From bf4f19dc654b91dfc8405e124cac8a1eb912da74 Mon Sep 17 00:00:00 2001 From: Ramiro Polla Date: Thu, 30 Apr 2009 12:30:05 +0000 Subject: mlpdec: Move MLP's filter_channel() to dsputils. Originally committed as revision 18721 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/mlpdsp.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 libavcodec/mlpdsp.c (limited to 'libavcodec/mlpdsp.c') diff --git a/libavcodec/mlpdsp.c b/libavcodec/mlpdsp.c new file mode 100644 index 0000000000..c89bcc508b --- /dev/null +++ b/libavcodec/mlpdsp.c @@ -0,0 +1,56 @@ +/* + * 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 "dsputil.h" + +static void ff_mlp_filter_channel(int32_t *firbuf, const int32_t *fircoeff, int firorder, + int32_t *iirbuf, const int32_t *iircoeff, int iirorder, + unsigned int filter_shift, int32_t mask, int blocksize, + int32_t *sample_buffer) +{ + 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 += 8; + } +} + +void ff_mlp_init(DSPContext* c, AVCodecContext *avctx) +{ + c->mlp_filter_channel = ff_mlp_filter_channel; +} -- cgit v1.2.3