Re: lame main branch

Am Tue, 22 Aug 2017 19:30:33 +0200
schrieb Thomas Orgis <[email protected]>: 

> Well, my plan is this: I'll see what I can come up with until
> (including) Thursday. 

I got a sketchy build of lame from CVS with libmpg123 (verboseness
active with the Note: lines):

$ frontend/lame /projects/mpg123/svn/test/regression/drum.mp3 drum-anew.mp3
Note: Disabling all formats.
Note: Want to enable format 0/3 for encodings 0xd0.
Note: ID3v2.3 rev 0 tag of 1558 bytes
Note: ID3v2 COMM frame of size 60
Note: Storing comment from Latin 1 encoding
Note: ID3 comm/uslt desc of length 11.
Note: ID3 comm/uslt text of length 47.
Note: ID3v2 TIT2 frame of size 24
Note: Storing text from Latin 1 encoding
Note: ID3v2 TIT2 text frame: Test track (some drums)
Note: ID3v2 TPE1 frame of size 13
Note: Storing text from Latin 1 encoding
Note: ID3v2 TPE1 text frame: Thomas Orgis
Note: ID3v2 TYER frame of size 5
Note: Storing text from Latin 1 encoding
Note: ID3v2 TYER text frame: 2010
Note: ID3v2 TALB frame of size 22
Note: Storing text from Latin 1 encoding
Note: ID3v2 TALB text frame: The mpg123 Repository
Note: ID3v2 TRCK frame of size 4
Note: Storing text from Latin 1 encoding
Note: ID3v2 TRCK text frame: 1/1
Note: ID3v2 TCON frame of size 5
Note: Storing text from Latin 1 encoding
Note: ID3v2 TCON text frame: (33)
Note: Xing/Lame/Info header detected
Note: Xing: 1247 frames
Note: Xing: 860640 bytes
Note: Xing: quality = 77
Note: Info: Encoder: LAME3.98r
Note: Info: rev 11
Note: Info: vbr mode 3
Note: Info: peak = 0.000000 (I won't use this)
Note: Info: Radio Gain = -9.8dB
Note: Info: Audiophile Gain = 0.0dB
Note: Encoder delay = 576; padding = 1344
LAME 3.100 (beta 0, Aug 24 2017) 64bits (http://lame.sf.net)
Using polyphase lowpass filter, transition band: 16452 Hz - 17032 Hz
Encoding /data/projekte/mpg123/svn/test/regression/drum.mp3 to drum-anew.mp3
Encoding as 48 kHz j-stereo MPEG-1 Layer III (12x) 128 kbps qval=3

Note: Cut frame 0 buffer on beginning of stream by 1105 samples, fill now 188 bytes.
    Frame          |  CPU time/estim | REAL time/estim | play/CPU |    ETA 
  1200/1247   (96%)|    0:00/    0:00|    0:00/    0:00|   38.687x|    0:00 
-----------------------------------------------------------------------------------------------00:01---
   kbps        LR    MS  %     long switch short %
  1247/1247  (100%)|    0:00/    0:00|    0:00/    0:00|   38.450x|    0:00 
-------------------------------------------------------------------------------------------------------
   kbps        LR    MS  %     long switch short %
  128.0       40.7  59.3        95.2   2.9   1.9
Writing LAME Tag...done
ReplayGain: -9.4dB

This is currently an experimental mpg123 build because I presume I need
to add those hooks for lame to extract the raw ID3v2 data (any further
parsing of that?). It wants to put that into the re-encoded file,
right? Sorry for being a bit incoherent … it's my state of mind trying
to navigate the lame sources.

I guess I could get that into shape. But it dawns on me that this is
only a small part of the work. So far I got the frontend using
libmpg123, but libmp3lame is a whole different thing, isn't it? It has
another interface for the mpglib? How many entry points are there? A
list of files that need hooks replaced would be nice. Also which
configure variables I need to set to slip libmpg123 linking into
libmp3lame … of course I could find out this stuff myself with frantic
searching, but since the project is so alive right now, the answer
might be easily given.

Also I would like to switch on floating point output from libmpg123. Is
there any place in lame that actually wants clipped 16 bit samples?


Alrighty then,

Thomas

PS: How serious are you about cutting decoder delay from mp1 and mp2? I
left that alone in mpg123 as I don't have any encoder padding values
anyway. I only added gapless decoding for mp3, where it has a chance to
work.
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