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51 lines
1.6 KiB
51 lines
1.6 KiB
/* |
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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 <stddef.h> |
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#include <stdint.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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uint8_t 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 uint8_t *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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