decklink: Add read-only property to read the device serial number

https://bugzilla.gnome.org/show_bug.cgi?id=788510

sys/decklink/gstdecklink.cpp

@@ -1232,6 +1232,18 @@ init_devices (gpointer data)
     if (ret != S_OK) {
       GST_WARNING ("selected device does not have config interface: 0x%08lx",
           (unsigned long) ret);
+    } else {
+      char *serial_number;
+
+      ret =
+          devices[i].input.
+          config->GetString (bmdDeckLinkConfigDeviceInformationSerialNumber,
+          (COMSTR_T *) & serial_number);
+      CONVERT_COM_STRING (serial_number);
+      devices[i].output.hw_serial_number = g_strdup (serial_number);
+      devices[i].input.hw_serial_number = g_strdup (serial_number);
+      GST_DEBUG ("device %d has serial number %s", i, serial_number);
+      FREE_COM_STRING (serial_number);
     }
 
     ret = decklink->QueryInterface (IID_IDeckLinkAttributes,

sys/decklink/gstdecklink.h

@@ -209,6 +209,9 @@ struct _GstDecklinkOutput {
   IDeckLinkOutput *output;
   IDeckLinkAttributes *attributes;
   IDeckLinkKeyer *keyer;
+
+  gchar *hw_serial_number;
+
   GstClock *clock;
   GstClockTime clock_start_time, clock_last_time, clock_epoch;
   GstClockTimeDiff clock_offset;
@@ -238,6 +241,8 @@ struct _GstDecklinkInput {
   IDeckLinkConfiguration *config;
   IDeckLinkAttributes *attributes;
 
+  gchar *hw_serial_number;
+
   /* Everything below protected by mutex */
   GMutex lock;
 

sys/decklink/gstdecklinkaudiosink.cpp

@@ -487,6 +487,8 @@ gst_decklink_audio_sink_ringbuffer_open_device (GstAudioRingBuffer * rb)
     return FALSE;
   }
 
+  g_object_notify (G_OBJECT (self->sink), "hw-serial-number");
+
   gst_decklink_output_set_audio_clock (self->output,
       GST_AUDIO_BASE_SINK_CAST (self->sink)->provided_clock);
 
@@ -514,7 +516,8 @@ gst_decklink_audio_sink_ringbuffer_close_device (GstAudioRingBuffer * rb)
 enum
 {
   PROP_0,
-  PROP_DEVICE_NUMBER
+  PROP_DEVICE_NUMBER,
+  PROP_HW_SERIAL_NUMBER
 };
 
 static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
@@ -570,6 +573,11 @@ gst_decklink_audio_sink_class_init (GstDecklinkAudioSinkClass * klass)
           (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
               G_PARAM_CONSTRUCT)));
 
+  g_object_class_install_property (gobject_class, PROP_HW_SERIAL_NUMBER,
+      g_param_spec_string ("hw-serial-number", "Hardware serial number",
+          "The serial number (hardware ID) of the Decklink card",
+          NULL, (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
+
   gst_element_class_add_static_pad_template (element_class, &sink_template);
 
   gst_element_class_set_static_metadata (element_class, "Decklink Audio Sink",
@@ -619,6 +627,16 @@ gst_decklink_audio_sink_get_property (GObject * object, guint property_id,
     case PROP_DEVICE_NUMBER:
       g_value_set_int (value, self->device_number);
       break;
+    case PROP_HW_SERIAL_NUMBER:{
+      GstDecklinkAudioSinkRingBuffer *buf =
+          GST_DECKLINK_AUDIO_SINK_RING_BUFFER_CAST (GST_AUDIO_BASE_SINK_CAST
+          (self)->ringbuffer);
+      if (buf && buf->output)
+        g_value_set_string (value, buf->output->hw_serial_number);
+      else
+        g_value_set_string (value, NULL);
+      break;
+    }
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
       break;

sys/decklink/gstdecklinkaudiosrc.cpp

@@ -45,6 +45,7 @@ enum
   PROP_DISCONT_WAIT,
   PROP_BUFFER_SIZE,
   PROP_CHANNELS,
+  PROP_HW_SERIAL_NUMBER
 };
 
 static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("src",
@@ -184,6 +185,11 @@ gst_decklink_audio_src_class_init (GstDecklinkAudioSrcClass * klass)
           (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
               G_PARAM_CONSTRUCT)));
 
+  g_object_class_install_property (gobject_class, PROP_HW_SERIAL_NUMBER,
+      g_param_spec_string ("hw-serial-number", "Hardware serial number",
+          "The serial number (hardware ID) of the Decklink card",
+          NULL, (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
+
   gst_element_class_add_static_pad_template (element_class, &sink_template);
 
   gst_element_class_set_static_metadata (element_class, "Decklink Audio Source",
@@ -271,6 +277,12 @@ gst_decklink_audio_src_get_property (GObject * object, guint property_id,
     case PROP_CHANNELS:
       g_value_set_enum (value, self->channels);
       break;
+    case PROP_HW_SERIAL_NUMBER:
+      if (self->input)
+        g_value_set_string (value, self->input->hw_serial_number);
+      else
+        g_value_set_string (value, NULL);
+      break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
       break;
@@ -792,6 +804,8 @@ gst_decklink_audio_src_open (GstDecklinkAudioSrc * self)
     return FALSE;
   }
 
+  g_object_notify (G_OBJECT (self), "hw-serial-number");
+
   g_mutex_lock (&self->input->lock);
   if (self->channels > 0) {
     self->channels_found = self->channels;

sys/decklink/gstdecklinkvideosink.cpp

@@ -122,7 +122,8 @@ enum
   PROP_VIDEO_FORMAT,
   PROP_TIMECODE_FORMAT,
   PROP_KEYER_MODE,
-  PROP_KEYER_LEVEL
+  PROP_KEYER_LEVEL,
+  PROP_HW_SERIAL_NUMBER
 };
 
 static void gst_decklink_video_sink_set_property (GObject * object,
@@ -243,6 +244,11 @@ gst_decklink_video_sink_class_init (GstDecklinkVideoSinkClass * klass)
           (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
               G_PARAM_CONSTRUCT)));
 
+  g_object_class_install_property (gobject_class, PROP_HW_SERIAL_NUMBER,
+      g_param_spec_string ("hw-serial-number", "Hardware serial number",
+          "The serial number (hardware ID) of the Decklink card",
+          NULL, (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
+
   templ_caps = gst_decklink_mode_get_template_caps (FALSE);
   templ_caps = gst_caps_make_writable (templ_caps);
   /* For output we support any framerate and only really care about timestamps */
@@ -346,6 +352,12 @@ gst_decklink_video_sink_get_property (GObject * object, guint property_id,
     case PROP_KEYER_LEVEL:
       g_value_set_int (value, self->keyer_level);
       break;
+    case PROP_HW_SERIAL_NUMBER:
+      if (self->output)
+        g_value_set_string (value, self->output->hw_serial_number);
+      else
+        g_value_set_string (value, NULL);
+      break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
       break;
@@ -762,6 +774,8 @@ gst_decklink_video_sink_open (GstBaseSink * bsink)
     return FALSE;
   }
 
+  g_object_notify (G_OBJECT (self), "hw-serial-number");
+
   mode = gst_decklink_get_mode (self->mode);
   g_assert (mode != NULL);
 

sys/decklink/gstdecklinkvideosrc.cpp

@@ -48,7 +48,8 @@ enum
   PROP_OUTPUT_STREAM_TIME,
   PROP_SKIP_FIRST_TIME,
   PROP_DROP_NO_SIGNAL_FRAMES,
-  PROP_SIGNAL
+  PROP_SIGNAL,
+  PROP_HW_SERIAL_NUMBER
 };
 
 typedef struct
@@ -211,6 +212,11 @@ gst_decklink_video_src_class_init (GstDecklinkVideoSrcClass * klass)
           "True if there is a valid input signal available",
           FALSE, (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
 
+  g_object_class_install_property (gobject_class, PROP_HW_SERIAL_NUMBER,
+      g_param_spec_string ("hw-serial-number", "Hardware serial number",
+          "The serial number (hardware ID) of the Decklink card",
+          NULL, (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
+
   templ_caps = gst_decklink_mode_get_template_caps (TRUE);
   gst_element_class_add_pad_template (element_class,
       gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS, templ_caps));
@@ -359,6 +365,12 @@ gst_decklink_video_src_get_property (GObject * object, guint property_id,
     case PROP_SIGNAL:
       g_value_set_boolean (value, !self->no_signal);
       break;
+    case PROP_HW_SERIAL_NUMBER:
+      if (self->input)
+        g_value_set_string (value, self->input->hw_serial_number);
+      else
+        g_value_set_string (value, NULL);
+      break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
       break;
@@ -970,6 +982,8 @@ gst_decklink_video_src_open (GstDecklinkVideoSrc * self)
     return FALSE;
   }
 
+  g_object_notify (G_OBJECT (self), "hw-serial-number");
+
   mode = gst_decklink_get_mode (self->mode);
   g_assert (mode != NULL);
   g_mutex_lock (&self->input->lock);