mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-28 20:53:54 +02:00
53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
/*
|
|
* Copyright (c) 2004 Gildas Bazin
|
|
* Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "config.h"
|
|
#include "libavutil/attributes.h"
|
|
#include "dcadsp.h"
|
|
|
|
static void dca_lfe_fir_c(float *out, const float *in, const float *coefs,
|
|
int decifactor, float scale)
|
|
{
|
|
float *out2 = out + decifactor;
|
|
const float *cf0 = coefs;
|
|
const float *cf1 = coefs + 256;
|
|
int j, k;
|
|
|
|
/* One decimated sample generates 2*decifactor interpolated ones */
|
|
for (k = 0; k < decifactor; k++) {
|
|
float v0 = 0.0;
|
|
float v1 = 0.0;
|
|
for (j = 0; j < 256 / decifactor; j++) {
|
|
float s = in[-j];
|
|
v0 += s * *cf0++;
|
|
v1 += s * *--cf1;
|
|
}
|
|
*out++ = v0 * scale;
|
|
*out2++ = v1 * scale;
|
|
}
|
|
}
|
|
|
|
av_cold void ff_dcadsp_init(DCADSPContext *s)
|
|
{
|
|
s->lfe_fir = dca_lfe_fir_c;
|
|
if (ARCH_ARM) ff_dcadsp_init_arm(s);
|
|
}
|