From 9d3d925295112a0080bc1d70fad170db9e1af2a9 Mon Sep 17 00:00:00 2001 From: Solomon Peachy Date: Thu, 13 Oct 2022 11:04:12 -0400 Subject: Revert "RFC: Get rid of mpegplayer plugin" This reverts commit d25d24812e8120c0eb133a412287ac030eb185c9. Change-Id: I1563223e343fb1e2eda72a45823b38350025ff93 --- apps/plugins/mpegplayer/libmpeg2/idct.c | 274 ++++++++++++++++++++++++++++++++ 1 file changed, 274 insertions(+) create mode 100644 apps/plugins/mpegplayer/libmpeg2/idct.c (limited to 'apps/plugins/mpegplayer/libmpeg2/idct.c') diff --git a/apps/plugins/mpegplayer/libmpeg2/idct.c b/apps/plugins/mpegplayer/libmpeg2/idct.c new file mode 100644 index 0000000000..7f0b9a3c12 --- /dev/null +++ b/apps/plugins/mpegplayer/libmpeg2/idct.c @@ -0,0 +1,274 @@ +/* + * idct.c + * Copyright (C) 2000-2003 Michel Lespinasse + * Copyright (C) 1999-2000 Aaron Holtzman + * + * 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 + * + * $Id$ + * libmpeg2 sync history: + * 2008-07-01 - CVS revision 1.36 + */ + +#include "plugin.h" + +#include "mpeg2dec_config.h" + +#include "mpeg2.h" +#include "attributes.h" +#include "mpeg2_internal.h" + +#if defined(CPU_COLDFIRE) || defined (CPU_ARM) +#define IDCT_ASM +#endif + +#ifndef IDCT_ASM + +#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) */ + +/* + * 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. + */ +#define CLIP(i) \ + ({ typeof (i) _i = (i); \ + if ((_i & 0xff) != _i) \ + _i = ~(_i >> (8*sizeof(_i) - 1)); \ + _i; }) + +#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 + +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; +} + +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; +} + +void mpeg2_idct_copy (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); +} + +void mpeg2_idct_add (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 = (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); + } +} + +#endif /* IDCT_ASM */ + +void mpeg2_idct_init (void) +{ + int i, j; + + for (i = 0; i < 64; i++) + { + j = default_mpeg2_scan_norm[i]; + mpeg2_scan_norm[i] = ((j & 0x36) >> 1) | ((j & 0x09) << 2); + + j = default_mpeg2_scan_alt[i]; + mpeg2_scan_alt[i] = ((j & 0x36) >> 1) | ((j & 0x09) << 2); + } +} -- cgit v1.2.3