--- /dev/null
+ @*****************************************************************************
+ @ i420_rv16.S : ARM NEONv1 I420 to RV16 chroma conversion
+ @*****************************************************************************
+ @ Copyright (C) 2011 Sébastien Toque
+ @ Rémi Denis-Courmont
+ @
+ @ This program 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.
+ @
+ @ 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 Lesser General Public License for more details.
+ @
+ @ You should have received a copy of the GNU Lesser General Public License
+ @ along with this program; if not, write to the Free Software Foundation,
+ @ Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ @****************************************************************************/
+
+ .syntax unified
+ .fpu neon
+ .text
+
+/* ARM */
+#define O1 r0
+#define O2 r1
+#define WIDTH r2
+#define HEIGHT r3
+#define Y1 r4
+#define Y2 r5
+#define U r6
+#define V r7
+#define YPITCH r8
+#define OPAD r10
+#define YPAD r11
+#define COUNT ip
+#define OPITCH lr
+
+/* NEON */
+#define coefY D0
+#define coefRV D1
+#define coefGU D2
+#define coefGV D3
+#define coefBU D4
+#define Rc Q3
+#define Gc Q4
+#define Bc Q5
+
+#define u D24
+#define v D25
+#define y1 D18
+#define y2 D19
+
+#define chro_r Q6
+#define chro_g Q7
+#define chro_b Q8
+#define lumi1 Q15
+#define lumi2 Q10
+#define red16_1 Q9
+#define green16_1 Q10
+#define blue16_1 Q11
+#define red16_2 Q12
+#define green16_2 Q13
+#define blue16_2 Q14
+
+#define red1 D25
+#define green1 D26
+#define blue1 D27
+#define red2 D29
+#define green2 D30
+#define blue2 D31
+
+#define out1l D24
+#define out1h D25
+#define out2l D28
+#define out2h D29
+
+coefficients:
+ .short -15872
+ .short 4992
+ .short -18432
+
+ .align 2
+ .global i420_rv16_neon
+ .type i420_rv16_neon, %function
+i420_rv16_neon:
+ push {r4-r8,r10-r11,lr}
+ vpush {q4-q7}
+
+ /* load arguments */
+ ldmia r0, {O1, OPITCH}
+ ldmia r1, {Y1, U, V, YPITCH}
+
+ /* round the width to be a multiple of 16 */
+ ands OPAD, WIDTH, #15
+ sub WIDTH, WIDTH, OPAD
+ addne WIDTH, WIDTH, #16
+
+ /* init constants (scale value by 64) */
+ vmov.u8 coefY, #74
+ vmov.u8 coefRV, #115
+ vmov.u8 coefGU, #14
+ vmov.u8 coefGV, #34
+ vmov.u8 coefBU, #135
+ adr OPAD, coefficients
+ vld1.s16 {d6[], d7[]}, [OPAD]!
+ vld1.s16 {d8[], d9[]}, [OPAD]!
+ vld1.s16 {d10[], d11[]}, [OPAD]!
+
+ /* init padding */
+ cmp HEIGHT, #0
+ sub OPAD, OPITCH, WIDTH, lsl #1
+ sub YPAD, YPITCH, WIDTH
+
+loop_row:
+ movsgt COUNT, WIDTH
+ add O2, O1, OPITCH
+ add Y2, Y1, YPITCH
+ /* exit if all rows have been processed */
+ vpople {q4-q7}
+ pople {r4-r8,r10-r11,pc}
+
+loop_col:
+
+ /* Common U & V */
+
+ vld1.u8 {u}, [U,:64]!
+ vld1.u8 {v}, [V,:64]!
+
+ /* Y Top Row */
+ vld2.u8 {y1,y2}, [Y1,:128]!
+
+ vmull.u8 Q14, v, coefRV
+ vmull.u8 Q11, u, coefGU
+ vmull.u8 Q13, u, coefBU
+ vmlal.u8 Q11, v, coefGV
+
+ vmull.u8 lumi2, y2, coefY
+ vmull.u8 lumi1, y1, coefY
+ vadd.s16 chro_r, Rc, Q14
+ vadd.s16 chro_b, Bc, Q13
+ vsub.s16 chro_g, Gc, Q11
+
+ pld [U]
+ pld [V]
+
+ /* chrominance + luminance */
+ vqadd.s16 red16_2, lumi2, chro_r
+ vqadd.s16 green16_2, lumi2, chro_g
+ vqadd.s16 blue16_2, lumi2, chro_b
+ vqadd.s16 red16_1, lumi1, chro_r
+ vqadd.s16 green16_1, lumi1, chro_g
+ vqadd.s16 blue16_1, lumi1, chro_b
+
+ /* clamp (divide by 64) */
+ vqrshrun.s16 green2, green16_2, #6
+ vqrshrun.s16 blue2, blue16_2, #6
+ vqrshrun.s16 red2, red16_2, #6
+ vqrshrun.s16 green1, green16_1, #6
+ vqrshrun.s16 red1, red16_1, #6
+ vqrshrun.s16 blue1, blue16_1, #6
+
+ pld [Y1]
+
+ /* pack into RGB565 */
+ vshl.u8 out2l, green2, #3 // low 2a
+ vsri.u8 out2h, green2, #5 // high 2
+ vshl.u8 out1l, green1, #3 // low 1a
+ vsri.u8 out1h, green1, #5 // high 1
+ vsri.u8 out2l, blue2, #3 // low 2b
+ vsri.u8 out1l, blue1, #3 // low 1b
+
+ /* Y Bottom Row */
+ vld2.u8 {y1,y2}, [Y2,:128]!
+
+ /* Top Row output */
+ vzip.u8 out1h, out2h
+ vmull.u8 lumi2, y2, coefY
+ vzip.u8 out1l, out2l
+ vmull.u8 lumi1, y1, coefY
+ vst2.u8 {out1l, out1h}, [O1,:128]!
+ vst2.u8 {out2l, out2h}, [O1,:128]!
+
+ /* chrominance + luminance */
+ vqadd.s16 green16_2, lumi2, chro_g
+ vqadd.s16 red16_2, lumi2, chro_r
+ vqadd.s16 blue16_2, lumi2, chro_b
+ vqadd.s16 red16_1, lumi1, chro_r
+ vqadd.s16 green16_1, lumi1, chro_g
+ vqadd.s16 blue16_1, lumi1, chro_b
+
+ /* clamp (divide by 64) */
+ vqrshrun.s16 green2, green16_2, #6
+ vqrshrun.s16 blue2, blue16_2, #6
+ vqrshrun.s16 red2, red16_2, #6
+ vqrshrun.s16 green1, green16_1, #6
+ vqrshrun.s16 red1, red16_1, #6
+ vqrshrun.s16 blue1, blue16_1, #6
+
+ pld [Y1]
+
+ /* pack into RGB565 */
+ vshl.u8 out2l, green2, #3 // low 2a
+ vsri.u8 out2h, green2, #5 // high 2
+ vshl.u8 out1l, green1, #3 // low 1a
+ vsri.u8 out1h, green1, #5 // high 1
+ vsri.u8 out2l, blue2, #3 // low 2b
+ vsri.u8 out1l, blue1, #3 // low 1b
+
+ vzip.u8 out1h, out2h
+ vzip.u8 out1l, out2l
+ vst2.u8 {out1l, out1h}, [O2,:128]!
+ vst2.u8 {out2l, out2h}, [O2,:128]!
+
+ /* next columns (x16) */
+ subs COUNT, COUNT, #16
+ bgt loop_col
+
+ /* next rows (x2) */
+ subs HEIGHT, #2
+ add O1, O2, OPAD
+ add Y1, Y2, YPAD
+ add U, U, YPAD, lsr #1
+ add V, V, YPAD, lsr #1
+ b loop_row
projects / vlc / commitdiff