diff options
Diffstat (limited to 'drivers/staging/media/deprecated/saa7146/av7110/dvb_filter.c')
-rw-r--r-- | drivers/staging/media/deprecated/saa7146/av7110/dvb_filter.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/drivers/staging/media/deprecated/saa7146/av7110/dvb_filter.c b/drivers/staging/media/deprecated/saa7146/av7110/dvb_filter.c new file mode 100644 index 000000000000..8c2eca5dcdc9 --- /dev/null +++ b/drivers/staging/media/deprecated/saa7146/av7110/dvb_filter.c @@ -0,0 +1,115 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/string.h> +#include "dvb_filter.h" + +static u32 freq[4] = {480, 441, 320, 0}; + +static unsigned int ac3_bitrates[32] = + {32,40,48,56,64,80,96,112,128,160,192,224,256,320,384,448,512,576,640, + 0,0,0,0,0,0,0,0,0,0,0,0,0}; + +static u32 ac3_frames[3][32] = + {{64,80,96,112,128,160,192,224,256,320,384,448,512,640,768,896,1024, + 1152,1280,0,0,0,0,0,0,0,0,0,0,0,0,0}, + {69,87,104,121,139,174,208,243,278,348,417,487,557,696,835,975,1114, + 1253,1393,0,0,0,0,0,0,0,0,0,0,0,0,0}, + {96,120,144,168,192,240,288,336,384,480,576,672,768,960,1152,1344, + 1536,1728,1920,0,0,0,0,0,0,0,0,0,0,0,0,0}}; + +int dvb_filter_get_ac3info(u8 *mbuf, int count, struct dvb_audio_info *ai, int pr) +{ + u8 *headr; + int found = 0; + int c = 0; + u8 frame = 0; + int fr = 0; + + while ( !found && c < count){ + u8 *b = mbuf+c; + + if ( b[0] == 0x0b && b[1] == 0x77 ) + found = 1; + else { + c++; + } + } + + if (!found) return -1; + if (pr) + printk(KERN_DEBUG "Audiostream: AC3"); + + ai->off = c; + if (c+5 >= count) return -1; + + ai->layer = 0; // 0 for AC3 + headr = mbuf+c+2; + + frame = (headr[2]&0x3f); + ai->bit_rate = ac3_bitrates[frame >> 1]*1000; + + if (pr) + printk(KERN_CONT " BRate: %d kb/s", (int) ai->bit_rate/1000); + + ai->frequency = (headr[2] & 0xc0 ) >> 6; + fr = (headr[2] & 0xc0 ) >> 6; + ai->frequency = freq[fr]*100; + if (pr) + printk(KERN_CONT " Freq: %d Hz\n", (int) ai->frequency); + + ai->framesize = ac3_frames[fr][frame >> 1]; + if ((frame & 1) && (fr == 1)) ai->framesize++; + ai->framesize = ai->framesize << 1; + if (pr) + printk(KERN_DEBUG " Framesize %d\n", (int) ai->framesize); + + return 0; +} + +void dvb_filter_pes2ts_init(struct dvb_filter_pes2ts *p2ts, unsigned short pid, + dvb_filter_pes2ts_cb_t *cb, void *priv) +{ + unsigned char *buf=p2ts->buf; + + buf[0]=0x47; + buf[1]=(pid>>8); + buf[2]=pid&0xff; + p2ts->cc=0; + p2ts->cb=cb; + p2ts->priv=priv; +} + +int dvb_filter_pes2ts(struct dvb_filter_pes2ts *p2ts, unsigned char *pes, + int len, int payload_start) +{ + unsigned char *buf=p2ts->buf; + int ret=0, rest; + + //len=6+((pes[4]<<8)|pes[5]); + + if (payload_start) + buf[1]|=0x40; + else + buf[1]&=~0x40; + while (len>=184) { + buf[3]=0x10|((p2ts->cc++)&0x0f); + memcpy(buf+4, pes, 184); + if ((ret=p2ts->cb(p2ts->priv, buf))) + return ret; + len-=184; pes+=184; + buf[1]&=~0x40; + } + if (!len) + return 0; + buf[3]=0x30|((p2ts->cc++)&0x0f); + rest=183-len; + if (rest) { + buf[5]=0x00; + if (rest-1) + memset(buf+6, 0xff, rest-1); + } + buf[4]=rest; + memcpy(buf+5+rest, pes, len); + return p2ts->cb(p2ts->priv, buf); +} |