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 7 static u32 freq[4] = {480, 441, 320, 0}; 8 9 static 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 13 static 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 21 int 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 70 void 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 83 int 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