Differenze tra le versioni di "Conoscere la durata di un file Midi mediante le funzioni esterne del API di Libsmf"
Da Gambas-it.org - Wikipedia.
Riga 47: | Riga 47: | ||
smf_delete(smf) | smf_delete(smf) | ||
− | Print "Durata del file Midi: "; | + | Print "Durata del file Midi: "; Time(0, 0, 0, durata * 1000) |
'''End''' | '''End''' | ||
− | |||
Versione delle 17:38, 12 giu 2021
La libreria Libsmf, ideata per la gestione degli standard Midi File, consente, fra l'altro, di conoscere la durata in secondi di un file Midi.
E' necessario aver installata e richiamare la libreria condivisa: "libsmf:0.0.0"
Mostriamo un semplice esempio:
Library "libsmf:0.0.0" Public Struct smf_struct formati As Integer ppqn As Integer frames_per_second As Integer resolution As Integer number_of_tracks As Integer streamf As Pointer file_buffer As Pointer file_buffer_length As Integer next_chunk_offset As Integer expected_number_of_tracks As Integer tracks_array As Pointer last_seek_position As Float tempo_array As Pointer End Struct ' smf_t* smf_load (const char * file_name) ' Loads SMF file. Private Extern smf_load(file_name As String) As Pointer ' double smf_get_length_seconds (const smf_t * smf) ' Length of SMF, in seconds. Private Extern smf_get_length_seconds(smf_t As Smf_struct) As Float ' void smf_delete (smf_t *smf) ' Frees smf and all it's descendant structures. Private Extern smf_delete(smf As Smf_struct) Public Sub Main() Dim smf As smf_struct Dim durata As Float smf = smf_load("/percorso/del/file.mid") durata = smf_get_length_seconds(smf) smf_delete(smf) Print "Durata del file Midi: "; Time(0, 0, 0, durata * 1000) End