Differenze tra le versioni di "Eseguire un file Video con le funzioni esterne del API di Libmpv"
Da Gambas-it.org - Wikipedia.
(5 versioni intermedie di uno stesso utente non sono mostrate) | |||
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La libreria esterna '''Libmpv''' consente di eseguire diversi formati di file video. | La libreria esterna '''Libmpv''' consente di eseguire diversi formati di file video. | ||
− | Per poter utilizzare le risorse di ''Mpv'', è necessario avere installata e richiamare in Gambas la libreria condivisa: "''libmpv.so. | + | Per poter utilizzare le risorse di ''Mpv'', è necessario avere installata e richiamare in Gambas la libreria condivisa: "''libmpv.so.2.3.0'' ". |
Mostriamo un semplice esempio: | Mostriamo un semplice esempio: | ||
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− | Library "libmpv: | + | Library "libmpv:2.3.0" |
Private Enum MPV_FORMAT_NONE = 0, MPV_FORMAT_STRING, MPV_FORMAT_OSD_STRING, MPV_FORMAT_FLAG, | Private Enum MPV_FORMAT_NONE = 0, MPV_FORMAT_STRING, MPV_FORMAT_OSD_STRING, MPV_FORMAT_FLAG, | ||
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− | + | Public Sub Main() | |
Dim mpv As Pointer | Dim mpv As Pointer | ||
Riga 50: | Riga 50: | ||
Dim d, l, v As Long | Dim d, l, v As Long | ||
− | fileaudio = "<FONT Color= | + | fileaudio = "<FONT Color=darkgreen>''/percorso/del/file/video''</font>" |
Print "File audio: "; fileaudio | Print "File audio: "; fileaudio | ||
Print | Print | ||
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mpv_command(mpv, ["loadfile", fileaudio, Null]) | mpv_command(mpv, ["loadfile", fileaudio, Null]) | ||
− | <FONT Color=gray>' ''Imposta il volume. 0 significa silenzio | + | <FONT Color=gray>' ''Imposta il volume. 0 significa silenzio; 100 significa nessuna riduzione del volume o amplificazione rispetto al valore originario. Valori superiori a 100 amplificano il volume di uscita rispetto al valore originario.''</font> |
− | |||
v = 50 | v = 50 | ||
mpv_set_property(mpv, "volume", MPV_FORMAT_INT64, VarPtr(v)) | mpv_set_property(mpv, "volume", MPV_FORMAT_INT64, VarPtr(v)) | ||
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Repeat | Repeat | ||
mpv_get_property(mpv, "time-pos", MPV_FORMAT_INT64, VarPtr(l)) | mpv_get_property(mpv, "time-pos", MPV_FORMAT_INT64, VarPtr(l)) | ||
− | Write "\e[0m\rDurata: " & | + | Write "\e[0m\rDurata: " & Time(0, 0, 0, CInt(d) * 1000) & |
− | " Tempo trascorso: \e[31m" & | + | " Tempo trascorso: \e[31m" & Time(0, 0, 0, CInt(l) * 1000) |
Wait 0.001 | Wait 0.001 | ||
Until l >= d | Until l >= d | ||
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mpv_terminate_destroy(mpv) | mpv_terminate_destroy(mpv) | ||
− | + | End | |
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− | Library "libmpv: | + | Library "libmpv:2.3.0" |
Public Struct mpv_event | Public Struct mpv_event | ||
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− | + | Public Sub Main() | |
Dim mpv As Pointer | Dim mpv As Pointer | ||
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Dim ev As Mpv_event | Dim ev As Mpv_event | ||
− | cmd[1] = "<FONT Color= | + | cmd[1] = "<FONT Color=darkgreen>''/percorso/del/file/video''</font>" |
setlocale(LC_NUMERIC, "C") | setlocale(LC_NUMERIC, "C") | ||
Riga 179: | Riga 178: | ||
Terminus(mpv) | Terminus(mpv) | ||
− | + | End | |
− | + | ||
+ | Private Procedure Terminus(po As Pointer) | ||
mpv_terminate_destroy(po) | mpv_terminate_destroy(po) | ||
− | + | End | |
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− | Library "libmpv: | + | Library "libmpv:2.3.0" |
Public Struct mpv_event | Public Struct mpv_event | ||
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− | + | Public Sub Button1_Click() | |
Dim mpv As Pointer | Dim mpv As Pointer | ||
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Dim ev As Mpv_event | Dim ev As Mpv_event | ||
− | cmd[1] = "<FONT Color= | + | cmd[1] = "<FONT Color=darkgreen>''/percorso/del/file/video''</font>" |
setlocale(LC_NUMERIC, "C") | setlocale(LC_NUMERIC, "C") | ||
Riga 291: | Riga 291: | ||
Terminus(mpv) | Terminus(mpv) | ||
− | + | End | |
+ | |||
− | + | Private Procedure Terminus(po As Pointer) | |
mpv_terminate_destroy(po) | mpv_terminate_destroy(po) | ||
− | + | End | |
Riga 303: | Riga 304: | ||
=Riferimenti= | =Riferimenti= | ||
* https://mpv.io/manual/ | * https://mpv.io/manual/ | ||
+ | * https://github.com/mpv-player/mpv/tree/master/DOCS/man |
Versione attuale delle 04:32, 4 giu 2024
La libreria esterna Libmpv consente di eseguire diversi formati di file video.
Per poter utilizzare le risorse di Mpv, è necessario avere installata e richiamare in Gambas la libreria condivisa: "libmpv.so.2.3.0 ".
Mostriamo un semplice esempio:
Library "libc:6" Private Const LC_NUMERIC As Integer = 1 ' char *setlocale (int __category, const char *__locale) ' Set and/or return the current locale. Private Extern setlocale(__category As Integer, __locale As String) As Pointer Library "libmpv:2.3.0" Private Enum MPV_FORMAT_NONE = 0, MPV_FORMAT_STRING, MPV_FORMAT_OSD_STRING, MPV_FORMAT_FLAG, MPV_FORMAT_INT64, MPV_FORMAT_DOUBLE, MPV_FORMAT_NODE, MPV_FORMAT_NODE_ARRAY, MPV_FORMAT_NODE_MAP, MPV_FORMAT_BYTE_ARRAY ' mpv_handle *mpv_create(void) ' Create a new mpv instance. Private Extern mpv_create() As Pointer ' int mpv_initialize(mpv_handle *ctx) ' Initialize an uninitialized mpv instance. Private Extern mpv_initialize(ctx As Pointer) As Integer ' int mpv_command(mpv_handle *ctx, const char **args) ' Send a command to the player. Private Extern mpv_command(ctx As Pointer, args As String[]) As Integer ' int mpv_set_property(mpv_handle *ctx, const char *name, mpv_format format, void *data) ' Set a property. Private Extern mpv_set_property(ctx As Pointer, name As String, format_ As Integer, data As Pointer) As Integer ' int mpv_get_property(mpv_handle *ctx, const char *name, mpv_format format, void *data) ' Read the value of the given property. Private Extern mpv_get_property(ctx As Pointer, name As String, format_ As Integer, data As Pointer) As Integer ' void mpv_terminate_destroy(mpv_handle *ctx) ' Disconnect and destroy the mpv_handle. Private Extern mpv_terminate_destroy(ctx As Pointer) Public Sub Main() Dim mpv As Pointer Dim fileaudio As String Dim d, l, v As Long fileaudio = "/percorso/del/file/video" Print "File audio: "; fileaudio Print setlocale(LC_NUMERIC, "C") mpv = mpv_create() If mpv == 0 Then Error.Raise("Errore !") mpv_initialize(mpv) mpv_command(mpv, ["loadfile", fileaudio, Null]) ' Imposta il volume. 0 significa silenzio; 100 significa nessuna riduzione del volume o amplificazione rispetto al valore originario. Valori superiori a 100 amplificano il volume di uscita rispetto al valore originario. v = 50 mpv_set_property(mpv, "volume", MPV_FORMAT_INT64, VarPtr(v)) Repeat mpv_get_property(mpv, "duration", MPV_FORMAT_INT64, VarPtr(d)) Until d > 0 ' Si esce dal ciclo, solo quando sarà rilevata la durata del file video Repeat mpv_get_property(mpv, "time-pos", MPV_FORMAT_INT64, VarPtr(l)) Write "\e[0m\rDurata: " & Time(0, 0, 0, CInt(d) * 1000) & " Tempo trascorso: \e[31m" & Time(0, 0, 0, CInt(l) * 1000) Wait 0.001 Until l >= d mpv_terminate_destroy(mpv) End
Un'altra soluzione simile per ottenere alla fine dell'esecuzione la chiusura del programma:
Library "libc:6" Private Const LC_NUMERIC As Integer = 1 ' char *setlocale (int __category, const char *__locale) ' Set and/or return the current locale. Private Extern setlocale(__category As Integer, __locale As String) As Pointer Library "libmpv:2.3.0" Public Struct mpv_event event_id As Integer error_ As Integer reply_userdata As Long data As Pointer End Struct Private Const MPV_FORMAT_INT64 As Integer = 4 Private Const MPV_EVENT_END_FILE As Integer = 7 ' mpv_handle *mpv_create(void) ' Create a new mpv instance. Private Extern mpv_create() As Pointer ' int mpv_initialize(mpv_handle *ctx) ' Initialize an uninitialized mpv instance. Private Extern mpv_initialize(ctx As Pointer) As Integer ' int mpv_command(mpv_handle *ctx, const char **args) ' Send a command to the player. Private Extern mpv_command(ctx As Pointer, args As String[]) As Integer ' int mpv_set_property(mpv_handle *ctx, const char *name, mpv_format format, void *data) ' Set a property. Private Extern mpv_set_property(ctx As Pointer, name As String, format_ As Integer, data As Pointer) As Integer ' int mpv_get_property(mpv_handle *ctx, const char *name, mpv_format format, void *data) ' Read the value of the given property. Private Extern mpv_get_property(ctx As Pointer, name As String, format_ As Integer, data As Pointer) As Integer ' mpv_event *mpv_wait_event(mpv_handle *ctx, double timeout) ' Wait for the next event, or until the timeout expires. Private Extern mpv_wait_event(ctx As Pointer, timeout As Float) As Mpv_event ' void mpv_terminate_destroy(mpv_handle *ctx) ' Disconnect and destroy the mpv_handle. Private Extern mpv_terminate_destroy(ctx As Pointer) Public Sub Main() Dim mpv As Pointer Dim err As Integer Dim v As Long Dim cmd As String[] = ["loadfile", Null, Null] Dim ev As Mpv_event cmd[1] = "/percorso/del/file/video" setlocale(LC_NUMERIC, "C") mpv = mpv_create() If mpv == 0 Then Error.Raise("Errore !") err = mpv_initialize(mpv) If err < 0 Then Terminus(mpv) Error.Raise("Errore !") Endif err = mpv_command(mpv, cmd) If err < 0 Then Terminus(mpv) Error.Raise("Errore !") Endif ' Imposta il Volume: ' 0 = muto; ' 100 = nessuna variazione di volume; ' >100 = aumento del volume rispetto al valore originario. v = 50 mpv_set_property(mpv, "volume", MPV_FORMAT_INT64, VarPtr(v)) Repeat ' Acquisisce la corrente posizione del video espressa in secondi trascorsi dall'inizio dell'esecuzione: mpv_get_property(mpv, "time-pos", MPV_FORMAT_INT64, VarPtr(v)) Write "\r\e[31m" & Str(Time(0, 0, 0, v * 1000)) Flush ev = mpv_wait_event(mpv, 1) Until ev.event_id == MPV_EVENT_END_FILE ' Il ciclo termina, quando termina l'esecuzione del file video Terminus(mpv) End Private Procedure Terminus(po As Pointer) mpv_terminate_destroy(po) End
Con applicazione grafica mostrando il video in una DrawingArea posta sul Form
Nel seguente codice si useranno risorse grafiche e si farà mostrare il video all'interno di una "DrawingArea" posta sul "Form" principale.
Library "libc:6" Private Const LC_NUMERIC As Integer = 1 ' char *setlocale (int __category, const char *__locale) ' Set and/or return the current locale. Private Extern setlocale(__category As Integer, __locale As String) As Pointer Library "libmpv:2.3.0" Public Struct mpv_event event_id As Integer error_ As Integer reply_userdata As Long data As Pointer End Struct Private Enum MPV_FORMAT_INT64 = 4 Private Const MPV_EVENT_END_FILE As Integer = 7 ' mpv_handle *mpv_create(void) ' Create a new mpv instance. Private Extern mpv_create() As Pointer ' int mpv_initialize(mpv_handle *ctx) ' Initialize an uninitialized mpv instance. Private Extern mpv_initialize(ctx As Pointer) As Integer ' int mpv_command(mpv_handle *ctx, const char **args) ' Send a command to the player. Private Extern mpv_command(ctx As Pointer, args As String[]) As Integer ' int mpv_set_property(mpv_handle *ctx, const char *name, mpv_format format, void *data) ' Set a property. Private Extern mpv_set_property(ctx As Pointer, name As String, format_ As Integer, data As Pointer) As Integer ' int mpv_set_option_string(mpv_handle *ctx, const char *name, const char *data) ' Set an option to a string value. Private Extern mpv_set_option_string(ctx As Pointer, Name As String, Data As String) As Integer ' int mpv_get_property(mpv_handle *ctx, const char *name, mpv_format format, void *data) ' Read the value of the given property. Private Extern mpv_get_property(ctx As Pointer, name As String, format_ As Integer, data As Pointer) As Integer ' mpv_event *mpv_wait_event(mpv_handle *ctx, double timeout) ' Wait for the next event, or until the timeout expires. Private Extern mpv_wait_event(ctx As Pointer, timeout As Float) As Mpv_event ' void mpv_terminate_destroy(mpv_handle *ctx) ' Disconnect and destroy the mpv_handle. Private Extern mpv_terminate_destroy(ctx As Pointer) Public Sub Button1_Click() Dim mpv As Pointer Dim err As Integer Dim cmd As String[] = ["loadfile", Null, Null] Dim v As Long Dim ev As Mpv_event cmd[1] = "/percorso/del/file/video" setlocale(LC_NUMERIC, "C") mpv = mpv_create() If mpv == 0 Then Error.Raise("Error !") err = mpv_initialize(mpv) If err < 0 Then Terminus(mpv) Error.Raise("Error !") Endif err = mpv_command(mpv, cmd) If err < 0 Then Terminus(mpv) Error.Raise("Error !") Endif ' Imposta il Volume: ' 0 = muto; ' 100 = nessuna variazione di volume; ' >100 = aumento del volume rispetto al valore originario. v = 50 mpv_set_property(mpv, "volume", MPV_FORMAT_INT64, VarPtr(v)) ' Imposta la superficie grafica (in questo caso la "DrawingArea" posta sul "Form"), ove mostrare il video: mpv_set_option_string(mpv, "wid", CStr(DrawingArea1.Id)) Repeat ' Acquisisce la corrente posizione del video espressa in secondi trascorsi dall'inizio dell'esecuzione: mpv_get_property(mpv, "time-pos", MPV_FORMAT_INT64, VarPtr(v)) Write "\r\e[31m" & Str(Time(0, 0, 0, v * 1000)) Flush ev = mpv_wait_event(mpv, 1) Until ev.event_id == MPV_EVENT_END_FILE ' Il ciclo termina, quando termina l'esecuzione del file video Terminus(mpv) End Private Procedure Terminus(po As Pointer) mpv_terminate_destroy(po) End