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- /*
- * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
- *
- * 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 <math.h>
- #include <stdint.h>
-
- #include "libavutil/common.h"
- #include "internal.h"
-
- #if defined(CONFIG_RESAMPLE_DBL)
- #define SET_TYPE(func) func ## _dbl
- #define FELEM double
- #define FELEM2 double
- #define FELEML double
- #define OUT(d, v) d = v
- #define DBL_TO_FELEM(d, v) d = v
- #elif defined(CONFIG_RESAMPLE_FLT)
- #define SET_TYPE(func) func ## _flt
- #define FELEM float
- #define FELEM2 float
- #define FELEML float
- #define OUT(d, v) d = v
- #define DBL_TO_FELEM(d, v) d = v
- #elif defined(CONFIG_RESAMPLE_S32)
- #define SET_TYPE(func) func ## _s32
- #define FELEM int32_t
- #define FELEM2 int64_t
- #define FELEML int64_t
- #define OUT(d, v) d = av_clipl_int32((v + (1 << 29)) >> 30)
- #define DBL_TO_FELEM(d, v) d = av_clipl_int32(llrint(v * (1 << 30)));
- #else
- #define SET_TYPE(func) func ## _s16
- #define FELEM int16_t
- #define FELEM2 int32_t
- #define FELEML int64_t
- #define OUT(d, v) d = av_clip_int16((v + (1 << 14)) >> 15)
- #define DBL_TO_FELEM(d, v) d = av_clip_int16(lrint(v * (1 << 15)))
- #endif
-
- static void SET_TYPE(resample_nearest)(void *dst0, int dst_index, const void *src0, unsigned int index)
- {
- FELEM *dst = dst0;
- const FELEM *src = src0;
- dst[dst_index] = src[index];
- }
-
- static void SET_TYPE(resample_linear)(ResampleContext *c, void *dst0, int dst_index,
- const void *src0, unsigned int index, int frac)
- {
- FELEM *dst = dst0;
- const FELEM *src = src0;
- int i;
- unsigned int sample_index = index >> c->phase_shift;
- FELEM2 val = 0;
- FELEM *filter = ((FELEM *)c->filter_bank) +
- c->filter_length * (index & c->phase_mask);
- FELEM2 v2 = 0;
-
- for (i = 0; i < c->filter_length; i++) {
- val += src[sample_index + i] * (FELEM2)filter[i];
- v2 += src[sample_index + i] * (FELEM2)filter[i + c->filter_length];
- }
- val += (v2 - val) * (FELEML)frac / c->src_incr;
-
- OUT(dst[dst_index], val);
- }
-
- static void SET_TYPE(resample_one)(ResampleContext *c,
- void *dst0, int dst_index, const void *src0,
- unsigned int index, int frac)
- {
- FELEM *dst = dst0;
- const FELEM *src = src0;
- int i;
- unsigned int sample_index = index >> c->phase_shift;
- FELEM2 val = 0;
- FELEM *filter = ((FELEM *)c->filter_bank) +
- c->filter_length * (index & c->phase_mask);
-
- for (i = 0; i < c->filter_length; i++)
- val += src[sample_index + i] * (FELEM2)filter[i];
-
- OUT(dst[dst_index], val);
- }
-
- static void SET_TYPE(set_filter)(void *filter0, double *tab, int phase,
- int tap_count)
- {
- int i;
- FELEM *filter = ((FELEM *)filter0) + phase * tap_count;
- for (i = 0; i < tap_count; i++) {
- DBL_TO_FELEM(filter[i], tab[i]);
- }
- }
-
- #undef SET_TYPE
- #undef FELEM
- #undef FELEM2
- #undef FELEML
- #undef OUT
- #undef DBL_TO_FELEM
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