FFmpeg
dcadec.h
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1 /*
2  * Copyright (C) 2016 foo86
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef AVCODEC_DCADEC_H
22 #define AVCODEC_DCADEC_H
23 
24 #include <stdint.h>
25 
26 #include "libavutil/crc.h"
27 #include "libavutil/float_dsp.h"
28 #include "libavutil/log.h"
29 
30 #include "avcodec.h"
31 #include "get_bits.h"
32 #include "dca.h"
33 #include "dcadsp.h"
34 #include "dca_core.h"
35 #include "dca_exss.h"
36 #include "dca_xll.h"
37 #include "dca_lbr.h"
38 
39 #define DCA_PACKET_CORE 0x01
40 #define DCA_PACKET_EXSS 0x02
41 #define DCA_PACKET_XLL 0x04
42 #define DCA_PACKET_LBR 0x08
43 #define DCA_PACKET_MASK 0x0f
44 
45 #define DCA_PACKET_RECOVERY 0x10 ///< Sync error recovery flag
46 #define DCA_PACKET_RESIDUAL 0x20 ///< Core valid for residual decoding
47 
51 };
52 
53 typedef struct DCAContext {
54  const AVClass *class; ///< class for AVOptions
56 
57  DCACoreDecoder core; ///< Core decoder context
58  DCAExssParser exss; ///< EXSS parser context
59  DCAXllDecoder xll; ///< XLL decoder context
60  DCALbrDecoder lbr; ///< LBR decoder context
61 
63 
64  const AVCRC *crctab;
65 
66  uint8_t *buffer; ///< Packet buffer
67  unsigned int buffer_size;
68 
69  int packet; ///< Packet flags
70 
71  int request_channel_layout; ///< Converted from avctx.request_channel_layout
72  int core_only; ///< Core only decoding flag
75 } DCAContext;
76 
77 int ff_dca_set_channel_layout(AVCodecContext *avctx, int *ch_remap, int dca_mask);
78 
80  int *coeff_l, int nsamples, int ch_mask);
82  int *coeff_l, int nsamples, int ch_mask);
83 
84 static inline int ff_dca_check_crc(AVCodecContext *avctx, GetBitContext *s,
85  int p1, int p2)
86 {
87  DCAContext *dca = avctx->priv_data;
88 
89  if (!(avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_CAREFUL)))
90  return 0;
91  if (((p1 | p2) & 7) || p1 < 0 || p2 > s->size_in_bits || p2 - p1 < 16)
92  return -1;
93  if (av_crc(dca->crctab, 0xffff, s->buffer + p1 / 8, (p2 - p1) / 8))
94  return -1;
95  return 0;
96 }
97 
98 static inline int ff_dca_seek_bits(GetBitContext *s, int p)
99 {
100  if (p < get_bits_count(s) || p > s->size_in_bits)
101  return -1;
103  return 0;
104 }
105 
106 #endif
skip_bits_long
static void skip_bits_long(GetBitContext *s, int n)
Skips the specified number of bits.
Definition: get_bits.h:291
DCAContext::output_channel_order
int output_channel_order
Definition: dcadec.h:73
CHANNEL_ORDER_CODED
@ CHANNEL_ORDER_CODED
Definition: dcadec.h:50
DCAContext::crctab
const AVCRC * crctab
Definition: dcadec.h:64
dca.h
AVCRC
uint32_t AVCRC
Definition: crc.h:46
AVCodecContext::err_recognition
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:1353
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:219
DCAContext::request_channel_layout
int request_channel_layout
Converted from avctx.request_channel_layout.
Definition: dcadec.h:71
DCAExssParser
Definition: dca_exss.h:71
ff_dca_seek_bits
static int ff_dca_seek_bits(GetBitContext *s, int p)
Definition: dcadec.h:98
ff_dca_check_crc
static int ff_dca_check_crc(AVCodecContext *avctx, GetBitContext *s, int p1, int p2)
Definition: dcadec.h:84
crc.h
DCAContext::core_only
int core_only
Core only decoding flag.
Definition: dcadec.h:72
GetBitContext
Definition: get_bits.h:61
dca_core.h
DCACoreDecoder
Definition: dca_core.h:99
DCAContext::lbr
DCALbrDecoder lbr
LBR decoder context.
Definition: dcadec.h:60
DCAContext::exss
DCAExssParser exss
EXSS parser context.
Definition: dcadec.h:58
DCAContext::dcadsp
DCADSPContext dcadsp
Definition: dcadec.h:62
DCAContext::packet
int packet
Packet flags.
Definition: dcadec.h:69
s
#define s(width, name)
Definition: cbs_vp9.c:256
DCAContext::buffer
uint8_t * buffer
Packet buffer.
Definition: dcadec.h:66
get_bits.h
dca_exss.h
DCALbrDecoder
Definition: dca_lbr.h:56
ff_dca_downmix_to_stereo_fixed
void ff_dca_downmix_to_stereo_fixed(DCADSPContext *dcadsp, int32_t **samples, int *coeff_l, int nsamples, int ch_mask)
Definition: dcadec.c:85
DCAContext::avctx
AVCodecContext * avctx
Definition: dcadec.h:55
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
DCAContext::xll
DCAXllDecoder xll
XLL decoder context.
Definition: dcadec.h:59
ff_dca_set_channel_layout
int ff_dca_set_channel_layout(AVCodecContext *avctx, int *ch_remap, int dca_mask)
Definition: dcadec.c:34
DCADSPContext
Definition: dcadsp.h:30
CHANNEL_ORDER_DEFAULT
@ CHANNEL_ORDER_DEFAULT
Definition: dcadec.h:49
float_dsp.h
AV_EF_CAREFUL
#define AV_EF_CAREFUL
consider things that violate the spec, are fast to calculate and have not been seen in the wild as er...
Definition: avcodec.h:1367
DCAContext::downmix_layout
AVChannelLayout downmix_layout
Definition: dcadec.h:74
AVChannelLayout
An AVChannelLayout holds information about the channel layout of audio data.
Definition: channel_layout.h:290
AVFloatDSPContext
Definition: float_dsp.h:24
dcadsp.h
DCAContext
Definition: dcadec.h:53
log.h
avcodec.h
DCAXllDecoder
Definition: dca_xll.h:103
AV_EF_CRCCHECK
#define AV_EF_CRCCHECK
Verify checksums embedded in the bitstream (could be of either encoded or decoded data,...
Definition: avcodec.h:1361
DCAOutputChannelOrder
DCAOutputChannelOrder
Definition: dcadec.h:48
AVCodecContext
main external API structure.
Definition: avcodec.h:398
dca_xll.h
av_crc
uint32_t av_crc(const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t length)
Calculate the CRC of a block.
Definition: crc.c:392
DCAContext::buffer_size
unsigned int buffer_size
Definition: dcadec.h:67
samples
Filter the word “frame” indicates either a video frame or a group of audio samples
Definition: filter_design.txt:8
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:425
int32_t
int32_t
Definition: audioconvert.c:56
DCAContext::core
DCACoreDecoder core
Core decoder context.
Definition: dcadec.h:57
dca_lbr.h
ff_dca_downmix_to_stereo_float
void ff_dca_downmix_to_stereo_float(AVFloatDSPContext *fdsp, float **samples, int *coeff_l, int nsamples, int ch_mask)
Definition: dcadec.c:116