| /* |
| * idct.c |
| * Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org> |
| * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca> |
| * |
| * This file is part of mpeg2dec, a free MPEG-2 video stream decoder. |
| * See http://libmpeg2.sourceforge.net/ for updates. |
| * |
| * mpeg2dec is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * mpeg2dec 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 General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| #include "plugin.h" |
| |
| #include "mpeg2dec_config.h" |
| |
| #include "mpeg2.h" |
| #include "attributes.h" |
| #include "mpeg2_internal.h" |
| |
| /* 101100011001 */ |
| #define W1 2841 /* 2048 * sqrt (2) * cos (1 * pi / 16) */ |
| /* 101001110100 */ |
| #define W2 2676 /* 2048 * sqrt (2) * cos (2 * pi / 16) */ |
| /* 100101101000 */ |
| #define W3 2408 /* 2048 * sqrt (2) * cos (3 * pi / 16) */ |
| /* 011001001001 */ |
| #define W5 1609 /* 2048 * sqrt (2) * cos (5 * pi / 16) */ |
| /* 010001010100 */ |
| #define W6 1108 /* 2048 * sqrt (2) * cos (6 * pi / 16) */ |
| /* 001000110101 */ |
| #define W7 565 /* 2048 * sqrt (2) * cos (7 * pi / 16) */ |
| |
| /* idct main entry point */ |
| void (* mpeg2_idct_copy) (int16_t * block, uint8_t * dest, int stride); |
| void (* mpeg2_idct_add) (int last, int16_t * block, |
| uint8_t * dest, int stride); |
| |
| /* |
| * In legal streams, the IDCT output should be between -384 and +384. |
| * In corrupted streams, it is possible to force the IDCT output to go |
| * to +-3826 - this is the worst case for a column IDCT where the |
| * column inputs are 16-bit values. |
| */ |
| #if 0 |
| #define BUTTERFLY(t0,t1,W0,W1,d0,d1) \ |
| do { \ |
| t0 = W0 * d0 + W1 * d1; \ |
| t1 = W0 * d1 - W1 * d0; \ |
| } while (0) |
| #else |
| #define BUTTERFLY(t0,t1,W0,W1,d0,d1) \ |
| do { \ |
| int tmp = W0 * (d0 + d1); \ |
| t0 = tmp + (W1 - W0) * d1; \ |
| t1 = tmp - (W1 + W0) * d0; \ |
| } while (0) |
| #endif |
| |
| /* Custom calling convention: |
| * r0 contains block pointer and is non-volatile |
| * all non-volatile c context saved and restored on its behalf |
| */ |
| static void idct (int16_t * block) __attribute__((naked,used)); |
| static void idct (int16_t * block) |
| { |
| asm volatile ( |
| "add r12, r0, #128 \n" |
| "1: \n" |
| "ldrsh r1, [r0, #0] \n" /* d0 */ |
| "ldrsh r2, [r0, #2] \n" /* d1 */ |
| "ldrsh r3, [r0, #4] \n" /* d2 */ |
| "ldrsh r4, [r0, #6] \n" /* d3 */ |
| "ldrsh r5, [r0, #8] \n" /* d0 */ |
| "ldrsh r6, [r0, #10] \n" /* d1 */ |
| "ldrsh r7, [r0, #12] \n" /* d2 */ |
| "ldrsh r8, [r0, #14] \n" /* d3 */ |
| "orrs r9, r2, r3 \n" |
| "orreqs r9, r4, r5 \n" |
| "orreqs r9, r6, r7 \n" |
| "cmpeq r8, #0 \n" |
| "bne 2f \n" |
| "mov r1, r1, asl #15 \n" |
| "bic r1, r1, #0x8000 \n" |
| "orr r1, r1, r1, lsr #16 \n" |
| "str r1, [r0], #4 \n" |
| "str r1, [r0], #4 \n" |
| "str r1, [r0], #4 \n" |
| "str r1, [r0], #4 \n" |
| "cmp r0, r12 \n" |
| "blo 1b \n" |
| "b 3f \n" |
| "2: \n" |
| "mov r1, r1, asl #11 \n" /* r1 = d0 = (block[0] << 11) + 2048 */ |
| "add r1, r1, #2048 \n" |
| "add r1, r1, r3, asl #11 \n" /* r1 = t0 = d0 + (block[2] << 11) */ |
| "sub r3, r1, r3, asl #12 \n" /* r3 = t1 = d0 - (block[2] << 11) */ |
| |
| "add r9, r2, r4 \n" /* r9 = tmp = (d1+d3)*(1108/4) */ |
| "add r10, r9, r9, asl #2 \n" |
| "add r10, r10, r9, asl #4 \n" |
| "add r9, r10, r9, asl #8 \n" |
| |
| "add r10, r2, r2, asl #4 \n" /* r2 = t2 = tmp + (d1*(1568/32)*8) */ |
| "add r2, r10, r2, asl #5 \n" |
| "add r2, r9, r2, asl #3 \n" |
| |
| "add r10, r4, r4, asl #2 \n" /* r4 = t3 = tmp - (d3*(3784/8)*2) */ |
| "rsb r10, r10, r4, asl #6 \n" |
| "add r4, r4, r10, asl #3 \n" |
| "sub r4, r9, r4, asl #1 \n" |
| /* t2 & t3 are 1/4 final value here */ |
| "add r1, r1, r2, asl #2 \n" /* r1 = a0 = t0 + t2 */ |
| "sub r2, r1, r2, asl #3 \n" /* r2 = a3 = t0 - t2 */ |
| "add r3, r3, r4, asl #2 \n" /* r3 = a1 = t1 + t3 */ |
| "sub r4, r3, r4, asl #3 \n" /* r4 = a2 = t1 - t3 */ |
| |
| "add r9, r8, r5 \n" /* r9 = tmp = 565*(d3 + d0) */ |
| "add r10, r9, r9, asl #4 \n" |
| "add r10, r10, r10, asl #5 \n" |
| "add r9, r10, r9, asl #2 \n" |
| |
| "add r10, r5, r5, asl #4 \n" /* r5 = t0 = tmp + (((2276/4)*d0)*4) */ |
| "add r10, r10, r10, asl #5 \n" |
| "add r5, r10, r5, asl #3 \n" |
| "add r5, r9, r5, asl #2 \n" |
| |
| "add r10, r8, r8, asl #2 \n" /* r8 = t1 = tmp - (((3406/2)*d3)*2) */ |
| "add r10, r10, r10, asl #4 \n" |
| "add r10, r10, r8, asl #7 \n" |
| "rsb r8, r8, r10, asl #3 \n" |
| "sub r8, r9, r8, asl #1 \n" |
| |
| "add r9, r6, r7 \n" /* r9 = tmp = (2408/8)*(d1 + d2) */ |
| "add r10, r9, r9, asl #3 \n" |
| "add r10, r10, r10, asl #5 \n" |
| "add r9, r10, r9, asl #2 \n" |
| |
| "add r10, r7, r7, asl #3 \n" /* r7 = t2 = (tmp*8) - 799*d2 */ |
| "add r10, r10, r7, asl #4 \n" |
| "rsb r7, r7, r10, asl #5 \n" |
| "rsb r7, r7, r9, asl #3 \n" |
| |
| "sub r10, r6, r6, asl #4 \n" /* r6 = t3 = (tmp*8) - 4017*d1 */ |
| "sub r10, r10, r6, asl #6 \n" |
| "add r10, r10, r6, asl #12 \n" |
| "add r6, r10, r6 \n" |
| "rsb r6, r6, r9, asl #3 \n" |
| /* t0 = r5, t1 = r8, t2 = r7, t3 = r6*/ |
| "add r9, r5, r7 \n" /* r9 = b0 = t0 + t2 */ |
| "add r10, r8, r6 \n" /* r10 = b3 = t1 + t3 */ |
| "sub r5, r5, r7 \n" /* t0 -= t2 */ |
| "sub r8, r8, r6 \n" /* t1 -= t3 */ |
| "add r6, r5, r8 \n" /* r6 = t0 + t1 */ |
| "sub r7, r5, r8 \n" /* r7 = t0 - t1 */ |
| |
| "add r11, r6, r6, asr #2 \n" /* r6 = b1 = r6*(181/128) */ |
| "add r11, r11, r11, asr #5 \n" |
| "add r6, r11, r6, asr #3 \n" |
| "add r11, r7, r7, asr #2 \n" /* r7 = b2 = r7*(181/128) */ |
| "add r11, r11, r11, asr #5 \n" |
| "add r7, r11, r7, asr #3 \n" |
| /* r1 = a0, r3 = a1, r4 = a2, r2 = a3 */ |
| /* r9 = b0, r6 = b1*2, r7 = b2*2, r10 = b3 */ |
| "add r5, r1, r9 \n" /* block[0] = (a0 + b0) >> 12 */ |
| "mov r5, r5, asr #12 \n" |
| "strh r5, [r0], #2 \n" |
| "add r8, r3, r6, asr #1 \n" /* block[1] = (a1 + b1) >> 12 */ |
| "mov r8, r8, asr #12 \n" |
| "strh r8, [r0], #2 \n" |
| "add r5, r4, r7, asr #1 \n" /* block[2] = (a2 + b2) >> 12 */ |
| "mov r5, r5, asr #12 \n" |
| "strh r5, [r0], #2 \n" |
| "add r8, r2, r10 \n" /* block[3] = (a3 + b3) >> 12 */ |
| "mov r8, r8, asr #12 \n" |
| "strh r8, [r0], #2 \n" |
| "sub r5, r2, r10 \n" /* block[4] = (a3 - b3) >> 12 */ |
| "mov r5, r5, asr #12 \n" |
| "strh r5, [r0], #2 \n" |
| "sub r8, r4, r7, asr #1 \n" /* block[5] = (a2 - b2) >> 12 */ |
| "mov r8, r8, asr #12 \n" |
| "strh r8, [r0], #2 \n" |
| "sub r5, r3, r6, asr #1 \n" /* block[6] = (a1 - b1) >> 12 */ |
| "mov r5, r5, asr #12 \n" |
| "strh r5, [r0], #2 \n" |
| "sub r8, r1, r9 \n" /* block[7] = (a0 - b0) >> 12 */ |
| "mov r8, r8, asr #12 \n" |
| "strh r8, [r0], #2 \n" |
| "cmp r0, r12 \n" |
| "blo 1b \n" |
| "3: \n" |
| "sub r0, r0, #128 \n" |
| "add r12, r0, #16 \n" |
| "4: \n" |
| "ldrsh r1, [r0, #0*8] \n" /* d0 */ |
| "ldrsh r2, [r0, #2*8] \n" /* d1 */ |
| "ldrsh r3, [r0, #4*8] \n" /* d2 */ |
| "ldrsh r4, [r0, #6*8] \n" /* d3 */ |
| "ldrsh r5, [r0, #8*8] \n" /* d0 */ |
| "ldrsh r6, [r0, #10*8] \n" /* d1 */ |
| "ldrsh r7, [r0, #12*8] \n" /* d2 */ |
| "ldrsh r8, [r0, #14*8] \n" /* d3 */ |
| |
| "mov r1, r1, asl #11 \n" /* r1 = d0 = (block[0] << 11) + 2048 */ |
| "add r1, r1, #65536 \n" |
| "add r1, r1, r3, asl #11 \n" /* r1 = t0 = d0 + d2:(block[2] << 11) */ |
| "sub r3, r1, r3, asl #12 \n" /* r3 = t1 = d0 - d2:(block[2] << 11) */ |
| |
| "add r9, r2, r4 \n" /* r9 = tmp = (d1+d3)*(1108/4) */ |
| "add r10, r9, r9, asl #2 \n" |
| "add r10, r10, r9, asl #4 \n" |
| "add r9, r10, r9, asl #8 \n" |
| |
| "add r11, r2, r2, asl #4 \n" /* r2 = t2 = tmp + (d1*(1568/32)*8) */ |
| "add r2, r11, r2, asl #5 \n" |
| "add r2, r9, r2, asl #3 \n" |
| |
| "add r10, r4, r4, asl #2 \n" /* r4 = t3 = tmp - (d3*(3784/8)*2) */ |
| "rsb r10, r10, r4, asl #6 \n" |
| "add r4, r4, r10, asl #3 \n" |
| "sub r4, r9, r4, asl #1 \n" |
| /* t2 & t3 are 1/4 final value here */ |
| "add r1, r1, r2, asl #2 \n" /* r1 = a0 = t0 + t2 */ |
| "sub r2, r1, r2, asl #3 \n" /* r2 = a3 = t0 - t2 */ |
| "add r3, r3, r4, asl #2 \n" /* r3 = a1 = t1 + t3 */ |
| "sub r4, r3, r4, asl #3 \n" /* r4 = a2 = t1 - t3 */ |
| |
| "add r9, r8, r5 \n" /* r9 = tmp = 565*(d3 + d0) */ |
| "add r10, r9, r9, asl #4 \n" |
| "add r10, r10, r10, asl #5 \n" |
| "add r9, r10, r9, asl #2 \n" |
| |
| "add r10, r5, r5, asl #4 \n" /* r5 = t0 = tmp + (((2276/4)*d0)*4) */ |
| "add r10, r10, r10, asl #5 \n" |
| "add r5, r10, r5, asl #3 \n" |
| "add r5, r9, r5, asl #2 \n" |
| |
| "add r10, r8, r8, asl #2 \n" /* r8 = t1 = tmp - (((3406/2)*d3)*2) */ |
| "add r10, r10, r10, asl #4 \n" |
| "add r10, r10, r8, asl #7 \n" |
| "rsb r8, r8, r10, asl #3 \n" |
| "sub r8, r9, r8, asl #1 \n" |
| |
| "add r9, r6, r7 \n" /* r9 = tmp = (2408/8)*(d1 + d2) */ |
| "add r10, r9, r9, asl #3 \n" |
| "add r10, r10, r10, asl #5 \n" |
| "add r9, r10, r9, asl #2 \n" |
| |
| "add r10, r7, r7, asl #3 \n" /* r7 = t2 = (tmp*8) - 799*d2 */ |
| "add r10, r10, r7, asl #4 \n" |
| "rsb r7, r7, r10, asl #5 \n" |
| "rsb r7, r7, r9, asl #3 \n" |
| |
| "sub r10, r6, r6, asl #4 \n" /* r6 = t3 = (tmp*8) - 4017*d1 */ |
| "sub r10, r10, r6, asl #6 \n" |
| "add r10, r10, r6, asl #12 \n" |
| "add r6, r10, r6 \n" |
| "rsb r6, r6, r9, asl #3 \n" |
| /* t0=r5, t1=r8, t2=r7, t3=r6*/ |
| "add r9, r5, r7 \n" /* r9 = b0 = t0 + t2 */ |
| "add r10, r8, r6 \n" /* r10 = b3 = t1 + t3 */ |
| "sub r5, r5, r7 \n" /* t0 -= t2 */ |
| "sub r8, r8, r6 \n" /* t1 -= t3 */ |
| "add r6, r5, r8 \n" /* r6 = t0 + t1 */ |
| "sub r7, r5, r8 \n" /* r7 = t0 - t1 */ |
| |
| "add r11, r6, r6, asr #2 \n" /* r6 = b1 = r5*(181/128) */ |
| "add r11, r11, r11, asr #5 \n" |
| "add r6, r11, r6, asr #3 \n" |
| "add r11, r7, r7, asr #2 \n" /* r7 = b2 = r6*(181/128) */ |
| "add r11, r11, r11, asr #5 \n" |
| "add r7, r11, r7, asr #3 \n" |
| /* r1 = a0, r3 = a1, r4 = a2, r2 = a3 */ |
| /* r9 = b0, r6 = b1*2, r7 = b2*2, r10 = b3 */ |
| "add r5, r1, r9 \n" /* block[0] = (a0 + b0) >> 17 */ |
| "mov r5, r5, asr #17 \n" |
| "strh r5, [r0, #0*8] \n" |
| "add r8, r3, r6, asr #1 \n" /* block[1] = (a1 + b1) >> 17 */ |
| "mov r8, r8, asr #17 \n" |
| "strh r8, [r0, #2*8] \n" |
| "add r5, r4, r7, asr #1 \n" /* block[2] = (a2 + b2) >> 17 */ |
| "mov r5, r5, asr #17 \n" |
| "strh r5, [r0, #4*8] \n" |
| "add r8, r2, r10 \n" /* block[3] = (a3 + b3) >> 17 */ |
| "mov r8, r8, asr #17 \n" |
| "strh r8, [r0, #6*8] \n" |
| "sub r5, r2, r10 \n" /* block[4] = (a3 - b3) >> 17 */ |
| "mov r5, r5, asr #17 \n" |
| "strh r5, [r0, #8*8] \n" |
| "sub r8, r4, r7, asr #1 \n" /* block[5] = (a2 - b2) >> 17 */ |
| "mov r8, r8, asr #17 \n" |
| "strh r8, [r0, #10*8] \n" |
| "sub r5, r3, r6, asr #1 \n" /* block[6] = (a1 - b1) >> 17 */ |
| "mov r5, r5, asr #17 \n" |
| "strh r5, [r0, #12*8] \n" |
| "sub r8, r1, r9 \n" /* block[7] = (a0 - b0) >> 17 */ |
| "mov r8, r8, asr #17 \n" |
| "strh r8, [r0, #14*8] \n" |
| "add r0, r0, #2 \n" |
| "cmp r0, r12 \n" |
| "blo 4b \n" |
| "sub r0, r0, #16 \n" |
| "bx lr \n" |
| ); |
| (void)block; |
| } |
| |
| static void mpeg2_idct_copy_c (int16_t * block, uint8_t * dest, |
| const int stride) __attribute__((naked)); |
| static void mpeg2_idct_copy_c (int16_t * block, uint8_t * dest, |
| const int stride) |
| { |
| asm volatile( |
| "stmfd sp!, { r1-r2, \ |
| r4-r12, lr } \n" |
| "bl idct \n" |
| "ldmfd sp!, { r1-r2 } \n" |
| "mov r11, #0 \n" |
| "add r12, r0, #128 \n" |
| "1: \n" |
| "ldrsh r3, [r0, #0] \n" |
| "ldrsh r4, [r0, #2] \n" |
| "ldrsh r5, [r0, #4] \n" |
| "ldrsh r6, [r0, #6] \n" |
| "ldrsh r7, [r0, #8] \n" |
| "ldrsh r8, [r0, #10] \n" |
| "ldrsh r9, [r0, #12] \n" |
| "ldrsh r10, [r0, #14] \n" |
| "cmp r3, #255 \n" |
| "mvnhi r3, r3, asr #31 \n" |
| "strb r3, [r1, #0] \n" |
| "str r11, [r0], #4 \n" |
| "cmp r4, #255 \n" |
| "mvnhi r4, r4, asr #31 \n" |
| "strb r4, [r1, #1] \n" |
| "cmp r5, #255 \n" |
| "mvnhi r5, r5, asr #31 \n" |
| "strb r5, [r1, #2] \n" |
| "str r11, [r0], #4 \n" |
| "cmp r6, #255 \n" |
| "mvnhi r6, r6, asr #31 \n" |
| "strb r6, [r1, #3] \n" |
| "cmp r7, #255 \n" |
| "mvnhi r7, r7, asr #31 \n" |
| "strb r7, [r1, #4] \n" |
| "str r11, [r0], #4 \n" |
| "cmp r8, #255 \n" |
| "mvnhi r8, r8, asr #31 \n" |
| "strb r8, [r1, #5] \n" |
| "cmp r9, #255 \n" |
| "mvnhi r9, r9, asr #31 \n" |
| "strb r9, [r1, #6] \n" |
| "str r11, [r0], #4 \n" |
| "cmp r10, #255 \n" |
| "mvnhi r10, r10, asr #31 \n" |
| "strb r10, [r1, #7] \n" |
| "add r1, r1, r2 \n" |
| "cmp r0, r12 \n" |
| "blo 1b \n" |
| "ldmfd sp!, { r4-r12, pc } \n" |
| ); |
| (void)block; (void)dest; (void)stride; |
| } |
| |
| static void mpeg2_idct_add_c (int last, int16_t * block, |
| uint8_t * dest, const int stride) __attribute__((naked)); |
| static void mpeg2_idct_add_c (int last, int16_t * block, |
| uint8_t * dest, const int stride) |
| { |
| asm volatile ( |
| "cmp r0, #129 \n" |
| "mov r0, r1 \n" |
| "ldreqsh r1, [r0, #0] \n" |
| "bne 1f \n" |
| "and r1, r1, #0x70 \n" |
| "cmp r1, #0x40 \n" |
| "bne 3f \n" |
| "1: \n" |
| "stmfd sp!, { r2-r12, lr } \n" |
| "bl idct \n" |
| "ldmfd sp!, { r1-r2 } \n" |
| "mov r11, #0 \n" |
| "add r12, r0, #128 \n" |
| "2: \n" |
| "ldrb r3, [r1, #0] \n" |
| "ldrb r4, [r1, #1] \n" |
| "ldrb r5, [r1, #2] \n" |
| "ldrb r6, [r1, #3] \n" |
| "ldrsh r7, [r0, #0] \n" |
| "ldrsh r8, [r0, #2] \n" |
| "ldrsh r9, [r0, #4] \n" |
| "ldrsh r10, [r0, #6] \n" |
| "add r7, r7, r3 \n" |
| "ldrb r3, [r1, #4] \n" |
| "cmp r7, #255 \n" |
| "mvnhi r7, r7, asr #31 \n" |
| "strb r7, [r1, #0] \n" |
| "ldrsh r7, [r0, #8] \n" |
| "add r8, r8, r4 \n" |
| "ldrb r4, [r1, #5] \n" |
| "cmp r8, #255 \n" |
| "mvnhi r8, r8, asr #31 \n" |
| "strb r8, [r1, #1] \n" |
| "ldrsh r8, [r0, #10] \n" |
| "add r9, r9, r5 \n" |
| "ldrb r5, [r1, #6] \n" |
| "cmp r9, #255 \n" |
| "mvnhi r9, r9, asr #31 \n" |
| "strb r9, [r1, #2] \n" |
| "ldrsh r9, [r0, #12] \n" |
| "add r10, r10, r6 \n" |
| "ldrb r6, [r1, #7] \n" |
| "cmp r10, #255 \n" |
| "mvnhi r10, r10, asr #31 \n" |
| "strb r10, [r1, #3] \n" |
| "ldrsh r10, [r0, #14] \n" |
| "str r11, [r0], #4 \n" |
| "add r7, r7, r3 \n" |
| "cmp r7, #255 \n" |
| "mvnhi r7, r7, asr #31 \n" |
| "strb r7, [r1, #4] \n" |
| "str r11, [r0], #4 \n" |
| "add r8, r8, r4 \n" |
| "cmp r8, #255 \n" |
| "mvnhi r8, r8, asr #31 \n" |
| "strb r8, [r1, #5] \n" |
| "str r11, [r0], #4 \n" |
| "add r9, r9, r5 \n" |
| "cmp r9, #255 \n" |
| "mvnhi r9, r9, asr #31 \n" |
| "strb r9, [r1, #6] \n" |
| "add r10, r10, r6 \n" |
| "cmp r10, #255 \n" |
| "mvnhi r10, r10, asr #31 \n" |
| "strb r10, [r1, #7] \n" |
| "str r11, [r0], #4 \n" |
| "add r1, r1, r2 \n" |
| "cmp r0, r12 \n" |
| "blo 2b \n" |
| "ldmfd sp!, { r4-r12, pc } \n" |
| "3: \n" |
| "stmfd sp!, { r4-r11 } \n" |
| "ldrsh r1, [r0, #0] \n" /* r1 = block[0] */ |
| "mov r11, #0 \n" |
| "strh r11, [r0, #0] \n" /* block[0] = 0 */ |
| "strh r11, [r0, #126] \n" /* block[63] = 0 */ |
| "add r1, r1, #64 \n" /* r1 = DC << 7 */ |
| "add r0, r2, r3, asl #3 \n" |
| "4: \n" |
| "ldrb r4, [r2, #0] \n" |
| "ldrb r5, [r2, #1] \n" |
| "ldrb r6, [r2, #2] \n" |
| "ldrb r7, [r2, #3] \n" |
| "ldrb r8, [r2, #4] \n" |
| "ldrb r9, [r2, #5] \n" |
| "ldrb r10, [r2, #6] \n" |
| "ldrb r11, [r2, #7] \n" |
| "add r4, r4, r1, asr #7 \n" |
| "cmp r4, #255 \n" |
| "mvnhi r4, r4, asr #31 \n" |
| "strb r4, [r2, #0] \n" |
| "add r5, r5, r1, asr #7 \n" |
| "cmp r5, #255 \n" |
| "mvnhi r5, r5, asr #31 \n" |
| "strb r5, [r2, #1] \n" |
| "add r6, r6, r1, asr #7 \n" |
| "cmp r6, #255 \n" |
| "mvnhi r6, r6, asr #31 \n" |
| "strb r6, [r2, #2] \n" |
| "add r7, r7, r1, asr #7 \n" |
| "cmp r7, #255 \n" |
| "mvnhi r7, r7, asr #31 \n" |
| "strb r7, [r2, #3] \n" |
| "add r8, r8, r1, asr #7 \n" |
| "cmp r8, #255 \n" |
| "mvnhi r8, r8, asr #31 \n" |
| "strb r8, [r2, #4] \n" |
| "add r9, r9, r1, asr #7 \n" |
| "cmp r9, #255 \n" |
| "mvnhi r9, r9, asr #31 \n" |
| "strb r9, [r2, #5] \n" |
| "add r10, r10, r1, asr #7 \n" |
| "cmp r10, #255 \n" |
| "mvnhi r10, r10, asr #31 \n" |
| "strb r10, [r2, #6] \n" |
| "add r11, r11, r1, asr #7 \n" |
| "cmp r11, #255 \n" |
| "mvnhi r11, r11, asr #31 \n" |
| "strb r11, [r2, #7] \n" |
| "add r2, r2, r3 \n" |
| "cmp r2, r0 \n" |
| "blo 4b \n" |
| "ldmfd sp!, { r4-r11 } \n" |
| "bx lr \n" |
| ); |
| (void)last; (void)block; (void)dest; (void)stride; |
| } |
| |
| void mpeg2_idct_init (void) |
| { |
| extern uint8_t mpeg2_scan_norm[64]; |
| extern uint8_t mpeg2_scan_alt[64]; |
| int i, j; |
| |
| mpeg2_idct_copy = mpeg2_idct_copy_c; |
| mpeg2_idct_add = mpeg2_idct_add_c; |
| |
| for (i = 0; i < 64; i++) |
| { |
| j = mpeg2_scan_norm[i]; |
| mpeg2_scan_norm[i] = ((j & 0x36) >> 1) | ((j & 0x09) << 2); |
| |
| j = mpeg2_scan_alt[i]; |
| mpeg2_scan_alt[i] = ((j & 0x36) >> 1) | ((j & 0x09) << 2); |
| } |
| } |