1/* 2 * DCA ADPCM engine 3 * Copyright (C) 2017 Daniil Cherednik 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#ifndef AVCODEC_DCAADPCM_H 23#define AVCODEC_DCAADPCM_H 24 25#include "dcamath.h" 26#include "dcadata.h" 27#include "dcaenc.h" 28 29typedef struct DCAADPCMEncContext { 30 void *private_data; 31} DCAADPCMEncContext; 32 33static inline int64_t ff_dcaadpcm_predict(int pred_vq_index, const int32_t *input) 34{ 35 int i; 36 const int16_t *coeff = ff_dca_adpcm_vb[pred_vq_index]; 37 int64_t pred = 0; 38 for (i = 0; i < DCA_ADPCM_COEFFS; i++) 39 pred += (int64_t)input[DCA_ADPCM_COEFFS - 1 - i] * coeff[i]; 40 41 return clip23(norm13(pred)); 42} 43 44int ff_dcaadpcm_subband_analysis(const DCAADPCMEncContext *s, const int32_t *input, int len, int *diff); 45 46int ff_dcaadpcm_do_real(int pred_vq_index, 47 softfloat quant, int32_t scale_factor, int32_t step_size, 48 const int32_t *prev_hist, const int32_t *in, int32_t *next_hist, int32_t *out, 49 int len, int32_t peak); 50 51av_cold int ff_dcaadpcm_init(DCAADPCMEncContext *s); 52av_cold void ff_dcaadpcm_free(DCAADPCMEncContext *s); 53 54#endif /* AVCODEC_DCAADPCM_H */ 55