[gst-devel] Playing RAW Audio after Resampling

[Sameer Naik]

Hi, 
I have created a test raw audio file with the parameters
audio/x-raw-int, width=16, depth=16, endianness=1234, signed=true, channels=2, 
rate=22050, using the following command

1] 
gst-launch filesrc location=audio.mp3 ! mad ! audioconvert ! audioresample ! 
audio/x-raw-int, width=16, depth=16, rate=22050, endianness=1234, 
signed=\(boolean\)true, channels=2 ! filesink location=sound.raw

Now if i try to play this raw audio file using the following pipeline (22050Hz 
resampled to 48000Hz),

2]
gst-launch filesrc location=sound.raw ! audio/x-raw-int, width=16, depth=16, 
rate=22050, endianness=1234, signed=\(boolean\)true, channels=2 ! 
audioresample !  audio/x-raw-int, width=16, depth=16, rate=48000, 
endianness=1234, signed=\(boolean\)true, channels=2 ! osssink

I hear no output whatsoever.
------
If i first resample the file to 48000Hz and store it on disk, using the command

3]
gst-launch filesrc location=sound.raw ! audio/x-raw-int, width=16, depth=16, 
rate=22050, endianness=1234, signed=\(boolean\)true, channels=2 ! 
audioresample !  audio/x-raw-int, width=16, depth=16, rate=48000, 
endianness=1234, signed=\(boolean\)true, channels=2 ! filesink 
location=resampled.raw

and then if i try to play this file, using the command

4]
gst-launch filesrc location=sound.raw ! audio/x-raw-int, width=16, depth=16, 
rate=48000, endianness=1234, signed=\(boolean\)true, channels=2 ! osssink

Then i get proper audio output. 

I am trying to figure out what is happening in case of pipeline 2, that audio 
is not playing. I am guessing the buffers need to be re-timestamped after the 
audioresample, is that the problem here? and if so is there a plugin that i 
can use to timestamp the buffers?

Regards
~Sameer