/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * * Copyright (C) 2007 by Michael Sevakis * * This program 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. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ****************************************************************************/ #include "config.h" .syntax unified .global mpeg2_idct_copy .type mpeg2_idct_copy, %function .global mpeg2_idct_add .type mpeg2_idct_add, %function /* Custom calling convention: * r0 contains block pointer and is non-volatile * all non-volatile c context saved and restored on its behalf */ .idct: add r12, r0, #128 1: ldrsh r1, [r0, #0] /* d0 */ ldrsh r2, [r0, #2] /* d1 */ ldrsh r3, [r0, #4] /* d2 */ ldrsh r4, [r0, #6] /* d3 */ ldrsh r5, [r0, #8] /* d0 */ ldrsh r6, [r0, #10] /* d1 */ ldrsh r7, [r0, #12] /* d2 */ ldrsh r8, [r0, #14] /* d3 */ orrs r9, r2, r3 orrseq r9, r4, r5 orrseq r9, r6, r7 cmpeq r8, #0 bne 2f mov r1, r1, asl #15 bic r1, r1, #0x8000 orr r1, r1, r1, lsr #16 str r1, [r0], #4 str r1, [r0], #4 str r1, [r0], #4 str r1, [r0], #4 cmp r0, r12 blo 1b b 3f 2: mov r1, r1, asl #11 /* r1 = d0 = (block[0] << 11) + 2048 */ add r1, r1, #2048 add r1, r1, r3, asl #11 /* r1 = t0 = d0 + (block[2] << 11) */ sub r3, r1, r3, asl #12 /* r3 = t1 = d0 - (block[2] << 11) */ add r9, r2, r4 /* r9 = tmp = (d1+d3)*(1108/4) */ add r10, r9, r9, asl #2 add r10, r10, r9, asl #4 add r9, r10, r9, asl #8 add r10, r2, r2, asl #4 /* r2 = t2 = tmp + (d1*(1568/32)*8) */ add r2, r10, r2, asl #5 add r2, r9, r2, asl #3 add r10, r4, r4, asl #2 /* r4 = t3 = tmp - (d3*(3784/8)*2) */ rsb r10, r10, r4, asl #6 add r4, r4, r10, asl #3 sub r4, r9, r4, asl #1 /* t2 & t3 are 1/4 final value here */ add r1, r1, r2, asl #2 /* r1 = a0 = t0 + t2 */ sub r2, r1, r2, asl #3 /* r2 = a3 = t0 - t2 */ add r3, r3, r4, asl #2 /* r3 = a1 = t1 + t3 */ sub r4, r3, r4, asl #3 /* r4 = a2 = t1 - t3 */ add r9, r8, r5 /* r9 = tmp = 565*(d3 + d0) */ add r10, r9, r9, asl #4 add r10, r10, r10, asl #5 add r9, r10, r9, asl #2 add r10, r5, r5, asl #4 /* r5 = t0 = tmp + (((2276/4)*d0)*4) */ add r10, r10, r10, asl #5 add r5, r10, r5, asl #3 add r5, r9, r5, asl #2 add r10, r8, r8, asl #2 /* r8 = t1 = tmp - (((3406/2)*d3)*2) */ add r10, r10, r10, asl #4 add r10, r10, r8, asl #7 rsb r8, r8, r10, asl #3 sub r8, r9, r8, asl #1 add r9, r6, r7 /* r9 = tmp = (2408/8)*(d1 + d2) */ add r10, r9, r9, asl #3 add r10, r10, r10, asl #5 add r9, r10, r9, asl #2 add r10, r7, r7, asl #3 /* r7 = t2 = (tmp*8) - 799*d2 */ add r10, r10, r7, asl #4 rsb r7, r7, r10, asl #5 rsb r7, r7, r9, asl #3 sub r10, r6, r6, asl #4 /* r6 = t3 = (tmp*8) - 4017*d1 */ sub r10, r10, r6, asl #6 add r10, r10, r6, asl #12 add r6, r10, r6 rsb r6, r6, r9, asl #3 /* t0 = r5, t1 = r8, t2 = r7, t3 = r6*/ add r9, r5, r7 /* r9 = b0 = t0 + t2 */ add r10, r8, r6 /* r10 = b3 = t1 + t3 */ sub r5, r5, r7 /* t0 -= t2 */ sub r8, r8, r6 /* t1 -= t3 */ add r6, r5, r8 /* r6 = t0 + t1 */ sub r7, r5, r8 /* r7 = t0 - t1 */ add r11, r6, r6, asr #2 /* r6 = b1 = r6*(181/128) */ add r11, r11, r11, asr #5 add r6, r11, r6, asr #3 add r11, r7, r7, asr #2 /* r7 = b2 = r7*(181/128) */ add r11, r11, r11, asr #5 add r7, r11, r7, asr #3 /* r1 = a0, r3 = a1, r4 = a2, r2 = a3 */ /* r9 = b0, r6 = b1*2, r7 = b2*2, r10 = b3 */ add r5, r1, r9 /* block[0] = (a0 + b0) >> 12 */ mov r5, r5, asr #12 strh r5, [r0], #2 add r8, r3, r6, asr #1 /* block[1] = (a1 + b1) >> 12 */ mov r8, r8, asr #12 strh r8, [r0], #2 add r5, r4, r7, asr #1 /* block[2] = (a2 + b2) >> 12 */ mov r5, r5, asr #12 strh r5, [r0], #2 add r8, r2, r10 /* block[3] = (a3 + b3) >> 12 */ mov r8, r8, asr #12 strh r8, [r0], #2 sub r5, r2, r10 /* block[4] = (a3 - b3) >> 12 */ mov r5, r5, asr #12 strh r5, [r0], #2 sub r8, r4, r7, asr #1 /* block[5] = (a2 - b2) >> 12 */ mov r8, r8, asr #12 strh r8, [r0], #2 sub r5, r3, r6, asr #1 /* block[6] = (a1 - b1) >> 12 */ mov r5, r5, asr #12 strh r5, [r0], #2 sub r8, r1, r9 /* block[7] = (a0 - b0) >> 12 */ mov r8, r8, asr #12 strh r8, [r0], #2 cmp r0, r12 blo 1b 3: sub r0, r0, #128 add r12, r0, #16 4: ldrsh r1, [r0, #0*8] /* d0 */ ldrsh r2, [r0, #2*8] /* d1 */ ldrsh r3, [r0, #4*8] /* d2 */ ldrsh r4, [r0, #6*8] /* d3 */ ldrsh r5, [r0, #8*8] /* d0 */ ldrsh r6, [r0, #10*8] /* d1 */ ldrsh r7, [r0, #12*8] /* d2 */ ldrsh r8, [r0, #14*8] /* d3 */ mov r1, r1, asl #11 /* r1 = d0 = (block[0] << 11) + 2048 */ add r1, r1, #65536 add r1, r1, r3, asl #11 /* r1 = t0 = d0 + d2:(block[2] << 11) */ sub r3, r1, r3, asl #12 /* r3 = t1 = d0 - d2:(block[2] << 11) */ add r9, r2, r4 /* r9 = tmp = (d1+d3)*(1108/4) */ add r10, r9, r9, asl #2 add r10, r10, r9, asl #4 add r9, r10, r9, asl #8 add r11, r2, r2, asl #4 /* r2 = t2 = tmp + (d1*(1568/32)*8) */ add r2, r11, r2, asl #5 add r2, r9, r2, asl #3 add r10, r4, r4, asl #2 /* r4 = t3 = tmp - (d3*(3784/8)*2) */ rsb r10, r10, r4, asl #6 add r4, r4, r10, asl #3 sub r4, r9, r4, asl #1 /* t2 & t3 are 1/4 final value here */ add r1, r1, r2, asl #2 /* r1 = a0 = t0 + t2 */ sub r2, r1, r2, asl #3 /* r2 = a3 = t0 - t2 */ add r3, r3, r4, asl #2 /* r3 = a1 = t1 + t3 */ sub r4, r3, r4, asl #3 /* r4 = a2 = t1 - t3 */ add r9, r8, r5 /* r9 = tmp = 565*(d3 + d0) */ add r10, r9, r9, asl #4 add r10, r10, r10, asl #5 add r9, r10, r9, asl #2 add r10, r5, r5, asl #4 /* r5 = t0 = tmp + (((2276/4)*d0)*4) */ add r10, r10, r10, asl #5 add r5, r10, r5, asl #3 add r5, r9, r5, asl #2 add r10, r8, r8, asl #2 /* r8 = t1 = tmp - (((3406/2)*d3)*2) */ add r10, r10, r10, asl #4 add r10, r10, r8, asl #7 rsb r8, r8, r10, asl #3 sub r8, r9, r8, asl #1 add r9, r6, r7 /* r9 = tmp = (2408/8)*(d1 + d2) */ add r10, r9, r9, asl #3 add r10, r10, r10, asl #5 add r9, r10, r9, asl #2 add r10, r7, r7, asl #3 /* r7 = t2 = (tmp*8) - 799*d2 */ add r10, r10, r7, asl #4 rsb r7, r7, r10, asl #5 rsb r7, r7, r9, asl #3 sub r10, r6, r6, asl #4 /* r6 = t3 = (tmp*8) - 4017*d1 */ sub r10, r10, r6, asl #6 add r10, r10, r6, asl #12 add r6, r10, r6 rsb r6, r6, r9, asl #3 /* t0=r5, t1=r8, t2=r7, t3=r6*/ add r9, r5, r7 /* r9 = b0 = t0 + t2 */ add r10, r8, r6 /* r10 = b3 = t1 + t3 */ sub r5, r5, r7 /* t0 -= t2 */ sub r8, r8, r6 /* t1 -= t3 */ add r6, r5, r8 /* r6 = t0 + t1 */ sub r7, r5, r8 /* r7 = t0 - t1 */ add r11, r6, r6, asr #2 /* r6 = b1 = r5*(181/128) */ add r11, r11, r11, asr #5 add r6, r11, r6, asr #3 add r11, r7, r7, asr #2 /* r7 = b2 = r6*(181/128) */ add r11, r11, r11, asr #5 add r7, r11, r7, asr #3 /* r1 = a0, r3 = a1, r4 = a2, r2 = a3 */ /* r9 = b0, r6 = b1*2, r7 = b2*2, r10 = b3 */ add r5, r1, r9 /* block[0] = (a0 + b0) >> 17 */ mov r5, r5, asr #17 strh r5, [r0, #0*8] add r8, r3, r6, asr #1 /* block[1] = (a1 + b1) >> 17 */ mov r8, r8, asr #17 strh r8, [r0, #2*8] add r5, r4, r7, asr #1 /* block[2] = (a2 + b2) >> 17 */ mov r5, r5, asr #17 strh r5, [r0, #4*8] add r8, r2, r10 /* block[3] = (a3 + b3) >> 17 */ mov r8, r8, asr #17 strh r8, [r0, #6*8] sub r5, r2, r10 /* block[4] = (a3 - b3) >> 17 */ mov r5, r5, asr #17 strh r5, [r0, #8*8] sub r8, r4, r7, asr #1 /* block[5] = (a2 - b2) >> 17 */ mov r8, r8, asr #17 strh r8, [r0, #10*8] sub r5, r3, r6, asr #1 /* block[6] = (a1 - b1) >> 17 */ mov r5, r5, asr #17 strh r5, [r0, #12*8] sub r8, r1, r9 /* block[7] = (a0 - b0) >> 17 */ mov r8, r8, asr #17 strh r8, [r0, #14*8] add r0, r0, #2 cmp r0, r12 blo 4b sub r0, r0, #16 bx lr mpeg2_idct_copy: stmfd sp!, { r1-r2, r4-r11, lr } bl .idct ldmfd sp!, { r1-r2 } mov r11, #0 add r12, r0, #128 1: ldrsh r3, [r0, #0] ldrsh r4, [r0, #2] ldrsh r5, [r0, #4] ldrsh r6, [r0, #6] ldrsh r7, [r0, #8] ldrsh r8, [r0, #10] ldrsh r9, [r0, #12] ldrsh r10, [r0, #14] cmp r3, #255 mvnhi r3, r3, asr #31 strb r3, [r1, #0] str r11, [r0], #4 cmp r4, #255 mvnhi r4, r4, asr #31 strb r4, [r1, #1] cmp r5, #255 mvnhi r5, r5, asr #31 strb r5, [r1, #2] str r11, [r0], #4 cmp r6, #255 mvnhi r6, r6, asr #31 strb r6, [r1, #3] cmp r7, #255 mvnhi r7, r7, asr #31 strb r7, [r1, #4] str r11, [r0], #4 cmp r8, #255 mvnhi r8, r8, asr #31 strb r8, [r1, #5] cmp r9, #255 mvnhi r9, r9, asr #31 strb r9, [r1, #6] str r11, [r0], #4 cmp r10, #255 mvnhi r10, r10, asr #31 strb r10, [r1, #7] add r1, r1, r2 cmp r0, r12 blo 1b ldmpc regs=r4-r11 mpeg2_idct_add: cmp r0, #129 mov r0, r1 ldrsheq r1, [r0, #0] bne 1f and r1, r1, #0x70 cmp r1, #0x40 bne 3f 1: stmfd sp!, { r2-r11, lr } bl .idct ldmfd sp!, { r1-r2 } mov r11, #0 add r12, r0, #128 2: ldrb r3, [r1, #0] ldrb r4, [r1, #1] ldrb r5, [r1, #2] ldrb r6, [r1, #3] ldrsh r7, [r0, #0] ldrsh r8, [r0, #2] ldrsh r9, [r0, #4] ldrsh r10, [r0, #6] add r7, r7, r3 ldrb r3, [r1, #4] cmp r7, #255 mvnhi r7, r7, asr #31 strb r7, [r1, #0] ldrsh r7, [r0, #8] add r8, r8, r4 ldrb r4, [r1, #5] cmp r8, #255 mvnhi r8, r8, asr #31 strb r8, [r1, #1] ldrsh r8, [r0, #10] add r9, r9, r5 ldrb r5, [r1, #6] cmp r9, #255 mvnhi r9, r9, asr #31 strb r9, [r1, #2] ldrsh r9, [r0, #12] add r10, r10, r6 ldrb r6, [r1, #7] cmp r10, #255 mvnhi r10, r10, asr #31 strb r10, [r1, #3] ldrsh r10, [r0, #14] str r11, [r0], #4 add r7, r7, r3 cmp r7, #255 mvnhi r7, r7, asr #31 strb r7, [r1, #4] str r11, [r0], #4 add r8, r8, r4 cmp r8, #255 mvnhi r8, r8, asr #31 strb r8, [r1, #5] str r11, [r0], #4 add r9, r9, r5 cmp r9, #255 mvnhi r9, r9, asr #31 strb r9, [r1, #6] add r10, r10, r6 cmp r10, #255 mvnhi r10, r10, asr #31 strb r10, [r1, #7] str r11, [r0], #4 add r1, r1, r2 cmp r0, r12 blo 2b ldmpc regs=r4-r11 3: stmfd sp!, { r4-r5, lr } ldrsh r1, [r0, #0] /* r1 = block[0] */ mov r4, #0 strh r4, [r0, #0] /* block[0] = 0 */ strh r4, [r0, #126] /* block[63] = 0 */ add r1, r1, #64 /* r1 = DC << 7 */ add r0, r2, r3, asl #3 4: ldrb r4, [r2, #0] ldrb r5, [r2, #1] ldrb r12, [r2, #2] ldrb lr, [r2, #3] add r4, r4, r1, asr #7 cmp r4, #255 mvnhi r4, r4, asr #31 strb r4, [r2, #0] add r5, r5, r1, asr #7 cmp r5, #255 mvnhi r5, r5, asr #31 strb r5, [r2, #1] add r12, r12, r1, asr #7 cmp r12, #255 mvnhi r12, r12, asr #31 strb r12, [r2, #2] add lr, lr, r1, asr #7 cmp lr, #255 mvnhi lr, lr, asr #31 strb lr, [r2, #3] ldrb r4, [r2, #4] ldrb r5, [r2, #5] ldrb r12, [r2, #6] ldrb lr, [r2, #7] add r4, r4, r1, asr #7 cmp r4, #255 mvnhi r4, r4, asr #31 strb r4, [r2, #4] add r5, r5, r1, asr #7 cmp r5, #255 mvnhi r5, r5, asr #31 strb r5, [r2, #5] add r12, r12, r1, asr #7 cmp r12, #255 mvnhi r12, r12, asr #31 strb r12, [r2, #6] add lr, lr, r1, asr #7 cmp lr, #255 mvnhi lr, lr, asr #31 strb lr, [r2, #7] add r2, r2, r3 cmp r2, r0 blo 4b ldmpc regs=r4-r5