Differenze tra le versioni di "Ottenere un file audio da un file MIDI mediante il Componente gb.media"
Da Gambas-it.org - Wikipedia.
(22 versioni intermedie di uno stesso utente non sono mostrate) | |||
Riga 4: | Riga 4: | ||
* ''midiparse'': interpreta i file MIDI e li converte in eventi MIDI; | * ''midiparse'': interpreta i file MIDI e li converte in eventi MIDI; | ||
* ''fluiddec'': effettua il render degli eventi MIDI in campioni audio grezzi. | * ''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: | 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 As String | ||
Dim pl As MediaPipeline | Dim pl As MediaPipeline | ||
− | Dim src, par, fdc, res | + | Dim src, par, fdc, con, res, vol, enc, snk As MediaControl |
Dim flt As MediaFilter | Dim flt As MediaFilter | ||
− | + | ||
− | + | filemidi = "<FONT color=darkgreen>''/percorso/del/file.mid''</font>" | |
− | filemidi = "<FONT color= | + | |
− | + | pl = New MediaPipeline As "PLine" | |
− | + | ||
− | pl = New MediaPipeline | ||
− | |||
src = New MediaControl(pl, "<FONT color=#B22222>filesrc</font>") | src = New MediaControl(pl, "<FONT color=#B22222>filesrc</font>") | ||
− | src["location"] = filemidi | + | src["location"] = filemidi |
par = New MediaControl(pl, "<FONT color=#B22222>midiparse</font>") | par = New MediaControl(pl, "<FONT color=#B22222>midiparse</font>") | ||
fdc = New MediaControl(pl, "<FONT color=#B22222>fluiddec</font>") | fdc = New MediaControl(pl, "<FONT color=#B22222>fluiddec</font>") | ||
+ | con = New MediaControl(pl, "<FONT color=#B22222>audioconvert</font>") | ||
res = New MediaControl(pl, "<FONT color=#B22222>audioresample</font>") | res = New MediaControl(pl, "<FONT color=#B22222>audioresample</font>") | ||
− | + | 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,rate=44100,channels=2</font>") | ||
vol = New MediaControl(pl, "<FONT color=#B22222>volume</font>") | vol = New MediaControl(pl, "<FONT color=#B22222>volume</font>") | ||
− | vol["volume"] = | + | vol["volume"] = 0.5 <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>") | ||
− | snk["location"] = | + | snk["location"] = "/tmp" &/ File.BaseName(filemidi) & ".wav" |
− | + | ||
src.LinkTo(par) | src.LinkTo(par) | ||
par.LinkTo(fdc) | par.LinkTo(fdc) | ||
− | fdc.LinkTo( | + | fdc.LinkTo(con) |
− | + | con.LinkTo(res) | |
− | + | res.LinkTo(flt) | |
flt.LinkTo(vol) | flt.LinkTo(vol) | ||
vol.LinkTo(enc) | vol.LinkTo(enc) | ||
enc.LinkTo(snk) | enc.LinkTo(snk) | ||
+ | |||
+ | pl.Play() | ||
+ | |||
+ | Print "Durata del file Midi: "; Str(Time(0, 0, 0, pl.Duration * 1000)) | ||
+ | While Not bo | ||
+ | Write "\r\e[0mTempo di conversione: \e[31m" & Str(Time(0, 0, 0, pl.Position * 1000)) | ||
+ | Wait 0.01 | ||
+ | Wend | ||
+ | |||
+ | pl.Stop | ||
+ | pl.Close | ||
+ | |||
+ | Print "\n\e[0mConversione terminata !" | ||
+ | |||
+ | End | ||
+ | |||
+ | |||
+ | Public Sub PLine_'''End'''() <FONT Color=gray>' ''Questo Evento viene sollevato, quando la conversione è terminata''</font> | ||
+ | |||
+ | 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 As String | ||
+ | Dim pl As MediaPipeline | ||
+ | Dim src, par, fdc, con, res, vol, vor, mux, snk As MediaControl | ||
+ | |||
+ | filemidi = "<FONT color=darkgreen>''/percorso/del/file.mid''</font>" | ||
+ | |||
+ | pl = New MediaPipeline As "PLine" | ||
+ | |||
+ | src = New MediaControl(pl, "<FONT color=#B22222>filesrc</font>") | ||
+ | src["location"] = filemidi | ||
+ | |||
+ | par = New MediaControl(pl, "<FONT color=#B22222>midiparse</font>") | ||
+ | fdc = New MediaControl(pl, "<FONT color=#B22222>fluiddec</font>") | ||
+ | con = New MediaControl(pl, "<FONT color=#B22222>audioconvert</font>") | ||
+ | res = New MediaControl(pl, "<FONT color=#B22222>audioresample</font>") | ||
+ | vol = New MediaControl(pl, "<FONT color=#B22222>volume</font>") | ||
+ | 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>") | ||
+ | mux = New MediaControl(pl, "<FONT color=#B22222>oggmux</font>") | ||
+ | snk = New MediaControl(pl, "<FONT color=#B22222>filesink</font>") | ||
+ | snk["location"] = "/tmp" &/ File.BaseName(filemidi) & ".ogg" | ||
+ | |||
+ | 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)) | ||
+ | While Not bo | ||
+ | Write "\r\e[0mTempo conversione: \e[31m" & Str(Time(0, 0, 0, pl.Position * 1000)) | ||
+ | Wait 0.01 | ||
+ | Wend | ||
+ | |||
+ | pl.Stop | ||
+ | pl.Close | ||
+ | |||
+ | Print "\n\e[0mConversione terminata !" | ||
+ | |||
+ | End | ||
+ | |||
+ | Public Sub PLine_End() <FONT Color=gray>' ''Questo Evento viene sollevato, quando la conversione è terminata''</font> | ||
+ | |||
+ | 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 As String | ||
+ | Dim pl As MediaPipeline | ||
+ | Dim src, par, fdc, con, res, vol, lam, snk As MediaControl | ||
+ | |||
+ | filemidi = "<FONT color=darkgreen>''/percorso/del/file.mid''</font>" | ||
+ | |||
+ | pl = New MediaPipeline As "PLine" | ||
+ | |||
+ | src = New MediaControl(pl, "<FONT color=#B22222>filesrc</font>") | ||
+ | src["location"] = filemidi | ||
+ | |||
+ | par = New MediaControl(pl, "<FONT color=#B22222>midiparse</font>") | ||
+ | fdc = New MediaControl(pl, "<FONT color=#B22222>fluiddec</font>") | ||
+ | con = New MediaControl(pl, "<FONT color=#B22222>audioconvert</font>") | ||
+ | res = New MediaControl(pl, "<FONT color=#B22222>audioresample</font>") | ||
+ | vol = New MediaControl(pl, "<FONT color=#B22222>volume</font>") | ||
+ | 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>") | ||
+ | snk = New MediaControl(pl, "<FONT color=#B22222>filesink</font>") | ||
+ | snk["location"] = "/tmp" &/ File.BaseName(filemidi) & ".mp3" | ||
+ | |||
+ | 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)) | ||
+ | While Not bo | ||
+ | Write "\r\e[0mTempo conversione: \e[31m" & Str(Time(0, 0, 0, pl.Position * 1000)) | ||
+ | Wait 0.01 | ||
+ | Wend | ||
+ | |||
+ | pl.Stop | ||
+ | pl.Close | ||
+ | |||
+ | Print "\n\e[0mConversione terminata !" | ||
+ | |||
+ | End | ||
+ | |||
+ | |||
+ | Public Sub PLine_End() <FONT Color=gray>' ''Questo Evento viene sollevato, quando la conversione è terminata''</font> | ||
+ | |||
+ | bo = True | ||
+ | |||
+ | End | ||
+ | In questo quarto esempio si otterrà un file AAC da un file MIDI: | ||
+ | Private bo As Boolean | ||
+ | |||
+ | |||
+ | Public Sub Main() | ||
+ | |||
+ | Dim filemidi As String | ||
+ | Dim pl As MediaPipeline | ||
+ | Dim src, par, fdc, con, res, vol, faa, snk As MediaControl | ||
+ | Dim flt1, flt2 As MediaFilter | ||
+ | |||
+ | filemidi = "<FONT color=darkgreen>''/percorso/del/file.mid''</font>" | ||
+ | |||
+ | pl = New MediaPipeline As "PLine" | ||
+ | |||
+ | src = New MediaControl(pl, "<FONT color=#B22222>filesrc</font>") | ||
+ | src["location"] = filemidi | ||
+ | par = New MediaControl(pl, "<FONT color=#B22222>midiparse</font>") | ||
+ | fdc = New MediaControl(pl, "<FONT color=#B22222>fluiddec</font>") | ||
+ | con = New MediaControl(pl, "<FONT color=#B22222>audioconvert</font>") | ||
+ | res = New MediaControl(pl, "<FONT color=#B22222>audioresample</font>") | ||
+ | flt1 = 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["volume"] = 1.0 <FONT color=gray>' ''<1.0 = volume <100% | 1.0 = volume 100% | >1.0 = volume >100%''</font> | ||
+ | faa = New MediaControl(pl, "<FONT color=#B22222>faac</font>") | ||
+ | flt2 = New MediaFilter(pl, "audio/mpeg,stream-format=adts,channels=2,rate=44100") | ||
+ | snk = New MediaControl(pl, "<FONT color=#B22222>filesink</font>") | ||
+ | snk["location"] = "/tmp" &/ File.BaseName(filemidi) & ".aac" | ||
+ | |||
+ | src.LinkTo(par) | ||
+ | par.LinkTo(fdc) | ||
+ | fdc.LinkTo(con) | ||
+ | con.LinkTo(res) | ||
+ | res.LinkTo(flt1) | ||
+ | flt1.LinkTo(vol) | ||
+ | vol.LinkTo(faa) | ||
+ | faa.LinkTo(flt2) | ||
+ | flt2.LinkTo(snk) | ||
+ | |||
pl.Play() | pl.Play() | ||
− | + | ||
− | Print " | + | Print "Durata del file Midi: "; Str(Time(0, 0, 0, pl.Duration * 1000)) |
− | + | While Not bo | |
− | + | Write "\r\e[0mTempo di conversione: \e[31m" & Str(Time(0, 0, 0, pl.Position * 1000)) | |
− | Write "\r\e[0mTempo | + | Wait 0.01 |
− | + | Wend | |
− | + | ||
− | |||
− | |||
pl.Stop | pl.Stop | ||
pl.Close | pl.Close | ||
− | + | ||
− | ''' | + | Print "\n\e[0mConversione terminata !" |
− | + | ||
+ | End | ||
+ | |||
+ | |||
+ | Public Sub PLine_End() <FONT Color=gray>' ''Questo Evento viene sollevato, quando la conversione è terminata''</font> | ||
+ | |||
+ | bo = True | ||
+ | |||
+ | End | ||
=Riferimenti= | =Riferimenti= | ||
− | * https:// | + | * https://github.com/Xilinx/gstreamer/blob/master/docs/random/uraeus/gstreamer_and_midi.txt |
Versione attuale delle 19:44, 17 gen 2024
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 As String Dim pl As MediaPipeline Dim src, par, fdc, con, res, vol, enc, snk As MediaControl Dim flt As MediaFilter filemidi = "/percorso/del/file.mid" pl = New MediaPipeline As "PLine" src = New MediaControl(pl, "filesrc") src["location"] = filemidi par = New MediaControl(pl, "midiparse") fdc = New MediaControl(pl, "fluiddec") con = New MediaControl(pl, "audioconvert") res = New MediaControl(pl, "audioresample") flt = New MediaFilter(pl, "audio/x-raw,format=S16LE,rate=44100,channels=2,depth=16") vol = New MediaControl(pl, "volume") vol["volume"] = 0.5 ' <1.0 = volume <100% | 1.0 = volume 100% | >1.0 = volume >100% enc = New MediaControl(pl, "wavenc") snk = New MediaControl(pl, "filesink") snk["location"] = "/tmp" &/ File.BaseName(filemidi) & ".wav" src.LinkTo(par) par.LinkTo(fdc) fdc.LinkTo(con) con.LinkTo(res) res.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)) While Not bo Write "\r\e[0mTempo di conversione: \e[31m" & Str(Time(0, 0, 0, pl.Position * 1000)) Wait 0.01 Wend pl.Stop 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 As String Dim pl As MediaPipeline Dim src, par, fdc, con, res, vol, vor, mux, snk As MediaControl filemidi = "/percorso/del/file.mid" pl = New MediaPipeline As "PLine" src = New MediaControl(pl, "filesrc") src["location"] = filemidi par = New MediaControl(pl, "midiparse") fdc = New MediaControl(pl, "fluiddec") con = New MediaControl(pl, "audioconvert") res = New MediaControl(pl, "audioresample") 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"] = "/tmp" &/ File.BaseName(filemidi) & ".ogg" 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)) While Not bo Write "\r\e[0mTempo conversione: \e[31m" & Str(Time(0, 0, 0, pl.Position * 1000)) Wait 0.01 Wend pl.Stop 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 questo terzo esempio si otterrà un file MP3 da un file MIDI:
Private bo As Boolean Public Sub Main() Dim filemidi As String Dim pl As MediaPipeline Dim src, par, fdc, con, res, vol, lam, snk As MediaControl filemidi = "/percorso/del/file.mid" pl = New MediaPipeline As "PLine" src = New MediaControl(pl, "filesrc") src["location"] = filemidi par = New MediaControl(pl, "midiparse") fdc = New MediaControl(pl, "fluiddec") con = New MediaControl(pl, "audioconvert") res = New MediaControl(pl, "audioresample") 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"] = "/tmp" &/ File.BaseName(filemidi) & ".mp3" 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)) While Not bo Write "\r\e[0mTempo conversione: \e[31m" & Str(Time(0, 0, 0, pl.Position * 1000)) Wait 0.01 Wend pl.Stop 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 questo quarto esempio si otterrà un file AAC da un file MIDI:
Private bo As Boolean Public Sub Main() Dim filemidi As String Dim pl As MediaPipeline Dim src, par, fdc, con, res, vol, faa, snk As MediaControl Dim flt1, flt2 As MediaFilter filemidi = "/percorso/del/file.mid" pl = New MediaPipeline As "PLine" src = New MediaControl(pl, "filesrc") src["location"] = filemidi par = New MediaControl(pl, "midiparse") fdc = New MediaControl(pl, "fluiddec") con = New MediaControl(pl, "audioconvert") res = New MediaControl(pl, "audioresample") flt1 = New MediaFilter(pl, "audio/x-raw,format=S16LE,rate=44100,channels=2,depth=16") vol = New MediaControl(pl, "volume") vol["volume"] = 1.0 ' <1.0 = volume <100% | 1.0 = volume 100% | >1.0 = volume >100% faa = New MediaControl(pl, "faac") flt2 = New MediaFilter(pl, "audio/mpeg,stream-format=adts,channels=2,rate=44100") snk = New MediaControl(pl, "filesink") snk["location"] = "/tmp" &/ File.BaseName(filemidi) & ".aac" src.LinkTo(par) par.LinkTo(fdc) fdc.LinkTo(con) con.LinkTo(res) res.LinkTo(flt1) flt1.LinkTo(vol) vol.LinkTo(faa) faa.LinkTo(flt2) flt2.LinkTo(snk) pl.Play() Print "Durata del file Midi: "; Str(Time(0, 0, 0, pl.Duration * 1000)) While Not bo Write "\r\e[0mTempo di conversione: \e[31m" & Str(Time(0, 0, 0, pl.Position * 1000)) Wait 0.01 Wend pl.Stop pl.Close Print "\n\e[0mConversione terminata !" End Public Sub PLine_End() ' Questo Evento viene sollevato, quando la conversione è terminata bo = True End