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| author | Martijn van Beurden <mvanb1@gmail.com> | 2022-05-21 20:06:57 +0200 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2022-05-21 20:06:57 +0200 |
| commit | f44d5967fd6779c079a60366c36dfa57b94d296f (patch) | |
| tree | f7bd817dac0b5e518c8edf3dbe38f0a7571fe9f1 /src | |
| parent | bcb7ed12b9d241f882302d38cbd7f5c821112734 (diff) | |
| download | flac-f44d5967fd6779c079a60366c36dfa57b94d296f.tar.gz | |
Fix compression of loose mid-side for certain kinds of music
The loose mid-side option only fully evaluates stereo decorrelation
once every few frames. However, in case of finding left-side or
right-side to be the best option, subsequent frames were coded
mid-side, which could be worse off. To not complicate code too much
(to make it possible to evaluate only left or right and side frame
for example), evaluation of left-side and right-side is completely
disabled when loose mid-side is enabled.
Diffstat (limited to 'src')
| -rw-r--r-- | src/libFLAC/stream_encoder.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/libFLAC/stream_encoder.c b/src/libFLAC/stream_encoder.c index d515f966..1fcb22ba 100644 --- a/src/libFLAC/stream_encoder.c +++ b/src/libFLAC/stream_encoder.c @@ -3350,7 +3350,11 @@ FLAC__bool process_subframes_(FLAC__StreamEncoder *encoder) channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT; min_bits = bits[channel_assignment]; - for(ca = 1; ca <= 3; ca++) { + + /* When doing loose mid-side stereo, ignore left-side + * and right-side options */ + ca = encoder->protected_->loose_mid_side_stereo ? 3 : 1; + for( ; ca <= 3; ca++) { if(bits[ca] < min_bits) { min_bits = bits[ca]; channel_assignment = (FLAC__ChannelAssignment)ca; |