aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* 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 "libavcodec/internal.h"
#include "libavcodec/mathops.h"
#include "avcodec.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 {
unsigned char buf[FIFOSIZE];
unsigned pos;
} DSDContext;
void ff_init_dsd_data(void);
void ff_dsd2pcm_translate(DSDContext* s, size_t samples, int lsbf,
const unsigned char *src, ptrdiff_t src_stride,
float *dst, ptrdiff_t dst_stride);
#endif /* AVCODEC_DSD_H */
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