[LAU] sndfile-waveform PNG generator ?

[Joel Roth]

On Tue, Jan 10, 2012 at 09:32:08PM +0100, Robin Gareus wrote:
> On 01/10/2012 08:42 PM, Tim Orford wrote:
> > 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 <audio-file-name>
> Options:
>   -o <filename>  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 <font>      specify font for annotations
>   -t <fps>       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 :)

This will be awesome! IIUC, it sounds like just the sort of thing
I could glue into Nama for visualizing waveforms. 
 
(snip)

> greetings,
> robin

-- 
Joel Roth