8009581912
This is implemented for a vector size of 128-bit. Since the scalar product in the inner loop covers 5 samples or 160 bits, we need a group multipler of 2. To avoid reconfiguring the vector type, the outer loop, which loads multiple input samples sticks to the same multipler. Consequently, the outer loop loads 8 samples per iteration. This is safe since the minimum period of the CELT codec is 15 samples. The same code would also work, albeit needlessly inefficiently with a vector length of 256 bits. A proper implementation will follow instead.
36 lines
1.2 KiB
C
36 lines
1.2 KiB
C
/*
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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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#ifndef AVCODEC_OPUSDSP_H
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#define AVCODEC_OPUSDSP_H
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#define CELT_EMPH_COEFF 0.8500061035f
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typedef struct OpusDSP {
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void (*postfilter)(float *data, int period, float *gains, int len);
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float (*deemphasis)(float *out, float *in, float coeff, int len);
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} OpusDSP;
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void ff_opus_dsp_init(OpusDSP *ctx);
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void ff_opus_dsp_init_x86(OpusDSP *ctx);
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void ff_opus_dsp_init_aarch64(OpusDSP *ctx);
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void ff_opus_dsp_init_riscv(OpusDSP *ctx);
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#endif /* AVCODEC_OPUSDSP_H */
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