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* Re: DVB nGene CI : TS Discontinuities issues
@ 2011-05-11 13:12 Issa Gorissen
  2011-05-11 13:35 ` Sébastien RAILLARD (COEXSI)
  2011-05-12 20:40 ` Issa Gorissen
  0 siblings, 2 replies; 7+ messages in thread
From: Issa Gorissen @ 2011-05-11 13:12 UTC (permalink / raw)
  To: Ralph Metzler
  Cc: Linux Media Mailing List, S-bastien RAILLARD, Oliver Endriss

[-- Attachment #1: Type: text/plain, Size: 2071 bytes --]

From: Ralph Metzler <rjkm@metzlerbros.de>
> Issa Gorissen writes:
>  > Could you please take a look at the cxd2099 issues ?
>  > 
>  > I have attached a version with my changes. I have tested a lot of
>  > different settings with the help of the chip datasheet.
>  > 
>  > Scrambled programs are not handled correctly. I don't know if it is the
>  > TICLK/MCLKI which is too high or something, or the sync detector ? Also,
>  > as we have to set the TOCLK to max of 72MHz, there are way too much null
>  > packets added. Is there a way to solve this ?
> 
> I do not have any cxd2099 issues.
> I have a simple test program which includes a 32bit counter as payload 
> and can pump data through the CI with full speed and have no packet
> loss. I only tested decoding with an ORF stream and an Alphacrypt CAM
> but also had no problems with this.
> 
> Please take care not to write data faster than it is read. Starting two
> dds will not guarantee this. To be certain you could write a small
> program which never writes more packets than input buffer size minus
> the number of read packets (and minus the stuffing null packets on ngene).
> 
> Before blaming packet loss on the CI data path also please make
> certain that you have no buffer overflows in the input part of 
> the sec device.
> In the ngene driver you can e.g. add a printk in tsin_exchange():
> 
> if (dvb_ringbuffer_free(&dev->tsin_rbuf) > len) {
> ...
> } else
>     printk ("buffer overflow !!!!\n");
> 
> 
> Regards,
> Ralph


Ralph,

Please find my testing tool for the decryption attached. The idea is to write
5 packets and read them back from the CAM.

My input is a raw ts captured with a gnutv I modified with a demux filter of
0x2000. Gnutv outputs at dvr and dvbloop reads from it, process via sec0 and
writes output to a file.

The channel I selected has been decrypted. Only problem is I have artifacts in
the image and the sound.

Do you have any idea of what I should improve from my test tool to fix that
issue ?


Thx,
--
Issa


[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: dvbloop.c --]
[-- Type: text/x-csrc; name="dvbloop.c", Size: 2445 bytes --]

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <time.h>

static void signal_handler(int _signal);
static int quit_app = 0;

int main(int argc, char *argv[])
{
	signal(SIGINT, signal_handler);

	if (argc <= 3)
		exit(1);	

	int in_fd = open(argv[1], O_RDONLY);
	int out_fd = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
	int tsi_fd = open(argv[3], O_RDWR);

	int rlen = 0;
	int wlen = 0;
	int rtsilen = 0;
	int wtsilen = 0;

	int BUFFY = 188 * 5;
	unsigned char buf[BUFFY];
	struct timespec sl[1];
	sl[0].tv_nsec = 250000;
	
	while (!quit_app)
	{
		// read from input (DVR or other)
		rlen = 0;
		while (rlen < BUFFY) {
			int i = read(in_fd, buf + rlen, BUFFY - rlen);
			if (!i) {
				quit_app = 1;
				continue;
			}
			rlen += i;
		}
		
		// write data to caio device
		wlen = write(tsi_fd, buf, rlen);
		if (wlen != rlen)
		{
			perror("Did not write same amount of data from input to caio!!!");
			exit(1);
		}/* else
			printf("written %d bytes in tsi\n", wlen);
	*/

		// read data from caio device - should be decrypted
		// finding sync byte
		do {
			buf[0] = 0;
			while (buf[0] != 0x47) {
				rtsilen = read(tsi_fd, buf, 1);
			}
			
			if (buf[0] == 0x47) {
				do {
					int i = read(tsi_fd, buf + rtsilen, 188 - rtsilen);
					rtsilen += i;
//					printf("reading %d bytes from tsi\n", i);
				} while (rtsilen < 188);

				break;
			}
		} while (1);

//printf("sync byte found: %02x \n", buf[0]);

		wtsilen = 0;
		int nulls = 0;
		do {
			if (buf[0] == 0x47 && buf[1] == 0x1F && buf[2] == 0xFF) {
				++nulls;
				if (nulls > 100)
					break;

//				printf("null packet ");
				// DVB null packet, discard
			} else {
//			printf("\nfrom tsi out: %x %x %x \n", buf[0], buf[1], buf[2]);
				// write packet to output
				int i = write(out_fd, buf, 188);
				if (i < 188) {
					perror("Did not write 188 bytes to output file!!!");
				}
				wtsilen += i;
			}

			if (rlen == wtsilen || quit_app)
				break;

			rtsilen = 0;
			do {
				rtsilen += read(tsi_fd, buf + rtsilen, 188 - rtsilen);
			} while (rtsilen < 188);
		} while (1);
	}

	close(in_fd);
	close(out_fd);
	close(tsi_fd);

	exit(0);
}


static void signal_handler(int _signal)
{
	if (!quit_app)
	{
		quit_app = 1;
	}
}

^ permalink raw reply	[flat|nested] 7+ messages in thread
end of thread, other threads:[~2012-02-26 22:43 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2011-05-11 13:12 DVB nGene CI : TS Discontinuities issues Issa Gorissen
2011-05-11 13:35 ` Sébastien RAILLARD (COEXSI)
2011-05-12 20:40 ` Issa Gorissen
2011-05-13 11:54   ` Ralph Metzler
2012-02-26 17:11     ` Anssi Hannula
2012-02-26 22:14       ` Ralph Metzler
2012-02-26 22:43         ` cxd2099 CI on DDBridge not working (was: Re: DVB nGene CI : TS Discontinuities issues) Anssi Hannula

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