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()'"
Da Gambas-it.org - Wikipedia.
| Riga 6: | Riga 6: | ||
=Registrare una fonte audio esterna in un file audio di formato WAV= | =Registrare una fonte audio esterna in un file audio di formato WAV= | ||
| + | Mostriamo un esempio pratico per registrare in WAV una fonte sonora esterna: | ||
Private audio As Pointer | Private audio As Pointer | ||
Private bo As Boolean | Private bo As Boolean | ||
| Riga 55: | Riga 56: | ||
Wend | Wend | ||
| − | <FONT Color=gray>' ''Arresta la registrazione del file | + | <FONT Color=gray>' ''Arresta la registrazione del file WAV:''</font> |
gst_element_set_state(audio, GST_STATE_NULL) | gst_element_set_state(audio, GST_STATE_NULL) | ||
gst_object_unref(audio) | gst_object_unref(audio) | ||
| Riga 188: | Riga 189: | ||
<FONT Color=gray>' ''Arresta la registrazione del file OGG:''</font> | <FONT Color=gray>' ''Arresta la registrazione del file OGG:''</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 AAC= | ||
| + | Mostriamo un esempio pratico per registrare in AAC 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 AAC:''</font> | ||
| + | audio = gst_parse_launch("alsasrc ! audioconvert ! faac ! audio/mpeg,stream-format=adts,channels=2,rate=44100 ! filesink location=<FONT Color=darkgreen>''/percorso/del/file.aac''</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 AAC:''</font> | ||
gst_element_set_state(audio, GST_STATE_NULL) | gst_element_set_state(audio, GST_STATE_NULL) | ||
gst_object_unref(audio) | gst_object_unref(audio) | ||
Versione delle 16:50, 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 ".
Indice
Registrare una fonte audio esterna in un file audio di formato WAV
Mostriamo un esempio pratico per registrare in WAV 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)
' 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 WAV:
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
Registrare una fonte audio esterna in un file audio di formato AAC
Mostriamo un esempio pratico per registrare in AAC 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 AAC:
audio = gst_parse_launch("alsasrc ! audioconvert ! faac ! audio/mpeg,stream-format=adts,channels=2,rate=44100 ! filesink location=/percorso/del/file.aac", 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 AAC:
gst_element_set_state(audio, GST_STATE_NULL)
gst_object_unref(audio)
Print "\nRegistrazione terminata."
Quit
End
Public Sub Application_Read()
bo = True
End
