Float not supported by alsasink

Sebastian Dröge sebastian at centricular.com
Tue May 16 11:48:20 UTC 2017

On Tue, 2017-05-16 at 03:41 -0700, vijaypalaniswamy wrote:
> Hi All,
> I tried playing ogg file, using vorbis decoder which gives PCM in float.
> Even the alsa device supports FLOAT pcm, the pipeline is not working without
> audioconvert [Required for format conversion from float to int]
> gst-launch-1.0 filesrc location=xxxx.ogg ! decodebin ! audioconvert ! 
> alsasink device=xxx
> By debugging I found in gst-plugins-base-1.8.3/ext/alsa/gstalsa.c function
> "gst_alsa_get_pcm_format"
> the float format is not added.
> So I compiled base plugin by adding below code 
> [...]
> With above change I am able to play float PCM.
> Any reason why FLOAT was not considered in base alsa? Is it expected not to
> have float support.
> Please let me know any method to avoid using audioconvert.

It seems to be just a case of it not being added yet. Please file a bug
with your patch and we can discuss/merge that:

Sebastian Dröge, Centricular Ltd · http://www.centricular.com
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