mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
63 lines
2.1 KiB
63 lines
2.1 KiB
/* |
|
* Copyright (c) 2007-2008 Ian Caulfield |
|
* 2009 Ramiro Polla |
|
* |
|
* 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 "dsputil.h" |
|
#include "mlp.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); |
|
}
|
|
|