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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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7
apps/plugins/mpegplayer/audio_thread.c
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@ -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);