f244cbd5
 Hu Chunming
ffmpeg支持h264编码
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/*****************************************************************************
* bitstream-a.S: arm bitstream functions
*****************************************************************************
* Copyright (C) 2014-2024 x264 project
*
* Authors: Janne Grunau <janne-x264@jannau.net>
*
* 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 "asm.S"
function nal_escape_neon
push {r4-r5,lr}
vmov.u8 q0, #0xff
vmov.u8 q8, #4
mov r3, #3
subs lr, r1, r2
beq 99f
0:
cmn lr, #15
blt 16f
mov r1, r2
b 100f
16:
vld1.8 {q1}, [r1]!
vext.8 q2, q0, q1, #14
vext.8 q3, q0, q1, #15
vcgt.u8 q11, q8, q1
vceq.u8 q9, q2, #0
vceq.u8 q10, q3, #0
vand q9, q9, q11
vand q9, q9, q10
vshrn.u16 d22, q9, #4
vmov ip, lr, d22
orrs ip, ip, lr
beq 16f
mov lr, #-16
100:
vmov.u8 r5, d1[6]
vmov.u8 r4, d1[7]
orr r5, r4, r5, lsl #8
101:
ldrb r4, [r1, lr]
orr ip, r4, r5, lsl #16
cmp ip, #3
bhi 102f
strb r3, [r0], #1
orr r5, r3, r5, lsl #8
102:
adds lr, lr, #1
strb r4, [r0], #1
orr r5, r4, r5, lsl #8
blt 101b
subs lr, r1, r2
lsr ip, r5, #8
vmov.u8 d1[6], ip
vmov.u8 d1[7], r5
blt 0b
pop {r4-r5,pc}
16:
subs lr, r1, r2
vst1.8 {q1}, [r0]!
vmov q0, q1
blt 0b
99:
pop {r4-r5,pc}
endfunc
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