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dvbsrc: improve delivery system autodetection

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This commit is contained in:
Reynaldo H. Verdejo Pinochet 2016-05-12 16:43:09 -07:00
parent 793c1a2423
commit 15e21fee71
1 changed files with 37 additions and 16 deletions
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53
sys/dvb/gstdvbsrc.c
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@ -2339,26 +2339,47 @@ fail:
static void
gst_dvbsrc_guess_delsys (GstDvbSrc * object)
{
GList *delsys;
GList *valid, *candidate;
guint alternatives;
/* If adapter only supports one delivery system, there's no real choice */
if (g_list_length (object->supported_delsys) == 1)
goto go_with_default;
/* Add delivery system specific rules here */
/* DVB-T/T2 on QAM_256 channel? has to be DVB-T2 */
if (object->modulation == QAM_256 &&
g_list_find (object->supported_delsys, GINT_TO_POINTER (SYS_DVBT2))) {
object->delsys = SYS_DVBT2;
if (g_list_length (object->supported_delsys) == 1) {
object->delsys = GPOINTER_TO_INT (object->supported_delsys->data);
GST_DEBUG_OBJECT (object, "Adapter supports a single delsys: '%u'",
object->delsys);
goto autoselection_done;
}
/* No rule provided a match so we default to the last device-reported
* supported delivery system */
go_with_default:
delsys = g_list_last (object->supported_delsys);
object->delsys = GPOINTER_TO_INT (delsys->data);
/* Automatic delivery system selection based on known-correct
* parameter combinations */
valid = g_list_copy (object->supported_delsys);
candidate = valid;
while (candidate) {
GList *next = candidate->next;
if (!gst_dvbsrc_is_valid_modulation (GPOINTER_TO_INT (candidate->data),
object->modulation)) {
valid = g_list_delete_link (valid, candidate);
}
candidate = next;
}
alternatives = g_list_length (valid);
if (!alternatives) {
GST_WARNING_OBJECT (object, "Delivery system autodetection provided no "
"valid alternative");
candidate = g_list_last (object->supported_delsys);
} else {
if (alternatives > 1) {
GST_WARNING_OBJECT (object, "Delivery system autodetection provided more "
"than one valid alternative");
}
candidate = g_list_last (valid);
}
object->delsys = GPOINTER_TO_INT (candidate->data);
g_list_free (valid);
autoselection_done:
GST_INFO_OBJECT (object, "Automatically selecting delivery system '%u'",