diff options
author | Peter Meerwald <pmeerw@pmeerw.net> | 2015-02-15 14:21:21 +0300 |
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committer | Martin Storsjö <martin@martin.st> | 2015-02-15 23:47:10 +0300 |
commit | 67690683130faf37dd9d969ced15eba2a1940ade (patch) | |
tree | 5ec3655cec9624bfd4cb1438fc152de935e34318 /libavcodec/g722dsp.c | |
parent | 4abfa387b8234736f6e0e541951e3d5eb60eb843 (diff) |
g722: Split out g722_qmf_apply() function into g722dsp.c
Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Martin Storsjö <martin@martin.st>
Diffstat (limited to 'libavcodec/g722dsp.c')
-rw-r--r-- | libavcodec/g722dsp.c | 47 |
1 files changed, 47 insertions, 0 deletions
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 <pmeerw@pmeerw.net> + * + * 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; +} |