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/*
* Simple IDCT
*
* Copyright (c) 2001 Michael Niedermayer <michaelni@gmx.at>
* Copyright (c) 2007 Mans Rullgard <mans@mansr.com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define W1 22725 /* cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 */
#define W2 21407 /* cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 */
#define W3 19266 /* cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 */
#define W4 16383 /* cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 */
#define W5 12873 /* cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 */
#define W6 8867 /* cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 */
#define W7 4520 /* cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 */
#define ROW_SHIFT 11
#define COL_SHIFT 20
#define W13 (W1 | (W3 << 16))
#define W26 (W2 | (W6 << 16))
#define W42 (W4 | (W2 << 16))
#define W42n (-W4&0xffff | (-W2 << 16))
#define W46 (W4 | (W6 << 16))
#define W57 (W5 | (W7 << 16))
.text
.align
w13: .long W13
w26: .long W26
w42: .long W42
w42n: .long W42n
w46: .long W46
w57: .long W57
/*
Compute partial IDCT of single row.
shift = left-shift amount
a1 = source address
a3 = row[2,0] <= 2 cycles
a4 = row[3,1]
ip = w42 <= 2 cycles
Output in registers v1--v8
*/
.macro idct_row shift
ldr lr, [pc, #(w46-.-8)] /* lr = W4 | (W6 << 16) */
mov a2, #(1<<(\shift-1))
smlad v1, a3, ip, a2
smlsd v4, a3, ip, a2
ldr ip, [pc, #(w13-.-8)] /* ip = W1 | (W3 << 16) */
ldr v7, [pc, #(w57-.-8)] /* v7 = W5 | (W7 << 16) */
smlad v2, a3, lr, a2
smlsd v3, a3, lr, a2
smuad v5, a4, ip /* v5 = B0 = W1*row[1] + W3*row[3] */
smusdx fp, a4, v7 /* fp = B3 = W7*row[1] - W5*row[3] */
ldr lr, [a1, #12] /* lr = row[7,5] */
pkhtb a3, ip, v7, asr #16 /* a4 = W7 | (W3 << 16) */
pkhbt a2, ip, v7, lsl #16 /* a2 = W1 | (W5 << 16) */
smusdx v6, a3, a4 /* v6 = -B1 = W7*row[3] - W3*row[1] */
smlad v5, lr, v7, v5 /* B0 += W5*row[5] + W7*row[7] */
smusdx v7, a4, a2 /* v7 = B2 = W5*row[1] - W1*row[3] */
ldr a4, [pc, #(w42n-.-8)] /* a4 = -W4 | (-W2 << 16) */
smlad v7, lr, a3, v7 /* B2 += W7*row[5] + W3*row[7] */
ldr a3, [a1, #4] /* a3 = row[6,4] */
smlsdx fp, lr, ip, fp /* B3 += W3*row[5] - W1*row[7] */
ldr ip, [pc, #(w46-.-8)] /* ip = W4 | (W6 << 16) */
smlad v6, lr, a2, v6 /* B1 -= W1*row[5] + W5*row[7] */
smlad v2, a3, a4, v2 /* A1 += -W4*row[4] - W2*row[6] */
smlsd v3, a3, a4, v3 /* A2 += -W4*row[4] + W2*row[6] */
smlad v1, a3, ip, v1 /* A0 += W4*row[4] + W6*row[6] */
smlsd v4, a3, ip, v4 /* A3 += W4*row[4] - W6*row[6] */
.endm
/*
Compute partial IDCT of half row.
shift = left-shift amount
a3 = row[2,0]
a4 = row[3,1]
ip = w42
Output in registers v1--v8
*/
.macro idct_row4 shift
ldr lr, [pc, #(w46-.-8)] /* lr = W4 | (W6 << 16) */
ldr v7, [pc, #(w57-.-8)] /* v7 = W5 | (W7 << 16) */
mov a2, #(1<<(\shift-1))
smlad v1, a3, ip, a2
smlsd v4, a3, ip, a2
ldr ip, [pc, #(w13-.-8)] /* ip = W1 | (W3 << 16) */
smlad v2, a3, lr, a2
smlsd v3, a3, lr, a2
smusdx fp, a4, v7 /* fp = B3 = W7*row[1] - W5*row[3] */
smuad v5, a4, ip /* v5 = B0 = W1*row[1] + W3*row[3] */
pkhtb a3, ip, v7, asr #16 /* a4 = W7 | (W3 << 16) */
pkhbt a2, ip, v7, lsl #16 /* a2 = W1 | (W5 << 16) */
smusdx v6, a3, a4 /* v6 = -B1 = W7*row[3] - W3*row[1] */
smusdx v7, a4, a2 /* v7 = B2 = W5*row[1] - W1*row[3] */
.endm
/*
Compute final part of IDCT single row without shift.
Input in registers v1--v8
Output in registers ip, v1--v3, lr, v5--v7
*/
.macro idct_finish
add ip, v1, v5 /* a2 = A0 + B0 */
sub lr, v1, v5 /* a3 = A0 - B0 */
sub v1, v2, v6 /* a3 = A1 + B1 */
add v5, v2, v6 /* a3 = A1 - B1 */
add v2, v3, v7 /* a2 = A2 + B2 */
sub v6, v3, v7 /* a2 = A2 - B2 */
add v3, v4, fp /* a3 = A3 + B3 */
sub v7, v4, fp /* a3 = A3 - B3 */
.endm
/*
Compute final part of IDCT single row.
shift = right-shift amount
Input/output in registers v1--v8
*/
.macro idct_finish_shift shift
add a4, v1, v5 /* a4 = A0 + B0 */
sub a3, v1, v5 /* a3 = A0 - B0 */
mov v1, a4, asr #\shift
mov v5, a3, asr #\shift
sub a4, v2, v6 /* a4 = A1 + B1 */
add a3, v2, v6 /* a3 = A1 - B1 */
mov v2, a4, asr #\shift
mov v6, a3, asr #\shift
add a4, v3, v7 /* a4 = A2 + B2 */
sub a3, v3, v7 /* a3 = A2 - B2 */
mov v3, a4, asr #\shift
mov v7, a3, asr #\shift
add a4, v4, fp /* a4 = A3 + B3 */
sub a3, v4, fp /* a3 = A3 - B3 */
mov v4, a4, asr #\shift
mov fp, a3, asr #\shift
.endm
/*
Compute final part of IDCT single row, saturating results at 8 bits.
shift = right-shift amount
Input/output in registers v1--v8
*/
.macro idct_finish_shift_sat shift
add a4, v1, v5 /* a4 = A0 + B0 */
sub ip, v1, v5 /* ip = A0 - B0 */
usat v1, #8, a4, asr #\shift
usat v5, #8, ip, asr #\shift
sub a4, v2, v6 /* a4 = A1 + B1 */
add ip, v2, v6 /* ip = A1 - B1 */
usat v2, #8, a4, asr #\shift
usat v6, #8, ip, asr #\shift
add a4, v3, v7 /* a4 = A2 + B2 */
sub ip, v3, v7 /* ip = A2 - B2 */
usat v3, #8, a4, asr #\shift
usat v7, #8, ip, asr #\shift
add a4, v4, fp /* a4 = A3 + B3 */
sub ip, v4, fp /* ip = A3 - B3 */
usat v4, #8, a4, asr #\shift
usat fp, #8, ip, asr #\shift
.endm
/*
Compute IDCT of single row, storing as column.
a1 = source
a2 = dest
*/
.align
.type idct_row_armv6, %function
.func idct_row_armv6
idct_row_armv6:
str lr, [sp, #-4]!
ldr lr, [a1, #12] /* lr = row[7,5] */
ldr ip, [a1, #4] /* ip = row[6,4] */
ldr a4, [a1, #8] /* a4 = row[3,1] */
ldr a3, [a1] /* a3 = row[2,0] */
orrs lr, lr, ip
cmpeq lr, a4
cmpeq lr, a3, lsr #16
beq 1f
str a2, [sp, #-4]!
ldr ip, [pc, #(w42-.-8)] /* ip = W4 | (W2 << 16) */
cmp lr, #0
beq 2f
idct_row ROW_SHIFT
b 3f
2: idct_row4 ROW_SHIFT
3: ldr a2, [sp], #4
idct_finish_shift ROW_SHIFT
strh v1, [a2]
strh v2, [a2, #(16*2)]
strh v3, [a2, #(16*4)]
strh v4, [a2, #(16*6)]
strh fp, [a2, #(16*1)]
strh v7, [a2, #(16*3)]
strh v6, [a2, #(16*5)]
strh v5, [a2, #(16*7)]
ldr pc, [sp], #4
1: mov a3, a3, lsl #3
strh a3, [a2]
strh a3, [a2, #(16*2)]
strh a3, [a2, #(16*4)]
strh a3, [a2, #(16*6)]
strh a3, [a2, #(16*1)]
strh a3, [a2, #(16*3)]
strh a3, [a2, #(16*5)]
strh a3, [a2, #(16*7)]
ldr pc, [sp], #4
.endfunc
/*
Compute IDCT of single column, read as row.
a1 = source
a2 = dest
*/
.align
.type idct_col_armv6, %function
.func idct_col_armv6
idct_col_armv6:
stmfd sp!, {a2, lr}
ldr a3, [a1] /* a3 = row[2,0] */
ldr ip, [pc, #(w42-.-8)] /* ip = W4 | (W2 << 16) */
ldr a4, [a1, #8] /* a4 = row[3,1] */
idct_row COL_SHIFT
ldr a2, [sp], #4
idct_finish_shift COL_SHIFT
strh v1, [a2]
strh v2, [a2, #(16*1)]
strh v3, [a2, #(16*2)]
strh v4, [a2, #(16*3)]
strh fp, [a2, #(16*4)]
strh v7, [a2, #(16*5)]
strh v6, [a2, #(16*6)]
strh v5, [a2, #(16*7)]
ldr pc, [sp], #4
.endfunc
/*
Compute IDCT of single column, read as row, store saturated 8-bit.
a1 = source
a2 = dest
a3 = line size
*/
.align
.type idct_col_put_armv6, %function
.func idct_col_put_armv6
idct_col_put_armv6:
stmfd sp!, {a2, a3, lr}
ldr a3, [a1] /* a3 = row[2,0] */
ldr ip, [pc, #(w42-.-8)] /* ip = W4 | (W2 << 16) */
ldr a4, [a1, #8] /* a4 = row[3,1] */
idct_row COL_SHIFT
ldmfd sp!, {a2, a3}
idct_finish_shift_sat COL_SHIFT
strb v1, [a2], a3
strb v2, [a2], a3
strb v3, [a2], a3
strb v4, [a2], a3
strb fp, [a2], a3
strb v7, [a2], a3
strb v6, [a2], a3
strb v5, [a2], a3
sub a2, a2, a3, lsl #3
ldr pc, [sp], #4
.endfunc
/*
Compute IDCT of single column, read as row, add/store saturated 8-bit.
a1 = source
a2 = dest
a3 = line size
*/
.align
.type idct_col_add_armv6, %function
.func idct_col_add_armv6
idct_col_add_armv6:
stmfd sp!, {a2, a3, lr}
ldr a3, [a1] /* a3 = row[2,0] */
ldr ip, [pc, #(w42-.-8)] /* ip = W4 | (W2 << 16) */
ldr a4, [a1, #8] /* a4 = row[3,1] */
idct_row COL_SHIFT
ldmfd sp!, {a2, a3}
idct_finish
ldrb a4, [a2]
ldrb v4, [a2, a3]
ldrb fp, [a2, a3, lsl #2]
add ip, a4, ip, asr #COL_SHIFT
usat ip, #8, ip
add v1, v4, v1, asr #COL_SHIFT
strb ip, [a2], a3
ldrb ip, [a2, a3]
usat v1, #8, v1
ldrb fp, [a2, a3, lsl #2]
add v2, ip, v2, asr #COL_SHIFT
usat v2, #8, v2
strb v1, [a2], a3
ldrb a4, [a2, a3]
ldrb ip, [a2, a3, lsl #2]
strb v2, [a2], a3
ldrb v4, [a2, a3]
ldrb v1, [a2, a3, lsl #2]
add v3, a4, v3, asr #COL_SHIFT
usat v3, #8, v3
add v7, v4, v7, asr #COL_SHIFT
usat v7, #8, v7
add v6, fp, v6, asr #COL_SHIFT
usat v6, #8, v6
add v5, ip, v5, asr #COL_SHIFT
usat v5, #8, v5
add lr, v1, lr, asr #COL_SHIFT
usat lr, #8, lr
strb v3, [a2], a3
strb v7, [a2], a3
strb v6, [a2], a3
strb v5, [a2], a3
strb lr, [a2], a3
sub a2, a2, a3, lsl #3
ldr pc, [sp], #4
.endfunc
/*
Compute 8 IDCT row transforms.
func = IDCT row->col function
width = width of columns in bytes
*/
.macro idct_rows func width
bl \func
add a1, a1, #(16*2)
add a2, a2, #\width
bl \func
add a1, a1, #(16*2)
add a2, a2, #\width
bl \func
add a1, a1, #(16*2)
add a2, a2, #\width
bl \func
sub a1, a1, #(16*5)
add a2, a2, #\width
bl \func
add a1, a1, #(16*2)
add a2, a2, #\width
bl \func
add a1, a1, #(16*2)
add a2, a2, #\width
bl \func
add a1, a1, #(16*2)
add a2, a2, #\width
bl \func
sub a1, a1, #(16*7)
.endm
.align
.global ff_simple_idct_armv6
.type ff_simple_idct_armv6, %function
.func ff_simple_idct_armv6
/* void ff_simple_idct_armv6(DCTELEM *data); */
ff_simple_idct_armv6:
stmfd sp!, {v1, v2, v3, v4, v5, v6, v7, fp, lr}
sub sp, sp, #128
mov a2, sp
idct_rows idct_row_armv6, 2
mov a2, a1
mov a1, sp
idct_rows idct_col_armv6, 2
add sp, sp, #128
ldmfd sp!, {v1, v2, v3, v4, v5, v6, v7, fp, pc}
.endfunc
.align
.global ff_simple_idct_add_armv6
.type ff_simple_idct_add_armv6, %function
.func ff_simple_idct_add_armv6
/* ff_simple_idct_add_armv6(uint8_t *dest, int line_size, DCTELEM *data); */
ff_simple_idct_add_armv6:
stmfd sp!, {a1, a2, v1, v2, v3, v4, v5, v6, v7, fp, lr}
sub sp, sp, #128
mov a1, a3
mov a2, sp
idct_rows idct_row_armv6, 2
mov a1, sp
ldr a2, [sp, #128]
ldr a3, [sp, #(128+4)]
idct_rows idct_col_add_armv6, 1
add sp, sp, #(128+8)
ldmfd sp!, {v1, v2, v3, v4, v5, v6, v7, fp, pc}
.endfunc
.align
.global ff_simple_idct_put_armv6
.type ff_simple_idct_put_armv6, %function
.func ff_simple_idct_put_armv6
/* ff_simple_idct_put_armv6(uint8_t *dest, int line_size, DCTELEM *data); */
ff_simple_idct_put_armv6:
stmfd sp!, {a1, a2, v1, v2, v3, v4, v5, v6, v7, fp, lr}
sub sp, sp, #128
mov a1, a3
mov a2, sp
idct_rows idct_row_armv6, 2
mov a1, sp
ldr a2, [sp, #128]
ldr a3, [sp, #(128+4)]
idct_rows idct_col_put_armv6, 1
add sp, sp, #(128+8)
ldmfd sp!, {v1, v2, v3, v4, v5, v6, v7, fp, pc}
.endfunc
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