scripts/SplitAudioUsingSileroLog.pl

$silerolog=$ARGV[0]; 
$srcdir=$ARGV[1];
$dstdir=$ARGV[2];
$suff=""; 
$audioprocessing=1; # 0 to process quickly all json file to find warnings

if(! -d $dstdir){ mkdir $dstdir; }

# counters
$segmentstot=0;
$segmentstransferred=0;
$durationtot=0.0;
$durationtransferred=0.0;

$audiofilestot=0;
$audiofilesexisting=0;
$audiofilesmissing=0;
$audiofilessaved=0;
$audiofilesduplicated=0;

$lastaudioid="";
$offsetread=0.0; # number of seconds read (excluding 44 bytes header)
$openedfile=0; # flag, 1 if there are a pair of files (read, write) open

%processedaudiofiles=(); # to avoid reprocessing the same file twice in case of dirty logs

if($silerolog=~m/.gz/){
    open (SL, "zcat $silerolog|") || die "cannot read (using zcat) Silero log file $silerolog";
}
else{
    open (SL, "<$silerolog") || die "cannot read Silero log file $silerolog";
}
while($line=<SL>){
    $line=~s/\r?\n//;
    ($aid,$off,$dur)=("","","");
    #  {"audio_id": "c_BdUr5patI", "offset": 0.802, "duration": 10.46}
    if($line=~m/^\{\"audio_id\": \"([^\"]+)\", \"offset\": ([0-9\.]+), \"duration\": ([0-9\.]+)\}\s*$/){
	($aid,$off,$dur)=($1,$2,$3);
	# print "1 aid: <$aid> off: <$off> dur: <$dur>\n";
    }
    elsif($line=~m/\{\"audio_id\": \"([^\"]+)\", \"offset\": ([0-9\.]+), \"duration\": ([0-9\.]+)\}\s*$/){
	($aid,$off,$dur)=($1,$2,$3);
	print "WARNING: something strange <$line>\nWARNING: extracted parameters $aid , $off , $dur\n";
    }
    #print "read aid: <$aid> off: <$off> dur: <$dur>\n";
    
    if($aid=~m/\S/){
	if($aid eq $lastaudioid){ # new segment, old file
	    if($openedfile){
		# check if the segments are in the correct order
		if($off>=$offsetread){
		    $sil=($off-$offsetread);
		    $samplestoread=int($sil*1000)*16*2; # 2 bytes each sample
		    #printf "samplestoread %d %.3f \n",$samplestoread, $sil;
		    if($samplestoread > 0){
			if($audioprocessing){
			    $n=read AIN,$silence,$samplestoread;
			    unless($n == $samplestoread){
				print "WARNING: cannot fully read silence, <$n> read instead of <$samplestoread> from audio file $srcdir/$aid.wav\n";
				$localwarning++;
				$localerrors++ if($n == 0);
			    }
			    # print AOUT $silence; # if I print everything, I got the same file unless final tail
			}
			$offsetread+=$sil; # seconds read (excluding 44 bytes header)
			$segmentstot++;
			$durationtot+=$sil;
			$localsegmentstot++;
			$localdurationtot+=$sil;
		    }
		}
		else{
		    printf "WARNING: offsetread $offsetread greater than off $off from audio file $srcdir/$aid.wav\n";
		    $localwarning++;
		}
		$samplestoread=int($dur*1000)*16*2; # 2 bytes each sample
		#printf "samplestoread %d %.3f \n",$samplestoread, $dur;
		if($samplestoread > 0){
		    if($audioprocessing){
			$speech="";
			$n=read AIN,$speech,$samplestoread;
			unless($n == $samplestoread){
			    printf "WARNING: cannot fully read speech, <$n> read instead of <$samplestoread> from audio file $srcdir/$aid.wav\n";
			    $localwarning++;
			    $localerrors++ if($n == 0);
			}
			print AOUT $speech;
		    }
		    $localsegmentstot++;
		    $localsegmentstransferred++;
		    $localdurationtot+=$dur;
		    $localdurationtransferred+=$dur;
		    $segmentstot++;
		    $segmentstransferred++;
		    $durationtot+=$dur;
		    $durationtransferred+=$dur;
		    $offsetread+=$dur; # seconds read (excluding 44 bytes header)
		}
	    }
	    # for each segment:
	    #  - reads file_id, offset and duration;
	    #  - checks if the original audio file (.wav) is present in $srcdir/
	    #  - if yes, writes a new audio file with the same name (+suffix $suff) in $dstdir/
	    #  - appends the audio samples of the segment to the new audio file
	    #checks
	}
	else{ # new segment, new file
	    $audiofilestot++;
	    if($openedfile){	    # first closes old file, if any
		if($audioprocessing){
		    close(AIN);
		    close(AOUT);
		    if($localerrors <= 0 && $localwarning <= 1){
			system("sox -r 16000 -b 16 -c1 -e signed-integer $openfile.raw $openfile.wav");
			$audiofilessaved++;
		    }
		    else{
			printf("WARNING: REPORT file %s NOT SAVED: %d warning %d errors\n",$openfile,$localwarning,$localerrors);
		    }
		    unlink "$openfile.raw";
		}
		printf("REPORT file %s processed; %d segments from %d tot; %.1f seconds from %.1f seconds tot; %d warning %d errors\n",
		       $openfile,$localsegmentstransferred,$localsegmentstot,$localdurationtransferred,$localdurationtot,$localwarning,$localerrors);
		$openedfile=0;
		#exit(1); # stops after the first audio file

		# if($audiofilesexisting>2){ goto end; } # se >0 elabora un solo file
	    }

	    $localsegmentstot=0;
	    $localsegmentstransferred=0;
	    $localdurationtot=0.0;
	    $localdurationtransferred=0.0;
	    $localwarning=0;
	    $localerrors=0;
	    $offsetread=0.0; # number of samples read (excluding 44 bytes header )

	    if(defined($processedaudiofiles{$aid})){ # to avoid reprocessing the same file twice
		printf "WARNING: REPORT file $aid already processed, skipping\n";
		$audiofilesduplicated++;
	    }
	    elsif (-f "$srcdir/$aid.wav"){
		if($audioprocessing){
		    open(AIN,  "<$srcdir/$aid.wav") || die "cannot read audio file $srcdir/$aid.wav";
		    open(AOUT, ">$dstdir/${aid}$suff.raw") || die "cannot write audio file $dstdir/${aid}$suff.raw";
		}
		$audiofilesexisting++;
		$processedaudiofiles{$aid}=1; # to avoid reprocessing the same file twice
		$openfile="$dstdir/${aid}$suff";
		$openedfile=1;
		$offsetread=0.0; # number of samples read (excluding 44 bytes header)
		if($audioprocessing){
		    $n=read AIN,$header,44;
		    ($n == 44) || die "cannot read header <$n> from audio file $srcdir/$aid.wav";
		}
		$samplestoread=int($off*1000)*16*2; # 2 bytes each sample
		# printf "samplestoread %d %.3f \n",$samplestoread, $off;
		if($samplestoread > 0){
		    if($audioprocessing){
			$n=read AIN,$silence,$samplestoread;
			unless($n == $samplestoread){
			    printf "WARNING: cannot fully read silence, <$n> read instead of <$samplestoread> from audio file $srcdir/$aid.wav\n";
			    $localwarning++;
			    $localerrors++ if($n == 0);
			}
			# print AOUT $header; # if I print everything, I got the same file unless final tail
			# print AOUT $silence; # if I print everything, I got the same file unless final tail
		    }
		    $offsetread+=$off; # seconds read (excluding 44 bytes header)
		    $segmentstot++;
		    $durationtot+=$off;
		    $localsegmentstot++;
		    $localdurationtot+=$off;
		}
		$samplestoread=int($dur*1000)*16*2; # 2 bytes each sample	
		# printf "samplestoread %d %.3f \n",$samplestoread, $dur;
		if($samplestoread > 0){
		    if($audioprocessing){
			$speech="";
			$n=read AIN,$speech,$samplestoread;
			unless($n == $samplestoread){
			    printf "WARNING: cannot fully read speech, <$n> read instead of <$samplestoread> from audio file $srcdir/$aid.wav\n";
			    $localwarning++;
			    $localerrors++ if($n == 0);
			}
			print AOUT $speech;
		    }
		    $localsegmentstot++;
		    $localsegmentstransferred++;
		    $localdurationtot+=$dur;
		    $localdurationtransferred+=$dur;
		    $segmentstot++;
		    $segmentstransferred++;
		    $durationtot+=$dur;
		    $durationtransferred+=$dur;
		    $offsetread+=$dur; # seconds read (excluding 44 bytes header)
		}

		# read and discard silence, if > 0
		# read and write speech, if >0

	    }
	    else{
		$audiofilesmissing++;
		print "WARNING: REPORT audio file $srcdir/$aid.wav missing\n";
	    }
	    #  checks if the actual file was already processed
	    # open
	}
	$lastaudioid=$aid;
    }
    else{
	print "WARNING: REPORT cannot parse <$line> - aid: <$aid> off: <$off> dur: <$dur>\n";
	$localwarning++;
    }
}
 end:
    close (SL);

if($openedfile){	    # ends process last file, if any
    if($audioprocessing){
	close(AIN);
	close(AOUT);
	if($localerrors <= 0 && $localwarning <= 1){
	    system("sox -r 16000 -b 16 -c1 -e signed-integer $openfile.raw $openfile.wav");
	    $audiofilessaved++;
	}
	else{
	    printf("WARNING: REPORT file %s NOT SAVED: %d warning %d errors\n",$openfile,$localwarning,$localerrors);
	}
	unlink "$openfile.raw";
    }
    printf("REPORT file %s processed; %d segments from %d tot; %.1f seconds from %.1f seconds tot; %d warning %d errors\n",
	   $openfile,$localsegmentstransferred,$localsegmentstot,$localdurationtransferred,$localdurationtot,$localwarning,$localerrors);
}

$durationtransferredh=int($durationtransferred/36)/100;
$durationtoth=int($durationtot/36)/100;

print
    "REPORT segmentstot:           $segmentstot\n".
    "REPORT segmentstransferred:   $segmentstransferred\n".
    "REPORT durationtot:           $durationtot ($durationtoth hours)\n".
    "REPORT durationtransferred:   $durationtransferred ($durationtransferredh hours)\n".
    "REPORT audiofilestot:         $audiofilestot\n".
    "REPORT audiofilesexisting:    $audiofilesexisting\n".
    "REPORT audiofilessaved:       $audiofilessaved\n".
    "REPORT audiofilesmissing:     $audiofilesmissing\n".
    "REPORT audiofilesduplicated:  $audiofilesduplicated\n";


exit(1);