FFmpeg
dsd.h
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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 {
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 uint8_t *src, ptrdiff_t src_stride,
51  float *dst, ptrdiff_t dst_stride);
52 #endif /* AVCODEC_DSD_H */
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)
Definition: dsd.c:55
#define src
Definition: vp8dsp.c:254
void ff_init_dsd_data(void)
Definition: dsd.c:46
uint8_t
Per-channel buffer.
Definition: dsd.h:42
#define s(width, name)
Definition: cbs_vp9.c:257
Libavcodec external API header.
unsigned pos
Definition: dsd.h:44
uint8_t buf[FIFOSIZE]
Definition: dsd.h:43
common internal api header.
#define FIFOSIZE
Definition: dsd.h:32
Filter the word “frame” indicates either a video frame or a group of audio samples