Browse code
ac3enc: ARM optimised ac3_compute_matissa_size
Signed-off-by: Mans Rullgard <mans@mansr.com>
Mans Rullgard authored on 2011/03/12 02:25:45Showing 3 changed files
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+/* |
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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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+ |
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+#include "asm.S" |
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+ |
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+function ff_ac3_compute_mantissa_size_arm, export=1 |
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+ push {r4-r8,lr}
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+ ldm r0, {r4-r8}
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+ mov r3, r0 |
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+ mov r0, #0 |
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+1: |
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+ ldrb lr, [r1], #1 |
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+ subs r2, r2, #1 |
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+ blt 2f |
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+ cmp lr, #4 |
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+ bgt 3f |
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+ subs lr, lr, #1 |
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+ addlt r4, r4, #1 |
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+ addeq r5, r5, #1 |
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+ ble 1b |
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+ subs lr, lr, #2 |
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+ addlt r6, r6, #1 |
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+ addeq r7, r7, #1 |
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+ addgt r8, r8, #1 |
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+ b 1b |
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+3: |
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+ cmp lr, #14 |
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+ sublt lr, lr, #1 |
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+ addgt r0, r0, #16 |
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+ addle r0, r0, lr |
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+ b 1b |
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+2: |
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+ stm r3, {r4-r8}
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+ pop {r4-r8,pc}
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+endfunc |
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@@ -34,8 +34,12 @@ void ff_ac3_bit_alloc_calc_bap_armv6(int16_t *mask, int16_t *psd, |
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int snr_offset, int floor, |
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const uint8_t *bap_tab, uint8_t *bap); |
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+int ff_ac3_compute_mantissa_size_arm(int cnt[5], uint8_t *bap, int nb_coefs); |
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+ |
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av_cold void ff_ac3dsp_init_arm(AC3DSPContext *c, int bit_exact) |
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{
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+ c->compute_mantissa_size = ff_ac3_compute_mantissa_size_arm; |
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+ |
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if (HAVE_ARMV6) {
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c->bit_alloc_calc_bap = ff_ac3_bit_alloc_calc_bap_armv6; |
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} |