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<font face="Courier New">Brian,<br>
<br>
Thanks for your reply.<br>
</font><br>
<blockquote type="cite"
cite="mid:2CBE9FE9-B928-4845-82E8-5D233083A91F@audiobanshee.com">Yes.
There is a specific header with this information. Look for the
documentation of the FLAC format for reference, and then look
through the library for calls that might return this information.</blockquote>
<br>
OK, I'll see that later.<br>
<br>
<blockquote type="cite"
cite="mid:2CBE9FE9-B928-4845-82E8-5D233083A91F@audiobanshee.com">You
should not use the RIFF information. It is not part of the FLAC
specification. It is an optional enhancement to store information
that is only about the input WAV files. It will strictly be
missing from FLAC files that are recorded live, converted from
AIFF, and will even be missing when WAV is the source if the
option is not added.</blockquote>
<br>
I'm aware of that. It happens that my flac files (there are many of
them) have been converted from wav files and contain riff cues and
associated text that have been annotated, many years ago, according
to a research protocol. I need to retrieve that information
automatically. The encoding has been done preserving foreign
metadata and tests have shown the information is correctly kept. I
have a script that can retrieve the info from the wav file, so I
decode a dummy wav with very few samples and the whole metadata
stuff, but it would be better to retrieve that information directly
from the file. <br>
<br>
I've read the FLAC format and cannot find any mention to where are
the foreign metadata included in the stream. Is it possible that it
isn't actually documented yet?<br>
<br>
<blockquote type="cite"
cite="mid:2CBE9FE9-B928-4845-82E8-5D233083A91F@audiobanshee.com">Are
you seeing 3 bytes for 1 sample? ... or are you seeing 3 samples?
Also, I recall that the FLAC library returns 32-bit numbers, so
you have to convert these to 16-bit or 24-bit samples.</blockquote>
<br>
I think it returns exactly the sample type the original file
contained, otherwise I guess it wouldn't be a lossless compressor.<br>
<br>
However, I made a more careful test and with skip=0 until=1 and get
2 samples instead of 3. <br>
<br>
I confirm this in two different ways: <br>
1) From the RIFF DATA header the size of audio data is 4 bytes, and
my wav was originally encoded at 16 bit per sample<br>
2) I open it in Audacity and it shows 2 samples <br>
<br>
What confused me is that when I open the same file in Cool Edit 2000
(an ancient commercial audio editor) it displays 4 samples, I don't
quite understand why. The first 2 ones are the first two of the
original file, the 3rd and 4th are 0. But this anomalous behavior
corresponds to Cool Edit, not FLAC. (My first example was with
skip=1 until=1, so it should have yielded 1 sample but Cool Edit
showed two more samples, both 0, which made the 3 samples)<br>
<br>
Let's go back to the result: I have 2 samples. Since I had skipped 0
or no sample, I have the first two samples, so I guess the first one
is #0 and the second one is #1. But there is still a conflict with
the documentation, which says (I quote again):<br>
<br>
--until={#|[+|-]mm:ss.ss} Stop at the given sample number for each
input file. <u>The given sample number is not included in the
decoded output.</u><br>
<br>
From my sample case it would appear that the given sample number is
indeed included in the decoded output.<br>
<br>
If I'm correct, this wouldn't be exactly a bug but an error in the
documentation. <br>
<br>
Regards,<br>
<br>
Federico Miyara <br>
<br>
<br>
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