Unable to stream 16bit wav file to speaker

Thu Dec 8 21:51:15 UTC 2016

Thank you Stefan,

The file has been generated by the a software written by a colleague of
mine. He told me that he found one problem in the header, but Monday (4
days of holydays here in Italy) I will say to him that the problems were
two.

Thank you very much for the help

Regards
Walter

-- 
Walter Lucetti

email: myzhar at gmail.com
web: www.robot-home.it - www.opencv.it
project:  http://myzharbot.robot-home.it

Il 08 Dic 2016 15:50, "Stefan Sauer" <ensonic at hora-obscura.de> ha scritto:

On 12/08/2016 03:48 PM, Stefan Sauer wrote:

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

Oh, and also the avg_bps is wrong. Needs to be 44100 for 16bit.

Stefan

>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>:

> 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/GstDi
> rectSoundSink: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
> web: *www.robot-home.it <http://www.robot-home.it/>*
> project:  http://myzharbot.robot-home.it
>
>
>
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>
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-- 
*Walter Lucetti* email: myzhar at gmail.com web: *www.robot-home.it
<http://www.robot-home.it/>*
project:  http://myzharbot.robot-home.it

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