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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/*
* Copyright (C) 2008 Julian Scheel
*
* This file is part of xine, a free video player.
*
* xine is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* xine 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
*
* nal.c: nal-structure utility functions
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "nal.h"
#include <xine/xine_internal.h>
struct nal_buffer* create_nal_buffer(uint8_t max_size)
{
struct nal_buffer *nal_buffer = calloc(1, sizeof(struct nal_buffer));
nal_buffer->max_size = max_size;
return nal_buffer;
}
/**
* destroys a nal buffer. all referenced nals are released
*/
void free_nal_buffer(struct nal_buffer *nal_buffer)
{
struct nal_unit *nal = nal_buffer->first;
while (nal) {
struct nal_unit *delete = nal;
nal = nal->next;
release_nal_unit(delete);
}
free(nal_buffer);
}
/**
* appends a nal unit to the end of the buffer
*/
void nal_buffer_append(struct nal_buffer *nal_buffer, struct nal_unit *nal)
{
if(nal_buffer->used == nal_buffer->max_size) {
nal_buffer_remove(nal_buffer, nal_buffer->first);
}
if (nal_buffer->first == NULL) {
nal_buffer->first = nal_buffer->last = nal;
nal->prev = nal->next = NULL;
lock_nal_unit(nal);
nal_buffer->used++;
} else if (nal_buffer->last != NULL) {
nal_buffer->last->next = nal;
nal->prev = nal_buffer->last;
nal_buffer->last = nal;
lock_nal_unit(nal);
nal_buffer->used++;
} else {
lprintf("ERR: nal_buffer is in a broken state\n");
}
}
void nal_buffer_remove(struct nal_buffer *nal_buffer, struct nal_unit *nal)
{
if (nal == nal_buffer->first && nal == nal_buffer->last) {
nal_buffer->first = nal_buffer->last = NULL;
} else {
if (nal == nal_buffer->first) {
nal_buffer->first = nal->next;
nal_buffer->first->prev = NULL;
} else {
nal->prev->next = nal->next;
}
if (nal == nal_buffer->last) {
nal_buffer->last = nal->prev;
nal_buffer->last->next = NULL;
} else {
nal->next->prev = nal->prev;
}
}
nal->next = nal->prev = NULL;
release_nal_unit(nal);
nal_buffer->used--;
}
void nal_buffer_flush(struct nal_buffer *nal_buffer)
{
while(nal_buffer->used > 0) {
nal_buffer_remove(nal_buffer, nal_buffer->first);
}
}
/**
* returns the last element in the buffer
*/
struct nal_unit *nal_buffer_get_last(struct nal_buffer *nal_buffer)
{
return nal_buffer->last;
}
/**
* get a nal unit from a nal_buffer from it's
* seq parameter_set_id
*/
struct nal_unit* nal_buffer_get_by_sps_id(struct nal_buffer *nal_buffer,
uint32_t seq_parameter_set_id)
{
struct nal_unit *nal = nal_buffer->last;
if (nal != NULL) {
do {
if(nal->nal_unit_type == NAL_SPS) {
if(nal->sps.seq_parameter_set_id == seq_parameter_set_id) {
return nal;
}
}
nal = nal->prev;
} while(nal != NULL);
}
return NULL;
}
/**
* get a nal unit from a nal_buffer from it's
* pic parameter_set_id
*/
struct nal_unit* nal_buffer_get_by_pps_id(struct nal_buffer *nal_buffer,
uint32_t pic_parameter_set_id)
{
struct nal_unit *nal = nal_buffer->last;
if (nal != NULL) {
do {
if(nal->nal_unit_type == NAL_PPS) {
if(nal->pps.pic_parameter_set_id == pic_parameter_set_id) {
return nal;
}
}
nal = nal->prev;
} while(nal != NULL);
}
return NULL;
}
/**
* create a new nal unit, with a lock_counter of 1
*/
struct nal_unit* create_nal_unit()
{
struct nal_unit *nal = calloc(1, sizeof(struct nal_unit));
nal->lock_counter = 1;
return nal;
}
void lock_nal_unit(struct nal_unit *nal)
{
nal->lock_counter++;
}
void release_nal_unit(struct nal_unit *nal)
{
if(!nal)
return;
nal->lock_counter--;
if(nal->lock_counter <= 0) {
free(nal);
}
}
/**
* creates a copy of a nal unit with a single lock
*/
void copy_nal_unit(struct nal_unit *dest, struct nal_unit *src)
{
/* size without pps, sps and slc units: */
int size = sizeof(struct nal_unit);
xine_fast_memcpy(dest, src, size);
dest->lock_counter = 1;
dest->prev = dest->next = NULL;
}
|
