From 4a8528349f897fba72e6eb41400aca3ca4605a79 Mon Sep 17 00:00:00 2001 From: Mans Rullgard Date: Sun, 17 Jun 2012 15:10:40 +0100 Subject: flacdec: split off channel decorrelation as flacdsp Signed-off-by: Mans Rullgard --- libavcodec/flacdsp_template.c | 86 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 86 insertions(+) create mode 100644 libavcodec/flacdsp_template.c (limited to 'libavcodec/flacdsp_template.c') diff --git a/libavcodec/flacdsp_template.c b/libavcodec/flacdsp_template.c new file mode 100644 index 0000000000..34da5a6d25 --- /dev/null +++ b/libavcodec/flacdsp_template.c @@ -0,0 +1,86 @@ +/* + * Copyright (c) 2012 Mans Rullgard + * + * 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 + +#undef FUNC +#undef sample + +#if SAMPLE_SIZE == 32 +# define FUNC(n) n ## _32 +# define sample int32_t +#else +# define FUNC(n) n ## _16 +# define sample int16_t +#endif + +static void FUNC(flac_decorrelate_indep_c)(uint8_t **out, int32_t **in, + int channels, int len, int shift) +{ + sample *samples = (sample *) out[0]; + int i, j; + + for (j = 0; j < len; j++) + for (i = 0; i < channels; i++) + *samples++ = in[i][j] << shift; +} + +static void FUNC(flac_decorrelate_ls_c)(uint8_t **out, int32_t **in, + int channels, int len, int shift) +{ + sample *samples = (sample *) out[0]; + int i; + + for (i = 0; i < len; i++) { + int a = in[0][i]; + int b = in[1][i]; + *samples++ = a << shift; + *samples++ = (a - b) << shift; + } +} + +static void FUNC(flac_decorrelate_rs_c)(uint8_t **out, int32_t **in, + int channels, int len, int shift) +{ + sample *samples = (sample *) out[0]; + int i; + + for (i = 0; i < len; i++) { + int a = in[0][i]; + int b = in[1][i]; + *samples++ = (a + b) << shift; + *samples++ = b << shift; + } +} + +static void FUNC(flac_decorrelate_ms_c)(uint8_t **out, int32_t **in, + int channels, int len, int shift) +{ + sample *samples = (sample *) out[0]; + int i; + + for (i = 0; i < len; i++) { + int a = in[0][i]; + int b = in[1][i]; + a -= b >> 1; + *samples++ = (a + b) << shift; + *samples++ = a << shift; + } +} -- cgit v1.2.3