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libavcodec/sh4/dsputil_sh4.c

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00001 /*
00002  *  sh4 dsputil
00003  *
00004  * Copyright (c) 2003 BERO <bero@geocities.co.jp>
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00023 #include "libavcodec/avcodec.h"
00024 #include "libavcodec/dsputil.h"
00025 #include "dsputil_sh4.h"
00026 #include "sh4.h"
00027 
00028 static void memzero_align8(void *dst,size_t size)
00029 {
00030         int fpscr;
00031         fp_single_enter(fpscr);
00032         dst = (char *)dst + size;
00033         size /= 32;
00034         __asm__ volatile (
00035         " fldi0 fr0\n"
00036         " fldi0 fr1\n"
00037         " fschg\n"  // double
00038         "1: \n" \
00039         " dt %1\n"
00040         " fmov  dr0,@-%0\n"
00041         " fmov  dr0,@-%0\n"
00042         " fmov  dr0,@-%0\n"
00043         " bf.s 1b\n"
00044         " fmov  dr0,@-%0\n"
00045         " fschg" //back to single
00046         : "+r"(dst),"+r"(size) :: "memory" );
00047         fp_single_leave(fpscr);
00048 }
00049 
00050 static void clear_blocks_sh4(DCTELEM *blocks)
00051 {
00052         memzero_align8(blocks,sizeof(DCTELEM)*6*64);
00053 }
00054 
00055 static void idct_put(uint8_t *dest, int line_size, DCTELEM *block)
00056 {
00057         int i;
00058         uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
00059         idct_sh4(block);
00060         for(i=0;i<8;i++) {
00061                 dest[0] = cm[block[0]];
00062                 dest[1] = cm[block[1]];
00063                 dest[2] = cm[block[2]];
00064                 dest[3] = cm[block[3]];
00065                 dest[4] = cm[block[4]];
00066                 dest[5] = cm[block[5]];
00067                 dest[6] = cm[block[6]];
00068                 dest[7] = cm[block[7]];
00069                 dest+=line_size;
00070                 block+=8;
00071         }
00072 }
00073 static void idct_add(uint8_t *dest, int line_size, DCTELEM *block)
00074 {
00075         int i;
00076         uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
00077         idct_sh4(block);
00078         for(i=0;i<8;i++) {
00079                 dest[0] = cm[dest[0]+block[0]];
00080                 dest[1] = cm[dest[1]+block[1]];
00081                 dest[2] = cm[dest[2]+block[2]];
00082                 dest[3] = cm[dest[3]+block[3]];
00083                 dest[4] = cm[dest[4]+block[4]];
00084                 dest[5] = cm[dest[5]+block[5]];
00085                 dest[6] = cm[dest[6]+block[6]];
00086                 dest[7] = cm[dest[7]+block[7]];
00087                 dest+=line_size;
00088                 block+=8;
00089         }
00090 }
00091 
00092 void dsputil_init_sh4(DSPContext* c, AVCodecContext *avctx)
00093 {
00094         const int idct_algo= avctx->idct_algo;
00095         dsputil_init_align(c,avctx);
00096 
00097         c->clear_blocks = clear_blocks_sh4;
00098         if(idct_algo==FF_IDCT_AUTO || idct_algo==FF_IDCT_SH4){
00099                 c->idct_put = idct_put;
00100                 c->idct_add = idct_add;
00101                c->idct     = idct_sh4;
00102                 c->idct_permutation_type= FF_NO_IDCT_PERM;
00103         }
00104 }

Generated on Fri Sep 16 2011 17:17:42 for FFmpeg by  doxygen 1.7.1