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
|
/*
* MPEG-ES video parser
*
* 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 <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "config.h"
#include "core/mp_msg.h"
#include "stream/stream.h"
#include "demux.h"
#include "parse_es.h"
//static unsigned char videobuffer[MAX_VIDEO_PACKET_SIZE];
unsigned char* videobuffer=NULL;
int videobuf_len=0;
int next_nal = -1;
///! legacy variable, 4 if stream is synced, 0 if not
int videobuf_code_len=0;
#define MAX_SYNCLEN (10 * 1024 * 1024)
// sync video stream, and returns next packet code
int sync_video_packet(demux_stream_t *ds){
if (!videobuf_code_len) {
int skipped=0;
if (!demux_pattern_3(ds, NULL, MAX_SYNCLEN, &skipped, 0x100)) {
if (skipped == MAX_SYNCLEN)
mp_msg(MSGT_DEMUXER, MSGL_ERR, "parse_es: could not sync video stream!\n");
goto eof_out;
}
next_nal = demux_getc(ds);
if (next_nal < 0)
goto eof_out;
videobuf_code_len = 4;
if(skipped) mp_dbg(MSGT_PARSEES,MSGL_DBG2,"videobuf: %d bytes skipped (next: 0x1%02X)\n",skipped,next_nal);
}
return 0x100|next_nal;
eof_out:
next_nal = -1;
videobuf_code_len = 0;
return 0;
}
// return: packet length
int read_video_packet(demux_stream_t *ds){
int packet_start;
int res, read;
if (VIDEOBUFFER_SIZE - videobuf_len < 5)
return 0;
// SYNC STREAM
// if(!sync_video_packet(ds)) return 0; // cannot sync (EOF)
// COPY STARTCODE:
packet_start=videobuf_len;
videobuffer[videobuf_len+0]=0;
videobuffer[videobuf_len+1]=0;
videobuffer[videobuf_len+2]=1;
videobuffer[videobuf_len+3]=next_nal;
videobuf_len+=4;
// READ PACKET:
res = demux_pattern_3(ds, &videobuffer[videobuf_len],
VIDEOBUFFER_SIZE - videobuf_len, &read, 0x100);
videobuf_len += read;
if (!res)
goto eof_out;
videobuf_len-=3;
mp_dbg(MSGT_PARSEES,MSGL_DBG2,"videobuf: packet 0x1%02X len=%d (total=%d)\n",videobuffer[packet_start+3],videobuf_len-packet_start,videobuf_len);
// Save next packet code:
next_nal = demux_getc(ds);
if (next_nal < 0)
goto eof_out;
videobuf_code_len=4;
return videobuf_len-packet_start;
eof_out:
next_nal = -1;
videobuf_code_len = 0;
return videobuf_len - packet_start;
}
// return: next packet code
int skip_video_packet(demux_stream_t *ds){
// SYNC STREAM
// if(!sync_video_packet(ds)) return 0; // cannot sync (EOF)
videobuf_code_len=0; // force resync
// SYNC AGAIN:
return sync_video_packet(ds);
}
/* stripped down version of a52_syncinfo() from liba52
* copyright belongs to Michel Lespinasse <walken@zoy.org>
* and Aaron Holtzman <aholtzma@ess.engr.uvic.ca> */
int mp_a52_framesize(uint8_t * buf, int *srate)
{
int rate[] = { 32, 40, 48, 56, 64, 80, 96, 112,
128, 160, 192, 224, 256, 320, 384, 448,
512, 576, 640
};
uint8_t halfrate[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3 };
int frmsizecod, bitrate, half;
if ((buf[0] != 0x0b) || (buf[1] != 0x77)) /* syncword */
return 0;
if (buf[5] >= 0x60) /* bsid >= 12 */
return 0;
half = halfrate[buf[5] >> 3];
frmsizecod = buf[4] & 63;
if (frmsizecod >= 38)
return 0;
bitrate = rate[frmsizecod >> 1];
switch (buf[4] & 0xc0) {
case 0: /* 48 KHz */
*srate = 48000 >> half;
return 4 * bitrate;
case 0x40: /* 44.1 KHz */
*srate = 44100 >> half;
return 2 * (320 * bitrate / 147 + (frmsizecod & 1));
case 0x80: /* 32 KHz */
*srate = 32000 >> half;
return 6 * bitrate;
}
return 0;
}
|
