path: root/libavcodec/dsd.h (plain)
blob: 5ca45748375ee9423f43b3341526c6a62fe5b60d

1	/*
2	* Direct Stream Digital (DSD) decoder
3	* based on BSD licensed dsd2pcm by Sebastian Gesemann
4	* Copyright (c) 2009, 2011 Sebastian Gesemann. All rights reserved.
5	* Copyright (c) 2014 Peter Ross
6	*
7	* This file is part of FFmpeg.
8	*
9	* FFmpeg is free software; you can redistribute it and/or
10	* modify it under the terms of the GNU Lesser General Public
11	* License as published by the Free Software Foundation; either
12	* version 2.1 of the License, or (at your option) any later version.
13	*
14	* FFmpeg is distributed in the hope that it will be useful,
15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17	* Lesser General Public License for more details.
18	*
19	* You should have received a copy of the GNU Lesser General Public
20	* License along with FFmpeg; if not, write to the Free Software
21	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22	*/
23
24	#ifndef AVCODEC_DSD_H
25	#define AVCODEC_DSD_H
26
27	#include "libavcodec/internal.h"
28	#include "libavcodec/mathops.h"
29	#include "avcodec.h"
30
31	#define HTAPS 48 /** number of FIR constants */
32	#define FIFOSIZE 16 /** must be a power of two */
33	#define FIFOMASK (FIFOSIZE - 1) /** bit mask for FIFO offsets */
34
35	#if FIFOSIZE * 8 < HTAPS * 2
36	#error "FIFOSIZE too small"
37	#endif
38
39	/**
40	* Per-channel buffer
41	*/
42	typedef struct DSDContext {
43	unsigned char buf[FIFOSIZE];
44	unsigned pos;
45	} DSDContext;
46
47	void ff_init_dsd_data(void);
48
49	void ff_dsd2pcm_translate(DSDContext* s, size_t samples, int lsbf,
50	const unsigned char *src, ptrdiff_t src_stride,
51	float *dst, ptrdiff_t dst_stride);
52	#endif /* AVCODEC_DSD_H */
53