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authorHenrik Kurelid <henke@kurelid.se>2009-08-01 08:02:38 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-09-12 12:19:08 -0300
commit166987c6987a25a95cef6889d24088f0eb2daa36 (patch)
treea10a778f99f993fc348ba783d361037f09d5bdc6 /drivers/media/dvb
parent114323ede9e84a64327b74ff6f7da5576c9ae361 (diff)
V4L/DVB (12482): firedtv: add PID filtering for SW zigzag retune
The AVC protocol uses the same command for tuning and PID filtering and since dvb-core uses a software zigzagging to do automatic retuning this could cause all PID filters to be cleared. PID filter information is now included in all DSD commands to the card. Background: There is a problem in the firedtv driver that causes recordings to stop if the SW zigzag algorithm in dvb-core kicks in with a retune after the application has set up the PID filters. Since tuning and setting PID filters uses the same AVC command (DSD) and only the replace subfunction is supported by the card, it is not possible to do a retune without setting the PID filters. This means that the PID filtering has to be sent in each tune. This problem applies to C and T cards since S and S2 cards tune using a vendor specific command. The patch corrects the problem by sending the PID list in each tune. I have tested it on my T card with a good result. How to trigger problem: Zap to a channel and output AV to a file, e.g. "tzap -c channels.conf SVT1 -r -o SVT1.ts". After a short while, pull the antenna cable from the card. The lock on the channel will disappear and the TS file will stop increasing in size. Wait a couple of seconds. Replug the cable again. You will get a lock on the channel again, but the TS file will never increase in size agains sinze no PIDS are filtered. Tested with kaffeine with DVB-T and DVB-C: Fixes retuning after antenna was plugged out and back in with DVB-T. Does not fix this with DVB-C, but also doesn't regress on DVB-C. Signed-off-by: Henrik Kurelid <henrik@kurelid.se> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/dvb')
-rw-r--r--drivers/media/dvb/firewire/firedtv-avc.c40
1 files changed, 30 insertions, 10 deletions
diff --git a/drivers/media/dvb/firewire/firedtv-avc.c b/drivers/media/dvb/firewire/firedtv-avc.c
index 32526f103b5..1a94c6bb601 100644
--- a/drivers/media/dvb/firewire/firedtv-avc.c
+++ b/drivers/media/dvb/firewire/firedtv-avc.c
@@ -254,6 +254,26 @@ int avc_recv(struct firedtv *fdtv, void *data, size_t length)
return 0;
}
+static int add_pid_filter(struct firedtv *fdtv, u8 *operand)
+{
+ int i, n, pos = 1;
+
+ for (i = 0, n = 0; i < 16; i++) {
+ if (test_bit(i, &fdtv->channel_active)) {
+ operand[pos++] = 0x13; /* flowfunction relay */
+ operand[pos++] = 0x80; /* dsd_sel_spec_valid_flags -> PID */
+ operand[pos++] = (fdtv->channel_pid[i] >> 8) & 0x1f;
+ operand[pos++] = fdtv->channel_pid[i] & 0xff;
+ operand[pos++] = 0x00; /* tableID */
+ operand[pos++] = 0x00; /* filter_length */
+ n++;
+ }
+ }
+ operand[0] = n;
+
+ return pos;
+}
+
/*
* tuning command for setting the relative LNB frequency
* (not supported by the AVC standard)
@@ -316,7 +336,8 @@ static void avc_tuner_tuneqpsk(struct firedtv *fdtv,
}
}
-static void avc_tuner_dsd_dvb_c(struct dvb_frontend_parameters *params,
+static void avc_tuner_dsd_dvb_c(struct firedtv *fdtv,
+ struct dvb_frontend_parameters *params,
struct avc_command_frame *c)
{
c->opcode = AVC_OPCODE_DSD;
@@ -378,13 +399,13 @@ static void avc_tuner_dsd_dvb_c(struct dvb_frontend_parameters *params,
c->operand[20] = 0x00;
c->operand[21] = 0x00;
- /* Nr_of_dsd_sel_specs = 0 -> no PIDs are transmitted */
- c->operand[22] = 0x00;
- c->length = 28;
+ /* Add PIDs to filter */
+ c->length = ALIGN(22 + add_pid_filter(fdtv, &c->operand[22]) + 3, 4);
}
-static void avc_tuner_dsd_dvb_t(struct dvb_frontend_parameters *params,
+static void avc_tuner_dsd_dvb_t(struct firedtv *fdtv,
+ struct dvb_frontend_parameters *params,
struct avc_command_frame *c)
{
struct dvb_ofdm_parameters *ofdm = &params->u.ofdm;
@@ -481,10 +502,9 @@ static void avc_tuner_dsd_dvb_t(struct dvb_frontend_parameters *params,
c->operand[15] = 0x00; /* network_ID[0] */
c->operand[16] = 0x00; /* network_ID[1] */
- /* Nr_of_dsd_sel_specs = 0 -> no PIDs are transmitted */
- c->operand[17] = 0x00;
- c->length = 24;
+ /* Add PIDs to filter */
+ c->length = ALIGN(17 + add_pid_filter(fdtv, &c->operand[17]) + 3, 4);
}
int avc_tuner_dsd(struct firedtv *fdtv,
@@ -502,8 +522,8 @@ int avc_tuner_dsd(struct firedtv *fdtv,
switch (fdtv->type) {
case FIREDTV_DVB_S:
case FIREDTV_DVB_S2: avc_tuner_tuneqpsk(fdtv, params, c); break;
- case FIREDTV_DVB_C: avc_tuner_dsd_dvb_c(params, c); break;
- case FIREDTV_DVB_T: avc_tuner_dsd_dvb_t(params, c); break;
+ case FIREDTV_DVB_C: avc_tuner_dsd_dvb_c(fdtv, params, c); break;
+ case FIREDTV_DVB_T: avc_tuner_dsd_dvb_t(fdtv, params, c); break;
default:
BUG();
}