Differenze tra le versioni di "Ottenere un file audio da un file MIDI mediante il Componente gb.media"
Da Gambas-it.org - Wikipedia.
Riga 32: | Riga 32: | ||
flt = New MediaFilter(pl, "<FONT color=#B22222>audio/x-raw,format=S16LE,rate=44100,channels=2,depth=16</font>") | flt = New MediaFilter(pl, "<FONT color=#B22222>audio/x-raw,format=S16LE,rate=44100,channels=2,depth=16</font>") | ||
vol = New MediaControl(pl, "<FONT color=#B22222>volume</font>") | vol = New MediaControl(pl, "<FONT color=#B22222>volume</font>") | ||
− | vol["volume"] = 0.4 <FONT color=gray>' ''<1.0 volume <100% | + | vol["volume"] = 0.4 <FONT color=gray>' ''<1.0 = volume <100% | 1.0 = volume 100% | >1.0 = volume >100%''</font> |
enc = New MediaControl(pl, "<FONT color=#B22222>wavenc</font>") | enc = New MediaControl(pl, "<FONT color=#B22222>wavenc</font>") | ||
snk = New MediaControl(pl, "<FONT color=#B22222>filesink</font>") | snk = New MediaControl(pl, "<FONT color=#B22222>filesink</font>") | ||
Riga 91: | Riga 91: | ||
cnv = New MediaControl(pl, "<FONT color=#B22222>audioconvert</font>") | cnv = New MediaControl(pl, "<FONT color=#B22222>audioconvert</font>") | ||
vol = New MediaControl(pl, "<FONT color=#B22222>volume</font>") | vol = New MediaControl(pl, "<FONT color=#B22222>volume</font>") | ||
− | vol["volume"] = 0.4 <FONT color=gray>' ''<1.0 volume <100% | + | vol["volume"] = 0.4 <FONT color=gray>' ''<1.0 = volume <100% | 1.0 = volume 100% | >1.0 = volume >100%''</font> |
vor = New MediaControl(pl, "<FONT color=#B22222>vorbisenc</font>") | vor = New MediaControl(pl, "<FONT color=#B22222>vorbisenc</font>") | ||
mux = New MediaControl(pl, "<FONT color=#B22222>oggmux</font>") | mux = New MediaControl(pl, "<FONT color=#B22222>oggmux</font>") | ||
Riga 151: | Riga 151: | ||
cnv = New MediaControl(pl, "<FONT color=#B22222>audioconvert</font>") | cnv = New MediaControl(pl, "<FONT color=#B22222>audioconvert</font>") | ||
vol = New MediaControl(pl, "<FONT color=#B22222>volume</font>") | vol = New MediaControl(pl, "<FONT color=#B22222>volume</font>") | ||
− | vol["volume"] = 0.4 <FONT color=gray>' ''<1.0 volume <100% | + | vol["volume"] = 0.4 <FONT color=gray>' ''<1.0 = volume <100% | 1.0 = volume 100% | >1.0 = volume >100%''</font> |
lam = New MediaControl(pl, "<FONT color=#B22222>lamemp3enc</font>") | lam = New MediaControl(pl, "<FONT color=#B22222>lamemp3enc</font>") | ||
snk = New MediaControl(pl, "<FONT color=#B22222>filesink</font>") | snk = New MediaControl(pl, "<FONT color=#B22222>filesink</font>") |
Versione delle 02:19, 16 apr 2023
Utilizzando i plugin di GStreamer con le Classi MediaControl e MediaPipeline del Componente gb.media, è possibile ottenere un file audio da un file MIDI.
I plugin specifici da utilizzare per il MIDI sono:
- midiparse: interpreta i file MIDI e li converte in eventi MIDI;
- fluiddec: effettua il render degli eventi MIDI in campioni audio grezzi.
Mostriamo di seguito un esempio pratico, nel quale si otterrà un file WAV da un file MIDI:
Private bo As Boolean Public Sub Main() Dim filemidi, datigrezzi As String Dim pl As MediaPipeline Dim src, par, fdc, res, cnv, vol, enc, snk As MediaControl Dim flt As MediaFilter filemidi = "/percorso/del/file.mid" datigrezzi = Temp pl = New MediaPipeline As "PLine" src = New MediaControl(pl, "filesrc") src["location"] = filemidi par = New MediaControl(pl, "midiparse") fdc = New MediaControl(pl, "fluiddec") res = New MediaControl(pl, "audioresample") cnv = New MediaControl(pl, "audioconvert") flt = New MediaFilter(pl, "audio/x-raw,format=S16LE,rate=44100,channels=2,depth=16") vol = New MediaControl(pl, "volume") vol["volume"] = 0.4 ' <1.0 = volume <100% | 1.0 = volume 100% | >1.0 = volume >100% enc = New MediaControl(pl, "wavenc") snk = New MediaControl(pl, "filesink") snk["location"] = datigrezzi src.LinkTo(par) par.LinkTo(fdc) fdc.LinkTo(res) res.LinkTo(cnv) cnv.LinkTo(flt) flt.LinkTo(vol) vol.LinkTo(enc) enc.LinkTo(snk) pl.Play() Print "Durata del file Midi: "; Str(Time(0, 0, 0, pl.Duration * 1000)) Repeat Write "\r\e[0mTempo convertito: \e[31m" & Str(Time(0, 0, 0, pl.Position * 1000)) Wait 0.01 Until bo Copy datigrezzi To "/tmp" &/ File.BaseName(filemidi) & ".wav" pl.Close Print "\n\e[0mConversione terminata !" End Public Sub PLine_End() ' Questo Evento viene sollevato, quando la conversione è terminata bo = True End
In quest'altro esempio si otterrà un file OGG-Vorbis da un file MIDI:
Private bo As Boolean Public Sub Main() Dim filemidi, datigrezzi As String Dim pl As MediaPipeline Dim src, par, fdc, res, cnv, vol, vor, mux, snk As MediaControl filemidi = "/percorso/del/file.mid" datigrezzi = Temp pl = New MediaPipeline As "PLine" src = New MediaControl(pl, "filesrc") src["location"] = filemidi par = New MediaControl(pl, "midiparse") fdc = New MediaControl(pl, "fluiddec") res = New MediaControl(pl, "audioresample") cnv = New MediaControl(pl, "audioconvert") vol = New MediaControl(pl, "volume") vol["volume"] = 0.4 ' <1.0 = volume <100% | 1.0 = volume 100% | >1.0 = volume >100% vor = New MediaControl(pl, "vorbisenc") mux = New MediaControl(pl, "oggmux") snk = New MediaControl(pl, "filesink") snk["location"] = datigrezzi src.LinkTo(par) par.LinkTo(fdc) fdc.LinkTo(res) res.LinkTo(cnv) cnv.LinkTo(vol) vol.LinkTo(vor) vor.LinkTo(mux) mux.LinkTo(snk) pl.Play() Print "Durata del file Midi: "; Str(Time(0, 0, 0, pl.Duration * 1000)) Repeat Write "\r\e[0mTempo convertito: \e[31m" & Str(Time(0, 0, 0, pl.Position * 1000)) Wait 0.01 Until bo Copy datigrezzi To "/tmp" &/ File.BaseName(filemidi) & ".ogg" pl.Close Print "\n\e[0mConversione terminata !" End Public Sub PLine_End() bo = True End
In questo terzo esempio si otterrà un file MP3 da un file MIDI:
Private bo As Boolean Public Sub Main() Dim filemidi, datigrezzi As String Dim pl As MediaPipeline Dim src, par, fdc, res, cnv, vol, lam, snk As MediaControl filemidi = "/percorso/del/file.mid" datigrezzi = Temp pl = New MediaPipeline As "PLine" src = New MediaControl(pl, "filesrc") src["location"] = filemidi par = New MediaControl(pl, "midiparse") fdc = New MediaControl(pl, "fluiddec") res = New MediaControl(pl, "audioresample") cnv = New MediaControl(pl, "audioconvert") vol = New MediaControl(pl, "volume") vol["volume"] = 0.4 ' <1.0 = volume <100% | 1.0 = volume 100% | >1.0 = volume >100% lam = New MediaControl(pl, "lamemp3enc") snk = New MediaControl(pl, "filesink") snk["location"] = datigrezzi src.LinkTo(par) par.LinkTo(fdc) fdc.LinkTo(res) res.LinkTo(cnv) cnv.LinkTo(vol) vol.LinkTo(lam) lam.LinkTo(snk) pl.Play() Print "Durata del file Midi: "; Str(Time(0, 0, 0, pl.Duration * 1000)) Repeat Write "\r\e[0mTempo convertito: \e[31m" & Str(Time(0, 0, 0, pl.Position * 1000)) Wait 0.01 Until bo Copy datigrezzi To "/tmp" &/ File.BaseName(filemidi) & ".mp3" pl.Close Print "\n\e[0mConversione terminata !" End Public Sub PLine_End() bo = True End