Using GST_TAG_TRACK_NUMBER for selecting tracks / subsongs?

[Carlos Rafael Giani]

Oh, I did not know of the TOC_SELECT event! Interesting.

But, should I still use track_number/track_count to announce the current 
subsong and the number of subsongs? The latter seems redundant if 
there's a TOC, but would be consistent (= there would be track number & 
track count).

On 2016-05-16 11:05, Tim Müller wrote:
> On Mon, 2016-05-16 at 10:45 +0200, Carlos Rafael Giani wrote:
>
> Hi,
>
>> I was thinking of ways to allow application to select subsongs with
>> my
>> nonstream-audio plugins ( https://github.com/dv1/gst-nonstream-audio
>> ).
>> Then I stumbled upon GST_TAG_TRACK_NUMBER. Does it make sense to
>> inject
>> this into the pipeline and use that to select a "track" (= subsong)?
>> Or
>> is there a better way? I know of the TOC setter, but do not see how
>> this
>> would help with selecting the current subsong.
> GstTocSetter is for writing ToCs when writing files, I don't think it's
> what you need.
>
> I think you have two options:
>
> 1) you can register a new GstFormat called "track" and do a seek in
> track format then. This is similar to what we used to do before we had
> TOC support in GStreamer (for audio cds, dvd sources had title and
> chapter formats)
>
> 2) make your element advertise tracks/subsongs via GstToc. The
> application can then select the desired track/subsong by sending a
> TOC_SELECT event to the pipeline/your plugin:
>
>    gst_event_new_toc_select()
>
> I'd go for 2).
>
> Cheers
>   -Tim
>