Differenze tra le versioni di "Ottenere un file audio da un file MIDI mediante il Componente gb.media"

Da Gambas-it.org - Wikipedia.
(Creata pagina con "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 p...")
 
 
(37 versioni intermedie di uno stesso utente non sono mostrate)
Riga 5: Riga 5:
 
* ''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.
+
Private bo As Boolean
−
  Library "libc:6"
+
 +
 +
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 = "<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>")
 +
  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["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>")
 +
  snk = New MediaControl(pl, "<FONT color=#B22222>filesink</font>")
 +
  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'''()  <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
 
   
 
   
−
  <FONT color=gray>' ''void exit (int __status)''
+
  End
−
' ''Terminate program execution with STATUS.''</font>
+
In questo quarto esempio si otterrà un file AAC da un file MIDI:
−
  Private Extern exit_C(i As Integer) As Integer Exec "exit"
+
  Private bo As Boolean
 
   
 
   
 
   
 
   
−
  '''Public''' Sub Main()
+
  Public Sub Main()
 
    
 
    
 +
  Dim filemidi As String
 
   Dim pl As MediaPipeline
 
   Dim pl As MediaPipeline
−
   Dim src, mprs, fdc, cnv, wenc, snk As MediaControl
+
   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()
 +
 +
  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
 
    
 
    
−
    pl = New MediaPipeline
+
End
−
   
+
 
−
    src = New MediaControl(pl, "<FONT color=#B22222>filesrc</font>")
+
 
−
    src["location"] = "<FONT color=gray>''/percorso/del/file.mid''</font>"  <FONT color=gray>' ''"location" è una proprietà del plugin "filesrc"''</font>
+
 
−
   
+
=Riferimenti=
−
    mprs = New MediaControl(pl, "<FONT color=#B22222>midiparse</font>")
+
* https://github.com/Xilinx/gstreamer/blob/master/docs/random/uraeus/gstreamer_and_midi.txt
−
    fdc = New MediaControl(pl, "<FONT color=#B22222>fluiddec</font>")
 
−
    cnv = New MediaControl(pl, "<FONT color=#B22222>audioconvert</font>")
 
−
    wenc = New MediaControl(pl, "<FONT color=#B22222>wavenc</font>")
 
−
    alsa = New MediaControl(pl, "<FONT color=#B22222>alsasink</font>")
 
−
   
 
−
    src.LinkTo(mprs)
 
−
    mprs.LinkTo(fcd)
 
−
    fcd.LinkTo(cnv)
 
−
    cnv.LinkTo(wenc)
 
−
    wenc.LinkTo(snk)
 
−
   
 
−
    pl.State = Media.Playing
 
−
    pl.Play()
 
−
   
 
−
    Sleep 1
 
−
   
 
−
    While pl.Duration > pl.Position
 
−
      Write #File.Out, "\rDurata: " & Date(0, 0, 0, 0, 0, 0, pl.Duration * 1000) &
 
−
                      "    Tempo trascorso: " & Date(0, 0, 0, 0, 0, 0, pl.Position * 1000)
 
−
    Wend
 
−
   
 
−
'''End'''
 

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


Riferimenti

Estratto da "https://www.gambas-it.org/wiki/index.php?title=Ottenere_un_file_audio_da_un_file_MIDI_mediante_il_Componente_gb.media&oldid=36296"