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

1 files changed, 7 insertions, 0 deletions

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);