Sorry for sending a HTML-mail, I had not thought about the effect that
would have when presented in the list.
So this one as a plain text one.
Hi to all
Today Max Kellerman confirmed to me that mpd is capable of sending
24-bit audio output in true 3-byte sample format (so not the padded 4
byte samples) without the use of ALSA to do any conversions.
As far as I understand it, this native mpd-support for 3-byte samples is
for the S24_3LE format.
I got his answer as a reply to my request to support true 3-byte sample
output I posted on the Mantis bugtracker.
Max replied he did not find Mantis suitable to ask questions, so I still
have a question remaining I wish to post to you here.
How do I configure mpd to make it send 24-bit audio as true 3-byte
samples without using ALSA?
I could not find any examples on the mpd-wiki configuration page. I
assume that mpd is also still capable of sending the 32-bit samples with
the 24-bit audio padded with zeroes. This would mean there has to be a
switch/parameter indicating that a 24-bit sample size is wanted instead
of 32-bit, but I don't know which one that would be.
The audio_output section of the mpd.config now looks like this:
audio_output {
type "smp86xx"
load "/share/Apps/mpd/plugins/smp86xx_plugin.so"
name "My Sigma Chip"
engine "0" # optional
decoder "1" # optional
ramdac "1" # optional
line_count "2048" # optional
fifo_us "500000" # optional
hdmi "sii9134"
}
This belongs to mpd as implemented on the PopcornHour mediaplayer with a
plugin developed to send the mpd-output straight into the Sigma Design
SMP86xx processor. As you can see ALSA is not used here as the output is
sent directly to the processor.
This processor requires 24-bit audio to be sent in true unpacked 3 bytes
per sample little endian format, as S24_3LE would be as I understand it,
or in a DVD PCM 24-bit linear PCM as described here (
http://wiki.multimedia.cx/index.php?title=PCM#24-Bit_PCM ) which is
somewhat more difficult to implement and also limited to 96kHz sample rate.
But Max confirmed that 24-bit audio output in true 3-byte sample format
is available as a native format from mpd, so that would be the best one.
So can anyone instruct me how to make mpd output 24-bit audio as true
3-byte samples without the use of ALSA?
Eagerly looking forward to your reply
-
aleg
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