13 Dec
2005
13 Dec
'05
8:01 p.m.
Paulo Marcel Coelho Aragao wrote on Dec, 12:
I recently switched from OSS to ALSA and no sound
comes from streaming
audio. CD playing with xmms or cdplay works correctly. Streaming audio with
xmms or gxine produces no sound. I can see that the server was contacted and
the player is reproducing the stream, but only a hissing sound comes from
the loudspeakers. I ruled out mixer problems because CD playing produces
sound.
[...]
I'm more puzzled now: I traced aplay, which produces sound, and gxine, which
doesn't produce sound. aplay plays a wav file, and gxine a rtsp:// stream. I
can see that both open /dev/snd/pcmC0D0p, and repeatedly ioctl the file
descriptor returned by open. I presume that these ioctl send the sound to the
ALSA driver, because I didn't see any write against the file descriptor. The
trace from both programs have a similar structure, but gxine produces no sound
and aplay does. As I mentioned before, all mixer controls, but Master, are set
at maximum value.
It must be something really obvious that I'm missing through sheer ignorance
of the whole process. Could anybody shed some light on this ?
Thanks for bearing with me
Paulo