LadybirdBrowser/ladybird
1
1
Fork 0
mirror of https://github.com/LadybirdBrowser/ladybird.git synced 2024-11-10 13:00:29 +03:00
Code Issues Packages Projects Releases Wiki Activity

LibAudio: Rescale integer samples correctly in FLAC loader

Browse Source 
The FLAC samples are signed, so we need to rescale them not by their bit
depth, but by half of the bit depth. For example, a 24-bit sample
extends from -2^23 to 2^23-1, and therefore needs to be rescaled by 2^23
to conform to the [-1, 1] double sample range.
This commit is contained in:
kleines Filmröllchen 2021-08-16 22:01:26 +02:00 committed by Andreas Kling
parent 442aa48a61
commit c974be91ab
Notes: sideshowbarker 2024-07-18 05:37:29 +09:00 
Author: https://github.com/kleinesfilmroellchen
Commit: https://github.com/SerenityOS/serenity/commit/c974be91abe
Pull-request: https://github.com/SerenityOS/serenity/pull/9461
1 changed files with 1 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Userland/Libraries/LibAudio/FlacLoader.cpp
View File

@ -414,8 +414,7 @@ void FlacLoaderPlugin::next_frame()
VERIFY(left.size() == right.size());
// TODO: find the correct rescale offset
double sample_rescale = static_cast<double>(1 << pcm_bits_per_sample(m_current_frame->bit_depth));
double sample_rescale = static_cast<double>(1 << (pcm_bits_per_sample(m_current_frame->bit_depth) - 1));
dbgln_if(AFLACLOADER_DEBUG, "Sample rescaled from {} bits: factor {:.1f}", pcm_bits_per_sample(m_current_frame->bit_depth), sample_rescale);
m_current_frame_data.clear_with_capacity();