y2touy.asm

linux下的一款播放器

;
; ***** BEGIN LICENSE BLOCK *****
; Source last modified: $Id: y2touy.asm,v 1.1.1.1.50.1 2004/07/09 02:00:18 hubbe Exp $
; 
; Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
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;

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;  YUY2 to UYVY MMX converter.
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

%ifdef   COFF
        %define YUY2ToUYVY_MMX _YUY2ToUYVY_MMX
%elifdef WIN32
        %define YUY2ToUYVY_MMX _YUY2ToUYVY_MMX
%elifdef ELF
        %define YUY2ToUYVY_MMX YUY2ToUYVY_MMX
%elifdef AOUTB
        %define YUY2ToUYVY_MMX YUY2ToUYVY_MMX
%else
        %error linking format currently not supported by alphbablend.asm
%endif

        ;; Export the functions implemented here.
        global YUY2ToUYVY_MMX

;========================= DATA SEGMENT ============================
section .data
align 8        

;============================= CODE SEGMENT =======================                        
section .text


;;
;; This is our stack params definition. It is used for both
;; YUY2 and UYVY routines as they both take the same parms.
;;                                        
%assign numtemps 4
%define var(a) [esp+a]       
                
struc parms
        ;Temps on stack
        .tmp1       resd 1  ;General DWORD temp.
        .tmp2       resd 1  ;General DWORD temp.
        .tmp3       resd 1  ;General DWORD temp.
        .tmp4       resd 1  ;General DWORD temp.
        
        ; Space for reg pushes and return address.
        .registers  resd 6  ;pushed registers
        .return     resd 1  ;return address

        ; input params
        .src:       resd 1  ;unsigned char*,      
        .dest:      resd 1  ;unsigned char*,      
        .dx:        resd 1  ;ULONG32,      

endstruc


YUY2ToUYVY_MMX:
        ;; Save some stuff...
        push ebx
        push edi
        push esi
        push ebp
        push ecx
        push edx

        ; Make room for temps on stack
        sub esp, numtemps*4;

        ;; Grab source and dest pointers...
        mov esi, var(parms.src)
        mov edi, var(parms.dest)

        ;; Preload our address add constant
        mov edx, 8
     
        mov ecx, var(parms.dx)
        shr ecx, 3              ; we do 4 macro pixels at a time.
        jnc loop1               ; Do we have a width that is a multiple of 8?
        ;; We have 2 macro pixels left over. Do them here
        
        movq  mm0, [esi]        ; grab 2 macro pixels from source
        movq  mm1, mm0          ; mm1=mm0= VVYYUUYY VVYYUUYY 
        psllw mm1, 8            ; mm1 = YY00YY00 YY00YY00
        psrlw mm0, 8            ; mm0 = 00VV00UU 00VV00UU
        por   mm0, mm1          ; mm0 = YYVVYYUU YYVVYYUU
        movq  [edi], mm0        ; store it.
        add   esi, edx
        add   edi, edx

        ;; This loops does 16 bytes at a time (4 macro pixels).
loop1:   
        movq  mm0, [esi]        ; grab 2 macro pixels from source
        add esi, edx

        movq  mm1, mm0          ; mm1=mm0= VVYYUUYY VVYYUUYY 
        psllw mm1, 8            ; mm1 = YY00YY00 YY00YY00
        psrlw mm0, 8            ; mm0 = 00VV00UU 00VV00UU
        movq  mm2, [esi]        ; grab 2 macro pixels from source

        por   mm0, mm1          ; mm0 = YYVVYYUU YYVVYYUU
        movq  mm3, mm2          ; mm1=mm0= VVYYUUYY VVYYUUYY 
        
        movq  [edi], mm0        ; store it.

        add edi, edx
        psllw mm3, 8            ; mm1 = YY00YY00 YY00YY00

        psrlw mm2, 8            ; mm0 = 00VV00UU 00VV00UU
        por   mm2, mm3          ; mm0 = YYVVYYUU YYVVYYUU
        add esi, edx
        
        movq  [edi], mm2        ; store it.
                
        ;; Now do the loop calcs....
        add edi, edx
        dec ecx
        jnz loop1
        
end: 
        ;; Free up stack temp var.
        add esp, numtemps*4
        
        ;; Pop off the stack....
        pop edx
        pop ecx
        pop ebp
        pop esi
        pop edi
        pop ebx
        ;; This emms is expensive. If we don't do it we wipe out the
        ;; floating ponts registers but that should be ok.
;         emms 
        
        ;; success
        xor eax, eax
        ret

;;; leave a trace
version: db '$(gfw) Copyright 2001 RealNetworks Inc. Revision:1.0 $',0