[Bug 676884] New: Wrong segment length for audiotestsrc
GStreamer (bugzilla.gnome.org)
bugzilla at gnome.org
Sat May 26 07:40:00 PDT 2012
https://bugzilla.gnome.org/show_bug.cgi?id=676884
GStreamer | gst-plugins-base | 0.10.36
Summary: Wrong segment length for audiotestsrc
Classification: Platform
Product: GStreamer
Version: 0.10.36
OS/Version: Linux
Status: UNCONFIRMED
Severity: normal
Priority: Normal
Component: gst-plugins-base
AssignedTo: gstreamer-bugs at lists.freedesktop.org
ReportedBy: ksb at kth.se
QAContact: gstreamer-bugs at lists.freedesktop.org
GNOME version: ---
Created an attachment (id=215047)
--> (https://bugzilla.gnome.org/attachment.cgi?id=215047)
Source for a program that writes a wav file of given length
The resulting segment length is incorrect when doing sample
(GST_FORMAT_DEFAULT) seek on audiotestsrc. The reason for this seems to be that
the sample index is first converted to nanoseconds (GST_FORMAT_TIME) and then
back to samples. Due to rounding errors this often produce one sample less than
intended.
I suggest using gst_util_uint64_scale_int_round instead of
gst_util_uint64_scale_int in gstaudiotestsrc.c when converting from time to
samples.
I've attached a test program that should produce a sine tone in
/tmp/segment.wav with the length as given by the command line argument.
In reality the resulting file is often one sample short.
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