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| @/*****************************************************************************
| @*
| @* 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
|
|
