PeerStreamer

;*****************************************************************************

;* x86-optimized AC-3 DSP utils

;* Copyright (c) 2011 Justin Ruggles

;*

;* This file is part of FFmpeg.

;*

;* FFmpeg 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.

;*

;* FFmpeg 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 FFmpeg; if not, write to the Free Software

;* 51, Inc., Foundation Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

;******************************************************************************

%include "x86inc.asm"

%include "x86util.asm"

SECTION .text

;-----------------------------------------------------------------------------

; void ff_ac3_exponent_min(uint8_t *exp, int num_reuse_blocks, int nb_coefs)

;-----------------------------------------------------------------------------

%macro AC3_EXPONENT_MIN 1

cglobal ac3_exponent_min_%1, 3,4,2, exp, reuse_blks, expn, offset

    shl  reuse_blksq, 8

    jz .end

    LOOP_ALIGN

.nextexp:

    mov      offsetq, reuse_blksq

    mova          m0, [expq+offsetq]

    sub      offsetq, 256

    LOOP_ALIGN

.nextblk:

    PMINUB        m0, [expq+offsetq], m1

    sub      offsetq, 256

    jae .nextblk

    mova      [expq], m0

    add         expq, mmsize

    sub        expnq, mmsize

    jg .nextexp

.end:

    REP_RET

%endmacro

%define PMINUB PMINUB_MMX

%define LOOP_ALIGN

INIT_MMX

AC3_EXPONENT_MIN mmx

%ifdef HAVE_MMX2

%define PMINUB PMINUB_MMXEXT

%define LOOP_ALIGN ALIGN 16

AC3_EXPONENT_MIN mmxext

%endif

%ifdef HAVE_SSE

INIT_XMM

AC3_EXPONENT_MIN sse2

%endif

%undef PMINUB

%undef LOOP_ALIGN

;-----------------------------------------------------------------------------

; int ff_ac3_max_msb_abs_int16(const int16_t *src, int len)

;

; This function uses 2 different methods to calculate a valid result.

; 1) logical 'or' of abs of each element

;        This is used for ssse3 because of the pabsw instruction.

;        It is also used for mmx because of the lack of min/max instructions.

; 2) calculate min/max for the array, then or(abs(min),abs(max))

;        This is used for mmxext and sse2 because they have pminsw/pmaxsw.

;-----------------------------------------------------------------------------

%macro AC3_MAX_MSB_ABS_INT16 2

cglobal ac3_max_msb_abs_int16_%1, 2,2,5, src, len

    pxor        m2, m2

    pxor        m3, m3

.loop:

%ifidn %2, min_max

    mova        m0, [srcq]

    mova        m1, [srcq+mmsize]

    pminsw      m2, m0

    pminsw      m2, m1

    pmaxsw      m3, m0

    pmaxsw      m3, m1

%else ; or_abs

%ifidn %1, mmx

    mova        m0, [srcq]

    mova        m1, [srcq+mmsize]

    ABS2        m0, m1, m3, m4

%else ; ssse3

    ; using memory args is faster for ssse3

    pabsw       m0, [srcq]

    pabsw       m1, [srcq+mmsize]

%endif

    por         m2, m0

    por         m2, m1

%endif

    add       srcq, mmsize*2

    sub       lend, mmsize

    ja .loop

%ifidn %2, min_max

    ABS2        m2, m3, m0, m1

    por         m2, m3

%endif

%ifidn mmsize, 16

    movhlps     m0, m2

    por         m2, m0

%endif

    PSHUFLW     m0, m2, 0xe

    por         m2, m0

    PSHUFLW     m0, m2, 0x1

    por         m2, m0

    movd       eax, m2

    and        eax, 0xFFFF

    RET

%endmacro

INIT_MMX

%define ABS2 ABS2_MMX

%define PSHUFLW pshufw

AC3_MAX_MSB_ABS_INT16 mmx, or_abs

%define ABS2 ABS2_MMX2

AC3_MAX_MSB_ABS_INT16 mmxext, min_max

INIT_XMM

%define PSHUFLW pshuflw

AC3_MAX_MSB_ABS_INT16 sse2, min_max

%define ABS2 ABS2_SSSE3

AC3_MAX_MSB_ABS_INT16 ssse3, or_abs