f244cbd5
 Hu Chunming
ffmpeg支持h264编码
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;*****************************************************************************
;* bitstream-a.asm: x86 bitstream functions
;*****************************************************************************
;* Copyright (C) 2010-2024 x264 project
;*
;* Authors: Fiona Glaser <fiona@x264.com>
;* Henrik Gramner <henrik@gramner.com>
;*
;* This program is free software; you can redistribute it and/or modify
;* it under the terms of the GNU General Public License as published by
;* the Free Software Foundation; either version 2 of the License, or
;* (at your option) any later version.
;*
;* This program 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 General Public License for more details.
;*
;* You should have received a copy of the GNU General Public License
;* along with this program; if not, write to the Free Software
;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
;*
;* This program is also available under a commercial proprietary license.
;* For more information, contact us at licensing@x264.com.
;*****************************************************************************
%include "x86inc.asm"
%include "x86util.asm"
SECTION .text
;-----------------------------------------------------------------------------
; uint8_t *x264_nal_escape( uint8_t *dst, uint8_t *src, uint8_t *end )
;-----------------------------------------------------------------------------
%macro NAL_LOOP 2
%%escape:
; Detect false positive to avoid unnecessary escape loop
xor r3d, r3d
cmp byte [r0+r1-1], 0
setnz r3b
xor k3, k4
jnz .escape
jmp %%continue
ALIGN 16
%1:
mova [r0+r1+mmsize], m1
pcmpeqb m1, m0
mova [r0+r1], m2
pcmpeqb m2, m0
pmovmskb r3d, m1
%2 m1, [r1+r2+3*mmsize]
pmovmskb r4d, m2
%2 m2, [r1+r2+2*mmsize]
shl k3, mmsize
or k3, k4
lea k4, [2*r3+1]
and k4, k3
jnz %%escape
%%continue:
add r1, 2*mmsize
jl %1
%endmacro
%macro NAL_ESCAPE 0
%if mmsize == 32
%xdefine k3 r3
%xdefine k4 r4
%else
%xdefine k3 r3d
%xdefine k4 r4d
%endif
cglobal nal_escape, 3,5
movzx r3d, byte [r1]
sub r1, r2 ; r1 = offset of current src pointer from end of src
pxor m0, m0
mov [r0], r3b
sub r0, r1 ; r0 = projected end of dst, assuming no more escapes
or r3d, 0xffffff00 ; ignore data before src
; Start off by jumping into the escape loop in case there's an escape at the start.
; And do a few more in scalar until dst is aligned.
jmp .escape_loop
%if mmsize == 16
NAL_LOOP .loop_aligned, mova
jmp .ret
%endif
NAL_LOOP .loop_unaligned, movu
.ret:
movifnidn rax, r0
RET
.escape:
; Skip bytes that are known to be valid
and k4, k3
tzcnt k4, k4
xor r3d, r3d ; the last two bytes are known to be zero
add r1, r4
.escape_loop:
inc r1
jge .ret
movzx r4d, byte [r1+r2]
shl r3d, 8
or r3d, r4d
test r3d, 0xfffffc ; if the last two bytes are 0 and the current byte is <=3
jz .add_escape_byte
.escaped:
lea r4d, [r0+r1]
mov [r0+r1], r3b
test r4d, mmsize-1 ; Do SIMD when dst is aligned
jnz .escape_loop
movu m1, [r1+r2+mmsize]
movu m2, [r1+r2]
%if mmsize == 16
lea r4d, [r1+r2]
test r4d, mmsize-1
jz .loop_aligned
%endif
jmp .loop_unaligned
.add_escape_byte:
mov byte [r0+r1], 3
inc r0
or r3d, 0x0300
jmp .escaped
%endmacro
INIT_MMX mmx2
NAL_ESCAPE
INIT_XMM sse2
NAL_ESCAPE
%if ARCH_X86_64
INIT_YMM avx2
NAL_ESCAPE
%endif
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