diff options
Diffstat (limited to 'libavcodec/takdsp.c')
-rw-r--r-- | libavcodec/takdsp.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/libavcodec/takdsp.c b/libavcodec/takdsp.c new file mode 100644 index 0000000..2441c2b --- /dev/null +++ b/libavcodec/takdsp.c @@ -0,0 +1,82 @@ +/* + * TAK decoder + * Copyright (c) 2015 Paul B Mahol + * + * 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 "libavutil/attributes.h" +#include "takdsp.h" +#include "config.h" + +static void decorrelate_ls(int32_t *p1, int32_t *p2, int length) +{ + int i; + + for (i = 0; i < length; i++) { + int32_t a = p1[i]; + int32_t b = p2[i]; + p2[i] = a + b; + } +} + +static void decorrelate_sr(int32_t *p1, int32_t *p2, int length) +{ + int i; + + for (i = 0; i < length; i++) { + int32_t a = p1[i]; + int32_t b = p2[i]; + p1[i] = b - a; + } +} + +static void decorrelate_sm(int32_t *p1, int32_t *p2, int length) +{ + int i; + + for (i = 0; i < length; i++) { + int32_t a = p1[i]; + int32_t b = p2[i]; + a -= b >> 1; + p1[i] = a; + p2[i] = a + b; + } +} + +static void decorrelate_sf(int32_t *p1, int32_t *p2, int length, int dshift, int dfactor) +{ + int i; + + for (i = 0; i < length; i++) { + int32_t a = p1[i]; + int32_t b = p2[i]; + b = dfactor * (b >> dshift) + 128 >> 8 << dshift; + p1[i] = b - a; + } +} + +av_cold void ff_takdsp_init(TAKDSPContext *c) +{ + c->decorrelate_ls = decorrelate_ls; + c->decorrelate_sr = decorrelate_sr; + c->decorrelate_sm = decorrelate_sm; + c->decorrelate_sf = decorrelate_sf; + + if (ARCH_X86) + ff_takdsp_init_x86(c); +} |