mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-22 07:20:45 +00:00
64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
/*
|
|
* Copyright (c) 2007-2008 Ian Caulfield
|
|
* 2009 Ramiro Polla
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg 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.
|
|
*
|
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavcodec/mlp.h"
|
|
#include "dsputil.h"
|
|
|
|
static void ff_mlp_filter_channel(int32_t *state, const int32_t *coeff,
|
|
int firorder, int iirorder,
|
|
unsigned int filter_shift, int32_t mask, int blocksize,
|
|
int32_t *sample_buffer)
|
|
{
|
|
int32_t *firbuf = state;
|
|
int32_t *iirbuf = state + MAX_BLOCKSIZE + MAX_FIR_ORDER;
|
|
const int32_t *fircoeff = coeff;
|
|
const int32_t *iircoeff = coeff + MAX_FIR_ORDER;
|
|
int i;
|
|
|
|
for (i = 0; i < blocksize; i++) {
|
|
int32_t residual = *sample_buffer;
|
|
unsigned int order;
|
|
int64_t accum = 0;
|
|
int32_t result;
|
|
|
|
for (order = 0; order < firorder; order++)
|
|
accum += (int64_t) firbuf[order] * fircoeff[order];
|
|
for (order = 0; order < iirorder; order++)
|
|
accum += (int64_t) iirbuf[order] * iircoeff[order];
|
|
|
|
accum = accum >> filter_shift;
|
|
result = (accum + residual) & mask;
|
|
|
|
*--firbuf = result;
|
|
*--iirbuf = result - accum;
|
|
|
|
*sample_buffer = result;
|
|
sample_buffer += MAX_CHANNELS;
|
|
}
|
|
}
|
|
|
|
void ff_mlp_init(DSPContext* c, AVCodecContext *avctx)
|
|
{
|
|
c->mlp_filter_channel = ff_mlp_filter_channel;
|
|
if (ARCH_X86)
|
|
ff_mlp_init_x86(c, avctx);
|
|
}
|