Takashi Iwai wrote:
At Thu, 18 May 2006 13:29:36 -0300,
Juan Carlos Castro y Castro wrote:
OK, this implements the "infile" parameter of pcm_file in a much cleaner
way. Note that the the below new members of snd_pcm_file_t are not used
now, but WILL be when I implement protection from fraction-of-frame reads:
size_t rbuf_size_bytes;
size_t rbuf_used_bytes;
char *rbuf;
Now, the whole reason of this shebang was so I can use the "infile" AND
convert rates in the process -- i.e., the app programs its microphone in
whatever rate/format it wants, and ALSA converts the sound from the
existing format to what the app needs.
The exact opposite of this already works for output -- I can force a
file to be written in the same format, no matter how the app configures
its sound output. For this, I use the .asoundrc that's also attached.
But it doesn't work for input. Can someone help me?
I guess it works if you point a real mic PCM device as slave but still
using infile?
It will ignore the microphone and read from the file instead. The
typical use, therefore, is with the null plugin as slave.
If you want to mix a file and a live input (say, for making a narration
with ambient music), I suppose there are ways to do that with dmix, am I
correct? (Hmmm, this could have a "loop" option)
My problem is different, it's rate & format conversion. I want to be
able to use an specific existing file as input even if the app programs
the "microphone" for a different rate/format. I'm almost certain there
is a way to do that with existing ALSA plugins (plug? dmix?) but I've
been unable to find it out on my own. :(
The patch looks almost OK. But please don't forget to add the
description of new parameter in the doxygen comment (in \section
pcm_plugins_file Plugin: File), too.
Also, please provide a changelog and a signed-off-by line, e.g.
The short summary in a line...
A detailed change log...
....
Signed-off-by: Foo Bar <foo@xxxxxxx>
Will do.
Cheers,
Juan
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