| /* |
| * 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 "opusdsp.h" |
| |
| static void postfilter_c(float *data, int period, float *gains, int len) |
| { |
| const float g0 = gains[0]; |
| const float g1 = gains[1]; |
| const float g2 = gains[2]; |
| |
| float x4 = data[-period - 2]; |
| float x3 = data[-period - 1]; |
| float x2 = data[-period + 0]; |
| float x1 = data[-period + 1]; |
| |
| for (int i = 0; i < len; i++) { |
| float x0 = data[i - period + 2]; |
| data[i] += g0 * x2 + |
| g1 * (x1 + x3) + |
| g2 * (x0 + x4); |
| x4 = x3; |
| x3 = x2; |
| x2 = x1; |
| x1 = x0; |
| } |
| } |
| |
| static float deemphasis_c(float *y, float *x, float coeff, int len) |
| { |
| for (int i = 0; i < len; i++) |
| coeff = y[i] = x[i] + coeff*CELT_EMPH_COEFF; |
| |
| return coeff; |
| } |
| |
| av_cold void ff_opus_dsp_init(OpusDSP *ctx) |
| { |
| ctx->postfilter = postfilter_c; |
| ctx->deemphasis = deemphasis_c; |
| |
| if (ARCH_X86) |
| ff_opus_dsp_init_x86(ctx); |
| |
| if (ARCH_AARCH64) |
| ff_opus_dsp_init_aarch64(ctx); |
| } |