cava

cava/config

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+## Configuration file for CAVA.
+# Remove the ; to change parameters.
+
+
+[general]
+
+# Smoothing mode. Can be 'normal', 'scientific' or 'waves'. DEPRECATED as of 0.6.0
+; mode = normal
+
+# Accepts only non-negative values.
+; framerate = 60
+
+# 'autosens' will attempt to decrease sensitivity if the bars peak. 1 = on, 0 = off
+# new as of 0.6.0 autosens of low values (dynamic range)
+# 'overshoot' allows bars to overshoot (in % of terminal height) without initiating autosens. DEPRECATED as of 0.6.0
+; autosens = 1
+; overshoot = 20
+
+# Manual sensitivity in %. If autosens is enabled, this will only be the initial value.
+# 200 means double height. Accepts only non-negative values.
+; sensitivity = 100
+
+# The number of bars (0-512). 0 sets it to auto (fill up console).
+# Bars' width and space between bars in number of characters.
+; bars = 0
+; bar_width = 2
+; bar_spacing = 1
+# bar_height is only used for output in "noritake" format
+; bar_height = 32
+
+# For SDL width and space between bars is in pixels, defaults are:
+; bar_width = 20
+; bar_spacing = 5
+
+# sdl_glsl have these default values, they are only used to calulate max number of bars.
+; bar_width = 1
+; bar_spacing = 0
+
+
+# Lower and higher cutoff frequencies for lowest and highest bars
+# the bandwidth of the visualizer.
+# Note: there is a minimum total bandwidth of 43Mhz x number of bars.
+# Cava will automatically increase the higher cutoff if a too low band is specified.
+; lower_cutoff_freq = 50
+; higher_cutoff_freq = 10000
+
+
+# Seconds with no input before cava goes to sleep mode. Cava will not perform FFT or drawing and
+# only check for input once per second. Cava will wake up once input is detected. 0 = disable.
+; sleep_timer = 0
+
+
+[input]
+
+# Audio capturing method. Possible methods are: 'pulse', 'alsa', 'fifo', 'sndio' or 'shmem'
+# Defaults to 'pulse', 'pipewire', 'alsa' or 'fifo', in that order, dependent on what support cava was built with.
+# On Mac it defaults to 'portaudio' or 'fifo'
+# On windows this is automatic and no input settings are needed.
+#
+# All input methods uses the same config variable 'source'
+# to define where it should get the audio.
+#
+# For pulseaudio and pipewire 'source' will be the source. Default: 'auto', which uses the monitor source of the default sink
+# (all pulseaudio sinks(outputs) have 'monitor' sources(inputs) associated with them).
+#
+# For piepwire 'source' will be the object name or object.serial of the device to capture from.
+# Both input and output devices are supported.
+#
+# For alsa 'source' will be the capture device.
+# For fifo 'source' will be the path to fifo-file.
+# For shmem 'source' will be /squeezelite-AA:BB:CC:DD:EE:FF where 'AA:BB:CC:DD:EE:FF' will be squeezelite's MAC address
+; method = pulse
+; source = auto
+
+; method = pipewire
+; source = auto
+
+; method = alsa
+; source = hw:Loopback,1
+
+; method = fifo
+; source = /tmp/mpd.fifo
+; sample_rate = 44100
+; sample_bits = 16
+
+; method = shmem
+; source = /squeezelite-AA:BB:CC:DD:EE:FF
+
+; method = portaudio
+; source = auto
+
+
+[output]
+
+# Output method. Can be 'ncurses', 'noncurses', 'raw', 'noritake', 'sdl'
+# or 'sdl_glsl'.
+# 'noncurses' uses a custom framebuffer technique and prints only changes
+# from frame to frame in the terminal. 'ncurses' is default if supported.
+#
+# 'raw' is an 8 or 16 bit (configurable via the 'bit_format' option) data
+# stream of the bar heights that can be used to send to other applications.
+# 'raw' defaults to 200 bars, which can be adjusted in the 'bars' option above.
+#
+# 'noritake' outputs a bitmap in the format expected by a Noritake VFD display
+#  in graphic mode. It only support the 3000 series graphical VFDs for now.
+#
+# 'sdl' uses the Simple DirectMedia Layer to render in a graphical context.
+# 'sdl_glsl' uses SDL to create an OpenGL context. Write your own shaders or
+# use one of the predefined ones.
+; method = ncurses
+
+# Orientation of the visualization. Can be 'bottom', 'top', 'left' or 'right'.
+# Default is 'bottom'. Other orientations are only supported on sdl and ncruses
+# output. Note: many fonts have weird glyphs for 'top' and 'right' characters,
+# which can make ncurses not look right.
+; orientation = bottom
+
+# Visual channels. Can be 'stereo' or 'mono'.
+# 'stereo' mirrors both channels with low frequencies in center.
+# 'mono' outputs left to right lowest to highest frequencies.
+# 'mono_option' set mono to either take input from 'left', 'right' or 'average'.
+# set 'reverse' to 1 to display frequencies the other way around.
+; channels = stereo
+; mono_option = average
+; reverse = 0
+
+# Raw output target. A fifo will be created if target does not exist.
+; raw_target = /dev/stdout
+
+# Raw data format. Can be 'binary' or 'ascii'.
+; data_format = binary
+
+# Binary bit format, can be '8bit' (0-255) or '16bit' (0-65530).
+; bit_format = 16bit
+
+# Ascii max value. In 'ascii' mode range will run from 0 to value specified here
+; ascii_max_range = 1000
+
+# Ascii delimiters. In ascii format each bar and frame is separated by a delimiters.
+# Use decimal value in ascii table (i.e. 59 = ';' and 10 = '\n' (line feed)).
+; bar_delimiter = 59
+; frame_delimiter = 10
+
+# sdl window size and position. -1,-1 is centered.
+; sdl_width = 1000
+; sdl_height = 500
+; sdl_x = -1
+; sdl_y= -1
+
+# set label on bars on the x-axis. Can be 'frequency' or 'none'. Default: 'none'
+# 'frequency' displays the lower cut off frequency of the bar above.
+# Only supported on ncurses and noncurses output.
+; xaxis = none
+
+# enable alacritty synchronized updates. 1 = on, 0 = off
+# removes flickering in alacritty terminal emulator.
+# defaults to off since the behaviour in other terminal emulators is unknown
+; alacritty_sync = 0
+
+# Shaders for sdl_glsl, located in $HOME/.config/cava/shaders
+; vertex_shader = pass_through.vert
+; fragment_shader = bar_spectrum.frag
+
+; for glsl output mode, keep rendering even if no audio
+; continuous_rendering = 0
+
+
+[color]
+
+gradient = 1
+
+gradient_color_1 = '#8bd5ca'
+gradient_color_2 = '#91d7e3'
+gradient_color_3 = '#7dc4e4'
+gradient_color_4 = '#8aadf4'
+gradient_color_5 = '#c6a0f6'
+gradient_color_6 = '#f5bde6'
+gradient_color_7 = '#ee99a0'
+gradient_color_8 = '#ed8796'
+
+
+[smoothing]
+
+# Percentage value for integral smoothing. Takes values from 0 - 100.
+# Higher values means smoother, but less precise. 0 to disable.
+# DEPRECATED as of 0.8.0, use noise_reduction instead
+; integral = 77
+
+# Disables or enables the so-called "Monstercat smoothing" with or without "waves". Set to 0 to disable.
+; monstercat = 0
+; waves = 0
+
+# Set gravity percentage for "drop off". Higher values means bars will drop faster.
+# Accepts only non-negative values. 50 means half gravity, 200 means double. Set to 0 to disable "drop off".
+# DEPRECATED as of 0.8.0, use noise_reduction instead
+; gravity = 100
+
+
+# In bar height, bars that would have been lower that this will not be drawn.
+# DEPRECATED as of 0.8.0
+; ignore = 0
+
+# Noise reduction, int 0 - 100. default 77
+# the raw visualization is very noisy, this factor adjusts the integral and gravity filters to keep the signal smooth
+# 100 will be very slow and smooth, 0 will be fast but noisy.
+; noise_reduction = 77
+
+
+[eq]
+
+# This one is tricky. You can have as much keys as you want.
+# Remember to uncomment more than one key! More keys = more precision.
+# Look at readme.md on github for further explanations and examples.
+; 1 = 1 # bass
+; 2 = 1
+; 3 = 1 # midtone
+; 4 = 1
+; 5 = 1 # treble

cava/shaders/bar_spectrum.frag

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+#version 330
+
+in vec2 fragCoord;
+out vec4 fragColor;
+
+// bar values. defaults to left channels first (low to high), then right (high to low).
+uniform float bars[512];
+
+uniform int bars_count;    // number of bars (left + right) (configurable)
+uniform int bar_width;    // bar width (configurable), not used here
+uniform int bar_spacing;    // space bewteen bars (configurable)
+
+uniform vec3 u_resolution; // window resolution
+
+//colors, configurable in cava config file (r,g,b) (0.0 - 1.0)
+uniform vec3 bg_color; // background color
+uniform vec3 fg_color; // foreground color
+
+uniform int gradient_count;
+uniform vec3 gradient_colors[8]; // gradient colors
+
+vec3 normalize_C(float y,vec3 col_1, vec3 col_2, float y_min, float y_max)
+{
+    //create color based on fraction of this color and next color
+    float yr = (y - y_min) / (y_max - y_min);
+    return col_1 * (1.0 - yr) + col_2 * yr;
+}
+
+void main()
+{
+    // find which bar to use based on where we are on the x axis
+    float x = u_resolution.x * fragCoord.x;
+    int bar = int(bars_count * fragCoord.x);
+
+    //calculate a bar size
+    float bar_size = u_resolution.x / bars_count;
+
+    //the y coordinate and bar values are the same
+    float y =  bars[bar];
+
+    // make sure there is a thin line at bottom
+    if (y * u_resolution.y < 1.0)
+    {
+      y = 1.0 / u_resolution.y;
+    }
+
+    //draw the bar up to current height
+    if (y > fragCoord.y)
+    {
+        //make some space between bars basen on settings
+        if (x > (bar + 1) * (bar_size) - bar_spacing)
+        {
+            fragColor = vec4(bg_color,1.0);
+        }
+        else
+        {
+            if (gradient_count == 0)
+            {
+                fragColor = vec4(fg_color,1.0);
+            }
+            else
+            {
+                //find which color in the configured gradient we are at
+                int color = int((gradient_count - 1) * fragCoord.y);
+
+                //find where on y this and next color is supposed to be
+                float y_min = color / (gradient_count - 1.0);
+                float y_max = (color + 1.0) / (gradient_count - 1.0);
+
+                //make color
+                fragColor = vec4(normalize_C(fragCoord.y, gradient_colors[color], gradient_colors[color + 1], y_min, y_max), 1.0);
+            }
+        }
+    }
+    else
+    {
+        fragColor = vec4(bg_color,1.0);
+    }
+}

cava/shaders/northern_lights.frag

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+#version 330
+
+in vec2 fragCoord;
+out vec4 fragColor;
+
+// bar values. defaults to left channels first (low to high), then right (high to low).
+uniform float bars[512];
+
+uniform int bars_count;    // number of bars (left + right) (configurable)
+
+uniform vec3 u_resolution; // window resolution, not used here
+
+//colors, configurable in cava config file
+uniform vec3 bg_color; // background color(r,g,b) (0.0 - 1.0), not used here
+uniform vec3 fg_color; // foreground color, not used here
+
+void main()
+{
+    // find which bar to use based on where we are on the x axis
+    int bar = int(bars_count * fragCoord.x);
+
+    float bar_y = 1.0 - abs((fragCoord.y - 0.5)) * 2.0;
+    float y = (bars[bar]) * bar_y;
+
+    float bar_x = (fragCoord.x - float(bar) / float(bars_count)) * bars_count;
+    float bar_r = 1.0 - abs((bar_x - 0.5)) * 2;
+
+    bar_r = bar_r * bar_r * 2;
+
+    // set color
+    fragColor.r = fg_color.x * y * bar_r;
+    fragColor.g = fg_color.y * y * bar_r;
+    fragColor.b = fg_color.z * y * bar_r;
+}

cava/shaders/pass_through.vert

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+#version 330
+
+
+// Input vertex data, different for all executions of this shader.
+layout(location = 0) in vec3 vertexPosition_modelspace;
+
+// Output data ; will be interpolated for each fragment.
+out vec2 fragCoord;
+
+void main()
+{
+    gl_Position =  vec4(vertexPosition_modelspace,1);
+    fragCoord  = (vertexPosition_modelspace.xy+vec2(1,1))/2.0;
+}