File writer plugin bug

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Hey list,

The bugtracker for ALSA appears to be down at the time of writing, so
I'll make note of this issue here.

The file writer output plugin appears to have a bug in it.

        $ cat /dev/zero | aplay -D "file:'../foo.raw',raw" -c8 -fs16_le -r192000
        Playing raw data 'stdin' : Signed 16 bit Little Endian, Rate 192000 Hz, Channels 8
        ALSA lib pcm_file.c:358:(snd_pcm_file_write_bytes) write failed: Bad file descriptor
        ALSA lib pcm_file.c:358:(snd_pcm_file_write_bytes) write failed: Bad file descriptor
        ALSA lib pcm_file.c:358:(snd_pcm_file_write_bytes) write failed: Bad file descriptor
        ALSA lib pcm_file.c:358:(snd_pcm_file_write_bytes) write failed: Bad file descriptor
        aplay: pcm_file.c:397: snd_pcm_file_add_frames: Assertion `file->wbuf_used_bytes < file->wbuf_size_bytes' failed.
        Aborted by signal Aborted...

I'm assuming this is a problem with the relative path usage. 

For now, if used from autoconf, one might be able to get around this
with $top_srcdir as a workaround as I am.

-- 
Kip Warner -- Senior Software Engineer
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http://www.thevertigo.com

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