Sponsored Content
Top Forums Programming My first PERL incarnation... Audio Oscillograph Post 303038164 by wisecracker on Tuesday 27th of August 2019 10:30:26 AM
Old 08-27-2019
Hi all...

Modified greatly and now captures real bytes from '/dev/urandom' and displays the plots.
Removed system() function calls where possible, (compare with post #1).
Saves a 'config' file to the current directory and loads on program restart, it just saves the capture mode on quitting at the moment.
As this is just an exercise in me learning the basics of Perl then this will not go anywhere near as sophisticated as AudioScope[.sh].
It is also ONLY capturing 64 bytes and running at maximum speed of 1mS per division as this is just a personal learning exercise.
Commented out the RANDOM line for the vertical axis FTTB.
Code:
#!/usr/bin/perl

# #########################################################
# Audio Oscillograph, (uncalibrated AF Oscilloscope).
# NOTE: Many terminal escape codes are not supported, so workarounds ARE needed.
# Oscillograph.pl
#
# This is perl 5, version 18, subversion 2 (v5.18.2) built for darwin-thread-multi-2level
# (with 2 registered patches, see perl -V for more detail

# #########################################################
# Needed!
use warnings;
use strict;

# #########################################################
# Make sure a bare config file exists in the current directory.
unless(-e "Oscillograph.config")
{
    my $config='$capture_mode="DEMO";
1;
';
    open(my $config_file, '>', 'Oscillograph.config');
    print $config_file "$config";
    close($config_file);
}

# #########################################################
# Global variables...
my $blankline="                                                                                ";
my $horiz=9;
my $vert=9;
my $plot="";
my @hexdump_array=();
our $capture_mode="DEMO";

require 'Oscillograph.config';

# #########################################################
# Clear the screen and reset the terminal.
sub clrscn
{
    print "\x1B[0m\x1Bc\x1B[2J\x1B[H";
}

# #########################################################
# Basic command processing...
sub commands
{
    print "\x1B[23;1f\x1B[0m$blankline";
    print "\x1B[23;1f\x1B[0mEnter 'QUIT'<CR> to quit or <CR> to [Re-]Run:- ";
    my $command=<STDIN>;
    chomp $command;
    if ( $command eq 'QUIT' )
    {
        my $config='$capture_mode="'."$capture_mode".'";
1;
';
        open(my $config_file, '>', 'Oscillograph.config');
        print $config_file "$config";
        close($config_file);
        &clrscn();
        print "Saved Oscillograph.config and resetting the terminal to the default state.\n";
        exit(0);
    }
    if ( $command eq 'DEMO' )
    {
        $capture_mode='DEMO';
    }
    if ( $command eq 'DSP' )
    {
        $capture_mode='DSP';
    }
    if ( $command eq 'ALSA' )
    {
        $capture_mode='ALSA';
    }
    if ( $command eq 'QT' )
    {
        $capture_mode='QT';
        &QT_script();
        system("/bin/sh", "/tmp/QT.scpt");
    }
}

# #########################################################
# This generates a shell script that runs an applescript to access QuickTime Player.
sub QT_script
{
my $AppleScript='/usr/bin/osascript << AppleSampler
    tell application "QuickTime Player"
        activate
        set savePath to "Macintosh HD:tmp:Untitled.m4a"
        set recording to new audio recording
        set visible of front window to false
        delay 2
        start recording
        delay 2
        stop recording
        export document "Untitled" in file savePath using settings preset "Audio Only"
        close (every document whose name contains "Untitled") saving no
        tell application "System Events" to click menu item "Hide Export Progress" of menu "Window" of menu bar 1 of process "QuickTime Player"
        delay 1
        quit
    end tell
AppleSampler
';
open(my $QuickTime, '>', '/tmp/QT.scpt');
print $QuickTime "$AppleScript";
close($QuickTime);
}

# #########################################################
# Screen DISPLAY setup function. For a terminal size of 80 x 24.
sub display
{
    # Set foreground and background graticule colours and foreground and background other window colours.
    print "\x1B[H\x1B[0;36;44m       +-------+-------+-------+---[\x1B[1;37;44mDISPLAY\x1B[0;36;44m]---+-------+-------+--------+       
       |       |       |       |       +       |       |       |        | \x1B[0;31;44mMAX\x1B[0;36;44m   
       |       |       |       |       +       |       |       |        |       
       |       |       |       |       +       |       |       |        |       
       |       |       |       |       +       |       |       |        |       
   \x1B[0;31;44m+ve\x1B[0;36;44m +-------+-------+-------+-------+-------+-------+-------+--------+       
       |       |       |       |       +       |       |       |        |       
       |       |       |       |       +       |       |       |        |       
       |       |       |       |       +       |       |       |        |       
     \x1B[1;32;44m0\x1B[0;36;44m +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+--+ \x1B[1;32;44mREF\x1B[0;36;44m   
       |       |       |       |       +       |       |       |        |       
       |       |       |       |       +       |       |       |        |       
       |       |       |       |       +       |       |       |        |       
   \x1B[0;30;44m-ve\x1B[0;36;44m +-------+-------+-------+-------+-------+-------+-------+--------+       
       |       |       |       |       +       |       |       |        |       
       |       |       |       |       +       |       |       |        |       
       |       |       |       |       +       |       |       |        | \x1B[0;30;44mMIN\x1B[0;36;44m   
       +-------+-------+-----[\x1B[1;37;44mAUDIO  OSCILLOGRAPH\x1B[0;36;44m]-----+-------+--------+       \x1B[0m

Commands available: QUIT, DEMO, DSP, ALSA and QT.\n\n\n";
}

# #########################################################
# Capture methods, '/dev/urandom', '/dev/dsp', '/usr/bin/arecord' and 'QuickTime Player'.
sub capture
{
    # IMPORTANT! None are used yet and NOT tested inside Perl.
    if ("$capture_mode" eq 'DEMO')
    {
        # DEMO mode that requires no HW access.
        system("/bin/dd if=/dev/urandom of=/tmp/waveform.raw bs=1 count=64 > /dev/null 2>&1");
        sleep(1);
    }
    if ($capture_mode eq 'DSP')
    {
        # DSP mode for the likes of old Linux boxes and CygWin, (OSS or PulseAudio).
        system("/bin/dd if=/dev/dsp of=/tmp/waveform.raw bs=1 count=8000 > /dev/null 2>&1");
    }
    if ($capture_mode eq 'ALSA')
    {
        # ALSA mode for Linux boxes that have 'arecord'. !!! Not tested yet. !!!
        system("/usr/bin/arecord -d 1 -c 1 -f U8 -r 8000 -t raw /tmp/waveform.raw > /dev/null 2>&1");
    }
    if ($capture_mode eq 'QT')
    {
        # A crucifyingly SSLLOOWW mode for Apple, OSX Mojave.
        # Conversion to RAW file not done yet...
        system("/bin/sh", "/tmp/QT.scpt");
    }
    @hexdump_array=`/usr/bin/hexdump -v -e '1/1 "%u\n"' /tmp/waveform.raw`;
}

# #########################################################
# Plot the points in the terminal window.
sub plotter
{
    for($horiz=9; $horiz<=72; $horiz=$horiz+1)
    {
        # Simulate an 8 bit grab and divide by 16 to give 4 bit depth.
        # Add offset of 2 to allow for missing the top graticule line.
        # IMPORTATNT! Using the builtin random number generator at present for DEMO.
        # $vert=int(rand(255/16)+2);
        chomp(${hexdump_array[($horiz-9)]});
        $vert="${hexdump_array[($horiz-9)]}";
        $vert=int(($vert/16)+2);
        # invert the signal. I'll let you work out why...
        $vert=(19-$vert);
        $plot="\x1B["."$vert".";"."$horiz"."f\x1B[1;37;44m*";
        print "$plot";
    }
}

# #########################################################
# Initialisation and main loop.
&clrscn();
&display();
if ($capture_mode eq 'QT')
{
    # Initialise Quicktime Player when 'QT' is selected.
    &QT_script();
    system("/bin/sh", "/tmp/QT.scpt");
}

while(1)
{
    &capture();
    &display();
    &plotter();
    &commands();
}

Results before quitting:
Code:
       +-------+-------+-------+---[DISPLAY]---+-------+-------+--------+       
       |*      |  *    |       |    *  +       *     * |       |        | MAX   
       |   *   |      *| *     | *     +*      |       |       |*   * * |       
       |       | *     |       |       +       |       |       |        |       
       |       *    *  |       |  *    +       |       |     **|     *  |       
   +ve +-------+-------*--*-*--+-----*-+-------+--*----+-------+--------+       
       |       |     * |      *|       +       |      *|*      |       *|       
       |       |*      |       |       +       |       |       |   *    |       
       |       |   *   |       |*      +       |       |       |        |       
     0 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-*-**+-+-+-+-+-+-*-+-+-+-+-+-+--+ REF   
       |       |       |     * |       +     * |       *   *   |        |       
       |       |       |       |       +       |       |       | *      |       
       |      *|       |       *   *  **  *    |       |  *    |        |       
   -ve +--*-*--+-------+-------+-------+-------+----*--+----*--+--------+       
       |     * |       |   *   |       +       | *     |       |        |       
       | *     |       |       |       +      *|       |       *        |       
       |       |       |*      |       +       |*  *   |       |  *     | MIN   
       +-------+-------+-----[AUDIO  OSCILLOGRAPH]-----+-------+--------+       

Commands available: QUIT, DEMO, DSP, ALSA and QT.


 Enter 'QUIT'<CR> to quit or <CR> to [Re-]Run:-

All criticism welcome!
My first PERL incarnation...  Audio Oscillograph-perl_scopepng
These 2 Users Gave Thanks to wisecracker For This Post:
 

6 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Audio HELP Please!

I know about next to nothing, and I am trying to play an audio file on HP-UX 10.2 (743i) every time I try to use the ‘/opt/audio/bin/AudioCP &' command I get an error message that says “Unable to access audio hardware.” I checked the man page on audio, and both Aserver and rpcd are running. Am I... (4 Replies)
Discussion started by: Matt
4 Replies

2. UNIX for Dummies Questions & Answers

playing audio

Hi all, I play audio through the web browser and it plays ok on windows. When i try the same thing on unix i get the error message "sh: /usr/local/bin/sox: not found. I've tried 'locate sox' and can't seem to find it. Is there some way I can change the browser settings so they play the audio... (3 Replies)
Discussion started by: molli_81
3 Replies

3. UNIX for Advanced & Expert Users

Audio-Text in Unix

Hello all, Could anyone help to me :as to how can i record an audio file in unix and convert it into a text . Or anything with audio recording to get started would help . thanks, (3 Replies)
Discussion started by: phantom308
3 Replies

4. UNIX for Dummies Questions & Answers

Audio Problem

Hi I recently installed BT 5 Gnome on my Asus laptop running on Intel HD graphics. I've been having problems with audio, at first I experienced the basic problem that was solved by adding pulse audio to the starting programs. This allowed me to open Sound preferences but I still have no sound.... (0 Replies)
Discussion started by: edreeso
0 Replies

5. Slackware

Problems with audio recording in Audacity 2.0.5. Slackware64 14.1; Intel HD Audio.

I'm trying to record audio using Audacity 2.0.5 installed from SlackBuilds. My system is 64-bit Slackware 14.1 and a sound card is Intel HD Audio. I didn't change my sound system to OSS. (Default sound system in Slackware 14.1 is ALSA, isn't it?) First, I set Internal Microphone slider in KMix... (2 Replies)
Discussion started by: qzxcvbnm
2 Replies

6. OS X (Apple)

An Audio Function Generator...

Ok guys, gals and geeks... As from today I am starting to learn awk in earnest doing something totally different. I am going to create a pseudo-Audio_Function Generator centred around OSX 10.11.x minimum. The code below is a tester to see what the possibilities are. All waveforms will be... (11 Replies)
Discussion started by: wisecracker
11 Replies
All times are GMT -4. The time now is 04:07 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy