ALSA Problem Solving on Jessie

alsacommands

lsusb
lsusb -v -d  1b3f:2007 | grep tSamFreq

cat /proc/asound/cards
cat /proc/asound/modules
cat ~/.asoundrc
cat /etc/asound.conf

alsamixer -c 0 
alsamixer -c 1
amixer -c 0
amixer -c 1

arecord -L
arecord -l
aplay -L
aplay -l

##Use below python code to find index of Device
>> python
po = pyaudio.PyAudio()
for index in range(po.get_device_count()):
    desc = po.get_device_info_by_index(index)
    print "device_name index  rate", desc["name"], index,  int(desc["defaultSampleRate"])
    
##Sample Rate Convertion in ~/.asoundrc
pcm.record {
    type plug;
    slave {
        pcm "hw:0,0"
    }
}

##changes in /usr/share/alsa/alsa.conf

defaults.ctl.card 0
defaults.pcm.card 0
# load card-specific configuration files (on request)

##Change To

defaults.ctl.card 1
defaults.pcm.card 1
load card-specific configuration files (on request)

##Better do experiments with Record script available on PyAudio Website
https://people.csail.mit.edu/hubert/pyaudio/

##From Documentation & Examples section, take the code of Record example, 
##modified it little bit as follows and then see if it works for you.

"""PyAudio example: Record a few seconds of audio and save to a WAVE file."""
CHUNK = 1024
FORMAT = pyaudio.paInt16
CHANNELS = 1
RATE = 16000
RECORD_SECONDS = 5
WAVE_OUTPUT_FILENAME = "output.wav"

p = pyaudio.PyAudio()
stream = p.open(format=FORMAT,
                channels=CHANNELS,
                rate=RATE,
                input_device_index = 1, # change 1 with pcm.record plugin index
                input=True,
                frames_per_buffer=CHUNK)


##Find out the index of pcm.record plugin and set that in
input_device_index