Unable to stream 16bit wav file to speaker

Thu Dec 8 14:48:07 UTC 2016

On 12/08/2016 03:12 PM, Stefan Sauer wrote:
> On 12/05/2016 05:26 PM, Walter Lucetti wrote:
>> Hi Stefan,
>>
>> the file is generated by a text-to-speech application and on VLC the
>> properties are correct:
>> PCM S16LE
>> Mono
>> 22050Hz
>> 16 bit
>>
>> You can check it downloading from here:
>> https://www.dropbox.com/s/j68n82e04j4ljjy/00000002.wav?dl=0
>>
>> Thank you for your help
>> Walter
>>
> I can confirm, that the file is not handled porperly and sounds
> distorted. Will fix it.
>
> Stefan
Actually the file is broken. These are the header parameters:
blockalign = 1
width      = 8
depth      = 16
av_bps     = 22050
frequency  = 22050
channels   = 1
bytes_per_sample = 1
bps        = 22050
caps = audio/x-raw, format=(string)U8, layout=(string)interleaved,
channels=(int)1, rate=(int)22050

From various places you can check the wav format spec:
http://soundfile.sapp.org/doc/WaveFormat/
BlockAlign       == NumChannels * BitsPerSample/8
                               The number of bytes for one sample including
                               all channels.

The issue is that blockalign=1, but for 16bit, it must be >= 2. We can
probably add a workaround, not sure what others think. If you can please
also report to the software that created the file.

Stefan

>
>>
>> 2016-12-05 16:58 GMT+01:00 Stefan Sauer <ensonic at hora-obscura.de
>> <mailto:ensonic at hora-obscura.de>>:
>>
>>     On 12/05/2016 02:53 PM, Walter Lucetti wrote:
>>>     Hi all,
>>>
>>>     I have a problem with GStreamer 1.9.90 and a 16bit PCM mono
>>>     channel wave file to be played.
>>>
>>>     I'm using this very simple pipeline that works very well with
>>>     8bit file:
>>>
>>>     gst-launch-1.0.exe filesrc
>>>     location="C:/Users/walter/Desktop/00000002.wav" ! decodebin !
>>>     audioresample ! audioconvert ! autoaudiosink -v -e
>>>
>>>     With 16 bit file (S16LE to be precise) the output is a long noise.
>>>
>>>     this is the output I obtain with "-v" option... I notice that
>>>     recognized format il "8U", but I'm not able to force it to 16bit
>>>     anyway:
>>>
>>>     Pipeline is PREROLLING ...
>>>     /GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstTypeFindElement:typefind.GstPad:src:
>>>     caps = audio/x-wav
>>>     /GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstTypeFindElement:typefind.GstPad:src:
>>>     caps = NULL
>>>     /GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstWavParse:wavparse0.GstPad:src:
>>>     caps = audio/x-raw, format=(string)U8,
>>>     layout=(string)interleaved, channels=(int)1, rate=(int)22050
>>
>>     Are you sure the 16bit wav file is well formed? According to the
>>     output gstreamer plays it as 8bit, which explains the noise. Can
>>     you share this file?
>>
>>     Stefan
>>
>>>     /GstPipeline:pipeline0/GstAudioResample:audioresample0.GstPad:src:
>>>     caps = audio/x-raw, format=(string)U8,
>>>     layout=(string)interleaved, channels=(int)1, rate=(int)22050
>>>     /GstPipeline:pipeline0/GstAudioConvert:audioconvert0.GstPad:src:
>>>     caps = audio/x-raw, format=(string)U8,
>>>     layout=(string)interleaved, channels=(int)1, rate=(int)22050
>>>     /GstPipeline:pipeline0/GstAutoAudioSink:autoaudiosink0.GstGhostPad:sink.GstProxyPad:proxypad1:
>>>     caps = audio/x-raw, format=(string)U8,
>>>     layout=(string)interleaved, channels=(int)1, rate=(int)22050
>>>     Redistribute latency...
>>>     /GstPipeline:pipeline0/GstAutoAudioSink:autoaudiosink0/GstDirectSoundSink:autoaudiosink0-actual-sink-directsound.GstPad:sink:
>>>     caps = audio/x-raw, format=(string)U8,
>>>     layout=(string)interleaved, channels=(int)1, rate=(int)22050
>>>     /GstPipeline:pipeline0/GstAutoAudioSink:autoaudiosink0.GstGhostPad:sink:
>>>     caps = audio/x-raw, format=(string)U8,
>>>     layout=(string)interleaved, channels=(int)1, rate=(int)22050
>>>     /GstPipeline:pipeline0/GstAudioConvert:audioconvert0.GstPad:sink:
>>>     caps = audio/x-raw, format=(string)U8,
>>>     layout=(string)interleaved, channels=(int)1, rate=(int)22050
>>>     /GstPipeline:pipeline0/GstAudioResample:audioresample0.GstPad:sink:
>>>     caps = audio/x-raw, format=(string)U8,
>>>     layout=(string)interleaved, channels=(int)1, rate=(int)22050
>>>     /GstPipeline:pipeline0/GstDecodeBin:decodebin0.GstDecodePad:src_0.GstProxyPad:proxypad2:
>>>     caps = audio/x-raw, format=(string)U8,
>>>     layout=(string)interleaved, channels=(int)1, rate=(int)22050
>>>     Pipeline is PREROLLED ...
>>>     Setting pipeline to PLAYING ...
>>>     New clock: GstAudioSinkClock
>>>     handling interrupt.
>>>     Interrupt: Stopping pipeline ...
>>>     EOS on shutdown enabled -- Forcing EOS on the pipeline
>>>     Waiting for EOS...
>>>     Got EOS from element "pipeline0".
>>>     EOS received - stopping pipeline...
>>>     Execution ended after 0:00:03.745515003
>>>     Setting pipeline to PAUSED ...
>>>     Setting pipeline to READY ...
>>>     Setting pipeline to NULL ...
>>>     Freeing pipeline ...
>>>
>>>
>>>     Thank you for help
>>>     Walter
>>>
>>>     -- 
>>>     *Walter Lucetti*
>>>
>>>     email: myzhar at gmail.com <mailto:myzhar at gmail.com>
>>>     web: /www.robot-home.it <http://www.robot-home.it/>/
>>>     project:  http://myzharbot.robot-home.it
>>>     <http://myzharbot.robot-home.it>
>>>
>>>
>>>
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>>
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>>
>> -- 
>> *Walter Lucetti* email: myzhar at gmail.com <mailto:myzhar at gmail.com>
>> web: /www.robot-home.it <http://www.robot-home.it/>/
>> project:  http://myzharbot.robot-home.it
>>
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>
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