Using the following works fine
gst-launch-0.10 filesrc location=temp.wav ! wavparse ! audioconvert ! alsasink device=hw:0
as does
gst-launch-1.0 filesrc location=temp.wav ! wavparse ! audioconvert ! alsasink device=hw:0
When I use hw:2, I get a device is busy error if a player is using it and an Internal data flow error otherwise.
If I enable debugging
GST_DEBUG=2
I get the following
alsa pcm_hw.c:1693:_snd_pcm_hw_open: alsalib error: Invalid value for card
basetransform gstbasetransform.c:1414:gst_base_transform_setcaps:<audioconvert0> transform could not transform audio/x-raw, format=(string)S16LE, layout=(string)interleaved, channels=(int)2, channel-mask=(bitmask)0x0000000000000003, rate=(int)44100 in anything we support
basetransform gstbasetransform.c:1414:gst_base_transform_setcaps:<audioconvert0> transform could not transform audio/x-raw, format=(string)S16LE, layout=(string)interleaved, channels=(int)2, channel-mask=(bitmask)0x0000000000000003, rate=(int)44100 in anything we support
basetransform gstbasetransform.c:1414:gst_base_transform_setcaps:<audioconvert0> transform could not transform audio/x-raw, format=(string)S16LE, layout=(string)interleaved, channels=(int)2, channel-mask=(bitmask)0x0000000000000003, rate=(int)44100 in anything we support
basetransform gstbasetransform.c:1414:gst_base_transform_setcaps:<audioconvert0> transform could not transform audio/x-raw, format=(string)S16LE, layout=(string)interleaved, channels=(int)2, channel-mask=(bitmask)0x0000000000000003, rate=(int)44100 in anything we support
wavparse gstwavparse.c:2249:gst_wavparse_loop:<wavparse0> error: Internal data flow error.
wavparse gstwavparse.c:2249:gst_wavparse_loop:<wavparse0> error: streaming task paused, reason not-negotiated (-4)
basetransform gstbasetransform.c:1414:gst_base_transform_setcaps:<audioconvert0> transform could not transform audio/x-raw, format=(string)S16LE, layout=(string)interleaved, channels=(int)2, channel-mask=(bitmask)0x0000000000000003, rate=(int)44100 in anything we support
ERROR: from element /GstPipeline:pipeline0/GstWavParse:wavparse0: Internal data flow error.
I do get sound from both of the following
gst123 -a alsa=hw:2 temp.wav
aplay -D hw:2 temp.wav
Am I missing some additional arguments to gst-launch?
Any help would be much appreciated!
While writing up the question I found the answer, but I figured I'd go ahead and post the question in case anyone else ever encounters the same. There was indeed a missing argument... audioresample.
gst-launch-1.0 filesrc location=temp.wav ! wavparse ! audioconvert ! audioresample ! alsasink device=hw:2