mirror of
https://github.com/FFmpeg/FFmpeg.git
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0c15a9aa7e
The code represents a considerable maintenance burden and it is not clear that it gives a noticeable benefit to outweigh this after 10 years of improvements in compiler technology since its creation.
108 lines
3.3 KiB
C
108 lines
3.3 KiB
C
/*
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* sh4 dsputil
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*
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* Copyright (c) 2003 BERO <bero@geocities.co.jp>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/attributes.h"
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#include "libavcodec/avcodec.h"
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#include "libavcodec/dsputil.h"
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#include "dsputil_sh4.h"
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#include "sh4.h"
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static void memzero_align8(void *dst,size_t size)
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{
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int fpscr;
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fp_single_enter(fpscr);
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dst = (char *)dst + size;
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size /= 32;
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__asm__ volatile (
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" fldi0 fr0\n"
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" fldi0 fr1\n"
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" fschg\n" // double
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"1: \n" \
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" dt %1\n"
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" fmov dr0,@-%0\n"
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" fmov dr0,@-%0\n"
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" fmov dr0,@-%0\n"
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" bf.s 1b\n"
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" fmov dr0,@-%0\n"
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" fschg" //back to single
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: "+r"(dst),"+r"(size) :: "memory" );
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fp_single_leave(fpscr);
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}
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static void clear_blocks_sh4(int16_t *blocks)
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{
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memzero_align8(blocks,sizeof(int16_t)*6*64);
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}
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static void idct_put(uint8_t *dest, int line_size, int16_t *block)
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{
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int i;
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const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
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ff_idct_sh4(block);
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for(i=0;i<8;i++) {
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dest[0] = cm[block[0]];
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dest[1] = cm[block[1]];
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dest[2] = cm[block[2]];
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dest[3] = cm[block[3]];
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dest[4] = cm[block[4]];
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dest[5] = cm[block[5]];
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dest[6] = cm[block[6]];
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dest[7] = cm[block[7]];
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dest+=line_size;
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block+=8;
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}
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}
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static void idct_add(uint8_t *dest, int line_size, int16_t *block)
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{
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int i;
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const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
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ff_idct_sh4(block);
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for(i=0;i<8;i++) {
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dest[0] = cm[dest[0]+block[0]];
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dest[1] = cm[dest[1]+block[1]];
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dest[2] = cm[dest[2]+block[2]];
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dest[3] = cm[dest[3]+block[3]];
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dest[4] = cm[dest[4]+block[4]];
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dest[5] = cm[dest[5]+block[5]];
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dest[6] = cm[dest[6]+block[6]];
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dest[7] = cm[dest[7]+block[7]];
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dest+=line_size;
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block+=8;
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}
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}
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av_cold void ff_dsputil_init_sh4(DSPContext *c, AVCodecContext *avctx)
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{
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const int idct_algo= avctx->idct_algo;
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const int high_bit_depth = avctx->bits_per_raw_sample > 8;
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if (!high_bit_depth)
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c->clear_blocks = clear_blocks_sh4;
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if (avctx->bits_per_raw_sample <= 8 &&
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(idct_algo==FF_IDCT_AUTO || idct_algo==FF_IDCT_SH4)) {
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c->idct_put = idct_put;
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c->idct_add = idct_add;
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c->idct = ff_idct_sh4;
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c->idct_permutation_type= FF_NO_IDCT_PERM;
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}
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}
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