/* * Direct Stream Digital (DSD) decoder * based on BSD licensed dsd2pcm by Sebastian Gesemann * Copyright (c) 2009, 2011 Sebastian Gesemann. All rights reserved. * Copyright (c) 2014 Peter Ross * * 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_DSD_H #define AVCODEC_DSD_H #include <stddef.h> #include <stdint.h> #define HTAPS 48 /** number of FIR constants */ #define FIFOSIZE 16 /** must be a power of two */ #define FIFOMASK (FIFOSIZE - 1) /** bit mask for FIFO offsets */ #if FIFOSIZE * 8 < HTAPS * 2 #error "FIFOSIZE too small" #endif /** * Per-channel buffer */ typedef struct DSDContext { uint8_t buf[FIFOSIZE]; unsigned pos; } DSDContext; void ff_init_dsd_data(void); void ff_dsd2pcm_translate(DSDContext* s, size_t samples, int lsbf, const uint8_t *src, ptrdiff_t src_stride, float *dst, ptrdiff_t dst_stride); #endif /* AVCODEC_DSD_H */