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https://github.com/FFmpeg/FFmpeg.git
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103 lines
3.9 KiB
C
103 lines
3.9 KiB
C
/*
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* Copyright (c) 2012
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* MIPS Technologies, Inc., California.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the MIPS Technologies, Inc., nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Author: Nedeljko Babic (nbabic@mips.com)
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 "fixed_dsp.h"
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static void vector_fmul_window_fixed_scaled_c(int16_t *dst, const int32_t *src0,
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const int32_t *src1, const int32_t *win,
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int len, uint8_t bits)
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{
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int32_t s0, s1, wi, wj, i,j, round;
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dst += len;
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win += len;
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src0+= len;
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round = bits? 1 << (bits-1) : 0;
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for (i=-len, j=len-1; i<0; i++, j--) {
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s0 = src0[i];
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s1 = src1[j];
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wi = win[i];
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wj = win[j];
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dst[i] = av_clip_int16(((((int64_t)s0*wj - (int64_t)s1*wi + 0x40000000) >> 31) + round) >> bits);
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dst[j] = av_clip_int16(((((int64_t)s0*wi + (int64_t)s1*wj + 0x40000000) >> 31) + round) >> bits);
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}
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}
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static void vector_fmul_window_fixed_c(int32_t *dst, const int32_t *src0,
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const int32_t *src1, const int32_t *win,
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int len)
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{
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int32_t s0, s1, wi, wj, i, j;
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dst += len;
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win += len;
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src0+= len;
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for (i=-len, j=len-1; i<0; i++, j--) {
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s0 = src0[i];
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s1 = src1[j];
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wi = win[i];
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wj = win[j];
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dst[i] = ((int64_t)s0*wj - (int64_t)s1*wi + 0x40000000) >> 31;
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dst[j] = ((int64_t)s0*wi + (int64_t)s1*wj + 0x40000000) >> 31;
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}
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}
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AVFixedDSPContext * avpriv_alloc_fixed_dsp(int bit_exact)
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{
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AVFixedDSPContext * fdsp = av_malloc(sizeof(AVFixedDSPContext));
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if (!fdsp)
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return NULL;
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fdsp->vector_fmul_window_scaled = vector_fmul_window_fixed_scaled_c;
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fdsp->vector_fmul_window = vector_fmul_window_fixed_c;
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return fdsp;
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}
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