diff options
Diffstat (limited to 'libavcodec/alpha/idctdsp_alpha.c')
| -rw-r--r-- | libavcodec/alpha/idctdsp_alpha.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/libavcodec/alpha/idctdsp_alpha.c b/libavcodec/alpha/idctdsp_alpha.c new file mode 100644 index 0000000000..1050697fdd --- /dev/null +++ b/libavcodec/alpha/idctdsp_alpha.c @@ -0,0 +1,127 @@ +/* + * Copyright (c) 2002 Falk Hueffner <falk@debian.org> + * + * This file is part of FFmpeg. + * + * FFmpeg 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. + * + * FFmpeg 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 FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "libavutil/attributes.h" +#include "libavcodec/idctdsp.h" +#include "idctdsp_alpha.h" +#include "asm.h" + +void put_pixels_clamped_mvi_asm(const int16_t *block, uint8_t *pixels, + int line_size); +void add_pixels_clamped_mvi_asm(const int16_t *block, uint8_t *pixels, + int line_size); + +void (*put_pixels_clamped_axp_p)(const int16_t *block, uint8_t *pixels, + int line_size); +void (*add_pixels_clamped_axp_p)(const int16_t *block, uint8_t *pixels, + int line_size); + +#if 0 +/* These functions were the base for the optimized assembler routines, + and remain here for documentation purposes. */ +static void put_pixels_clamped_mvi(const int16_t *block, uint8_t *pixels, + ptrdiff_t line_size) +{ + int i = 8; + uint64_t clampmask = zap(-1, 0xaa); /* 0x00ff00ff00ff00ff */ + + do { + uint64_t shorts0, shorts1; + + shorts0 = ldq(block); + shorts0 = maxsw4(shorts0, 0); + shorts0 = minsw4(shorts0, clampmask); + stl(pkwb(shorts0), pixels); + + shorts1 = ldq(block + 4); + shorts1 = maxsw4(shorts1, 0); + shorts1 = minsw4(shorts1, clampmask); + stl(pkwb(shorts1), pixels + 4); + + pixels += line_size; + block += 8; + } while (--i); +} + +void add_pixels_clamped_mvi(const int16_t *block, uint8_t *pixels, + ptrdiff_t line_size) +{ + int h = 8; + /* Keep this function a leaf function by generating the constants + manually (mainly for the hack value ;-). */ + uint64_t clampmask = zap(-1, 0xaa); /* 0x00ff00ff00ff00ff */ + uint64_t signmask = zap(-1, 0x33); + signmask ^= signmask >> 1; /* 0x8000800080008000 */ + + do { + uint64_t shorts0, pix0, signs0; + uint64_t shorts1, pix1, signs1; + + shorts0 = ldq(block); + shorts1 = ldq(block + 4); + + pix0 = unpkbw(ldl(pixels)); + /* Signed subword add (MMX paddw). */ + signs0 = shorts0 & signmask; + shorts0 &= ~signmask; + shorts0 += pix0; + shorts0 ^= signs0; + /* Clamp. */ + shorts0 = maxsw4(shorts0, 0); + shorts0 = minsw4(shorts0, clampmask); + + /* Next 4. */ + pix1 = unpkbw(ldl(pixels + 4)); + signs1 = shorts1 & signmask; + shorts1 &= ~signmask; + shorts1 += pix1; + shorts1 ^= signs1; + shorts1 = maxsw4(shorts1, 0); + shorts1 = minsw4(shorts1, clampmask); + + stl(pkwb(shorts0), pixels); + stl(pkwb(shorts1), pixels + 4); + + pixels += line_size; + block += 8; + } while (--h); +} +#endif + +av_cold void ff_idctdsp_init_alpha(IDCTDSPContext *c, AVCodecContext *avctx, + unsigned high_bit_depth) +{ + /* amask clears all bits that correspond to present features. */ + if (amask(AMASK_MVI) == 0) { + c->put_pixels_clamped = put_pixels_clamped_mvi_asm; + c->add_pixels_clamped = add_pixels_clamped_mvi_asm; + } + + put_pixels_clamped_axp_p = c->put_pixels_clamped; + add_pixels_clamped_axp_p = c->add_pixels_clamped; + + if (!high_bit_depth && !avctx->lowres && + (avctx->idct_algo == FF_IDCT_AUTO || + avctx->idct_algo == FF_IDCT_SIMPLEALPHA)) { + c->idct_put = ff_simple_idct_put_axp; + c->idct_add = ff_simple_idct_add_axp; + c->idct = ff_simple_idct_axp; + } +} |