~ppsspp/ppsspp/ffmpeg

/*

 * 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