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cbp_mmx.asm
资源名称：NETVIDEO.rar [点击查看]
上传用户：sun1608
上传日期：2007-02-02
资源大小：6116k
文件大小：4k
源码类别：
流媒体/Mpeg4/MP4
开发平台：
Visual C++
- ;/**************************************************************************
- ; *
- ; * XVID MPEG-4 VIDEO CODEC
- ; * mmx cbp calc
- ; *
- ; * This program is an implementation of a part of one or more MPEG-4
- ; * Video tools as specified in ISO/IEC 14496-2 standard. Those intending
- ; * to use this software module in hardware or software products are
- ; * advised that its use may infringe existing patents or copyrights, and
- ; * any such use would be at such party's own risk. The original
- ; * developer of this software module and his/her company, and subsequent
- ; * editors and their companies, will have no liability for use of this
- ; * software or modifications or derivatives thereof.
- ; *
- ; * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
- ; *
- ; *************************************************************************/
- ;/**************************************************************************
- ; *
- ; * History:
- ; *
- ; * 22.03.2002 0.01 ; Min Chen <chenm001@163.com>
- ; * ; use 386 cpu's 'BTS' to replace 'cbp |= 1 << (edx-1)'
- ; * 24.11.2001 inital version; (c)2001 peter ross <pross@cs.rmit.edu.au>
- ; *
- ; *************************************************************************/
- bits 32
- section .data
- %macro cglobal 1
- %ifdef PREFIX
- global _%1
- %define %1 _%1
- %else
- global %1
- %endif
- %endmacro
- ignore_dc dw 0, -1, -1, -1
- section .text
- ;===========================================================================
- ;
- ; uint32_t calc_cbp_mmx(const int16_t coeff[6][64]);
- ;
- ;===========================================================================
- align 16
- cglobal calc_cbp_mmx
- calc_cbp_mmx
- push ebx
- push ecx
- push edx
- push esi
- mov esi, [esp + 16 + 4] ; coeff
- movq mm7, [ignore_dc]
- xor eax, eax ; cbp = 0
- mov edx, 6
- .loop
- movq mm0, [esi]
- pand mm0, mm7
- movq mm1, [esi+8]
- por mm0, [esi+16]
- por mm1, [esi+24]
- por mm0, [esi+32]
- por mm1, [esi+40]
- por mm0, [esi+48]
- por mm1, [esi+56]
- por mm0, [esi+64]
- por mm1, [esi+72]
- por mm0, [esi+80]
- por mm1, [esi+88]
- por mm0, [esi+96]
- por mm1, [esi+104]
- por mm0, [esi+112]
- por mm1, [esi+120]
- por mm0, mm1
- movq mm1, mm0
- psrlq mm1, 32
- por mm0, mm1
- movd ebx, mm0
- add esi, 128
- or ebx, ebx
- jz .iterate
- ; cbp |= 1 << (edx-1)
- ; Change by Chenm001 <chenm001@163.com>
- ;mov ecx, edx
- ;dec ecx
- ;mov ebx, 1
- ;shl ebx, cl
- ;or eax, ebx
- lea ebx,[edx-1]
- bts eax,ebx
- .iterate dec edx
- jnz .loop
- pop esi
- pop edx
- pop ecx
- pop ebx
- ret
