From 4e36a2b991d58a40d7ea12c9bf41e93736b8b024 Mon Sep 17 00:00:00 2001
From: Michael Giacomelli <giac2000@hotmail.com>
Date: Sat, 20 Sep 2008 22:06:12 +0000
Subject: 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.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18557 a1c6a512-1295-4272-9138-f99709370657
---
 apps/plugins/mpegplayer/Makefile       | 2 +-
 apps/plugins/mpegplayer/audio_thread.c | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

(limited to 'apps/plugins')

diff --git a/apps/plugins/mpegplayer/Makefile b/apps/plugins/mpegplayer/Makefile
index 66a6142..7f90cbc 100644
--- a/apps/plugins/mpegplayer/Makefile
+++ b/apps/plugins/mpegplayer/Makefile
@@ -10,7 +10,7 @@
 INCLUDES = -I$(APPSDIR) -I.. -I. $(TARGET_INC) -I$(FIRMDIR)/include -I$(FIRMDIR)/export \
  -I$(FIRMDIR)/common -I$(FIRMDIR)/drivers -I$(APPSDIR)/plugins/lib -I$(OUTDIR) -I$(BUILDDIR)
 CFLAGS = $(INCLUDES) $(GCCOPTS) -O2 $(TARGET) $(EXTRA_DEFINES) \
- -DTARGET_ID=$(TARGET_ID) -DMEM=${MEMORYSIZE} -DPLUGIN
+ -DTARGET_ID=$(TARGET_ID) -DMEM=${MEMORYSIZE} -DPLUGIN -DMPEGPLAYER
 
 ifdef APPEXTRA
    INCLUDES += $(patsubst %,-I$(APPSDIR)/%,$(subst :, ,$(APPEXTRA)))
diff --git a/apps/plugins/mpegplayer/audio_thread.c b/apps/plugins/mpegplayer/audio_thread.c
index 838dcad..3515815 100644
--- a/apps/plugins/mpegplayer/audio_thread.c
+++ b/apps/plugins/mpegplayer/audio_thread.c
@@ -55,6 +55,9 @@ static struct mad_stream stream IBSS_ATTR;
 static struct mad_frame  frame IBSS_ATTR;
 static struct mad_synth  synth IBSS_ATTR;
 
+/*sbsample buffer for mad_frame*/
+mad_fixed_t sbsample[2][36][32];
+
 /* 2567 bytes */
 static unsigned char mad_main_data[MAD_BUFFER_MDLEN];
 
@@ -229,6 +232,10 @@ static int audio_buffer(struct stream *str, enum stream_parse_mode type)
 /* Initialise libmad */
 static void init_mad(void)
 {
+    /*init the sbsample buffer*/
+    frame.sbsample = &sbsample;
+    frame.sbsample_prev = &sbsample;
+    
     mad_stream_init(&stream);
     mad_frame_init(&frame);
     mad_synth_init(&synth);
-- 
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