No sound after 1 second after AAC decode to usb sound card, but output to file seems OK

[Diaz Soho]

Hi All,


After checking the pipe when I use pipe 2 to verification.
2. gst-launch-0.10 -v
http://192.168.1.3:9000/disk/DLNA-PNAAC_ISO-OP01-FLAGS01700000/O0$1$8I2829.m4a
!
qtdemux ! ffdec_aac ! audioconvert ! audio/x-raw-int,width=16 ! alsasink

in the c code :gst-plugins-base-0.10.36/gst-libs/gst/audio/gstaudiosink.c,
function audioringbuffer_thread_func(),
the thread will read audio data from ring buffer, then write to audio sink.
I write the data  that read from ring buffer to local usb disk.
And check the file, it contents silence data after 1 second.

Does anyone have idea :
why audioringbuffer_thread_func() call
function gst_ring_buffer_prepare_read() , then get silence audio data?



Any input is very appreciate!!!!


Best Regards,
Soho





2013/12/4 Diaz Soho <soho123.2012 at gmail.com>

> Hi all,
>
> the pipe I used for verification:
> 1. gst-launch-0.10 -v
> http://192.168.1.3:9000/disk/DLNA-PNAAC_ISO-OP01-FLAGS01700000/O0$1$8I2829.m4a! qtdemux ! ffdec_aac ! audioconvert ! audio/x-raw-int,width=16 ! filesink
> location=/var/tmp/usb/sda1/aac_test.pcm
>
> 2. gst-launch-0.10 -v
> http://192.168.1.3:9000/disk/DLNA-PNAAC_ISO-OP01-FLAGS01700000/O0$1$8I2829.m4a! qtdemux ! ffdec_aac ! audioconvert ! audio/x-raw-int,width=16 ! alsasink
>
>
>
> In the pipe 1 , the output file /var/tmp/usb/sda1/aac_test.pcm can be
> played normally.
> In the pipe 2, the output from usb sound card can not be hear normally
> after about 1 seconds.
>
> Does anyone have any idea about the issue?
>
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