1/*
2 * Copyright (c) 2011 Mans Rullgard <mans@mansr.com>
3 *
4 * This file is part of Libav.
5 *
6 * Libav is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * Libav is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#include "asm.S"
22
23function ff_ac3_bit_alloc_calc_bap_armv6, export=1
24        ldr             r12, [sp]
25        cmp             r12, #-960
26        beq             4f
27        push            {r4-r11,lr}
28        add             r5,  sp,  #40
29        movrel          r4,  X(ff_ac3_bin_to_band_tab)
30        movrel          lr,  X(ff_ac3_band_start_tab)
31        ldm             r5,  {r5-r7}
32        ldrb            r4,  [r4, r2]
33        add             r1,  r1,  r2,  lsl #1           @ psd + start
34        add             r0,  r0,  r4,  lsl #1           @ mask + band
35        add             r4,  lr,  r4
36        add             r7,  r7,  r2                    @ bap + start
37        ldrb            r10, [r4], #1
381:
39        ldrsh           r9,  [r0], #2                   @ mask[band]
40        mov             r8,  #0xff0
41        sub             r9,  r9,  r12                   @   - snr_offset
42        mov             r11, r10
43        ldrb            r10, [r4], #1                   @ band_start_tab[band++]
44        subs            r9,  r9,  r5                    @   - floor
45        it              lt
46        movlt           r9,  #0
47        cmp             r10, r3                         @   - end
48        and             r9,  r9,  r8, lsl #1            @   & 0x1fe0
49        ite             gt
50        subgt           r8,  r3,  r11
51        suble           r8,  r10, r11
52        add             r9,  r9,  r5                    @   + floor => m
53        tst             r8,  #1
54        add             r2,  r7,  r8
55        bne             3f
56        b               5f
572:
58        ldrsh           r8,  [r1], #2
59        ldrsh           lr,  [r1], #2
60        sub             r8,  r8,  r9
61        sub             lr,  lr,  r9
62        usat            r8,  #6,  r8,  asr #5           @ address
63        usat            lr,  #6,  lr,  asr #5
64        ldrb            r8,  [r6, r8]                   @ bap_tab[address]
65        ldrb            lr,  [r6, lr]
66        strb            r8,  [r7], #1                   @ bap[bin]
67        strb            lr,  [r7], #1
685:      cmp             r7,  r2
69        blo             2b
70        cmp             r3,  r11
71        bgt             1b
72        pop             {r4-r11,pc}
733:
74        ldrsh           r8,  [r1], #2                   @ psd[bin]
75        sub             r8,  r8,  r9                    @   - m
76        usat            r8,  #6,  r8,  asr #5           @ address
77        ldrb            r8,  [r6, r8]                   @ bap_tab[address]
78        strb            r8,  [r7], #1                   @ bap[bin]
79        b               5b
804:
81        ldr             r0,  [sp, #12]
82        mov             r1,  #0
83        mov             r2,  #256
84        b               X(memset)
85endfunc
86