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skip junk in mp3_helix, refactor find_sync_word

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@889 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2010-09-08 20:52:13 +00:00
parent cf82669f50
commit 7c18e34a74
13 changed files with 86 additions and 82 deletions
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29
platform/gp2x/code940/940.c
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@ -2,6 +2,7 @@
// (c) Copyright 2006-2007, Grazvydas "notaz" Ignotas
#include "940shared.h"
#include "../../common/mp3.h"
static _940_data_t *shared_data = (_940_data_t *) 0x00100000;
static _940_ctl_t *shared_ctl = (_940_ctl_t *) 0x00200000;
@ -25,32 +26,6 @@ void _memcpy(void *dst, const void *src, int count);
// asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer */
static int find_sync_word(unsigned char *buf, int nBytes)
{
unsigned char *p, *pe;
/* find byte-aligned syncword - need 12 (MPEG 1,2) or 11 (MPEG 2.5) matching bits */
for (p = buf, pe = buf + nBytes - 4; p < pe; p++)
{
int pn;
if (p[0] != 0xff) continue;
pn = p[1];
if ((pn & 0xf8) != 0xf8 || // currently must be MPEG1
(pn & 6) == 0) { // invalid layer
p++; continue;
}
pn = p[2];
if ((pn & 0xf0) < 0x20 || (pn & 0xf0) == 0xf0 || // bitrates
(pn & 0x0c) != 0) { // not 44kHz
continue;
}
return p - buf;
}
return -1;
}
static void mp3_decode(void)
{
int mp3_offs = shared_ctl->mp3_offs;
@ -63,7 +38,7 @@ static void mp3_decode(void)
for (retries = 0; retries < 2; retries++)
{
offset = find_sync_word(readPtr, bytesLeft);
offset = mp3_find_sync_word(readPtr, bytesLeft);
if (offset < 0)
goto set_eof;