Play sound Post: 302787065

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Top Forums Shell Programming and Scripting Play sound Post 302787065 by wisecracker on Thursday 28th of March 2013 03:44:39 PM

03-28-2013

Registered User

Hi sreejithalokkan...

Makes much more sense now... ;o)

I will assume that you will need a a dedicated shell Audio I/O app for platform independence.
So I will suggest SOX...

I have to assume also that this is some _homework_ style project, but not necessarily so.

OK.

Think of your problem...

Keep it simple...

I am not going to give you the code directly as you learn nothing about what is going on...

Code:

1) Generate a function, let us call it "say_it()"
2) inside the function call SOX somehow to play your *.wav file. Something like this:-

say_it()
{
        /full/absolute/path/to/sox <your player options> somefile.wav
}

3) Use if - then - fi to call it something like this:-

number="one"
if [ "$number" == "one" ]
then
        # Your new function...
        say_it
fi

All "case"s can be catered for this way and this is its simplest and easiest to understand form, albeit slow...

Next try and make the function universal by making "somefile.wav" a variable...

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LEARN ABOUT PLAN9

mixer

MIXER(1)						  The Canonical Csound Reference						  MIXER(1)

NAME

       mixer - Mixes together a number of soundfiles. .

DESCRIPTION

       Mixes together a number of soundfiles, starting at different times and with individual channel selection from the input files.

SYNTAX

	   mixer [OPTIONS ... ] infile [[OPTIONS... ] infile] ...

INITIALIZATION

       Flags:

       o   -A = Generate an AIFF output file.

       o   -W = Generate an WAV output file.

       o   -h = Generate an output file with no header.

       o   -c = Generate 8-bit signed_char sound samples.

       o   -a = Generate alaw sound samples.

       o   -u = Generate ulaw sound samples.

       o   -s = Generate short integer sound samples.

       o   -l = Generate long (32 bit) integer sound samples.

       o   -f = Generate floating point samples.

       o   -F arg = Specifies the gain to be applied to the following input file. If arg is a floating point number that gain is applied uniformly
	   to the input. Alternatively it could be a file name which specifies a breakpoint file for varying the gain for different periods.

       o   -S integer = Indicate at which sample to start to mix in the next input file.

       o   -T fpnum = Indicate at which time (in seconds) to start to mix in the next input file.

       o   -1 = Mix in channel 1 from next sound file.

       o   -2 = Mix in channel 2 from next sound file.

       o   -3 = Mix in channel 3 from next sound file.

       o   -4 = Mix in channel 4 from next sound file.

       o   -^ intx inty = Mix in channel x from next sound file as channel y in the output.

       o   -v = Verbose mode.

       o   -R = Continually rewrite the header while writing soundfile (WAV/AIFF).

       o   -H integer = Show a "heart-beat" to indicate progress, in style 1, 2 or 3.

       o   -N = Alert call (usually ringing the bell) when finished.

       o   -o fname = output file name (default: test.wav)

EXAMPLES

       The default values are

	       mixer -s -otest -F 1.0 -S 0

       For example

	       mixer -F 0.96 in1.wav -S 300 -2 in2.aiff -S 300 -^4 1 in3.wav -o out.wav

       This creates a new sound file with a constant gain of 0.96 from in1.wav with the second channel of in2.aiff mixed in after 300 samples and
       channel 4 of in3.wav outpout as channel 1 after 300 samples.

CREDITS

       Author: John ffitch

       1994

AUTHORS

       Barry Vercoe
       MIT Media Lab

	   Author.

       Dan Ellis
       MIT Media Lab,
		 Cambridge
		 Massachussetts

	   Author.

COPYRIGHT

5.10								    08/01/2011								  MIXER(1)