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[media] ngene: Strip dummy packets inserted by the driver 

As the CI requires a continuous data stream, the driver inserts dummy
packets when necessary. Do not pass these packets to userspace anymore.

Signed-off-by: Oliver Endriss <o.endriss@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Oliver Endriss 2011-07-03 14:04:46 -03:00 committed by Mauro Carvalho Chehab
parent 3b2cfd6e1a
commit 36e3fc8957
3 changed files with 39 additions and 7 deletions
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2
drivers/media/dvb/ngene/ngene-core.c
View File

@ -507,7 +507,7 @@ void FillTSBuffer(void *Buffer, int Length, u32 Flags)
{
u32 *ptr = Buffer;
memset(Buffer, 0xff, Length);
memset(Buffer, TS_FILLER, Length);
while (Length > 0) {
if (Flags & DF_SWAP32)
*ptr = 0x471FFF10;

42
drivers/media/dvb/ngene/ngene-dvb.c
View File

@ -118,6 +118,16 @@ static void swap_buffer(u32 *p, u32 len)
}
}
/* start of filler packet */
static u8 fill_ts[] = { 0x47, 0x1f, 0xff, 0x10, TS_FILLER };
/* #define DEBUG_CI_XFER */
#ifdef DEBUG_CI_XFER
static u32 ok;
static u32 overflow;
static u32 stripped;
#endif
void *tsin_exchange(void *priv, void *buf, u32 len, u32 clock, u32 flags)
{
struct ngene_channel *chan = priv;
@ -126,21 +136,41 @@ void *tsin_exchange(void *priv, void *buf, u32 len, u32 clock, u32 flags)
if (flags & DF_SWAP32)
swap_buffer(buf, len);
if (dev->ci.en && chan->number == 2) {
if (dvb_ringbuffer_free(&dev->tsin_rbuf) > len) {
dvb_ringbuffer_write(&dev->tsin_rbuf, buf, len);
wake_up_interruptible(&dev->tsin_rbuf.queue);
while (len >= 188) {
if (memcmp(buf, fill_ts, sizeof fill_ts) != 0) {
if (dvb_ringbuffer_free(&dev->tsin_rbuf) >= 188) {
dvb_ringbuffer_write(&dev->tsin_rbuf, buf, 188);
wake_up(&dev->tsin_rbuf.queue);
#ifdef DEBUG_CI_XFER
ok++;
#endif
}
return 0;
#ifdef DEBUG_CI_XFER
else
overflow++;
#endif
}
#ifdef DEBUG_CI_XFER
else
stripped++;
if (ok % 100 == 0 && overflow)
printk(KERN_WARNING "%s: ok %u overflow %u dropped %u\n", __func__, ok, overflow, stripped);
#endif
buf += 188;
len -= 188;
}
return NULL;
}
if (chan->users > 0)
dvb_dmx_swfilter(&chan->demux, buf, len);
return NULL;
}
u8 fill_ts[188] = { 0x47, 0x1f, 0xff, 0x10 };
void *tsout_exchange(void *priv, void *buf, u32 len, u32 clock, u32 flags)
{
struct ngene_channel *chan = priv;

2
drivers/media/dvb/ngene/ngene.h
View File

@ -789,6 +789,8 @@ struct ngene {
u8 uart_rbuf[UART_RBUF_LEN];
int uart_rp, uart_wp;
#define TS_FILLER 0x6f
u8 *tsout_buf;
#define TSOUT_BUF_SIZE (512*188*8)
struct dvb_ringbuffer tsout_rbuf;