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ffmpeg / libavcodec / fmtconvert.c @ 159683dd

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/*
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 * Format Conversion Utils
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 * Copyright (c) 2000, 2001 Fabrice Bellard
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 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
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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 "avcodec.h"
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#include "fmtconvert.h"
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static void int32_to_float_fmul_scalar_c(float *dst, const int *src, float mul, int len){
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    int i;
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    for(i=0; i<len; i++)
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        dst[i] = src[i] * mul;
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}
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static av_always_inline int float_to_int16_one(const float *src){
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    return av_clip_int16(lrintf(*src));
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}
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static void float_to_int16_c(int16_t *dst, const float *src, long len)
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{
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    int i;
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    for(i=0; i<len; i++)
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        dst[i] = float_to_int16_one(src+i);
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}
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static void float_to_int16_interleave_c(int16_t *dst, const float **src,
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                                        long len, int channels)
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{
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    int i,j,c;
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    if(channels==2){
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        for(i=0; i<len; i++){
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            dst[2*i]   = float_to_int16_one(src[0]+i);
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            dst[2*i+1] = float_to_int16_one(src[1]+i);
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        }
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    }else{
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        for(c=0; c<channels; c++)
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            for(i=0, j=c; i<len; i++, j+=channels)
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                dst[j] = float_to_int16_one(src[c]+i);
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    }
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}
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av_cold void ff_fmt_convert_init(FmtConvertContext *c, AVCodecContext *avctx)
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{
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    c->int32_to_float_fmul_scalar = int32_to_float_fmul_scalar_c;
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    c->float_to_int16             = float_to_int16_c;
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    c->float_to_int16_interleave  = float_to_int16_interleave_c;
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    if (ARCH_ARM) ff_fmt_convert_init_arm(c, avctx);
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    if (HAVE_ALTIVEC) ff_fmt_convert_init_ppc(c, avctx);
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    if (HAVE_MMX) ff_fmt_convert_init_x86(c, avctx);
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}