1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
/* Gstreamer
* Copyright (C) <2011> Intel Corporation
* Copyright (C) <2011> Collabora Ltd.
* Copyright (C) <2011> Thibault Saunier <thibault.saunier@collabora.com>
*
* Some bits C-c,C-v'ed and s/4/3 from h264parse and videoparsers/h264parse.c:
* Copyright (C) <2010> Mark Nauwelaerts <mark.nauwelaerts@collabora.co.uk>
* Copyright (C) <2010> Collabora Multimedia
* Copyright (C) <2010> Nokia Corporation
*
* (C) 2005 Michal Benes <michal.benes@itonis.tv>
* (C) 2008 Wim Taymans <wim.taymans@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* Common code for NAL parsing from h264 and h265 parsers.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <gst/base/gstbytereader.h>
#include <gst/base/gstbitreader.h>
#include <string.h>
guint ceil_log2 (guint32 v);
typedef struct
{
const guint8 *data;
guint size;
guint n_epb; /* Number of emulation prevention bytes */
guint byte; /* Byte position */
guint bits_in_cache; /* bitpos in the cache of next bit */
guint8 first_byte;
guint64 cache; /* cached bytes */
} NalReader;
void nal_reader_init (NalReader * nr, const guint8 * data, guint size);
gboolean nal_reader_read (NalReader * nr, guint nbits);
gboolean nal_reader_skip (NalReader * nr, guint nbits);
gboolean nal_reader_skip_long (NalReader * nr, guint nbits);
guint nal_reader_get_pos (const NalReader * nr);
guint nal_reader_get_remaining (const NalReader * nr);
guint nal_reader_get_epb_count (const NalReader * nr);
gboolean nal_reader_is_byte_aligned (NalReader * nr);
gboolean nal_reader_has_more_data (NalReader * nr);
#define NAL_READER_READ_BITS_H(bits) \
gboolean nal_reader_get_bits_uint##bits (NalReader *nr, guint##bits *val, guint nbits)
NAL_READER_READ_BITS_H (8);
NAL_READER_READ_BITS_H (16);
NAL_READER_READ_BITS_H (32);
#define NAL_READER_PEEK_BITS_H(bits) \
gboolean nal_reader_peek_bits_uint##bits (const NalReader *nr, guint##bits *val, guint nbits)
NAL_READER_PEEK_BITS_H (8);
gboolean nal_reader_get_ue (NalReader * nr, guint32 * val);
gboolean nal_reader_get_se (NalReader * nr, gint32 * val);
#define CHECK_ALLOWED(val, min, max) { \
if (val < min || val > max) { \
GST_WARNING ("value not in allowed range. value: %d, range %d-%d", \
val, min, max); \
goto error; \
} \
}
#define READ_UINT8(nr, val, nbits) { \
if (!nal_reader_get_bits_uint8 (nr, &val, nbits)) { \
GST_WARNING ("failed to read uint8, nbits: %d", nbits); \
goto error; \
} \
}
#define READ_UINT16(nr, val, nbits) { \
if (!nal_reader_get_bits_uint16 (nr, &val, nbits)) { \
GST_WARNING ("failed to read uint16, nbits: %d", nbits); \
goto error; \
} \
}
#define READ_UINT32(nr, val, nbits) { \
if (!nal_reader_get_bits_uint32 (nr, &val, nbits)) { \
GST_WARNING ("failed to read uint32, nbits: %d", nbits); \
goto error; \
} \
}
#define READ_UINT64(nr, val, nbits) { \
if (!nal_reader_get_bits_uint64 (nr, &val, nbits)) { \
GST_WARNING ("failed to read uint32, nbits: %d", nbits); \
goto error; \
} \
}
#define READ_UE(nr, val) { \
if (!nal_reader_get_ue (nr, &val)) { \
GST_WARNING ("failed to read UE"); \
goto error; \
} \
}
#define READ_UE_ALLOWED(nr, val, min, max) { \
guint32 tmp; \
READ_UE (nr, tmp); \
CHECK_ALLOWED (tmp, min, max); \
val = tmp; \
}
#define READ_SE(nr, val) { \
if (!nal_reader_get_se (nr, &val)) { \
GST_WARNING ("failed to read SE"); \
goto error; \
} \
}
#define READ_SE_ALLOWED(nr, val, min, max) { \
gint32 tmp; \
READ_SE (nr, tmp); \
CHECK_ALLOWED (tmp, min, max); \
val = tmp; \
}
gint scan_for_start_codes (const guint8 * data, guint size);
|
