flac dev - May 2010 - Updating metadata while encoding

Hi,

I am working on an application which records directly into a FLAC file. For this
purpose I'm using the FLAC stream encoder interface.

It works fine, but if my application is killed during encoding, the metadata is
not being updated since the file isn't closed properly by calling
FLAC__stream_encoder_finish().

Thus when opening the file afterwards for playback, it is possible to decode
audio data but the FLAC__StreamMetadata.data.stream_info.total_samples field is
equals to zero.

This is a true problem because it looks like data loss to the user, especially
if he/she's been recording for hours...

So I'm looking for a way to update the metadata periodically during
encoding,
before calling FLAC__stream_encoder_finish().

Is this possible?

Thanks in advance

--
  Olivier

On 05/28/2010 04:38 PM, Olivier Guilyardi wrote:
> Hi,
> 
> I am working on an application which records directly into a FLAC file. For
this
> purpose I'm using the FLAC stream encoder interface.
> 
> It works fine, but if my application is killed during encoding, the
metadata is
> not being updated since the file isn't closed properly by calling
> FLAC__stream_encoder_finish().
> 
> Thus when opening the file afterwards for playback, it is possible to
decode
> audio data but the FLAC__StreamMetadata.data.stream_info.total_samples
field is
> equals to zero.
> 
> This is a true problem because it looks like data loss to the user,
especially
> if he/she's been recording for hours...
> 
> So I'm looking for a way to update the metadata periodically during
encoding,
> before calling FLAC__stream_encoder_finish().
> 
> Is this possible?
For the records, I ended up with adding FLAC__stream_encoder_flush(), as shown
in the attached diff.

It's certainly not perfect, for instance it won't work for the OGG
container.

But it apparently works for me.

--
  Olivier
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