Amiga 030 can play MP3 and even with Internet radio

[SKOLMAN_MWS]

Originally Posted by nikosidis

Songplayer using Paula 14 bit directly, no AHI.

In your last film I see version 1.62, this version always uses AHI and all versions in 15KHz modes (PAL and NTSC) automatically downsampling half the frequency eg. 48k>24k. AHI has very poor resampling quality there is a little worse sound quality and there is more system slowdown. I recommend SongPlayer 1.53 (not newer) with AHI turned OFF. Newer versions of SongPlayer always use AHI. https://eab.abime.net/attachment.php...6&d=1480959305

youtube.com/watch?v=eWYaBq8FXQw

[jizmo]

Originally Posted by meynaf

After optimization of mpega.library i could play even 320kbps with quality set to high on my B1230. Ok, mono 22khz and not too much multitasking. But no stutter with DT2's mpega player and it starts immediately.

Then this sounds like a pretty vast improvement to the performance mpega.library offered before.

What did you do exactly to achieve this? I was always in the belief mpega utilised standard decoders that offer little headroom for any sort of optimisation.

[SKOLMAN_MWS]

@jizmo

mpega.library faster than itself

[nikosidis]

Originally Posted by SKOLMAN_MWS

In your last film I see version 1.62, this version always uses AHI and all versions in 15KHz modes (PAL and NTSC) automatically downsampling half the frequency eg. 48k>24k. AHI has very poor resampling quality there is a little worse sound quality and there is more system slowdown. I recommend SongPlayer 1.53 (not newer) with AHI turned OFF. Newer versions of SongPlayer always use AHI. https://eab.abime.net/attachment.php...6&d=1480959305

youtube.com/watch?v=eWYaBq8FXQw

Ah, thank you for the info I will try that.

[nikosidis]

Can someone put songplayer 1.53 in the zone?
Can not find it. Thx

[meynaf]

Originally Posted by jizmo

What did you do exactly to achieve this? I was always in the belief mpega utilised standard decoders that offer little headroom for any sort of optimisation.

This is code optimisation instead of algorithmic optimisation.
Rewriting the huffman decoder in asm made it a lot less sensitive to bitrate.
Some significant time could also be obtained by avoiding multiplies, which are slow on 030.

[SKOLMAN_MWS]

Originally Posted by nikosidis

Can someone put songplayer 1.53 in the zone?
Can not find it. Thx

SongPlayer-1.53.lha download

[nikosidis]

Skolman_Mws:

Thank you man. That is freaking sick quality I ran DblPAL and did not touch anything in the mixer it was just perfect CD quality.
We must upload this version to Aminet for others to enjoy with a ReadMe. I will for sure make video.

[gimbal]

That goes to show how far these routines have been optimised over the years. The first computer I played an MP3 on was a Pentium 120 through a very old version of Winamp. It worked... but it took a large chunk of the CPU

[Misclegend]

Originally Posted by meynaf

The settings in the video show 22050 frequency limit and mono output.

ah ok I imagined, 22050+stereo is only for the 040

btw, there is a fast mp3 player for mac which you can run in fusion/shapeshifter it could be faster than your mpeg library
I calculated can play mp3 files in a 030/50 at 22050 stereo
but I'm not really sure because I don't have a 030 right now to test

if anyone want to test

[patrik]

This version makes a really big difference at lowest settings.

Stefane TAVENARD's version:

7.Ram Disk:> copy temp:mpega_library/libs/mpega020.library libs:mpega.library
7.Ram Disk:> avail flush >nil: 
7.Ram Disk:> version mpega.library full 
mpega.library 2.4 (1999-09-13)
[68020/30] MPEG Audio decoding library (C)1997-1999 Stephane TAVENARD
7.Ram Disk:> mpega -d 4 -q 0 -m -n -s -D -u ram:shortsong.mp3 nil: 
MPEGA 3.5 (21.12.98) [Generic] (C)1995-1998 Stephane TAVENARD
Email: Stephane.Tavenard@wanadoo.fr
Giftware MPEG Audio decoder for Layers I,II and III

      Output: PCM file, low quality, mono 11025Hz
   File Type: MPEG1-III j-stereo 160kbps 44100Hz
 File length: 00:40
46.80 sec(s)

Meynaf's version:

7.Ram Disk:> copy temp:mpega030/mpega.library libs:mpega.library 
7.Ram Disk:> avail flush >nil: 
7.Ram Disk:> version mpega.library full 
mpega.library 2.0 (2008-08-27)
[68020/30]
7.Ram Disk:> mpega -d 4 -q 0 -m -n -s -D -u ram:shortsong.mp3 nil: 
MPEGA 3.5 (21.12.98) [Generic] (C)1995-1998 Stephane TAVENARD
Email: Stephane.Tavenard@wanadoo.fr
Giftware MPEG Audio decoder for Layers I,II and III

      Output: PCM file, low quality, mono 11025Hz
   File Type: MPEG1-III j-stereo 160kbps 44100Hz
 File length: 00:40
32.20 sec(s)

45% faster!

This on an A3000 030@25MHz and as you can see, meynaf's version makes it possible to play the song and even have some leftover cpu!