c# - Split audio file into pieces -

i´m trying split audio file in pieces.

the fact is: have byte array , split wav file random pieces (3 example).

of course, know can´t this. have idea on how it?

byte[] result = stream.toarray(); byte[] testing = new byte[44];  (int ix = 0; ix < testing.length; ix++) {     testing[ix] = result[ix]; }  system.io.file.writeallbytes("yourfilepath_" + system.guid.newguid() + ".wav", testing); 

i build solution in c# heard there lib called sox , can split silence gap this:

sox in.wav out.wav silence 1 0.5 1% 1 5.0 1% : newfile : restart 

but everytime run command, 1 file generated. (audio file lasts 5 seconds, , each splitted file must have aroung 1 second).

what best way this?

thank much!

edit

with sox:

string sox = @"c:\program files (x86)\sox-14-4-1\sox.exe"; string inputfile = @"d:\brothers vibe - rainforest.mp3"; string outputdirectory = @"d:\splittest"; string outputprefix = "split";  int[] segments = { 10, 15, 30 };  ienumerable<string> enumerable = segments.select(s => "trim 0 " + s.tostring(cultureinfo.invariantculture)); string @join = string.join(" : newfile : ", enumerable); string cmdline = string.format("\"{0}\" \"{1}%1n.wav" + "\" {2}", inputfile,     path.combine(outputdirectory, outputprefix), @join);  var processstartinfo = new processstartinfo(sox, cmdline); process start = system.diagnostics.process.start(processstartinfo); 

if sox complains libmad (for mp3) : copy dlls next it, see here

alternatively can use ffmpeg in same manner :

ffmpeg -ss 0 -t 30 -i "brothers vibe - rainforest.mp3" "brothers vibe - rainforest.wav" 

(see docs details)

---

you can bass.net :

for code below pass in :

• input file name
• desired duration each segment
• output directory
• prefix use each segment file

the method check whether file long enough specified segments, if yes cut file wavs same sample rate, channels, bit depth.

using system; using system.collections.generic; using system.io; using system.linq; using system.windows.forms; using un4seen.bass; using un4seen.bass.misc;  namespace windowsformsapplication2 {     public partial class form1 : form     {         public form1()         {             initializecomponent();         }          private void form1_load(object sender, eventargs e)         {             if (!bass.bass_init(-1, 44100, bassinit.bass_device_default, intptr.zero))                 throw new invalidoperationexception("couldn't initialize bass");              string filename = @"d:\brothers vibe - rainforest.mp3";             var segments = new double[] {30, 15, 20};             string[] splitaudio = splitaudio(filename, segments, "output", @"d:\split");         }          private static string[] splitaudio(string filename, double[] segments, string prefix, string outputdirectory)         {             if (filename == null) throw new argumentnullexception("filename");             if (segments == null) throw new argumentnullexception("segments");             if (prefix == null) throw new argumentnullexception("prefix");             if (outputdirectory == null) throw new argumentnullexception("outputdirectory");             int = bass.bass_streamcreatefile(filename, 0, 0,                 bassflag.bass_stream_prescan | bassflag.bass_stream_decode);             if (i == 0)                 throw new invalidoperationexception("couldn't create stream");              double sum = segments.sum();              long length = bass.bass_channelgetlength(i);             double seconds = bass.bass_channelbytes2seconds(i, length);             if (sum > seconds)                 throw new argumentoutofrangeexception("segments", "required segments exceed file duration");             bass_channelinfo info = bass.bass_channelgetinfo(i);              if (!directory.exists(outputdirectory)) directory.createdirectory(outputdirectory);              int index = 0;             var list = new list<string>();             foreach (double segment in segments)             {                 double d = segment;                 long seconds2bytes = bass.bass_channelseconds2bytes(i, d);                 var buffer = new byte[seconds2bytes];                 int getdata = bass.bass_channelgetdata(i, buffer, buffer.length);                 string name = string.format("{0}_{1}.wav", prefix, index);                 string combine = path.combine(outputdirectory, name);                 int bitspersample = info.is8bit ? 8 : info.is32bit ? 32 : 16;                 var wavewriter = new wavewriter(combine, info.chans, info.freq, bitspersample, true);                 wavewriter.writenoconvert(buffer, buffer.length);                 wavewriter.close();                 list.add(combine);                 index++;             }             bool free = bass.bass_streamfree(i);              return list.toarray();         }     } } 

todo

the extraction not optimized, if concerned memory usage, function should enhanced grab parts of segments , write them progressively wavewriter.

notes

bass.net has nag screen, can request free registration serial @ website.

note, install bass.net make sure copy bass.dll base package next exe. also, can use pretty audio formats, see website formats plugins , how load them (bass_pluginload).