FFmpeg/libavcodec/aacencdsp.h

/*
 * 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
 */

#ifndef AVCODEC_AACENCDSP_H
#define AVCODEC_AACENCDSP_H

#include <math.h>

#include "config.h"

#include "libavutil/macros.h"

typedef struct AACEncDSPContext {
    void (*abs_pow34)(float *out, const float *in, const int size);
    void (*quant_bands)(int *out, const float *in, const float *scaled,
                        int size, int is_signed, int maxval, const float Q34,
                        const float rounding);
} AACEncDSPContext;

void ff_aacenc_dsp_init_riscv(AACEncDSPContext *s);
void ff_aacenc_dsp_init_x86(AACEncDSPContext *s);
void ff_aacenc_dsp_init_aarch64(AACEncDSPContext *s);

static inline void abs_pow34_v(float *out, const float *in, const int size)
{
    for (int i = 0; i < size; i++) {
        float a = fabsf(in[i]);
        out[i] = sqrtf(a * sqrtf(a));
    }
}

static inline void quantize_bands(int *out, const float *in, const float *scaled,
                                  int size, int is_signed, int maxval, const float Q34,
                                  const float rounding)
{
    for (int i = 0; i < size; i++) {
        float qc = scaled[i] * Q34;
        int tmp = (int)FFMIN(qc + rounding, (float)maxval);
        if (is_signed && in[i] < 0.0f) {
            tmp = -tmp;
        }
        out[i] = tmp;
    }
}

static inline void ff_aacenc_dsp_init(AACEncDSPContext *s)
{
    s->abs_pow34   = abs_pow34_v;
    s->quant_bands = quantize_bands;

#if ARCH_RISCV
    ff_aacenc_dsp_init_riscv(s);
#elif ARCH_X86
    ff_aacenc_dsp_init_x86(s);
#elif ARCH_AARCH64
    ff_aacenc_dsp_init_aarch64(s);
#endif
}

#endif