FFmpeg/libavcodec/ttadata.c

/*
 * TTA (The Lossless True Audio) data
 *
 * 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 <string.h>
#include "ttadata.h"

const uint32_t ff_tta_shift_1[] = {
    0x00000001, 0x00000002, 0x00000004, 0x00000008,
    0x00000010, 0x00000020, 0x00000040, 0x00000080,
    0x00000100, 0x00000200, 0x00000400, 0x00000800,
    0x00001000, 0x00002000, 0x00004000, 0x00008000,
    0x00010000, 0x00020000, 0x00040000, 0x00080000,
    0x00100000, 0x00200000, 0x00400000, 0x00800000,
    0x01000000, 0x02000000, 0x04000000, 0x08000000,
    0x10000000, 0x20000000, 0x40000000, 0x80000000,
    0x80000000, 0x80000000, 0x80000000, 0x80000000,
    0x80000000, 0x80000000, 0x80000000, 0x80000000,
    0xFFFFFFFF
};

const uint32_t * const ff_tta_shift_16 = ff_tta_shift_1 + 4;

const uint8_t ff_tta_filter_configs[] = { 10, 9, 10, 12 };

void ff_tta_rice_init(TTARice *c, uint32_t k0, uint32_t k1)
{
    c->k0 = k0;
    c->k1 = k1;
    c->sum0 = ff_tta_shift_16[k0];
    c->sum1 = ff_tta_shift_16[k1];
}

void ff_tta_filter_init(TTAFilter *c, int32_t shift) {
    memset(c, 0, sizeof(TTAFilter));
    c->shift = shift;
    c->round = ff_tta_shift_1[shift-1];
}