On 23 October 2011 at 17:38, Fons Adriaensen <fons@xxxxxxxxxxxxxx> wrote: > On Sun, Oct 23, 2011 at 08:13:24AM -0700, Kevin Cosgrove wrote: > > > The subject line says it all. I'm looking for a Linux solution to > > watermarking audio. Thanks... > > I've never seen any. The amount of work to develop such a thing > would depend on your exact requirements. Important parameters > are: I never thought much about requirements, as I wasn't thinking of creating one. > * Which operations should leave the watermark intact. If this > includes lossy encoding/decoding things get more difficult. Maybe version 0.5 would work with lossless and version 2.X would work with lossy? > * The minium duration of a fragment that allows the mark to be > detected. However long is easiest I suppose. 1 sec? 10 sec? Repeated in spots through the file X times, where 1 < X < (length in minutes)? > * How strong the 'provability' should be. Maybe version 0.5 is 10% chance of proving, and version 2.X would be better? > * Operational requirements. For example, should it be possible > to verify the mark without having the information necessary > to remove it ? Some operations would be: - Mark - Un-mark - Re-mark - Remove - Verify signature - Verify content In a later version maybe the tool could be able to use some of the above tools, in cooperation with other sound file tools, to preserve a watermark across sound file format conversions, between lossless forms and crossing between lossy/lossless domains. For version 0.01 even just being able to attach an md5 sum of an audio file along with a gpg signature would be cool. I use a subset of GNUPG's capability. Maybe you can see that in my above requirements? ;-) Is that a useful start on a start? Thanks.... -- Kevin _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
