third_party_ffmpeg/libavcodec/sbrdsp_template.c

/*
 * AAC Spectral Band Replication decoding functions
 * Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
 * Copyright (c) 2009-2010 Alex Converse <alex.converse@gmail.com>
 *
 * 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
 */

static void sbr_sum64x5_c(float *z)
{
    int k;
    for (k = 0; k < 64; k++) {
        float f = z[k] + z[k + 64] + z[k + 128] + z[k + 192] + z[k + 256];
        z[k] = f;
    }
}

static void sbr_qmf_deint_bfly_c(float *v, const float *src0, const float *src1)
{
    int i;
    for (i = 0; i < 64; i++) {
        v[      i] = src0[i] - src1[63 - i];
        v[127 - i] = src0[i] + src1[63 - i];
    }
}

static void sbr_hf_apply_noise_0(float (*Y)[2], const float *s_m,
                                 const float *q_filt, int noise,
                                 int kx, int m_max)
{
    sbr_hf_apply_noise(Y, s_m, q_filt, noise, 1.0, 0.0, m_max);
}

static void sbr_hf_apply_noise_1(float (*Y)[2], const float *s_m,
                                 const float *q_filt, int noise,
                                 int kx, int m_max)
{
    float phi_sign = 1 - 2 * (kx & 1);
    sbr_hf_apply_noise(Y, s_m, q_filt, noise, 0.0, phi_sign, m_max);
}

static void sbr_hf_apply_noise_2(float (*Y)[2], const float *s_m,
                                 const float *q_filt, int noise,
                                 int kx, int m_max)
{
    sbr_hf_apply_noise(Y, s_m, q_filt, noise, -1.0, 0.0, m_max);
}

static void sbr_hf_apply_noise_3(float (*Y)[2], const float *s_m,
                                 const float *q_filt, int noise,
                                 int kx, int m_max)
{
    float phi_sign = 1 - 2 * (kx & 1);
    sbr_hf_apply_noise(Y, s_m, q_filt, noise, 0.0, -phi_sign, m_max);
}

av_cold void ff_sbrdsp_init(SBRDSPContext *s)
{
    s->sum64x5 = sbr_sum64x5_c;
    s->sum_square = sbr_sum_square_c;
    s->neg_odd_64 = sbr_neg_odd_64_c;
    s->qmf_pre_shuffle = sbr_qmf_pre_shuffle_c;
    s->qmf_post_shuffle = sbr_qmf_post_shuffle_c;
    s->qmf_deint_neg = sbr_qmf_deint_neg_c;
    s->qmf_deint_bfly = sbr_qmf_deint_bfly_c;
    s->autocorrelate = sbr_autocorrelate_c;
    s->hf_gen = sbr_hf_gen_c;
    s->hf_g_filt = sbr_hf_g_filt_c;

    s->hf_apply_noise[0] = sbr_hf_apply_noise_0;
    s->hf_apply_noise[1] = sbr_hf_apply_noise_1;
    s->hf_apply_noise[2] = sbr_hf_apply_noise_2;
    s->hf_apply_noise[3] = sbr_hf_apply_noise_3;

    if (ARCH_ARM)
        ff_sbrdsp_init_arm(s);
    if (ARCH_X86)
        ff_sbrdsp_init_x86(s);
    if (ARCH_MIPS)
        ff_sbrdsp_init_mips(s);
}