1// SPDX-License-Identifier: GPL-2.0
2#include <linux/kernel.h>
3#include <linux/module.h>
4#include <linux/string.h>
5#include "dvb_filter.h"
6
7static u32 freq[4] = {480, 441, 320, 0};
8
9static unsigned int ac3_bitrates[32] =
10 {32,40,48,56,64,80,96,112,128,160,192,224,256,320,384,448,512,576,640,
11 0,0,0,0,0,0,0,0,0,0,0,0,0};
12
13static u32 ac3_frames[3][32] =
14 {{64,80,96,112,128,160,192,224,256,320,384,448,512,640,768,896,1024,
15 1152,1280,0,0,0,0,0,0,0,0,0,0,0,0,0},
16 {69,87,104,121,139,174,208,243,278,348,417,487,557,696,835,975,1114,
17 1253,1393,0,0,0,0,0,0,0,0,0,0,0,0,0},
18 {96,120,144,168,192,240,288,336,384,480,576,672,768,960,1152,1344,
19 1536,1728,1920,0,0,0,0,0,0,0,0,0,0,0,0,0}};
20
21int dvb_filter_get_ac3info(u8 *mbuf, int count, struct dvb_audio_info *ai, int pr)
22{
23 u8 *headr;
24 int found = 0;
25 int c = 0;
26 u8 frame = 0;
27 int fr = 0;
28
29 while ( !found && c < count){
30 u8 *b = mbuf+c;
31
32 if ( b[0] == 0x0b && b[1] == 0x77 )
33 found = 1;
34 else {
35 c++;
36 }
37 }
38
39 if (!found) return -1;
40 if (pr)
41 printk(KERN_DEBUG "Audiostream: AC3");
42
43 ai->off = c;
44 if (c+5 >= count) return -1;
45
46 ai->layer = 0; // 0 for AC3
47 headr = mbuf+c+2;
48
49 frame = (headr[2]&0x3f);
50 ai->bit_rate = ac3_bitrates[frame >> 1]*1000;
51
52 if (pr)
53 printk(KERN_CONT " BRate: %d kb/s", (int) ai->bit_rate/1000);
54
55 ai->frequency = (headr[2] & 0xc0 ) >> 6;
56 fr = (headr[2] & 0xc0 ) >> 6;
57 ai->frequency = freq[fr]*100;
58 if (pr)
59 printk(KERN_CONT " Freq: %d Hz\n", (int) ai->frequency);
60
61 ai->framesize = ac3_frames[fr][frame >> 1];
62 if ((frame & 1) && (fr == 1)) ai->framesize++;
63 ai->framesize = ai->framesize << 1;
64 if (pr)
65 printk(KERN_DEBUG " Framesize %d\n", (int) ai->framesize);
66
67 return 0;
68}
69
70void dvb_filter_pes2ts_init(struct dvb_filter_pes2ts *p2ts, unsigned short pid,
71 dvb_filter_pes2ts_cb_t *cb, void *priv)
72{
73 unsigned char *buf=p2ts->buf;
74
75 buf[0]=0x47;
76 buf[1]=(pid>>8);
77 buf[2]=pid&0xff;
78 p2ts->cc=0;
79 p2ts->cb=cb;
80 p2ts->priv=priv;
81}
82
83int dvb_filter_pes2ts(struct dvb_filter_pes2ts *p2ts, unsigned char *pes,
84 int len, int payload_start)
85{
86 unsigned char *buf=p2ts->buf;
87 int ret=0, rest;
88
89 //len=6+((pes[4]<<8)|pes[5]);
90
91 if (payload_start)
92 buf[1]|=0x40;
93 else
94 buf[1]&=~0x40;
95 while (len>=184) {
96 buf[3]=0x10|((p2ts->cc++)&0x0f);
97 memcpy(buf+4, pes, 184);
98 if ((ret=p2ts->cb(p2ts->priv, buf)))
99 return ret;
100 len-=184; pes+=184;
101 buf[1]&=~0x40;
102 }
103 if (!len)
104 return 0;
105 buf[3]=0x30|((p2ts->cc++)&0x0f);
106 rest=183-len;
107 if (rest) {
108 buf[5]=0x00;
109 if (rest-1)
110 memset(buf+6, 0xff, rest-1);
111 }
112 buf[4]=rest;
113 memcpy(buf+5+rest, pes, len);
114 return p2ts->cb(p2ts->priv, buf);
115}
116

source code of linux/drivers/staging/media/av7110/dvb_filter.c