linuxaudio.org

On 01/10/2012 08:42 PM, Tim Orford wrote:

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> On Tue, Jan 10, 2012 at 03:38:39PM +0100, Robin Gareus wrote:

>> [...]

>> It's also pretty straight-forward in C; but before whipping up

>> `sndfile-waveform`, I'd thought I ask around.

>

> Hi Robin

>

> I'm trying to wrap up a first release of 'libwaveform'

> which mostly outputs to opengl using textures or shader

> programs, but I could add a PNG output tomorrow if you

> are interested. What command line args do you need?

Hi Tim,

dreaming up --help:
Usage: snd2png

Options:

  -o   write PNG to file instead of STDOUT

  -w             width in pixels (default 800)

  -h             height in pixels (default 192)
maybe:

  -A             annotate axes with sample-number (X), value (Y).

                 add info-box: sample-rate, bit-format.

  -c             foreground color (RGBA) 0x000000ff (black)

  -C             background color (RGBA) 0xffffff80 (semi transp white)
maybe later:

  -l             log-scale

  -r             rectified waveform shape

  -F       specify font for annotations

  -t        use timecode instead of sample-numbers for x-axis

  -T             timecode start-offset - override BWF header info

  -M             add meta-data to annotations.

  -f             FFT analyze, colour highlight peak freq.
In general: keep it professional (scientific) and simple.
I've been thinking of throwing some time at forking sndfile-spectrogram

which already has all required infrastructure (and more). I don't think

a dedicated libwaveform is needed. It's pretty straight forward, isn't

it? I was actually surprised that there's actually no sndfile-waveform

tool, yet! -- Yeah right. It's a gimmick :)
> While I am posting to the list, I would like to improve

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> the antialiasing and shading;

AFAIK you can use cairo-surface as OpenGL-textures.
> does anyone have any

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> particularly good examples of waveform displays that

> could be used for inspiration? (could be movie screenshots,

> applications, whatever...)

Nope, none that you would not already know.

That reminds me: How are things going with SampleCat?
> Regards

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> --

> Tim Orford

greetings,

robin

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