1cabdff1aSopenharmony_ci/* 2cabdff1aSopenharmony_ci * Direct Stream Digital (DSD) decoder 3cabdff1aSopenharmony_ci * based on BSD licensed dsd2pcm by Sebastian Gesemann 4cabdff1aSopenharmony_ci * Copyright (c) 2009, 2011 Sebastian Gesemann. All rights reserved. 5cabdff1aSopenharmony_ci * Copyright (c) 2014 Peter Ross 6cabdff1aSopenharmony_ci * 7cabdff1aSopenharmony_ci * This file is part of FFmpeg. 8cabdff1aSopenharmony_ci * 9cabdff1aSopenharmony_ci * FFmpeg is free software; you can redistribute it and/or 10cabdff1aSopenharmony_ci * modify it under the terms of the GNU Lesser General Public 11cabdff1aSopenharmony_ci * License as published by the Free Software Foundation; either 12cabdff1aSopenharmony_ci * version 2.1 of the License, or (at your option) any later version. 13cabdff1aSopenharmony_ci * 14cabdff1aSopenharmony_ci * FFmpeg is distributed in the hope that it will be useful, 15cabdff1aSopenharmony_ci * but WITHOUT ANY WARRANTY; without even the implied warranty of 16cabdff1aSopenharmony_ci * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17cabdff1aSopenharmony_ci * Lesser General Public License for more details. 18cabdff1aSopenharmony_ci * 19cabdff1aSopenharmony_ci * You should have received a copy of the GNU Lesser General Public 20cabdff1aSopenharmony_ci * License along with FFmpeg; if not, write to the Free Software 21cabdff1aSopenharmony_ci * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 22cabdff1aSopenharmony_ci */ 23cabdff1aSopenharmony_ci 24cabdff1aSopenharmony_ci#ifndef AVCODEC_DSD_H 25cabdff1aSopenharmony_ci#define AVCODEC_DSD_H 26cabdff1aSopenharmony_ci 27cabdff1aSopenharmony_ci#include <stddef.h> 28cabdff1aSopenharmony_ci#include <stdint.h> 29cabdff1aSopenharmony_ci 30cabdff1aSopenharmony_ci#define HTAPS 48 /** number of FIR constants */ 31cabdff1aSopenharmony_ci#define FIFOSIZE 16 /** must be a power of two */ 32cabdff1aSopenharmony_ci#define FIFOMASK (FIFOSIZE - 1) /** bit mask for FIFO offsets */ 33cabdff1aSopenharmony_ci 34cabdff1aSopenharmony_ci#if FIFOSIZE * 8 < HTAPS * 2 35cabdff1aSopenharmony_ci#error "FIFOSIZE too small" 36cabdff1aSopenharmony_ci#endif 37cabdff1aSopenharmony_ci 38cabdff1aSopenharmony_ci/** 39cabdff1aSopenharmony_ci * Per-channel buffer 40cabdff1aSopenharmony_ci */ 41cabdff1aSopenharmony_citypedef struct DSDContext { 42cabdff1aSopenharmony_ci uint8_t buf[FIFOSIZE]; 43cabdff1aSopenharmony_ci unsigned pos; 44cabdff1aSopenharmony_ci} DSDContext; 45cabdff1aSopenharmony_ci 46cabdff1aSopenharmony_civoid ff_init_dsd_data(void); 47cabdff1aSopenharmony_ci 48cabdff1aSopenharmony_civoid ff_dsd2pcm_translate(DSDContext* s, size_t samples, int lsbf, 49cabdff1aSopenharmony_ci const uint8_t *src, ptrdiff_t src_stride, 50cabdff1aSopenharmony_ci float *dst, ptrdiff_t dst_stride); 51cabdff1aSopenharmony_ci#endif /* AVCODEC_DSD_H */ 52