PeerStreamer

ARMV6-OBJS-$(CONFIG_AC3DSP)            += arm/ac3dsp_armv6.o

/*

 * 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

void ff_ac3_bit_alloc_calc_bap_armv6(int16_t *mask, int16_t *psd,

                                     int start, int end,

                                     int snr_offset, int floor,

                                     const uint8_t *bap_tab, uint8_t *bap);

    if (HAVE_ARMV6) {

        c->bit_alloc_calc_bap    = ff_ac3_bit_alloc_calc_bap_armv6;

    }