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
|
/* GStreamer
* Copyright (C) 2015 Sebastian Dröge <sebastian@centricular.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.
*/
#include "gstrtputils.h"
typedef struct
{
GstElement *element;
GstBuffer *outbuf;
GQuark copy_tag;
} CopyMetaData;
static gboolean
foreach_metadata_copy (GstBuffer * inbuf, GstMeta ** meta, gpointer user_data)
{
CopyMetaData *data = user_data;
GstElement *element = data->element;
GstBuffer *outbuf = data->outbuf;
GQuark copy_tag = data->copy_tag;
const GstMetaInfo *info = (*meta)->info;
const gchar *const *tags = gst_meta_api_type_get_tags (info->api);
if (!tags || (copy_tag != 0 && g_strv_length ((gchar **) tags) == 1
&& gst_meta_api_type_has_tag (info->api, copy_tag))) {
GstMetaTransformCopy copy_data = { FALSE, 0, -1 };
GST_DEBUG_OBJECT (element, "copy metadata %s", g_type_name (info->api));
/* simply copy then */
info->transform_func (outbuf, *meta, inbuf,
_gst_meta_transform_copy, ©_data);
} else {
GST_DEBUG_OBJECT (element, "not copying metadata %s",
g_type_name (info->api));
}
return TRUE;
}
/* TODO: Should probably make copy_tag an array at some point */
void
gst_rtp_copy_meta (GstElement * element, GstBuffer * outbuf, GstBuffer * inbuf,
GQuark copy_tag)
{
CopyMetaData data = { element, outbuf, copy_tag };
gst_buffer_foreach_meta (inbuf, foreach_metadata_copy, &data);
}
typedef struct
{
GstElement *element;
GQuark keep_tag;
} DropMetaData;
static gboolean
foreach_metadata_drop (GstBuffer * inbuf, GstMeta ** meta, gpointer user_data)
{
DropMetaData *data = user_data;
GstElement *element = data->element;
GQuark keep_tag = data->keep_tag;
const GstMetaInfo *info = (*meta)->info;
const gchar *const *tags = gst_meta_api_type_get_tags (info->api);
if (!tags || (keep_tag != 0 && g_strv_length ((gchar **) tags) == 1
&& gst_meta_api_type_has_tag (info->api, keep_tag))) {
GST_DEBUG_OBJECT (element, "keeping metadata %s", g_type_name (info->api));
} else {
GST_DEBUG_OBJECT (element, "dropping metadata %s", g_type_name (info->api));
*meta = NULL;
}
return TRUE;
}
/* TODO: Should probably make keep_tag an array at some point */
void
gst_rtp_drop_meta (GstElement * element, GstBuffer * buf, GQuark keep_tag)
{
DropMetaData data = { element, keep_tag };
gst_buffer_foreach_meta (buf, foreach_metadata_drop, &data);
}
/* Stolen from bad/gst/mpegtsdemux/payloader_parsers.c */
/* variable length Exp-Golomb parsing according to H.265 spec section 9.2*/
gboolean
gst_rtp_read_golomb (GstBitReader * br, guint32 * value)
{
guint8 b, leading_zeros = -1;
*value = 1;
for (b = 0; !b; leading_zeros++) {
if (!gst_bit_reader_get_bits_uint8 (br, &b, 1))
return FALSE;
*value *= 2;
}
*value = (*value >> 1) - 1;
if (leading_zeros > 0) {
guint32 tmp = 0;
if (!gst_bit_reader_get_bits_uint32 (br, &tmp, leading_zeros))
return FALSE;
*value += tmp;
}
return TRUE;
}
|
