Differenze tra le versioni di "Registrare e salvare in un file video un flusso di dati da una IPTV con le funzioni esterne del API di VLC"
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Riga 2: | Riga 2: | ||
Sarà necessario avere installata nel sistema e richiamare nell'applicazione Gambas la libreria condivisa: "''libvlc.so.5.6.1'' ". | Sarà necessario avere installata nel sistema e richiamare nell'applicazione Gambas la libreria condivisa: "''libvlc.so.5.6.1'' ". | ||
+ | |||
+ | Mostriamo di seguito un semplice esempio in ambiente grafico: | ||
+ | Private bo As Boolean | ||
+ | |||
+ | |||
+ | Library "libvlc:5.6.1" | ||
+ | |||
+ | ' libvlc_instance_t * libvlc_new (int argc, const char *const *argv) | ||
+ | ' Create And initialize a libvlc instance. | ||
+ | Private Extern libvlc_new(argc As Integer, argv As String[]) As Pointer | ||
+ | |||
+ | ' libvlc_media_t *libvlc_media_new_location (libvlc_instance_t *p_instance, const char * psz_mrl) | ||
+ | ' Create a media with a certain given media resource location, for instance a valid URL. | ||
+ | Private Extern libvlc_media_new_location(p_instance As Pointer, path As String) As Pointer | ||
+ | |||
+ | ' void libvlc_media_add_option (libvlc_media_t *p_md, const char *psz_options) | ||
+ | ' Add an option to the media. | ||
+ | Private Extern libvlc_media_add_option(p_mi As Pointer, psz_options As String) | ||
+ | |||
+ | ' libvlc_media_player_t * libvlc_media_player_new (libvlc_instance_t *p_libvlc_instance) | ||
+ | ' Create an empty Media Player object. | ||
+ | Private Extern libvlc_media_player_new(p_libvlc_instance As Pointer) As Pointer | ||
+ | |||
+ | ' void libvlc_media_player_set_media (libvlc_media_player_t *p_mi, libvlc_media_t *p_md) | ||
+ | ' Set the media that will be used by the media_player. | ||
+ | Private Extern libvlc_media_player_set_media(p_md As Pointer, mp As Pointer) | ||
+ | |||
+ | ' int libvlc_media_player_play (libvlc_media_player_t * p_mi) | ||
+ | ' Play the video file. | ||
+ | Private Extern libvlc_media_player_play(p_mi As Pointer) As Integer | ||
+ | |||
+ | ' libvlc_time_t libvlc_media_player_get_time (libvlc_media_player_t * p_mi) | ||
+ | ' Get the current movie time (in ms). | ||
+ | Private Extern libvlc_media_player_get_time(p_mi As Pointer) As Integer | ||
+ | |||
+ | ' void libvlc_media_player_release (libvlc_media_player_t * p_mi) | ||
+ | ' Release a media_player after use Decrement the reference count of a media player object. | ||
+ | Private Extern libvlc_media_player_release(p_mi As Pointer) | ||
+ | |||
+ | ' void libvlc_media_release (libvlc_media_t *p_md) | ||
+ | ' Decrement the reference count of a media descriptor object. | ||
+ | Private Extern libvlc_media_release(p_md As Pointer) | ||
+ | |||
+ | ' libvlc_release (libvlc_instance_t * p_instance) | ||
+ | ' Decrement the reference count of a libvlc instance, and destroy it if it reaches zero. | ||
+ | Private Extern libvlc_release(p_instance As Pointer) | ||
+ | |||
+ | |||
+ | Public Sub ToggleButton1_Click() | ||
+ | |||
+ | Dim inst, mp, m As Pointer | ||
+ | |||
+ | If ToggleButton1.Value Then | ||
+ | ' Inizializza e imposta le opzioni relative al video: | ||
+ | ' ["vcodec=mp4v,fps=30,vb=512"] | ||
+ | ' ["vcodec=flv,fps=30,vb=512"] | ||
+ | inst = libvlc_new(1, ["vcodec=h264,fps=30,vb=512"]) | ||
+ | If inst == 0 Then Error.Raise("Impossibile inizializzare la libreria VLC !") | ||
+ | |||
+ | ' Crea il media player: | ||
+ | mp = libvlc_media_player_new(inst) | ||
+ | If mp == 0 Then Error.Raise("Impossibile creare il media player !") | ||
+ | |||
+ | ' Crea un nuovo oggetto multimedia. | ||
+ | ' Nel secondo argomento della funzione va specificato il percorso del file-device video: | ||
+ | m = libvlc_media_new_location(inst, "http://wzstreaming.rai.it/TVlive/liveStream/playlist.m3u8") | ||
+ | If m == 0 Then Error.Raise("Impossibile creare un oggetto multimediale !") | ||
+ | |||
+ | |||
+ | ' Viene aggiunta l'opzione per la registrazione dell'audio mediante il sistema ALSA: | ||
+ | libvlc_media_add_option(m, ":sout=#transcode{acodec=mp3,ab=192,channels=2,samplerate=44100,deinterlace} :duplicate{dst=display,dst=std{access=file,mux=avi,dst=/tmp/zzz.avi}}") | ||
+ | |||
+ | ' ":sout=#transcode{acodec=mp3,ab=192,channels=2,samplerate=44100,deinterlace} :duplicate{dst=display,dst=std{access=file,mux=flv,dst=/tmp/zzz.flv}}") | ||
+ | ' ":sout=#transcode{acodec=mp3,ab=192,channels=2,samplerate=44100,deinterlace} :duplicate{dst=display,dst=std{access=file,mux=mp4,dst=/tmp/zzz.mp4}}") | ||
+ | |||
+ | libvlc_media_player_set_media(mp, m) | ||
+ | |||
+ | ' Avvia la cattura del video-audio da parte del media player: | ||
+ | libvlc_media_player_play(mp) | ||
+ | |||
+ | While bo = False | ||
+ | Me.Title = Str(Time(0, 0, 0, libvlc_media_player_get_time(mp))) | ||
+ | ' Il Wait consente di agire su altri oggetti posti sul Form: | ||
+ | Wait 0.01 | ||
+ | Wend | ||
+ | |||
+ | ' Chiude la libreria VLC ed il programma: | ||
+ | libvlc_media_player_release(mp) | ||
+ | libvlc_media_release(m) | ||
+ | libvlc_release(inst) | ||
+ | Me.Close | ||
+ | Else | ||
+ | ' Causa l'arresto della registrazione, la chiusura della libreria VLC e del programma: | ||
+ | bo = True | ||
+ | Endif | ||
+ | |||
+ | End |
Versione delle 11:53, 21 ago 2024
E' possibile rgistrare e salvare in un file video un flusso di dati da una IPTV (web-TV) con le funzioni esterne del API di VLC.
Sarà necessario avere installata nel sistema e richiamare nell'applicazione Gambas la libreria condivisa: "libvlc.so.5.6.1 ".
Mostriamo di seguito un semplice esempio in ambiente grafico:
Private bo As Boolean
Library "libvlc:5.6.1"
' libvlc_instance_t * libvlc_new (int argc, const char *const *argv) ' Create And initialize a libvlc instance. Private Extern libvlc_new(argc As Integer, argv As String[]) As Pointer
' libvlc_media_t *libvlc_media_new_location (libvlc_instance_t *p_instance, const char * psz_mrl) ' Create a media with a certain given media resource location, for instance a valid URL. Private Extern libvlc_media_new_location(p_instance As Pointer, path As String) As Pointer
' void libvlc_media_add_option (libvlc_media_t *p_md, const char *psz_options) ' Add an option to the media. Private Extern libvlc_media_add_option(p_mi As Pointer, psz_options As String)
' libvlc_media_player_t * libvlc_media_player_new (libvlc_instance_t *p_libvlc_instance) ' Create an empty Media Player object. Private Extern libvlc_media_player_new(p_libvlc_instance As Pointer) As Pointer
' void libvlc_media_player_set_media (libvlc_media_player_t *p_mi, libvlc_media_t *p_md) ' Set the media that will be used by the media_player. Private Extern libvlc_media_player_set_media(p_md As Pointer, mp As Pointer)
' int libvlc_media_player_play (libvlc_media_player_t * p_mi) ' Play the video file. Private Extern libvlc_media_player_play(p_mi As Pointer) As Integer
' libvlc_time_t libvlc_media_player_get_time (libvlc_media_player_t * p_mi) ' Get the current movie time (in ms). Private Extern libvlc_media_player_get_time(p_mi As Pointer) As Integer
' void libvlc_media_player_release (libvlc_media_player_t * p_mi) ' Release a media_player after use Decrement the reference count of a media player object. Private Extern libvlc_media_player_release(p_mi As Pointer)
' void libvlc_media_release (libvlc_media_t *p_md) ' Decrement the reference count of a media descriptor object. Private Extern libvlc_media_release(p_md As Pointer)
' libvlc_release (libvlc_instance_t * p_instance) ' Decrement the reference count of a libvlc instance, and destroy it if it reaches zero. Private Extern libvlc_release(p_instance As Pointer)
Public Sub ToggleButton1_Click()
Dim inst, mp, m As Pointer
If ToggleButton1.Value Then
' Inizializza e imposta le opzioni relative al video: ' ["vcodec=mp4v,fps=30,vb=512"] ' ["vcodec=flv,fps=30,vb=512"]
inst = libvlc_new(1, ["vcodec=h264,fps=30,vb=512"]) If inst == 0 Then Error.Raise("Impossibile inizializzare la libreria VLC !")
' Crea il media player:
mp = libvlc_media_player_new(inst) If mp == 0 Then Error.Raise("Impossibile creare il media player !")
' Crea un nuovo oggetto multimedia. ' Nel secondo argomento della funzione va specificato il percorso del file-device video:
m = libvlc_media_new_location(inst, "http://wzstreaming.rai.it/TVlive/liveStream/playlist.m3u8") If m == 0 Then Error.Raise("Impossibile creare un oggetto multimediale !")
' Viene aggiunta l'opzione per la registrazione dell'audio mediante il sistema ALSA:
libvlc_media_add_option(m, ":sout=#transcode{acodec=mp3,ab=192,channels=2,samplerate=44100,deinterlace} :duplicate{dst=display,dst=std{access=file,mux=avi,dst=/tmp/zzz.avi}}") ' ":sout=#transcode{acodec=mp3,ab=192,channels=2,samplerate=44100,deinterlace} :duplicate{dst=display,dst=std{access=file,mux=flv,dst=/tmp/zzz.flv}}") ' ":sout=#transcode{acodec=mp3,ab=192,channels=2,samplerate=44100,deinterlace} :duplicate{dst=display,dst=std{access=file,mux=mp4,dst=/tmp/zzz.mp4}}") libvlc_media_player_set_media(mp, m)
' Avvia la cattura del video-audio da parte del media player:
libvlc_media_player_play(mp) While bo = False Me.Title = Str(Time(0, 0, 0, libvlc_media_player_get_time(mp)))
' Il Wait consente di agire su altri oggetti posti sul Form:
Wait 0.01 Wend
' Chiude la libreria VLC ed il programma:
libvlc_media_player_release(mp) libvlc_media_release(m) libvlc_release(inst) Me.Close
Else ' Causa l'arresto della registrazione, la chiusura della libreria VLC e del programma:
bo = True Endif
End