[gstreamer-bugs] [Bug 545433] New: support tempo tag in wav
GStreamer (bugzilla.gnome.org)
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Tue Jul 29 22:59:45 PDT 2008
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GStreamer | gst-plugins-good | Ver: HEAD CVS
Summary: support tempo tag in wav
Product: GStreamer
Version: HEAD CVS
Platform: Other
OS/Version: Linux
Status: UNCONFIRMED
Severity: normal
Priority: Normal
Component: gst-plugins-good
AssignedTo: gstreamer-bugs at lists.sourceforge.net
ReportedBy: ensonic at sonicpulse.de
QAContact: gstreamer-bugs at lists.sourceforge.net
GNOME version: Unspecified
GNOME milestone: Unspecified
** The acid chunk goes a little something like this:
**
** 4 bytes 'acid'
** 4 bytes (int) length of chunk starting at next byte
**
** 4 bytes (int) type of file:
** this appears to be a bit mask,however some combinations
** are probably impossible and/or qualified as "errors"
**
** 0x01 On: One Shot Off: Loop
** 0x02 On: Root note is Set Off: No root
** 0x04 On: Stretch is On, Off: Strech is OFF
** 0x08 On: Disk Based Off: Ram based
** 0x10 On: ?????????? Off: ????????? (Acidizer puts that ON)
**
** 2 bytes (short) root note
** if type 0x10 is OFF : [C,C#,(...),B] -> [0x30 to 0x3B]
** if type 0x10 is ON : [C,C#,(...),B] -> [0x3C to 0x47]
** (both types fit on same MIDI pitch albeit different octaves, so who
cares)
**
** 2 bytes (short) ??? always set to 0x8000
** 4 bytes (float) ??? seems to be always 0
** 4 bytes (int) number of beats
** 2 bytes (short) meter denominator //always 4 in SF/ACID
** 2 bytes (short) meter numerator //always 4 in SF/ACID
** //are we sure about the order?? usually its num/denom
** 4 bytes (float) tempo
**
>From wav.c in libsndfile library
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