116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include "dvb_filter.h"
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static u32 freq[4] = {480, 441, 320, 0};
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static unsigned int ac3_bitrates[32] =
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{32,40,48,56,64,80,96,112,128,160,192,224,256,320,384,448,512,576,640,
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0,0,0,0,0,0,0,0,0,0,0,0,0};
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static u32 ac3_frames[3][32] =
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{{64,80,96,112,128,160,192,224,256,320,384,448,512,640,768,896,1024,
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1152,1280,0,0,0,0,0,0,0,0,0,0,0,0,0},
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{69,87,104,121,139,174,208,243,278,348,417,487,557,696,835,975,1114,
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1253,1393,0,0,0,0,0,0,0,0,0,0,0,0,0},
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{96,120,144,168,192,240,288,336,384,480,576,672,768,960,1152,1344,
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1536,1728,1920,0,0,0,0,0,0,0,0,0,0,0,0,0}};
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int dvb_filter_get_ac3info(u8 *mbuf, int count, struct dvb_audio_info *ai, int pr)
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{
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u8 *headr;
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int found = 0;
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int c = 0;
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u8 frame = 0;
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int fr = 0;
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while ( !found && c < count){
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u8 *b = mbuf+c;
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if ( b[0] == 0x0b && b[1] == 0x77 )
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found = 1;
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else {
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c++;
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}
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}
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if (!found) return -1;
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if (pr)
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printk(KERN_DEBUG "Audiostream: AC3");
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ai->off = c;
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if (c+5 >= count) return -1;
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ai->layer = 0; // 0 for AC3
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headr = mbuf+c+2;
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frame = (headr[2]&0x3f);
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ai->bit_rate = ac3_bitrates[frame >> 1]*1000;
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if (pr)
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printk(KERN_CONT " BRate: %d kb/s", (int) ai->bit_rate/1000);
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ai->frequency = (headr[2] & 0xc0 ) >> 6;
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fr = (headr[2] & 0xc0 ) >> 6;
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ai->frequency = freq[fr]*100;
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if (pr)
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printk(KERN_CONT " Freq: %d Hz\n", (int) ai->frequency);
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ai->framesize = ac3_frames[fr][frame >> 1];
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if ((frame & 1) && (fr == 1)) ai->framesize++;
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ai->framesize = ai->framesize << 1;
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if (pr)
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printk(KERN_DEBUG " Framesize %d\n", (int) ai->framesize);
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return 0;
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}
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void dvb_filter_pes2ts_init(struct dvb_filter_pes2ts *p2ts, unsigned short pid,
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dvb_filter_pes2ts_cb_t *cb, void *priv)
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{
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unsigned char *buf=p2ts->buf;
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buf[0]=0x47;
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buf[1]=(pid>>8);
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buf[2]=pid&0xff;
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p2ts->cc=0;
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p2ts->cb=cb;
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p2ts->priv=priv;
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}
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int dvb_filter_pes2ts(struct dvb_filter_pes2ts *p2ts, unsigned char *pes,
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int len, int payload_start)
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{
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unsigned char *buf=p2ts->buf;
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int ret=0, rest;
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//len=6+((pes[4]<<8)|pes[5]);
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if (payload_start)
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buf[1]|=0x40;
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else
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buf[1]&=~0x40;
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while (len>=184) {
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buf[3]=0x10|((p2ts->cc++)&0x0f);
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memcpy(buf+4, pes, 184);
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if ((ret=p2ts->cb(p2ts->priv, buf)))
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return ret;
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len-=184; pes+=184;
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buf[1]&=~0x40;
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}
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if (!len)
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return 0;
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buf[3]=0x30|((p2ts->cc++)&0x0f);
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rest=183-len;
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if (rest) {
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buf[5]=0x00;
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if (rest-1)
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memset(buf+6, 0xff, rest-1);
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}
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buf[4]=rest;
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memcpy(buf+5+rest, pes, len);
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return p2ts->cb(p2ts->priv, buf);
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}
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