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65 lines
2.1 KiB
65 lines
2.1 KiB
/* |
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* Copyright (c) 2007-2008 Ian Caulfield |
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* 2009 Ramiro Polla |
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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 "config.h" |
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#include "libavutil/attributes.h" |
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#include "mlpdsp.h" |
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#include "mlp.h" |
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static void mlp_filter_channel(int32_t *state, const int32_t *coeff, |
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int firorder, int iirorder, |
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unsigned int filter_shift, int32_t mask, |
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int blocksize, int32_t *sample_buffer) |
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{ |
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int32_t *firbuf = state; |
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int32_t *iirbuf = state + MAX_BLOCKSIZE + MAX_FIR_ORDER; |
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const int32_t *fircoeff = coeff; |
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const int32_t *iircoeff = coeff + MAX_FIR_ORDER; |
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int i; |
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for (i = 0; i < blocksize; i++) { |
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int32_t residual = *sample_buffer; |
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unsigned int order; |
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int64_t accum = 0; |
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int32_t result; |
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for (order = 0; order < firorder; order++) |
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accum += (int64_t) firbuf[order] * fircoeff[order]; |
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for (order = 0; order < iirorder; order++) |
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accum += (int64_t) iirbuf[order] * iircoeff[order]; |
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accum = accum >> filter_shift; |
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result = (accum + residual) & mask; |
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*--firbuf = result; |
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*--iirbuf = result - accum; |
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*sample_buffer = result; |
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sample_buffer += MAX_CHANNELS; |
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} |
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} |
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av_cold void ff_mlpdsp_init(MLPDSPContext *c) |
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{ |
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c->mlp_filter_channel = mlp_filter_channel; |
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if (ARCH_X86) |
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ff_mlpdsp_init_x86(c); |
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}
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