@/*****************************************************************************
@*
@* Copyright (C) 2012 Ittiam Systems Pvt Ltd, Bangalore
@*
@* Licensed under the Apache License, Version 2.0 (the "License");
@* you may not use this file except in compliance with the License.
@* You may obtain a copy of the License at:
@*
@* http://www.apache.org/licenses/LICENSE-2.0
@*
@* Unless required by applicable law or agreed to in writing, software
@* distributed under the License is distributed on an "AS IS" BASIS,
@* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@* See the License for the specific language governing permissions and
@* limitations under the License.
@*
@*****************************************************************************/
@/**
@/*******************************************************************************
@* @file
@* ihevcd_fmt_conv_420sp_to_420sp.s
@*
@* @brief
@* contains function definitions for format conversions
@*
@* @author
@* ittiam
@*
@* @par list of functions:
@*
@*
@* @remarks
@* none
@*
@*******************************************************************************/
.equ DO1STROUNDING, 0
@ ARM
@
@ PRESERVE8
.text
.p2align 2
@/*****************************************************************************
@* *
@* Function Name : ihevcd_fmt_conv_420sp_to_420sp() *
@* *
@* Description : This function conversts the image from YUV420SP color *
@* space to 420SP color space(UV interleaved). *
@* *
@* Arguments : R0 pu1_y *
@* R1 pu1_uv *
@* R2 pu1_dest_y *
@* R3 pu1_dest_uv *
@* [R13 #40] u2_width *
@* [R13 #44] u2_height *
@* [R13 #48] u2_stridey *
@* [R13 #52] u2_stridechroma *
@* [R13 #56] u2_dest_stridey *
@* [R13 #60] u2_dest_stridechroma *
@* *
@* Values Returned : None *
@* *
@* Register Usage : R0 - R14 *
@* *
@* Stack Usage : 40 Bytes *
@* *
@* Interruptibility : Interruptible *
@* *
@* Known Limitations *
@* Assumptions: Image Width: Assumed to be multiple of 2 and *
@* Image Height: Assumed to be even. *
@* *
@* Revision History : *
@* DD MM YYYY Author(s) Changes (Describe the changes made) *
@* 16 05 2012 Naveen SR draft *
@* *
@*****************************************************************************/
.global ihevcd_fmt_conv_420sp_to_420sp_a9q
.type ihevcd_fmt_conv_420sp_to_420sp_a9q, %function
ihevcd_fmt_conv_420sp_to_420sp_a9q:
STMFD sp!,{r4-r12, lr}
LDR r5,[sp,#56] @//Load u2_dest_stridey
LDR r7,[sp,#48] @//Load u2_stridey
LDR r8,[sp,#40] @//Load u2_width
LDR r9,[sp,#44] @//Load u2_height
SUB r10,r7,r8 @// Src Y increment
SUB r11,r5,r8 @// Dst Y increment
@/* Copy Y */
MOV r4,r9 @// Copying height
y_row_loop:
MOV r6,r8 @// Copying width
y_col_loop:
PLD [r0, #128]
SUB r6,r6,#32
VLD1.8 D0,[r0]!
VLD1.8 D1,[r0]!
VLD1.8 D2,[r0]!
VLD1.8 D3,[r0]!
VST1.8 D0,[R2]!
VST1.8 D1,[R2]!
VST1.8 D2,[R2]!
VST1.8 D3,[R2]!
CMP r6,#32
BGE y_col_loop
CMP r6,#0
BEQ y_col_loop_end
@//If non-multiple of 16, then go back by few bytes to ensure 16 bytes can be read
@//Ex if width is 162, above loop will process 160 pixels. And
@//Both source and destination will point to 146th pixel and then 16 bytes will be read
@// and written using VLD1 and VST1
RSB r6,r6,#32
SUB r0,r0,r6
SUB R2,R2,r6
VLD1.8 D0,[r0]!
VLD1.8 D1,[r0]!
VLD1.8 D2,[r0]!
VLD1.8 D3,[r0]!
VST1.8 D0,[R2]!
VST1.8 D1,[R2]!
VST1.8 D2,[R2]!
VST1.8 D3,[R2]!
y_col_loop_end:
ADD r0, r0, r10
ADD R2, R2, r11
SUBS r4, r4, #1
BGT y_row_loop
@/* Copy UV */
LDR r5,[sp,#60] @//Load u2_dest_stridechroma
LDR r7,[sp,#52] @//Load u2_stridechroma
MOV r9,r9,LSR #1 @// height/2
@ MOV r8,r8,LSR #1 @// Width/2
MOV R2,R3 @pu1_dest_uv
SUB r10,r7,r8 @// Src UV increment
SUB r11,r5,r8 @// Dst UV increment
MOV r4,r9 @// Copying height
uv_row_loop:
MOV r6,r8 @// Copying width
uv_col_loop:
PLD [r1, #128]
SUB r6,r6,#16
VLD1.8 D0,[r1]!
VLD1.8 D1,[r1]!
VST1.8 D0,[R2]!
VST1.8 D1,[R2]!
CMP r6,#16
BGE uv_col_loop
CMP r6,#0
BEQ u_col_loop_end
@//If non-multiple of 16, then go back by few bytes to ensure 16 bytes can be read
@//Ex if width is 162, above loop will process 160 pixels. And
@//Both source and destination will point to 146th pixel and then 16 bytes will be read
@// and written using VLD1 and VST1
RSB r6,r6,#16
SUB r1,r1,r6
SUB R2,R2,r6
VLD1.8 D0, [r1]!
VLD1.8 D1, [r1]!
VST1.8 D0, [R2]!
VST1.8 D1, [R2]!
u_col_loop_end:
ADD r1, r1, r10
ADD R2, R2, r11
SUBS r4, r4, #1
BGT uv_row_loop
exit:
LDMFD sp!,{r4-r12, pc}
.section .note.GNU-stack,"",%progbits