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Commit FS#9318 - MP3 synthesis filter on COP. Loads the MP3 synth filer on to the CoProcessor on all PortalPlayer devices, resulting in an ~90% speedup according to test_codec on the Sansa. Real world improvement is somewhat less, but still considerable. Allows MP3 decoding at 30MHz without boosting, or use of more DSP/EQ with less boosting/skipping, thus improving battery life. Minor changes to mpegplayer to retain compatibility with libmad changes. Should be no significant changes for other targets or codecs.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18557 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Giacomelli 2008-09-20 22:06:12 +00:00
parent 3d0d6d6bb2
commit 4e36a2b991
9 changed files with 180 additions and 32 deletions
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13
apps/codecs/libmad/frame.h
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@ -65,12 +65,15 @@ struct mad_header {
};
struct mad_frame {
struct mad_header header; /* MPEG audio header */
struct mad_header header; /* MPEG audio header */
int options; /* decoding options (from stream) */
int options; /* decoding options (from stream) */
mad_fixed_t sbsample[2][36][32]; /* synthesis subband filter samples */
mad_fixed_t (*overlap)[2][32][18]; /* Layer III block overlap data */
mad_fixed_t (*sbsample)[2][36][32]; /* synthesis subband filter samples */
mad_fixed_t (*sbsample_prev)[2][36][32]; /* synthesis subband filter samples
from previous frame only needed
when synthesis is on cop */
mad_fixed_t (*overlap)[2][32][18]; /* Layer III block overlap data */
};
# define MAD_NCHANNELS(header) ((header)->mode ? 2 : 1)