WavPlayback example will not recognize any wav files
Closed this issue · 8 comments
I wired up the I2S MAX08357 breakout board to the MKZero and uploaded the WavPlayback from the https://github.com/arduino-libraries/ArduinoSound library. But somehow nothing useful happens.
If I use a wav file I get this:
Initializing SD card...initialization done.
wave file is invalid!
Disabling this check sheds some light on the issue:
Initializing SD card...initialization done.
Bits per sample = -1
Channels = -1
Sample rate = -1 Hz
Duration = 1 seconds
unable to play wave file using I2S!
This was with a mono, 8bit/sample wav file. OK, I tried a 16 bit mono, at least this file makes some sense to the parser...?
Bits per sample = 16
Channels = 1
Sample rate = 22050 Hz
Duration = 0 seconds
unable to play wave file using I2S!
If I go on and disable the sanity check this one file plays, not very clean, but at least something is coming out which is remotely like the sound I expect.
16bit stereo is again not recognized by the sketch...
Initializing SD card...initialization done.
Bits per sample = -1
Channels = -1
Sample rate = -1 Hz
Duration = 1 seconds
unable to play wave file using I2S!
To aggravate the problems, some 16bit/22050s/s/mono files will play, but not all of them, I cannot see the difference.
Any idea what do I do wrong?
Hi @Protonerd,
To aggravate the problems, some 16bit/22050s/s/mono files will play, but not all of them, I cannot see the difference.
Any idea what do I do wrong?
At this time only stereo wave files are supported.
If you are still having issues, please attach the stereo wave files you're having issues with as a comment.
Hi Sandeep, thanks for looking into this topic, I will attach example wav files as soon as I get home to my own PC. Hopefully this can be resolved. Do you have plans to give support to mono as well?
Do you have plans to give support to mono as well?
There is nothing scheduled to support mono files at this time. There will also be a performance hit, because the mono file needs to be converted to stereo at runtime to be played out the I2S interface.
Hi Sandeep,
I attach one stereo wav file which refuses to play, I had to zip it with 7zip and rename the extension to zip otherwise GitHub will not accept it as attachment.
Thanks for looking into it, I really appreciate it!
Hi Sandeep, any luck debugging the problem? I'm stuck with my project until this issue is solved... I appreciated your feedback. Maybe you can also send me a known-good wav file which plays.
The wave file you provided has a Subchunk1Size value of 18, based on http://soundfile.sapp.org/doc/WaveFormat/ - 16 is expected for PCM.
I'll attach a known wave file shortly. Btw, the latest release of this library includes #7 which adds support for mono wave files.
I've converted the wave file you provided with Audacity:
h_16b-audacity.wav.zip
Thanks Sandeep. In the mean time I also found wav files which are played correctly. So it's probably a header issue. I will try the new mono support, thanks a lot for the heads up. I will close it for now. Good jobs, thanks a lot for the support.
BTW, cam you point me to the place I can change the sample rate? I would like to change the pitch of the playback