From: Ralph Metzler <rjkm@xxxxxxxxxxxxxx>
> 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
#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;
}
}
