Thanks Clemens
Tan, Seng Kai wrote:
I am facing similar problem like this issue, hope to get your advice. http://mailman.alsa-project.org/pipermail/alsa-devel/2012-August/05424 1.html
And the answer is the same.
I try to turn on S24_LE support for HDMI Audio using below patch.
Your hardware does not support S24_LE. 24-bit samples use the S32_LE format (unless you have very exotic hardware, but HDA isn't).
We have another I2S hardware which is able to support S24L_LE and S32_LE format, when I use -Dplughw to play S24_3LE format the same things happen. It pad the 0 in MSB the whole data is shift to right and the audio volume is lower. Is this the problem for alsa plugins?
Back end S24_LE : 0x00123456(in 4bytes, MSB 0 padding)
This is how S24_LE works.
S24_LE in wav file supposed to be in format 0x00123456 ( 0 pad MSB) or 0x12345600 ( 0 pad LSB) which one is correct? I am a bit confuse here, because When I open file with 0x12345600 ( 0 pad LSB) using audacity, it is able to view the file But not for 0x00123456 ( 0 pad MSB).
Can you advice how to tell the alsa plugin to pad in LSB instead of MSB?
Use S32_LE.
Question: is all HDMI support 24 bit must have 32bit support? My concern is it don't And we want to maximize the quality to 24bit.
Regards, Seng Kai