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https://gitee.com/openharmony/third_party_ffmpeg
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53 lines
1.7 KiB
C
53 lines
1.7 KiB
C
/*
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* Direct Stream Digital (DSD) decoder
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* based on BSD licensed dsd2pcm by Sebastian Gesemann
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* Copyright (c) 2009, 2011 Sebastian Gesemann. All rights reserved.
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* Copyright (c) 2014 Peter Ross
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_DSD_H
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#define AVCODEC_DSD_H
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#include "libavcodec/internal.h"
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#include "libavcodec/mathops.h"
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#include "avcodec.h"
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#define HTAPS 48 /** number of FIR constants */
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#define FIFOSIZE 16 /** must be a power of two */
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#define FIFOMASK (FIFOSIZE - 1) /** bit mask for FIFO offsets */
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#if FIFOSIZE * 8 < HTAPS * 2
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#error "FIFOSIZE too small"
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#endif
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/**
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* Per-channel buffer
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*/
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typedef struct DSDContext {
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unsigned char buf[FIFOSIZE];
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unsigned pos;
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} DSDContext;
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void ff_init_dsd_data(void);
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void ff_dsd2pcm_translate(DSDContext* s, size_t samples, int lsbf,
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const unsigned char *src, ptrdiff_t src_stride,
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float *dst, ptrdiff_t dst_stride);
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#endif /* AVCODEC_DSD_H */
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