Differenze tra le versioni di "Riproduzione dell'audio di radio WEB con le funzioni esterne del API di GStreamer"
Da Gambas-it.org - Wikipedia.
| Riga 2: | Riga 2: | ||
| − | + | ===Uso del plug-in ''playbin''=== | |
Private Const GST_STATE_NULL As Integer = 1 | Private Const GST_STATE_NULL As Integer = 1 | ||
Private Const GST_STATE_PLAYING As Integer = 4 | Private Const GST_STATE_PLAYING As Integer = 4 | ||
| Riga 10: | Riga 10: | ||
Library "libgstreamer-1.0" | Library "libgstreamer-1.0" | ||
| − | <FONT color=gray>' ''gst_init (&argc, &argv)''</font> | + | <FONT color=gray>' ''gst_init (&argc, &argv)'' |
| + | ' ''Initializes the GStreamer library, setting up internal path lists, registering built-in elements, and loading standard plugins.''</font> | ||
Private Extern gst_init(argc As Integer, argv As Pointer) | Private Extern gst_init(argc As Integer, argv As Pointer) | ||
| − | <FONT color=gray>' ''GstElement * gst_element_factory_make(const gchar *factoryname, Const gchar * name)''</font> | + | <FONT color=gray>' ''GstElement * gst_element_factory_make(const gchar *factoryname, Const gchar * name)'' |
| + | ' ''Create a new element of the type defined by the given element factory.''</font> | ||
Private Extern gst_element_factory_make(factoryname As String, name As String) As Pointer | Private Extern gst_element_factory_make(factoryname As String, name As String) As Pointer | ||
| − | <FONT color=gray>' ''void g_object_set(gpointer object, const gchar *first_property_name, ...)''</font> | + | <FONT color=gray>' ''void g_object_set(gpointer object, const gchar *first_property_name, ...)'' |
| + | ' ''Sets properties on an object.''</font> | ||
Private Extern g_object_set(gobject As Pointer, key As String, value As String, nl As String) | Private Extern g_object_set(gobject As Pointer, key As String, value As String, nl As String) | ||
| − | <FONT color=gray>' ''GstStateChangeReturn gst_element_set_state(GstElement *element, GstState state)''</font> | + | <FONT color=gray>' ''GstStateChangeReturn gst_element_set_state(GstElement *element, GstState state)'' |
| + | ' ''Sets the state of the element.''</font> | ||
Private Extern gst_element_set_state(gstobject As Pointer, state As Integer) As Integer | Private Extern gst_element_set_state(gstobject As Pointer, state As Integer) As Integer | ||
| − | <FONT color=gray>' ''void gst_object_unref(gpointer object)''</font> | + | <FONT color=gray>' ''void gst_object_unref(gpointer object)'' |
| + | ' ''Decrements the reference count on object .''</font> | ||
Private Extern gst_object_unref(gobject As Pointer) | Private Extern gst_object_unref(gobject As Pointer) | ||
Versione delle 16:20, 16 feb 2017
Le stazioni radio via WEB possono essere ascoltate utilizzando le risorse del API di GStreamer.
Uso del plug-in playbin
Private Const GST_STATE_NULL As Integer = 1
Private Const GST_STATE_PLAYING As Integer = 4
Private play As Pointer
Library "libgstreamer-1.0"
' gst_init (&argc, &argv)
' Initializes the GStreamer library, setting up internal path lists, registering built-in elements, and loading standard plugins.
Private Extern gst_init(argc As Integer, argv As Pointer)
' GstElement * gst_element_factory_make(const gchar *factoryname, Const gchar * name)
' Create a new element of the type defined by the given element factory.
Private Extern gst_element_factory_make(factoryname As String, name As String) As Pointer
' void g_object_set(gpointer object, const gchar *first_property_name, ...)
' Sets properties on an object.
Private Extern g_object_set(gobject As Pointer, key As String, value As String, nl As String)
' GstStateChangeReturn gst_element_set_state(GstElement *element, GstState state)
' Sets the state of the element.
Private Extern gst_element_set_state(gstobject As Pointer, state As Integer) As Integer
' void gst_object_unref(gpointer object)
' Decrements the reference count on object .
Private Extern gst_object_unref(gobject As Pointer)
Public Sub Form_Open()
Dim retI As Integer
gst_init(0, 0)
play = gst_element_factory_make("playbin", "play")
' Nel terzo argomento della seguente funzione va inserito
' l'indirizzo web del flusso di dati audio in tempo reale:
g_object_set(play, "uri", "http://indirizzo/web/del/flusso/dati/della/radio4-web", Null)
' Avviamo la riproduzione audio della radio-web:
retI = gst_element_set_state(play, GST_STATE_PLAYING)
Print "Stato di cambiamento = "; retI
End
Public Sub Button1_Click()
Dim retI As Integer
' Arrestiamo la riproduzione audio:
retI = gst_element_set_state(play, GST_STATE_NULL)
Print "Stato di cambiamento = "; retI
gst_object_unref(play)
End
