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| author | Alessandro Ghedini <alessandro@ghedini.me> | 2014-04-04 11:50:44 +0200 |
|---|---|---|
| committer | Anton Khirnov <anton@khirnov.net> | 2014-04-04 17:40:19 +0200 |
| commit | 8542f9c4f17125d483c40c0c5723842f1c982f81 (patch) | |
| tree | 3981a5b0ca00cd6e3d3f47725dc7e3ff1050c9bd /doc/APIchanges | |
| parent | 25b6837f7cacd691b19cbc12b9dad1ce84a318a1 (diff) | |
| download | ffmpeg-8542f9c4f17125d483c40c0c5723842f1c982f81.tar.gz | |
replaygain: correctly parse peak values
According to the ReplayGain spec, the peak amplitude may overflow and may result
in peak amplitude values greater than 1.0 with psychoacoustically coded audio,
such as MP3. Fully compliant decoders must allow peak overflows.
Additionally, having peak values in the 0<->UINT32_MAX scale makes it more
difficult for applications to actually use the peak values (e.g. when
implementing clipping prevention) since values have to be rescaled down.
This patch corrects the peak parsing by removing the rescaling of the decoded
values between 0 and UINT32_MAX and the 1.0 upper limit.
Signed-off-by: Anton Khirnov <anton@khirnov.net>
Diffstat (limited to 'doc/APIchanges')
| -rw-r--r-- | doc/APIchanges | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/doc/APIchanges b/doc/APIchanges index 992a3b06e8..26271c86da 100644 --- a/doc/APIchanges +++ b/doc/APIchanges @@ -13,6 +13,10 @@ libavutil: 2013-12-xx API changes, most recent first: +2014-04-xx - xxxxxxx - lavu 53.10.0 - replaygain.h + Full scale for peak values is now 100000 (instead of UINT32_MAX) and values + may overflow. + 2014-04-xx - xxxxxxx - lavu 53.09.0 - log.h Add AV_LOG(c) macro to have 256 color debug messages. |