libavcodec/arm/ac3dsp_armv6.S b/libavcodec/arm/ac3dsp_armv6.S new file mode 100644 index 0000000000..7f01addbde --- /dev/null +++ b/libavcodec/arm/ac3dsp_armv6.S @@ -0,0 +1,83 @@ +/* + * Copyright (c) 2011 Mans Rullgard <mans@mansr.com> + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "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 + movrel r4, X(ff_ac3_bin_to_band_tab) + movrel 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, lr, r4 + add r7, r7, r2 @ bap + start + ldrb r10, [r4], #1 +1: + ldrsh r9, [r0], #2 @ mask[band] + movw r8, #0x1fe0 + sub r9, r9, r12 @ - snr_offset + mov r11, r10 + ldrb r10, [r4], #1 @ band_start_tab[band++] + subs r9, r9, r5 @ - floor + movlt r9, #0 + cmp r10, r3 @ - end + and r9, r9, r8 @ & 0x1fe0 + subgt r8, r3, r11 + suble r8, r10, r11 + add r9, r9, r5 @ + floor => m + tst r8, #1 + add r2, 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, r2 + blo 2b + cmp r3, r11 + 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 memset +endfunc |