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
|
/**
* Common code for the RTP depacketization of MPEG-4 formats.
* Copyright (c) 2010 Fabrice Bellard
* Romain Degez
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* @brief MPEG4 / RTP Code
* @author Fabrice Bellard
* @author Romain Degez
*/
#include "rtpdec_mpeg4.h"
#include "internal.h"
#include "libavutil/avstring.h"
#include <strings.h>
#include "rtsp.h" //XXX remove this dependency
/* return the length and optionally the data */
static int hex_to_data(uint8_t *data, const char *p)
{
int c, len, v;
len = 0;
v = 1;
for (;;) {
p += strspn(p, SPACE_CHARS);
if (*p == '\0')
break;
c = toupper((unsigned char) *p++);
if (c >= '0' && c <= '9')
c = c - '0';
else if (c >= 'A' && c <= 'F')
c = c - 'A' + 10;
else
break;
v = (v << 4) | c;
if (v & 0x100) {
if (data)
data[len] = v;
len++;
v = 1;
}
}
return len;
}
typedef struct {
const char *str;
uint16_t type;
uint32_t offset;
} AttrNameMap;
/* All known fmtp parameters and the corresponding RTPAttrTypeEnum */
#define ATTR_NAME_TYPE_INT 0
#define ATTR_NAME_TYPE_STR 1
static const AttrNameMap attr_names[]=
{
{ "SizeLength", ATTR_NAME_TYPE_INT,
offsetof(RTPPayloadData, sizelength) },
{ "IndexLength", ATTR_NAME_TYPE_INT,
offsetof(RTPPayloadData, indexlength) },
{ "IndexDeltaLength", ATTR_NAME_TYPE_INT,
offsetof(RTPPayloadData, indexdeltalength) },
{ "profile-level-id", ATTR_NAME_TYPE_INT,
offsetof(RTPPayloadData, profile_level_id) },
{ "StreamType", ATTR_NAME_TYPE_INT,
offsetof(RTPPayloadData, streamtype) },
{ "mode", ATTR_NAME_TYPE_STR,
offsetof(RTPPayloadData, mode) },
{ NULL, -1, -1 },
};
static int parse_fmtp_config(AVCodecContext * codec, char *value)
{
/* decode the hexa encoded parameter */
int len = hex_to_data(NULL, value);
if (codec->extradata)
av_free(codec->extradata);
codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
if (!codec->extradata)
return AVERROR(ENOMEM);
codec->extradata_size = len;
hex_to_data(codec->extradata, value);
return 0;
}
static int parse_sdp_line(AVFormatContext *s, int st_index,
PayloadContext *data, const char *line)
{
const char *p;
char value[4096], attr[25];
int res = 0, i;
AVStream *st = s->streams[st_index];
RTSPStream *rtsp_st = st->priv_data;
AVCodecContext* codec = st->codec;
RTPPayloadData *rtp_payload_data = &rtsp_st->rtp_payload_data;
if (av_strstart(line, "fmtp:", &p)) {
// remove protocol identifier
while (*p && *p == ' ') p++; // strip spaces
while (*p && *p != ' ') p++; // eat protocol identifier
while (*p && *p == ' ') p++; // strip trailing spaces
while (ff_rtsp_next_attr_and_value(&p,
attr, sizeof(attr),
value, sizeof(value))) {
if (!strcmp(attr, "config")) {
res = parse_fmtp_config(codec, value);
if (res < 0)
return res;
}
if (codec->codec_id == CODEC_ID_AAC) {
/* Looking for a known attribute */
for (i = 0; attr_names[i].str; ++i) {
if (!strcasecmp(attr, attr_names[i].str)) {
if (attr_names[i].type == ATTR_NAME_TYPE_INT) {
*(int *)((char *)rtp_payload_data +
attr_names[i].offset) = atoi(value);
} else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
*(char **)((char *)rtp_payload_data +
attr_names[i].offset) = av_strdup(value);
}
}
}
}
}
return 0;
}
RTPDynamicProtocolHandler ff_mp4v_es_dynamic_handler = {
.enc_name = "MP4V-ES",
.codec_type = AVMEDIA_TYPE_VIDEO,
.codec_id = CODEC_ID_MPEG4,
.parse_sdp_a_line = parse_sdp_line,
.open = NULL,
.close = NULL,
.parse_packet = NULL
};
RTPDynamicProtocolHandler ff_mpeg4_generic_dynamic_handler = {
.enc_name = "mpeg4-generic",
.codec_type = AVMEDIA_TYPE_AUDIO,
.codec_id = CODEC_ID_AAC,
.parse_sdp_a_line = parse_sdp_line,
.open = NULL,
.close = NULL,
.parse_packet = NULL
};
|
