dtv: implement ACCESS_GET_PRIVATE_ID_STATE control

modules/access/dtv/access.c

@@ -585,7 +585,14 @@ static int Control (access_t *access, int query, va_list args)
             break;
         }
 #endif
-        /*case ACCESS_GET_PRIVATE_ID_STATE: TODO? */
+        case ACCESS_GET_PRIVATE_ID_STATE:
+        {
+            unsigned pid = va_arg (args, int);
+            bool *on = va_arg (args, bool *);
+
+            *on = likely(pid <= 0x1FFF) ? dvb_get_pid_state(dev, pid) : false;
+            return VLC_SUCCESS;
+        }
 
         default:
             return VLC_EGENERIC;

modules/access/dtv/bdagraph.cpp

@@ -167,6 +167,11 @@ void dvb_remove_pid (dvb_device_t *, uint16_t)
 {
 }
 
+bool dvb_get_pid_state (const dvb_device_t *, uint16_t)
+{
+    return true;
+}
+
 unsigned dvb_enum_systems (dvb_device_t *d)
 {
     return d->module->EnumSystems( );

modules/access/dtv/dtv.h

@@ -50,6 +50,7 @@ ssize_t dvb_read (dvb_device_t *, void *, size_t);
 
 int dvb_add_pid (dvb_device_t *, uint16_t);
 void dvb_remove_pid (dvb_device_t *, uint16_t);
+bool dvb_get_pid_state (const dvb_device_t *, uint16_t);
 
 unsigned dvb_enum_systems (dvb_device_t *);
 float dvb_get_signal_strength (dvb_device_t *);

modules/access/dtv/linux.c

@@ -450,6 +450,18 @@ void dvb_remove_pid (dvb_device_t *d, uint16_t pid)
 #endif
 }
 
+bool dvb_get_pid_state (const dvb_device_t *d, uint16_t pid)
+{
+    if (d->budget)
+        return true;
+
+    for (size_t i = 0; i < MAX_PIDS; i++)
+        if (d->pids[i].pid == pid)
+            return true;
+
+    return false;
+}
+
 /** Finds a frontend of the correct type */
 static int dvb_open_frontend (dvb_device_t *d)
 {