Differenze tra le versioni di "Eseguire un file audio mediante le funzioni esterne del API di Mpv"
Da Gambas-it.org - Wikipedia.
Riga 117: | Riga 117: | ||
' ''Send a command to the player.''</font> | ' ''Send a command to the player.''</font> | ||
Private Extern mpv_command(ctx As Pointer, args As String[]) As Integer | Private Extern mpv_command(ctx As Pointer, args As String[]) As Integer | ||
+ | |||
+ | <FONT Color=gray>' ''int mpv_set_property(mpv_handle *ctx, const char *name, mpv_format format, void *data)'' | ||
+ | ' ''Set a property.''</font> | ||
+ | Private Extern mpv_set_property(ctx As Pointer, name As String, format_ As Integer, data As Pointer) As Integer | ||
+ | |||
+ | <FONT Color=gray>' ''int mpv_get_property(mpv_handle *ctx, const char *name, mpv_format format, void *data)'' | ||
+ | ' ''Read the value of the given property.''</font> | ||
+ | Private Extern mpv_get_property(ctx As Pointer, name As String, format_ As Integer, data As Pointer) As Integer | ||
<FONT Color=gray>' ''mpv_event *mpv_wait_event(mpv_handle *ctx, double timeout)'' | <FONT Color=gray>' ''mpv_event *mpv_wait_event(mpv_handle *ctx, double timeout)'' | ||
Riga 127: | Riga 135: | ||
− | '''Public Sub Main() | + | '''Public''' Sub Main() |
Dim mpv As Pointer | Dim mpv As Pointer | ||
Dim err As Integer | Dim err As Integer | ||
+ | Dim v As Long | ||
Dim cmd As String[] = ["loadfile", Null, Null] | Dim cmd As String[] = ["loadfile", Null, Null] | ||
− | |||
Dim ev As Mpv_event | Dim ev As Mpv_event | ||
Riga 140: | Riga 148: | ||
mpv = mpv_create() | mpv = mpv_create() | ||
− | If mpv == 0 Then Error.Raise(" | + | If mpv == 0 Then Error.Raise("Errore !") |
err = mpv_initialize(mpv) | err = mpv_initialize(mpv) | ||
If err < 0 Then | If err < 0 Then | ||
Terminus(mpv) | Terminus(mpv) | ||
− | Error.Raise(" | + | Error.Raise("Errore !") |
Endif | Endif | ||
Riga 151: | Riga 159: | ||
If err < 0 Then | If err < 0 Then | ||
Terminus(mpv) | Terminus(mpv) | ||
− | Error.Raise(" | + | Error.Raise("Errore !") |
Endif | Endif | ||
− | + | <FONT Color=gray>' ''Imposta il Volume:'' | |
+ | ' '' 0 = muto;'' | ||
+ | ' '' 100 = nessuna variazione di volume;'' | ||
+ | ' ''>100 = aumento del volume rispetto al valore originario.''</font> | ||
+ | v = 50 | ||
+ | mpv_set_property(mpv, "volume", MPV_FORMAT_INT64, VarPtr(v)) | ||
Repeat | Repeat | ||
− | Write "\r\e[31m" & Str(Time(0, 0, 0, | + | <FONT Color=gray>' ''Acquisisce la corrente posizione del audio espressa in secondi trascorsi dall'inizio dell'esecuzione:'' </font> |
+ | mpv_get_property(mpv, "time-pos", MPV_FORMAT_INT64, VarPtr(v)) | ||
+ | Write "\r\e[31m" & Str(Time(0, 0, 0, v * 1000)) | ||
Flush | Flush | ||
ev = mpv_wait_event(mpv, 1) | ev = mpv_wait_event(mpv, 1) |
Versione delle 16:36, 25 mag 2021
La libreria esterna Libmpv consente di eseguire diversi formati di file audio.
Per poter utilizzare le risorse di Mpv, è necessario avere installata e richiamare in Gambas la libreria condivisa: "libmpv.so.1.107.0"
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:1.107.0" 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) ' 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/audio" 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. ' Valori superiori a 100 amplificano il volume di uscita. 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 audio Repeat mpv_get_property(mpv, "time-pos", MPV_FORMAT_INT64, VarPtr(l)) Write "\e[0m\rDurata: " & Date(0, 0, 0, 0, 0, 0, CInt(d) * 1000) & " Tempo trascorso: \e[31m" & Date(0, 0, 0, 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:1.107.0" 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/audio" 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 audio 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 audio Terminus(mpv) End Private Procedure Terminus(po As Pointer) mpv_terminate_destroy(po) End