From 67690683130faf37dd9d969ced15eba2a1940ade Mon Sep 17 00:00:00 2001 From: Peter Meerwald Date: Sun, 15 Feb 2015 12:21:21 +0100 Subject: g722: Split out g722_qmf_apply() function into g722dsp.c MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Peter Meerwald Signed-off-by: Martin Storsjö --- libavcodec/g722dsp.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 libavcodec/g722dsp.c (limited to 'libavcodec/g722dsp.c') diff --git a/libavcodec/g722dsp.c b/libavcodec/g722dsp.c new file mode 100644 index 0000000000..1fefc6b3c4 --- /dev/null +++ b/libavcodec/g722dsp.c @@ -0,0 +1,47 @@ +/* + * Copyright (c) 2015 Peter Meerwald + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "g722dsp.h" +#include "mathops.h" + +/* + * quadrature mirror filter (QMF) coefficients (ITU-T G.722 Table 11) inlined + * in code below: 3, -11, 12, 32, -210, 951, 3876, -805, 362, -156, 53, -11 + */ +static const int16_t qmf_coeffs[12] = { + 3, -11, 12, 32, -210, 951, 3876, -805, 362, -156, 53, -11, +}; + +static void g722_apply_qmf(const int16_t *prev_samples, int *xout1, int *xout2) +{ + int i; + + *xout1 = 0; + *xout2 = 0; + for (i = 0; i < 12; i++) { + MAC16(*xout2, prev_samples[2*i ], qmf_coeffs[i ]); + MAC16(*xout1, prev_samples[2*i+1], qmf_coeffs[11-i]); + } +} + +av_cold void ff_g722dsp_init(G722DSPContext *c) +{ + c->apply_qmf = g722_apply_qmf; +} -- cgit v1.2.3