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- Untitled
- Thursday, August 24th, 2006 at 5:03:13pm MDT
- /*
- * 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"
- #define W1 2841 /* 2048 * sqrt (2) * cos (1 * pi / 16) */
- #define W2 2676 /* 2048 * sqrt (2) * cos (2 * pi / 16) */
- #define W3 2408 /* 2048 * sqrt (2) * cos (3 * pi / 16) */
- #define W5 1609 /* 2048 * sqrt (2) * cos (5 * pi / 16) */
- #define W6 1108 /* 2048 * sqrt (2) * cos (6 * pi / 16) */
- #define W7 565 /* 2048 * sqrt (2) * cos (7 * pi / 16) */
- #define SC(x) #x
- #define WA 1448 //=cos(pi/4) 2048*cos(4pi/16) 0,707106781
- #define WB 2009 //=cos(pi/16) 2048*cos(pi/16) 0,98078528
- #define WC 1892 //=cos(pi/8) 2048*cos(2pi/16) 0,923879533
- #define WD 1703 //=cos(3pi/16) 2048*cos(3pi/16) 0,831469612
- #define WE 1448 //=sin(pi/4) 2048*sin(4pi/16) 0,707106781
- #define WF 1138 //=sin(3pi/16) 2048*sin(3pi/16) 0,555570233
- #define WG 784 //=sin(pi/8) 2048*sin(2pi/16) 0,382683432
- #define WH 400 //=sin(pi/16) 2048*sin(pi/16) 0,195090322
- /* the two matrix */
- /*
- static const int mat_coef_1[] ICONST_ATTR =
- {WA, WC, WE, WG,
- WA, WG, -WE, -WC,
- WA, -WG, -WE, WC,
- WA, -WC, WE, -WG};
- static const int mat_coef_2[] ICONST_ATTR =
- {WB, WD, WF, WH,
- WD, -WH, -WB, -WF,
- WF, -WB, WH, WD,
- WH, -WF, WD, -WB};
- */
- /* optimised for incrementation */
- /*
- static const int mat_coef[] ICONST_ATTR =
- {WA, WC, WE, WG, WB, WD, WF, WH,
- WA, WG, -WE, -WC, WD, -WH, -WB, -WF,
- WA, -WG, -WE, WC, WF, -WB, WH, WD,
- WA, -WC, WE, -WG, WH, -WF, WD, -WB};
- */
- /* takes more space but optimised for incrementation
- static const int16_t mat_coef[] ICONST_ATTR =
- {WA, WC, WE, WG, WB, WD, WF, WH, WA, WC, WE, WG, WB, WD, WF, WH,
- WA, WG, -WE, -WC, WD, -WH, -WB, -WF, WA, WG, -WE, -WC, WD, -WH, -WB, -WF,
- WA, -WG, -WE, WC, WF, -WB, WH, WD, WA, -WG, -WE, WC, WF, -WB, WH, WD,
- WA, -WC, WE, -WG, WH, -WF, WD, -WB, WA, -WC, WE, -WG, WH, -WF, WD, -WB};
- */
- /* consecutive */
- static const int mat_coef[] ICONST_ATTR =
- {WA, WC, WE, WG,
- WA, WG, -WE, -WC,
- WA, -WG, -WE, WC,
- WA, -WC, WE, -WG,
- WB, WD, WF, WH,
- WD, -WH, -WB, -WF,
- WF, -WB, WH, WD,
- WH, -WF, WD, -WB};
- /* 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.
- */
- #ifdef CPU_COLDFIRE
- static inline unsigned CLIP(int value)
- {
- asm ( /* Note: Uses knowledge that only the low byte of the result is used */
- "cmp.l #255,%[v] \n" /* overflow? */
- "bls.b 1f \n" /* no: return value */
- "spl.b %[v] \n" /* yes: set low byte to appropriate boundary */
- "1: \n"
- : /* outputs */
- [v]"+d"(value)
- );
- return value;
- }
- #elif defined CPU_ARM
- static inline unsigned CLIP(int value)
- {
- asm ( /* Note: Uses knowledge that only the low byte of the result is used */
- "cmp %[v], #255 \n"
- "mvnhi %[v], %[v], asr #31 \n"
- : /* outputs */
- [v]"+r"(value)
- );
- return value;
- }
- #else
- uint8_t mpeg2_clip[3840 * 2 + 256] IBSS_ATTR;
- #define CLIP(i) ((mpeg2_clip + 3840)[i])
- #endif
- #ifdef CPU_COLDFIRE
- #define BUTTERFLY(t0,t1,W0,W1,d0,d1) \
- asm( \
- "move.l #"SC(W0)", %%d0 \n\t" \
- "move.l #"SC(W1)", %%d1 \n\t" \
- "move.l #0xFFFFFF80,%%macsr \n\t" \
- "mac.l %%d0, %[e], %%acc0 \n\t" \
- "mac.l %%d1, %[f], %%acc0 \n\t" \
- "movclr.l %%acc0, %[a] \n\t" \
- "mac.l %%d0, %[f], %%acc0 \n\t" \
- "msac.l %%d1, %[e], %%acc0 \n\t" \
- "movclr.l %%acc0, %[b] \n\t" \
- : [a]"+d"(t0),[b]"+d"(t1) \
- : [e]"d"(d0),[f]"d"(d1) \
- : "%d0","%d1" \
- )
- #define BUTTERFLY_OK(t0,t1,W0,W1,d0,d1) \
- asm( \
- "move.l #"SC(W0)", %%d0 \n\t" \
- "move.l #"SC(W1)", %%d1 \n\t" \
- "move.l %[e], %%d2 \n\t" \
- "mulu.l %%d0, %%d2 \n\t" \
- "move.l %[f], %[a] \n\t" \
- "mulu.l %%d1, %[a] \n\t" \
- "add.l %%d2,%[a] \n\t" \
- "move.l %[e], %%d2 \n\t" \
- "mulu.l %%d1, %%d2 \n\t" \
- "move.l %[f], %[b] \n\t" \
- "mulu.l %%d0, %[b] \n\t" \
- "sub.l %%d2,%[b] \n\t" \
- : [a]"+d"(t0),[b]"+d"(t1) \
- : [e]"d"(d0),[f]"d"(d1) \
- : "%d0","%d1","%d2" \
- )
- #define BUTTERFLY__(t0,t1,W0,W1,d0,d1) \
- asm( \
- "move.l #"SC(W0)", %%d0 \n\t" \
- "move.l #"SC(W1)", %%d1 \n\t" \
- "move.l #0xFFFFFF80,%%macsr \n\t" \
- "mac.l %%d0, %[e], %%acc0 \n\t" \
- "mac.l %%d1, %[f], %%acc0 \n\t" \
- "movclr.l %%acc0, %[a] \n\t" \
- "mac.l %%d0, %[f], %%acc0 \n\t" \
- "msac.l %%d1, %[e], %%acc0 \n\t" \
- "movclr.l %%acc0, %[b] \n\t" \
- : [a]"+d"(t0),[b]"+d"(t1) \
- : [e]"d"(d0),[f]"d"(d1) \
- : "%d0","%d1" \
- )
- #else
- #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
- #endif
- #ifdef CPU_COLDFIRE
- static inline void idct_row (int16_t * const block)
- {
- asm volatile(
- "move.l #0xFFFFFF80,%%macsr \n\t"
- /* load the row */
- "move.l (%[block]), %%d0 \n\t"
- "move.l (1,%[block]), %%d1 \n\t"
- "move.l (2,%[block]), %%d2 \n\t"
- "move.l (3,%[block]), %%d3 \n\t"
- /* matrix start */
- "move.l %[mat_coef], %%a0 \n\t"
- "move.l (%%a0), %%a1 \n\t"
- "lea.l (1,%%a0), %%a0 \n\t"
- /* clear the accs */
- "move.l #0,%%acc0 \n\t"
- "move.l #0,%%acc1 \n\t"
- "move.l #0,%%acc2 \n\t"
- "move.l #0,%%acc3 \n\t"
- /* compute second matrix * P[1],P[3],P[5],P[7]*/
- "mac.w %%d0l, %%a1u, %%acc0 \n\t"
- "mac.w %%d1l, %%a1l, (%%a0)+, %%a1, %%acc0 \n\t"
- "mac.w %%d2l, %%a1u, %%acc0 \n\t"
- "mac.w %%d3l, %%a1l, (%%a0)+, %%a1, %%acc0 \n\t"
- "mac.w %%d0l, %%a1u, %%acc1 \n\t"
- "mac.w %%d1l, %%a1l, (%%a0)+, %%a1, %%acc1 \n\t"
- "mac.w %%d2l, %%a1u, %%acc1 \n\t"
- "mac.w %%d3l, %%a1l, (%%a0)+, %%a1, %%acc1 \n\t"
- "mac.w %%d0l, %%a1u, %%acc2 \n\t"
- "mac.w %%d1l, %%a1l, (%%a0)+, %%a1,%%acc2 \n\t"
- "mac.w %%d2l, %%a1u, %%acc2 \n\t"
- "mac.w %%d3l, %%a1l, (%%a0)+, %%a1, %%acc2 \n\t"
- "mac.w %%d0l, %%a1u, %%acc3 \n\t"
- "mac.w %%d1l, %%a1l, (%%a0)+, %%a1,%%acc3 \n\t"
- "mac.w %%d2l, %%a1u, %%acc3 \n\t"
- "mac.w %%d3l, %%a1l, (%%a0)+, %%a1, %%acc3 \n\t"
- /* save second matrix row */
- "movclr.l %%acc0, %%d4 \n\t"
- "movclr.l %%acc1, %%d5 \n\t"
- "movclr.l %%acc2, %%d6 \n\t"
- "movclr.l %%acc3, %%d7 \n\t"
- /* compute first matrix * P[0],P[2],P[4],P[6]*/
- "mac.w %%d0u, %%a1u, %%acc0 \n\t"
- "mac.w %%d1u, %%a1l, (%%a0)+, %%a1,%%acc0 \n\t"
- "mac.w %%d2u, %%a1u, %%acc0 \n\t"
- "mac.w %%d3u, %%a1l, (%%a0)+, %%a1,%%acc0 \n\t"
- "mac.w %%d0u, %%a1u, %%acc1 \n\t"
- "mac.w %%d1u, %%a1l,(%%a0)+, %%a1, %%acc1 \n\t"
- "mac.w %%d2u, %%a1u, %%acc1 \n\t"
- "mac.w %%d3u, %%a1l,(%%a0)+, %%a1, %%acc1 \n\t"
- "mac.w %%d0u, %%a1u, %%acc2 \n\t"
- "mac.w %%d1u, %%a1l, (%%a0)+, %%a1,%%acc2 \n\t"
- "mac.w %%d2u, %%a1u, %%acc2 \n\t"
- "mac.w %%d3u, %%a1l,(%%a0)+, %%a1, %%acc2 \n\t"
- "mac.w %%d0u, %%a1u, %%acc3 \n\t"
- "mac.w %%d1u, %%a1l, (%%a0)+, %%a1, %%acc3 \n\t"
- "mac.w %%d2u, %%a1u, %%acc3 \n\t"
- "mac.w %%d3u, %%a1l, (%%a0)+, %%a1, %%acc3 \n\t"
- /* right shift value */
- "movq.l #11, %%d1 \n\t"
- /* mat 1 + mat 2 */
- "move.l %%acc0, %%d0 \n\t"
- "add.l %%d4,%%d0 \n\t"
- "asr.l %%d1, %%d0 \n\t"
- "move.w %%d0,(%[block]) \n\t"
- "move.l %%acc1, %%d0 \n\t"
- "add.l %%d5,%%d0 \n\t"
- "asr.l %%d1, %%d0 \n\t"
- "move.w %%d0,(2,%[block]) \n\t"
- "move.l %%acc2, %%d0 \n\t"
- "add.l %%d6,%%d0 \n\t"
- "asr.l %%d1, %%d0 \n\t"
- "move.w %%d0,(4,%[block]) \n\t"
- "move.l %%acc1, %%d0 \n\t"
- "add.l %%d7,%%d0 \n\t"
- "asr.l %%d1, %%d0 \n\t"
- "move.w %%d0,(6,%[block]) \n\t"
- /* mat 1 - mat2*/
- "movclr.l %%acc0, %%d0 \n\t"
- "sub.l %%d4,%%d0 \n\t"
- "asr.l %%d1, %%d0 \n\t"
- "move.w %%d0,(1,%[block]) \n\t"
- "movclr.l %%acc1, %%d0 \n\t"
- "sub.l %%d5,%%d0 \n\t"
- "asr.l %%d1, %%d0 \n\t"
- "move.w %%d0,(3,%[block]) \n\t"
- "movclr.l %%acc2, %%d0 \n\t"
- "sub.l %%d6,%%d0 \n\t"
- "asr.l %%d1, %%d0 \n\t"
- "move.w %%d0,(5,%[block]) \n\t"
- "movclr.l %%acc1, %%d0 \n\t"
- "sub.l %%d7,%%d0 \n\t"
- "asr.l %%d1, %%d0 \n\t"
- "move.w %%d0,(7,%[block]) \n\t"
- :
- : [mat_coef]"a"(mat_coef),[block]"a"(block)
- : "%a0","%a1","%d0","%d1","%d2","%d3","%d4","%d5","%d6","%d7"
- );
- }
- #else
- static inline void idct_row (int16_t * const block)
- {
- int d0, d1, d2, d3;
- int a0, a1, a2, a3, b0, b1, b2, b3;
- int t0, t1, t2, t3;
- /* shortcut */
- if (likely (!(block[1] | ((int32_t *)block)[1] | ((int32_t *)block)[2] |
- ((int32_t *)block)[3]))) {
- uint32_t tmp = (uint16_t) (block[0] >> 1);
- tmp |= tmp << 16;
- ((int32_t *)block)[0] = tmp;
- ((int32_t *)block)[1] = tmp;
- ((int32_t *)block)[2] = tmp;
- ((int32_t *)block)[3] = tmp;
- return;
- }
- d0 = (block[0] << 11) + 2048;
- d1 = block[1];
- d2 = block[2] << 11;
- d3 = block[3];
- t0 = d0 + d2;
- t1 = d0 - d2;
- BUTTERFLY (t2, t3, W6, W2, d3, d1);
- a0 = t0 + t2;
- a1 = t1 + t3;
- a2 = t1 - t3;
- a3 = t0 - t2;
- d0 = block[4];
- d1 = block[5];
- d2 = block[6];
- d3 = block[7];
- BUTTERFLY (t0, t1, W7, W1, d3, d0);
- BUTTERFLY (t2, t3, W3, W5, d1, d2);
- b0 = t0 + t2;
- b3 = t1 + t3;
- t0 -= t2;
- t1 -= t3;
- b1 = ((t0 + t1) >> 8) * 181;
- b2 = ((t0 - t1) >> 8) * 181;
- block[0] = (a0 + b0) >> 12;
- block[1] = (a1 + b1) >> 12;
- block[2] = (a2 + b2) >> 12;
- block[3] = (a3 + b3) >> 12;
- block[4] = (a3 - b3) >> 12;
- block[5] = (a2 - b2) >> 12;
- block[6] = (a1 - b1) >> 12;
- block[7] = (a0 - b0) >> 12;
- }
- #endif
- static inline void idct_col (int16_t * const block)
- {
- int d0, d1, d2, d3;
- int a0, a1, a2, a3, b0, b1, b2, b3;
- int t0, t1, t2, t3;
- d0 = (block[8*0] << 11) + 65536;
- d1 = block[8*1];
- d2 = block[8*2] << 11;
- d3 = block[8*3];
- t0 = d0 + d2;
- t1 = d0 - d2;
- BUTTERFLY (t2, t3, W6, W2, d3, d1);
- a0 = t0 + t2;
- a1 = t1 + t3;
- a2 = t1 - t3;
- a3 = t0 - t2;
- d0 = block[8*4];
- d1 = block[8*5];
- d2 = block[8*6];
- d3 = block[8*7];
- BUTTERFLY (t0, t1, W7, W1, d3, d0);
- BUTTERFLY (t2, t3, W3, W5, d1, d2);
- b0 = t0 + t2;
- b3 = t1 + t3;
- t0 -= t2;
- t1 -= t3;
- b1 = ((t0 + t1) >> 8) * 181;
- b2 = ((t0 - t1) >> 8) * 181;
- block[8*0] = (a0 + b0) >> 17;
- block[8*1] = (a1 + b1) >> 17;
- block[8*2] = (a2 + b2) >> 17;
- block[8*3] = (a3 + b3) >> 17;
- block[8*4] = (a3 - b3) >> 17;
- block[8*5] = (a2 - b2) >> 17;
- block[8*6] = (a1 - b1) >> 17;
- block[8*7] = (a0 - b0) >> 17;
- }
- static void mpeg2_idct_copy_c (int16_t * block, uint8_t * dest,
- const int stride)
- {
- int i;
- for (i = 0; i < 8; i++)
- idct_row (block + 8 * i);
- for (i = 0; i < 8; i++)
- idct_col (block + i);
- do {
- dest[0] = CLIP (block[0]);
- dest[1] = CLIP (block[1]);
- dest[2] = CLIP (block[2]);
- dest[3] = CLIP (block[3]);
- dest[4] = CLIP (block[4]);
- dest[5] = CLIP (block[5]);
- dest[6] = CLIP (block[6]);
- dest[7] = CLIP (block[7]);
- ((int32_t *)block)[0] = 0; ((int32_t *)block)[1] = 0;
- ((int32_t *)block)[2] = 0; ((int32_t *)block)[3] = 0;
- dest += stride;
- block += 8;
- } while (--i);
- }
- static void mpeg2_idct_add_c (const int last, int16_t * block,
- uint8_t * dest, const int stride)
- {
- int i;
- if (last != 129 || (block[0] & (7 << 4)) == (4 << 4)) {
- for (i = 0; i < 8; i++)
- idct_row (block + 8 * i);
- for (i = 0; i < 8; i++)
- idct_col (block + i);
- do {
- dest[0] = CLIP (block[0] + dest[0]);
- dest[1] = CLIP (block[1] + dest[1]);
- dest[2] = CLIP (block[2] + dest[2]);
- dest[3] = CLIP (block[3] + dest[3]);
- dest[4] = CLIP (block[4] + dest[4]);
- dest[5] = CLIP (block[5] + dest[5]);
- dest[6] = CLIP (block[6] + dest[6]);
- dest[7] = CLIP (block[7] + dest[7]);
- ((int32_t *)block)[0] = 0; ((int32_t *)block)[1] = 0;
- ((int32_t *)block)[2] = 0; ((int32_t *)block)[3] = 0;
- dest += stride;
- block += 8;
- } while (--i);
- } else {
- int DC;
- DC = (block[0] + 64) >> 7;
- block[0] = block[63] = 0;
- i = 8;
- do {
- dest[0] = CLIP (DC + dest[0]);
- dest[1] = CLIP (DC + dest[1]);
- dest[2] = CLIP (DC + dest[2]);
- dest[3] = CLIP (DC + dest[3]);
- dest[4] = CLIP (DC + dest[4]);
- dest[5] = CLIP (DC + dest[5]);
- dest[6] = CLIP (DC + dest[6]);
- dest[7] = CLIP (DC + dest[7]);
- dest += stride;
- } while (--i);
- }
- }
- void mpeg2_idct_init (uint32_t accel)
- {
- (void)accel;
- #ifdef ARCH_X86
- if (accel & MPEG2_ACCEL_X86_MMXEXT) {
- mpeg2_idct_copy = mpeg2_idct_copy_mmxext;
- mpeg2_idct_add = mpeg2_idct_add_mmxext;
- mpeg2_idct_mmx_init ();
- } else if (accel & MPEG2_ACCEL_X86_MMX) {
- mpeg2_idct_copy = mpeg2_idct_copy_mmx;
- mpeg2_idct_add = mpeg2_idct_add_mmx;
- mpeg2_idct_mmx_init ();
- } else
- #endif
- #ifdef ARCH_PPC
- if (accel & MPEG2_ACCEL_PPC_ALTIVEC) {
- mpeg2_idct_copy = mpeg2_idct_copy_altivec;
- mpeg2_idct_add = mpeg2_idct_add_altivec;
- mpeg2_idct_altivec_init ();
- } else
- #endif
- #ifdef ARCH_ALPHA
- if (accel & MPEG2_ACCEL_ALPHA_MVI) {
- mpeg2_idct_copy = mpeg2_idct_copy_mvi;
- mpeg2_idct_add = mpeg2_idct_add_mvi;
- mpeg2_idct_alpha_init ();
- } else if (accel & MPEG2_ACCEL_ALPHA) {
- int i;
- mpeg2_idct_copy = mpeg2_idct_copy_alpha;
- mpeg2_idct_add = mpeg2_idct_add_alpha;
- mpeg2_idct_alpha_init ();
- for (i = -3840; i < 3840 + 256; i++)
- CLIP(i) = (i < 0) ? 0 : ((i > 255) ? 255 : i);
- } else
- #endif
- {
- 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;
- #if !defined(CPU_COLDFIRE) && !defined(CPU_ARM)
- for (i = -3840; i < 3840 + 256; i++)
- CLIP(i) = (i < 0) ? 0 : ((i > 255) ? 255 : i);
- #endif
- 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);
- }
- }
- }
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