This doesn't look entirely right to me:

$ gst-launch-0.10 alsasrc ! fakesink -v
Setting pipeline to PAUSED ...
/GstPipeline:pipeline0/GstAlsaSrc:alsasrc0: actual-buffer-time = 170521
/GstPipeline:pipeline0/GstAlsaSrc:alsasrc0: actual-latency-time = 21315
... (width/depth=32,44100Hz,2ch) ..
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstAudioSrcClock
...
... 7520 bytes, timestamp: 0:00:00.000000000, duration: 0:00:00.021315192, offset: 0, offset_end: 940
... 7520 bytes, timestamp: 0:00:00.000000000, duration: 0:00:00.021315193, offset: 940, offset_end: 1880
... 7520 bytes, timestamp: 0:00:00.000000000, duration: 0:00:00.021315193, offset: 1880, offset_end: 2820
... 7520 bytes, timestamp: 0:00:00.000000000, duration: 0:00:00.021315192, offset: 2820, offset_end: 3760
... 7520 bytes, timestamp: 0:00:00.000000000, duration: 0:00:00.021315193, offset: 3760, offset_end: 4700
... 7520 bytes, timestamp: 0:00:00.000000000, duration: 0:00:00.021315193, offset: 4700, offset_end: 5640
... 7520 bytes, timestamp: 0:00:00.000000000, duration: 0:00:00.021315193, offset: 5640, offset_end: 6580
... 7520 bytes, timestamp: 0:00:00.000000000, duration: 0:00:00.021315192, offset: 6580, offset_end: 7520
... 7520 bytes, timestamp: 0:00:00.000000000, duration: 0:00:00.021315193, offset: 7520, offset_end: 8460
... 7520 bytes, timestamp: 0:00:00.021179138, duration: 0:00:00.021315193, offset: 8460, offset_end: 9400
... 7520 bytes, timestamp: 0:00:00.042494331, duration: 0:00:00.021315193, offset: 9400, offset_end: 10340
... 7520 bytes, timestamp: 0:00:00.063809524, duration: 0:00:00.021315192, offset: 10340, offset_end: 11280
... 7520 bytes, timestamp: 0:00:00.085124716, duration: 0:00:00.021315193, offset: 11280, offset_end: 12220
... 7520 bytes, timestamp: 0:00:00.106439909, duration: 0:00:00.021315193, offset: 12220, offset_end: 13160