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---moq129962068635292f6e376d45afba9a7fb679b7016b

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 Hi experts.

 I have started my small project - mp3 database for radio.

 http://martini.pudele.com/radio/mp3_database/mp3_database.html

 How do i normalize by peak [not RMS] and trim silences in begin and

 end of WAV files ?

 Silences somewhere in middle of file i wanna leave untouched.

 I wanna in first step detect MAX sample in whole WAV file.

  For example we gotta MAX sample 10 000, then Apmliefier_coefficient

 will be 32 000/10 000 =3D 3,2 .

 In second step i wanna trim silences at begin and below -80 dB [or 2

 bit noise]

  For this in same file each sample multiple by Apmliefier_coefficient

 , and see - result is over  -80 dB or not.

 If not, then first N samples will not written in trimmed file, but

 first sample that is over  -80 dB [in any channel] ,

 and all further samples written in new file.

 Now we must just follow which sample  [in any channel] is  over  -80

 dB.

 After write is complete, we can just truncate after last sample that

 was  over  -80 dB, and write header.

 So far i have found SOX vanna reverse da file for end silence trim,

 and for each step produce tmp file.

   Is here C API , program, script, way to do so what without any

 temporary files ?

 I have written script for normalize, but what ir best way for

 normalize ?

 What about mp3 and ogg  automatic normalize and frames trim ?

 Tnx in advance

 Alf

 =3D=3D=3D=3D

 #!/bin/bash

 for i in *.wav; do

  val=3D${i%.wav}

  echo "** Check peak for $i **"

   ampl=3D`sox "$i" -t wav /dev/null stat -v 2>&1`

   waveaus=3D${i%.wav}.wave

   wert1=3D"1.1";  wert2=3D$ampl;

   wahr=3D$(echo  "$wert1 >  $wert2" | bc)

   if  [ $wahr =3D 1 ]; then

     echo "  $wert1 > $wert2 , Do Nuthin"

   else

     echo "  $wert1 <=3D $wert2 , Do process"

     echo "** Amplifying volume by  -=3D$ampl=3D-  to fake a normalize =20

 $val.wav  --  $waveaus"

     ampl2=3D$(echo $ampl*0.9995 | bc -l)

     echo "ampl2 =3D $ampl2"

     sox -v $ampl2  "$i"  -t wav  "$waveaus"

   fi

 echo ""

 done

  ----

---moq129962068635292f6e376d45afba9a7fb679b7016b

Content-Type: text/html; charset=UTF-8

Content-Transfer-Encoding: quoted-printable
Hi experts.I have started my small project - mp3 database for r=

adio.http://martini.pudele.com/radio/mp3_database/mp3_database.htmlHow do i normalize by peak [not RMS] and tr=

im silences in begin and end of WAV files ?Silences somewhere in midd=

le of file i wanna leave untouched.I wanna in first step detect MAX sample=

 in whole WAV file. For example we gotta MAX sample 10 000, then A=

pmliefier_coefficient will be 32 000/10 000 =3D 3,2 .In second step i wanna trim silences at begin and below -80 dB [or 2 bi=

t noise] For this in same file each sample multiple by Apmliefier_coefficient , =

and see - result is over  -80 dB or not.If not, then fi=

rst N samples will not written in trimmed file, but first sample that is ov=

er  -80 dB [in any channel] ,and all further samples written in new f=

ile.Now we must just follow which sample  [in any channel] is  over  =

-80 dB.After write is complete, we can just truncate after last sampl=

e that was  over  -80 dB, and write header.  So far i hav=

e found SOX vanna reverse da file for end silence trim, and for each step p=

roduce tmp file.  Is here C API , program, script, way to do so=

 what without any temporary files ? I have written script for n=

ormalize, but what ir best way for normalize ?What about mp3 and ogg&=

#160; automatic normalize and frames trim ?Tnx in advance=

Alf=3D=3D=3D=3D#!/bin/bashfor i in *.wa=

v; do val=3D${i%.wav} echo "** Check peak for $=

i **"  ampl=3D`sox "$i" -t wav /dev/null stat -v 2>&amp=

;1`  waveaus=3D${i%.wav}.wave  wert1=3D"1.1";&#=

160; wert2=3D$ampl;  wahr=3D$(echo  "$wert1 >  $wer=

t2" | bc)  if  [ $wahr =3D 1 ]; then  &#160=

; echo "  $wert1 > $wert2 , Do Nuthin"  else =

   echo "  $wert1 <=3D $wert2 , Do process" &#=

160;  echo "** Amplifying volume by  -=3D$ampl=3D-  to fake =

a normalize   $val.wav  --  $waveaus"  =

  ampl2=3D$(echo $ampl*0.9995 | bc -l)    echo "a=

mpl2 =3D $ampl2"    sox -v $ampl2  "$i"  -t =

wav  "$waveaus"  fiecho ""done   ----  

=0A

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