Differenze tra le versioni di "Registrare in un file audio una fonte sonora esterna usando una linea di pipeline con la funzione 'gst parse launch()'"

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(Creata pagina con "La funzione esterna "gst_parse_launch()" della libreria ''GStreamer'' consente di costruire e gestire in modo semplice una pipeline ''GStreamer''. La riga della pipeline gesti...")
 
Riga 5: Riga 5:
 
Sarà necessario avere installata nel sistema e richiamare nell'applicazione Gambas la libreria condivisa: "''libgstreamer-1.0'' ".
 
Sarà necessario avere installata nel sistema e richiamare nell'applicazione Gambas la libreria condivisa: "''libgstreamer-1.0'' ".
  
−
=Registrare in un file OGG una fonte audio esterna=
+
=Registrare una fonte audio esterna in un file audio di formato WAV=
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Private audio As Pointer
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Private bo As Boolean
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 +
 +
Library "libgstreamer-1.0"
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 +
Private Enum GST_STATE_VOID_PENDING = 0, GST_STATE_NULL, GST_STATE_READY, GST_STATE_PAUSED, GST_STATE_PLAYING
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Private Const GST_FORMAT_TIME As Integer = 3
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<FONT Color=gray>' ''gst_init (int *argc, char **argv[])''
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' ''Initializes the GStreamer library, setting up internal path lists, registering built-in elements, and loading standard plugins.''</font>
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Private Extern gst_init(argc As Pointer, argv As Pointer)
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<FONT Color=gray>' ''GstElement * gst_parse_launch (const gchar *pipeline_description, GError **error)''
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' ''Create a new pipeline based on command line syntax.''</font>
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Private Extern gst_parse_launch(description As String, GError As Pointer) As Pointer
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<FONT Color=gray>' ''GstStateChangeReturn gst_element_set_state(GstElement *element, GstState state)''
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' ''Sets the state of the element.''</font>
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Private Extern gst_element_set_state(gstelement As Pointer, state As Integer) As Integer
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<FONT Color=gray>' ''gboolean gst_element_query_position (GstElement *element, GstFormat format, gint64 *cur)''
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' ''Queries an element for the stream position in nanoseconds.''</font>
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Private Extern gst_element_query_position(gstelement As Pointer, gstformat As Pointer, cur As Pointer) As Boolean
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<FONT Color=gray>' ''void gst_object_unref(gpointer object)''
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' ''Decrements the reference count on object.''</font>
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Private Extern gst_object_unref(gobject As Pointer)
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Public Sub Main()
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  Dim tempus As Long
 +
     
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  gst_init(0, 0)
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<FONT Color=gray>' ''Salviamo, quanto registrato, in un file WAV 44100 hertz, 16-bit, 2 canali:''</font>
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  audio = gst_parse_launch("alsasrc ! audio/x-raw,rate=<FONT Color=#B22222>44100</font>,depth=<FONT Color=#B22222>16</font>,channels=<FONT Color=#B22222>2</font>,width=16,signed=true ! volume volume=2.0 ! wavenc ! filesink location=<FONT Color=darkgreen>''/percorso/del/file.wav''</font>", 0)
 +
       
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<FONT Color=gray>' ''Avviamo la registrazione audio:''</font>
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  gst_element_set_state(audio, GST_STATE_PLAYING)
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 +
  While Not bo
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    gst_element_query_position(audio, GST_FORMAT_TIME, VarPtr(tempus))
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    Write "\rTempo trascorso: " & Write "\rTempo trascorso: " & Str(Time(0, 0, 0, tempus / 1000000))
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    Flush
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    Wait 0.1
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  Wend
 +
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<FONT Color=gray>' ''Arresta la registrazione del file MP3:''</font>
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  gst_element_set_state(audio, GST_STATE_NULL)
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  gst_object_unref(audio)
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  Print "\nRegistrazione terminata."
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  Quit
 +
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End
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 +
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Public Sub Application_Read()
 +
 +
  bo = True
 +
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End
 +
 
 +
=Registrare una fonte audio esterna in un file audio di formato MP3=
 +
Mostriamo un esempio pratico per registrare in MP3 una fonte sonora esterna:
 +
Private audio As Pointer
 +
Private bo As Boolean
 +
 +
 +
Library "libgstreamer-1.0"
 +
 +
Private Enum GST_STATE_VOID_PENDING = 0, GST_STATE_NULL, GST_STATE_READY, GST_STATE_PAUSED, GST_STATE_PLAYING
 +
Private Const GST_FORMAT_TIME As Integer = 3
 +
 +
<FONT Color=gray>' ''gst_init (int *argc, char **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 Pointer, argv As Pointer)
 +
 +
<FONT Color=gray>' ''GstElement * gst_parse_launch (const gchar *pipeline_description, GError **error)''
 +
' ''Create a new pipeline based on command line syntax.''</font>
 +
Private Extern gst_parse_launch(description As String, GError As Pointer) As Pointer
 +
 +
<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(gstelement As Pointer, state As Integer) As Integer
 +
 
 +
<FONT Color=gray>' ''gboolean gst_element_query_position (GstElement *element, GstFormat format, gint64 *cur)''
 +
' ''Queries an element for the stream position in nanoseconds.''</font>
 +
Private Extern gst_element_query_position(gstelement As Pointer, gstformat As Pointer, cur As Pointer) As Boolean
 +
 +
<FONT Color=gray>' ''void gst_object_unref(gpointer object)''
 +
' ''Decrements the reference count on object.''</font>
 +
Private Extern gst_object_unref(gobject As Pointer)
 +
 +
 +
Public Sub Main()
 +
 
 +
  Dim tempus As Long
 +
     
 +
  gst_init(0, 0)
 +
 
 +
<FONT Color=gray>' ''Questa pipeline consente di registrare in un file audio MP3:''</font>
 +
  audio = gst_parse_launch("alsasrc ! audioconvert ! lamemp3enc ! filesink location=<FONT Color=darkgreen>''/percorso/del/file.mp3''</font>", 0)
 +
       
 +
<FONT Color=gray>' ''Avviamo la registrazione audio:''</font>
 +
  gst_element_set_state(audio, GST_STATE_PLAYING)
 +
 
 +
  While Not bo
 +
    gst_element_query_position(audio, GST_FORMAT_TIME, VarPtr(tempus))
 +
    Write "\rTempo trascorso: " & Write "\rTempo trascorso: " & Str(Time(0, 0, 0, tempus / 1000000))
 +
    Flush
 +
    Wait 0.1
 +
  Wend
 +
 +
<FONT Color=gray>' ''Arresta la registrazione del file MP3:''</font>
 +
  gst_element_set_state(audio, GST_STATE_NULL)
 +
  gst_object_unref(audio)
 +
  Print "\nRegistrazione terminata."
 +
  Quit
 +
 +
End
 +
 +
 +
Public Sub Application_Read()
 +
 +
  bo = True
 +
 +
End
 +
 
 +
=Registrare una fonte audio esterna in un file audio di formato OGG=
 
Mostriamo un esempio pratico per registrare in OGG una fonte sonora esterna:
 
Mostriamo un esempio pratico per registrare in OGG una fonte sonora esterna:
 
  Private audio As Pointer
 
  Private audio As Pointer

Versione delle 16:43, 11 gen 2024

La funzione esterna "gst_parse_launch()" della libreria GStreamer consente di costruire e gestire in modo semplice una pipeline GStreamer. La riga della pipeline gestita dalla funzione esterna "gst_parse_launch()" è un insieme di elementi separati da punti esclamativi (!). Le proprietà possono essere aggiunte agli elementi, sotto forma di: proprietà = valore.

Mediante tale funzione esterna ed un'apposita pipeline di elementi GStreamer è possibile registrare una fonte audio esterna e salvare, quanto registrato, in un file audio.

Sarà necessario avere installata nel sistema e richiamare nell'applicazione Gambas la libreria condivisa: "libgstreamer-1.0 ".

Registrare una fonte audio esterna in un file audio di formato WAV

Private audio As Pointer
Private bo As Boolean


Library "libgstreamer-1.0"

Private Enum GST_STATE_VOID_PENDING = 0, GST_STATE_NULL, GST_STATE_READY, GST_STATE_PAUSED, GST_STATE_PLAYING
Private Const GST_FORMAT_TIME As Integer = 3

' gst_init (int *argc, char **argv[])
' Initializes the GStreamer library, setting up internal path lists, registering built-in elements, and loading standard plugins.
Private Extern gst_init(argc As Pointer, argv As Pointer)

' GstElement * gst_parse_launch (const gchar *pipeline_description, GError **error)
' Create a new pipeline based on command line syntax.
Private Extern gst_parse_launch(description As String, GError As Pointer) As Pointer

' GstStateChangeReturn gst_element_set_state(GstElement *element, GstState state)
' Sets the state of the element.
Private Extern gst_element_set_state(gstelement As Pointer, state As Integer) As Integer
 
' gboolean gst_element_query_position (GstElement *element, GstFormat format, gint64 *cur)
' Queries an element for the stream position in nanoseconds.
Private Extern gst_element_query_position(gstelement As Pointer, gstformat As Pointer, cur As Pointer) As Boolean

' void gst_object_unref(gpointer object)
' Decrements the reference count on object.
Private Extern gst_object_unref(gobject As Pointer)


Public Sub Main()
 
 Dim tempus As Long
     
 gst_init(0, 0)
  
' Salviamo, quanto registrato, in un file WAV 44100 hertz, 16-bit, 2 canali:
 audio = gst_parse_launch("alsasrc ! audio/x-raw,rate=44100,depth=16,channels=2,width=16,signed=true ! volume volume=2.0 ! wavenc ! filesink location=/percorso/del/file.wav", 0)
       
' Avviamo la registrazione audio:
 gst_element_set_state(audio, GST_STATE_PLAYING)
  
 While Not bo
   gst_element_query_position(audio, GST_FORMAT_TIME, VarPtr(tempus))
   Write "\rTempo trascorso: " & Write "\rTempo trascorso: " & Str(Time(0, 0, 0, tempus / 1000000))
   Flush
   Wait 0.1
 Wend

' Arresta la registrazione del file MP3:
 gst_element_set_state(audio, GST_STATE_NULL)
 gst_object_unref(audio)
 Print "\nRegistrazione terminata."
 Quit

End


Public Sub Application_Read()

 bo = True

End

Registrare una fonte audio esterna in un file audio di formato MP3

Mostriamo un esempio pratico per registrare in MP3 una fonte sonora esterna: 

Private audio As Pointer
Private bo As Boolean


Library "libgstreamer-1.0"

Private Enum GST_STATE_VOID_PENDING = 0, GST_STATE_NULL, GST_STATE_READY, GST_STATE_PAUSED, GST_STATE_PLAYING
Private Const GST_FORMAT_TIME As Integer = 3

' gst_init (int *argc, char **argv[])
' Initializes the GStreamer library, setting up internal path lists, registering built-in elements, and loading standard plugins.
Private Extern gst_init(argc As Pointer, argv As Pointer)

' GstElement * gst_parse_launch (const gchar *pipeline_description, GError **error)
' Create a new pipeline based on command line syntax.
Private Extern gst_parse_launch(description As String, GError As Pointer) As Pointer

' GstStateChangeReturn gst_element_set_state(GstElement *element, GstState state)
' Sets the state of the element.
Private Extern gst_element_set_state(gstelement As Pointer, state As Integer) As Integer
 
' gboolean gst_element_query_position (GstElement *element, GstFormat format, gint64 *cur)
' Queries an element for the stream position in nanoseconds.
Private Extern gst_element_query_position(gstelement As Pointer, gstformat As Pointer, cur As Pointer) As Boolean

' void gst_object_unref(gpointer object)
' Decrements the reference count on object.
Private Extern gst_object_unref(gobject As Pointer)


Public Sub Main()
 
 Dim tempus As Long
     
 gst_init(0, 0)
  
' Questa pipeline consente di registrare in un file audio MP3:
 audio = gst_parse_launch("alsasrc ! audioconvert ! lamemp3enc ! filesink location=/percorso/del/file.mp3", 0)
       
' Avviamo la registrazione audio:
 gst_element_set_state(audio, GST_STATE_PLAYING)
  
 While Not bo
   gst_element_query_position(audio, GST_FORMAT_TIME, VarPtr(tempus))
   Write "\rTempo trascorso: " & Write "\rTempo trascorso: " & Str(Time(0, 0, 0, tempus / 1000000))
   Flush
   Wait 0.1
 Wend

' Arresta la registrazione del file MP3:
 gst_element_set_state(audio, GST_STATE_NULL)
 gst_object_unref(audio)
 Print "\nRegistrazione terminata."
 Quit

End


Public Sub Application_Read()

 bo = True

End

Registrare una fonte audio esterna in un file audio di formato OGG

Mostriamo un esempio pratico per registrare in OGG una fonte sonora esterna: 

Private audio As Pointer
Private bo As Boolean


Library "libgstreamer-1.0"

Private Enum GST_STATE_VOID_PENDING = 0, GST_STATE_NULL, GST_STATE_READY, GST_STATE_PAUSED, GST_STATE_PLAYING
Private Const GST_FORMAT_TIME As Integer = 3

' gst_init (int *argc, char **argv[])
' Initializes the GStreamer library, setting up internal path lists, registering built-in elements, and loading standard plugins.
Private Extern gst_init(argc As Pointer, argv As Pointer)

' GstElement * gst_parse_launch (const gchar *pipeline_description, GError **error)
' Create a new pipeline based on command line syntax.
Private Extern gst_parse_launch(description As String, GError As Pointer) As Pointer

' GstStateChangeReturn gst_element_set_state(GstElement *element, GstState state)
' Sets the state of the element.
Private Extern gst_element_set_state(gstelement As Pointer, state As Integer) As Integer
 
' gboolean gst_element_query_position (GstElement *element, GstFormat format, gint64 *cur)
' Queries an element for the stream position in nanoseconds.
Private Extern gst_element_query_position(gstelement As Pointer, gstformat As Pointer, cur As Pointer) As Boolean

' void gst_object_unref(gpointer object)
' Decrements the reference count on object.
Private Extern gst_object_unref(gobject As Pointer)


Public Sub Main()
 
 Dim tempus As Long
     
 gst_init(0, 0)
  
' Questa pipeline consente di registrare in un file audio OGG:
 audio = gst_parse_launch("alsasrc ! audioconvert ! vorbisenc ! oggmux ! filesink location=/percorso/del/file.ogg", 0)
       
' Avviamo la registrazione audio:
 gst_element_set_state(audio, GST_STATE_PLAYING)
  
 While Not bo
   gst_element_query_position(audio, GST_FORMAT_TIME, VarPtr(tempus))
   Write "\rTempo trascorso: " & Write "\rTempo trascorso: " & Str(Time(0, 0, 0, tempus / 1000000))
   Flush
   Wait 0.1
 Wend

' Arresta la registrazione del file OGG:
  gst_element_set_state(audio, GST_STATE_NULL)
  gst_object_unref(audio)
  Print "\nRegistrazione terminata."
  Quit

End


Public Sub Application_Read()

 bo = True

End
Estratto da "https://www.gambas-it.org/wiki/index.php?title=Registrare_in_un_file_audio_una_fonte_sonora_esterna_usando_una_linea_di_pipeline_con_la_funzione_%27gst_parse_launch()%27&oldid=36109"