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https://gitee.com/openharmony/third_party_ffmpeg
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6b22e28f4c
The C and asm versions behaved differently _outside_ of the codec. The C version returned pre-multiplied 'state' for the next execution to use right away, while the assembly version outputted non-multiplied 'state' for the next execution to multiply to save instructions. Since the initial state when initialized or seeking is always 0, and since C and asm versions were never mixed, there was no issue. However, comparing outputs directly in checkasm doesn't work without dividing the initial state by CELT_EMPH_COEFF and multiplying the returned state by CELT_EMPH_COEFF for the assembly function. Since its actually faster to do this in C as well, copy the behavior the asm versions use. As a reminder, the initial state 0 is divided by CELT_EMPH_COEFF on seek and init (just in case in the future this is changed, its technically more correct to init with CELT_EMPH_COEFF than 0, however when seeking this will result in more audiable pops, unlike with 0 where the output gets in sync over a few samples).
63 lines
1.7 KiB
C
63 lines
1.7 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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#include "opusdsp.h"
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static void postfilter_c(float *data, int period, float *gains, int len)
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{
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const float g0 = gains[0];
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const float g1 = gains[1];
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const float g2 = gains[2];
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float x4 = data[-period - 2];
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float x3 = data[-period - 1];
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float x2 = data[-period + 0];
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float x1 = data[-period + 1];
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for (int i = 0; i < len; i++) {
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float x0 = data[i - period + 2];
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data[i] += g0 * x2 +
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g1 * (x1 + x3) +
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g2 * (x0 + x4);
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x4 = x3;
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x3 = x2;
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x2 = x1;
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x1 = x0;
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}
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}
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static float deemphasis_c(float *y, float *x, float coeff, int len)
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{
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for (int i = 0; i < len; i++)
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coeff = y[i] = x[i] + coeff*CELT_EMPH_COEFF;
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return coeff;
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}
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av_cold void ff_opus_dsp_init(OpusDSP *ctx)
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{
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ctx->postfilter = postfilter_c;
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ctx->deemphasis = deemphasis_c;
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if (ARCH_X86)
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ff_opus_dsp_init_x86(ctx);
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if (ARCH_AARCH64)
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ff_opus_dsp_init_aarch64(ctx);
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}
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