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
|
/*
* set of helper routines for building MPEG 1/2 PS/PES packets
*
* Copyright (C) 2006 Benjamin Zores
*
* Based on code borrowed from vo_mpegpes/vo_dxr2:
* (C) 2000 Ralph Metzler <ralph@convergence.de>
* Marcus Metzler <marcus@convergence.de>
* Gerard Lantau
*
* This file is part of MPlayer.
*
* MPlayer 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.
*
* MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <unistd.h>
#include <string.h>
#include <inttypes.h>
#include "mp_msg.h"
#include "mpeg_packetizer.h"
#define PES_MAX_SIZE 2048
static const unsigned char ps2_header[] = {
0x00, 0x00, 0x01, 0xba, 0x44, 0x00, 0x04, 0x00,
0x04, 0x01, 0x01, 0x86, 0xa3, 0xf8
};
static const unsigned char ps1_header[] = {
0x00, 0x00, 0x01, 0xba, 0x21, 0x00,
0xb9, 0x37, 0x83, 0x80, 0xc3, 0x51,
};
/* Send MPEG <type> PES packet */
static int
send_mpeg_pes_packet_ll(unsigned char *data, int len, int id, uint64_t pts,
int type, unsigned char *header, int header_len,
int align4, int my_write (const unsigned char *data, int len))
{
int ptslen = (pts ? 5 : 0);
int n = 0;
int idx, plen;
int hdr;
unsigned char pes_header[PES_MAX_SIZE];
mp_msg (MSGT_HEADER, MSGL_DBG2,
"MPEG%d PES packet: 0x%x => %"PRIu64" \n", type, id, pts);
memset (pes_header, '\0', PES_MAX_SIZE);
/* startcode */
pes_header[0] = 0;
pes_header[1] = 0;
pes_header[2] = 0x01;
pes_header[3] = id; /* stream id */
while (len > 0)
{
int payload_size = len; /* data + PTS */
if(type == 2)
hdr = 3;
else
hdr = (ptslen ? 0 : 1);
if (6 + hdr + ptslen + payload_size + header_len > PES_MAX_SIZE)
payload_size = PES_MAX_SIZE - 6 - hdr - ptslen - header_len;
if(align4)
payload_size &= ~3;
/* construct PES header: packetize */
plen = payload_size + hdr + ptslen + header_len;
pes_header[4] = plen >> 8;
pes_header[5] = plen & 255;
idx = 6;
if (ptslen)
{
int x;
if(type == 2)
{
pes_header[idx++] = 0x81;
pes_header[idx++] = 0x80;
pes_header[idx++] = ptslen;
}
/* presentation time stamp */
x = (0x02 << 4) | (((pts >> 30) & 0x07) << 1) | 1;
pes_header[idx++] = x;
x = ((((pts >> 15) & 0x7fff) << 1) | 1);
pes_header[idx++] = x >>8;
pes_header[idx++] = x & 255;
x = (((pts & 0x7fff) << 1) | 1);
pes_header[idx++] = x >> 8;
pes_header[idx++] = x & 255;
}
else
{
if(type == 2)
{
pes_header[idx++] = 0x81;
pes_header[idx++] = 0x00;
pes_header[idx++] = 0x00;
}
else
pes_header[idx++] = 0x0f;
}
if(header_len)
{
memcpy(&pes_header[idx], header, header_len);
idx += header_len;
}
my_write (pes_header, idx);
n = my_write (data, payload_size);
len -= n;
data += n;
ptslen = 0; /* store PTS only once, at first packet! */
if(align4 && len < 4)
break;
}
return n;
}
int
send_mpeg_pes_packet (unsigned char *data, int len, int id, uint64_t pts,
int type, int my_write (const unsigned char *data, int len))
{
return send_mpeg_pes_packet_ll(data, len, id, pts, type, NULL, 0, 0, my_write);
}
/* Send MPEG <type> PS packet */
int
send_mpeg_ps_packet(unsigned char *data, int len, int id, uint64_t pts, int type,
int my_write (const unsigned char *data, int len))
{
if(type == 2)
my_write (ps2_header, sizeof (ps2_header));
else
my_write (ps1_header, sizeof (ps1_header));
return send_mpeg_pes_packet (data, len, id, pts, type, my_write);
}
/* Send MPEG 2 LPCM packet */
int
send_mpeg_lpcm_packet(unsigned char* data, int len,
int id, uint64_t pts, int freq_id,
int my_write (const unsigned char *data, int len))
{
unsigned char header[7] = {0xA0, 0x07, 0x00, 0x04, 0x0C, 1 | (freq_id << 4), 0x80};
return send_mpeg_pes_packet_ll(data, len, 0xBD, pts, 2, header, sizeof(header), 1, my_write);
}
|
