[vorbis-dev] two questions re vorbisfile API
Thomas Vander Stichele
thomas at urgent.rug.ac.be
Mon Oct 28 09:14:07 PST 2002
currently wrapping my head around the vorbisfile API. The stream callback
interface is really nice ! Great work.
I'm running into two snags using it though.
a) getting ov_bitrate on a seakable stream returns a long.
When I print it as %ld, I get
Bitstream is 2 channel, 44100 Hz, 0 version, -2147483648 bitrate
I get this same number for any vorbis file.
I checked them with ogginfo, and that reports the right ABR.
Am I missing something ?
Calculating it manually by dividing total bits through total time gives
me a near-accurate value :
abr: 194184 bits/sec
ogginfo reports, for this file:
Nominal bitrate: 192.000000 kb/s
Upper bitrate not set
Lower bitrate not set
User comments section follows...
ALBUM=The Remote Part
TITLE=You Held The World In Your Arms
Vorbis stream 1:
Total data length: 4875041 bytes
Playback length: 3m:21s
Average bitrate: 193.160180 kbps
Logical stream 1 ended
Why is there a slight difference between the two values ?
ov_bitrate interprets "link == -1" as "the entire bitstream"
ov_comment interprets "link == -1" as "the current bitstream"
why the different behaviour ? Is there a reason behind this ?
c) am i correct in assuming that each logical bitstream in the phyiscal
one can contain at most one COMMENT tag ?
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