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authorAbylay Ospan <aospan@netup.ru>2009-06-06 09:31:34 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-06-16 19:07:23 -0300
commit0d834635a35a98d0dced54da7695ccab4464854d (patch)
tree35f9e0e40491abd348d99fc471aa4164bb6b7ff4 /drivers/media/dvb
parentd6a9a430a63adac71f2d23d4eb8f4eb467fc82c2 (diff)
V4L/DVB (11930): TS continuity check: show error message when discontinuity detected or TEI flag detected in header
Signed-off-by: Abylay Ospan <aospan@netup.ru> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/dvb')
-rw-r--r--drivers/media/dvb/dvb-core/dvb_demux.c42
-rw-r--r--drivers/media/dvb/dvb-core/dvb_demux.h4
2 files changed, 46 insertions, 0 deletions
diff --git a/drivers/media/dvb/dvb-core/dvb_demux.c b/drivers/media/dvb/dvb-core/dvb_demux.c
index e2eca0b1fe7..cfe2768d24a 100644
--- a/drivers/media/dvb/dvb-core/dvb_demux.c
+++ b/drivers/media/dvb/dvb-core/dvb_demux.c
@@ -38,6 +38,16 @@
*/
// #define DVB_DEMUX_SECTION_LOSS_LOG
+static int dvb_demux_tscheck;
+module_param(dvb_demux_tscheck, int, 0644);
+MODULE_PARM_DESC(dvb_demux_tscheck,
+ "enable transport stream continuity and TEI check");
+
+#define dprintk_tscheck(x...) do { \
+ if (dvb_demux_tscheck && printk_ratelimit()) \
+ printk(x); \
+ } while (0)
+
/******************************************************************************
* static inlined helper functions
******************************************************************************/
@@ -376,6 +386,36 @@ static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf)
u16 pid = ts_pid(buf);
int dvr_done = 0;
+ if (dvb_demux_tscheck) {
+ if (!demux->cnt_storage)
+ demux->cnt_storage = vmalloc(MAX_PID + 1);
+
+ if (!demux->cnt_storage) {
+ printk(KERN_WARNING "Couldn't allocate memory for TS/TEI check. Disabling it\n");
+ dvb_demux_tscheck = 0;
+ goto no_dvb_demux_tscheck;
+ }
+
+ /* check pkt counter */
+ if (pid < MAX_PID) {
+ if (buf[1] & 0x80)
+ dprintk_tscheck("TEI detected. "
+ "PID=0x%x data1=0x%x\n",
+ pid, buf[1]);
+
+ if ((buf[3] & 0xf) != demux->cnt_storage[pid])
+ dprintk_tscheck("TS packet counter mismatch. "
+ "PID=0x%x expected 0x%x "
+ "got 0x%x\n",
+ pid, demux->cnt_storage[pid],
+ buf[3] & 0xf);
+
+ demux->cnt_storage[pid] = ((buf[3] & 0xf) + 1)&0xf;
+ };
+ /* end check */
+ };
+no_dvb_demux_tscheck:
+
list_for_each_entry(feed, &demux->feed_list, list_head) {
if ((feed->pid != pid) && (feed->pid != 0x2000))
continue;
@@ -1160,6 +1200,7 @@ int dvb_dmx_init(struct dvb_demux *dvbdemux)
int i;
struct dmx_demux *dmx = &dvbdemux->dmx;
+ dvbdemux->cnt_storage = NULL;
dvbdemux->users = 0;
dvbdemux->filter = vmalloc(dvbdemux->filternum * sizeof(struct dvb_demux_filter));
@@ -1226,6 +1267,7 @@ EXPORT_SYMBOL(dvb_dmx_init);
void dvb_dmx_release(struct dvb_demux *dvbdemux)
{
+ vfree(dvbdemux->cnt_storage);
vfree(dvbdemux->filter);
vfree(dvbdemux->feed);
}
diff --git a/drivers/media/dvb/dvb-core/dvb_demux.h b/drivers/media/dvb/dvb-core/dvb_demux.h
index 2c5f915329c..2fe05d03240 100644
--- a/drivers/media/dvb/dvb-core/dvb_demux.h
+++ b/drivers/media/dvb/dvb-core/dvb_demux.h
@@ -42,6 +42,8 @@
#define DVB_DEMUX_MASK_MAX 18
+#define MAX_PID 0x1fff
+
struct dvb_demux_filter {
struct dmx_section_filter filter;
u8 maskandmode[DMX_MAX_FILTER_SIZE];
@@ -127,6 +129,8 @@ struct dvb_demux {
struct mutex mutex;
spinlock_t lock;
+
+ uint8_t *cnt_storage; /* for TS continuity check */
};
int dvb_dmx_init(struct dvb_demux *dvbdemux);