Rockbox open source high quality audio player as a Music Player Daemon
mpris
rockbox
mpd
libadwaita
audio
rust
zig
deno
Solve possible glitch after seeking in mpc files. Documented the special treatment after seek.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17829 a1c6a512-1295-4272-9138-f99709370657
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-3
+8
apps/codecs/libmusepack/decoder.h
+8
apps/codecs/libmusepack/decoder.h
···
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#include "reader.h"
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#include "streaminfo.h"
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// define this to enable/disable support for streamversion SV4-6
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//#define MPC_SUPPORT_SV456
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// SCF_HACK is used to avoid possible distortion after seeking with mpc files
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// background: scf's are coded differential in time domain. if you seek to the
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// desired postion it might happen that the baseline is missed and the resulting
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// scf is much too high (hissing noise). this hack uses the lowest scaling until
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// a non-differential scf could be decoded after seek. through this hack subbands
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// are faded out until there was at least a single non-differential scf found.
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#define SCF_HACK
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enum {
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-3
apps/codecs/libmusepack/mpc_decoder.c
+3
-3
apps/codecs/libmusepack/mpc_decoder.c
···
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#endif
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#ifdef SCF_HACK
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-
#define SCF_DIFF(SCF, D) (SCF == -128 ? -128 : SCF + D)
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#define SCF_DIFF(SCF, D) (SCF == 127 ? 127 : SCF + D)
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#else
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#define SCF_DIFF(SCF, D) SCF + D
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#endif
···
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memset(d->Y_L , 0, sizeof Y_L );
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memset(d->Y_R , 0, sizeof Y_R );
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#ifdef SCF_HACK
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-
memset(d->SCF_Index_L , -128, sizeof d->SCF_Index_L );
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memset(d->SCF_Index_R , -128, sizeof d->SCF_Index_R );
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memset(d->SCF_Index_L , 127, sizeof d->SCF_Index_L );
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memset(d->SCF_Index_R , 127, sizeof d->SCF_Index_R );
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#else
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memset(d->SCF_Index_L , 0, sizeof d->SCF_Index_L );
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memset(d->SCF_Index_R , 0, sizeof d->SCF_Index_R );